Cette thèse analyse comment le logiciel open source, par son existence et ses caractéristiques, affecte les comportements des firmes propriétaires sur le marchés des logiciels et étudie dans quelles conditions les politiques publiques de soutien des logiciels open source sont-elles profitables pour le bien-être social. Elle comporte trois essais théoriques, portant chacun sur un aspect spécifique de cette problématique. Le premier essai étudie les incitations des firmes à coopérer avec la communauté open source en fonction de leur niveau d'asymétrie et examine comment les décisions de l'open source affectent les incitations à innover et le bien-être social. Dans le deuxième essai, on montre comment le comportement stratégique d'une firme propriétaire est affecté par la présence d'une communauté open source sous les conditions d'hétérogénéité des usagers et des programmeurs et en présence du forking. On montre également sous quelles conditions l'intervention publique en faveur de la communauté open source affecte positivement le bien être social. Enfin, le troisième essai examine l'impact sur le surplus des usagers et du bien-être social de la subvention publique au logiciel open source lorsque les usagers sur le marché sont hétérogènes par leur niveau d'expertise. / This thesis analyzes how open source software, by its existence and its characteristics, affects the behaviour of firms in the proprietary software market and examines the conditions under which public policies supporting open source software they are beneficial to social welfare. It contains three theoretical essays, each covering a specific aspect of this problem. The first essay explores the incentives of firms to cooperate with the open source community based on their level of asymmetry and examines how the decisions of open source affect incentives to innovate and social welfare. In the second essay, we show how the strategic behaviour of a firm is affected by the presence of an open source community under conditions of heterogeneity of users and programmers and in the presence of forking. We also show under what conditions government intervention in favour of the open source community is beneficial to social welfare. Lastly, the third essay examines the impact on the surplus of the users and the social welfare of the public subsidies to the open source software when the users on the market are heterogeneous by their level of expertise.

Philosophiae Doctor - PhD / Evaluating software is a universal and complex problem. The question is: how should software be selected and adopted, or rather, which of the software packages is the most suitable for a specific environment? Extensive research on the evaluation of software has been done, but only a few researchers have considered evaluation of e-learning systems based on three software quality characteristics (i.e. usability, maintainability and deployability) for implementation in third world countries. In this thesis, it will be considered how to use a mixed research methods for the evaluation of free and open source e-learning systems in a developing country. The scope of this investigation is the evaluation of two free and open source e-learning systems at the Open University of Tanzania using 33 stakeholders (some with more and others with less computer expertise). / South Africa

There has been a significant rise in the provision of television and video services over IP (IPTV) in recent years. Increasing network capacity and falling bandwidth costs have made it both technically and economically feasible for service providers to deliver IPTV services. Several telecommunications (telco) operators worldwide are rolling out IPTV solutions and view IPTV as a major service differentiator and alternative revenue source. The main challenge that IPTV providers currently face, however, is the increasingly congested television service provider market, which also includes Internet Television. IPTV solutions therefore need strong service differentiators to succeed. IPTV solutions can doubtlessly sell much faster if they are more affordable or low-cost. Advertising has already been used in many service sectors to help lower service costs, including traditional broadcast television. This thesis therefore explores the role that advertising can play in helping to lower the cost of IPTV services and to incentivise IPTV billing. Another approach that IPTV providers can use to help sell their product is by addressing the growing need for control by today's multimedia users. This thesis will therefore explore the varied approaches that can be used to achieve viewer focused IPTV implementations. To further lower the cost of IPTV services, telcos can also turn to low-cost, open source platforms for service delivery. The adoption of low-cost infrastructure by telcos can lead to reduced Capital Expenditure (CAPEX), which in turn can lead to lower service fees, and ultimately to higher subscriptions and revenue. Therefore, in this thesis, the author proposes a CustOmisable, INcentive (COIN) driven Video on Demand (VoD) framework to be developed and deployed using the Mobicents Communication Platform, an open source service creation and execution platform. The COIN framework aims to provide a viewer focused, economically competitive service that combines the potential cost savings of using free and open source software (FOSS), with an innovative, incentive-driven billing approach. This project will also aim to evaluate whether the Mobicents Platform is a suitable service creation and execution platform for the proposed framework. Additionally, the proposed implementation aims to be interoperable with other IPTV implementations, hence shall follow current IPTV standardisation architectures and trends. The service testbed and its implementation are described in detail and only free and open source software is used; this is to enable its easy duplication and extension for future research. / TeX output 2012.03.02:1241 / Adobe Acrobat 9.2 Paper Capture Plug-in

