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Andr, Ondřej. "Srovnání on-page SEO faktorů pro mobilní web." Master's thesis, Vysoká škola ekonomická v Praze, 2015. http://www.nusl.cz/ntk/nusl-204028.
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The thesis deals with a topic of SEO onpage signals, which are important for search engines because of sorting pages in a search engine result page. It focuses on importance of these signals for mobile SERP. Main goals of this study are to describe current recommendations for SEO on-page factors for mobile web and experimentally test real importance of these signals. Based on the results I composed an optimal set of factors with the most benefit for SEO. Theoretical part of the study summarizes basic facts about mobile searching, describes specific mobile users behaviour and describes current recommendations for mobile web onpage optimizing from Google and Seznam.cz. In practical part there is a comparative study of chosen on-page signals. For its needs I had to create few one page static websites. Each one has been optimized for on factor. All websites focused on the same very specific topic to ensure the same initial conditions. By keywords rank tracking in a SERP I was able to determine which signal is more important than others for search engines. The study results contribute to actual evaluation of each on-page signals importance for mobile website. The study could be beneficial for smaller companys websites, which need to get more visible on the net. They are able to optimize their costs by choosing the right set of on-page factors.
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Swenson, Johannes. "Webdesign och SEO i praktiken : Utvecklande av webbplats och optimering för sökmotorer åt ett företag." Thesis, Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-30435.
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This report describes my work with a website for a company that helps other companies book conferences. Creating this website, I have worked from a Mobile First perspective to create an interface. The interface was then tested on potential users. I then used guidelines from Googles own documentation on search engine optimization. The purpose of this work is to create and deliver a website where users can turn to MH Konferens and let them handle booking and planning of their conferences.Denna rapport beskriver arbetet med en webbplats för ett företag som jobbar med att boka konferenser åt andra företag. Jag har i framtagandet av webbplatsen utgått från Mobile First och skapat ett gränssnitt. Gränssnittet har sedan testats på användare och slutligen har jag utgått från Googles egen dokumentation för att optimera webbplatsen för sökmotorer. Syftet med arbetet är att skapa en webbplats som leder till att användare kan vända sig till MH konferens och låta dem ta hand om bokning och planering av deras konferenser.
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Bäcke, Louise, Ellinor Hansen, and Linnea Johansson. "Mobile Search : An empirical investigation of the next big thing." Thesis, Linnéuniversitetet, Ekonomihögskolan, ELNU, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-19290.
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The remarkable spread of the Internet has generated new opportunities for companies to promote themselves and communicate with their customers. The most used Internet service of finding information today is search engines (e.g. Google, Bing, Yahoo) were almost three million searches are preformed every minute worldwide. This trend has led to an importance for companies having their websites visible on these search engines. In addition, people tend to be more and more on the go and are searching with their smartphones instead of traditional personal computer (PC). Meaning that companies’ websites can be available for customers 24 hour a day, 7 days a week, independent on customers location. Consequently, companies have the possibilities to reach the attention of customers when they actually search for a product/service and are therefore most likely to purchase. In this thesis a marketing strategy has been developed for managers regarding how to master this new communication tool, in order to reach success and competitive advantage. This strategy was developed by investigate in what characteristics and functions users desire when searching with their smartphone. Together with three hypotheses tested if the perceived user-friendliness, relative advantage and compatibility within mobile search have a positive affect on the intention of use this new technology. In this bachelor thesis a survey was conducted among people in generation C living in Sweden, which resulted in 397 completed responses. The hypotheses were tested with use of a regression analysis and the findings were that the relative advantage and compatibility in mobile search has a positive affect on the intention of use. Therefore, this thesis suggests companies to develop their mobile search engine marketing strategy with the aim of delivering value and satisfying the customer. Moreover, this thesis recommend managers to keep their mobile website quick, relevant and making sure having valuable and informative information about their business in the description text visible to users in the search engine hit list. Finally, the majority of the population does already act on this new market and it is therefore of great importance for companies satisfying these users in order to stay competitive.
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Smolíková, Barbora. "Marketingová komunikace." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2017. http://www.nusl.cz/ntk/nusl-377616.
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Diploma thesis focus on optimization of online marketing communication of Reinto company. Based on these analyzes, it is proposed optimization of existing online marketing communications including budget, risk analysis, time schedule, RACI matrix and other recommendation.
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Drgonec, Igor. "Návrh marketingové strategie pro high-tech firmu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2016. http://www.nusl.cz/ntk/nusl-241470.
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Diploma’s thesis presents usage of marketing and subcategory online marketing to create basic steps or tutorial to start and to rise popularity of mobile applications developed by Programatori s.r.o. and publicity of company as well. In this thesis will be used especially tools of online marketing like social networks, and SEO optimization. These tools will be used during whole life cycle of mobile application.
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Boitnott, Brad P. "Maintaining high availability in distributed mobile systems." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FBoitnott.pdf.
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Thesis (M.S. in Computer Science)--Naval Postgraduate School, September 2009.Thesis Advisor(s): Singh, Gurminder ; Gibson, John H. "September 2009." Description based on title screen as viewed on November 05, 2009. Author(s) subject terms: High Availability, Failsafe, Fault-tolerant, Distributed Mobile System, TwiddleNet Includes bibliographical references (p. 53-55). Also available in print.
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McBride, Marlon Masacioglu Mustafa. "Control Based Mobile Ad Hoc Networking for survivable, dynamic, mobile Special Operation Force communications." Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FMcBride.pdf.
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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, September 2009.Thesis Advisor(s): Bordetsky, Alex. "September 2009." Description based on title screen as viewed on November 5, 2009. Author(s) subject terms: Control Based Mobile Ad Hoc Networking, CBMANET, MANET, Routing Protocol, Wireless Network Includes bibliographical references (p. 67-72). Also available in print.
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Lin, Tao. "Mobile Ad-hoc Network Routing Protocols: Methodologies and Applications." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/11127.
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A mobile ad hoc network (MANET) is a wireless network that uses multi-hop peerto- peer routing instead of static network infrastructure to provide network connectivity. MANETs have applications in rapidly deployed and dynamic military and civilian systems. The network topology in a MANET usually changes with time. Therefore, there are new challenges for routing protocols in MANETs since traditional routing protocols may not be suitable for MANETs. For example, some assumptions used by these protocols are not valid in MANETs or some protocols cannot efficiently handle topology changes.
Researchers are designing new MANET routing protocols and comparing and improving existing MANET routing protocols before any routing protocols are standardized using simulations. However, the simulation results from different research groups are not consistent with each other. This is because of a lack of consistency in MANET routing protocol models and application environments, including networking and user traffic profiles. Therefore, the simulation scenarios are not equitable for all protocols and conclusions cannot be generalized. Furthermore, it is difficult for one to choose a proper routing protocol for a given MANET application.
According to the aforementioned issues, my Ph.D. research focuses on MANET routing protocols. Specifically, my contributions include the characterization of differ- ent routing protocols using a novel systematic relay node set (RNS) framework, design of a new routing protocol for MANETs, a study of node mobility, including a quantitative study of link lifetime in a MANET and an adaptive interval scheme based on a novel neighbor stability criterion, improvements of a widely-used network simulator and corresponding protocol implementations, design and development of a novel emulation test bed, evaluation of MANET routing protocols through simulations, verification of our routing protocol using emulation, and development of guidelines for one to choose proper MANET routing protocols for particular MANET applications.
Our study shows that reactive protocols do not always have low control overhead, as people tend to think. The control overhead for reactive protocols is more sensitive to the traffic load, in terms of the number of traffic flows, and mobility, in terms of link connectivity change rates, than other protocols. Therefore, reactive protocols may only be suitable for MANETs with small number of traffic loads and small link connectivity change rates. We also demonstrated that it is feasible to maintain full network topology in a MANET with low control overhead. This dissertation summarizes all the aforementioned methodologies and corresponding applications we developed concerning MANET routing protocols.Ph. D.
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Atkinson, Ian Andrew. "Advanced linear predictive speech compression at 3.0 kbits/sec and below." Thesis, University of Surrey, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336527.
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Cao, Guangtong. "Distributed services for mobile ad hoc networks." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2541.
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A mobile ad hoc network consists of certain nodes that communicate only
through wireless medium and can move arbitrarily. The key feature of a mobile ad
hoc network is the mobility of the nodes. Because of the mobility, communication
links form and disappear as nodes come into and go out of each other's communica-
tion range. Mobile ad hoc networks are particularly useful in situations like disaster
recovery and search, military operations, etc. Research on mobile ad hoc networks
has drawn a huge amount of attention recently. The main challenges for mobile ad
hoc networks are the sparse resources and frequent mobility. Most of the research
work has been focused on the MAC and routing layer. In this work, we focus on
distributed services for mobile ad hoc networks. These services will provide some
fundamental functions in developing various applications for mobile ad hoc networks.
In particular, we focus on the clock synchronization, connected dominating set, and
k-mutual exclusion problems in mobile ad hoc networks.
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Oliveira, Luís Filipe Nunes Quaresma de. "Mobile robot navigation based on ad-hoc RF communication." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/2099.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesActualmente a utilização de redes de sensores sem fios, com nós quer estáticos quer moveis, é cada vez mais apelativa. Desde simples aplicações de monitorização, como por exemplo parâmetros ambientais, até aplicações complexas de busca e salvamento, a localização dos vários nós da rede é fundamental. No caso de mobilidade na rede acresce ainda a necessidade de uma capacidade de navegação eficiente. Dado o facto de que em muitas das aplicações de redes de sensores sem fios, como por exemplo operações de busca e salvamento em que o tempo de resposta tem de ser obrigatoriamente curto, é impossível fazer previamente o planeamento e a implementação de uma infra-estrutura, torna-se imprescindível a utilização de métodos de localização que não dependam de pontos conhecidos. No âmbito desta dissertação são estudadas técnicas de localização e navegação relativas, baseadas simplesmente no sinal RF das comunicações sem fios. Relativamente à localização foram realizados testes com diferentes parâmetros relacionados com as comunicações. Estes são importantes devido à necessidade de estudar o impacto destes factores no cálculo da topologia da rede. O trabalho desenvolvido relativamente à navegação foi avaliado experimentalmente, com incidência na avaliação comparativa dos diversos métodos propostos, i.e., um método oblívio baseado em direcções aleatórias e outro baseado na técnica MLE - Maximum Likelihood Estimator. Apresentam-se nesta dissertação os respectivos resultados que permitem verificar o melhor desempenho em convergência para o objectivo usando MLE à custa de maior custo computacional. Em particular, foi possível fazer um robô móvel percorrer um trajecto entre dois faróis de RF, navegando apenas com informação de RSS.
Nowadays the usage of wireless sensor networks, with either static or mobile nodes, has been an area of growing interest. From the simplest applications of monitoring, i.e. environmental parameters, to the most complex search and rescue applications, the localization of the various nodes of the network is fundamental. In the situation at which the network has mobility there is additionally a need of the ability to efficiently navigate. Due to the fact that in many of the applications, i.e. search and rescue situations where the time of action is critical, is impossible to perform a previous planning and building of a framework, anchor free relative localization methods become indispensable. In this dissertation several relative localization and navigation techniques, based only on the RF signal of the wireless communications, are studied. On the subject of localization, different parameters related with the communications were tested. These are significant because of the necessity of studying the impact of such factors in calculating the network topology. On the subject of navigation the resulting work was experimentally evaluated, with emphasis on the comparative evaluation of the several methods presented in this dissertation, namely a simple oblivious method based on random directions and another one based on MLE - Maximum Likelihood Estimator. The results show the superiority of MLE concerning the speed of getting to the target at the cost of extra computations. In particular, in the scope of this dissertation we have made a small autonomous robot move between to RF beacons, using RSS information, only.
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Kim, Kyoung Min Sun Min-Te. "Multi initiator connected dominating set construction for mobile ad hoc networks." Auburn, Ala, 2008. http://hdl.handle.net/10415/1549.
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Behrendt, Frauke. "Mobile sound : media art in hybrid spaces." Thesis, University of Sussex, 2010. http://sro.sussex.ac.uk/id/eprint/6336/.
