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Dissertations / Theses on the topic 'Cellular telephones'
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1
Ho, Ming-Ju. "System deployment and capacity enhancing techniques for mobile radio." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/14816.
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Kchao, Camroeum. "Direct sequence spread spectrum cellular radio." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/13719.
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Landron, Orlando. "Microwave multipath resolution in microcellular channels." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-03032009-040639/.
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Caffery, James Joseph Jr. "Wireless location in CDMA cellular radio systems." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15504.
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Van, Wyk Daniel Jacobus. "Four-dimensional Q2PSK modulation and coding for mobile digital communication." Pretoria : [s.n.], 2000. http://upetd.up.ac.za/thesis/available/etd-10272005-122450.
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Wang, Li-Chun. "Channel modeling and architecture for cellular-based personal communications." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/13716.
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Parameswaran, Subramanian T. "Software for site specific propagation prediction." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06232009-063433/.
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Tannenbaum, Robert (Robert Peter) Carleton University Dissertation Management Studies. "Cellular telephones; a comparative analysis of their adoption and impacts." Ottawa, 1991.
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Berriman, Paul. "The marketing of cellular mobile radio telephones in Hong Kong." Thesis, [Hong Kong : University of Hong Kong], 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12316933.
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Wu, Jianjun. "Adaptive equalisation techniques for future mobile communications." Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338815.
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Joung, Jinsoup. "Cochannel interference canceling receivers for TDMA systems." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/21806.
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Wu, Sun John. "Mobile phone handset strategies of market leaders in Hong Kong /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20604555.
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Phongphanphanee, Chai. "Multilayer mobile communication systems." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324001.
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Sivanesan, Kathiravetpillai. "A study of performance for M-ary DS/CDMA cellular mobile radio systems." Click to view the E-thesis via HKUTO, 1999. http://sunzi.lib.hku.hk/hkuto/record/B42575333.
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Ghaziasgar, Mehrdad. "The use of mobile phones as service-delivery devices in sign language machine translation system." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_7216_1299134611.
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<p>This thesis investigates the use of mobile phones as service-delivery devices in a sign language machine translation system. Four sign language visualization methods were evaluated on mobile phones. Three of the methods were synthetic sign language visualization methods. Three factors were considered: the intelligibility of sign language, as rendered by the method<br>the power consumption<br>and the bandwidth usage associated with each method. The average intelligibility rate was 65%, with some methods achieving intelligibility rates of up to 92%. The average le size was 162 KB and, on average, the power consumption increased to 180% of the idle state, across all methods. This research forms part of the Integration of Signed and Verbal Communication: South African Sign Language Recognition and Animation (SASL) project at the University of the Western Cape and serves as an integration platform for the group's research. In order to perform this research a machine translation system that uses mobile phones as service-delivery devices was developed as well as a 3D Avatar for mobile phones. It was concluded that mobile phones are suitable service-delivery platforms for sign language machine translation systems.</p>
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Fung, Victor. "Bit error simulation of FSK, BPSK, and pi/4 DQPSK in flat and frequency-selective fading mobile radio channels using two-ray and measurement- based impulse response models." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08142009-040410/.
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Alhinai, Yousuf Salim. "The adoption of advanced mobile commerce services by individuals : investigating the impact of the interaction between the consumer and the mobile service provider /." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/6748.
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Ecker, Katelyn D. "Mobile phones as a social medium for the deaf : a uses and gratifications study /." Online version of thesis, 2008. http://hdl.handle.net/1850/7098.
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Striglis, Stavros. "A multistage RAKE receiver for CDMA systems." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/42211.
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This thesis proposes a multistage RAKE receiver for use at the base station of a Code Division Multiple Access (CDMA) cellular communications system. This receiver combines the interference rejection capability of multiuser receivers with the robust performance of a RAKE receiver in the presence of multipath interference. Unlike previous multiuser receiver designs, this multistage RAKE receiver requires no a priori information about the time-vary multipath radio channel.
The thesis presents a mathematical description of the multistage receiver, and a software simulation of the receiver performance. A wide range of channel models are considered which include the effects of Gaussian noise, multipath propagation, imperfect power control and multiple access interference for the reverse link CDMA channel. Under a wide range of conditions, the multistage RAKE receiver is able to support two to three times as many users as a conventional single stage RAKE receiver. The receiver is also shown to be robust to the near-far problem.<br>Master of Science
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Botha, Adele. "The use of mobile phones to mediate a design experiment in a secondary school." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-02082007-002731/.
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Hamblin, Denise Lee. "The effect of mobile phone emitted electromagnetic fields on human brain activity and performance." Australasian Digital Thesis Program, 2006. http://adt.lib.swin.edu.au/public/adt-VSWT20061110.100936.
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Thesis (PhD) - Swinburne University of Technology.<br>Thesis for Doctor of Philosophy, Brain Sciences Institute, Faculty of Life and Social Sciences, Swinburne University of Technology - 2002. Typescript. Includes bibliographical references (p. 137-160).