In the last decade, there has been an increase in the number of web-enabled mobile devices, offering a new platform that can be targeted for the development of learning applications. Worldwide, developers have taken initiatives in developing mobile learning (M-learning) systems to provide students with access to learning materials regardless of time and location. The purpose of this study was to investigate whether it is viable for first year students enrolled at the University of Namibia (UNAM) to use mobile phones for ad-hoc learning of mathematical concepts. A system, EnjoyMath, aiming to assist students in preparing for tests, examinations, review contents and reinforce knowledge acquired during traditional classroom interactions was designed and implemented. The EnjoyMath system was designed and implemented through the use of the Human Centred Design (HCD) methodology. Two revolutions of the four-step process of the HCD cycle were completed in this study. Due to the distance between UNAM and Rhodes University (where the researcher was based), the researcher could not always work in close relation with the UNAM students. Students from the Extended Study Unit (ESU) at Rhodes University were therefore selected in the first iteration of the project due to their proximity to the researcher and their similar demographics to the first year UNAM students, while the UNAM students were targeted in the second iteration of the study. This thesis presents the outcome of the two pre-intervention studies of the first-year students' perceptions about M-learning conducted at Rhodes University and UNAM. The results of the pre-intervention studies showed that the students are enthusiastic about using an M-learning system, because it would allow them to put in more time to practice their skills whenever and wherever they are. Moreover, the thesis presents the different stages undertaken to develop the EnjoyMath system using Open Source Software (PHP and MySQL). The results of a user study (post-intervention) conducted with participants at UNAM, ascertained the participants' perception of the usability of the EnjoyMath system and are also presented in this thesis. The EnjoyMath system was perceived by the participants to be "passable"; hence an M-learning system could be used to compliment an E-learning system at UNAM.

This theses analyses necessity and legitimacy of existence of intellectual property rights, especially patents and copyrights. There is shown the true essence of these instruments as monopoly privilege. On case of information technology I demonstrate that these privileges are unreasonable and counterproductive in many cases. Analysis of ?free software? alternative model proves that use of patents and copyrights is not a necessary condition of creation of intangible goods. The last part of this work shows, that existence of any special instruments for intangible goods protection is not needed as well as it is not reasonable.

The theme of this thesis is to analyze current technological trends with a focus on open source software in terms of relevance and importance for enterprises. The main objective is to evaluate the current status of open source software for Czech enterprises and characterize the progress based on data from 2010 and 2015. The thesis describes the basic forms of software used by companies which are further categorized based on the functionality and usability. The specifics of open source software and its licenses are defined. Subsequently the selection of specific open source licenses, generally perceived views on their use and the status of open source software in various stages of its existence are described. Analytical part describes the results of the author's survey in Czech enterprises in terms of open source software application for 2015. The results are compared with data from 2010 and appropriate conclusions are defined. Finally, the hypotheses are connected with the results of the author's survey, data comparison, available open source methodologies and other sources for an overall assessment of the situation in the Czech Republic.

