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Scruggs, Janet E. Yee Michael. "Migration from netware to windows NT network operating system /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA368151.
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Thesis (M.S. in Information Technology Management, M.S. in Information Systems) Naval Postgraduate School, June 1999."June 1999". Thesis advisors(s): Douglas E. Brinkley, Erik Jansen, Mark Nissen. Includes bibliographical references (p. 123-125). Also available online.
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Scruggs, Janet E., and Michael Yee. "Migration from netware to windows NT network operating system." Thesis, Monterey, California. Naval Postgraduate School, 1999. http://hdl.handle.net/10945/13557.
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Migration from an existing information technology system to a new system presents many managerial challenges. There are technological challenges associated with running the old system, maintaining data integrity and bringing the new system online all without seriously impacting daily operations. There are human factors to consider like resistance to change and conflict management. In addition, organizational issues like management support and cross functional communication channels need to he addressed. This thesis reviews the technical migration from an operational NetWare network to Windows NT completed at the Defense Manpower Data Center (DMDC) in Monterey, CA. The DMDC case presents a typical set of issues that an IT manager is likely to face when implementing technology driven change. Technical, human and organizational factors of technical change are discussed. A list of lessons learned and a set of technical management guidelines are derived from analysis of the DMDC case. Details of Windows NT 4.0 and 5.0 features are included.
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Nowotny, Klaus, and Dieter Pennerstorfer. "Network migration: do neighbouring regions matter?" Routledge by Taylor & Francis Group, 2019. http://dx.doi.org/10.1080/00343404.2017.1380305.
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This paper analyses the role of the spatial structure of migrant networks in the location decision of migrants to the European Union at the regional level. Using a random parameters logit specification, a significant positive effect of migrant networks in neighbouring regions on migrants' location decisions is found. Although this spatial spillover effect is smaller than the effect of networks in the host regions, omitting to control for this spatial dependence results in a 40% overestimation of the effect of regional migrant networks on the location decision of newly arriving migrants.
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Andersson, Lisa. "Labour Migration and Network Effects in Moldova." Thesis, Uppsala University, Department of Economics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9215.
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This study investigates the impact of migration networks on the decision to migrate in Moldova. Using a recent cross-sectional household survey with extensive migration information I am able to disaggregate the migration networks according to kinship and further investigate the impact of different kinds of networks. The results show that migration networks have a significant positive impact on the decision to migrate, whereas the results do not reveal any conclusive evidence that certain kinships have stronger or different influence on the decision to migrate than others. The most influential determinants of migration when it comes to networks are ex-household members who migrated abroad and no longer make part of the household, and other individuals outside the household (i.e. friends, neighbours etc.) who migrated.
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Jin, Shan. "Labor Migration in China." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103634.
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With the transition of the economy in China, migrants start holding a more and more important position in the labor market. Therefore, from this dissertation, we try to explore different topics related to the migrants in China. This dissertation consists of three essays on who chooses to migrate, how networks affect migrants' outcomes, and what is the intergenerational impact of parental migration on children's risk preferences. In the first chapter, we briefly introduce the motivation and contribution, and then we provide the methods and detailed findings in the following chapters.
Chapter 2 examines the impact of the endogeneity of the decision to migrate on the wage differentials between migrants and non-migrants in China. We find that migrants are self-selected from the upper tail of the income distribution in their home location. Consistent with a theoretical model of migration choice, we show that the size of the selection effect on wage depends on the wage differences between the prefectures of origin and destination as well as migration cost. The selection effect also differs among workers with different education and in different cities.
Chapter 3 studies how networks affect migrants' migration decisions, employment, and wage levels by using 2005 China's mini-census. Different from existing studies, this paper takes into account the existence of self-selection in the labor market. With the help of a theoretical model, we have a better understanding of the mechanism of networks as well as the different network effects on rural and urban migrants. We find out that networks affect both rural and urban migrants' migration decisions positively. In terms of employment, networks exert positive impacts on rural migrants but not on urban ones, which is due to the different quality drops between rural and urban migrants when the networks increase. Such employment effects also lead rural migrants to face a more severe negative wage impact than urban migrants.
Chapter 4 investigates how parental migration affects left-behind underage children's risk preferences. By focusing on migrant parent groups, we are able to estimate whether the influence of nurture could also affect children's risk preference levels or not. The findings suggest that besides the intergenerational transmission of risk preferences between parents and children, parental migrations do have an influence on girls' risk preference levels. In addition, in terms of adult children's risk-related outcomes, we are able to find a positive parental migration impact on daughters' self-employment decisions. Findings help us have a better understanding of the relevant factors of risk preferences, and also confront the impact of the separation of parents and children.Doctor of Philosophy
Nowadays, migration becomes increasingly common and migrants take a large proportion of the labor market. With the economic development and the closer connections among regions, people are more likely to study or work outside their home locations than before. Even though there is still a strict household registration system in China, we can find the migration supporting systems are becoming established, and facilitate easier migration for more and more people. Having a better understanding of migrants helps us make better policies as well as have the labor market and society develop better. This dissertation explores who choose to migrate (Chapter 2), how the social connections or networks affect migrants' employment and wages (Chapter 3), and whether there is any intergenerational impact on migrants' children in terms of risk preferences (Chapter 4) using methods from labor economics and economic theory. We conclude that the best works tend to migrate first in the labor market, and social connections have different impacts on rural and urban migrants in terms of employment and wages. Moreover, we notice that migrant parents affect the left-behind children's risk preferences by both influences of nature and nurture. In sum, we study different topics on migrants and have a deeper understanding of how migrants are affected in the labor market as well as how migrants affect their next generations.
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Lo, Sau Man. "Design and evaluation of virtual network migration mechanisms on shared substrate." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54379.
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The Internet faces well-known challenges in realizing modifications to the core architecture. To help overcome these limitations, the use of network virtualization has been proposed. Network virtualization enables the deployment of novel network architectures and services on existing Internet infrastructure. Virtual networks run over physical networks and use Internet paths and protocols as essentially a link layer in the virtual network. Virtual networks can also share the resources in the physical substrate. Effective use of the underlying substrate network requires intelligent placement of virtual networks so that underlying resources do not incur over-subscription. Because virtual networks can come and go over time, and underlying networks can experience their own dynamic changes, virtual networks need to be migrated---re-mapped to the physical network during active operation---to maintain good performance. While virtual network placement, and to a lesser extent migration, has been studied in the past, little attention has been devoted to designing, deploying, and evaluating migration mechanisms for virtual networks. In this dissertation, we design virtual network migration mechanisms for different substrate platforms and further design a system to mitigate the effects of virtual network migration. In particular this dissertation makes the following contributions:
1. With the goal of minimizing the disruption during a virtual network migration, we design three algorithms for scheduling the sequence of virtual router moves that takes a virtual network from its original placement to its new placement.
2. We design and implement a controller-based architecture for virtual network migration on PlanetLab. This work explores the challenges in implementing virtual network migration on real infrastructure. Recommendations are given for infrastructure that support virtual network migration.
3. We propose and implement a mechanism to mitigate the performance degradation resulting from virtual network migration through transport and application layer collaboration. We utilize a centralized controller to notify the end-systems or the gateways about the time of the virtual network migration such that we prevent packet loss to the application traffic of the end-systems.
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Maier, Gunther, and Michael Vyborny. "Internal migration between US-states. A social network analysis." Institut für Regional- und Umweltwirtschaft, WU Vienna University of Economics and Business, 2005. http://epub.wu.ac.at/1084/1/document.pdf.
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In this paper we use the novel (at least in regional science) technique of social network analysis and apply it to one of the most analyzed topics in the discipline, US internal migration. We want to see whether social network analysis can yield any new insights into this well known process. We want to compare the technique to more conventional methods of analysis in migration. The paper presents an overview of social network analysis, defines key concepts and describes the main components of the technique. This discussion will also involve a discussion of currently available software for social network analysis. Then, we will apply the technique to the official data about internal migration between US states as published by the US bureau of the census, to see whether the technique can reproduce the main results of the traditional techniques and whether it can yield any new insights.Series: SRE - Discussion Papers
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Albarrán, Munoz Isaac, and Ruiz De Azúa Manuel Parras. "Telecommunication Services’ Migration to the Cloud : Network Performance analysis." Thesis, KTH, Kommunikationssystem, CoS, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93841.
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Nowadays, telecommunication services are commonly deployed in private networks, which are controlled and maintained by the telecommunication operators themselves, by co-location services providers, or, to some extent, by their hardware and software providers. However, with the present development of cloud computing resources, one might consider if these services could and should be implemented in the Cloud, thus taking advantage of cloud computing’s high availability, geographic distribution, and ease of usage. Additionally, this migration could reduce the telecommunication operators’ concerns in terms of hardware and network maintenance, leaving those to the Cloud computing providers who will need to supply a highly available and consistent service, to fulfill the telecommunication services’ requirements. Furthermore, virtualization provides the possibility of easily and rapidly changing the Cloud network topology facilitating the addition and removal of machines and services, allowing telecommunication services providers to adapt to their demands on the fly. The aim of this thesis project is to analyze and evaluate the level of performance, from the network point of view, that can be achieved when using Cloud computing resources to implement a telecommunication service, carrying out practical experiments both in laboratory and real environments. These measurements and analyses were conducted using an Ericsson prototype mobile switching center server (MSC-S) application, although the results obtained could be adapted to other applications with similar requirements. In order to potentially test this approach in a real environment, a prior providers’ survey was utilized to evaluate their services based on our requirements in terms of hardware and network characteristics, and thus select a suitable candidate environment for our purposes. One cloud provider was selected and its service was further evaluated based on the MSC-S application requirements. We report the results of our bench-marking process in this environment and compare them to the results of testing in a laboratory environment. The results of both sets of testing were well correlated and indicate potential for hosting telecommunication services in a Cloud environment, providing the Cloud meets the requirements imposed by the telecom services.Actualmente, los servicios de telecomunicaciones se implementan comúnmente en redes privadas, controladas y mantenidas por los operadores de telecomunicaciones, por proveedores de servicios de colocación o, hasta cierto punto, por proveedores de hardware y software. Sin embargo, con el presente desarrollo de la tecnología de ’Cloud computing’, se puede considerar la posibilidad de implementar servicios de telecomunicaciones en la nube, aprovechando su alta disponibilidad, distribución geográfica y facilidad de uso. Además, este cambio puede reducir las preocupaciones de los operadores en relación al mantenimiento del hardware y de la red, delegando en los proveedores del servicio de ’Cloud computing’, los cuáles deberán proporcionar un servicio consistente, cumpliendo así con los requisitos de los servicios de telecomunicaciones. Por otra parte, la virtualización propociona la posibilidad de cambiar rápida y fácilmente la topología de la red, facilitando la adición y supresión de maquinas y servicios, y, por tanto, permitiendo a los operadores adaptarse a sus necesidades sobre la marcha. El objetivo de esta tésis es analizar y evaluar en nivel de rendimiento, desde el punto de vista de la red, que se puede conseguir usando recursos de ’Cloud computing’ para implementar un servicio de telecomunicaciones, llevando a cabo experimentos tanto en el laboratorio como en un entorno real. Estos análisis fueron realizados utilizando un prototipo de un servidor de conmutación móvil (MSC-S) de Ericsson, aunque los resultados pueden adaptarse a otras aplicaciones con unos requisitos similares. Para probar esta propuesta en un entorno real, se realizó una encuesta de proveedores de servicios de ’Cloud computing’, con el objetivo de evaluar sus servicios teniendo en cuenta nuestros requisitos de hardware y red. Finalmente, un proveedor fue escogido y su servicio evaluado basándonos en los requisitos de la aplicación MSC-S. En este documento proporcionamos los resultados de esa evaluación y los comparamos con los obtenidos en el laboratorio. Los resultados de ambas evaluaciones fueron satisfactorios e indican la posibilidad de implementar servicios de telecomunicaciones en la nube, siempre que la nube cumpla los requisitos impuestos por dichos servicios de telecomunicaciones.