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Gong, Jun. "Improved text entry for mobile devices alternate keypad designs and novel predictive disambiguation methods : a dissertation /." View dissertation online, 2007. http://hdl.handle.net/2047/d10016090.
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Mooney, Aaron Michael. "Usability Evaluation of Notebook Computers and Cellular Telephones Among Users with Visual and Upper Extremity Disabilities." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33962.
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Information appliances such as notebook computers and cellular telephones are becoming integral to the lives of many. These devices facilitate a variety of communication tasks, and are used for employment, education, and entertainment. Those with disabilities, however, have limited access to these devices, due in part to product designs that do not consider their special needs. A usability evaluation can help identify the needs and difficulties those with disabilities have when using a product and universal design principles can then be applied to enhance accessibility and usability. This study addresses the usability of two of the most common information appliances - notebook computers and cellular telephones.
The usability of notebook computers was evaluated using a remote ethnographic method where participants recorded usability-related critical incidents. Participants included those with a wide range of abilities, such as legal blindness, total blindness, and upper extremity physical disabilities. Objective and subjective measures were used to determine the effects of several specific design parameters for cellular telephones.
The notebook computer study revealed that participants have difficulty with non-standard keyboard layouts, the use of isometric pointing devices, case latches, and inadequate system feedback. User performance and ratings in the cellular telephone study were the best with the 12 mm lateral pitch and 0.7 mm key height, while the fewest task failures were committed using the 0.5 mm keystroke. Participants also preferred telephone models with large <Power>, <Send> and <End> keys located in prominent locations, and 22-point and 36-point display fonts. These results were used to generate product-specific design guidelines that can be used to design notebook computers and cellular telephones that are more usable and accessible for users with visual and upper extremity physical disabilities. Universal design implications are also discussed.<br>Master of Science
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Tran, Thuy Thomas. "Propagation prediction for PCS design in urban microwave channels." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-03042009-040358/.
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Pendyala, Chandra Mohan. "On the optimal location of transmitters for micro-cellular radio communication system design." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040406/.
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Bais, Viraj Kumar. "Simulation of multistage detector for spread-spectrum applications." Master's thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12232009-020220/.
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Brown, Rowena. "Mobile phone communication in romantic relationships : the role of individual differences and relational uncertainty on text message communication outcomes /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19746.pdf.
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Schwenke, Freddie. "Access channels for mobile banking applications : a comparative study based on characteristics." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1383.
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Thesis (MTech (Information Technology))--Cape Peninsula University of Technology, 2009<br>The objective of this research project was to provide an answer to the question: 'Which access channel is the most appropriate for mobile applications?' This question is posed by providers of mobile banking services and providers of mobile banking applications alike.
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Li, Yingjie. "Bit error rate simulation of a CDMA system for personal communications." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07282008-135717/.
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Lichtenstein, Joseph. "Low computational complexity bit error rate simulation for personal communications systems in multipath and fading environments." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06102009-063138/.
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Broege, Stephanie, and n/a. "Mobile New Zealand : a multi-method comparative study of cell phone use." University of Otago. Department of Media, Film and Communication Studies, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080819.150246.
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Worldwide use of mobile phones has created a new basis for interpersonal communication and has become a ubiquitous feature of youth culture. Hence the examination of global mobile phone adoption is a global challenge for communication researchers as well as for the media industries. Thus far, New Media research in New Zealand (NZ) has focused on children and teenagers. The group of young adults between 18-25 years has rarely been surveyed. This thesis focused on university students� use of mobile communication in NZ in the context of their everyday practices. The Mobile Media Study (MMS) was designed as a cross-national comparative research project with a focus on NZ together with one European and one North American country. The usage behavior, experiences, attitudes, and opinions of young NZers� towards mobile phone use was examined and contrasted to young German and American students. Methodological and data triangulation was applied and data was collected at the University of Otago, the City University of New York, the Pennsylvania State University, and the University of Leipzig. MMS survey research was conducted along with focus group and personal interviews, and qualitative exercises. In addition, the latest data from a longitudinal study of New Media use in Germany, the US and NZ served as a secondary, comparative, and complementary dataset.
The research questions focused on general mobile phone use, text-messaging (SMS), the acceptance of Third Generation (3G) cell phones, mobile phone use in public places, gender-specific usages, and the construction of mobile social networks. Altogether, data from 1,316 students at four universities in three countries was analyzed. Results indicated that the number of providers as well as tariff structures appear to influence mobile phone adoption within a country. To adjust to the duopoly situation young people in NZ preferred prepaid cards in connection with a SMS package. This was reflected by extraordinarily high use of SMS in NZ. By comparison German and American students preferred annual contracts. Americans, who had the strongest preference for mobile calling, also had the highest monthly expenses. Additionally, findings revealed that overall user interest in 3G services is not yet very high. It was found that in particular NZ students do not exploit the full range of mobile services already available to them and feel confident that their current cell phone gratifies all their needs. They concentrate on using basic functions, such as calling and SMS. In addition, results suggest a decreasing role of the landline telephone and email for interpersonal communication.
