Au cours de la dernière décennie, les outils d’enregistrement et de production musicale, les médias sociaux et les plateformes Web de vente et d’écoute de musique en ligne ont radicalement transformé l’industrie de la musique enregistrée. La baisse significative de vente d’albums et les nouveaux modèles de production, de diffusion et de promotion de la musique ont directement affecté les acteurs traditionnels comme les maisons de disques. Pendant que certains prévoyaient la fin de ces dernières au profit de l’autoproduction et de l’autopromotion, d’autres ont suggéré que les maisons de disques indépendantes pouvaient devenir des joueurs incontournables de ce nouvel environnement, pourvu qu’elles s’adaptent et développent une offre de services et une expertise répondant aux besoins réels des artistes. Ce mémoire s’intéresse à la façon dont les maisons de disques indépendantes québécoises perçoivent et utilisent les médias sociaux pour accroitre la visibilité des artistes qu’elles représentent. Dans cette étude de cas multiples, quatre maisons de disques indépendantes québécoises ont été sélectionnées. Des entretiens en profondeur ont été réalisés avec les chargés de projet Web de ces maisons de disques indépendantes afin de connaitre leur perception et leurs usages des médias sociaux, de même que les stratégies qu’ils emploient pour accroitre la visibilité des artistes qu’ils représentent sur le Web. Des données tirées d’observation des activités Web des quatre maisons de disques ont également été collectées. / During the last decade, music recording and production tools, social media, and platforms for selling and listening to music in streaming have radically transformed the industry of recorded music. The decline of album sales and new models of music production, distribution, and promotion have directly affected the traditional actors of the music industry such as record labels. While some predicted that these changes would bring an end to the records labels at the benefit of self-production and self-promotion, others suggested that independent record labels could become an essential part of this new environment, provided they adapt to it and develop new services and an expertise that meet the artists’ needs. This master thesis explores the visibility of independent Quebec music artists on the social web and the role record labels plays in it. In this multiple case study, four independent Quebec music labels were selected. In-depht interviews were conducted with the Web project managers of these music labels to discuss their perception and their usage of Web platforms, as well as the strategies they employ to increase the visibility on the Web of the artistes they represent. Observational data of the Web activities of the four music labels were also collected.

L’émergence de l’informatique dans les nuages met en avant de nombreux défis qui pourraient limiter l’adoption du paradigme Cloud. Tandis que la taille des données traitées par les applications Cloud augmente exponentiellement, un défi majeur porte sur la conception de solutions efficaces pour la gestion de données. Cette thèse a pour but de concevoir des mécanismes d’auto-adaptation pour des systèmes de gestion de données, afin qu’ils puissent répondre aux exigences des services de stockage Cloud en termes de passage à l’échelle, disponibilité et sécurité des données. De plus, nous nous proposons de concevoir un service de données qui soit à la fois compatible avec les interfaces Cloud standard dans et capable d’offrir un stockage de données à haut débit. Pour relever ces défis, nous avons proposé des mécanismes génériques pour l’auto-connaissance, l’auto-protection et l’auto-configuration des systèmes de gestion de données. Ensuite, nous les avons validés en les intégrant dans le logiciel BlobSeer, un système de stockage qui optimise les accès hautement concurrents aux données. Finalement, nous avons conçu et implémenté un système de fichiers s’appuyant sur BlobSeer, afin d’optimiser ce dernier pour servir efficacement comme support de stockage pour les services Cloud. Puis, nous l’avons intégré dans un environnement Cloud réel, la plate-forme Nimbus. Les avantages et les désavantages de l’utilisation du stockage dans le Cloud pour des applications réelles sont soulignés lors des évaluations effectuées sur Grid’5000. Elles incluent des applications à accès intensif aux données, comme MapReduce, et des applications fortement couplées, comme les simulations atmosphériques. / The emergence of Cloud computing brings forward many challenges that may limit the adoption rate of the Cloud paradigm. As data volumes processed by Cloud applications increase exponentially, designing efficient and secure solutions for data management emerges as a crucial requirement. The goal of this thesis is to enhance a distributed data-management system with self-management capabilities, so that it can meet the requirements of the Cloud storage services in terms of scalability, data availability, reliability and security. Furthermore, we aim at building a Cloud data service both compatible with state-of-the-art Cloud interfaces and able to deliver high-throughput data storage. To meet these goals, we proposed generic self-awareness, self-protection and self-configuration components targeted at distributed data-management systems. We validated them on top of BlobSeer, a large-scale data-management system designed to optimize highly-concurrent data accesses. Next, we devised and implemented a BlobSeer-based file system optimized to efficiently serve as a storage backend for Cloud services. We then integrated it within a real-world Cloud environment, the Nimbus platform. The benefits and drawbacks of using Cloud storage for real-life applications have been emphasized in evaluations that involved data-intensive MapReduce applications and tightly-coupled, high-performance computing applications.