Nuförtiden är telekommunikationstjänster ofta uppsatta i privata nätverk, som kontrolleras och underhålls av teleoperatörerna själva, av samlokaliserande tjänsteleverantörer eller i viss utsträckning av deras hårdvaruoch programvaru-leverantörer. Med den nuvarande utvecklingen av Cloud Computing-resurser kan man dock överväga om dessa tjänster kan och bör genomföras i ett Cloud, vilket drar fördel av Cloud Computings höga tillgänglighet, geografiska spridning, och enkla användning. Denna migration minskar även teleoperatörernas oro angående hårdvaru- och nätverks-underhåll genom att överlåta detta till Cloud Computing-leverantörerna, som kommer att behöva leverera en hög tillgänglighet och konsekvent service för att uppfylla telekommunikationstjänsternas krav. Dessutom ger virtualisering möjlighet att enkelt och snabbt ändra ett Clouds nätverkstopologi, vilket underlättar tillägg och borttagning av maskiner och tjänster, vilket hjälper teleoperatörer att snabbt anpassa sig till deras krav. Målet med examensarbetet är att analysera och uppskatta prestandan, från nätets perspektiv, som kan uppnås vid användning av Cloud Computingresurser för att genomföra en teletjänst, genom praktiska experiment både i laboratorium och i verkligheten. Dessa mätningar och analyser utfördes med en prototyp av en Ericsson mobilomkopplingscentralserverapplikation (MSCS), även om de erhållna resultaten skulle kunna anpassas till andra program med liknande krav. För att potentiellt kunna testa denna metod i en verklig miljö användes en tidigare leverantörs undersökning för att utvärdera deras tjänster baserat på våra krav på hårdvara och nätverksegenskaper, och genom detta välja en lämplig kandidatmiljö för våra syften. En Cloud-leverantör valdes och dess tjänster utvärderades vidare baserat på MSC-Ss applikationskrav. Vi redovisar resultatet av vår testprocess i den här miljön och jämför det med resultaten av tester i laboratoriemiljö. Resultaten från båda uppsättningarna av tester var väl korrelerade och visar på potentialen av att implementera telekommunikationstjänster i en Cloud-miljö, om detta Cloud uppfyller de kraven som ställs av telekommunikationtjänsterna.
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Tsuboya, Hisakazu 1967. "Migration strategies for competitive advantage of mobile network operators." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/16991.
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Thesis (S.M.M.O.T.)--Massachusetts Institute of Technology, Sloan School of Management, Management of Technology Program, 2003.Includes bibliographical references (leaves 145-149).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Innovation in platform industries, including mobile telecommunications, has a great impact on societies and economies; hence a migration from an existing platform to the subsequent one should be progressed under careful forecasting, weighed scenarios and strategies that encompass a broad view. This thesis analyzes why mobile network operators are struggling to move from the second generation (2G) and its derivatives to the third generation (3G) technologies and proposes migration strategies, which allow them to sustain their competitive advantage. First, a migration model is proposed as a reinforcing loop model composed of two dynamics, "Platform Migration" caused by a shortage of network capacity, and "Service Innovation" triggered by a decline in ARPU (Average Revenue Per User). Platform migration is an implementation process for new platform technologies and can be categorized into Revolution-type and Evolution-type. After these two schemes have been evaluated through case studies, Collaboration-type migration, an enhanced Evolution-type, is proposed for future, technically diversified situations. Service Innovation is a process for creating new profitable services to give further revenue growth. Empirical analysis clarifies that mental breakthrough management is a common approach in the mobile industry and proposes that a mixture of corporate, partner and market initiatives be adopted for diversified customer preference. This thesis then proposes the following strategies for future successful migration: first, mobile network operators should drive the migration cycle powerfully, concentrating on successive service innovation dynamics for their revenue growth and the next platform migration. Second, they should choose migration schemes carefully according to their level of technology leadership, value chain leadership and investment capability. Finally, service platform should be considered for realization of innovative services with Partnership Dynamics.
by Hisakazu Tsuboya.
S.M.M.O.T.
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Ericsson, Joakim. "Object Migration in a Distributed, Heterogeneous SQL Database Network." Thesis, Linköpings universitet, Databas och informationsteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148181.
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There are many different database management systems (DBMSs) on the market today. They all have different strengths and weaknesses. What if all of these different DBMSs could be used together in a heterogeneous network? The purpose of this thesis is to explore ways of connecting the many different DBMSs together. This thesis will explore suitable architectures, features, and performance of such a network. This is all done in the context of Ericsson’s wireless communication network. This has not been done in this context before, and a big part of the thesis is exploring if it is even possible. The result of this thesis shows that it is not possible to find a solution that can fulfill the requirements of such a network in this context
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Chun, Yongwan. "Behavioral specifications of network autocorrelation in migration modeling an analysis of migration flows by spatial filtering /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1187188476.
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Nafziger, Jonathan W. "A Novel Cache Migration Scheme in Network-on-Chip Devices." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282327354.
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Liver, Toma, and Mohammed Darian. "Soft Migration from Traditional to Software Defined Networks." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44265.
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The concept of Software Defined Networking (SDN) may be a way to face the fast growing computer network infrastructure with its demands and requirements. The concept is attracting the interest of enterprises to expand their respective network infrastructures, but one has to consider the impacts of migrating from an existing network infrastructure to an SDN network. One way that could minimize the impacts is to proceed a soft migration from a traditional IP network to SDN, creating what is so called a heterogeneous network. Instead of fully replacing the network infrastructure and face the impacts of it, the idea of the soft migration is to replace a part of it with an environment of SDN and examine the performance of it. This thesis work will analyze the performance of a network consisting of a traditional IP network combined with SDN. It is essential during this work to identify the differences in performance when having a heterogeneous network in comparison with having a dedicated traditional IP network. Therefore, the questions that will be addressed during this thesis work is to examine how such a heterogeneous network can be designed and measure the performance of it in terms of throughput, jitter and packet losses. By the method of experimentation and the studying of related works of the SDN fundamentals, we hope to achieve our goals with this thesis work, to give us and the reader a clearer insight.
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Danchev, Valentin. "Spatial network structures of world migration : heterogeneity of global and local connectivity." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:81704dfc-4221-4ef4-81cf-35d89dfc364a.
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The landscape of world migration involves multiple interacting movements of people at various geographic scales, posing significant challenges to the dyadic-independence assumption underlying standard migration models. To account for emerging patterns of multilateral migration relationships, we represent world migration as a time-evolving, spatial network. The nodes in the World Migration Network (WMN) are countries located in geographic space, and the edges represent migratory movements for each decade from 1960-2000. In the first part of the thesis, we characterise the spatial network structure of the WMN, with a particular focus on detecting and mapping mesoscopic structures called 'communities' (i.e., sets of countries with denser migration connections internally than to the rest of the WMN). We employ a method for community detection that simultaneously accounts for multilateral migration, spatial constraints, time-dependence, and directionality in the WMN. We then introduce an approach for characterising local (intracommunity) and global (intercommunity) connectivity in the WMN. On this basis, we define a threefold typology that distinguishes 'cave', 'bi-regional', and 'bridging' communities. These are characterised with distinct migration patterns, spatial network structures, and temporal dynamics: cave communities are tightly-knit enduring structures that channel local migration between contiguous countries; bi-regional communities merge migration between two distinct geographic regions; bridging communities have hub-and-spoke dynamic structures that emerge from globe-spanning movements. Our results suggest that the WMN is neither a globally interconnected network nor reproducing geographic boundaries but involves heterogeneous patterns of global and local ('glocal') migration connectivity. We examine a set of relational, homophily, and spatial mechanisms that could have possibly generated the 'glocal' structure we observe. We found that communities of different types arise from significantly different mechanisms. Our results suggest that migration communities can have important implications for world migration, as different types of community structure provide distinct opportunities and constraints, thereby distinctively shaping future migration patterns.
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Charmet, Fabien. "Security characterization of SDN virtual network migration : formal approach and resource optimization." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAS008.
