Dissertations / Theses on the topic 'Hybrid Migration'

Migration to the cloud has been a popular topic in industry and academia in recent years. Despite many benefits that the cloud presents, such as high availability and scalability, most of the on-premise application architectures are not ready to fully exploit the benefits of this environment, and adapting them to this environment is a non-trivial task.Therefore, many organizations consider a gradual process of moving to the cloud with Hybrid Cloud architecture. In this paper, the author is making an effort of analyzing particular enterprise case in cloud migration topics like cloud deployment, cloud architecture and cloud management.This paper aims to identify, classify, and compare existing challenges in cloud migration, illustrate approaches to resolve these challenges and discover the best practices in cloud adoption and process of conversion teams to the cloud.

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.

L’originalité de notre apport parmi les recherches sociologiques et anthropologiques roumaines porte sur l’analyse de la relation multidimensionnelle entre la migration et l’habitation rurale, mettant l’accent sur la compréhension du logement comme lieu de rencontre des modèles culturels différents. En effet, la maison doit être analysée comme un produit social et par rapport à la vie sociale et privée de la famille qui y réside. Donc, notre cadre théorique s’appuie sur le croisement entre l’analyse sociologique des processus migratoires et leur expression architecturale et matérielle. La question centrale de la recherche porte sur les continuités et discontinuités - observées par rapport à la tradition - qu’on trouve, après la chute du communisme, dans les habitations des migrants roumains, issus du milieu rural. Pour répondre à cette question, nous avons choisi une approche anthropologique du logement, en menant des enquêtes de terrain, de type qualitatif (auprès de villageois et migrants de village de Marginea), durant les années 2009, 2010 et 2011. On remarque que les nouvelles maisons se présentent comme des formes hybrides, qui articulent les références locales aux éléments nouveaux, apportés par la migration. Ainsi, nous avons introduit deux dimensions essentielles dans l’analyse du concept de la maison du migrant: les «traces du passé» et les «traces de la migration». La première dimension se réfère aux influences des anciennes formes, modèles, pratiques, mentalité etc., alors que la deuxième dimension désigne les éléments nouveaux et les innovations qui ont pénétré dans la conception, la construction et l’utilisation des maisons
The originality of our contribution to the Romanian sociological and anthropological research concerns the analysis of the multidimensional relation between migration and the rural dwelling, emphasizing an understanding of the house as the meeting place of the different cultural models. Indeed, the house must be analyzed as a social product, with regard to the social and private life of the family which dwells there. Thus, our theoretical frame is based on the interplay between the sociological analysis of the migratory processes and their architectural and material expression. The central question of our research concerns the continuities and the discontinuities - observed with regard to the local tradition - which we find, after the fall of the communism regime, in the houses of the Romanian migrants, of rural origin. To answer this question, we chose an anthropological approach to the house, by conducting a qualitative field research (with villagers and migrants of Marginea village), in 2009, 2010 and 2011. We noticed that the new houses appear as hybrid forms, which articulate the local models to the new elements, brought by migration. So, we introduced two essential dimensions into the analysis of the concept of the migrant house: the "traces of the past" and the "traces of the migration". The first dimension refers to the influence of the old forms, models, practices, mentalities etc., while the second dimension indicates the new elements and innovations which penetrated the house design, its construction process and its exploitation
Originalitatea contributiei noastre noastre intre cercetarile sociologice si antropologice romanesti consta in analiza relatiei multidimensionale migratie-locuinta rurala, subliniind intelegerea locuintei migrantilor din tara de origine ca loc de intalnire a diferitelor modele culturale. Intr-adevar, casa trebuie vazuta ca un produs social si in relatie cu viata sociala si privata a familiei ce o locuieste. In consecinta, cadrul teoretic si de analiza imbina analiza sociologica a migratiei internationale cu expresia arhitecturala si materiala a acesteia. Intrebarea centrala a cercetarii priveste continuitatile si discontinuitatile - observate in raport cu modelele de dinainte de 1989 – ce se manifesta, dupa caderea regimului comunist, in proiectarea, realizarea si utilizarea locuintelor migrantilor din mediul rural. Pentru a raspunde la aceasta intrebare, am optat pentru o abordare antropologica a locuintelor migrantilor, realizand un studiu de caz in comuna Marginea, jud. Suceava. Anchetele de teren s-au desfasurat in intervalele iulie – octombrie 2009, iulie-octombrie 2010 si in august 2011. Am remarcat cum locuințele migrantilor se prezinta asemenea unor forme hibride ce combina elementele noi, aduse de migratie (« urmele migratiei »), cu referintele locale, de dinainte de 1989 (« urmele trecutului »). Am introdus astfel doua dimensiuni esentiale in analiza conceptului de locuinta a migrantului in tara de origine: « urmele trecutului » si « urmele migratiei ». Prima dimensiune se refera la influentele vechilor forme, modele, practici, mentalitati etc., in timp ce a doua dimensiune indica elementele noi si inovatiile ce au patruns in proiectarea, construirea si utilizarea acestor case