Gender differences were found with NZ women in particular being most enthusiastic about SMS. German men had the most negative attitude toward SMS and also used the service the least in comparison to the other students surveyed. In general women had a preference for the communicative functions on their mobile phone including voicemail and more women than men in Germany and NZ were found to play mobile phone games. Finally, evidence of gender specific social network structures were found in NZ with male networks resembling spider webs while female networks were centered so that all persons in the network connected back to the center. Overall, students only used a fraction of the contacts in their mobile phone book and communicated mostly within a limited local area. In conclusion, a replication of the MMS was suggested along with further multi-method research in the field of Asian-NZer�s New Media use.
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Kong, Wei Chao. ""It is mine, it is me!" : the use of mobile phones of young people in Macau and Guangzhou." Thesis, University of Macau, 2007. http://umaclib3.umac.mo/record=b1874201.
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Goetz, Marieta. "Mobile business models in African rural communities." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2581.
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Thesis (MPhil (Information Science))--University of Stellenbosch, 2009.<br>Mobile telephone subscription in developing countries has increased by more than 500
percent since 2005, with Africa experiencing the highest growth rate globally. Amongst
Africa’s 306.5 million subscribers, recorded in 2008, an unexpectedly high adoption rate of
the technology by poor, often illiterate rural communities is observed. Mobile telephony
generally provides African rural users access to electronic communication for the first time.
Providing access to communication, information and knowledge, mobile phones present a
platform for economic and social interaction in rural Africa. The extent of the resulting
positive socio-economic impact on the developing world has lead to mobile telephony
increasingly being viewed as a potential development tool for the socio-economic upliftment
of the rural poor.
This thesis is inspired by the potential for value creation to end users of mobile telephony,
leading to the proposition that the rapid expansion of mobile telephony in rural Africa can
contribute significantly to the sustainability of these communities’ rural livelihoods. For this
proposition to be valid, mobile telephony has to provide value beyond being communication
tool. It has to provide value in income generating activities by increasing opportunities for
access to financial and social capital with mobile business models appropriate to the rural
African context.
To assess the appropriateness of mobile value offerings, the rural African context was
analyzed using the Sustainable Livelihoods Framework. Through multi-level analysis, the
challenges and issues that influence the lives of the rural poor were explored and the
dominant livelihood strategies in terms of income generating activities were identified. Apart
from agricultural income streams, waged labor, migration and micro-entrepreneurial
activities provide non-agricultural income streams.
Creating an appropriate mobile business ecosystem for rural Africa requires the collaboration
of a complex network of actors within a value constellation to co-produce value for the end
users. Three conditional factors were identified for mobile telephony and emerging mobile
business models to contribute successfully to sustainable livelihoods: adaptation of the
technology by providers, user appropriation to make the technology their own and the
assimilation of it into their livelihood strategies. These factors were researched for validation through the study of existing literature and reported case studies. It was found that these three
conditional factors were unequivocally met.
Firstly, the mobile telecommunication industry active in Africa is seen to successfully adapt
and innovate solutions that are relevant to African rural communities’ vulnerabilities and
livelihood strategies. Secondly, African mobile phone users have successfully adopted and
appropriated mobile telephony to create value for themselves in their livelihood strategies,
often independent of external interventions. They are claiming ownership of the technology
and not merely using it as a communication tool. Thirdly, by assimilating mobile telephony
into their livelihood strategies, value-creation within their income generating activities have
been made possible. This value creation is impacting users’ social and financial capital
positively.
This thesis concludes that mobile telephony and emerging mobile business models are
contributing to increasing African rural dwellers’ income generating potential, reducing their
vulnerability to shocks, and providing them with a voice; thereby contributing to sustainable
rural livelihoods.
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Duma, Lindokuhle Sifso. "An authoring tool for generalised scenario creation for SignSupport." University of the Western Cape, 2016. http://hdl.handle.net/11394/6224.
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Magister Scientiae - MSc (Computer Science)<br>This thesis describes the development cycles of an authoring tool that generalises scenario
creation for SignSupport. SignSupport is a mobile communication tool for Deaf people that
currently runs on an Android smartphone. The authoring tool is computer-based software
that helps a domain expert, with little or no programming skills, design and populate a
limited domain conversation scenario between a Deaf person and a hearing person, e.g., when
a Deaf patient collects medication at a hospital pharmacy or when a Deaf learner is taking
a computer literacy course. SignSupport provides instructions to the Deaf person in signed
language videos on a mobile device. The authoring tool enables the creation and population
of such scenarios on a computer for subsequent 'playback' on a mobile device. The output
of this authoring tool is an XML script, alongside a repository of media les that can be
used to render the SignSupport mobile app on any platform. Our concern was to iteratively
develop the user interface for the authoring tool, focusing on the domain experts who create
the overall
flow and content for a given scenario. We had four development iterations, where
the rst three were evaluated for usability; for both pharmacy and ICDL course scenarios
with purposive sampling. The fourth iteration focused on using the authoring tool to design
an ICDL practise mobile app, recording the necessary SASL videos and using an XML
parser to render the designs XML script into an Android app. The research conducted
herein leveraged multiple approaches to content authoring and generalisation; and further
that software generalisation can improve accessibility and a ordability for the ultimate end
users. The thesis concludes with a summary of recommendations and lessons learnt.