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The thesis explores the relationships between sound and mobility through an examination of sound art. The research engages with the intersection of sound, mobility and art through original empirical work and theoretically through a critical engagement with sound studies. In dialogue with the work of De Certeau, Lefebvre, Huhtamo and Habermas in terms of the poetics of walking, rhythms, media archeology and questions of publicness, I understand sound art as an experimental mobile and public space. The thesis establishes and situates the emerging field of mobile sound art by mapping three key traditions of mobile sound art - locative art, sound art and public art - and creates a taxonomy of mobile sound art by defining four categories: 'placing sounds', 'sound platforms', 'sonifying mobility' and 'musical instruments' (each represented by one case study). In doing so it develops a methodology that is attentive to the specifics of the sonic and mobile of media experience. I demonstrate how sonic interactions and embodied mobility are designed and experienced in specific ways in each of the four case studies - 'Aura' by Symons (UK), 'Pophorns' by Torstensson and Sandelin (Sweden), 'SmSage' by Redfern and Borland (US) and 'Core Sample' by Rueb (US) (all 2007). In tracing the topos of the musical telephone, discussing the making and breaking of relevant micro publics, accounting for the polyphonies of footsteps and unwrapping bundles of rhythms, this thesis contributes to understanding complex media experiences in hybrid spaces. In doing so it critically sheds light on the quality of sonic artistic experiences, the audience engagement with urban, public and networked spaces and the relationship between sound art and everyday media experience. My thesis provides valuable insight into auditory ways of mobilising and making public spaces, non-verbal and embodied media practices, and rhythms and scales of mobile media experiences.
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Mercier, Coraline. "De nouveaux systèmes hôtes-virus associés aux sources hydrothermales océaniques profondes." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0125/document.
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Nos connaissances sur la diversité virale associée aux micro-organismes présents dans les sources hydrothermales océaniques profondes restent encore limitées. Seules quelques études concernant l’abondance virale et l’impact de ceux-ci sur la mortalité microbienne dans ces écosystèmes sont disponibles. En effet, seuls 6 bactériovirus et 2 archéovirus provenant de ces écosystèmes ont été caractérisés à l’heure actuelle. Les deux archéovirus infectent des archées anaérobies hyperthermophiles appartenant à l’ordre des Thermococcales et ont été décrits au laboratoire.Afin d’étendre nos connaissances sur la diversité virale associée aux micro-organismes colonisant ces environnements, il a été décidé d’élargir les recherches à l’ordre bactérien des Thermotogales. Cet ordre bactérien est composé de bactéries chimio-organotrophes anaérobies en majorité thermophiles ou hyperthermophiles. De nombreux transferts latéraux de gènes ont contribué à l’histoire évolutive des Thermotogales supposant une forte implication des virus dans celle-ci. Ces travaux de thèse ont permis la caractérisation fonctionnelle et génomique de deux nouveaux siphovirus, MCV1 et MCV2, infectant deux souches de Marinitoga camini. Ces souches ont été isolées de deux sites hydrothermaux profonds (Menez Gwen et Lucky Strike) au niveau de la dorsale médio-atlantique. Ces virus mettent en oeuvre un cycle lysogénique avec une production basale sans induction relativement haute (>107 virions/ml). Une comparaison de ces deux génomes viraux à celui de MPV1, virus précédemment isolé de Marinitoga piezophila, a été réalisée, révélant la présence de nombreuses similarités. Un core genome de 35 ORFs partagé par ces trois génomes a été identifié, incluant des protéines impliquées dans le métabolisme de l’ADN, l’assemblage des virions et le cycle lysogénique. Des protéines hypothétiques ont aussi été identifiées parmi ces gènes communs, elles portent donc probablement des fonctions importantes pour ces bactériovirus. Par ailleurs, 60% des gènes de ces virus ayant une correspondance dans les bases de données, après exclusion des Thermotogales, partagent des similarités avec lesFirmicutes et les bactériovirus qui leurs sont associés. Le génome d’une autre Thermotogales, Thermosipho sp. AT1244-VC14 a été étudié ainsi que son système CRISPR-cas. Ces résultats indiquent que cette souche, qui porte un système CRISPR-cas qui semble complet et fonctionnel, a probablement déjà été infectée par MCV1, MCV2 ou un virus similaire. Ces travaux permettent d’étendre nos connaissances sur les virus portés par les bactéries du phylum Thermotogae, encore peu décrits à ce jour. Les éléments génétiques mobiles associés à ce phylum sont particulièrement intéressants car ils ont probablement eu un impact important dans l’évolution de ces communautés microbiennes ainsi que dans leur adaptation aux conditions physico-chimiques extrêmes et fluctuantes présentes dans les écosystèmes qu’elles colonisentOur knowledge of the viral diversity associated to microorganisms inhabiting the deep-sea hydrothermal vents is still limited. Only a few studies have focused on viral abundance and impact on microbial mortality within these ecosystems. A limited number of viruses (6 bacterioviruses and 2 archaeoviruses) were isolated from these environments and characterized. Two viruses associated to hyperthermophilic anaerobic Archaea, from the Thermococcales order, have been described in our laboratory. In order to deepen our knowledge on the viral diversity of these extreme environments, we have extended our investigation to the bacterial order of Thermotogales. This order is composed of anaerobic chemoorganotrophic bacteria that are, for the most part, hyper/thermophilic. Numerous lateral gene transfers have contributed to the evolutionary history of the Thermotogales, implying the potential involvement of viruses. Here, we will report the characterization of two new siphoviruses MCV1 and MCV2 that infect two strains of Marinitoga camini. Those bacterial strains were isolated from two deep-sea hydrothermal vents sites (Menez Gwen and Lucky strike) in the Mid Atlantic Ridge. These viruses are temperate with a high basal production of virions (>107 virions/mL). Comparative genomics with MPV1, a virus isolated from M. piezophila, was performed and show that those bacterioviruses share numerous similarities. A set of “core genes” shared by all these three viruses was identified and includes proteins involved in DNA metabolism, head and tail assembly and lysogenic cycle. Shared hypothetical proteins were also identified, suggesting that these unknown proteins probably provide important functions for these viruses. Interestingly, for genes with blastp matches in Genbank, over 60% have their top matches, outside the Thermotoga, to genes from Firmicutes and bacterioviruses associated to Firmicutes. We also analyzed the genome of Thermosipho sp. 1244 and studied his CRISPR-cas system. Our results indicated that thisThermosipho strain, with a complete and functional CRISPR-cas system, had already been infected by MCV1, MCV2 or a similar virus. The analyses presented here extend our knowledges about these newly discovered viruses in the deeply branching bacterial phylum Thermotogae. This bacterial order and associated mobile genetic elements are significant for addressing long-term evolutionary adaptation to fluctuant and extreme physicochemical conditions
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Lima, Hugo Gomes de. "Técnicas de diversidade cooperativa para o sistema mobile WIMAX." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/2118.
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Mestrado em Engenharia Electrónica e TelecomunicõesAs comunicações cooperativas são uma das áreas de pesquisa em maior crescimento e é provável que sejam uma tecnologia essencial para o uso eficiente do espectro rádio nos próximos anos. A ideia chave na cooperação do utilizador é a da partilha de recursos entre múltiplos nós da rede. Esta dissertação insere-se na área das comunicações sem fios e tem como principal objectivo estudar, implementar e avaliar o desempenho de esquemas de diversidade cooperativa projectados para o sistema WiMAX Móvel. É feito o estudo de técnicas de retransmissão através de terminais acessórios, constituídos por antenas simples ou agregados de antenas. Foram igualmente estudados dois protocolos de retransmissão dos sinais cooperativos: Equalize and Forward e Decode and Forward. Foram comprovadas melhorias no uso de diversidade cooperativa, em especial em sistemas equipados com elementos retransmissores de antenas múltiplas, em comparação com o desempenho de sistemas MIMO não cooperativos. Estas técnicas permitem aumentar a cobertura e contornar os problemas relacionados com a má qualidade de canal entre emissor e receptor, melhorando o seu desempenho, especificamente ao nível da taxa de erros de transmissão.
Cooperative communications is one of the emerging research areas and is likely to become an essential technology for an efficient use of the radio spectrum throughout the next years. The key concept in the users cooperation is the resource share between multiple network nodes. This dissertation is included in the wireless communication area and its main objective is to study, implement and evaluate the performance of cooperative diversity schemes for the Mobile WiMAX system. Relaying techniques over terminals equipped with single and multiple antennas were implemented. Two cooperative diversity schemes, Decode and Forward and Amplify and Forward, were also developed. The use of cooperative diversity proved to be beneficial, especially to systems equipped with multiple antenna relays, in comparison to non cooperative MIMO systems. The developed techniques provide wider coverage areas and ensure the mitigation of problems related to the emitter/receiver poor channel quality, improving specifically the bit error rate performance.
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Alam, Muhammad. "Inter layer and cooperative design strategies for green mobile networks." Doctoral thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12856.
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Doutoramento conjunto MAP-i em InformáticaThe promise of a truly mobile experience is to have the freedom to roam around anywhere and not be bound to a single location. However, the energy required to keep mobile devices connected to the network over extended periods of time quickly dissipates. In fact, energy is a critical resource in the design of wireless networks since wireless devices are usually powered by batteries. Furthermore, multi-standard mobile devices are allowing users to enjoy higher data rates with ubiquitous connectivity. However, the bene ts gained from multiple interfaces come at a cost in terms of energy consumption having profound e ect on the mobile battery lifetime and standby time. This concern is rea rmed by the fact that battery lifetime is one of the top reasons why consumers are deterred from using advanced multimedia services on their mobile on a frequent basis. In order to secure market penetration for next generation services energy e ciency needs to be placed at the forefront of system design. However, despite recent e orts, energy compliant features in legacy technologies are still in its infancy, and new disruptive architectures coupled with interdisciplinary design approaches are required in order to not only promote the energy gain within a single protocol layer, but to enhance the energy gain from a holistic perspective. A promising approach is cooperative smart systems, that in addition to exploiting context information, are entities that are able to form a coalition and cooperate in order to achieve a common goal. Migrating from this baseline, this thesis investigates how these technology paradigm can be applied towards reducing the energy consumption in mobile networks. In addition, we introduce an additional energy saving dimension by adopting an interlayer design so that protocol layers are designed to work in synergy with the host system, rather than independently, for harnessing energy. In this work, we exploit context information, cooperation and inter-layer design for developing new energy e cient and technology agnostic building blocks for mobile networks. These technology enablers include energy e cient node discovery and short-range cooperation for energy saving in mobile handsets, complemented by energy-aware smart scheduling for promoting energy saving on the network side. Analytical and simulations results were obtained, and veri ed in the lab on a real hardware testbed. Results have shown that up to 50% energy saving could be obtained.
A promessa de uma experiência realmente móvel é de ter a liberdade de deambular por qualquer sítio e não estar preso a um único local. No entanto, a energia requerida para manter dispositivos móveis conectados à rede, num período extenso de tempo, o mesmo rapidamente se dissipa. Na realidade, a energia é um recurso crítico no design de redes sem fios, uma vez que esses dispositivos são alimentados por baterias. Para além disso, dispositivos móveis multi-standard permitem que os utilizadores desfrutem de elevadas taxas de dados com conectividade omnipresente. No entanto, as vantagens adquiridas pelas múltiplas interfaces, imputa uma despesa, sendo essa um consumo maior de energia, numa era onde os dispositivos móveis têm de ser energicamente complacentes. Esta preocupação é reafirmada pelo facto de que a vida da bateria é uma das principais razões que impede os utilizadores de usufruir e utilizar de serviços de multimédia mais avançados nos seus dispositivos, numa base frequente. De forma a assegurar a entrada no mercado para serviços da próxima geração, eficiência energética tem de ser colocada na vanguarda do design de sistemas. No entanto, apesar de esforços recentes, funcionalidades que cumpram os requisitos energéticos em tecnologias "legacy" ainda estão nos seus primórdios e novas abordagens disruptivas são requeridas, juntamente com abordagem de design interdisciplinar, de forma a aproveitar a poupança energética das diversas camadas protocolares. Uma bordagem promissora são os sistemas de cooperação inteligente, que exploram não são contexto da informação, mas também as entidades que são igualmente capazes de formar uma coligação e cooperam de forma a atingir um objectivo comum. Migrar a partir destas referências, esta tese investiga como é que este paradigma tecnológico pode ser aplicado para reduzir a potência e consumo de energia em redes móveis. Para além disso, introduzimos uma dimensão de poupança energética adicional, para adopção de design de camadas intermédias, de forma a que as camadas de protocolos sejam concebidas para trabalhar em sinergia com o sistema anfitrião, ao invés de independentemente, para aproveitamento de energia. Neste trabalho, nós exploramos o contexto da informação, cooperação e design de camadas intermédias para desenvolver blocos de construção energicamente eficientes e tecnologias agnósticas para redes móveis. Estes habilitadores (enablers) tecnológicos incluem um nó de descoberta de energia eficiente e cooperação de curto alcance para poupança energética em aparelhos móveis, complementado com agendamento inteligente, energicamente consciente, de forma a promover a poupança de energia do lado da rede. Analiticamente e simultaneamente, foram obtidos resultados e verificados em laboratório, num modelo de hardware protótipo. Resultados demonstram que pode ser obtido uma poupança energética acima dos 50%.
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Teixeira, Fábio Vieira 1987. "Infraestrutura de rede de sensores sem fio para ambientes assistivos." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260196.
