Submitted by Adelmo Ferreira de Lima Filho (adelmof.lima@yahoo.com) on 2018-06-25T20:04:28Z No. of bitstreams: 1 MPA_AdelmoLima_Dissertacao_Final.pdf: 3420689 bytes, checksum: 9ebd65e5d2b4e7fadfa1c409a555f83d (MD5) / Approved for entry into archive by Mayara Costa de Sousa (mayara.sousa@fgv.br) on 2018-08-13T16:34:53Z (GMT) No. of bitstreams: 1 MPA_AdelmoLima_Dissertacao_Final.pdf: 3420689 bytes, checksum: 9ebd65e5d2b4e7fadfa1c409a555f83d (MD5) / Approved for entry into archive by Suzane Guimarães (suzane.guimaraes@fgv.br) on 2018-08-13T17:03:01Z (GMT) No. of bitstreams: 1 MPA_AdelmoLima_Dissertacao_Final.pdf: 3420689 bytes, checksum: 9ebd65e5d2b4e7fadfa1c409a555f83d (MD5) / Made available in DSpace on 2018-08-13T17:03:01Z (GMT). No. of bitstreams: 1 MPA_AdelmoLima_Dissertacao_Final.pdf: 3420689 bytes, checksum: 9ebd65e5d2b4e7fadfa1c409a555f83d (MD5) Previous issue date: 2018-05-25 / Este trabalho é um estudo misto com objetivo de capturar a percepção de um grupo selecionado de agentes do mercado de capitais sobre os fatores que influenciam o investimento em Brazilian Depositary Receipt – (BDRs) no mercado brasileiro. Tal questão é relevante porque desde seu lançamento o BDR foi apresentado ao mercado como sendo uma possibilidade de elaboração de novas estratégias de diversificação de investimento, arbitragem, capitação de recursos, dentre outros motivos. Dessa forma, o objetivo deste estudo é apresentar uma visão do BDR no mercado brasileiro e responder a pergunta pesquisa de quais fatores influenciam o investimento em BDRs no mercado de capitais brasileiro. Para atingir este objetivo foi realizada uma pesquisa do tipo survey, com o uso do método misto, combinando dados coletados através de um questionário pré-definido e dados qualitativos através de entrevistas com um grupo selecionado de agentes do mercado de capitais sendo corretoras, gestores de ativos, investidores profissionais, bancos de investimentos, instituições depositárias e escritórios de advocacias especializados em mercado de capitais no Brasil. Os resultados trazem: primeiro, uma visão histórica dos BDRs no Brasil; segundo, apresentam uma análise sobre os fatores que influenciam o uso dos BDRs no mercado de capitais no Brasil; terceiro, contribui para prática de mercado, revelando os aspectos dos BDRs; quarto, apresenta para qual mercado e público alvo esse ativo está atualmente direcionado baseado em uma visão de vantagens e desvantagens do investimento em BDRs. / This work is a mixed study aimed at capturing the perception of a selected group of capital market agents about the factors that influence the Brazilian Depositary Receipt (BDRs) investment in the Brazilian market. This issue is relevant because, since its implementation, the BDR has been presented to the market as a possibility to elaborate new strategies for investment diversification, arbitrage, fundraising, among other reasons. Thus, the objective of this study is to present a view of the BDR in the Brazilian market and to answer the research question of which factors influence the investment in BDRs in the Brazilian capital market. To achieve this objective, a survey was carried out using the mixed method, combining data collected through a pre-defined questionnaire and qualitative data through interviews with a selected group of capital market agents being brokerage firms, assets, professional investors, investment banks, depository institutions and law firms specializing in capital markets in Brazil. The results bring: first, a historical view of the BDRs in Brazil; second, present an analysis on the factors that influence the use of the BDRs in the capital market in Brazil; Third, it contributes to market practice, revealing aspects of BDRs; fourth, presents to which market and target public this asset is currently directed based on a vision of the advantages and disadvantages of investing in BDRs.