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Cette thèse explore la sécurité de la migration de réseaux virtuels. Au cours des années, la virtualisation a été utilisée pour optimiser l'usage des ressources informatiques et pour supporter les infrastructures des entreprises. La virtualisation consiste à allouer une partie des ressources d'une machine physique à un utilisateur (sous la forme d'une machine virtuelle) pour qu'il puisse l'exploiter. Les machines virtuelles sont utilisées pour héberger des services opérationnels comme un serveur internet ou une base de données. La virtualisation des réseaux n'a pas profité du même intérêt de la part des chercheurs et des acteurs industriels. Le paradigme du Software Defined Networking a introduit de nouvelles possibilités pour implémenter la virtualisation réseau et fournir aux utilisateurs une solution flexible pour leurs besoins métiers. Les réseaux virtuels sont utilisés pour interconnecter des machines virtuelles, et ils peuvent être configurés avec des règles de routages ou des protocoles de sécurité spécifiques. Dans l'éventualité où un équipement réseau tomberait en panne ou sous le coup d'une attaque informatique, le système d'hypervision va migrer les ressources afin de préserver la disponibilité des services utilisateurs.La sécurité des machines virtuelles et de leur migration est un domaine de recherche qui a été grandement exploré par le passé, tandis que la virtualisation réseau et plus spécifiquement la migration de réseaux virtuels restent encore des domaines de recherche assez jeune et où beaucoup reste à faire. La surface d'attaque de la virtualisation réseau est similaire en nature à celle de la virtualisation traditionnelle, mais elle présente un aspect supplémentaire dû à l'usage du paradigme du Software Defined Networking. La motivation de notre travail est d'étudier la sécurité du processus de migration des réseaux virtuels, dans le contexte du Software Defined Networking. Nous proposons d'atteindre cet objectif en trois phases. Tout d'abord, nous définissons le périmètre de cette étude, et nous concentrons sur l'aspect réseau de la migration. Ensuite, nous décrivons le modèle d'attaquant afin de compromettre la migration des réseaux et nous concevons un mécanisme de détection contre les attaques envers l'infrastructure de virtualisation. Enfin, nous améliorons le mécanisme de défense en optimisant le déploiement des ressources de détection afin d'obtenir une couverture optimale de l'infrastructure.Dans la première partie de cette thèse, nous proposons une approche formelle pour décrire les différents composants de l'infrastructure de virtualisation.Nous utilisons un formalisme de logique du premier ordre pour décrire différentes propriétés de sécurité sous la forme de prédicats booléens.Cette modélisation inclut la représentation des données des utilisateurs finaux ainsi que l'infrastructure de virtualisation.Une trace d'exécution est générée pendant la migration d'un réseau virtuel, et est ensuite utilisée par un prouveur de théorème afin de vérifier formellement si la sécurité de la migration a été respectée. Le modèle formel est basé sur la supposition que la trace d'exécution est générée par un outil de supervision exempt de tout défaut. Ceci implique que la preuve formelle est complète. Nous levons cette hypothèse en modélisant un problème d'allocation de ressources afin de déterminer quels équipements réseau devraient être chargés de la détection d'attaques pour une couverture optimale. Nous résolvons ce problème en utilisant un processus de décision markovien. Nous concluons notre optimisation en proposant un déploiement statique des ressources, en amont de toute migrationThis thesis investigates the security of virtual network migration. Over the years, virtualization has been used to optimize physical resources and to support businesses’ infrastructure. Virtualization consists in exposing a fraction of a resource for a user to operate. Virtual Machines are used to host business services like web servers or a backup service. Network virtualization has not benefited from the same interest from researchers and the industry. The Software Defined Networking paradigm has introduced new possibilities to implement network virtualization and provide users with a flexible network, decoupled from the physical equipment. Virtual Networks are used to interconnect Virtual Machines and can be configured with specific routing policies or security protocols. In case of a failure of the resource, either accidental or intentional, the virtualization infrastructure will migrate the resource to maintain the service provided.The security of Virtual Machines and their migration is a well-researched topic that has been widely in the past, while the study of network virtualization and especially the migration process only are at an early stage. The attack surface of network virtualization is similar in nature to the virtualization of legacy resources, and presents an additional aspect because of the use of Software Defined Networking.The motivation of this research is to investigate the security of the virtual network migration process in the context of Software Defined Networking. In order to do so, we first define the scope of the study and focus on the networking aspect of the migration. Then, we outline the threat model of the migration process and devise a detection mechanism against attacks in the virtualization infrastructure. Finally, we optimize the previous mechanism by optimizing the deployment of network monitoring resources for an optimal coverage.In the first part of this thesis we propose a formal approach to describe the different aspects of the virtualization infrastructure. We use a first order formalism to model several security properties as a set of logical predicates. These predicates account for both physical and virtual elements of the virtualization infrastructure, and the data use by both end users and the infrastructure owner.An execution trace is generated during the migration of a virtual network, and will be used by a theorem prover to compute a formal proof to verify if a security violation occurred. The first order model is based on the assumption that the execution trace is generated using perfect monitoring. This implies that the proof is complete and that the networking monitoring is always done under optimal conditions.We alleviate this assumption by modeling a resource allocation problem to determine how the monitoring resources should be deployed and which network nodes provide the best coverage. We solve this problem using a Markov Decision Process, and determine a dynamic deployment of monitoring resources during the migration. We conclude our optimization with a proposition of a static deployment of the resources prior to the migration
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Stjernström, Olof. "Flytta nära, långt bort : de sociala nätverkens betydelse för val av bostadsort." Doctoral thesis, Umeå universitet, Kulturgeografiska institutionen, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-61927.
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This study deals with long distance migration together with the importance of social networks and geographical preferences for the choice of destination when moving. Thus, the main purpose of this study is to analyze and specify the importance of the mover's social contacts when choosing a new place-of residence. In this connection, the social contents of the destination are chiefly focused. It has also been of interest to estimate in what degree these social contents have influenced this choice of destination by the individual. The differences in quality, intensity, dispersion and direction of social contacts is essential for explaining destination decisions. The basic hypothesis claims that the existence of social networks influences the individual's inclination to move and the choice ofplace-of-residence. In this study, empirical material is used, and its base is 2500 "movers" and a group of "stayers" of equal size. Data from public registers as well as data from inquiries have been used as empirical material. Far away moving is defined as moving across the communal boundaries. The examination of the empirical facts provides input paramétrés for a model, where a number of factors might explain the destination. The model work is implemented in three stages. In the multiple regression model, the impact of a number of variables is estimated. In the logistical regression model the probability of moving into a 'network commune' is estimated, i.e., moving to a commune where there are social contacts. In a third stage, the same variables are tested in a multi-nominal model. Strictly empirically, this study reveals, that there is evidence that the social networks influence the choice of destination when moving. Equally important, perhaps is to find out how strong an impact these networks have. Moving to a geographically and socially recognizable place is possibly regarded as having a more positive impact than the structure of the labour market. It can be stated that, in spite of the widespread migration within post-war Sweden, most people maintain some sort of social and geographical relation to the place where they grew up. The increased mobility per se has also implied that the individual, spatial and social contacts have become more widely spread. The place where one grew up is central and could be said to represent the place where there are many social contacts and the place you always refer to. Social contacts connected to relatives constitute one of the most important single factors. Previous place-of-residence is undoubtedly the most important single factor. Migration to a place of previous residence also implies that there already exists a social network. The access to a holiday cottage and the location of this cottage proves to have a great impact on destination- decisions. Many people simply move to the commune, where they own, or have access to, a holiday cottage. Of several plausible explanations two seem to be relevant. One concerns moving into former cottages, for year round residence, the other implies that the cottage could be regarded as the tangible link to the former home area. If there is no possibility of staying on in one's home area, the cottage represents a link to the past.digitalisering@umu
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Mora-Canzani, Fernanda. "Citoyenneté diasporique : problématiques et horizons au prisme de l'expérience uruguayenne." Thesis, Paris 8, 2017. http://www.theses.fr/2017PA080060/document.
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Reposant sur l’expérience uruguayenne (1985/2015), prenant en compte un contexte de mondialisation, notre thèse vise à problématiser, au prisme d’une philosophie politique critique, une citoyenneté nommée diasporique, déployée aux interstices des États-nation, émergeant au travers de processus migratoires, de l’exil et de l’interconnexion de communautés diasporiques.Sous l’éclairage des philosophies de la citoyenneté nous cartographions cette singulière citoyenneté se déployant en scénarios transnationaux et processus interactifs, dans lesquels interviennent différentes catégories d’acteurs.Ainsi, chacun, individuellement ou au sein de groupes d’appartenance, devient citoyen par des actes, des discours, des représentations, dans l’aspiration de trouver une place à part entière au sein d’une communauté politique, sans en devenir prisonnier. Sans nous contenter d’examiner les situations de déterritorialisation évoquées - exil, migration, diaspora-, notre intention est plutôt d’interroger les conditions que s’y trouvent associées dans l’émergence et le déploiement d’une citoyenneté diasporique.Nous conceptualisons dès lors quatre conditions majeures : subjectivité sensorielle et émotionnelle enracinement rhizomique ; réseautique en constellations versatiles ; subjectivation politique mise à l’épreuve par une impossible émancipation. Les logiques auxquelles l’expérience citoyenne diasporique uruguayenne se rattache nous conduisent à poser enfin que la citoyenneté n’est pas prisonnière des institutions.Elle peut s’inventer au sein d’une communauté politique, qu’elle s’exprime en activisme citoyen ou en citoyenneté ordinaireBased on the Uruguayan diasporic experience (1985/2015), and taking into account the context of globalization, our thesis aims at problematizing, at the prism of a critical political philosophy, a citizenship called "diasporic", deployed at interstices of Nation-States, emerging through international migratory processes, political exile, and the interconnections of the diaspora communities. In the light of philosophies of citizenship, we map out a diasporic citizenry deployed in transnational situations and interactive processes, in which different categories of participants have a hand in intervening. Thus, each - individually or within the groups to which they belong - through acts, speeches and representations becomes Citizen; aspiring to find a complete place in a political community without becoming captive to it. Without being content to limit ourselves to examining the aforementioned situations of deterritorialization - exile, migration, diaspora - our intention is rather to identify the conditions associated with them in the emergence and deployment of diasporic citizenship. We conceptualize on these bases four major conditions, which we call: sensorial and emotional subjectivity; rhizomic integration; networking in versatile forms; political subjectivity put to the test by an "impossible" emancipation. The logical reasonings to which the experience of the Uruguayan diasporic citizen are connected to lead us finally to assume that citizenship is not beholden to institutions. It can invent itself within the bosom of a political community; express itself as citizen activism or ordinary citizenship
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Liu, Wei. "Tetraspanin KAI1/CD82 inhibits cell migration-related cellular events via reorganizing actin network." View the abstract Download the full-text PDF version, 2007. http://etd.utmem.edu/WORLD-ACCESS/Liu/2007-030-Liu.pdf.