Doutoramento em Informática
The evolution and maturation of Cloud Computing created an opportunity for the emergence of new Cloud applications. High-performance Computing, a complex problem solving class, arises as a new business consumer by taking advantage of the Cloud premises and leaving the expensive datacenter management and difficult grid development. Standing on an advanced maturing phase, today’s Cloud discarded many of its drawbacks, becoming more and more efficient and widespread. Performance enhancements, prices drops due to massification and customizable services on demand triggered an emphasized attention from other markets. HPC, regardless of being a very well established field, traditionally has a narrow frontier concerning its deployment and runs on dedicated datacenters or large grid computing. The problem with common placement is mainly the initial cost and the inability to fully use resources which not all research labs can afford. The main objective of this work was to investigate new technical solutions to allow the deployment of HPC applications on the Cloud, with particular emphasis on the private on-premise resources – the lower end of the chain which reduces costs. The work includes many experiments and analysis to identify obstacles and technology limitations. The feasibility of the objective was tested with new modeling, architecture and several applications migration. The final application integrates a simplified incorporation of both public and private Cloud resources, as well as HPC applications scheduling, deployment and management. It uses a well-defined user role strategy, based on federated authentication and a seamless procedure to daily usage with balanced low cost and performance.
O desenvolvimento e maturação da Computação em Nuvem abriu a janela de oportunidade para o surgimento de novas aplicações na Nuvem. A Computação de Alta Performance, uma classe dedicada à resolução de problemas complexos, surge como um novo consumidor no Mercado ao aproveitar as vantagens inerentes à Nuvem e deixando o dispendioso centro de computação tradicional e o difícil desenvolvimento em grelha. Situando-se num avançado estado de maturação, a Nuvem de hoje deixou para trás muitas das suas limitações, tornando-se cada vez mais eficiente e disseminada. Melhoramentos de performance, baixa de preços devido à massificação e serviços personalizados a pedido despoletaram uma atenção inusitada de outros mercados. A CAP, independentemente de ser uma área extremamente bem estabelecida, tradicionalmente tem uma fronteira estreita em relação à sua implementação. É executada em centros de computação dedicados ou computação em grelha de larga escala. O maior problema com o tipo de instalação habitual é o custo inicial e o não aproveitamento dos recursos a tempo inteiro, fator que nem todos os laboratórios de investigação conseguem suportar. O objetivo principal deste trabalho foi investigar novas soluções técnicas para permitir o lançamento de aplicações CAP na Nuvem, com particular ênfase nos recursos privados existentes, a parte peculiar e final da cadeia onde se pode reduzir custos. O trabalho inclui várias experiências e análises para identificar obstáculos e limitações tecnológicas. A viabilidade e praticabilidade do objetivo foi testada com inovação em modelos, arquitetura e migração de várias aplicações. A aplicação final integra uma agregação de recursos de Nuvens, públicas e privadas, assim como escalonamento, lançamento e gestão de aplicações CAP. É usada uma estratégia de perfil de utilizador baseada em autenticação federada, assim como procedimentos transparentes para a utilização diária com um equilibrado custo e performance.

Mincom, a successful Australian software company, markets an enterprise product known as the Mincom Information Management System, or MIMS. MIMS is an integrated suite of modules covering materials, maintenance, financials, and human resources management. MIMS is an on-line transaction processing (OLTP) system, meaning it has special requirements in the areas of pe,jormance and scalability. MIMS consists of approxiniately 16 000 000 lines of code, most of which is written in COBOL. Its basic architecture is 3-tier client/server, utilising a database layer, application logic layer, and a Graphical User Inte,face (GUI). While this architecture has proved successful, Mincom is looking to gradually evolve MIMS into a distributed architecture. COREA is the target distributed framework. The development of an enterprise distributed system is fraught with difficulties. Key technical problems are not yet solved, and Mincom cannot afford the risk and cost involved in rewriting MIMS completely. The only viable approach is to gradually evolve MIMS into the desired architecture using a hybrid system that allows clients to access existing and new functionality. This thesis addresses the design and development of distributed systems, and the evolution of existing legacy systems into this architecture. It details the current MIMS architecture, and explains some of its shortcomings. The desirable characteristics of a new system based on a distributed architecture such as COREA are outlined. A case is established for a gradual migration of the current system via a hybrid system rather than a complete rewrite. Two experimental systems designed to investigate the proposed new architecture are discussed. The conclusion reached from the first, known as Genesis, is that the maturity of CORBA for ente1prise development is not sufficient-12-18 months are estimated to be required for the appropriate level of maturity to be reached. The second system, EGEN, demonstrates how workflow can be integrated into a distributed system. An event-based workflow architecture is demonstrated, and it is explained how a workflow event server can be used to provide workflow services across a hybrid system. EGEN also demonstrates how a middleware gateway can be used to allow COREA clients access to the functionality of the existing MIMS system. Finally, a proposed migration strategy for moving MIMS to a distributed architecture based on COREA is outlined. While developed specifically for MIMS, this strategy is broadly applicable to the migration of any large 3-tier client/server system to a distributed architecture.

Neuronal migration is an essential aspect of nervous system development; improper or incomplete neuronal migration can lead to debilitating disorders. The model organism Caenorhabditis elegans has 302 neurons and is ideal for studying nervous system development. The cytoplasmic adaptor protein, MIG-10, is necessary for the long range anteroposterior migration during embryogenesis of the neurons CAN, ALM, and HSN. Mutations in the mig-10 gene result in incomplete migrations of all three neurons. MIG-10 is a homologue of the vertebrate proteins lamellipodin and RIAM-1, which are involved in directing actin polymerization during axon outgrowth and guidance. RIAM-1 is known to interact with proteins from the Ras GTPase family. The MIG-10 protein has a pleckstrin homology (PH) domain, a Ras-associating (RA) domain, and a proline-rich region. We used a yeast two-hybrid system to investigate which Ras family proteins MIG-10 interacts with. Three isoforms of MIG-10, MIG-10A, MIG-10B, and MIG-10C, as well as the RAPH domain alone, were used as baits. No evidence of interaction was observed for any of the baits used. These results do not reject our hypothesis as the constitutively active Ras clones may need to be used or there may not be a direct interaction between MIG-10 and the Ras family members. We are currently screening a C. elegans cDNA library for interactions with all three isoforms of MIG-10. In the future we plan to investigate how MIG-10 may be involved in the WAVE/SCAR actin nucleation pathway.

This one-year master's thesis investigates the late part of the Middle Neolithic on the island of Gotland. This thesis has been written without the influence of a singular theoretical pespective, and has therefore seen input from the processual, and postprocessual theories. By using several perspectives, an attempt is made to view the material remains used in the most objective manner possible. The specific aim of this thesis is to investigate whether the Mid-Neolithic inhabitants of Gotland were a part of the Corded Ware culture (or as it is called in Sweden, the Battleaxe culture or the Boataxe culture). Most recent literature has concluded that Gotland was never a part of the Battlexe culture, though this thesis has discovered many parallels with the mainland culture, including the production of similar objects and ritual practices. There are indications that the Gotlandic culture also integrated traits from several other coastal regions of the Baltic Sea, something most Battle Axe settlements did not. After investigating all the data that have been linked with the Battleaxe culture, this thesis concludes that the people on the island of Gotland were not fully assimilated to the Battleaxe culture, but were approaching the culture in both a material and ritual aspects. This leaves the conclusion that the Gotlandic culture towards the end of the Middle Neolithic was somewhat of a hybrid.