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Orientador: Eleri CardozoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Na última década, as redes de sensores sem fio foram alvo de várias pesquisa em diversas áreas, entre elas a Robótica Móvel e Ambientes Inteligentes. Com o uso dessa tecnologia é possível estender as capacidades de sensoriamento de robôs móveis para o ambiente em que se encontram, além de aumentar a abrangência da conectividade sem fio. Devido à grande exploração da área e o grande avanço das tecnologias CMOS, novos módulos de sensoriamento, como câmeras, puderam ser desenvolvidos e embarcados em transceptores de baixo custo. A interconexão dessas fontes compostas de múltiplas mídias deu origem a uma nova tecnologia, as Redes de Sensores Multimídia Sem Fio. Essas redes possibilitam o desenvolvimento de uma grande quantidade de aplicações que antes não eram possíveis apenas com o uso de sensores escalares, por exemplo, em áreas relacionadas ao controle de tráfego, vigilância, automação residencial e cuidados com a saúde. Esta dissertação explora o uso desta nova tecnologia para o desenvolvimento de uma infraestrutura capaz de prover serviços a robôs móveis semi-autônomos em ambientes instrumentados para acessibilidade, a fim de auxiliá-los no cumprimento de seus objetivos
Abstract: In the last decade, Wireless Sensor Networks have been the subject of research in many areas, including Mobile Robotics and Smart Environments. Such technology enables the extension of the mobile robots' sensing capabilities towards the environment where they are operating, as well as the increasing of the wireless connectivity coverage. Due to the large exploration of the area and the steady advance of CMOS technologies, new sensing modules such as cameras have being developed and embedded into low cost transceivers. The interconnection of multiple media sources raised a new technology known as Wireless Multimedia Sensor Networks. These networks allow the development of a wide range of applications that were not possible before using only scalar sensors, especially in areas related to traffic control, surveillance, home automation, and health care. This dissertation explores this new technology for the development of an infrastructure that provides services to semi-autonomous mobile robots in environments instrumented for accessibility, in order to assist the accomplishment of the robot's goals
Mestrado
Engenharia de Computação
Mestre em Engenharia Elétrica
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Robles, Sergi. "Mobile agent systems and trust, a combined view toward secure sea-of-data applications." Doctoral thesis, Universitat Autònoma de Barcelona, 2002. http://hdl.handle.net/10803/3025.
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La tecnología de agentes permite, sin lugar a dudas, el diseño de nuevos tipos de aplicaciones distribuidas. Los agentes móviles aun van más allá en esta dirección siendo la única alternativa para hacer posible ciertos tipos de aplicaciones, como las basadas en Mar de Datos o aplicaciones específicas de computación penetrante.Las ventajas que aportan las nuevas características de esta tecnología tienen su contrapartida en los nuevos problemas de seguridad que comportan. La complejidad del diseño de soluciones de seguridad usando agentes móviles es extremadamente alta, especialmente para aplicaciones basadas en mar de datos. A lo largo de este trabajo puede encontrarse un estudio del problema de la seguridad en la tecnología de agentes móbiles.
No existe una plataforma de desarrollo de agentes móviles en la que se puedan implementar este nuevo tipo de aplicaciones, ofreciendo seguridad al mismo tiempo y facilidad de programación. Presentamos en este trabajo el comienzo del diseño y del desarrollo de MARISM-A, una plataforma segura para agentes móviles con itinerario recursivo y migración segura. La plataforma cumple con los principales estándares en agentes: FIPA y MASIF. A la vez, ofrece flexibilidad para la implementación de cualquier tipo de aplicaciones, incluyendo las basadas en mar de datos, y permite ser extendida con nuevos mecanismos de seguridad.
Encontrar los requerimientos de seguridad de estas nuevas aplicaciones, y soluciones para ellos, no es una tarea fácil. Los mecanismos habituales no son válidos en estos nuevos escenarios. Presentamos tambien en esta tesis un nuevo enfoque basado en un modelo de confianza y en una metodología, para determinar estos requerimientos de seguridad y las soluciones más convenientes. En la tesis también puede verse cómo nuestra propuesta se utiliza en la práctica proporcionando un ejemplo basado en un escenario de una aplicacion típica de mar de datos en MARISM-A.
Agent technology is clearly an important enabler of new distributed applications. Mobile agents provide a further step in this direction and make possible new types of applications, such as sea-of-data applications or specific pervasive (ubiquitous) computing.
The main drawback of the new capabilities featuring this technology is the arising of new branches of security issues. It results hard to design security solutions for applications using mobile agents, especially in sea-of-data applications. In this work we will analise the problem of security in mobile agent systems.
There is not a definitive platform in which implement these applications and still offering security and ease to program. We present the start of the development of MARISM-A, an Architecture for Mobile Agents with Recursive Itinerary and Secure Migration. This platform intends to observe commonly accepted agent standards FIPA and MASIF. At the same time it provides flexibility to design any type of application, including sea-of-data applications, and allows to be extended with new security solutions.
Finding out the security requirements of these new applications is not an easy task. Traditional approaches are not valid in these new scenarios. We present in this thesis a new approach based on a trust model and a methodology to find out security requirements and solutions. In this work we show how our approach can be used providing an example based on a scenario of a typical sea-of-data application in MARISM-A.
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Dupire, Gaël. "Maillage fixe et domaine mobile." Compiègne, 2009. http://www.theses.fr/2009COMP1809.
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Dans le domaine de la modélisation numérique, la résolution des équations aux dérivées partielles occupe une place centrale. L’approche par éléments finis impose d’utiliser un maillage qui reproduit le domaine d’étude sous une forme discrétisée sur lequel s’appuient les fonctions de forme. Lorsque le domaine change de forme (problèmes d’évolution ou optimisation), le maillage se déforme et les fonctions de forme associées peuvent dégénérer, ce qui conduit à des procédures lourdes de remaillage et de transfert de champs qui s’accompagnent de pertes de précision. Mes travaux portent sur l’étude d’une nouvelle formulation dans laquelle les fonctions de forme sont associées à un maillage fixe structuré correspondant à une boîte englobant le domaine. Le prix à payer pour obtenir cette simplification est la perte d’ellipticité de la forme bilinéaire associée. J’étudie cette nouvelle formulation, tant du point de vue théorique (convergence) que du point de vue mise en forme numérique et de l’optimisation de cette mise en œuvreThe aim of our work is to study a meshfree method introduce recently in by S. Dumont, O. Goubet, T. Ha Duong and P. Villon for the numerical resolution of an elliptic boundary value problem. We are motivated by problems of surface evolution problem like Hele-Shaw flow where the speed of the moving interface is governed by the solution of an boundary value problem posed on the moving domain. In 3D-problems, the induced remeshing can be expensive. Moreover, the projection of the computed solution on the new mesh is a costly operation which may deteriorate the quality of the computed solution. Hence we seek to avoid this remeshing stage. Many techniques have been developed in that direction. One idea is to include our domain in a bounding box and solve an equivalent problem on this box. This is the case of the fictious domainmethod. This approach has been applied in for surface evolution problem for exemple. In case of cracks growth, an eXtended Finite Element Method has been also used in with satisfactory numerical result. The common feature of these methods is to increase the number of degree of freedom by adding either nodes, either dedicated basis functions
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Liu, Siyuan. "Learning from small data set for object recognition in mobile platforms." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849633/.
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Did you stand at a door with a bunch of keys and tried to find the right one to unlock the door? Did you hold a flower and wonder the name of it? A need of object recognition could rise anytime and any where in our daily lives. With the development of mobile devices object recognition applications become possible to provide immediate assistance. However, performing complex tasks in even the most advanced mobile platforms still faces great challenges due to the limited computing resources and computing power.
In this thesis, we present an object recognition system that resides and executes within a mobile device, which can efficiently extract image features and perform learning and classification. To account for the computing constraint, a novel feature extraction method that minimizes the data size and maintains data consistency is proposed. This system leverages principal component analysis method and is able to update the trained classifier when new examples become available . Our system relieves users from creating a lot of examples and makes it user friendly.
The experimental results demonstrate that a learning method trained with a very small number of examples can achieve recognition accuracy above 90% in various acquisition conditions. In addition, the system is able to perform learning efficiently.
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Oliveira, Talmai Brandão de. "THE RELIABILITY OF BROADCASTING PROTOCOLS FOR MOBILE AD-HOC NETWORKS." Escola Politécnica / Instituto de Matemática, 2007. http://repositorio.ufba.br/ri/handle/ri/21576.
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Uma rede móvel ad-hoc (MANET) é formada por um grupo de dispositivos móveis (também conhecidos como nós) que podem se comunicar diretamente apenas com os nós restritos a área delimitada pelos seus rádio transmissores. Este tipo de rede está impulsionando aplicações inovadoras que combinam a computação móvel, a comunicação sem fio, além de sensores e atuadores especializados.
O processo pelo qual um n´o envia uma mensagem para todos os outros n´os da rede ´e conhecida como difus˜ao (broadcasting). Esta ´e uma primitiva de comunica¸c˜ao fundamental devido `a sua utiliza¸c˜ao na coleta de informa¸c˜oes da rede, no suporte aos algoritmos de endere¸camento e no apoio aos protocolos de roteamento. N˜ao obstante a sua importˆancia em redes MANETs, pouca aten¸c˜ao tem sido dedicada `a satisfa¸c˜ao de requisitos de confiabilidade. Tais requisitos buscam garantir a entrega segura e correta de mensagens enviadas atrav´es desta primitiva. Este trabalho estuda o problema de difus˜ao em redes MANETs. Diversos protocolos foram propostos para esta primitiva e muitos deles suportam bem a mobilidade dos n´os e os problemas de colis˜ao e congestionamento da rede. De fato, pode-se considerar que todos eles s˜ao tolerantes a falhas do tipo fail-stop. Entretanto, quando cen´arios de execu¸c˜ao mais realistas s˜ao considerados, outra classe de falhas – as de omiss˜ao – podem ocorrer. Estas, modelam melhor falhas transientes que incorrem durante a comunica¸c˜ao. Desta forma, neste trabalho, avaliamos o desempenho dos protocolos atrav´es de experimentos de simula¸c˜ao num cen´ario de falhas mais realista, caracterizado por omiss˜ao. Em conclus˜ao, mostramos que boa parte dos protocolos existentes exibem uma queda significativa nas suas taxas de entrega quando colocados nesse cen´ario. Como resultado direto dos estudos conduzidos, um novo mecanismo ´e proposto capaz de aumentar a confiabilidade de protocolos de difus˜ao atrav´es da identifica¸c˜ao dos melhores vizinhos para comunica¸c˜ao. Este mecanismo, al´em de suportar crescimento em escala da rede, ´e capaz de garantir boas taxas de entrega com tempos relativamente baixos, mesmo em ambientes com falhas por omiss˜ao. Resultados de simula¸c˜oes demonstram sua eficácia
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Al-Sultany, Ghaidaa Abdalhussein Billal. "Automatic message annotation and semantic interface for context aware mobile computing." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6564.
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In this thesis, the concept of mobile messaging awareness has been investigated by designing and implementing a framework which is able to annotate the short text messages with context ontology for semantic reasoning inference and classification purposes. The annotated metadata of text message keywords are identified and annotated with concepts, entities and knowledge that drawn from ontology without the need of learning process and the proposed framework supports semantic reasoning based messages awareness for categorization purposes. The first stage of the research is developing the framework of facilitating mobile communication with short text annotated messages (SAMS), which facilitates annotating short text message with part of speech tags augmented with an internal and external metadata. In the SAMS framework the annotation process is carried out automatically at the time of composing a message. The obtained metadata is collected from the device’s file system and the message header information which is then accumulated with the message’s tagged keywords to form an XML file, simultaneously. The significance of annotation process is to assist the proposed framework during the search and retrieval processes to identify the tagged keywords and The Semantic Web Technologies are utilised to improve the reasoning mechanism. Later, the proposed framework is further improved “Contextual Ontology based Short Text Messages reasoning (SOIM)”. SOIM further enhances the search capabilities of SAMS by adopting short text message annotation and semantic reasoning capabilities with domain ontology as Domain ontology is modeled into set of ontological knowledge modules that capture features of contextual entities and features of particular event or situation. Fundamentally, the framework SOIM relies on the hierarchical semantic distance to compute an approximated match degree of new set of relevant keywords to their corresponding abstract class in the domain ontology. Adopting contextual ontology leverages the framework performance to enhance the text comprehension and message categorization. Fuzzy Sets and Rough Sets theory have been integrated with SOIM to improve the inference capabilities and system efficiency. Since SOIM is based on the degree of similarity to choose the matched pattern to the message, the issue of choosing the best-retrieved pattern has arisen during the stage of decision-making. Fuzzy reasoning classifier based rules that adopt the Fuzzy Set theory for decision making have been applied on top of SOIM framework in order to increase the accuracy of the classification process with clearer decision. The issue of uncertainty in the system has been addressed by utilising the Rough Sets theory, in which the irrelevant and indecisive properties which affect the framework efficiency negatively have been ignored during the matching process.