Présentation du système POLYPHEME-MOGADOR : un modèle pour la conception de bases de données reparties. Points de vue utilisateur pour la définition et la manipulation d'une bases de données reparties. Le problème de décomposition. Spécifications de réalisation.

Submitted by Andrea Manduca (andrea.manduca@itau-unibanco.com.br) on 2012-02-23T15:23:24Z No. of bitstreams: 1 tese final - 220212.pdf: 823269 bytes, checksum: 73fbbf7fe4f49cec560d700457cca02a (MD5) / Approved for entry into archive by Gisele Isaura Hannickel (gisele.hannickel@fgv.br) on 2012-02-23T16:50:21Z (GMT) No. of bitstreams: 1 tese final - 220212.pdf: 823269 bytes, checksum: 73fbbf7fe4f49cec560d700457cca02a (MD5) / Made available in DSpace on 2012-02-23T16:52:47Z (GMT). No. of bitstreams: 1 tese final - 220212.pdf: 823269 bytes, checksum: 73fbbf7fe4f49cec560d700457cca02a (MD5) Previous issue date: 2012-01-31 / The main purpose of this study is to determine the impact of questionable governance practices on Agrenco´s management, listed under BDR program, over the returns of other companies with the same structure. Previous papers were about to determine the factors that influence firms in their decision to list their stocks in different stock exchanges. This one is related to the impact on the returns of a bankruptcy event on a company listed under BDR structure over other companies with the same characteristics. Understand the consequences of Agrenco´s event is mandatory to financial markets players. Two methods of analysis were applied in this study. The fist approach was referred to a simple graphical observation of asset prices listed under BDR programs. The second, used econometric models to understand if Agrenco´s event resulted in negative returns to companies listed under BDRs structures. A time series model was applied (AR approach of auto-regression) by using structural break dummy variable. Both of them were intended to verify that from the date of the bankruptcy of Agrenco, the companies listed in the form of BDRs were negatively affected by their prices as a result of such event. The results, based on the charts, not indicated a detachment of the most of share´s return from the Ibovespa index one week after the announcement of the financial problems of Agrenco. The second, based on econometric tests, indicated that there was Agrenco´s impact on the returns of stocks listed in the form of BDR. The major contribution of this study was to verify that the event of bankruptcy on Agrenco contaminated the return of other companies listed under the same vehicle as a source of funding. / Este trabalho tem por objetivo verificar o impacto que más práticas na gestão da Agrenco, empresa listada na bolsa de valores brasileira sob a forma de BDRs (Brazilian Depositary Receipts), trouxe para a precificação dos demais ativos listados sob a mesma estrutura. Estudos anteriores, como os de Saudagaran (1988) e Pagano (2001), focaram em temas referentes aos motivos que influenciaram as companhias a listarem suas ações em diferentes bolsas. Entender as conseqüências do evento Agrenco é importante para todos os participantes do mercado financeiro. O estudo contemplou uma amostra das principais empresas listadas sobre a forma de BDRs desde a data de seus IPOs até 26/08/2008. Primeiramente efetuou-se uma análise do comportamento gráfico dos preços dos ativos das BDRs listadas. Posteriormente elaborou-se três regressões múltiplas utilizando-se um modelo de série temporal (modelo AR – auto-regressivo), com análise de quebra estrutural e uso de variável Dummy. A primeira regressão relaciona a variável Agrenco com índices de BDRs constituídos especificamente para este estudo, a segunda inclui uma variável Dummy de intercepto e a terceira combina a variável Dummy de intercepto com uma variável Dummy de inclinação. As regressões têm o objetivo de se averiguar se o evento da Agrenco afetou sistematicamente os preços das ações listadas sob a mesma forma. A maior contribuição do estudo foi verificar que a má prática de gestão na Agrenco, listada sob a forma de BDR, contaminou o retorno de outras empresas que se utilizaram do mesmo veículo como fonte de captação de recursos. Os resultados apontaram, pela análise gráfica, que não houve um descolamento da valorização da maior parte das ações uma semana depois do anúncio dos problemas financeiros da Agrenco em relação a carteira téorica de mercado (IBOVESPA). Entretanto, os resultados dos testes econométricos apontaram que houve impacto do evento Agrenco sobre os retornos das ações listadas sob a forma de BDR.