P4 is a high-level language for programming the data plane of a network switch. These P4-programmable switches come with no pre-defined behavior or protocols, so it is entirely up to the loaded P4 program to define these. This allows the user to exclude any unwanted functionality and to create custom protocols. It also removes the dependence on the switch vendor in terms of both trust and addition of new features. This thesis looks at migration from traditional switches to P4-programmable ones. Since no behavior is included out-of-the-box in the P4 switches, a search is made for open-source P4 projects and the functionality they provide is evaluated. It is found that most link layer functionality can be achieved with them, with the exception being loop prevention by spanning tree protocols. Therefore, one of the projects is extended with an implementation of the Rapid Spanning Tree Protocol based on the IEEE 802.1D-2004 standard. Finally, partial migration of networks to P4 switches and to the Software Defined Networking (SDN) paradigm is studied based on a literature review. Four general approaches and specific architectures for these are found, and it is concluded that such a hybrid network can still benefit from P4 and having a centralized SDN controller.

Migration is a phenomenon wherein individuals relocate from one country to another, albeit temporarily or permanently, for numerous reasons. The State of Qatar is a highly diverse nation with a large population of foreign residents. According to Priya D’Souza, as of 2017, 60 percent of the resident population in Qatar are from South Asia. Growing up in this environment, third culture kids develop a unique, hybrid culture through experiencing multiple cultures. This research investigates a dichotomy of belonging from the perspective of South Asians in Qatar. A series of hybridized spinning tops were produced in collaboration with a South Asian artisan. These hybridized artifacts are infused with sensory materials in order to elicit an emotive response, engage memory, and celebrate the merging of diverse cultures.

Software engineering practices have experienced significant changes over the period of past two decades. Keeping in view the competitive market trends, now is the high time for many organizations to shift from traditional waterfall models to more agile technologies like Scrum [22][23]. A change of this magnitude is often not easy to undertake. The reason that both software engineering techniques are different in many respects, organizations require considerable amount of analysis of the whole transitioning process and possible scenarios that may occur along the way. Small and medium organizations are normally very skeptical to the change of this magnitude. The scale of change is not limited to only software processes, in fact, difficult part is to deal with old attitudes and thinking processes and mold them for the new agile based Scrum development. The process of change therefore need to be understood in the first place and then carefully forwarded to the implementation phase.