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Martinsen, Pal-Erik. "Configuration and Implementation Issues for a Firewall System Running on a Mobile Handset." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16095/.
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Any device connected to the Internet needs to be protected. Using a firewall as a first line of defence is a very common way to provide protection. A firewall can be set up to protect an entire network or just a single host. As it is becoming more and more popular to connect mobile phones and other hand held devices to the Internet, the big question is;"how to protect those devices from the perils of the Internet?" This work investigates issues with the implementation of a firewall system for protecting mobile devices. Firewall administration is an error prone and difficult task. Setting up a correctly configured firewall in a network setting is a difficult task for a network administrator. To enable an ordinary mobile phone user to set up a firewall configuration to protect his mobile phone it is important to have a system that is easy to understand and warns the user of possible mistakes. Generic algorithms for firewall rule-set sorting and anomaly discovery are presented. This ensures that the rule-set is error free and safe to use. This is a vital part of any firewall system. The prototype developed can be used to find errors in existing firewall rule-sets. The rule-set can be in either a native firewall configuration format (currently only IPF is supported) or in a generic XML format. This generic XML format was developed as a part of this research project. Further a new graphical visualization concept that allows the end user to configure an advanced firewall configuration from a device with a small screen and limited input possibilities is presented.
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Polte, Patrick. "Ecological functions of intertidal seagrass beds for fishes and mobile epibenthos in the northern Wadden Sea." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=979700191.
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Mary, Philippe. "Etude analytique des performances des systèmes radio-mobiles en présence d'évanouissements et d'effet de masque." Phd thesis, INSA de Lyon, 2008. http://tel.archives-ouvertes.fr/tel-00406310.
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Cette thèse a pour but l'analyse des performances d'une communication radio en présence d'évanouissements et d'effet de masque. Le masquage, du aux obstacles entre l'émetteur et le récepteur, fait varier la probabilité d'erreur moyenne ("Symbole Error Probability" SEP). L'étude de la probabilité de coupure symbole (SEO "Symbol error Outage") définie comme la probabilité que le SEP moyen excède une valeur seuil est donc plus pertinent. La difficulté de son étude réside dans le fait qu'une inversion du SEP moyen par rapport au SNR (Signal to Noise Ratio) est nécessaire. Par la méthode de Laplace nous donnons des approximations précises à tout SNR du SEP dans un canal de Nakagami-m et Rice dans le cas mono-antenne. Nous montrons ensuite que ces approximations sont inversibles par rapport au SNR et permettent d'exprimer analytiquement le SEO en fonction du SEP cible. Nous intégrons ensuite le codage canal et dérivons des expressions analytiques de la probabilité de coupure paquet pour un codage bloc puis un codage convolutif à entrée décidée. Nous étendons l'étude aux systèmes MIMO à codage bloc orthogonaux puis à multiplexage spatial où des formes exactes du SEO sont dérivées. Nous considérons le cas où des interférents sont présents. Nous dérivons une approximation précise et inversible de la probabilité d'erreur lorsque les signaux se propagent à travers un canal à évanouissements rapides de Rayleigh. Enfin parce que la prise en compte de l'interférence est un moyen avéré d'augmenter la capacité des réseaux, nous étudions les performances de la détection multiutilisateurs à maximum de vraisemblance (MUD-MLSE), dans un contexte WLAN à canaux recouvrant.
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Souza, Ivana dos Santos de Lima e. "Semantikos: proposta de interfaces para aplicativo mediador de t?cnica de diferencial sem?ntico em mobile tablet." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br/handle/123456789/20079.
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Esta pesquisa tem como objetivo sistematizar uma proposta preliminar para o desenvolvimento de um aplicativo mobile tablet, com o intuito de auxiliar na aplica??o da t?cnica de Diferencial Sem?ntico ? DS, sob a abordagem do Design Participativo. A t?cnica de Diferencial Sem?ntico, idealizada por Osgood et al. (1957), vem sendo utilizada para medir a percep??o afetiva de indiv?duos a objetos e conceitos por meio de escalas compostas por adjetivos bipolares, a partir dos modelos te?ricos em que a t?cnica est? apoiada. Durante a aplica??o da t?cnica com os usu?rios em potencial, o pesquisador precisa administrar contextos diversos, simultaneamente, com uso de equipamentos, quando autorizado, e observar e registrar relatos espont?neos do usu?rio/respondente. Observa-se que h? uma sobrecarga cognitiva durante esse evento. Dessa maneira, utiliza-se um ?nico aplicativo cuja interface ? elaborada com a finalidade de melhorar o grau de satisfa??o dos usu?rios da t?cnica de DS, isto ?, os pesquisadores e colaboradores respondentes. A presente pesquisa, objetivando entender os processos inerentes ? tarefa de aplica??o da t?cnica de Diferencial Sem?ntico, seguiu as seguintes etapas: a) a capacita??o de usu?rios; b) question?rio de background; c) entrevista com Grupo de Foco; d) desenvolvimento de prot?tipos; e e) Avalia??o Cooperativa. Foram observadas e registradas as rea??es e impress?es dos usu?rios a partir da experi?ncia com a t?cnica de DS. Com base nessas observa??es, a hip?tese da pesquisa confirmou-se em rela??o ? viabilidade de utiliza??o de um aplicativo para mobile tablet, como mediador na aplica??o da t?cnica de Diferencial Sem?ntico, ? medida que convergem as etapas para um s? dispositivo, melhora a execu??o da tarefa entre o usu?rio/pesquisador e o usu?rio/respondente, promovendo a satisfa??o dos envolvidos.
This research aims to systematize a proposal of developing a mobile tablet application in order to help implementing the Semantic Differential technique ? SD, under the approach of Participatory Design. In 1975, Osgood et al. created the Semantic Differential technique. Since then, many experiments use it to measure the affective perception of individuals concerning objects and concepts by means of compounded scales of bipolar adjectives, based on the theoretical models that support the technique: the conductible, spatial and metric models. During the application of the technique with potential users, the researcher must simultaneously manage several contexts, that is, audio recorder, when authorized, and observe and record spontaneous reports of the respondent. It is noticeable that often occurs a cognitive overload during this event. Thus, the use of a single application whose interface is assigned to its users and respondents could assist researchers in applying the SD technique. This research aimed to understand the processes inherent to the task of implementing the Semantic Differential technique and obeyed the following steps: a) training of users, b) background questionnaire c) interview with Focus Group, and d) cooperative evaluation. Besides these procedures, one can also observe the degrees of facilitation or difficulty concerning the use of the conventional model, which is the development and application of scales with the aid of printed material, pencil, pens, clipboards, and recorder software for editing the document and data analysis. This paper comprises reactions and impressions from the experiences of users of SD technique. Considering the data recollected from the user?s observation, the hypothesis of the experiment proved to be right. It means that the development of the application for mobile tablet employing the technique of Semantic Differential is viable, since it assembles all the steps in one only tool, increases the accomplishment of the task between user/researcher and user/respondent resulting in their mutual satisfaction.
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Cibangu, Sylvain. "Mobile phones' contributions to socio-economic development according to Sen : corn growers' perceived impact in the Congo." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23013.
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Research questions: This research was focused on exploring the impact of communication technologies on rural populations in the Congo. In particular, this research posed two questions: 1. Do mobile phones produce development in rural areas of the Congo? 2. Do mobile phones improve the living conditions of people? The questions helped examine ways in which mobile phones were or were not engendering development among these populations. Methods: The research was undertaken using four methods: 1. Phenomenology, 2. Sen's capability approach, 3. Participatory method, and 4. Ecological method. Phenomenology aimed to cater to the experiences and meanings of mobile phone uses. Sen's capability approach allowed the interviews to be focused on the basic needs of the poor. Participatory method provided a greater participation of respondents in discussion groups, and ecological method helped achieve a higher inclusion of key players in the targeted area. Major findings: The major findings of this study included: 1. Much of the literature on mobile phones and development was not representative or inclusive of key players and their day-to-day lives. 2. Studies have tended to present snapshots or single-focused accounts of mobile phone and development. 3. Authors of mobile phone research have tended to see rural populations with an urban-led bias, leaving aside the actual characteristics of rural areas. 4. Mobile phones were not limited to a person and her properties, but rather mobile phones were owned and shared by the community. 5. Participants expressed a need for technical skills and means to be available to the community and their members. 6. Households were not separated, but rather they were connected to allow people take care of one another. 7. People were connected through collective solidarities in order to come to the aid of those with special needs. 8. Literature and mobile phone sponsors or companies were disseminating mobile phones with an extractive and commercial tendency, focused principally on fees of batteries, chargers, and prepaid cards. Major contributions: The major contributions of this research revolved around the focus on: 1. technology to enhance the needed technical skills among concerned populations. 2. shared ownership of mobile phones to cater to both users and non-users of mobile phones among concerned populations. 3. connected households to capitalize on the dynamics of family among concerned populations. 4. collective solidarities to accommodate the processes of aiding one another among concerned populations. 5. capabilities, from a commercial or extractive aspect to capabilities to enhance the capabilities of people to afford mobile phones fees. 6. capabilities, from a corporate or business aspect to capabilities to enhance the capabilities of people who did not and could not own a business. 7. human basic needs to enhance the capabilities of mobile phone users with regard to human basic needs. 8. outliers or the marginalized to attend to those left out among concerned populations. 9. mobile phone-centric libraries to enhance the storage and retrieval of needed information among concerned populations.
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Flach, Christopher. "EN KVANTITATIV STUDIE PÅ ANVÄNDNING OCH ACCEPTANS AV MOBILA PLÅNBÖCKER : Analys med PLS-SEM." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11483.
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Den mobila plånboken gör det möjligt att kunna utföra betalningar med hjälp av sin smarttelefon i butiker och har funnits tillgänglig i både Sverige och andra länder runt om i världen under en längre tid. Trots detta visar studier på att denna teknik inte har blivit accepterad av konsumenterna vilket även gör att butiker är motvilliga att investera i denna typ av teknik. Syftet med undersökningen som har genomförts i denna rapport är att delvis undersöka hur utbrett användningen av mobila plånböcker är bland studenter på Högskolan i Skövde, det huvudsakliga syftet är dock att identifiera de faktorer som påverkar konsumenternas acceptans och avsikt att använda mobila plånböcker. Att skaffa en förståelse till hur och varför en individ väljer att acceptera en ny teknik anses vara en av de viktigaste forskningsaspekterna inom informationssystem. Arbetet baseras på en undersökningsmodell som främst härstammar från UTAUT2 och där analysen av data utfördes med PLS-SEM. Resultatet från denna undersökning kan komma att hjälpa de parter och organisationer som är delaktiga i tillhandahållningen av tjänsten mobila plånböcker att identifiera vilka faktorer konsumenter anser vara viktigast för att påbörja användningen av mobila plånböcker och vad som leder till fortsatt användning. Resultatet av undersökningen visar bland annat på att upplevt värde och förväntad prestanda har störst effekt på avsikten att använda mobila plånböcker.
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Simonetti, Jose Eduardo. "Mobile ID in physical access control applications." reponame:Repositório Institucional do FGV, 2016. http://hdl.handle.net/10438/17981.
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Today there exist a myriad of different types of physical access control systems (PACS) that use a smart card or mobile device as a key. The mobile device enabled smart locks, as they are often referred to, operate using either Wi-Fi or Bluetooth. This thesis has explored the use of a third emerging wireless technology called Near Field Communication (NFC) available in mobile devices such as smartphones. Near Field Communication (NFC) technology is a relatively new technology that is on the rise and is included in almost every new mobile device. By leveraging Near Field Communication (NFC) enabled mobile devices, a highly secure access control system can be achieved and developed taking advantage of the computational power of smartphones in comparison to traditional methods the business implications are huge, Several different authentication and encryption protocols, mobile operating systems and Near Field Communication (NFC) modes of operation where analyzed and evaluated. After considerations technical considerations the Secure Remote Password authentication protocol on top of Near Field Communication (NFC) card emulation (CE) scheme with the client application running on smartphones operating system (OS) was selected. This thesis shows that Near Field Communication (NFC) enables a mobile device to act as a key in a secure access control system (PACS) and as the user base for NFC grows larger so will the likelihood that we will come to see more of these types of systems in business and organizations.
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Tian, Fengrui. "Rationalizing (In)Capacities: The Impacts of NGOs' Ways to Mobilize Resources." Thesis, Boston College, 2020. http://hdl.handle.net/2345/bc-ir:108929.