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Thesis (M.S. )--University of Tennessee Health Science Center, 2007.Title from title page screen (viewed on July 17, 2008). Research advisor: Xin Zhang, Ph.D. Document formatted into pages (xv, 197 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 159-197).
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Symeri, Ali. "Application Server Mobility and 5G Core Network." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254658.
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With advancements in the mobile network architecture, from the Fourth Generation to the Fifth Generation, a vast number of new use cases becomes available. Many use cases require cloud-based services, where a service is deployed close to the user. For a user to communicate with a service, it connects to the mobile network base station, Fifth Generation Core network and then to the service. When the user changes physical location, the mobile network and the service must apply mobility techniques. This is to prevent tromboned traffic and provide low latency between user and service. When a handover occurs, so that a user’s attachment point to the mobile network is changed from the one base station to another and the User Plane Function changes, the cloud-based service may have to seamlessly move from one cloud to another as well. In this thesis, a Service mobility framework is proposed and implemented, which enables service live migration between edge clouds and it provides simple RESTful APIs. The evaluation of the framework shows that the proposed implementation adds low delays to the total migration time and the service downtime is also shown to be low in the case of video streaming with no service interruption.Med framsteg i det mobila nätverkets arkitektur, sett från den Fjärde Generationen till den Femte Generationen, så blir nya användningsområden tillgängliga. Bland de nya användningsområdena inkluderas molnbaserade tjänster, där tjänster är placerade nära användare, dessutom har vissa områden behov av dessa molnbaserade tjänster. För att en användare ska kunna kommunicera med en tjänst så måste den först ansluta till det mobila nätverkets basstationer och sedan till Femte Generationens kärnnätverk, för att sedan kunna kommunicera med tjänsten. När användaren förflyttar sig från en plats till en annan, så måste det mobila nätverket och tjänsten tillämpa rörlighetstekniker, som förflyttning av tjänsten. Förflyttningen är för att förhindra trombonerad trafik och att förse låg latens mellan användare och tjänst. När en överlämning sker, d.v.s att en användares kopplingspunkt till det mobila nätverket ändras, från en basstation till en annan, och att User Plane Function ändras, så kan även den molnbaserade tjänsten förflytta sig sömlöst från ett moln till ett annat. I denna avhandling presenteras ett tjänströrlighetsramverk som möjliggör tjänströrlighet mellan moln och erbjuder enkla RESTfulla API:er. Evaluering av ramverket visar att implementationen bidrar med låga fördröjningar till den totala migrations tiden samt att tjänster med videoströmming har lågt driftstopp utan tjänstavbrott.
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Muzzin, Joanne Jennifer. "Influence of upward water flow on downward DNAPL migration through a rock fracture network." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22367.pdf.
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Hussain, Turab S. M. "Policy analysis and network effects in an extended family model of rural-urban migration." Thesis, University of Essex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401082.
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Kassahun, Solomon, and Atinkut Demissie. "A PMIPv6 Approach to Maintain Network Connectivity during VM Live Migration over the Internet." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4814.
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Live migration is a mechanism that allows a VM to be moved from one host to another while the guest operating system is running. Current live migration implementations are able to maintain network connectivity in a LAN. However, the same techniques cannot be applied for live migration over the Internet. We present a solution based on PMIPv6, a light-weight mobility protocol standardized by IETF. PMIPv6 handles node mobility without requiring any support from the moving nodes. In addition, PMIPv6 works with IPv4, IPv6 and dual-stack nodes. We have setup a testbed to measure the performance of live migration in a PMIPv6 network. Our results show that network connectivity is successfully maintained with little signaling overhead and short VM downtime. As far as we know, this is the first time PMIPv6 is used to enable live migration beyond the scope of a LAN.
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Stapleton, Caroline. "The migrant network effect : an empirical analysis of rural-to-urban migration in South Africa." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/13747.
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Recent empirical migration literature in South Africa suggests that access to physical and human capital, in the way of finance and education respectively, are key factors in increasing one’s probability of migrating. This paper attempts to extend this literature by directly measuring the extent to which social capital, broadly defined as one’s access to a migrant network, affects the probability of rural-to-urban migration. Using the first nationally representative panel dataset in South Africa, the National Income Dynamics Study, and defining a rural-to-urban migrant as an individual who is observed moving from a rural area in the baseline wave (2008) to an urban area by Wave 3 (2012), I estimate a standard model of migration choice with the inclusion of one’s connection to a migrant network. This connection is measured by being part of a household in the baseline wave that contains somebody with current or recent experience as a labour migrant. In line with international migration literature, the empirical results suggest that access to a migrant network increases the likelihood of becoming a migrant (by between 2-3 percentage points). These findings are robust to the inclusion of the individual’s prior migration experience and employment status. Furthermore, an extension of the core analysis to assess the impact of genetic relatedness in conjunction with the migrant network effect suggests some evidence of a household bargaining process at play. The findings in this paper therefore suggest that social capital does indeed play a role along with physical and human capital in determining who migrates in South Africa.
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Östlund, Rosanna. "I had some problems back home with a big group of people and it was not safe for me there anymore so I had to run away : How LGBT asylum seekers move." Thesis, Stockholms universitet, Kulturgeografiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-131386.
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Due to the increased number of the amount of asylum-seekers that have migrated to Sweden lately, the topic has received increased attention. This has contributed to housing shortage and policy reforms for new migrants to arise in order to ensure that everybody gets housing. Asylum seekers often experience more difficult patterns to housing, and for LGBT asylum seekers especially since they are such a marginalised group in our society already. Housing is an important part in the initial settlement stage and good housing enables successful resettlement and that will help with the integration process. The aim of this thesis is to look at LGBT asylum seekers mobility and what constrains and opportunities they face in that process. To answer these questions qualitative method and semi-structured life story interviews have been performed with twelve LGBT asylum seekers. The result of these interviews has been presented around four different concepts that were factors contributing to their mobility. These four concepts that were found in the interviews was forced migration, homophobia, social network and freedom. These findings should be of interest for further studies in order for LGBT asylum seekers mobility patters to become more safe and secure.
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Sharma, Puja. "A Suspended Fiber Network Platform for the Investigation of Single and Collective Cell Behavior." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/82709.
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Cells interact with their immediate fibrous extracellular matrix (ECM); alignment of which has been shown influence metastasis. Specifically, intra-vital imaging studies on cell invasion from tumor-matrix interface and wounds along aligned fibers describe invasion to occur as singular leader (tip) cells, or as collective mass of a few chain or multiple tip cells. Recapitulation of these behaviors in vitro promises to provide new insights in how, when and where cells get the stimulus to break cell-cell junctions and ensue invasion by migrating along aligned tracks. Using Spinneret based Tunable Engineered Parameters (STEP) technique, we fabricated precise layout of suspended fibers of varying diameters (300, 500 and 1000 nm) mimicking ECM dimensions, which were interfaced with cell monolayers to study invasion. We demonstrated that nanofiber diameter and their spacing were key determinants in cells to invade either as singularly, chains of few cells or multiple-chains collectively. Through time-lapse microscopy, we reported that singular cells exhibited a peculiar invasive behavior of recoiling analogous to release of a stretched rubber band; detachment speed of which was influenced with fiber diameter (250, 425 and 400 µm/hr on small, medium and large diameter fibers respectively). We found that cells initiated invasion by putting protrusion on fibers; dynamics of which we captured using a contrasting network of mismatched diameters deposited orthogonally. We found that vimentin, a key intermediate filament upregulated in cancer invasion localized within a protrusion only when the protrusion had widened at the base, signifying maturation. To develop a comprehensive picture of invasion, we also developed strategies to quantify migratory speeds and the forces exerted by cells on fibers. Finally, we extended our findings of cell invasion to report a new wound healing assay to examine gap closure. We found that gaps spanned by crosshatch network of fibers closed faster than those on parallel fibers and importantly, we reported that gaps of 375 µm or larger did not close over a 45-day period. In summary, the methods and novel findings detailed from this study can be extended to ask multiple sophisticated hypotheses in physiologically relevant phenomenon like wound healing, morphogenesis, and cancer metastasis.Ph. D.
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Saint-Louis, Loretta J. "Migration evolves: the political economy of network process and form in Haiti, the U.S. and Canada." Thesis, Boston University, 1988. https://hdl.handle.net/2144/38095.
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Thesis (Ph.D.)--Boston UniversityPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
This study examines the evolution of the kin-based organization of Haitian migration to the U.S. and Canada during the Duvalier era. Using a model applicable to all migration, the study looks at two ways in which a hierarchy of interactive macrosystems shaped Haitian migration by generating constraints on choice. First, over a period of 290 years, the emerging world system, the European and U.S. empires, the Haitian national political-economy, and local political-economies have shaped Haiti's domestic systems. In doing this, they shaped the behavior patterns and ideology of kin units which make life decisions, thereby affecting migration choices. Second, at particular times, certain macrosystems, especially at the empire level, have strongly structured particular migration patterns, determining not only their direction but also, largely, their social organization. Structural conditions shaping migration to the U.S. and Canada between 1957 and 1986 encouraged kin-based organization. The specific Haitian forms of family and network processes, discovered through fifteen years of network observation and two years of intensive field work, stem from the traditions of the lakou, the extended family residential compound, which developed during the nineteenth century and disappeared during the mid-twentieth, due to land pressures from partible inheritance, ecological degradation, and U.S. penetration of the Haitian economy. Lakou traditions of joint action and solidarity among consanguineally-linked households inform current patterns of intense cooperation in migration among the nuclear family, the household, and a subset of the extended family, including adult siblings, their parents, and children. Migration structured through this form of social organization has numerous feedback effects on local and national political-economic and social systems in Haiti, the U.S., and Canada. The study concludes that migration evolves over time from the interaction of a hierarchy of political-economic macrosystems with domestic systems. The social and cultural processes as well as the political-economic processes generate and shape migration patterns. \
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Kouider, Mohamad. "Syrian Secondary Migration : A study on push and pull factors behind the irregular migration of Syrians from Turkey to Europe." Thesis, Malmö universitet, Malmö högskola, Institutionen för globala politiska studier (GPS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-40330.