Mobile business solutions are one of the most attractive market segments of mobile information services. The third generation of mobile communication systems (3G) will be a significant step forward in the convergence of telecommunications and datacommunications industries. More specifically, the convergence of mobile technologies and the Internet allows compelling possibilities for future applications and solutions. However, most current mobile businesses and mobile application and solution providers are rather contributing to the process of convergence; many current ideas and solutions are based on the restrictions of existing mobile networks combined with Internet-based services. In the future, when mobile networks and the Internet have merged, it will no longer be possible to create revenue with these types of solutions. One concrete solution is the mobile middleware concept, bridging the mobile technologies and Internet world. This Master’s thesis studies the middleware concept for providing business applications in the light of 3G, making strategic recommendations to a provider of these kinds of services. A comprehensive discussion about the developments after 3G is introduced. Alternative solutions are presented and some strategic implications are introduced. The implications are motivated by an industry survey, carried out within this project. The topic of over-the-air data synchronization is discussed as an example for interim middleware. Mobile computing file system issues are seen as an interesting opportunity for business applications. The possibility of remote desktop screen access is studied, and measurements proving its feasability for hosted wireless application service provision are made. Emerging mobile Java technologies are discussed as an efficient platform for providing ubiquitous, device independent end-to-end solutions. As one of the recommended strategies, this thesis introduces the concept of hybrid thickness client applications as a feasible solution for migrating from current middleware solutions to an (uncertain) future of native, thick terminal applications, within a scope of two years. Based on this concept, a prototype for a 3G smartphone application was developed as an example. A set of possible strategic scenarios is presented and discussed. This thesis also discusses operator differentiation and business solutions in an all-IP based world. 3G networks and handset devices will introduce a large number of new applications and business opportunities, but such a change will also introduce new challenges and risks. The migration challenge is being illustrated in the case of Smartner, a mobile middleware solution provider focusing on business applications. As shown by this case, compared to current enabling solutions, a major shift in technologies is seen as needed, in order to maintain long-term success.
Mobila affärssystem bildar ett av de mest attraktiva marknadssegment inom mobila informationstjänster. Den tredje generationens mobila kommunikationssytem (3G) kommer att bli ett viktigt steg fram mot konvergensen mellan telekommunikationsoch datakommunikationsindustrin. Särskilt konvergensen som äger rum mellan mobila teknologier och Internet erbjuder utmanande möjligheter för framtida applikationer och lösningar. De flesta nuvarande företag och tjänster inom mobilbranschen kan dock snarast betraktas som ett bidrag till denna konvergens. Många av de nuvarande idéerna och lösningarna är nämligen baserade på avgränsningar och problem som uppstår vid kombination av mobila system med Internet-baserade tjänster. I framtiden, när mobila nät har vuxit ihop med Internet till en symbios, kommer det inte längre att vara möjligt att förtjäna på detta slag av lösningar. En konkret lösning är det mobila middleware-konceptet, som bildar en logisk koppling mellan mobila teknologier och Internet-världen. Detta examensarbete studerar middleware-konceptet från en 3G-orienterad synvinkel och framför strategiska råd för företag som erbjuder detta slag av tjänster. En detaljerad diskussion om utvecklingen efter 3G presenteras. Arbetet lägger fram alternativa lösningar och strategiska implikationer deriveras. Implikationerna är motiverade bl.a. av en intervjuunders ökning som utfördes i samband med detta arbete. Temat trådlös datasynkronisering diskuteras som ett exempel för provisorisk middleware. Mobila filsystem införs som en intressant möjlighet för affärsapplikationer. Diverse möjligheter för fjärrkontroll av en arbetsplatsstation studeras och mätningar bevisar deras genomförbarhet för trådlösa applikationstjänster. Framträdande mobila Java-teknologier analyseras och presenteras som ett efficient underlag för plattformoberoende end-to-end-lösningaröver lag. En av de rekommenderade strategierna är baserad på det hybrida klientkonceptet, vilket presenteras som en realistisk lösning förövergången från nuvarande middleware-system till en (osäker) framtid av nativa, tjocka terminalapplikationer. Den strategiska horisonten för detta är två år. Utgående från detta koncept utvecklades en prototyp som exempel för en sådan applikation. Arbetet definerar och diskuterar dessutom diverse strategiska scenarier. Slutligen nämns problematiken om operatörernas framtida differentieringsmöjligheter och rollen av affärssystem i en fullständigt IP-baserad värld. 3G nät och terminaler kommer att skapa ett stort antal nya användningar och affärsmöjligheter, men ändringen kommer också att medföra nya utmaningar och risker. Detta illustreras med hjälp av företaget Smartner som exempel för en leverant ör av mobila middleware-lösningar för affärsanvändningar. Som demonstrerat i detta fall, anses i jämförelse med nuvarande applikationslösningar en signifikant teknologisk reorientering vara nödvändig, för att bevara ett långvarigt perspektiv.
Langattomat yrityssovellukset ovat nykyään yksi kiinnostavimmista mobiilimarkkinoiden segmenteistä. Kolmannen sukupolven (3G) mobiilit viestintäjärjestelmät tulevat olemaan merkittävä askel kohti telekommunikaatioja dataliikennealojen yhdistymist ä (ns. konvergenssia). Itse asiassa mobiiliteknologian ja Internetin lähentyminen mahdollistaa entistä hyödyllisempien mobiilisovellusten ja -ratkaisuiden rakentamisen tulevaisuudessa. Tällä hetkellä useat mobiiliyritykset ja mobiilisovellusten tuottajat ovat kuitenkin osana tätä yhdistymisprosessia. Monet nykyiset ideat ja ratkaisut ottavat nimittäin lähtökohdakseen rajoitukset, joita nykyiset tietoliikenneverkot asettavat yhdistyessään Internet-pohjaisiin palveluihin. Tulevaisuudessa, kun mobiiliverkot ja Internet ovat yhdistyneet, ei ole enää mahdollista ansaita rahaa tällaisten perinteisten ratkaisuiden avulla. Yksi konkreettinen ratkaisumalli perustuu mobile middleware -käsitteeseen, joka liittää yhteen mobiiliteknologian ja Internetin. Tässä diplomityössä tutkitaan middleware- käsitettä yrityssovellusten tarjoamisessa erityisesti 3G-verkoissa, ja työssä esitellään strategisia suosituksia näiden sovelluspalveluiden tarjoajille. Työssä käyd ään perusteellisesti läpi kolmannen sukupolven jälkeistä kehitystä. Vaihtoehtoisia ratkaisuja esitellään, ja joitakin strategisia vaikutuksia tuodaan myös esille. Vaikutuksia perustellaan tuloksilla, joita tämän projektin osana tehty kysely paljasti. Tiedon langatonta synkronisointia tarkastellaan esimerkkinä tilapäisestä middlewaresta. Mobiileihin tiedostojärjestelmiin liittyvät asiat nähdään mielenkiintoisena mahdollisuutena yrityssovelluksille. Toimistojärjestelmien etäkäyttömahdollisuuksia on tutkittu ja niiden sopivuutta langattomaan sovellustarjontaan on mitattu. Kehittyviä mobiileja Java-teknologioita pidetään tehokkaana alustana, jonka avulla voidaan tarjota kaikkialla saatavilla olevia, päätelaiteriippumattomia ratkaisuja loppuasiakkaille. Yhtenä suositelluista strategioista tämä diplomityö esittelee yksinkertaisen päätelaitesovellusmallin, jonka avulla nykyisistä middleware-ratkaisuista voidaan siirtyä tulevaisuuden kehittyneempiin päätelaiteratkaisuihin kahden vuoden sisällä. Tähän konseptiin perustuen työssä on kehitetty esimerkki 3G-älypuhelimen sovelluksesta. Lisäksi esitellään ja arvioidaan mahdollisia strategisia skenaariovaihtoehtoja. Tämä diplomityö käsittelee myös operaattoreiden differointimahdollisuuksia ja yrityssovelluksia täysin IP-pohjaisissa verkoissa. 3G-verkot ja -päätelaitteet tuovat mukanaan laajan valikoiman uusia sovelluksia ja liiketoimintamahdollisuuksia, mutta tämä muutos merkitsee myös uusia haasteita ja riskejä. Tätä haastetta kuvataan tutkimuksen esimerkkiyrityksen Smartnerin tapauksessa, joka on yrityssovelluksiin fokusoitunut mobiilien middleware-ratkaisuiden tarjoaja. Tutkimus tuo esille, miten Smartnerin nykyiset sovellukset huomioon ottaen tarvitaan valtava teknologinen suunnanmuutos pitkäaikaisen perspektiivin säilyttämiseksi.

This study explores the engagement with music among second-generation migrants in Sweden in connection to their cultural identity and sense of belonging. First, a theoretical frame is developed that illustrates how music practices can contribute to the creation of ‘sense of place’ and ‘sense of belonging’ and how they are linked to ‘collective memory’ and ‘cultural identity’. Consequently, it is also explained how all this can be understood from a ‘generational perspective’. A qualitative approach has been chosen for this study and semi-structured interviews with 9 emerging adults living in Sweden, were conducted. The main results show that there is a high engagement with music among second-generation migrants in Sweden, many of them possessing a broad repertoire of favorite songs and genres. Mainly, it is through listening to the music coming from the home countries of their parents that they can express and navigate their cultural identities. Such kind of music carries meanings and mediates collective experiences and memories which can be passed on from one generation to the next one. These practices are important for second-generation migrants in terms of their sense of belonging to certain groups with which they can identify and feel connected to. In this sense, such kind of music helps them make sense of themselves in the world and in connection to others.