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Thesis advisor: Julia ChuangExisting literature on NGOs in China depicted NGOs as either depoliticized service providers or harbinger of democracy expecting them to mobilize movements or participate in policy advocacy. However, few explain what accounts for differences in their capacities. While some scholars argue that NGOs’ relations with different actors in the field have influence on variations of their capacities, they do not disaggregate what resources are mobilized in such relationship management. Extending their arguments, I argue that NGOs leverage relationships to obtain essential resources such as symbolic legitimation from the state, financial support from civil society actors and social embeddedness from constituencies to operate effectively. Drawing upon four months ethnography on three NGOs serving the needs of sex workers in greater China region, I illustrate how these NGOs are either capable of carrying out their original political mission—to decriminalize sex work in China—or deflected into service provision, through their mobilization and attainments of different resources
Thesis (MA) — Boston College, 2020
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Sociology
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Souza, Gabriela Coutinho Machado de. "Policy-based routing for mobile ad hoc networks running HTR protocol." Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/11991.
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The increasing growth of mobile devices in the whole world, and the forecasts for the coming years has been indicated by several reports. Nonetheless, this need for ubiquitous collaboration has brought new possibilities and challenges to the scientific community. Mobile Ad hoc Networks (MANETs) emerges in this scenario allowing devices to interconnect autonomously, without the need of a fixed infrastructure, in order to provide communication and information services. Due to such decentralization and the natural constraints of mobile devices, it remains, to this day, a challenge to provide efficient routing for MANETs. In this dissertation we propose new routing enhancements based on policies for MANETs running the HTR protocol. We consider the role(s) a user associated to a device performs within an organization. Hence our policies can guide the routing based on these roles. With this scheme we improve communication according to different business needs and scenario requirements. To this end, we propose a set of policies that affects the routing behavior and present four case studies to present each policy. Then we analyze two policies in terms of end-to-end delay, and nodes’ lifetime. Through simulation we evaluate these metrics while varying parameters such as the amount of nodes participating in the network, the mobility characteristics, and the number of traffic sources. Our results show that it is possible to achieve these goals without causing great impact on the average end-to-end delay and energy consumption, two important metrics in any MANET evaluation. We explore the results in several scenarios and detail our findings, which can provide a different perspective for future MANET applications.Submitted by João Arthur Martins (joao.arthur@ufpe.br) on 2015-03-10T18:42:15Z No. of bitstreams: 2 Dissertação Gabriela Coutinho.pdf: 1701782 bytes, checksum: 113328c2efdd1ba97f7a237d03cab574 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
Made available in DSpace on 2015-03-11T17:46:06Z (GMT). No. of bitstreams: 2 Dissertação Gabriela Coutinho.pdf: 1701782 bytes, checksum: 113328c2efdd1ba97f7a237d03cab574 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2013-09-13
O crescimento das vendas de aparelhos móveis em todo o mundo, bem como as previsões para os próximos anos são apontadas em diversos relatórios. No entanto, essa necessidade de colaboração ubíqua trouxe novas possibilidades e desafios para a comunidade científica. Redes móveis ad hoc (Mobile Ad hoc Networks - MANETs) surgem diante deste cenário e permite que dispositivos se comuniquem de forma autônoma, sem a necessidade de uma infraestrutura predefinida para fornecer comunicação e serviços. Porém, essa descentralização junto com as restrições naturais dos dispositivos móveis, proporcionar roteamento eficiente para MANETs permanece um desafio. Este trabalho propõe novas melhorias para o roteamento em MANETs que utilizam o protocolo HTR. Também considera o papel que usuários associados aos dispositivos desempenham dentro de uma organização. Desta forma, as políticas desenvolvidas podem guiar o roteamento também com base nestes papéis. Com este esquema, é possível melhorar a comunicação de acordo com necessidades de negócio e requerimentos de cenário. Para este fim, esta dissertação propõe um conjunto de políticas que afetam o comportamento do roteamento e analisa os impactos em termos de atraso, energia gasta e tempo de vida dos nós. Através de simulações, essas métricas são avaliadas também com variação de parâmetros como a quantidade de nós que participam da simulação, as características de mobilidade e o número de fontes de tráfego. Resultados mostram que é possível atingir esses objetivos sem causar grande impacto negativo no atraso fim a fim e no consumo de energia, duas métricas importantes em avaliações de redes MANET. Nós exploramos esses resultados em diversos cenários e detalhamos nossas descobertas, que podem servir como uma perspectiva diferente para futuras aplicações de redes MANET.
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Porto, Alex Rocha. "Análise da fase de registro do protocolo mobile IP na presença de canais sem fio utilizando o protocolo 802.11." Instituto Tecnológico de Aeronáutica, 2004. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=558.
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ÉE indiscutível que a Internet apresenta, hoje, um papel importante em nossas vidas. Diversas companhias aéreas, cientes da vantagem competitiva de prover acesso à Internet aos seus clientes, têm gerado uma crescente demanda por novos equipamentos, padrões e tecnologias que permitam o acesso a redes IP a longas distâncias e com grandes áreas de cobertura. Considerando que as atuais soluções comerciais existentes utilizam comunicação por satélite, apresentando alto custo e atraso, além de baixas taxas de transmissão, este trabalho tenta encontrar uma solução alternativa para o acesso à Internet em aeronaves regionais através de pontos de acesso no solo. Assim, optou-se por analisar o comportamento de uma rede aeronáutica utilizando o protocolo Mobile IP, onde uma estação terrestre fornece acesso e recursos de mobilidade a diversas aeronaves em vôo. Para as camadas física e de enlace foi utilizada uma versão modificada do padrão 802.11. Esta análise foi realizada com o auxílio do programa de simulação de redes Opnet Modeler - versão 10, levando-se em conta as limitações do programa no modelamento de enlaces sem fio. A intenção deste trabalho não ée fornecer uma solução final para o acesso a Internet em vôo, mas sim promover a busca por soluções alternativas mais baratas e mais eficientes.
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Liu, Hui. "Topology Control, Routing Protocols and Performance Evaluation for Mobile Wireless Ad Hoc Networks." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/cs_diss/3.
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A mobile ad-hoc network (MANET) is a collection of wireless mobile nodes forming a temporary network without the support of any established infrastructure or centralized administration. There are many potential applications based the techniques of MANETs, such as disaster rescue, personal area networking, wireless conference, military applications, etc. MANETs face a number of challenges for designing a scalable routing protocol due to their natural characteristics. Guaranteeing delivery and the capability to handle dynamic connectivity are the most important issues for routing protocols in MANETs. In this dissertation, we will propose four algorithms that address different aspects of routing problems in MANETs. Firstly, in position based routing protocols to design a scalable location management scheme is inherently difficult. Enhanced Scalable Location management Service (EnSLS) is proposed to improve the scalability of existing location management services, and a mathematical model is proposed to compare the performance of the classical location service, GLS, and our protocol, EnSLS. The analytical model shows that EnSLS has better scalability compared with that of GLS. Secondly, virtual backbone routing can reduce communication overhead and speedup the routing process compared with many existing on-demand routing protocols for routing detection. In many studies, Minimum Connected Dominating Set (MCDS) is used to approximate virtual backbones in a unit-disk graph. However finding a MCDS is an NP-hard problem. In the dissertation, we develop two new pure localized protocols for calculating the CDS. One emphasizes forming a small size initial near-optimal CDS via marking process, and the other uses an iterative synchronized method to avoid illegal simultaneously removal of dominating nodes. Our new protocols largely reduce the number of nodes in CDS compared with existing methods. We show the efficiency of our approach through both theoretical analysis and simulation experiments. Finally, using multiple redundant paths for routing is a promising solution. However, selecting an optimal path set is an NP hard problem. We propose the Genetic Fuzzy Multi-path Routing Protocol (GFMRP), which is a multi-path routing protocol based on fuzzy set theory and evolutionary computing.
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Ylitalo, Frida. "Development of digital sales processes with help of the See-Think-Do-Care model." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185555.
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Digital commerce is a natural part of our everyday life. To fast and easily be able to make purchases from our home without stress has become a matter of course for us. But the new way to make purchases places new demands on the sales, not least at the important customer meeting. The interaction between customer and seller disappears completely and known marketing methods must be adapted to the new conditions. How does the customer journey change when the step from discovering a product to buying it is just a few clicks away? The study aims to investigate and develop a digital sales process for a mobile game aimed for children. The process is based on the marketing framework See-Think-Do-Care and tries to answer questions like which components are needed in a sales flow? How can a product be adapted to different types of users and can UX design be used to get interested customers to buy the product? The method is divided into two different sections. One section for evaluating the chosen marketing framework and another for the development of the sales process. The development of the sales process was made stepwise by prototypes in different degrees of fidelity. The first part of the result ended up in the implementation of the marketing framework, a developed customer journey, and a compilation of ten guidelines to adhere to for increasing the conversion of new customers. The sales flow was then developed step by step from only showing the routing to be a clickable solution similar to the intended end product. The di↵erent prototypes were evaluated by user testing and it was shown that the largest problem was not to make users understand the sales flow, it was to make them understand the actual product. The hope is that the result of the study will be able to be tested in production and be used in the real sales of the product.
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Vilela, Mateus Aparecido. "Uma solução de roteamento para redes de sensores sem fio móveis heterogêneas." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/553.
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Previous issue date: 2012-09-28Universidade Federal de Sao Carlos
The Wireless Sensor Networks (WSNs) and Mobile Wireless Sensor Networks (MWSNs) are being increasingly used by different applications, such as monitoring of animals, monitoring of vital signs, environmental monitoring, surveillance and protection of critical infrastructure, leaking gas, among many others. Some of these applications are already making use of mobile sensor nodes, such as underwater monitoring, precision agriculture, among many others. Due to restricted resources of sensor nodes, especially in relation to energy consumption, the development for solutions based on WSN and MWSN becomes limited. The use of mobile sensor nodes, which typically has more computational resources, power and communication, can help to reduce the energy consumption of fixed nodes, increasing the lifetime of the network. Networks that use mobile sensor nodes (fixed and mobile) with different types of hardware are called Wireless Sensor Networks Heterogeneous Mobile. This paper presents the RAHMoN (Routing Algorithm for Heterogeneous Mobile Networks), which makes use of data aggregation technique to reduce the traffic transmissions on the network, hierarchy of nodes (clustering), and use of sensor nodes (fixed and mobile) that collaborate to deliver data to a sink node at high speed. In RAHMoN, the network is configured using the techniques of inundation (flooding) and inundation reverse (reverse flooding) to collect the fixed position of sensor nodes and form an adjacency matrix. This matrix helps to build routes for data delivery to the sink and is stored in the mobile sensor nodes. Results show that our solution can guarantee a high packages delivery rate, low latency and reduce the delay of packet delivery. The solution was compared with the WHISPER, present in the literature and also focused on the delivery of data to sink node at high speed.
As Redes de sensores sem Fio (RSSFs) e Redes de Sensores Sem Fio Móveis (RSSFMs) estão sendo cada vez mais utilizadas por diferentes aplicações, tais como: monitoramento de animais, monitoramento de sinais vitais, monitoramento ambiental, vigilância e proteção de infraestruturas críticas, vazamento de gás, dentre inúmeras outras. Algumas dessas aplicações já fazem uso de nós sensores móveis. Devido aos recursos restritos dos nós sensores, principalmente em relação ao consumo energético, o desenvolvimento de soluções baseadas em RSSF e RSSFM torna-se limitado. O uso de nós sensores móveis, que tipicamente têm mais recursos computacionais, de energia e de comunicação, pode ajudar a reduzir o consumo de energia dos nós fixos, aumentando o tempo de vida da rede. Redes que utilizam nós sensores (fixos e móveis) com diferentes tipos de hardware são denominadas Redes de Sensores Sem Fio Móvel Heterogênea. Neste trabalho é apresentado o RAHMoN (Routing Algorithm for Heterogeneous Mobile Networks), que faz uso da técnica de agregação de dados para reduzir o tráfego de transmissões na rede, da hierarquização de nós (clustering), da utilização de nós sensores (fixos e móveis) e de um sink em alta velocidade. No RAHMoN, a rede é configurada utilizando flooding e flooding reverse para coletar a posição dos nós sensores fixos e formar uma matriz de adjacência. Essa matriz auxilia na construção de rotas durante a entrega dos dados para o sink e será armazenada nos nós sensores móveis. Resultados de avaliação mostram que a nossa solução consegue garantir uma alta taxa de entrega de pacotes, diminuir a latência e reduzir o atraso de entrega dos pacotes. A solução foi comparada com o WHISPER, presente na literatura e também voltado à entrega de dados para o nó sink em alta velocidade.
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Rabello, Junior Solon Andrade. "CoolEdu: um modelo multiagente para colaboração em ambientes descentralizados de educação ubíqua." Universidade do Vale do Rio do Sinos, 2010. http://www.repositorio.jesuita.org.br/handle/UNISINOS/2286.