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Liu, Danyi. "Mobile phone based remote monitoring system." Click here to access this resource online, 2008. http://hdl.handle.net/10292/526.
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This thesis investigates embedded databases and graphical interfaces for the MicroBaseJ project. The project aim is the development of an integrated database and GUI user interface for a typical 3G, or 2.5G, mobile phone with Java MIDP2 capability. This includes methods for data acquisition, mobile data and information communication, data management, and remote user interface. Support of phone delivered informatics will require integrated server and networking infrastructure research and development to support effective and timely delivery of data for incorporation in mobile device-based informatics applications. A key research and development (R&D) challenge is to support effective and timely delivery of data for incorporation in mobile device-based informatics applications. Another important aspect of the project is determining how to develop efficient graphics for the small mobile screen. The research investigates and analyses the architecture of a mobile monitoring system. The project developed a generic solution that can be implemented in a number of commercial sectors, such as horticulture, building management and pollution/water management. The developed concept is tested using data relevant to the horticultural area of application. The system also addresses the main issues related to mobile monitoring, including real-time response, data integrity, solution cost, graphical presentation, and persistent storage capabilities of modern mobile devices. Four embedded databases based on J2ME have been investigated. Two of the four have been evaluated and analysed. The Insert function, Sequence Search, and Random Search of Perst List and RMS (Record Management System) databases have been tested. The size of the processed data was limited to 20,000 records when using the wireless toolkit simulator, and 11,000 records when using a mobile phone. Perst Lite reflects good performance and has out-performed RMS in all tests. User interface software such as J2ME Polish for mobile phones has been investigated. Custom J2ME class for graphical interface is developed. This provides the graphical presentation of the data collected from the sensors; including temperature, wind speed, wind direction, moisture, and leaf wetness. The graphical interface, bar charts, and line charts with trace ball for collected data have been designed and implemented. The embedded database performance and project performance have been investigated and analysed. The performances of Perst Lite and RMS are evaluated in terms of the insert, sequence search, and random search functions based on simulation and real devices. The record numbers vary from 1,000 to 20,000. The project performance contains data receiving and storage, and data presentation and configuration. The performance of data storage and configuration can be negated due to the running mode and the response time. Thus, data presenting performance is the key focus in this project. This performance was divided into the categories of initial, data search, data selection, and charting. The initial performance includes the initialisation of the project parameters, and the reaching of the welcome interface. Data search performance refers to the retrieval of the specified data from the embedded database, measured on 48 data points, which only can be presented on the mobile screen from the retrieved data. These four performance types are measured in thousands of record numbers, varying from 1,000 to 18,000 record numbers, with the retrieved data range varying from 1 day to 30 days.
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Freudenberg, Kristy. "Investigating the impact of SMS speak on the written work of English first language and English second language high school learners." Thesis, Stellenbosch : Stellenbosch University, 2009. http://hdl.handle.net/10019.1/2052.
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Thesis (MPhil (General Linguistics))--Stellenbosch University, 2009.<br>This study examined the impact of SMS speak on the written school work of English first
language (L1) and English second language (L2) high school learners. The general aims of
the study were to establish how widespread the use of SMS language is among high school
learners, and to assess whether there is any evidence of the use of features of SMS speak in
the English written work of these learners.
Eighty-eight learners from an English-Afrikaans dual medium school in a middle class
neighborhood in the Western Cape participated in this study. The participants included 43
grade 8s and 45 grade 11s, of which 51 were English L1 speakers and 37 English L2
speakers. The participants completed questionnaires from which the frequency and volume
of their SMS use was determined, as well as the features of SMS speak they reportedly use
while SMSing. In addition, samples of the learners’ English written work were examined
for specific features of SMS speak. These features included (deliberate) spelling errors,
lack of punctuation, over-punctuation, the omission of function words, the use of
abbreviation or acronyms, and the use of emoticons and rebus writing.
The results of this study indicate that high school learners are avid users of SMS and/or
MXit. All participants reported using features of SMS speak in their SMSes, and many
reported using SMS speak in their written school work. Despite this, the samples of written
work did not contain a great number of incidences of SMS speak features. It seems that the
general lack of SMS speak in the written work of these learners is a result of being able to
assess when it is and is not appropriate to use a certain variety of language: These learners
are proficient in SMS speak and use it when chatting to friends on MXit, but they can
produce written work that adheres to the formally approved standards of written high
school English. That said, a number of SMS speak features were indeed present in their
formal written work, which indicates that SMS speak had some impact on the written work
of these learners, which could in turn be attributed to the high frequency of their SMS
usage. However, not all of the non-standard features of their written English could
necessarily be attributed to the influence of SMS speak; specifically some of the spelling
and punctuation errors could be unrelated to SMS speak, as they have been noted in the
written English of high school learners from before the advent of cellphones.