Contexte : Le pronostic clinique du glioblastome, la tumeur cérébrale primaire la plus agressive chez l'adulte, reste mauvais (Stupp et al. 2005). La nanomédecine pourrait fournir de nouveaux outils thérapeutiques pour surmonter les limitations actuelles. Les nanoparticules hybrides d'or et de gadolinium Au@DTDTPA(Gd) sont étudiées pour leur potentiel radiosensibilisant in vitro et in vivo (Alric et al. 2008 et Miladi et al. 2014). L'objectif principal de ce travail de thèse est d'évaluer in vitro et in vivo le potentiel anti-invasif des Au@DTDTPA(Gd) associées à la radiothérapie.Résultats : A partir des cultures cellulaires 2D et 3D in vitro, des cultures organotypiques ex vivo et du modèle de fenêtre crânienne in vivo sur la lignée infiltrante U251 et la lignée radiorésistante U87, nous avons évalué le potentiel anti-invasif des nanoparticules Au@DTDTPA(Gd) avec ou sans la radiothérapie. Les nanoparticules seules réduisent la capacité invasive des sphéroïdes U251 mais n'est pas liée à l'activité protéolytique MMP2 et l'expression MMP14. Elles réduisent également les capacités des cellules U251 à migrer à la fois collectivement et individuellement. Parallèlement, les nanoparticules affectent les capacités biomécaniques des cellules U251, qui sont marquées par une hausse du nombre et du diamètre des fibres d'actine au niveau des protrusions cellulaires, une rigidité membranaire renforcée. Ces modifications sont associées à une hausse des forces de traction des cellules, de l'expression des protéines d'adhésion et une diminution du nombre de protrusions. L'ensemble de ces données expliqueraient l'inhibition de la motilité cellulaire des cellules U251 par les nanoparticules Au@DTDTPA(Gd). Nous avons ensuite mis en évidence les effets des Au@DTDTPA(Gd) associées à différents protocoles de radiothérapie sur la lignée cellulaire U87 radiorésistante. Les suivis in vitro 3D, ex vivo et in vivo indiquent une diminution de la progression des cellules U87. Nous avons développé un modèle 3D in vitro qui permet de récupérer les cellules migratrices issues des sphéroïdes traités. Après traitement, nous avons observé que les Au@DTDPA(Gd) seules ou en combinaison avec la radiothérapie diminuaient le nombre de cellules migratrices, ainsi que leur viabilité par induction de catastrophes mitotiques. Le traitement combiné diminue également à la fois la sécrétion et l'activité de MMP2 dans les cellules migratrices. Les observations en microscopie de fluorescence révèlent une perte des jonctions intercellulaires et une expression compromise de la Cx43 dans les jonctions intercellulaires La mise en culture des cellules migratrices dans un milieu neurosphère permettant une sélection des cellules souches a permis de montrer que les cellules migratrices traitées forment moins de neurosphères et possèdent un diamètre réduit. Ces résultats suggèrent que les cellules migratrices perdraient leurs caractéristiques souches.Conclusion : L'ensemble de nos résultats suggère que les nanoparticules Au@DTDTPA(Gd) possèdent des effets anti-invasifs, en perturbant les capacités biomécaniques des cellules de GBM. De plus, les Au@DTDTPA(Gd) combinées à la radiothérapie réduisent les propriétés invasives des cellules migratrices de GBM en induisant des catastrophes mitotiques, une perte des jonctions intercellulaires et une atténuation de leur caractère souche. Ces résultats montrent que les Au@DTDTPA(Gd) et la radiothérapie possèdent un potentiel thérapeutique pour de futures études précliniques
Background: The clinical prognosis of glioblastoma, the most aggressive primary brain tumor in adults, remains poor (Stupp et al. 2005). Nanomedicine could provide new therapeutic tools to overcome current limitations. Au@DTTPA(Gd) gold-gadolinium hybrid nanoparticles are being studied for their radiosensitizing potential in vitro and in vivo (Alric et al. 2008 and Miladi et al. 2014). The main objective of this thesis work is to evaluate in vitro and in vivo the anti-invasive potential of Au@DTDTPA(Gd) associated with radiotherapy.Results: From 2D and 3D in vitro cell cultures, ex vivo organotypic cultures and in vivo cranial window model on the infiltrating line U251 and the radioresistant line U87, we evaluated the anti-invasive potential of Au@DTDTPA(Gd) nanoparticles with or without radiotherapy. Nanoparticles alone reduce the invasive capacity of U251 spheroids but are not related to MMP2 proteolytic activity and MMP14 expression. They also reduce the abilities of U251 cells to migrate both collectively and individually. At the same time, nanoparticles affect the biomechanical capacities of U251 cells, which are marked by an increase in the number and diameter of actin fibers at the level of cell protrusions, an enhanced membrane rigidity. These changes are associated with an increase in cell traction forces, expression of adhesion proteins and a decrease in the number of protrusions. All these data would explain the inhibition of cell motility of U251 cells by Au@DTTPA(Gd) nanoparticles. We then highlighted the effects of Au@DTDTPA(Gd) associated with different radiotherapy protocols on the radioresistant U87 cell line. The in vitro 3D, ex vivo and in vivo follow-ups indicate a decrease in the progression of U87 cells. We have developed a 3D in vitro model that allows the recovery of migratory cells from treated spheroids. After treatment, we observed that Au@DTDPA(Gd) alone or in combination with radiotherapy decreased the number of migratory cells, as well as their viability by induction of mitotic catastrophes. The combined treatment also decreased both the secretion and activity of MMP2 in migrating cells. Fluorescence microscopy observations reveal a loss of intercellular junctions and compromised expression of Cx43 in intercellular junctions. Culture of migratory cells in a neurosphere medium allowing stem cell selection showed that treated migratory cells form fewer neurospheres and have a reduced diameter. These results suggest that migratory cells would lose their stem-like characteristics.Conclusion: Our overall results suggest that Au@DTTPA(Gd) nanoparticles possess anti-invasive effects by disrupting the biomechanical capabilities of GBM cells. Moreover, Au@DTDTPA(Gd) combined with radiotherapy reduce the invasive properties of migrating GBM cells by inducing mitotic catastrophes, loss of intercellular junctions and attenuation of their stemness. These results show that Au@DTDTPA(Gd) and radiotherapy have therapeutic potential for future preclinical studies