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This research aims to gain a detailed understanding of the push and pull factors that lead many Syrians in Turkey to migrate to Europe. Syrians are pushed to migrate for various reasons, including socio-economic difficulties in Turkey. It explores the Syrians’ experiences in Turkey and the elements that have deterred them from gaining the fundamental rights of accommodation, access to the labor market, and refugee status. The pull factors refer to the gains that the Syrians might achieve when migrating to Europe. These gains are socio-economic gains that assure a better future for them in Europe in comparison to their presence in Turkey. In this case, this research also explores how the Syrians plan to migrate to Europe by employing the influence of their social networks to conduct their secondary migration. This qualitative study uses seven semi-structured interviews and analyzes the experiences of the interviewees in order to reach concrete conclusions. The results of this study, according to the interviewees’ experiences, show that restrictive Turkish policies and procedures have pushed many Syrians to migrate. At the same time, the Syrians are attracted to migrating to Europe for better protection for them and their children. The findings also demonstrate that social ties influenced Syrians in their decision to migrate to Europe and avoid being deported to Syria.
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Jacobs, Paul D. "The Role of Educational Attainment in Migration Probability and Destination Selection for the Metropolitan Rust Belt, 1980-2000." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1301.
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The U.S. has undergone macroeconomic changes over the latter course of the twentieth century. As a result, migration patterns have shifted toward the fast-growing southern and western portions of the nation. My research measures the impact of deindustrialization and educational selection on out-migration from the metropolitan Rust Belt for 1980, 1990, and 2000. Analysis on destination selection using multinomial regression analysis is then conducted to determine whether education trumps social capital for long-distance migration. Findings indicate that more severely deindustrializing metropolitan areas have greater out-migration in 1980 and 1990 but less so for 2000, with positive educational selection for each year. Multinomial results indicate that education does not attenuate social capital for interregional migration destination. The rise of the service economy may indicate the increasing importance of social capital for individuals leaving the Rust Belt for other regions.
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Liang, Meng. "Seasonal labour migration of Chinese agricultural workers to Kawata village : migrant realities, negotiations, and a collaborative power network." Thesis, University of Cambridge, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709010.
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Assasa, Hany. "Service Mobility in Mobile Networks." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166540.
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In the current mobile network architecture, network traffic between user equipment (UE) and services deployed on the public cloud is tromboned towards the anchor point which could lead to network congestion. Deploying services closer to the UE, for example near the eNodeB, is a potential solution. The services are deployed on small scale data centers connected to, or collocated with the eNodeB, called ’eNodeB-Cloud’ (eNBC). Mobility of UEs presents a challenge for deploying services in an eNBC. When the UE is handed over from one eNodeB to another, seamless migration of UE context between the service instances running in different eNBCs needs to be ensured. In this thesis, we propose a Platform as a Service framework to enable UE context migration between eNBCs. The architecture consists of handover signaling mechanism, network session migration technology, context transfer protocol and a set of APIs towards the service. The evaluation of the prototype implementation shows that virtualization causes some extra delays to the UE context migration time. Whereas when virtualization is omitted, the time taken to migrate a UE context between two eNBCs is in the order of 12 ms on average, which is within the limit of handover interruption time between two LTE-eNodeBs.
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Liu, Liping. "Chinese migrant workers and mental health: a systematic review and examination of the role of multimodal connectedness, mobile communication, and network ties." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/522.
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The first part of this dissertation systematically and comprehensively reviews the literature to understand what is and is not known about Chinese internal migration and mental health. By identifying the research gaps, the second part of this dissertation extends previous research by offering an integrative perspective that articulates how multimodal connectedness by diverse media forms influence one's personal networks, and thus their social capital, social support, and life satisfaction and positive mental health as two subjective well-being outcomes. The theory of media multiplexity (Haythornthwaite, 2005) was employed to explain the relations between Chinese internal migrant workers' diverse media use and their personal ties linked. Media multiplexity advocates that strong ties tend to use diverse media forms to sustain the deep levels of mutual dependency, while only one or two media were employed in the communication of weak ties. However, there is still a dearth of studies investigating Chinese migrant workers' diverse media use to establish and maintain their social ties. In this dissertation, the theory of media multiplexity was advanced with the consideration of the diverse media values in particular Chinese social context within the Chinese migrant worker population. The traditional perspective of media multiplexity theory emphasizes the positive relationship of the media use number and tie strength. In this dissertation I argue that both the number and value of different media forms should be considered to understand the nexus the migrant workers' multiplex media use to interact with different social ties. Moreover, this study also first time investigated the personal networks of Chinese migrant workers and how their personal networks function influences their mental health.
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Kryger, Anton, and Hampus Schönfeldt. "Should I Stay or Should I Go? : A cross-sectional study of refugee's internal migration pattern in Sweden." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Nationalekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-40204.
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Background: Sweden has in the past four years experienced a large influx of refugees. Some of these refugees were arranged housing upon arrival by the Swedish state. Approximately 30 percent of the refugees that were arranged housing have within five years relocated from the initial municipality of residence. Purpose: The purpose of this study is to analyze the influence refugee’s networks has on their internal migration in Sweden. Information regarding refugees residential preferences, and if location-specific social capital affect these preferences is important for policymakers to facilitate integration. Method: The initial and subsequent residential locations among refugees is studied to analyze how important other immigrants overall, and other immigrants from the individual’s country of birth in a municipality affect if a refugee stays in the initial municipality of residence or not. Conclusion: The results suggest that refugees stay in municipalities with high a representation of inhabitants from the individual’s birth country but move away from municipalities where there is a large share of immigrants overall.
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Kiso, Marina. "Long isoform of VEGF stimulates cell migration of breast cancer by filopodia formation via NRP1/ARHGAP17/Cdc42 regulatory network." Kyoto University, 2018. http://hdl.handle.net/2433/235980.
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Lang, Nadine [Verfasser], and Ben [Akademischer Betreuer] Fabry. "The Influence of Matrix Properties on Cell Migration in Disordered 3-dimensional Biopolymer Network / Nadine Lang. Gutachter: Ben Fabry." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2014. http://d-nb.info/1075478790/34.
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Huang, Wei. "High Performance Network I/O in Virtual Machines over Modern Interconnects." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1218602792.
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Di, Cicco Nicola. "Scalable Algorithms for Cloud Radio Access Network (C-RAN) Optimization." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23755/.
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In the evolving scenario of 5G networks, resource allocation algorithms for the Cloud Radio Access Network (C-RAN) model have proven to be the key for managing ever increasing Capital Expenditure (CAPEX) and Operating Expenditure (OPEX) for mobile networks while ensuring high Quality of Service (QoS).
In Chapter 1 a brief overview of the main elements of the C-RAN and of the methodologies that are employed in this work is provided.
In Chapter 2, an exact scalable methodology for a static traffic scenario, based on lexicographic optimization, is proposed for the solution of a multi-objective optimization problem to achieve, among other goals, the minimization of the number of active nodes in the C-RAN while supporting reliability and meeting latency constraints. The optimal solution of the most relevant objectives for networks of several tens of nodes is obtained in few tens of seconds of computational time in the worst case. For the least relevant objective a heuristic is developed, providing near optimal solutions in few seconds of computing time.
In Chapter 3, an optimization framework for dynamic C-RAN reconfiguration is developed. The objective is to maintain C-RAN cost optimization, while minimizing the cost of virtual network function migration. Significant savings in terms of migrations (above 82% for primary virtual BBU functions and above 75% for backup virtual BBU functions) can be obtained with respect to a static traffic scenario, with execution time of the optimization algorithm below 20 seconds in the worst cases, making its application feasible for dynamic scenarios.
In Chapter 4, an alternative Column Generation model formulation is developed, and the quality of the computed lower bounds is evaluated. Further extensions from this baseline (e.g. Column Generation based heuristics, exact Branch&Price algorithms) are left as future work.
In Chapter 5, the main results achieved in this work are summarized, and several possible extensions are proposed.
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Melo, Márcio Daniel Tavares de. "Network virtualisation from an operator perspective." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/12876.
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Doutoramento em Engenharia EletrotécnicaNetwork virtualisation is seen as a promising approach to overcome the so-called “Internet impasse” and bring innovation back into the Internet, by allowing easier migration towards novel networking approaches as well as the coexistence of complementary network architectures on a shared infrastructure in a commercial context. Recently, the interest from the operators and mainstream industry in network virtualisation has grown quite significantly, as the potential benefits of virtualisation became clearer, both from an economical and an operational point of view. In the beginning, the concept has been mainly a research topic and has been materialized in small-scale testbeds and research network environments. This PhD Thesis aims to provide the network operator with a set of mechanisms and algorithms capable of managing and controlling virtual networks. To this end, we propose a framework that aims to allocate, monitor and control virtual resources in a centralized and efficient manner. In order to analyse the performance of the framework, we performed the implementation and evaluation on a small-scale testbed. To enable the operator to make an efficient allocation, in real-time, and on-demand, of virtual networks onto the substrate network, it is proposed a heuristic algorithm to perform the virtual network mapping. For the network operator to obtain the highest profit of the physical network, it is also proposed a mathematical formulation that aims to maximize the number of allocated virtual networks onto the physical network. Since the power consumption of the physical network is very significant in the operating costs, it is important to make the allocation of virtual networks in fewer physical resources and onto physical resources already active. To address this challenge, we propose a mathematical formulation that aims to minimize the energy consumption of the physical network without affecting the efficiency of the allocation of virtual networks. To minimize fragmentation of the physical network while increasing the revenue of the operator, it is extended the initial formulation to contemplate the re-optimization of previously mapped virtual networks, so that the operator has a better use of its physical infrastructure. It is also necessary to address the migration of virtual networks, either for reasons of load balancing or for reasons of imminent failure of physical resources, without affecting the proper functioning of the virtual network. To this end, we propose a method based on cloning techniques to perform the migration of virtual networks across the physical infrastructure, transparently, and without affecting the virtual network. In order to assess the resilience of virtual networks to physical network failures, while obtaining the optimal solution for the migration of virtual networks in case of imminent failure of physical resources, the mathematical formulation is extended to minimize the number of nodes migrated and the relocation of virtual links. In comparison with our optimization proposals, we found out that existing heuristics for mapping virtual networks have a poor performance. We also found that it is possible to minimize the energy consumption without penalizing the efficient allocation. By applying the re-optimization on the virtual networks, it has been shown that it is possible to obtain more free resources as well as having the physical resources better balanced. Finally, it was shown that virtual networks are quite resilient to failures on the physical network.