Les applications data-intensive sont largement utilisées au sein de domaines diverses dans le but d'extraire et de traiter des informations, de concevoir des systèmes complexes, d'effectuer des simulations de modèles réels, etc. Ces applications posent des défis complexes tant en termes de stockage que de calcul. Dans le contexte des applications data-intensive, nous nous concentrons sur le paradigme MapReduce et ses mises en oeuvre. Introduite par Google, l'abstraction MapReduce a révolutionné la communauté intensif de données et s'est rapidement étendue à diverses domaines de recherche et de production. Une implémentation domaine publique de l'abstraction mise en avant par Google, a été fournie par Yahoo à travers du project Hadoop. Le framework Hadoop est considéré l'implémentation de référence de MapReduce et est actuellement largement utilisé à des fins diverses et sur plusieurs infrastructures. Nous proposons un système de fichiers distribué, optimisé pour des accès hautement concurrents, qui puisse servir comme couche de stockage pour des applications MapReduce. Nous avons conçu le BlobSeer File System (BSFS), basé sur BlobSeer, un service de stockage distribué, hautement efficace, facilitant le partage de données à grande échelle. Nous étudions également plusieurs aspects liés à la gestion des données intermédiaires dans des environnements MapReduce. Nous explorons les contraintes des données intermédiaires MapReduce à deux niveaux: dans le même job MapReduce et pendant l'exécution des pipelines d'applications MapReduce. Enfin, nous proposons des extensions de Hadoop, un environnement MapReduce populaire et open-source, comme par example le support de l'opération append. Ce travail inclut également l'évaluation et les résultats obtenus sur des infrastructures à grande échelle: grilles informatiques et clouds. / Data-intensive applications are nowadays, widely used in various domains to extract and process information, to design complex systems, to perform simulations of real models, etc. These applications exhibit challenging requirements in terms of both storage and computation. Specialized abstractions like Google’s MapReduce were developed to efficiently manage the workloads of data-intensive applications. The MapReduce abstraction has revolutionized the data-intensive community and has rapidly spread to various research and production areas. An open-source implementation of Google's abstraction was provided by Yahoo! through the Hadoop project. This framework is considered the reference MapReduce implementation and is currently heavily used for various purposes and on several infrastructures. To achieve high-performance MapReduce processing, we propose a concurrency-optimized file system for MapReduce Frameworks. As a starting point, we rely on BlobSeer, a framework that was designed as a solution to the challenge of efficiently storing data generated by data-intensive applications running at large scales. We have built the BlobSeer File System (BSFS), with the goal of providing high throughput under heavy concurrency to MapReduce applications. We also study several aspects related to intermediate data management in MapReduce frameworks. We investigate the requirements of MapReduce intermediate data at two levels: inside the same job, and during the execution of pipeline applications. Finally, we show how BSFS can enable extensions to the de facto MapReduce implementation, Hadoop, such as the support for the append operation. This work also comprises the evaluation and the obtained results in the context of grid and cloud environments.