L'objectif de ce travail est d'étudier les phénomènes de déformation photo-induite de matière dans les films minces polymères incorporant des molécules d'azobenzène. Cette étude s'appuie sur une expérience originale qui consiste à observer in-situ la cinétique de formation d'un réseau de surface sous illumination du film photochromique par une figure d'interférence. L'observation est basée sur l'utilisation de techniques couplées de microscopie à sonde locale qui permettent de corréler la morphologie photo-induite et la distribution du champ électromagnétique avec une résolution très inférieure au pas du réseau. Cette étude, menée en fonction de la polarisation de la lumière et de l'épaisseur des films, démontre qu'au moins quatre mécanismes microscopiques interviennent dans la déformation photo-induite des azo-polymères : la réorientation optique des photochromes, la réorganisation locale de la matrice, le transport dirigé de matière, le photo-blanchiment. La contribution de ces différents mécanismes est plus particulièrement révélée par l'existence de deux phénomènes observés pour la première fois. D'une part, la cinétique de déformation présente une transition entre deux régimes, l'un, au temps court, en phase avec l'excitation lumineuse et l'autre, au temps long, en opposition de phase. D'autre part, la morphologie des réseaux photo-induits dépend de façon spectaculaire de l'épaisseur des couches. L'ensemble des résultats obtenus apporte un nouvel éclairage sur certaines observations expérimentales antérieures, parfois contradictoires, notamment sur la différence entre les réponses d'un même matériau à une excitation optique en champ proche et champ lointain
The main goal of this PhD work is to study photo-induced matter deformation phenomena in thin polymeric film containing azobenzene moieties. This study is based on the in-situ observation of surface relief gratings kinetic of formation under illumination by an interference pattern. The observation relies on a coupled microscopy technique, allowing to correlate photo-induced morphology with the electromagnetic field distribution, with a resolution better than the lattice pitch. The study as a function of the light polarisation and of the film thickness shows that four microscopic mechanisms are involved in the photo-induced deformation of the azo-polymer: the optical reorientation of chromophore, the local reorganization of the matrix, oriented matter transport and the photobleaching. The contribution of these different mechanisms is evidenced by two phenomena observed for the first time. First, the kinetic of deformation presents a transition between two regimes, one, at short time, in phase with the light excitation, the other, at longer time, in opposition of phase. Second, the morphology of the induced relief grating depends strongly on the film thickness. This PhD work shed light on previous and somehow contradictory results, in particular in term of response of azo-polymer films at an excitation in near filed and far field optics

Zuo, Cheng.
Thesis M.Phil. Chinese University of Hong Kong 2015.
Includes bibliographical references (leaves 49-51).
Abstracts also in Chinese.
Title from PDF title page (viewed on 21, September, 2016).

碩士
國立東華大學
資訊工程學系
103
The migration mechanism can provide services, computing jobs and resources moved from a virtual environment to another virtual environment and can be categorized into resource migration, host migration and network migration. The network migration mechanism can move all virtual machines within the subnet, including services, storage space and other resources to another subnet, while retaining the network topology and network infrastructure. To achieve the objective of network migration, in the paper, we proposed a migration mechanism that can move all virtual machines and the network environment to another set of machines on a hybrid cloud environment. The proposed solution is implemented based on Open Flow and XEN, and use of existing network protocols. The emulation results show that the proposed solution can provide very good performance.

碩士
國立臺北大學
資訊工程學系
99
Before the cloud concept being proposed, organizations built their own private cloud environment to support their own computing resources consumption. But it is not efficient since most of the time the computing resources are idled. Cloud computing provides a new charging concept, pay as you go. The computing resource is on-demand. Public cloud providers build their own computing farm and rent the resources to the costumers. But there are some disadvantage moving all the organization’s computing resource to the cloud. Hence the hybrid cloud is being proposed. The hybrid cloud model allows organizations to build their own private cloud for their basic usage, while using the public clouds’ resource when needed. By connecting the public cloud and private cloud together, organizations can dynamically manage the computing resource, so that the organization can run jobs at a minimum cost while guarantee certain efficiency. But the problem of how to dynamically set up the environment is still remains. We proposed an agent-based intelligent software migration framework. With the framework, agents will automatically monitor the execution environment both in private cloud and public cloud. The agents will dynamically set up or shut down computing resources according to all the jobs’ status. After resizing the computing resources, the agents will migrate some jobs to public cloud to increase the total system’s efficiency. We also proposed three kinds of policy that can be used on hybrid cloud environment. The policy will decide when the computing resource needs to be resized, and which job will be migrated to the public cloud.

碩士
大同大學
資訊工程學系(所)
100
Live migration is an important function in the virtual machine. Pre-copy and Post-copy are two technologies of Live migration. Pre-copy Live migration technology has the characteristics of the low downtime, but to running a write-intensive program will result in high total migration time. Post-copy live migration technology has the characteristics of the low total migration time, but has higher downtime. Trying to have a better balance between downtime and total migration time, this paper presents a Hybrid copy architecture, combined with the Pre-copy and Post-copy. Hybrid copy architecture uses the two Pre-copy iterations to reduce the number of pages needs to send in pull phase, and then determine whether to effectively reduce the dirty page number. If effectively, then enter the Pre-copy branch. If not effectively, then enter the Pre-copy branch. Hybrid copy architecture to running write-intensive programs and Comprehensive type programs, the downtime can be reduced by 14% to 50%, the total migration time can be reduced by 22% to 33%. Hybrid copy architecture can present a balance Pre-copy live migration and Post-copy live migration.

碩士
國立臺灣科技大學
電子工程系
104
When applications need a large amount of I/O, SSDs can provide a better performance than HDDs. As a result, data with frequent accesses could be allocated to SSDs in order to improve performance. However, the SSDs’ price is more expensive than HDDs, so we have to make proper data migration between HDDs and SSDs. In the thesis, we will propose a priority-based object migration design for NoSQL databases in a hybrid storage system. The method can place high-priority data in SSDs with fast access property and allocate low-priority data to HDDs with low cost to improve the performance of NoSQL databases. The experimental results also show that the proposed method can achieve the goal.

碩士
國立東華大學
資訊工程學系
104
Migration is an important research issue in cloud computing. For example, when the some emergency situations, the computers for the cloud computing servers should be closed, we need to move the cloud computing resources from a virtual environment to another virtual environment. The network migration can be used to move the entire cloud computing resources and network configuration from a computer center to another computer center. In our paper, we proposed the live network migration solution based on the mobile IPv6 NEMO. The proposed solution uses tunnel technology to establish logical communication between the migrated computer center and the target computer center, and uses the binding updated to change the network topology. The experiment results show that the proposed solution can provide live network migration for the hybrid cloud network environment.