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Previous issue date: 19Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O uso crescente de dispositivos móveis e a ampla difusão de redes sem fio vêm estimulando as pesquisas relacionadas com computação móvel e ubíqua. Neste contexto, a educação vem sendo considerada uma das principais áreas de aplicação. O acompanhamento da mobilidade do aprendiz, através de sistemas de localização e o suporte à ciência de contexto, possibilitam a descoberta de novas oportunidades educacionais. Atualmente existem diversas propostas para a organização de ambientes de educação ubíqua, embora a maioria utilize uma arquitetura centralizada. Essa abordagem, apesar de trazer benefícios como a facilidade de acesso aos dados dos aprendizes, tem desvantagens intrínsecas ao seu modelo, como a preocupação com a escalabilidade e a separação física entre o aprendiz e os seus dados de perfil. Como alternativa às abordagens centralizadas, este trabalho propõe um modelo de colaboração para ambientes descentralizados, que, baseado no modelo sócio-interacionista e na abordagem de agentes, auxilia no processo de a
The recent use of mobile devices and the widespread adoption of wireless computer networks have stimulated mobile and ubiquitous computing research. In this context, education is being considered one of the main application areas. The ability to accurately track the learner’s position through a location system and the context awareness support allow the discovery of new pedagogical opportunities. Nowadays, there are several approaches to the organization of ubiquitous computing environments, even if the majority of them employ a centralized architecture. This approach brings some benefits, like easing the access to the learner profiles, but it also has some disadvantages intrinsic to the model, like scalability concerns and the physical separation between the learners and their profile data. This work proposes a collaboration model created for decentralized environments, capable of improving the learning process through the stimulus to the interaction between learners. This approach is modeled using agents, e
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Alduwailah, Fahed Yousef. "Impact of CRM resources and capabilities on business performance in the mobile telecommunications industry : a resource-based view." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/17142.
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Organisations are becoming increasingly aware of the necessity to maintain sustainable long-term relationships with customers in order to survive in the global competition. They are also aware that the changing needs and purchase patterns of customers requires them to choose differentiated customer-oriented marketing strategies so as to acquire a competitive advantage over their rivals and enhance their business performance. Customer Relationship Management (CRM) enables organisations to create and manage relationships with customers more effectively through a detailed and accurate analysis of consumer data using various information technologies. Several CRM theories like the resource-based view (RBV), and theories of institutions, cultures, entrepreneurship, and dynamic theory can help a company gain over competitors. If implemented appropriately, the CRM approach can help a firm with managerial efficiency, cost reduction, enhanced customer services, and increased sales and profits. The present study aims to develop a novel and comprehensive model to measure the effect of CRM resources over CRM capabilities and the effects on business performance. The present study covers infrastructural and cultural CRM resources with CRM capabilities. The results are based on information collected from three Kuwaiti mobile network operators using a questionnaire in adherence with ethical guidelines. The study measures business performance comprehensively from financial and marketing perspectives using regression analysis to determine if there is a mediation role between two variables. The results show that CRM infrastructural resources positively and directly affect CRM capabilities. However, the effect of customer and learning orientation cultures on CRM capabilities is considerably stronger than that of infrastructural resources. The study also reveals that CRM capabilities significantly and positively affect business performance from marketing and financial standpoints although the effect on marketing performance was stronger.
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Churchill, Diana A. "Investigating Trophic Interactions of Deep-sea Animals (Sharks, Teleosts, and Mobile scavengers) in the Gulf of Mexico Using Stable Isotope Analysis." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2214.
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The deep-sea is the largest habitat on earth, containing over 90 percent of the world’s oceans and home to over 20,000 species. Deep-sea ecosystems are increasingly impacted by human activities including fishing and oil extraction. To understand potential impacts on deep-sea food webs, it is crucial to gather baseline data in these systems. I quantified the trophic interactions of three groups of deep-water animals across a range of trophic levels living in the northern and eastern Gulf of Mexico using stable isotope analysis. First, I propose methods for correcting δ15N values for the presence of nitrogenous metabolic waste products (e.g., urea) in muscle tissue using chemical extractions and/or species-specific mathematical normalizations. Significant differences in δ15N, %N, and C:N values as a result of extractions were observed in eight of ten shark and all three hagfish species. The δ15N values increased, but shifts in %N and C:N values were not unidirectional. Mathematical normalizations for δ15N values were successfully created for four shark and two hagfish species. I then describe the trophic interactions of three consumer assemblages. Carbon isotopic values indicate a heavy reliance on allochthonous nutrient inputs from surface waters. Nitrogen isotopic values reveal somewhat atypical taxa as top predators in the deep sea. Shark, teleost, and invertebrate species across a wide range of body sizes are feeding at a similar trophic level. This apparent lack of size structuring could be the result of a high degree of opportunistic scavenging or perhaps feeding at many trophic levels simultaneously in an oligotrophic system. There was a high degree of isotopic niche overlap among species within each consumer assemblage, perhaps the result of limited nutrient resources in the deep-sea. In general, individuals from the northern sampling stations displayed higher δ13C and δ15N values than those from the eastern sites. With the exception of a few species, there were no strong relationships between body size and isotopic values. The present study is among the first characterizations of the trophic structure of deep-sea organisms in the Gulf of Mexico and establishes system baselines for future studies describing deep-water systems and investigating anthropogenic impacts.
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Nichele, Aline Grunewald. "Tecnologias móveis e sem fio nos processos de ensino e de aprendizagem em Química: uma experiência no Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul." Universidade do Vale do Rio dos Sinos, 2015. http://www.repositorio.jesuita.org.br/handle/UNISINOS/3754.
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Aline Grunewald Nichele.pdf: 5451607 bytes, checksum: a9009a738e834f402fde486dd9c646cb (MD5)Made available in DSpace on 2015-06-03T12:07:50Z (GMT). No. of bitstreams: 1 Aline Grunewald Nichele.pdf: 5451607 bytes, checksum: a9009a738e834f402fde486dd9c646cb (MD5) Previous issue date: 2015-02-25
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Motivada pela crescente utilização de diferentes tecnologias móveis e sem fio (TMSF), principalmente smartphones e tablets, entre os estudantes, bem como pela política pública de inserção de tablets no contexto das escolas públicas, surge o problema dessa pesquisa, que consiste em investigar como as TMSF podem contribuir para os processos de ensino e de aprendizagem em Química na perspectiva do mobile learning e do “Bring Your Own Device” (BYOD) no contexto da formação inicial de professores no Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul (IFRS) – Campus Porto Alegre. A pesquisa tem como objetivo principal compreender como as TMSF podem contribuir para os processos de ensino e de aprendizagem em Química na perspectiva do mobile learning e do BYOD, a fim de potencializar o desenvolvimento de práticas pedagógicas no contexto da formação inicial de professores no IFRS – Campus Porto Alegre. São também objetivos da pesquisa: a) identificar elementos que permitam compreender quem são os licenciandos em Ciências da Natureza do IFRS, principalmente no que se refere ao acesso e utilização das tecnologias digitais (TD); b) buscar e selecionar os aplicativos para tablets e smartphones, disponíveis em loja digital virtual, com potencial para os processos de ensino e de aprendizagem em Química; c) estabelecer critérios de avaliação para os aplicativos, que possibilitem conhecê-los e classificá-los em termos de aplicabilidade; d) conceber, desenvolver e avaliar prática pedagógica em Química utilizando aplicativos para tablets e smartphones, no contexto do mobile learning e do BYOD. Em função das características do problema de pesquisa, bem como dos objetivos a serem alcançados, optou-se pelo desenvolvimento de uma pesquisa exploratória, de natureza qualitativa e quantitativa, baseada em Design Research, em que o artefato foi uma prática pedagógica desenvolvida por meio de uma atividade complementar junto a um grupo de dez estudantes da Licenciatura em Ciências da Natureza: Habilitação em Biologia e Química do IFRS – Campus Porto Alegre. Como instrumentos e materiais, utilizou-se: questionários, “roda de conversas”, entrevista semi-estruturada, registros em áudio, fotos, vídeo e observação. Para a análise de dados, utilizou-se a Análise Textual Discursiva (GALIAZZI; MORAES, 2011). Para interpretação dos dados e melhor compreensão do problema e objetivos da pesquisa, buscou-se fundamentação teórica nos seguintes autores: Galiazzi, Moraes (2002); Saccol, Schlemmer & Barbosa (2010); Lemos (2003); Giordan (2008). Os principais resultados da pesquisa apontam que os licenciandos têm um amplo acesso às tecnologias digitais e à internet, entretanto seu uso era basicamente restrito a comunicação. Há diversos aplicativos para tablets e smartphones específicos para a área de Química disponíveis em lojas digitais virtuais, bem como aplicativos gerais que tem potencial para o desenvolvimento de práticas pedagógicas, entretanto, após estabelecimento de critérios e avaliação desses foram selecionados aplicativos que fossem gratuitos, multiplataforma, com conteúdo preferencialmente em língua portuguesa e que esse fosse de qualidade. A partir do perfil tecnológico dos licenciandos e dos aplicativos selecionados foi concebida uma prática pedagógica na perspectiva do mobile learning e do BYOD, desenvolvida por meio de uma atividade complementar, em que os participantes vivenciaram as TMSF no contexto educacional e desenvolveram projetos de aprendizagem de Química no âmbito das TMSF.
Motivated by the increasing use of different mobile and wireless technologies, especially smartphones and tablets among students as well as the public policy of tablets insertion in the context of public schools, this research investigates how mobile and wireless technologies may appear to contribute to the processes of teaching and learning Chemistry from the perspective of mobile learning and BYOD in the context of initial teacher training in IFRS - Campus Porto Alegre. The research aims to understand how mobile and wireless technologies can contribute to the processes of teaching and learning Chemistry from the perspective of mobile learning and BYOD in order to enhance the development of educational practices in the context of initial teacher training in IFRS - Campus Porto Alegre. Some other objectives of the research are: a) to identify the Natural Sciences undergraduates’ digital technological profile, mainly with regard to the access and use of digital technologies ; b ) to search and select the applications for tablets, with potential for the teaching and learning processes in Chemistry, available in virtual digital store; c ) to establish evaluation criteria for the Apps in order to know them and classify them in terms of applicability; d ) to design, develop and evaluate pedagogical practice in Chemistry with applications for tablets and smartphones in the context of mobile learning and BYOD. Taking into consideration the different characteristics of the research problems achieved, we opted for the development of an exploratory research, qualitative and quantitative, based on Design Research, where the artifact was a pedagogical practice developed through a complementary activity with a group of ten undergraduates. The instruments and materials which have been used are: questionnaires, “workshops”, interviews, audio recordings, photos, video and observation. For data analysis, we used the text analysis discourse (GALIAZZI; MORAES, 2011). In order to interpret the data and for better understanding of the problem and research objectives, we sought theoretical foundation in the following authors: Galiazzi, Moraes (2002); Saccol, Schlemmer & Barbosa (2010); Lemos (2003); Giordan (2008). The main results of this research show that the licensees have broad access to digital technologies and the Internet, but its use was basically restricted to communication. There are several Apps for specific tablets and smartphones concerning Chemistry education, and general applications that have potential for the development of teaching practices available on virtual digital stores. However, after establishing criteria and evaluation of these Apps we selected some of them which were free, multiplatform, and with contents preferably in Portuguese. A pedagogical practice was designed from the technological profile of undergraduates and from selected applications considering the perspective of mobile learning and BYOD developed through a complementary activity. In that complementary activity the participants experienced the mobile and wireless technologies in the educational context and developed Chemistry learning projects in the context of mobile and wireless technologies.
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Kosen, Emre. "Design And Implementation Of Mobile Patient Data Collection And Transmission System For An Emergency Ambulance." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604970/index.pdf.
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In this thesis, a low-cost system, called Mobile Ambulance, is designed and implemented that provides patient&rsquos medical data collection and transmission from a moving ambulance. The aim of the system is to decrease the waiting time for critical care patients to be seen at the emergency department (ED) at the same time to equip the emergency physician with the essential medical data before the patient arrives the ED. Mobile Ambulance is a multi-tiered distributed application composed of three components: ambulance component to capture patient&rsquo
s essential medical data (EMD) and to transmit it to the ED (transmission is wireless via General Packet Radio Service, GPRS), synchronization component (synch for short) to persist incoming data into the back-end database and to warn the emergency physician, and service component to analyze the patient&rsquo
s EMD.
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Santos, Frederico Miguel do Céu Marques dos. "Architecture for real-time coordination of multiple autonomous mobile units." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13969.