A virtualização de rede é vista como uma abordagem promissora para ultrapassar o “Impasse da Internet” e permitir inovação na Internet, possibilitando assim uma migração fácil para novas abordagens de redes, bem como a coexistência de arquiteturas de redes complementares numa infraestrutura compartilhada e em ambiente comercial. Recentemente tem crescido de forma bastante significativa o interesse pela virtualização de rede por parte dos operadores e dos grandes fabricantes, desde que os potenciais benefícios da virtualização se tornaram claros, tanto de ponto de vista económico como operacional. No início, o conceito foi versado pelo meio académico, onde foram realizadas provas de conceito de pequena escala, e em que a virtualização de rede foi considerada como forma de investigação de novos protocolos. Esta Tese de Doutoramento tem como objetivo geral dotar uma rede de operador de um conjunto de mecanismos e algoritmos capazes de gerir e controlar redes virtuais. Para este fim, é proposta uma framework que visa alocar, monitorizar e controlar recursos virtuais de uma forma centralizada e eficiente. De forma a analisar o desempenho da framework, procedeu-se à sua implementação e avaliação numa rede de pequena dimensão. De forma a permitir que se possa efetuar uma alocação eficiente, em tempo real, e a pedido, de redes virtuais numa rede física, é proposta uma heurística para efetuar o mapeamento na rede física. Para que o operador de rede possa rentabilizar ao máximo a sua infraestrutura de rede, é ainda proposta uma formulação matemática que, através de programação linear, visa maximizar o número de redes alocadas na infraestrutura de rede. Dado que o consumo energético de uma infraestrutura de rede começa a ter significância nos custos de operação, é importante que se faça a alocação das redes virtuais no menor número de recursos físicos e também em recursos físicos ativos. Para endereçar este desafio é proposta uma formulação matemática que visa minimizar o consumo energético da rede física sem afetar a eficiência da alocação de redes virtuais. Para minimizar a fragmentação da infraestrutura de rede e ao mesmo tempo aumentar as receitas do operador, é também estendida a formulação inicial para contemplar a re-otimização de redes virtuais previamente mapeadas, fazendo com que o operador tenha um melhor aproveitamento da sua infraestrutura física. Será ainda necessário endereçar a migração de redes virtuais, quer por motivos de balanceamento de carga, quer por motivos de falha iminente de recursos físicos, sem afetar o bom funcionamento da rede virtual. Para este fim, é proposto um método baseado em técnicas de clonagem, para efetuar a migração de redes virtuais entre recursos da infraestrutura física de forma transparente e sem impacto para a rede virtual. De forma a avaliar a resiliência das redes virtuais a falhas na rede física, e ao mesmo tempo obter a solução ótima de migração de redes virtuais em caso de falha iminente dos recursos físicos, a formulação matemática é estendida para minimizar o número de nós migrados em simultâneo com a realocação de ligações virtuais. Em comparação com as nossas propostas de otimização verificou-se que as heurísticas existentes para mapeamento de redes virtuais têm um desempenho muito baixo. Verificou-se ainda que é possível efetuar a redução do consumo energético sem a penalização da alocação eficiente. Com a re-otimização das redes virtuais mostrou-se que é possível obter mais recursos livres, assim como obter uma melhor distribuição dos recursos. Por último, demonstrou-se que as redes virtuais são bastante resilientes a falhas na rede física.
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Ul, Amin Riaz. "Cooperative & cost-effective network selection : a novel approach to support location-dependent & context-aware service migration in VANETs." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6468/.
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Vehicular networking has gained considerable interest within the research community and industry. This class of mobile ad hoc network expects to play a vital role in the design and deployment of intelligent transportation systems. The research community expects to launch several innovative applications over Vehicular Ad hoc Networks (VANETs). The automotive industry is supporting the notion of pervasive connectivity by agreeing to equip vehicles with devices required for vehicular ad hoc networking. Equipped with these devices, mobile nodes in VANETs are capable of hosting many types of applications as services for other nodes in the network. These applications or services are classified as safety-critical (failure or unavailability of which may lead to a life threat) and non-safety-critical (failure of which do not lead to a life threat). Safety-critical and non-safety-critical applications need to be supported concurrently within VANETs. This research covers non-safety-critical applications since the research community has overlooked this class of applications. More specifically, this research focuses on VANETs services that are location-dependent. Due to high speed mobility, VANETs are prone to intermittent network connectivity. It is therefore envisioned that location-dependence and intermittent network connectivity are the two major challenges for VANETs to host and operate non-safety-critical VANETs services. The challenges are further exacerbated when the area where the services are to be deployed is unplanned i.e. lacks communication infrastructure and planning. Unplanned areas show irregular vehicular traffic on the road. Either network traffic flows produced by irregular vehicular traffic may lead to VANETs communication channel congestion, or it may leave the communication channel under-utilized. In both cases, this leads to communication bottlenecks within VANETs. This dissertation investigates the shortcomings of location-dependence, intermittent network connectivity and irregular network traffic flows and addresses them by exploiting location-dependent service migration over an integrated network in an efficient and cost-effective manner.
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Kibru, Shomoro Abenezer. "EXAMINING FACTORS INFLUENCING NETWORK EXPERT‟S DECISION WHETHER TO RECOMMEND INTERNET PROTOCOL (IP) MIGRATION (IPV4 to IPV6) OR NOT IN ORGANIZATIONS." Thesis, Högskolan i Borås, Institutionen Handels- och IT-högskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18130.
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Findings of this research work provide clear understanding of why organizationaltechnology(Network technology) adoption decision makers decide to recommend or notrecommend an Internet Protocol migration(adoption of the latest protocol), or a migrationfrom Ipv4 to IPv6/ or adoption of IPv6, to their organizations. A meticulous review ofliterature on the practice of various organizations technology adoption process served as abase for developing relevant research questions and corresponding hypothesis. The researchhypothesis was developed to examine organization‟s technology (Network technology)adoption decision maker‟s perception of IPv6: quality of service, auto configurationcapability, security, mobility, address abundance and cost effectiveness and its effect on theirdecision.The study result indicated that network expert‟s decision to recommend a new networktechnology adoption, specifically, internet protocol migration from IPv4 to IPv6 is highlyinfluenced by their perception of the factors listed in the previous paragraph, thereforenetwork expert‟s perception of the aforementioned factors are instrumental for their decisionof recommending whether to encourage the internet protocol migration. It is also implied thatmanagers at top level can make a technology adoption or migration decision based on therecommendation from the experts already knowing that their decision is highly influenced bytheir perception of capabilities and functionality of the new IP (IPv6). In addition to theapparent contribution of this study to organizations that fall in to the category of organization,where this study was conducted, the result of this study also helps different organizationsengaged in other kinds of business activity, such as: network infrastructure manufacturersand application developers by providing essential information regarding which functionalitiesand capabilities are playing a major role for organization‟s choice for a certain networkinfrastructure.Program: Masterutbildning i Informatik
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Maddocks, Rhiannon, and Ronja Ulvfot. "‘Children on the move are children first’ : A Critical Analysis of Position Papers on Children on the Move from the European Network of Ombudspersons for Children." Thesis, Linköpings universitet, Tema Barn, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-153486.
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With children on the move at the forefront of policy-making and research in Europe in recent years, it has been argued that children’s rights are increasingly encroached upon through tighter immigration controls and inconsistent policy interventions. The European Network of Ombudspersons for Children (ENOC) is an institution that aims to address children’s rights violations at a regional level throughout Europe, meaning that it should in its promotion of core children’s rights ensure a balance is reached between provision, participation and protection in addressing policy problems relating to children on the move. Through a discourse analysis this thesis critically examines how problems are represented in ENOCs position statements, and how ENOC represent and construct children and childhood in relation to children on the move. Our analysis indicated that the statements were predominantly based within a rights-based approach, especially where longer-term strategies were promoted. This reveals that ENOCs emphasis on the need for children’s rights to take precedence over state sovereignty, that children’s rights to participation and non- discrimination is accentuated over child protection perspectives, and that the recognition of the heterogeneity of the experiences of children on the move is endorsed. However, whilst ENOC seeks to move away from stereotypical notions of the migrant child, by promoting their agency and heterogeneity, children on the move are also represented in isolation in the position papers. Disassociated from family and adult migrants, children on the move are constructed as victims, vulnerable, dependent and in need of special care and assistance. In this light, their construction conveys a notion of complexity, however, it is also evident that their vulnerability is fostered in order to receive the protection and support they are entitled to, whether at a regional, European or international level.
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Zetterberg, John. "Migration Stories : A Case Study on the Life Course, Social Networks and Mobility Intentions of Refugees in Hofors." Thesis, Stockholms universitet, Kulturgeografiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145103.
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This thesis explores the mobility intentions of refugees in Hofors. The aim is to apply the theoretical framework of the life course perspective and social network theory; evaluating their suitability in approaching the topic of refugees’ mobility intentions in the Swedish countryside. The research questions ask how the life courses, social networks, and the specific locality influences their mobility intentions. The empirical research is based on biographical interviews and participatory mapping with refugee migrants residing in Hofors and an expert interview with a municipal employee. The findings illuminate: the role and dominance of different life domains at different timings (e.g. importance of the work domain in the initial stages of integration), the function of social networks as a resource of information, and the social context offered by Hofors (facilitating certain resources) – indicating the central importance of this conjunction, between the needs of trajectories within certain life domains and the ability of the locality to satisfy these needs, in influencing the mobility intentions. The research is situated in the field of international migration to the Swedish countryside, focusing on how rural municipalities can retain more refugees, by addressing the issue from the perspective of refugee migrants.
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Veenstra, Arno. "Putting behavioral assays on fish to the test: Are sociality and scototaxis trials relevant in the wild?" Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172154.