碩士
國立中央大學
化學工程與材料工程學系
103
Human adipose-derived stem cells (hADSCs) are one of the promising cell sources in regenerative medicine because they can be obtained in abundant quantity and harvested by minimally invasive procedure such as liposuction. Unlike embryonic stem cells (hESCs) and human induced pluripotent stem cells (iPSCs), adult stem cells do not generate the ethical concerns that accompany hESCs and are cultivated in relatively low cost. Furthermore, the xeno-free culture of hESCs and hiPSCs is difficult to achieve and/or are extremely costly. Therefore, hADSCs are considered to be a more attractive source of stem cells than hESCs and hiPSCs. However, hADSCs are limited for application because of their low pluripotency and differentiation ability compared with hESCs and hiPSCs. It is a critical issue how to maintain or increase the pluripotency of hADSCs. The adipose tissue was treated with collagenase to digest, followed by centrifugation in this study. Subsequently, stromal vascular fraction (SVF) was obtained. Cells in SVF were not only heterogeneous and contain many different types of cells leading to various genotypes but also held high pluripotency. Although hADSCs could be purified by culturing on tissue culture dishes, the pluripotency significantly decreased with time. In order to improve the clinical application of hADSCs, the hybrid membrane method that takes shorter time to purify hADSCs (i.e. less than 30 min) than conventional culture method (i.e. 5-12 days) has developed in this study where hADSCs are purified from SVF cell solution with extremely high purity and pluripotency. A SVF cell solution was permeated through the porous membranes with a pore size from 8 m to 25 m, and membranes were incubated in cell culture medium for 15-18 days. The hADSCs migrated from 10% PLGA/silk screens hybrid membranes contain an extremely high percentage (e.g. >95%) of cells positive for mesenchymal stem cell markers and express higher pluripotent genes (Oct4, Sox2, Klf4 and Nanog) than the cells after culturing by conventional culture method. It is noteworthy that the pluripotency of cells in SVF could be kept or even enhanced in permeate and recovery solution filtered by 10% PLGA/silk screen hybrid membranes. Besides, the alkaline phosphatase activity (ALP) was analyzed after 14 days. Alizarin red staining, von Kossa staining were observed after 28 days. It was indicated that cells in permeate and recovery solution purified by10% PLGA/silk screen hybrid membranes had higher ability to differentiate into osteoblasts compared with primary cells and cells after culturing by conventional culture method.

博士
國立成功大學
機械工程學系
102
The dissertation proposed a numerical model of hybrid finite-element and particle-in-cell method to simulate charged ion migration in the cross-channel capillary zone electrophoresis system. Analytes separated by capillary zone electrophoresis are governed by the ion migration with different charge-to-mass ratios. Different to the traditional numerical method, this method can be used to simulate the migration phenomenon of the differently charged ions for handling complex geometries and irregular boundary conditions in the capillary zone electrophoresis system. This research focused on the effects of Debye length and corner arc radius on the migration phenomena of the positive and negative ions in the injection and separation process. The numerical results indicate that these effects can affect obviously the migration phenomena of differently charged analytes as expressed in the following. The positive and negative ions are subject to opposite electric field force relative to the buffer solvent. Hence, the positive ions migrate into the separation channel faster than the negative ions. With decreasing the Debye length, the positive and negative ions are faster carried into the separation channel. Furthermore, more positive ions migrate into the separation channel and migrate more far away from the injection channel. Meanwhile, the negative ions migrate more close to the upper wall of the separation channel. The results indicate that the short Debye length can shorten time for the injection process and provide more analytes for the separation process. In the injection process, the positive and negative ions migrate not only faster into the separation channel but also more far away from the injection channel with increasing the corner arc radius. In the separation process, the zones of positive and negative ions are wider and the time to completely separate is longer with increasing the corner arc radius. Consequently, as corner arc radius is larger, more time is needed to inject and separate charged ions. The numerical results provide useful insights into the influences of the electric field on the migration of differently charged ions in capillary zone electrophoresis systems. These findings have significant implications for design and control of capillary zone electrophoresis systems.

碩士
國立成功大學
資訊工程學系
106
In recent years, emerging non-volatile memory (NVM) has favorable properties, such as low leakage and high density and has attracted a lot of attention. Among them, spin-transfer torque magnetoresistive random access memory (STT-MRAM) that has read speed comparable to SRAM is a good candidate to build large last-level caches (LLCs). However, STT-MRAM suffers from long write latency and high write energy. To mitigate the impact of asymmetric read/write energy and latency, hybrid cache designs have been proposed to combine the merits of STT-MRAM and SRAM and good block placement and migration policies are necessary to use the hybrid cache efficiently. In this thesis, we find that conflict miss occurs on L2 frequently causing the blocks thrash between L2 and LLC. If the thrashing block that cause write activities, i.e. dirty thrashing block, are placed in STT-MRAM of hybrid LLC, these will result in excessive energy consumption, especially in memory bound benchmarks. Therefore, this thesis proposes repetitive access aware placement and migration (RAP) to mitigate energy consumption caused by thrashing block. RAP places dirty thrashing blocks into SRAM and migrate clean thrashing blocks, which is evicted from SRAM, to STT-MRAM. RAP can reduce up to 38.04% and 19.96% reduction on average of LLC energy for running four copies of workloads on a four-core system. For a four-core system that runs mix workloads, our technique also can reduce up to 36.60% and 25.92% on average of LLC energy. When compared to the previous access aware policy and adaptive placement and migration policy, the proposed technique can reduce 20.20% on average (up to 35.68%) and 9.75.% on average (up to 26.67%) energy consumption with insignificant performance degradation. Evaluation results show large energy consumption reduction with minimal performance loss.

6 Summary Wetland plants share several common characters, such as clonality, wind pollination and self-compatibility that facilitate hybridization, especially in complexes of closely related taxa. In this thesis, a Sparganium erectum complex of four subspecies and 14 species of the genus Bolboschoenus were investigated to detect hybridization and verify the origins of putative hybrids. The first part of the thesis is dedicated to an introduction to hybridization, a process of great evolutionary impact, and its several general consequences, which are broadly discussed with numerous examples. In addition, an introduction to the studied taxa is provided as well as the main results of three papers that are presented and discussed herein. The second part of the thesis consists of three papers on hybridization within the Sparganium erectum aggregate (Paper I) and in the genus Bolboschoenus (Paper II, central European species; Paper III all 14 species worldwide). AFLP molecular marker analysis, sequencing of nuclear and chloroplast DNA, and genome size and morphometric analyses were applied to elucidate the genetic relationships among taxa and to confirm the suitability of morphometric characters for taxa and hybrid delimitation. The results clearly present the differentiation of individual taxa and their stable...