The learners in this study were from a school that has a strict language policy, one which
does not tolerate the use of SMS speak in written work. Seven of the teachers completed a
questionnaire compiled for all teachers at the school in question. Responses to this
questionnaire, especially those of the language teachers, indicated that teachers either
deduct marks for features of SMS speak in written language or refuse to mark written work
that does not conform to the formally approved standards that the school has set in place. It
is possible that the actions of the teachers and the language policy of the school play a
significant role in the lack of SMS speak features in the written language use of the
learners.
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Cuba-Alvarado, Ciara-Paola. "Uso de los celulares con internet y rendimiento académico de estudiantes universitarios." Bachelor's thesis, Universidad de Lima, 2016. http://repositorio.ulima.edu.pe/handle/ulima/4761.
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El presente estudio tiene como objetivos: conocer las consecuencias del uso del Smartphone en el rendimiento académico de los estudiantes, identificar las razones que generan la necesidad de utilizar constantemente el celular, describir la influencia del Smartphone en su rendimiento académico y finalmente, identificar si el uso del Smartphone es percibido como beneficioso o perjudicial por los estudiantes en el rendimiento académico.<br>Tesis
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Oelofse, Christina Hermiena. "The learner profile of a teenage cell phone user." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-07102009-160407.
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Vaca-Morales, Dario-Pablo. "Instalación del servicio de telefonía móvil para la conectividad y desarrollo social en las localidades de Apurímac, Ayacucho y Huancavelica." Bachelor's thesis, Universidad de Lima, 2016. http://repositorio.ulima.edu.pe/handle/ulima/3201.
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En el documento "Instalación del servicio de telefonía móvil para la conectividad y desarrollo social en las localidades de Apurímac, Ayacucho y Huancavelica", se puede observar que el trabajo realizado ha podido cuantificar los efectos relacionados a esta tecnología en los beneficios sociales de la población (ahorro en costo de transportes y ahorro en tiempo) y el nivel de inversión requerido para implementarlo, por parte de los operadores privados a través del mecanismo de subvención de la inversión. Esto demuestra, como la introducción de la telefonía móvil juega un rol relevante en la reducción de la pobreza en especial la rural. Por un lado, este medio de comunicación promueve el acceso a mercados de creación de empresas, reduce los problemas de información asimétrica y sustituye la necesidad de transportarse, increment{andose la productividad y la eficiencia. Por el otro, es una herramienta que ayuda en caso de desastres, permite la difusión de información ligada a la salud y educación, y promueve la creación de capital social.<br>Trabajo de investigación
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Lu, Yun Ran. "Position mobile phone market." Thesis, University of Macau, 2000. http://umaclib3.umac.mo/record=b1636664.
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Van, Heerden Johan H. "Detecting fraud in cellular telephone networks." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50314.
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Thesis (MSc)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Cellular network operators globally loose between 3% and 5% of their annual revenue to
telecommunications fraud. Hence it is of great importance that fraud management systems
are implemented to detect, alarm, and shut down fraud within minutes, minimising
revenue loss. Modern proprietary fraud management systems employ (i) classification
methods, most often artificial neural networks learning from classified call data records to
classify new call data records as fraudulent or legitimate, (ii) statistical methods building
subscriber behaviour profiles based on the subscriber’s usage in the cellular network and
detecting sudden changes in behaviour, and (iii) rules and threshold values defined by
fraud analysts, utilising their knowledge of valid fraud cases and the false alarm rate as
guidance. The purpose of this thesis is to establish a context for and evaluate the performance
of well-known data mining techniques that may be incorporated in the fraud
detection process.
Firstly, a theoretical background of various well-known data mining techniques is
provided and a number of seminal articles on fraud detection, which influenced this thesis,
are summarised. The cellular telecommunications industry is introduced, including a brief
discussion of the types of fraud experienced by South African cellular network operators.
Secondly, the data collection process and the characteristics of the collected data are
discussed. Different data mining techniques are applied to the collected data, demonstrating
how user behaviour profiles may be built and how fraud may be predicted. An
appraisal of the performances and appropriateness of the different data mining techniques
is given in the context of the fraud detection process.
Finally, an indication of further work is provided in the conclusion to this thesis, in
the form of a number of recommendations for possible adaptations of the fraud detection
methods, and improvements thereof. A combination of data mining techniques that may
be used to build a comprehensive fraud detection model is also suggested.<br>AFRIKAANSE OPSOMMING: Sellulêre netwerk operateurs verloor wêreldwyd tussen 3% en 5% van hul jaarlikse inkomste
as gevolg van telekommunikasie bedrog. Dit is dus van die uiterse belang dat bedrog
bestuurstelsels geïmplimenteer word om bedrog op te spoor, alarms te genereer, en bedrog
binne minute te staak om verlies aan inkomste tot ’n minimum te beperk. Moderne
gepatenteerde bedrog bestuurstelsels maak gebruik van (i) klassifikasie metodes, mees
dikwels kunsmatige neurale netwerke wat leer vanaf geklassifiseerde oproep rekords en
gebruik word om nuwe oproep rekords as bedrog-draend of nie bedrog-draend te klassifiseer,
(ii) statistiese metodes wat gedragsprofiele van ’n intekenaar bou, gebaseer op die
intekenaar se gedrag in die sellulêre netwerk, en skielike verandering in gedrag opspoor,
en (iii) reëls en drempelwaardes wat deur bedrog analiste daar gestel word, deur gebruik
te maak van hulle ondervinding met geldige gevalle van bedrog en die koers waarteen
vals alarms gegenereer word. Die doel van hierdie tesis is om ’n konteks te bepaal vir
en die werksverrigting te evalueer van bekende data ontginningstegnieke wat in bedrog
opsporingstelsels gebruik kan word.