Full textAbstract:
Doutoramento em Engenharia ElectrotécnicaInterest on using teams of mobile robots has been growing, due to their potential to cooperate for diverse purposes, such as rescue, de-mining, surveillance or even games such as robotic soccer. These applications require a real-time middleware and wireless communication protocol that can support an efficient and timely fusion of the perception data from different robots as well as the development of coordinated behaviours. Coordinating several autonomous robots towards achieving a common goal is currently a topic of high interest, which can be found in many application domains. Despite these different application domains, the technical problem of building an infrastructure to support the integration of the distributed perception and subsequent coordinated action is similar. This problem becomes tougher with stronger system dynamics, e.g., when the robots move faster or interact with fast objects, leading to tighter real-time constraints. This thesis work addressed computing architectures and wireless communication protocols to support efficient information sharing and coordination strategies taking into account the real-time nature of robot activities. The thesis makes two main claims. Firstly, we claim that despite the use of a wireless communication protocol that includes arbitration mechanisms, the self-organization of the team communications in a dynamic round that also accounts for variable team membership, effectively reduces collisions within the team, independently of its current composition, significantly improving the quality of the communications. We will validate this claim in terms of packet losses and communication latency. We show how such self-organization of the communications can be achieved in an efficient way with the Reconfigurable and Adaptive TDMA protocol. Secondly, we claim that the development of distributed perception, cooperation and coordinated action for teams of mobile robots can be simplified by using a shared memory middleware that replicates in each cooperating robot all necessary remote data, the Real-Time Database (RTDB) middleware. These remote data copies, which are updated in the background by the selforganizing communications protocol, are extended with age information automatically computed by the middleware and are locally accessible through fast primitives. We validate our claim showing a parsimonious use of the communication medium, improved timing information with respect to the shared data and the simplicity of use and effectiveness of the proposed middleware shown in several use cases, reinforced with a reasonable impact in the Middle Size League of RoboCup.
O interesse na utilização de equipas multi-robô tem vindo a crescer, devido ao seu potencial para cooperarem na resolução de vários problemas, tais como salvamento, desminagem, vigilância e até futebol robótico. Estas aplicações requerem uma infraestrutura de comunicação sem fios, em tempo real, suportando a fusão eficiente e atempada dos dados sensoriais de diferentes robôs bem como o desenvolvimento de comportamentos coordenados. A coordenação de vários robôs autónomos com vista a um dado objectivo é actualmente um tópico que suscita grande interesse, e que pode ser encontrado em muitos domínios de aplicação. Apesar das diferenças entre domínios de aplicação, o problema técnico de construir uma infraestrutura para suportar a integração da percepção distribuída e das acções coordenadas é similar. O problema torna-se mais difícil à medida que o dinamismo dos robôs se acentua, por exemplo, no caso de se moverem mais rápido, ou de interagirem com objectos que se movimentam rapidamente, dando origem a restrições de tempo-real mais apertadas. Este trabalho centrou-se no desenvolvimento de arquitecturas computacionais e protocolos de comunicação sem fios para suporte à partilha de informação e à realização de acções coordenadas, levando em consideração as restrições de tempo-real. A tese apresenta duas afirmações principais. Em primeiro lugar, apesar do uso de um protocolo de comunicação sem fios que inclui mecanismos de arbitragem, a auto-organização das comunicações reduz as colisões na equipa, independentemente da sua composição em cada momento. Esta afirmação é validada em termos de perda de pacotes e latência da comunicação. Mostra-se também como a auto-organização das comunicações pode ser atingida através da utilização de um protocolo TDMA reconfigurável e adaptável sem sincronização de relógio. A segunda afirmação propõe a utilização de um sistema de memória partilhada, com replicação nos diferentes robôs, para suportar o desenvolvimento de mecanismos de percepção distribuída, fusão sensorial, cooperação e coordenação numa equipa de robôs. O sistema concreto que foi desenvolvido é designado como Base de Dados de Tempo Real (RTDB). Os dados remotos, que são actualizados de forma transparente pelo sistema de comunicações auto-organizado, são estendidos com a respectiva idade e são disponibilizados localmente a cada robô através de primitivas de acesso eficientes. A RTDB facilita a utilização parcimoniosa da rede e bem como a manutenção de informação temporal rigorosa. A simplicidade da integração da RTDB para diferentes aplicações permitiu a sua efectiva utilização em diferentes projectos, nomeadamente no âmbito do RoboCup.
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Barbosa, Lara Leite. "Design sem fronteiras: a relação entre o nomadismo e a sustentabilidade." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/16/16134/tde-06052010-155303/.
Full textAbstract:
A tese pretende articular nomadismo e sustentabilidade através do design. A hipótese visa a confirmar que nomadismo e sustentabilidade estão intimamente relacionados e busca entender de que maneira o designer pode incorporar estes princípios em seu processo de trabalho. Reflete sobre a questão da sustentabilidade, a partir do comportamento nômade, conforme o referencial teórico das contribuições de autores como Bernard Rudofsky, Ezio Manzini, Felix Guatari, Gilles Deleuze, Michel Maffesoli, Paul Zumthor, Robert Kronenburg, Teshome Gabriel, Victor Papanek, dentre outros, sob a ótica do design. A tese inclui resultados de entrevistas, realizadas no Brasil e no exterior, com especialistas e arquitetos que trabalham e vivenciam as temáticas pesquisadas. Contém um levantamento que se refere à identificação e análise de soluções de design para habitar um mundo onde a necessidade de se deslocar tem se tornado cada vez mais recorrente. As propostas para habitações móveis e adaptáveis vão além de categorias usuais, por isso, o design sem fronteiras atravessa os limites entre arquitetura e design por hibridismos que vagueiam entre edifíciosveículos; mobiliárioferramentas; vestuárioequipamentos. Os cinco capítulos são divididos tematicamente nas categorias: Partir; Reconhecer o Local, Conhecer os Outros; Buscar os Recursos; Definir a Duração e Retornar, oferecendo uma chave de leitura sobre a jornada nômade. O objetivo da tese é gerar diretrizes projetuais inovadoras que considerem as formas contemporâneas de vida nômade, respeitando os requisitos ambientais. Estas diretrizes são apresentadas na conclusão, como direcionamento aos designers.The thesis aims to articulate nomadism and sustainability through design. The hypothesis aims to confirm that nomadism and sustainability are closely related and tries to understand how designer can incorporate these principles in work process. It reflects about sustainability issues and nomadic behavior, accoding to the theoretical referencial of the contributions of authors such as Bernard Rudofsky, Ezio Manzini, Felix Guatari, Gilles Deleuze, Michel Maffesoli, Paul Zumthor, Robert Kronenburg, Teshome Gabriel, Victor Papanek amongst others, under the optics of design. The thesis includes results of interviews, carried through in Brazil and abroad, with specialists and architects who work and experience the thematic searched. It has a survey to identify and to analyze design solutions to inhabit a world where the necessity for dislocation has become more and more recurrent. The proposals for mobile and adaptable dwellings go beyond usual categories, therefore, design without borders crosses the limits between architecture and design to hybrid forms that wanders between buildingvehicles; furnituretools; garmentequipment. The five chapters are divided by theme in categories To go away; To recognize the place, To know the others; To catch resources; To define duration; To go back providing a range of keys for interpretation of the nomadic journey. The goal of the thesis is to generate innovative design directions that consider the contemporaries forms of nomadic life, respecting the environmental requirements. These design directions are presented in the conclusion, as suggestions for designers.
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Loménie, Nicolas. "Interprétation de nuages de points : application à la modélisaion d'environnements 3D en robotique mobile." Phd thesis, Université René Descartes - Paris V, 2001. http://tel.archives-ouvertes.fr/tel-00136113.
Full textAbstract:
Cette thèse traite de l'analyse de nuages de points 3D désorganisé et s'appuie sur deux outils : un algorithme de partitionnement efficace inspiré des C-moyennes floues d'une part, et des outils de filtrage morphologique de représentation à base de triangulation de Delaunay d'autre part. Le cadre applicatif essentiel est la navigation autonome en robotique mobile en environnement inconnu, c'est-à-dire dans modèle. Mais la méthodologie générique développée a été appliquée à d'autres types d'environnements, notamment plus structurés.
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Blair, Kevin J., Eddy R. Segura, Alex Garner, Jianchao Lai, Amy Ritterbusch, Sebastian Leon-Giraldo, Vincent Guilamo-Ramos, Jordan E. Lake, Jesse Clark, and Ian W. Holloway. "PrEP Awareness, Use, Intention to Use, and Information Source Among Geosocial Networking Application Users in Mexico in 2018–2019." Springer, 2021. http://hdl.handle.net/10757/655887.
Full textAbstract:
El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.Pre-exposure prophylaxis (PrEP) has limited availability across Latin America, though access is increasing. We explored PrEP uptake in Mexico via an online survey completed by Spanish-speaking, Hornet geosocial networking application (GSN app) users without HIV (n = 2020). Most (81.3%) had heard of PrEP, 3.5% were current users, and 34.2% intended to take PrEP within six months. Current PrEP use was associated with PrEP eligibility (aOR 26.07 [95%CI 13.05–52.09], p < 0.001), recent STI testing (aOR 3.79 [95%CI 1.10–13.11], p = 0.035), and recent chemsex (aOR 3.02 [95%CI 1.02–8.93], p = 0.046). Recent STI testing was associated with hearing about PrEP from a doctor (aOR 3.26 [95%CI 1.98–5.36], p < 0.001), and those who lived in large cities were less likely to have learned about PrEP via Hornet (aOR 0.52 [95%CI 0.32–0.85], p = 0.009). Interventions to increase PrEP uptake in Mexico should build upon existing health networks and utilize GSN apps for PrEP information dissemination, particularly in less populated areas.
University of California
Revisión por pares
45
Ode, Egena. "Making co-creation work in mobile financial services innovation : what capabilities are needed and what practices work best in developing countries?" Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/making-cocreation-work-in-mobile-financial-services-innovation-what-capabilities-are-needed-and-what-practices-work-best-in-developing-countries(0ad4071d-e58a-41f0-b1e2-50109f47aa46).html.
Full textAbstract:
This thesis addresses existing shortcomings in the co-creation literature by proposing organisational capabilities that support co-creation in financial service firms. A developing country perspective is taken and the context is Nigeria, a West African Country. In this thesis, the Resource-based view and Knowledge-based view are integrated with the Dynamic Capability perspective to identify capabilities required to manage the dyadic interactions during co-creation. First, a conceptual model is developed through an in-depth literature review, before testing, refining and validating the model through a mixed-method research approach, involving both qualitative and quantitative research steps. The conceptual model identified a set of capabilities - namely the firm's innovation, knowledge management and relational capability and their effect on co-creation practice. The aim of the qualitative research step was to improve the conceptual model through exploratory research. This step involved in-depth interviews (n=9) with key informants and a focus group discussion with users (n=7). In the quantitative step, empirical data was collected via a questionnaire (n=261) using a drop-off-pick-up (DOPU) technique. The data is analysed using structural path analysis, hypotheses testing and model re-specification. The results of the qualitative phase indicate that co-creation in financial services is dependent on regulation, user need and the structure of financial services in Nigeria. The results also confirm the influence of innovation, knowledge management and relational capabilities on co-creation practice. Nevertheless, qualitative findings also show that knowledge management capability emerged as a vital capability upon which other value creation activities in financial service firms depend. These findings were further tested and validated in the quantitative phase. In line with the resource-based view (RBV) and the knowledge-based view (KBV), empirical findings confirm that the firm`s resource endowments explain, in part, value co-creation in firms. Principally, the findings of this study show that the capacity of financial service organisations to provide sustainable value creation for its clients and itself depend on the degree to which they possess specific dynamic capabilities. The findings also show the relative importance of co-creation practices and how they are effective only in certain conditions and specific environments.
46
Ben, slimen Yosra. "Knowledge extraction from huge volume of heterogeneous data for an automated radio network management." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE2046.