L’industrie de la finance a connu une multiplication d’innovations qui peuvent bouleverser les services financiers traditionnels. Elles brouillent les frontières entre banques et start-ups, accélérèrent les transactions, démocratisent l'accès au crédit, tout en imposant aux régulateurs le défi de construire un cadre règlementaire qui rééquilibre le compromis entre stabilité financière, concurrence innovation.Dans cette thèse, d'abord je réponds à cette question : comment les innovations influencent-elles la concurrence dans la banque de détail ? Un premier enjeu consiste à comprendre pourquoi certains de ces services innovants sont offerts par les plateformes non-bancaires, et comment les banques peuvent rivaliser avec des participants qui appliquent un modèle d'affaire différent. Après, je regarde quels sont les facteurs d’adoption de l'innovation par les consommateurs. Pour répondre à cette question, j'étudie à l'aide d'outils d'analyse empirique l'exemple des deux principales plateformes de prêts peer-to-peer aux USA, Prosper et LendingClub. Pour terminer, je me demande si la réglementation de l'innovation est nécessaire. Est-il optimal pour la société de réglementer les fournisseurs de services innovants ? Je propose deux modèles théoriques qui s'inscrivent dans les débats bien connus sur le niveau optimal des interchanges dans les systèmes de cartes de paiement et des clauses de parité des prix et d'exclusivité sur les plateformes en ligne. / During the last years, the finance industry has experienced a proliferation of innovations which may disrupt traditional financial services. They blur the boundaries between banks and financial start-ups, speed up transactions, democratize the access to credit, revise how we can purchase goods and how merchants can sell their products, while imposing regulators the challenge for a new level playing field which balances the trade-off between financial stability, competition and innovation. In this thesis, I try to answer to three main issues related to the topic of innovation in retail banking. Firstly, how do innovations impact competition in retail banking. One first issue is to understand why some of these innovative services are offered by non-bank platforms and how can banks compete with entrants that do not have the same business model. Secondly, I look at what the drivers of the adoption of innovation by consumers in retail banking are. What determines the diffusion of a new financial technology despite all the financial risks related to it ? To answer to these questions, I will look empirically at the example of the two main peer-to-peer lending platforms in the USA, Prosper and LendingClub. Third, I address the question on whether regulation of innovation is necessary. Is it optimal for the society to regulate the providers of innovative retail banking services? To answer to these questions, I address, in two theoretical models, the well-known debates on the optimal level of interchange fees in payment card systems and the imposition of exclusivity arrangements and price parity clauses in contracts between platforms and merchants.

Background: All brands need to keep moving and to keep building their stories by bringing new and exciting products or experiences. During the last twenty years, companies have been more and more convinced that their brands are among their most valuable resources and today we see an increasing trend of brand extension attempts, however with a significant number of failures, as well.The strategies of how a brand extension should be done, have been published in several books during the last decades. Despite of this, some companies still do not see the link between brand extension and business development. There seem to be a certain lack of knowledge and understanding of the underlying factors that affect a brand extension. In this study, we would therefore like to examine and identify these different factors in order to create a greater understanding of branding strategies.Purpose: The purpose of this study is to research, describe and analyse the nature of horizontal brand extensions in order to create a theory regarding the essential key factors to take into consideration before considering an extension. Based on the theory, the hypothesis will be tested empirically in order to strengthen- or reject it.Methodology: This