Eerstens word ’n teoretiese agtergrond vir ’n aantal bekende data ontginningstegnieke
voorsien en ’n aantal gedagteryke artikels wat oor bedrog opsporing handel en wat hierdie
tesis beïnvloed het, opgesom. Die sellulêre telekommunikasie industrie word bekend gestel,
insluitend ’n kort bespreking oor die tipes bedrog wat deur Suid-Afrikaanse sellulˆere
telekommunikasie netwerk operateurs ondervind word.
Tweedens word die data versamelingsproses en die eienskappe van die versamelde
data bespreek. Verskillende data ontginningstegnieke word vervolgens toegepas op die
versamelde data om te demonstreer hoe gedragsprofiele van gebruikers gebou kan word
en hoe bedrog voorspel kan word. Die werksverrigting en gepastheid van die verskillende
data ontginningstegnieke word bespreek in die konteks van die bedrog opsporingsproses.
Laastens word ’n aanduiding van verdere werk in die gevolgtrekking tot hierdie tesis
verskaf, en wel in die vorm van ’n aantal aanbevelings oor moontlike aanpassings en verbeterings
van die bedrog opsporingsmetodes wat beskou en toegepas is. ’n Omvattende
bedrog opsporingsmodel wat gebruik maak van ’n kombinasie van data ontginningstegnieke
word ook voorgestel.
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Blood, Alan Physics Faculty of Science UNSW. "Biological effects of GSM mobile phone microwave radiation: an investigation of gene expression." Awarded by:University of New South Wales. School of Physics, 2005. http://handle.unsw.edu.au/1959.4/22071.
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There is evidence that athermal radiofrequency radiation can alter Heat Shock Protein (HSP) expression or protein phosphorylation, or alter MAP kinase signalling. Effects of long-term exposure in brain tissue due to repeated HSP perturbation (eg an inhibition of apoptosis) have been hypothesised (French et al, 2001). This study aimed to investigate the RNA expression profile (12,000 genes) and HSP family protein expression levels after either acute 1-hour or chronic 4-day intermittent exposures to simulated GSM radiation in a human primary fibroblast model. The results found minimal or no effects of GSM. Flasks were exposed to 900 MHz (217 Hz modulation) at 0.18 W/kg SAR within a Transverse Electromagnetic Mode chamber (TEM cell). Cultures rested for 2 hours before exposures. Affymetrix U95A microarray analysis of a single pilot set of experiments showed that about 40 genes were reported as upregulated >=2.5 fold in each condition. There was no evidence of altered expression of any MAPK-associated genes. Target genes reported in both conditions (CBFA2T1, ZNF148, ITGA1), and genes altered in one condition (CCS, PLEC1, BIRC5), and marginally altered HSP72 were selected for PCR analysis. No other members of the HSP family were altered. In three replicate experiments assayed by real-time PCR, six genes were either unchanged or showed randomly variable expression. However HSP72 RNA showed possible consistent slight upregulation of 1.37 +/- 0.21 in the chronic condition. Western immunoblots of HSP-60, -70, -72 and -V90 proteins showed no significant changes 5 hours after exposure. In preliminary studies using a serum starvation protocol, ERK-1 phosphorylation was unaltered after 5 or 30 minutes GSM (single experiments). When flasks were transiently cooled, ERK-1 phosphorylation was increased 20 minutes later, indicating a source of artefact in some protocols. An inflammatory challenge experiment with a low-dose of the cytokine IL-1???? found that acute GSM exposure post-challenge inhibited NF????B-mediated GRO???? induction by 1.5 fold (2 experiments). Preconditioning with mild heat induces transient inhibition of both NF????B signalling and apoptosis. Other studies indicate that EMF exposures similarly evoke cytoprotection. It is suggested that GSM evoked cytoprotective signalling in this inflammatory model.
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Soroa-Koury, Sandra. "Consumers' responses to mobile advertising a normative social behavior perspective /." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
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Hancox, Graham. "Factors affecting drivers willingness to engage with a mobile phone while driving." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/14754.