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Animal behavior has become a frequently used tool in modern ecology and ecotoxicology, where laboratory behavioral traits are recognized as sensitive endpoints for assessing natural behavior or non-lethal effects of pollutants on animals. Within these research fields, behavioral traits measured in laboratory environments have been used to formulate predictions of ecological consequences that accompany specific behavior. However, the predictive power of behavioral traits measured in simplified laboratory environments for complex natural aquatic ecosystems has been questioned. In this study, I have examined to what extent behavioral changes, noted in laboratory settings in response to chemical stressors (an anxiolytic drug) or visual cues of black and white bottom substrates, are also expressed in the wild. In my first experiment, I scrutinized whether reduced social behavior previously shown to occur in the lab for European perch (Perca fluvatilis) in response to oxazepam also occurs within a natural lake subjected to oxazepam. The in situ behavior was measured using high temporal resolution (3 sec) acoustic telemetry. In my second experiment, I assessed if the Atlantic salmon’s (Salmo salar) preference for black bottom substrates (scototaxis) in laboratory assays could be utilized for guiding migrating Atlantic salmon in situ. I show that: i) Oxazepam does not affect the social (association) behavior or the social network structure of perch in natural settings, in contrast to laboratory-based predictions; ii) Atlantic salmon show a preference for black bottom substrates both in laboratory- and natural environments. My study with oxazepam underlines that abiotic environmental factors and collective decision making in-situ, can override the anti-social behavioral effects of oxazepam on perch in a natural Lake. However, there seems to be potential in using laboratory behavioral assays to predict behavior in the wild, given that there is a tendency for migrating salmon to follow black bottom substrates both in laboratory environments and in streams.
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Howard, Brandon Daniel. "Shear and Composition Effects on Porous Network Properties and the Permeability of Lipid Films." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1593680466745792.
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Bekono, Nina Pelagie. "Impact du changement du protocole de routage dans un réseau." Thesis, Université Clermont Auvergne (2017-2020), 2018. http://www.theses.fr/2018CLFAC058/document.
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Les protocoles de routage dans les réseaux peuvent être amenés à changer pour de nombreuses raisons : la détection d'un événement particulier, un changement de topologie planifié ou non, la mobilité des nœuds, l'obsolescence de version, etc. Ces changements ne pouvant être simultanément détectés ou pris en compte par tous les nœuds du réseau, il est nécessaire de considérer le cas où certains nœuds utilisent le protocole de routage initial, tandis que d'autres ont migré vers le nouveau protocole de routage. Les travaux de cette thèse portent sur le problème de boucles de routage susceptibles d'apparaître dans ce contexte, et qui dégradent considérablement les performances du réseau. Nous proposons des solutions d'ordonnancement des nœuds, dans le but de contrôler la migration afin d'éviter ces boucles. Premièrement, nous considérons le contexte des réseaux statiques et des protocoles centralisés avec pour cas particulier le changement de métriques dans le réseau. Nous proposons deux solutions d'évitement des boucles centralisées : SCH-m (amélioration mineure d'un protocole existant), et ACH (nouvelle contribution), basées sur l'identification des boucles de routage dans les composantes connexes que contient l'union des deux protocoles de routage. Nous accélérons la migration du réseau par une opération de fusion étape par étape des différentes transitions produites. Deuxièmement, nous évoluons vers les protocoles distribués en conservant le contexte statique du réseau, et considérons le cas particulier du retrait ou de la panne d'un nœud. Nous proposons également deux solutions : RTH-d (amélioration mineure d'un protocole existant) et DLF (nouvelle contribution traitant les boucles de taille 2) basées sur un échange de messages entre les nœuds tant pour la détection de la panne que pour la notification de la migration. Troisièmement, nous considérons le contexte de mobilité des nœuds, et étudions les performances de DLF-k (version améliorée de DLF qui prend en compte les boucles de taille inférieures ou égales à k, avec k >= 2) sur deux types d'applications : les applications avec un unique nœud mobile qui est la destination, et les applications avec un groupe de nœuds mobilesRouting protocols in networks may change for many reasons: detection of a particular event, planned or unplanned change of topology, mobility of nodes, version obsolescence, etc. As these changes can not be simultaneously detected or taken into account by all nodes of the network, it is necessary to consider the case where some nodes use the initial routing protocol, while others have migrated to the new routing protocol. The work of this thesis deals with the problem of routing loops that may appear in this context, and which considerably degrade the performance of the network. We propose node scheduling solutions to control migration to avoid these loops. First, we consider the context of static networks and centralized protocols with the particular case of changing metrics. We propose two centralized avoidance solutions: SCH-m (minor improvement of an existing heuristic), and ACH (new contribution), based on the identification of the routing loops in the strongly connected components contained in the union of the two routing protocols. We accelerate the migration of the network by a step-by-step merge operation of the different transitions produced. Second, we evolve towards the distributed protocols while preserving the static context of the network, and consider the particular case of the withdrawal or breakdown of a node. We also propose two solutions: RTH-d (minor improvement of an existing heuristic) and DLF (new contribution for loops of size 2) based on message exchange of nodes for both failure detection and for migration notification. Thirdly, we consider the context of nodes mobility, and study the performance of DLF- k (improved version of DLF which takes into account loops of size less than or equal to k, with k >= 2) on two types of applications: applications with a single mobile node that is the destination, and applications with a group of mobile nodes
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Barcelos, Daniel. "Modelo de migração de tarefas para MPSoCs baseados em redes-em-chip." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/14783.
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Em relação a sistemas multiprocessados integrados em uma única pastilha (MPSoC), tanto a alocação dinâmica quanto a migração de tarefas são áreas de pesquisa recentes e abertas. Este artigo propõe uma organização de memória híbrida para sistemas com comunicação baseados em redes-em-chip, como maneira de minimizar a energia gasta durante a transferência de código decorrente de uma alocação ou migração de tarefa. É também introduzido um novo mecanismo de migração de tarefas, que, por sua vez, pode utilizar check-pointing ou outra técnica mais transparente. O aumento do uso de sistemas multiprocessados na computação embarcada torna importante a avaliação de diferentes organizações de memória. Enquanto memórias distribuídas proporcionam acessos mais rápidos, memórias compartilhadas tornam possível o compartilhamento de dados sem a interferência dos processadores. Nos experimentos realizados, foi focada a redução da energia gasta na comunicação em um contexto onde uma migração de tarefas ou uma alocação dinâmica fosse necessária. Os resultados indicam que, considerando a migração do código, a solução proposta apresenta melhor eficiência do que soluções unicamente distribuídas ou compartilhadas. Foi também verificado que, em alguns casos, a estratégia híbrida reduz os tempos de migração. Na solução apresentada, o código pode ser transferido do nó onde a tarefa era originalmente executada ou de uma memória posicionada no centro da rede. A escolha entre as duas opções é feita em tempo de execução de uma maneira intuitiva, sendo a escolha baseada na distância entre os nós envolvidos na transferência. Os resultados indicam que a organização proposta reduz a energia de transferência de código em 24% e 10% em média, se comparada, respectivamente, a soluções utilizando somente memória global ou distribuída. O modelo de migração de tarefas proposto é baseado na linguagem Java e na comunicação por troca de mensagens. Todo seu desenvolvimento se deu em software, não requerendo nenhuma modificação no sistema. O custo energético da migração foi então avaliado. Entende-se por custo energético a energia gasta nos processadores para envio e recebimento das mensagens e na estrutura de comunicação, uma rede-em-chip. Trabalhos já existentes não consideram o custo de migração, comparando apenas o arranjo inicial e final das tarefas no sistema. Este trabalho, entretanto, avalia todo o processo de migração. Através de experimentos, é estimado o tempo mínimo de execução da plataforma, como função do tamanho da tarefa e da distância entre os nós da rede, necessário para amortizar a energia gasta no processo de migração, considerando que os processadores utilizam a técnica de DVS para reduzir o consumo de acordo com suas cargas de processamento.Regarding embedded Multi-processor Systems-on-Chip (MPSoCs), dynamic task allocation and task migration are still open research areas. This work proposes a hybrid memory organization for NoC-based systems as the way to minimize the energy spent during the code transfer when task migration or dynamic task allocation needs to be performed. It is also introduced a new flexible task migration mechanism, which can use check-pointing or a more transparent technique. The increasing use of multi-processor architectures in embedded computing makes it important to evaluate different options for memory organization. While distributed memory allows faster accesses, a global memory makes possible the sharing of data without processor interference. In the experiments, it is targeted the communication energy reduction in a context where task migration or dynamic task allocation is required. Results indicate that the proposed hybrid memory organization presents better efficiency than distributed- or global-only organizations regarding code migration. It is also noticed that, in some cases, the hybrid strategy reduces the task migration times. In the hybrid approach, the code can be transferred from the node where the task was originally running or from a memory positioned at the center of the system. The choice between the two options is done at runtime in a very intuitive way, based on the distance between the nodes involved on the transfer. Results are very encouraging and indicate that the proposed hybrid organization reduces the code transfer energy by 24% and 10% on average, as compared to global- and distributed-only memory organizations, respectively. The proposed migration model is based on the Java language and on message passing communication method. It is mainly software-based, and does not require any system modification. The energy cost of the migration process is then evaluated, i.e., the energy spent on the sending and receiving cores and on the communication structure, a wormhole-based Network-on-Chip (NoC). Previous works have compared system figures before and after task migration, while this study evaluates the whole migration process. Finally, it is derived the minimum execution time of the embedded system, as a function of the task size and of the distance between the cores on the NoC, that is required to amortize the energy spent on the migration process, considering that processors use Dynamic Voltage Scaling to reduce power consumption according to their current workloads.
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Mezzapesa, Mélanie. "Mahorais à La Réunion : entre dynamiques migratoires, stratégies d'adaptation et recompositions identitaires dans le quartier de La Chaumière." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR051/document.