study is made with a deductive approach, where the theoretical framework, based on previous presented theories, has led to the conformation of our hypothesis, which has later on been applied to the findings from the empirical researches in order to confirm or discard our hypothesis.The empirical basis consists of qualitative interviews with respondents from two companies with experience from horizontal brand extension: Craft of Scandinavia and Peak Performance.Conclusion: Our conclusion from this research is that for a horizontal extension to be successful it must:‐ Be a part of a brand with a clear brand image and plan, for the brand ­‐ Fit the brand ‐ Live up to the original brand promise - Fit with the old associations and generate new, positive associations to the brand ­‐ Have high perceived quality and trust in the mind of the customer- Be a part of a risk evaluation in order to limit the risks and obtain a more realistic view of the extension. / Program: Textil produktutveckling med entreprenörs- och affärsinriktning

Methyl group transfer from S-adenosyl-l-methionine (AdoMet) to various substrates including DNA, proteins, and natural products (NPs), is accomplished by methyltransferases (MTs). Analogs of AdoMet, bearing an alternative S-alkyl group can be exploited, in the context of an array of wild-type MT-catalyzed reactions, to differentially alkylate DNA, proteins, and NPs. This technology provides a means to elucidate MT targets by the MT-mediated installation of chemoselective handles from AdoMet analogs to biologically relevant molecules and affords researchers a fresh route to diversify NP scaffolds by permitting the differential alkylation of chemical sites vulnerable to NP MTs that are unreactive to traditional, synthetic organic chemistry alkylation protocols. The full potential of this technology is stifled by several impediments largely deriving from the AdoMet-based reagents, including the instability, membrane impermeability, poor synthetic yield and resulting diastereomeric mixtures. To circumvent these main liabilities, novel chemoenzymatic strategies that employ methionine adenosyltransferases (MATs) and methionine (Met) analogs to synthesize AdoMet analogs in vitro were advanced. Unstable AdoMet analogs are simultaneously utilized in a one-pot reaction by MTs for the alkylrandomization of NP scaffolds. As cell membranes are permeable to Met analogs, this also sets the stage for cell-based and, potentially, in vivo applications. In order to further address the instability of AdoMet and analogs thereof, MAT-catalyzed reactions utilizing Met and ATP isosteres generated highly stable AdoMet isosteres that were capable of downstream utilization by MTs. Finally, the development, use, and results of a high-throughput screen identified mutant-MAT/Met-analog pairs suitable for postliminary bioorthogonal applications.

In this thesis we have tackled a few scheduling problems under energy constraint, since the energy issue is becoming crucial, for both economical and environmental reasons. In the first chapter, we exhibit tight bounds on the energy metric of a classical algorithm that minimizes the makespan of independent tasks. In the second chapter, we schedule several independent but concurrent pipelined applications and address problems combining multiple criteria, which are period, latency and energy. We perform an exhaustive complexity study and describe the performance of new heuristics. In the third chapter, we study the replica placement problem in a tree network. We try to minimize the energy consumption in a dynamic frame. After a complexity study, we confirm the quality of our heuristics through a complete set of simulations. In the fourth chapter, we come back to streaming applications, but in the form of series-parallel graphs, and try to map them onto a chip multiprocessor. The design of a polynomial algorithm on a simple problem allows us to derive heuristics on the most general problem, whose NP-completeness has been proven. In the fifth chapter, we study energy bounds of different routing policies in chip multiprocessors, compared to the classical XY routing, and develop new routing heuristics. In the last chapter, we compare the performance of different algorithms of the literature that tackle the problem of mapping DAG applications to minimize the energy consumption.