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This thesis investigates drivers willingness to engage with a mobile phone while driving. Many studies have looked into the effects on driving performance that can result from phone usage, but few studies have directly considered what can encourage or inhibit phone engagement behaviours in the first place. An initial exploratory study (Study 1) was conducted, for which a photo elicitation interview (N=20) was designed and implemented. This aimed to find the extent to which factors influencing phone use transferred from out of the car to the driving environment. In particular, the study aimed to explore whether the driving environment could be considered unique. The results indicated that the high demands placed on the driver by the road environment clearly distinguished it from the other environments and the reported propensity to use a phone seemed to reflect this. Only factors which either changed the level of attention required by the task, such as a change in task demand as a result of changes in the traffic environment, had any substantial influence on willingness to engage. Driving may not be unique in terms of the overall factors influencing phone use but it is unique in the extent to which this particular factor seems to have such a strong bearing on interaction. Building on findings from Study 1, that the demand and attention required seemed to influence willingness to engage, it was noted that Fuller s (2005) Task Capability Interface model would serve as a useful framework for the remainder of the thesis. This model suggests that driver behaviour is dictated by the level of task difficulty perceived; an interaction between task demand and capability. Therefore, the effects these two elements might have on willingness to engage with mobile phones while driving were tested separately in the two remaining studies. Previous research suggested that task demand should comprise a combination of roadway demand and the intended phoning task. Study 2, therefore, experimentally tested the extent to which road demand and phone function intended to be used influenced drivers decisions to engage with their phone. Participants (N=20) viewed video clips of real road environments of varying demand. Rating scales were used by participants to rate their willingness to engage with various phone functions according to the scenario they had just viewed. It was found both roadway demand and phone functionality affected willingness to engage with a mobile phone whilst driving. There was a higher propensity to engage in phone use in road environments perceived to have a lower demand and lower propensity to engage in phone use in the highest demand scenarios. Answering a call was the most likely function to be engaged with by the participants and sending a text message was the least likely. The final study investigated how capability (comprising both phone and driving capability) influenced willingness to engage. Participants (N=40) were required to drive in a simulator under two conditions, simulated low and high road demand. Their willingness to interact with their phones, when faced with a number of phone tasks, was then observed. It was found that driving capability had an effect on willingness to engage in high demand scenarios with the less capable, novice, drivers having a higher propensity to engage with placing a call, sending a text message and reading a text message than the more experienced drivers. Novice drivers were willing to engage with some functions on their phone at possibly inappropriate times. It was further found that, in the simulated low demand road environment, phone capability influenced willingness to engage, with those who were more capable at placing a call and sending a text message found to be more willing to engage with these functions. The research reported in this thesis represents the first attempt in the literature to study, in depth, the factors which can influence phone engagement behaviour while driving. Novel contributions include investigating if factors influencing phone use transferred from out of the car to the driving environment. Further novel contributions included whether the phone function and road demand interact to influence willingness to engage and whether capability can affect phone engagement behaviour while driving. Extending the model developed by Fuller, the thesis offers an original model that describes the factors affecting phone engagement behaviour while driving. Suggestions are proposed for how the findings presented in this thesis can effectively be used and how future work should build on these initial foundations.
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Passetti, Renata Regina 1981. "O efeito do telefone celular no sinal da fala : uma análise fonético-acústica com implicações para a verificação de locutor em português brasileiro." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/271133.
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Orientador: Plínio Almeida Barbosa<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Estudos da Linguagem<br>Made available in DSpace on 2018-08-27T03:40:06Z (GMT). No. of bitstreams: 1
Passetti_RenataRegina_M.pdf: 2198292 bytes, checksum: 75f3471d8eeffbfb0346d7705e4ea136 (MD5)
Previous issue date: 2015<br>Resumo: Esta dissertação avalia os efeitos causados ao sinal da fala pela transmissão telefônica de linhas móveis e, com isso, busca determinar o grau de modificação fonético-acústica intralocutor causado pelo filtro de banda do canal telefônico à voz habitual e os efeitos que a transmissão telefônica exerce sobre as vogais orais do português brasileiro, pelo estudo de parâmetros acústicos que são afetados por esse tipo de transmissão. As análises investigaram quais características acústicas eram modificadas e quais permaneciam inalteradas na fala de indivíduos diante da utilização de telefones celulares quando comparadas a gravações diretas. O corpus constitui-se de gravações de 10 locutores do sexo masculino, realizadas de forma simultânea nas condições via celular e direta, pelo posicionamento de um microfone em frente aos sujeitos enquanto falavam ao celular. As vogais orais do português brasileiro foram transcritas e segmentadas e, posteriormente, foi utilizado o script ForensicDataTrecking para extração automática das seguintes classes de parâmetros: frequência dos três primeiros formantes (F1, F2 e F3), frequência fundamental (F0), ênfase espectral, frequência de base da fundamental (baseline) e duração interpicos de F0 presentes no discurso. Foram conduzidas análises acústicas com o objetivo investigar os efeitos da transmissão telefônica sobre as vogais orais do português