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Fondée sur une ethnographie de longue durée à La Chaumière, cette thèse souhaite prendre pour objet l’analyse de la migration mahoraise dans les processus de constructions identitaires propres à La Réunion. Les migrants mahorais deviennent alors un enjeu et un objet des politiques locales qui questionnent leur place au sein de la société réunionnaise. À partir d’une imprégnation quotidienne, l’analyse d’un territoire délimité – La Chaumière – permet de comprendre à l’échelle départementale les modalités de migration, les stratégies d’adaptation et l’émergence de nouvelles territorialités des populations en provenance de Mayotte et des Comores en contexte réunionnais. En effet, ce choix d’analyser un groupe dans un cadre territorial bien délimité dans une ville où la politique locale tend à la mise en valeur de sa diversité ethnico-religieuse, permet ainsi d’évaluer les différentes modalités de construction des projets migratoires et d’implantation de ces familles françaises originaires de Mayotte. Venue du dernier département français, la majorité de sa population est musulmane, dite de tradition bantoue, et émigre massivement vers La Réunion depuis les années 2000. Les modalités de migration et les stratégies d’adaptation sont complexes, et interpellent la cohabitation culturelle et cultuelle réunionnaise. Un multiculturalisme constamment réinterrogé par les différentes problématiques d’habitat et de chômage, l’augmentation des conflits et des discours racistes, et par les réflexions sur l’identité réunionnaiseBased on a long-term ethnography in La Chaumière district, this thesis wants to analyse the mahoran migration and the identity construction processes in Reunion island. The mahoran migrants become a challenge for local policies, it poses a question a what place for the mahoran migrants in the reunion society. Starting from a daily observation, these analysis of a delimitated territory – La Chaumière – makes it possible to understand the methods of migration, the adaptation strategies and the emergence of new territorialities of this population who comes from Mayotte Island and Comorian Union to Reunion Island from a departemental point of view. Moreover, this choice to study a group within a territorial framework delimited in a city where local policy tends to develop cultural and religious diversity allows to evaluate the various methods of migratory construction projects and the establishment of these French families from Mayotte Island. Coming from the lastest French department, the majority of its population is Muslim, with some bantu tradition and has massively emigrated in Reunion island since the 2000’s. These migration methods and these adaptation strategies are complex and challenge the cultural and cultual Reunion island cohabitation. A multiculturalism constantly questioned by the living place and unemployment problems, the increase of racist conflicts and speeches, and by the reflection of the reunion identity
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Lyngstad, Marta Oltedal. "Refuge Beyond Safety: A Study on Syrian Refugees in Jordan Preparing for Irregular Onwards Travel to Europe." Thesis, Malmö högskola, Fakulteten för kultur och samhälle (KS), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-22812.
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The aim of this study is to get an enhanced understanding of why and how young Syrian refugee males in Jordan prepare for irregular travel to Europe. Through eight semi-structured interviews with Syrians in their 20s and 30s residing in Amman, and a conceptual framework of life plan, existential mobility and social network theory, this research hopefully enhances our understanding of the dynamic and uncertain process of onwards irregular refugee travel. I conclude that discrepancies between the narrative of self and the actual situation may trigger secondary migration, while the social capital inherent in the social network of an individual is essential in the preparation phase of onwards movement. Moreover, the results indicate that latent ties are use actively to assess the reliability of the large pool of information accessed through membership in social media networks.
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Silva, Gustavo Girão Barreto da. "Estudo sobre o impacto da hierarquia de memória em MPSoCs baseados em NoC." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/67147.
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Ao longo dos últimos anos, os sistemas embarcados vêm se tornando cada vez mais complexos tanto em termos de hardware quanto de software. Ultimamente têm-se adotado como solução o uso de MPSoCs (sistemas multiprocessados integrados em chip) para uma maior eficiência energética e computacional nestes sistemas. Com o uso de diversos elementos de processamento, redes-em-chip (NoC - networks-on-chip) aparecem como soluções de melhor desempenho do que barramentos. Nestes ambientes cujo desempenho depende da eficiência do modelo de comunicação, a hierarquia de memória se torna um elemento chave. Baseando-se neste cenário, este trabalho realiza uma investigação sobre o impacto da hierarquia de memória em MPSoCs baseados em NoC. Dentro deste escopo foi desenvolvida uma nova organização de memória fisicamente centralizada com diferentes espaços de endereçamentos denominada nDMA. Este trabalho também apresenta uma comparação entre a nova organização e outras três organizações bastante difundidas tais como memória distribuída, memória compartilhada e memória compartilhada distribuída. Estas duas ultimas adotam um modelo de coerência de cache baseado em diretório completamente desenvolvido em hardware. Os modelos de memória foram implementados na plataforma virtual SIMPLE (SIMPLE Multiprocessor Platform Environment). Resultados experimentais mostram uma forte dependência com relação à carga de comunicação gerada pelas aplicações. O modelo de memória distribuída apresenta melhores resultados conforme a carga de comunicação das aplicações é baixa. Por outro lado, o novo modelo de memória fisicamente compartilhado com diferentes espaços de endereçamento apresenta melhores resultados conforme a carga de comunicação das aplicações é alta. Também foram realizados experimentos objetivando analisar o desempenho dos modelos de memória em situações de alta latência de comunicação na rede. Resultados mostram melhores resultados do modelo de memória distribuída quando a carga de comunicação das aplicações é alta e, caso contrário, o modelo nDMA apresenta melhores resultados. Por fim, foram analisados os desempenhos dos modelos de memória durante o processo de migração de tarefas. Neste caso, os modelos de memória compartilhada e compartilhada distribuída apresentaram melhores resultados devido ao fato de que não se faz necessária o envio dos dados da aplicação nestes modelos e também devido ao menor tamanho de código se comparado com os outros modelos.In the past few the years, embedded systems have become even more complex both on terms of hardware and software. Lately, the use of MPSoCs (Multi-Processor Systems-on-Chip) has been adopted on these systems for a better energetic and computational efficiency. Due to the use of several processing elements, Networks-on-Chip arise as better performance solutions than buses. Considering this scenario, this work performs an investigation on the impact of memory hierarchy in NoC-based MPSoCs. In this context, a new physically centralized and shared memory organization with different address spaces named nDMA was developed. This work also presents a comparison between the new memory organization and three different well-known memory hierarchy models such as distributed memory and shared and distributed shared memories that make use of a fully hardware cache coherence solution. The memory models were implemented in the SIMPLE (SIMPLE Multiprocessor Platform Environment) virtual platform. Experimental results shows a strong dependency on the application communication workload. The distributed memory model presents better results as the application communication workload is low. On the other hand, the new memory model (physically shared with different address spaces) presents better results as the application communication workload is high. There were also experiments aiming at observing the performance of the memory models in situations where the communication latency on the network is high. Results show better results of the distributed memory model when the application communication workload is high, and the nDMA model presents better results otherwise. Finally, the performance of the memory models during a task migration process were evaluated. In this case, the shared memory and distributed shared memory models presented better results due to the fact that in this case the data memory does not need to be transferred from one point to another and also due to the low size of the memory code in these cases if compared to other memory models.
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Proponnet-Guérault, Mathilde. "Exploration de la signalisation de la migration cellulaire dans le cancer du sein par la biologie des réseaux ERRα Expression in Bone Metastases Leads to an Exacerbated Antitumor Immune Response." Thesis, Université Grenoble Alpes, 2020. https://thares.univ-grenoble-alpes.fr/2020GRALV047.pdf.
Full textAbstract:
La migration cellulaire est au cœur de nombreux processus physiopathologiques. Elle est régie par une machinerie cellulaire complexe reposant sur l’action combinée des récepteurs adhésifs et des récepteurs tyrosine kinase contrôlant la dynamique du cytosquelette, et essentielle au processus de migration. Cependant les interrelations fonctionnelles et physiques entre ces voies de signalisation sous-jacentes demeurent méconnues à ce jour ce qui limite la découverte de nouvelles thérapies, notamment celles anti- métastatiques.Mon travail de thèse s’est d’abord focalisé sur la signalisation de la migration en essayant d’appréhender le lien fonctionnel indirect entre la mono-ubiquitination d’ICAP-1, mais aussi AKAP9 et PKA, deux régulateurs putatifs de la vitesse de migration mécano-dépendante. En l’état actuel de nos connaissances, cette partie s’est avéré très peu fructueuse, ce qui a souligné la nécessité de développer une approche plus intégrative des réseaux de signalisation pour en appréhender leur complexité. Cette approche permet en effet de mieux rationnaliser les hypothèses expérimentales en intégrant l’ensemble des connaissances du domaine, et, de fait, de mieux appréhender la complexité des signalisations croisées au cœur du processus physiopathologiques de la migration cellulaire. Cette stratégie a été appliquée dans le cadre d’une collaboration qui a permis d’identifier une signalisation TGFβ3-ERRa au cœur de la modulation du système immunitaire de la niche métastatique osseuse du cancer du sein, ce qui nous a permis de valider l’approche.Dans la seconde partie de ma thèse, cette approche a permis d’identifier un nouvel axe de signalisation entre PKA et un oncogène, AXL un récepteur tyrosine kinase au cœur de la migration dans le cancer du sein triple négatif, suggérant ainsi l’importance de PKA dans cette pathologie. Enfin, en étendant l’approche de biologie des réseaux de signalisation, le développement d’une nouvelle méthodologie d'identification de drogues a permis d’identifier de potentiels repositionnements d’indication ayant un effet sur la migration et le cycle cellulaire d’un modèle cellulaire de cancer du sein triple négatif, de type mésenchymateux. La méthodologie mise en place pourrait être utilisée dans l’évaluation préliminaire toxicologique de composés chimiques en définissant les mécanismes d’action qui les relient avec la physio-pathologie de la migration, dont les processus métastatiquesCell migration is at the heart of many physio pathological processes. It is governed by a complex cellular machinery based on the combined action of adhesive receptors and tyrosine kinase receptors controlling cytoskeletal dynamics and essential to the migration process. However, the functional and physical interrelationships between these underlying signaling pathways remain poorly understood to date, which limits the discovery of new therapies, particularly those for metastatic disease.My project was first focused on migration signaling by trying to understand the indirect functional link between the mono-ubiquitination of ICAP-1, but also AKAP9 and PKA, two putative regulators of the mechano-dependent migration rate. In the current state of our knowledge, this part proved to be very unsuccessful, which underlined the need to develop a more integrative approach to signaling networks in order to understand their complexity. Indeed, this approach allows to better rationalize experimental hypotheses by integrating all the knowledge in the field, and, in fact, to better understand the complexity of cross signaling at the heart of the physio pathological process of cell migration. This strategy was applied in a collaboration that identified a TGFβ3-ERRa signaling involved in the modulation of the immune system of the bone metastatic niche of breast cancer, which allowed us to validate the approach.In the second part of my thesis, this approach allowed the identification of a new signaling axis between PKA and an oncogene, AXL a receptor tyrosine kinase at the heart of migration in triple negative breast cancer, suggesting the importance of PKA in this pathology. Finally, by extending the signaling network biology approach, the development of a new drug identification methodology has allowed the identification of potential repositioning of indications having an effect on the migration and cell cycle of a mesenchymal triple negative breast cancer cell model. The established methodology could be used in the preliminary toxicological evaluation of chemical compounds by defining the mechanisms of action that link them with the pathophysiology of migration, including metastatic processes
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Anderson, Cory Alexander. "Theoretical Implications of the Beachy Amish-Mennonites." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397586906.
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