The inquiry documented in this thesis is located at the nexus of technological innovation and traditional schooling. As we enter the second decade of a new century, few would argue against the increasingly urgent need to integrate digital literacies with traditional academic knowledge. Yet, despite substantial investments from governments and businesses, the adoption and diffusion of contemporary digital tools in formal schooling remain sluggish. To date, research on technology adoption in schools tends to take a deficit perspective of schools and teachers, with the lack of resources and teacher ‘technophobia’ most commonly cited as barriers to digital uptake. Corresponding interventions that focus on increasing funding and upskilling teachers, however, have made little difference to adoption trends in the last decade. Empirical evidence that explicates the cultural and pedagogical complexities of innovation diffusion within long-established conventions of mainstream schooling, particularly from the standpoint of students, is wanting. To address this knowledge gap, this thesis inquires into how students evaluate and account for the constraints and affordances of contemporary digital tools when they engage with them as part of their conventional schooling. It documents the attempted integration of a student-led Web 2.0 learning initiative, known as the Student Media Centre (SMC), into the schooling practices of a long-established, high-performing independent senior boys’ school in urban Australia. The study employed an ‘explanatory’ two-phase research design (Creswell, 2003) that combined complementary quantitative and qualitative methods to achieve both breadth of measurement and richness of characterisation. In the initial quantitative phase, a self-reported questionnaire was administered to the senior school student population to determine adoption trends and predictors of SMC usage (N=481). Measurement constructs included individual learning dispositions (learning and performance goals, cognitive playfulness and personal innovativeness), as well as social and technological variables (peer support, perceived usefulness and ease of use). Incremental predictive models of SMC usage were conducted using Classification and Regression Tree (CART) modelling: (i) individual-level predictors, (ii) individual and social predictors, and (iii) individual, social and technological predictors. Peer support emerged as the best predictor of SMC usage. Other salient predictors include perceived ease of use and usefulness, cognitive playfulness and learning goals. On the whole, an overwhelming proportion of students reported low usage levels, low perceived usefulness and a lack of peer support for engaging with the digital learning initiative. The small minority of frequent users reported having high levels of peer support and robust learning goal orientations, rather than being predominantly driven by performance goals. These findings indicate that tensions around social validation, digital learning and academic performance pressures influence students’ engagement with the Web 2.0 learning initiative. The qualitative phase that followed provided insights into these tensions by shifting the analytics from individual attitudes and behaviours to shared social and cultural reasoning practices that explain students’ engagement with the innovation. Six indepth focus groups, comprising 60 students with different levels of SMC usage, were conducted, audio-recorded and transcribed. Textual data were analysed using Membership Categorisation Analysis. Students’ accounts converged around a key proposition. The Web 2.0 learning initiative was useful-in-principle but useless-in-practice. While students endorsed the usefulness of the SMC for enhancing multimodal engagement, extending peer-topeer networks and acquiring real-world skills, they also called attention to a number of constraints that obfuscated the realisation of these design affordances in practice. These constraints were cast in terms of three binary formulations of social and cultural imperatives at play within the school: (i) ‘cool/uncool’, (ii) ‘dominant staff/compliant student’, and (iii) ‘digital learning/academic performance’. The first formulation foregrounds the social stigma of the SMC among peers and its resultant lack of positive network benefits. The second relates to students’ perception of the school culture as authoritarian and punitive with adverse effects on the very student agency required to drive the innovation. The third points to academic performance pressures in a crowded curriculum with tight timelines. Taken together, findings from both phases of the study provide the following key insights. First, students endorsed the learning affordances of contemporary digital tools such as the SMC for enhancing their current schooling practices. For the majority of students, however, these learning affordances were overshadowed by the performative demands of schooling, both social and academic. The student participants saw engagement with the SMC in-school as distinct from, even oppositional to, the conventional social and academic performance indicators of schooling, namely (i) being ‘cool’ (or at least ‘not uncool’), (ii) sufficiently ‘compliant’, and (iii) achieving good academic grades. Their reasoned response therefore, was simply to resist engagement with the digital learning innovation. Second, a small minority of students seemed dispositionally inclined to negotiate the learning affordances and performance constraints of digital learning and traditional schooling more effectively than others. These students were able to engage more frequently and meaningfully with the SMC in school. Their ability to adapt and traverse seemingly incommensurate social and institutional identities and norms is theorised as cultural agility – a dispositional construct that comprises personal innovativeness, cognitive playfulness and learning goals orientation. The logic then is ‘both and’ rather than ‘either or’ for these individuals with a capacity to accommodate both learning and performance in school, whether in terms of digital engagement and academic excellence, or successful brokerage across multiple social identities and institutional affiliations within the school. In sum, this study takes us beyond the familiar terrain of deficit discourses that tend to blame institutional conservatism, lack of resourcing and teacher resistance for low uptake of digital technologies in schools. It does so by providing an empirical base for the development of a ‘third way’ of theorising technological and pedagogical innovation in schools, one which is more informed by students as critical stakeholders and thus more relevant to the lived culture within the school, and its complex relationship to students’ lives outside of school. It is in this relationship that we find an explanation for how these individuals can, at the one time, be digital kids and analogue students.