Les réseaux véhiculaires, connus sous le terme VANETs, sont des réseaux impliquant des communications entre deux ou plusieurs véhicules et éventuellement une communication avec des éléments d’infrastructure sur la route. Récemment, le concept de systèmes de transport intelligents (STI) a connu beaucoup d’intérêt. Les STI sont des systèmes utilisant les nouvelles technologies de communication sans fil appliquées au domaine du transport pour améliorer la sécurité routière, la logistique et les services d’information. Des défis majeurs ont besoin cependant d'être abordés pour offrir une communication sur la route sécurisée et fiable dans des environnements anonymes et quelquefois hostiles à la communication. Comme dans tout système de communication, les réseaux véhiculaires doivent opérer en respectant des contraintes en termes de qualité de service. Ces contraintes sont d’autant plus strictes quand il s’agit de fournir des services de sécurité sur la route. Ce projet vise à développer des techniques de communication véhiculaires pour le transfert des informations de manière fiable entre véhicules roulant à grande vitesse tout en contrôlant la surcharge du réseau. Ces techniques visent la prise en compte des contraintes temporelles sur les délais de transfert afin d’envisager leur utilisation dans des applications critiques telle que la sécurité sur la route. Pour ce faire, cette thèse propose d’abord un protocole optimal de dissémination de messages d’urgence pour les VANETs. Il est basé sur une stratégie de diffusion qui exploite les véhicules sur la direction opposée afin d’accélérer la dissémination du message d’urgence tout en réduisant le nombre de transmissions. Ainsi, et dans le but d’assurer une dissémination fiable et à faible surcoût, une technique de retransmission périodique intelligente permettant l’adaptation du protocol proposé à différentes densités du trafic routier est proposée. Dans un second volet, ce projet propose une approche hybride de dissémination de messages d’urgence qui combine alternativement les avantages des deux principales approches de dissémination existantes (Sender-oriented et Receiver-oriented dont notre première proposition fait partie) afin de garantir une transmission fiable des alertes tout en réduisant les délais. Les approches Receiver-Oriented qui sont les plus adaptées pour les applications de sécurité dans les VANETs peuvent minimiser la latence et les limitations des approches Sender-Oriented. Mais, ilsdoivent aussi mieux exploiter les apports des messages hello (beacons) échangés dans la technologie IEEE802.11P. Ainsi, et dans le but de surmonter les limites des approches de retransmissions périodiques et celles de relais- multiples afin d’assurer des échanges fiables de messages de sécurité tout en réduisant la surcharge de la bande passante, nous introduisons un nouveau mécanisme DR/BDR (Designated Relay/Backup Designated Relay). Le BDR, dans ce mécanisme, doit remplacer le DR et assurer sa tâche quand il détecte, à travers les beacons colorés échangés,l’échec de ce dernier dans la dissémination du message d’urgence. / Vehicular Ad hoc NETworks (VANETs) have gained considerable attention in the past few years due to their promising applications such as safety warning, transport efficiency or mobile infotainment. Avoiding accidents and traffic jams are two main immediate benefits of vehicular networks. For instance, most drivers would like to receive real-time alerts about accidents happening at a short distance in front of their vehicles since these accidents could lead to collision chains involving tens of vehicles. Also, the ability to receive an alert about a potential traffic jam would allow drivers to take alternate routes, saving both time and fuel. In both cases, warning messages should be broadcasted to all vehicles traveling over a geographical area, and need to be delivered with high reliability, low delay and low overhead. It is therefore important to develop a reliable and efficient safety information dissemination protocol in vehicular networks. Due to the vehicle mobility and lossy wireless channel, highly reliable, scalable and fast multi-hop broadcast protocol is very challenging to design. A number of solutions have been proposed in the past few years. However, the tradeoff between