Orientadores: Diógenes Cortijo Costa, Emília Wanda Rutkowski / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo / Made available in DSpace on 2018-08-27T22:03:10Z (GMT). No. of bitstreams: 1 Hosokawa_ElianaKimoto_M.pdf: 13880772 bytes, checksum: 897c0a00b54b6e7934a96e421cf042ab (MD5) Previous issue date: 2015 / Resumo: O mapeamento sistemático brasileiro, cujas cartas em escalas pequenas, 1:1.000.000 a 1:25.000, além de incompletas e desatualizadas, tem apenas 1% das cartas 1:25.000 concluídas. Os demais mapeamentos nacionais são descontínuos, os dados geoespaciais são desatualizados, as informações geográficas escassas e não estão centralizadas em uma única base de dados. Essa dispersão resulta na repetição de produtos cartográficos e desperdício de investimento público. Na tentativa de minimizar esses problemas, foi aprovado o decreto nº 6.666/2008, instituindo a Infraestrutura Nacional de Dados Espaciais e o Diretório Brasileiro de Dados Geoespaciais, DBDG, uma rede de servidores integrados pela Internet que reúne dados geoespaciais de diferentes instituições desenvolvedoras de produtos cartográficos. Contudo, um crescente número de instituições têm disponibilizado gratuitamente seus diretórios de dados e não constam no DBDG. Um Sistema de Informação Geográfica, SIG, destaca-se por manipular dados de diferentes fontes, utilizando o espaço geográfico como fator comum. Este sistema possibilita o estudo de fenômenos ambientais e urbanos para a gestão territorial municipal. No entanto, poucos municípios utilizam o SIG, em virtude da falta de recursos financeiros, porém, com o avanço de softwares livres e financiamentos do governo sua utilização torna-se acessível. A Associação Brasileira de Normas Técnicas estabelece o conteúdo da Base Cartográfica Municipal na NBR 14.166, definindo como os aspectos do território municipal devem ser representados. Nesta perspectiva, esta pesquisa analisou as potencialidades e as limitações das geotecnologias livres como ferramenta de apoio ao planejamento territorial municipal. Para tal, foram identificados os diretórios que disponibilizam gratuitamente os dados geoespaciais do Brasil e desenvolvido um banco de dados georreferenciados, para apresentar os dados referentes aos elementos básicos de uma Base Cartográfica Municipal / Abstract: The Brazilian systematic mapping, whose maps in small scale, 1:1,000,000 to 1:25,000, further incomplete or outdated, have only 1% of the maps 1:25,000 is completed. The other national mappings are discontinuous, outdated geospatial data, shortage of geographic information and are not centralized in a single database. This dispersion results in repetition cartographic products and public investment waste. In an attempt to minimize these problems, was issued the act nº 6,666/2008, establishing the National Spatial Data Infrastructure and the Brazilian Directory of Geospatial Data, DBDG, a network of integrated servers over the Internet that consolidate geospatial data from different developers institutions of cartographic data products. However, an increasing number of institutions have made available free your data directories and not included in DBDG. A Geographic Information System, GIS, stands out for handling data from different sources, using the geographical space as a common factor. This system allows the study of environmental and urban phenomena to municipal territorial management. However, few municipalities work with the GIS, due to the lack of financial resources, but with the advancement of free software and its use government funding the using will become accessible. The Brazilian Association of Technical Standards establishes the content of Municipal Cartography Basemap at NBR 14,166, determining how the aspects of the municipality shall be represented. In this perspective, this research analyzed the potential and limitations of free geo technology as a support tool to municipal territorial planning. To this end, the directories have been identified that provide free geospatial data from Brazil and developed a geo referenced database, to present data regarding the basic elements of a Municipal Cartography Base / Mestrado / Arquitetura, Tecnologia e Cidade / Mestra em Arquitetura, Tecnologia e Cidade