brasileiro, sobre os locutores e no espaço vocálico dos locutores. As análises foram validadas estatisticamente. Para a análise do efeito da transmissão telefônica sobre as vogais orais do português brasileiro, os resultados revelam alterações nas frequências do primeiro e o terceiro formante de, aproximadamente, 14%, na condição telefônica. Em relação às frequências do segundo formante, os resultados da análise de dispersão mostraram que a transmissão telefônica agiu de forma a aumentar artificialmente as frequências de vogais com baixos valores de F2 e a diminuir as frequências de vogais com altos valores de F2. Dos parâmetros acústicos investigados na análise dos efeitos da transmissão telefônica sobre os locutores, apenas a baseline e a duração interpicos de F0 não apresentaram diferenças estatisticamente significativas entre as duas condições de gravação, indicando robustez aos efeitos da transmissão telefônica e podendo ser considerados como parâmetros eficazes na análise forense. Esta análise revelou, também, que a transmissão telefônica agia de maneira distinta nos sujeitos, o que permitiu que fossem agrupados a depender do parâmetro investigado. A análise do efeito telefônico no espaço vocálico dos sujeitos complementou os resultados das análises anteriores. De modo geral, observou-se um abaixamento global do espaço vocálico na gravação telefônica, influenciado pelo aumento nas frequências de F1. A diminuição dos valores de F2 para as vogais anteriores e o aumento nos valores deste formante para vogais posteriores comprimiu o espaço vocálico da maioria dos sujeitos. As modificações nas disposições das vogais têm implicações perceptuais, uma vez que o abaixamento e redução do espaço vocálico fizeram com que as vogais se situassem proximamente a regiões centrais, podendo soar como mais abertas no telefone celular<br>Abstract: This dissertation evaluates the effects to speech signal due to telephone transmission of mobile phones and seeks to determine the degree of intra-speaker acoustic-phonetic modification caused by the mobile phone band-pass filter to the speech signal and the telephone transmission effects over the Brazilian Portuguese oral vowels by the study of the acoustic parameters affected by this kind of transmission. The analysis investigated which are the acoustic cues which are modified and which cues remain undifferentiated in the speaker's speech by the use of a mobile phone in comparison to direct recordings. The corpus used consists of simultaneous recordings of 10 male speakers in two conditions: via mobile phone and face-to-face, by placing a microphone directly in front of the subjects. The Brazilian Portuguese oral vowels were segmented and transcribed and the ForensicDataEvaluator script was used to automatically extract the following acoustic parameters: three first formants frequencies (F1, F2 and F3), median of fundamental frequency (F0), spectral emphasis, fundamental frequency baseline and F0 inter-peaks duration. The acoustic analyses aimed at investigating the telephone transmission effects over the Brazilian Portuguese oral vowels, over the speakers and at the speakers¿ vowel space. The analyses were supported statistically. The analysis of the telephone transmission effect over the Brazilian Portuguese oral vowels showed variations of 14% in the frequencies of the first and the third formants. The analysis of the scatter plot of F2 values showed that the mobile phone band-pass filtering has an effect of shifting upwards vowels with low values of F2 and shifting downwards vowels with high values of F2. For the analysis of the telephone transmission effects over the speaker only the acoustic parameters "fundamental frequency baseline" and "F0 inter-peaks duration" did not show any difference statistically significant between the two recording conditions, demonstrating robustness to the telephone transmission effects, which make them able to be considered as powerful parameters for forensic analysis. This analysis also revealed that the telephone transmission affects the speakers in different ways, which set them into different groups of speakers depending on the parameter analyzed. The analysis of the telephone effect in the speakers¿ vowel space shed some light on the previous analyses. In general, the increase of the F1 values in the mobile phone situation caused a global downward displacement of the vowel space. The decrease of the F2 values for the front vowels and the increase of the values of this formant for back vowels reduced the area of the vowel space for the most of the subjects. The vowels rearrangement at the vowel space in the telephone situation has some perceptual implications, since the lowering and reduction of the vowel space made the vowels be placed at its center, which could result in hearing these vowels as more open over the mobile phone<br>Mestrado<br>Linguistica<br>Mestra em Linguística
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Geary, Wendy. ""No matter where you go, there you are" but how do we find you? location determination technologies for cellular enhanced 9-1-1 service /." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=982.
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Thesis (M.A.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains vii, 85 p. : ill. (some col.) Vita. Includes abstract. Includes bibliographical references (p. 74-81).
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Lin, Hai Yun. "The magic wand : mobile phone use and Fujian entrepreneurs in China." Thesis, University of Macau, 2008. http://umaclib3.umac.mo/record=b1874128.
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Chio, Nga I. "The uses and perceptions of mobile phone in Macau." Thesis, University of Macau, 2009. http://umaclib3.umac.mo/record=b2162007.
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Li, Hong Ye. "Challenging the mainstream : youth identity and the popularity of Shanzhai mobile phones in China." Thesis, University of Macau, 2009. http://umaclib3.umac.mo/record=b2120009.
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Ouersoontornwatana, Ajana. "Nokia's marketing stategies of mobile phones in Thailand and Hong Kong." CSUSB ScholarWorks, 2002. https://scholarworks.lib.csusb.edu/etd-project/2208.
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In recent years, the mobile phone has been used as a tool to conduct business in many areas. The insufficient number of fixed wireless services has created an opportunity for the entry of mobile phone systems into the market to provide telecommunication sevice in Thailand and Hong Kong. Mobile phone use has been growing dramatically during the past ten years as a result of the high rate of economic growth.