reliability and efficiency in such solutions needs to be carefully considered. This thesis presents an optimal protocol for the broadcast of safety messages in VANETs. Optimality, in terms of delay and transmission count, is achieved using a broadcast strategy that exploits opposite vehicles. To carry out reliable and efficient broadcast coordination, intelligent periodic rebroadcasts, which effectively adapt our protocol to sparse and dense networks, are proposed. Simulations are conducted and results are presented to show that it has a better performance over existing competing protocols. As a second contribution, we propose an alternative Receiver-Sender approach that combines advantages of the two existing dissemination approaches (Sender-oriented and Receiver-oriented to which our first proposal belongs) to ensure low latency and high reliability. The proposal can use any sender or receiver oriented protocol but the same selected one is used during all the dissemination process. In order to overcome the unreliability and broadcast overhead generated by periodic rebroadcasts and multiple relays schemes, we introduce a DR/BDR (Designated Relay/Backup Designated Relay) mechanism where the BDR has to replace the DR when detecting,from exchanged colored beacons, its failure in informing concerned vehicles.

[pt] Uma das estratégias mais populares para publicar dados estruturados na Web é expor bases de dados relacionais (BDR) em formato RDF. Esse processo é chamado BDR-para-RDF ou triplificação. Além disto, princípios de Linked Data oferecem vários guias para dar suporte a este processo. Existem duas principais abordagens para mapear bases de dados relacionais para RDF: (1) a abordagem de mapeamento direto, onde o esquema das bases de dados é diretamente mapeado para um esquema RDF, e (2) a abordagem de mapeamento customizado, onde o esquema RDF pode ser significativamente diferente do esquema original da base de dados relacional. Em ambas abordagens, existem vários desafios relacionados tanto com a publicação quanto com o uso de dados em RDF originados de bases de dados relacionais. Esta tese propõe a coleta de design rationale como uma valiosa fonte de informação para minimizar os desafios do processo de triplificação. Essencialmente, a coleta de design rationale melhora a consciência sobre as ações feitas no mapeamento da base de dados relacional para um conjunto de dados no formato RDF. As principais contribuições da tese são: (1) um modelo de design rationale (DR) adequado para o processo de BDR-para- RDF, independente da abordagem utilizada (direta ou customizada); (2) a integração de um modelo de DR para um processo que segue a abordagem direta de BDR-para-RDF e para um processo que segue a abordagem customizada usando a linguagem R2RML; (3) o uso do DR coletado para melhorar recomendações de reuso de vocabulários existentes através de algoritmos de Ontology Matching. / [en] One of the most popular strategies to publish structured data on the Web is to expose relational databases (RDB) in the RDF format. This process is called in RDB-to-RDF or triplification. Furthermore, the Linked Data principles offer useful guidelines for this process. Broadly stated, there are two main approaches to map relational databases into RDF: (1) the direct mapping approach, where the database schema is directly mapped to an RDF schema; and (2) the customized mapping approach, where the RDF schema may significantly differ from the original database schema. In both approaches, there are challenges related to the publication and to the consumption of the published data. This thesis proposes the capture of design rationale as a valuable source of information to minimize the challenges in RDB-to-RDF processes. Essentially, the capture of design rationale increases the awareness about the actions taken over the relational database to map it as an RDF dataset. The main contributions of this thesis are: (1) a design rationale (DR) model adequate to RDB-to-RDF processes, independently of the approach (direct or customized) followed; (2) the integration of a DR model in an RDB-to-RDF direct mapping process and in an RDB-to-RDF customized mapping process using the R2RML language; (3) the use of the DR captured to improve the recommendations for vocabularies to reuse.