Nesta tese de doutorado, apresentamos uma abordagem para a observação das métricas de código-fonte, estudando-as através de suas distribuições e associações, além de discutir as relações de causalidade e implicações práticas-gerenciais para monitoramento das mesmas. Em nossos estudos avaliamos a distribuição e correlações dos valores das métricas de 38 projetos de software livre, dentre os com mais contribuidores ativos em seus repositórios. Para tal, coletamos e analisamos os valores para cada métrica em mais de 344.872 classes e módulos dos projetos avaliados. Complementarmente, para mostrarmos a utilidade do monitoramento de métricas, descrevemos uma extensão e adaptação do modelo de causalidade do conceito de atratividade de projetos de software livre, que indica uma relação estatística entre os valores das métricas de código-fonte e a quantidade de downloads, contribuidores e atualizações (commits) nos repositórios dos projetos. Para isso, realizamos estudos empíricos com milhares de projetos de software livre. Do ponto de vista prático, também contribuímos com um conjunto de ferramentas inovador para a automação da avaliação de projetos de software livre, com ênfase nos estudos e na seleção de métricas, o que permite a análise de código-fonte de acordo com a percepção de qualidade das comunidades de software livre. Entre as principais contribuições desta tese está uma análise detalhada, em relação ao comportamento, valores e estudos de caso, de 15 métricas de código-fonte, o que representa um avanço em comparação a literatura relacionada ao ampliar o número de métricas avaliadas e propor uma abordagem que visa diminuir as contradições das análises das métricas. / In this Ph.D dissertation we present an approach about source code metrics tracking. We have researched source code metrics distributions and associations to discuss their causality and management-practices implications. Our studies have assessed distributions and correlations of source code metric values on 38 free software projects, which have a lot of activated contributors in their repositories. We have collected and analyzed metrics from 344,872 classes and modules of about 38 free software projects. Additionally, to show how it is useful to track source code metrics, we have extended the model of free software attractiveness to include source code metrics. Our technical attractiveness model indicates a statistical relationship between source code metrics and number of downloads, contributors, and commits in the analyzed free software repositories. For that, we have conducted empirical studies with 8,450 free software projects. From a practical point of view, we have contributed with a set of innovative tools for automated evaluation of free software projects. Our tool allow the analyses of source code metrics that mirror quality perceptions from the free software communities point of view.

This master thesis is focused on issue transimission system of Czech republic after 2040. Thesis is divided in two parts, teoretical and practical. Teoretical part contains present trends of transmission sytem and the most probably changes in the future decade. Practical part contains simulation of Czech transmission system and various scenarios with idea of open source.

abstract: This dissertation introduces FARCOM (Fortran Adaptive Refiner for Cartesian Orthogonal Meshes), a new general library for adaptive mesh refinement (AMR) based on an unstructured hexahedral mesh framework. As a result of the underlying unstructured formulation, the refinement and coarsening operators of the library operate on a single-cell basis and perform in-situ replacement of old mesh elements. This approach allows for h-refinement without the memory and computational expense of calculating masked coarse grid cells, as is done in traditional patch-based AMR approaches, and enables unstructured flow solvers to have access to the automated domain generation capabilities usually only found in tree AMR formulations. The library is written to let the user determine where to refine and coarsen through custom refinement selector functions for static mesh generation and dynamic mesh refinement, and can handle smooth fields (such as level sets) or localized markers (e.g. density gradients). The library was parallelized with the use of the Zoltan graph-partitioning library, which provides interfaces to both a graph partitioner (PT-Scotch) and a partitioner based on Hilbert space-filling curves. The partitioned adjacency graph, mesh data, and solution variable data is then packed and distributed across all MPI ranks in the simulation, which then regenerate the mesh, generate domain decomposition ghost cells, and create communication caches. Scalability runs were performed using a Leveque wave propagation scheme for solving the Euler equations. The results of simulations on up to 1536 cores indicate that the parallel performance is highly dependent on the graph partitioner being used, and differences between the partitioners were analyzed. FARCOM is found to have better performance if each MPI rank has more than 60,000 cells. / Dissertation/Thesis / Doctoral Dissertation Aerospace Engineering 2019