Full textAbstract:
En vue d’aider les opérateurs mobiles avec la gestion de leurs réseaux d’accès radio, trois modèles sont proposés. Le premier modèle est une approche supervisée pour une prévention des anomalies. Son objectif est de détecter les dysfonctionnements futurs d’un ensemble de cellules en observant les indicateurs clés de performance considérés comme des données fonctionnelles. Par conséquent, en alertant les ingénieurs et les réseaux auto-organisés, les opérateurs mobiles peuvent être sauvés d’une dégradation de performance de leurs réseaux. Le modèle a prouvé son efficacité avec une application sur données réelles qui vise à détecter la dégradation de capacité, les problèmes d’accessibilités et les coupures d’appel dans des réseaux LTE.A cause de la diversité des technologies mobiles, le volume de données qui doivent être quotidiennement observées par les opérateurs mobiles devient énorme. Ce grand volume a devenu un obstacle pour la gestion des réseaux mobiles. Le second modèle vise à fournir une représentation simplifiée des indicateurs clés de performance pour une analyse plus facile. Du coup, un modèle de classification croisée pour données fonctionnelles est proposé. L’algorithme est basé sur un modèle de blocs latents dont chaque courbe est identifiée par ses composantes principales fonctionnelles. Ces dernières sont modélisées par une distribution Gaussienne dont les paramètres sont spécifiques à chaque bloc. Les paramètres sont estimés par un algorithme EM stochastique avec un échantillonnage de Gibbs. Ce modèle est le premier modèle de classification croisée pour données fonctionnelles et il a prouvé son efficacité sur des données simulées et aussi sur une application réelle qui vise à aider dans l’optimisation de la topologie des réseaux mobiles 4G.Le troisième modèle vise à résumer l’information issue des indicateurs clés de performance et aussi des alarmes réseaux. Un modèle de classification croisée des données mixtes : fonctionnelles et binaires est alors proposé. L’approche est basé sur un modèle de blocs latents et trois algorithmes sont comparés pour son inférence : EM stochastique avec un échantillonneur de Gibbs, EM de classification et EM variationnelle. Le modèle proposé est le premier algorithme de classification croisée pour données fonctionnelles et binaires. Il a prouvé son efficacité sur des données simulées et sur des données réelles extraites à partir de plusieurs réseaux mobiles 4GIn order to help the mobile operators with the management of their radio access networks, three models are proposed. The first model is a supervised approach for mobile anomalies prevention. Its objective is to detect future malfunctions of a set of cells, by only observing key performance indicators (KPIs) that are considered as functional data. Thus, by alerting the engineers as well as self-organizing networks, mobile operators can be saved from a certain performance degradation. The model has proven its efficiency with an application on real data that aims to detect capacity degradation, accessibility and call drops anomalies for LTE networks.Due to the diversity of mobile network technologies, the volume of data that has to be observed by mobile operators in a daily basis became enormous. This huge volume became an obstacle to mobile networks management. The second model aims to provide a simplified representation of KPIs for an easier analysis. Hence, a model-based co-clustering algorithm for functional data is proposed. The algorithm relies on the latent block model in which each curve is identified by its functional principal components that are modeled by a multivariate Gaussian distribution whose parameters are block-specific. These latter are estimated by a stochastic EM algorithm embedding a Gibbs sampling. This model is the first co-clustering approach for functional data and it has proven its efficiency on simulated data and on a real data application that helps to optimize the topology of 4G mobile networks.The third model aims to resume the information of data issued from KPIs and also alarms. A model-based co-clustering algorithm for mixed data, functional and binary, is therefore proposed. The approach relies on the latent block model, and three algorithms are compared for its inference: stochastic EM within Gibbs sampling, classification EM and variational EM. The proposed model is the first co-clustering algorithm for mixed data that deals with functional and binary features. It has proven its efficiency on simulated data and on real data extracted from live 4G mobile networks
47
Seo, Carlos Eduardo. "Analise comparativa entre protocolos de camada MAC para redes ad-hoc sem fio." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259679.
Full textAbstract:
Orientadores: Michel Daoud Yacoub, Paulo CardieriDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Este trabalho visa o estudo de redes ad hoc sem ?o, em especial, os protocolos da subcamada MAC do modelo OSI. Neste tipo de rede sem controle centralizado, o acesso ao meio se torna uma parte crítica no processo de comunicação entre terminais. Assim sendo, a principal motivação deste trabalho é investigar como os protocolos da subcamada MAC podem afetar o desempenho da rede do ponto de vista das aplicações, em especial, tráfego VoIP e de dados. Para tal, foram feitas análises comparativas entre diversos protocolos, baseadas em resultados de simulações feitas no simulador de redes ns2. Tais resultados mostram que a maior parte das alternativas ao protocolo padrão IEEE 802.11 ainda precisam amadurecer para que possam tornarse comercialmente viáveis. Um protocolo, no entanto, se destaca dos demais em cenários de tráfego misto (voz e dados), apresentando melhoria de desempenho em relação ao IEEE 802.11: o IEEE 802.11e, variante do IEEE 802.11 com funções de suporte a QoS
Abstract: This work presented here is focused on studying ad hoc wireless networks, in particular, the MAC sublevel protocols from the OSI reference model. In these networks, the lack of a centralized control makes the medium access control a critical part in the communication process between network terminals. Thus, the main objective of this work is to investigate how the MAC sublevel protocols may interfere in network performance from the application point of view, in particular, VoIP and data transmission. In order to accomplish this goal, several comparative analysis between protocols have been made, based on simulation results from the ns2 network simulator. The results show that the alternatives to the IEEE 802.11 standard suggested so far aren¿t mature enough to be commercially viable, although there is one protocol that is very promising: the IEEE 802.11e, a variant of IEEE 802.11 with QoS support functions
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
48
Luiz, Daniel Frazão. "Uma política de descarte baseada em cobertura em redes de sensores sem fio com conexão disruptiva." Universidade Federal do Amazonas, 2014. http://tede.ufam.edu.br/handle/tede/4138.
Full textAbstract:
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Many applications in Wireless Sensor Networks (WSNs) consider remote and large scale monitoring. For those scenarios, the whole network is hardly fully connected all the time. A possible vision is the union of WSNs and Disruptive Tolerant Network(DTNs) concepts, where mobile nodes make collect data in sparse networks and deliver them to a base station. This work presents a buffer management strategy, which is a basic principle in DTN networks. The proposed solution considers the global coverage to choose which messages are dropped, therefore, minimizing the impact on monitoring application. Such solution is important for WSNs applications with limited resources. We show through simulation that the proposed Coverage-Based Drop-Policy in Wireless Sensor Network with Disruptive Connections (CBDP) improves the network coverage compared to traditional DTN drop policies like Drop Last (DL) and Drop First (DF).
Sensores Sem Fio (RSSFs) consideram o monitoramento de localidades afastadas, de difícil acesso e em larga escala. Para tais cenários, é difícil imaginar que todos os segmentos da rede estão interconectados ou têm conectividade direta com uma central de processamento. Uma visão possível é o uso conjunto dos conceitos de RSSFs e redes tolerantes a desconexões (DTNs - Disruptive-tolerant networks), em que nós móveis podem ser responsáveis por coletar dados de redes esparsas e entregá-los a um ponto central. Esta dissertação apresenta uma estratégia de gerenciamento de buffers, que é uma das funções fundamentais das DTNs. A solução proposta baseia-se no cálculo da cobertura para o descarte de pacotes de dados que menos contribuam para a cobertura global do sistema, favorecendo sua aplicação em redes de sensores com recursos limitados mas de alta escala. Através de simulações, mostramos que a Política de Descarte Baseada em Cobertura (CBDP) melhora a cobertura da rede em comparação às políticas de descarte normalmente encontradas nas DTNs, como Drop Last (DL) e Drop First (DF).
49
Gouvêa, Conrado Porto Lopes 1984. "Software implementation of cryptography for wireless sensors and mobile processors = Implementação em software de criptografia para sensores sem fio e processadores móveis." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/275612.
Full textAbstract:
Orientador: Julio César López HernándezTese (doutorado) - Universidade Estadual de Campinas, Instituto de Computação
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Resumo: A implementação eficiente e segura de esquemas criptográficos é um aspecto importante da criptografia aplicada. Neste trabalho, foca-se na implementação em software de algoritmos relevantes da criptografia de curvas elípticas (CCE), criptografia baseada em emparelhamentos (CBE), e de cifração autenticada (CA). Duas plataformas computacionais modernas foram utilizadas: o microcontrolador MSP430, bastante utilizado em redes de sensores sem fio, e o processador ARM, amplamente empregado por dispositivos móveis como smartphones e tablets que estão se tornando cada vez mais populares. Técnicas para a melhoria de desempenho em software utilizando conjuntos de instruções, periféricos e melhorias algorítmicas são descritas. A implementação segura, cujo objetivo é prevenir certos ataques de canais secundários, também é estudada e novas técnicas são providas para reduzir seu impacto na velocidade em processadores ARM. Tais resultados contribuem para a construção eficiente e segura de sistemas criptográficos em sensores sem fio e processadores móveis
Abstract: The efficient and secure implementation of cryptographic schemes is an important aspect of practical cryptography. In this work, we focus on the software implementation of relevant algorithms in elliptic curve cryptography (ECC), pairing-based cryptography (PBC) and in authenticated encryption (AE). Two modern computational platforms were targeted: the MSP430 microcontroller often used in wireless sensor networks, and the ARM processor, widely employed in mobile devices such as smartphones and tablets which are increasingly becoming ubiquitous. Techniques for improving the software performance by taking advantage of instruction sets, peripherals and algorithmic enhancements are described. The secure implementation, which aims at thwarting common side-channel attacks, is also studied and new techniques are provided for improving its efficiency on ARM processors. These results contribute to the building of efficient and secure cryptographic systems on wireless sensors and mobile processors
Doutorado
Ciência da Computação
Doutor em Ciência da Computação
50
Seko, Murilo Hiroaki. "Antenas planares de micro-ondas multibandas para terminais móveis de sistemas de comunicação sem fio." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-31072013-002544/.
Full textAbstract:
Neste trabalho, foram desenvolvidas antenas planares de micro-ondas multibandas para aplicação em terminais móveis de sistemas de comunicação sem fio. Foi realizado um estudo sobre antenas planares de micro-ondas, com ênfase em técnicas de projeto que possibilitam a operação das mesmas em bandas largas e em múltiplas bandas. A partir dos conhecimentos adquiridos com esse estudo, foram propostas configurações de antenas para terminais móveis de sistemas atuais de telefonia móvel, de WLAN e de WPAN, sistemas esses que têm experimentado nos últimos anos uma grande popularização mundial. Por meio de um procedimento de projeto auxiliado por simulação eletromagnética computacional, as configurações propostas de antenas foram analisadas e otimizadas, visando atender às especificações de projeto estabelecidas para operação nos sistemas mencionados. O desempenho que pode ser obtido com essas configurações de antenas depende de diversos parâmetros geométricos das mesmas, resultando em flexibilidade de projeto para obtenção das bandas de operação desejadas. Protótipos das antenas projetadas foram construídos e caracterizados para validar as configurações propostas de antenas e o procedimento de projeto empregado. Foram desenvolvidas quatro antenas para operação em sistemas de telefonia móvel, de WLAN e de WPAN empregados no Brasil, na Europa e nos EUA: uma antena planar em F-invertido tri-band com configuração original para operação nas bandas dos padrões GSM, DCS e PCS; uma antena planar em F-invertido penta-band com configuração original para operação nas bandas dos padrões GSM, DCS, PCS e UMTS e na banda ISM de 2.400 MHz; duas antenas quad-band, uma delas planar em F-invertido e a outra monopolo impresso com configuração original, para operação nas bandas ISM de 2.400 MHz e de 5.800 MHz e nas bandas de 5.200 MHz e de 5.600 MHz. Os resultados experimentais dos protótipos construídos apresentaram, de modo geral, boa concordância com os resultados fornecidos por simulação e mostraram que as antenas desenvolvidas atenderam às especificações de projeto para elas estabelecidas. Por meio de ambos os resultados experimentais e de simulação, o desempenho das antenas desenvolvidas pôde ser verificado, e demonstrou-se a efetividade do procedimento de projeto adotado.In this work, multi-band microwave planar antennas for application in mobile terminals of wireless communication systems were developed. A study on microwave planar antennas was performed with emphasis on design techniques that enable their operation in wide bands and multiple bands. From the knowledge gained from this study, antenna configurations for mobile terminals of current mobile telephony, WLAN and WPAN systems, which have experienced in recent years great popularity worldwide, were proposed. By means of a design procedure aided by computer electromagnetic simulation, the proposed antenna configurations were analyzed and optimized in order to meet the design specifications established for operation in the afore mentioned systems. The performance that can be obtained with these antenna configurations depends on their several geometric parameters, resulting in design flexibility for obtaining the desired operation bands. Prototypes of the designed antennas were fabricated and characterized to validate the proposed antenna configurations and the design procedure employed. Four antennas were developed for operation in mobile telephony, WLAN and WPAN systems employed in Brazil, Europe and USA: a tri-band planar inverted-F antenna with novel configuration for operation in GSM, DCS and PCS standard bands; a penta-band planar inverted-F antenna with novel configuration for operation in GSM, DCS, PCS and UMTS standard bands and 2,400 MHz ISM band; two quad-band antennas, one of them planar inverted-F and the other printed monopole with novel configuration, for operation in 2,400 MHz and 5,800 MHz ISM bands and 5,200 MHz and 5,600 MHz bands. The experimental results from the fabricated prototypes exhibited, in general, good agreement with the results provided by simulation and showed that the developed antennas met the specifications established for them. By means of both simulation and experimental results, the performance of the developed antennas could be verified, and the effectiveness of the design procedure adopted was demonstrated.