碩士
國立中央大學
化學工程與材料工程學系
107
Human adipose-derived stem cells, hADSCs, can be obtained by isolation from fat tissue, which is currently a more practical source of stem cells than human induced pluripotent stem cells (hiPSCs) and embryonic stem cells (hESCs). Currently, several clinical trials use hADSCs, whereas only a few clinical trials have been performed using hiPSCs and hESCs. However, hADSCs are known to show heterogeneous characteristics and contain different pluripotency and differentiation abilities. Therefore, it is expected that the stem cell characteristics, pluripotency, and differentiation abilities should be different for hADSCs isolated by different isolation methods. hADSCs are typically isolated by cell culture of stromal vascular fraction (SVF, primary hADSC solution) where the SVF solution can be obtained by collagenase digestion of fat tissues followed by centrifugation. The isolated hADSCs can possess different purity levels and divergent properties depending on the purification methods used. It is innovated that the membrane migration method through Nylon mesh filter purifies hADSCs from a fat tissue solution with extremely high purity and pluripotency in my laboratory. A primary fat-tissue solution was permeated through the porous membranes (e.g., Nylon mesh) with a pore size from 8 to 25 μm, and the membranes were incubated in cell culture medium for 15-18 days. In this study, I developrd a new membrane migration method using Nylon mesh membranes having optimal pore sizes, 11 and 20 μm, and PLGA/silk membranes where optimal extracellular matrix (ECM) was coated on the membranes, which could purify hADSCs. The isolated hADSCs are expected to have high pluripotency and high differentiation ability into chondrocytes, osteoblasts and adipocytes. hADSCs were isolated from adipose tissue by the membrane migration method where different membranes were used, e.g., (a) Nylon mesh and PLGA (poly (lactic-co-glycolic acid))/silk screen membrane, (b) Nylon mesh and PLGA/silk screen membrane coated with collagen type I, (c) Nylon mesh and PLGA/silk screen membrane coated with human recombinant-vitronectin, (d) Nylon mesh and PLGA/silk screen membrane coated with human fibronectin. Collagen type I is xeno-containing materials, whereas another extracellular matrices (ECMs) were xeno-free materials. The hADSCs that migrated from the membranes kept an extremely high percentage (e.g., >98%) expression of mesenchymal stem cell markers (CD44, CD73, and CD90) and showed almost one order of magnitude higher expression of some pluripotency genes (Oct4, Sox2, and Nanog) compared with cells isolated using the conventional culture method.

A hybrid FEM/FDM algorithm for particle migration of quasi-steady flow in concentrated suspension materials is proposed in this study. This hybrid FEM/FDM algorithm in which the planar variables, such as pressure field, are described in terms of finite element method, and gapwise variables of temperature, density concentration and time derivatives are expressed by finite difference method. The particle concentration inhomogeneities can be predicted, which is ignored by the existing injection molding simulation packages. Simulation results indicated that powder concentration variation could be significant in practical processing in PIM.
Singapore-MIT Alliance (SMA)

The contact zone between subspecies of house mouse Mus musculus musculus and Mus musculus domesticus is one of the most intensively studied hybrid zones. It is also due to extensive introgression of the Y chromosome of M. m. musculus subspecies to the genetic background of M. m. domesticus. One theory of the origin of the introgression explains it by intragenomic conflict between the sexes. With a set of variable microsatellite markers on the Y chromosome, I have examined the validity of this theory by simple approaches revealing the history of the introgression area. It turned out that overly big variability of our markers makes the revelation of this theory impossible. Our markers have been found suitable for use in the analysis of population structure of house mouse. Thanks to them, we can identify migrants between localities and estimate the level of closeness of the population structure in relation to migrants from the neighborhood. Populations in our analysis proved to be relatively closed and resistant to the influx of migrants. Despite the conclusions of previous research where the dispersion of males ran up to one kilometer, I have discovered a relatively large number of migrations to a distance of thirty kilometers. Keywords Mus musculus musculus, Mus musculus domesticus, Y chromosome,...

Dans le domaine de l'électronique pour la consommation de masse, les concepteurs sont tenus de fournir des systèmes embarqués qui doivent satisfaire des exigences de performance, de consommation, de co?t et de temps de mise sur le marché. Pour satisfaire toutes ces exigences, nous nous concentrons sur les systèmes sur puce multi-processeurs (MPSoCs) avec des processeurs configurables et des architectures hétérogènes. Comparés aux processeurs généralistes et aux circuits spécifiques à une application (ASICs), les processeurs configurables peuvent être utilisés pour équilibrer le rapport performance/nombre de transistors et la flexibilité. Dans cette thèse, les architectures hétérogènes sont définies comme un groupe de processeurs qui sont basées sur le même jeu d'instructions avec des extensions différentes. Cette thèse tente de résoudre les difficultés causées par les processeurs configurables et les architectures hétérogènes. En raison des processeurs configurables et de l'hétérogénéité, le champ des solutions d'implémentation devient extrêmement large et inclue des aussi bien des optimisations logicielles que des optimisationsmatérielles. C'est pourquoi nous présentons 4 niveaux d'abstraction différents avec des niveaux de détail et des vitesses de simulation différentes pour faciliter l'exploration des solutions d'implémentation. La méthode de simulation hybride est également intégrées à ces niveaux d'abstraction pour éviter les efforts d'adaption du logiciel dépendant du matériel (HdS pour Hardware dependant Software). En utilisant ces niveaux d'abstraction appliqués à ce genre de plateformes hétérogènes et configurables, nous avons construit un flot basé sur une exploration de l'ensemble des solutions d'implémentations sur des critères de budget. Réaliser une interface matériel/logiciel bien équilibrée est une tache complexe. Pour résoudre ce problème, nous utilisons le concept de graphe de dépendance des services (GdS) pour modéliser l'interface matériel/logiciel. Pour que l'implémentation choisie soit hautement performante et flexible, nous proposons un schéma de migration de taches dans lequel une tache peut être exécutée sur plusieurs processeurs compatibles avec différentes extensions d'instructions. Une application décodeur Motion-JPEG a été utilisée pour valider tous ces travaux.