Distance education (DE) is now recognised as an education system independent from conventional face-to-face education. It has self-governing theories and pedagogies. It attracts students with unique characteristics different from those of on-campus students. The present distance learning student differs from the past ones by characteristics, needs and contexts. Not all students registering for distance learning conform to the characteristics of distance students described in theory. It is now acknowledged that DE systems demand special skills including time management, self-regulation and independent learning skills. Yet, few of these students enter into distance learning with prior experiences on its demands. The new student is compelled to learn to deal with challenges that come with DE i.e. the impact of ‘distance’, isolation and time management. ‘The net generation’ and ‘digital natives’ are now in college but with skills not automatically transferable to learning technologies. Information and communication technologies (ICT) providers are mostly focused on the ‘use’ rather than the ‘user’. Universities are continuously adopting new technologies leaving the student bewildered as to the focus; learning or technology training. The internet has ‘everything’; open course ware (OCW), open education resources (OERS), wikis and all web information. Students cannot simply find things for themselves. Furthermore distance learning has no policy on how to engage with the internet and students are left to decide what, which and how much is required for any level of study. Most universities in Africa moving from single to dual mode have not integrated distance learning pedagogy which requires restructuring in the organisation, policy and course development. DE, though spanning over two centuries has been mutually dependent on technology. The present technology demands a paradigm shift from that of correspondence days. These issues have created the need for support strategies that can literally accompany the DE student throughout his/her academic journey. Universities have established DE units, campuses and schools for a variety of reasons. It is required that such universities provide learner support systems for their students. The purpose of this study was to assess the learner support services available for distance learning undergraduate students in two universities in Kenya i.e. Northern University (NU) and Western University (WU). A Learner support system can comprise of numerous components. In this study, nine (9) components/indices were tested as the indices for providing support services. These are:- registration procedures, orientation programme and skills training, technology and learning materials, counselling and mentorship, interactions and communication, feedback, regional centres and library, students association and representation and course progression and satisfaction. This study employed an evaluation research design utilising both quantitative and qualitative methods. Online questionnaires were used for quantitative data collection. For qualitative data collection two (2) instruments were used; an interview schedule for key programme implementers and a documentary analysis tool for documents and websites. The findings indicated that the main indices that distinguished the two universities were registration process, technology and learning materials, counselling/mentorship and regional centres where the t-test showed significant differences. The p values were 0.008, 0.012, 0.036 and 0.015 respectively at 0.05 significance level. In all of them, Northern University (NU) had a relatively high mean score than Western University (WU) except for the index on counselling and mentorship. / Educational Foundations / D. Ed. (Socio-Education)

El objetivo que se persigue con esta tesina es mostrar un panorama didáctico efectivo del uso de diversas redes sociales y el correo electrónico para la adquisición del español como lengua extranjera. Se han realizado investigaciones teóricas en diversas fuentes literarias y un estudio empírico que ha arrojado datos interesantes. En este trabajo se exponen diversas aportaciones lingüísticas que dan soporte a nuestras cuatro propuestas didáctias que proponen actividades en las que se pretende la inmersión del alumno en la lengua meta de una manera auténtica y motivadora. A través de este trabajo podemos concluir que el involucrar las redes sociales en las lecciones de ELE con un uso responsable y enfocado, contribuiría a construir un entorno multicultural entre los alumnos que supere las barreras geográficas y culturales del idioma, donde podría fácilmente darse un aprendizaje mucho más efectivo. / The objective pursued with this essay is to show an efficient didactic way of how to use various social networks and e-mail in the acquisition of Spanish as a foreign language. Theoretical investigations have been conducted in various literary sources and an empirical study have been conducted that yielded interesting data. In this essay we describe various linguistic contributions that give support to our four didactic proposals in which we seek the student’s immersion in the target language in anauthentic and motivating way. With this investigation we can conclude that the responsible and focused use of the social networks in the Spanish as a foreign language lessons, contributes to building a multicultural environment among students that overcome the geographic and cultural barriers of language, which could easily make learning more efficient.