• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 26
  • 22
  • 8
  • 4
  • 2
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 69
  • 13
  • 11
  • 10
  • 9
  • 9
  • 8
  • 8
  • 7
  • 7
  • 6
  • 6
  • 6
  • 6
  • 6
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Modelación de parámetros físicos de la ecuación de advección-dispersión utilizando un tanque de experimentación de escala intermedia

Sanchez Fuster, Israel 03 February 2012 (has links)
El proceso de dispersión de solutos en el seno de un medio poroso heterogéneo ha sido el objetivo de numerosas investigaciones en las últimas décadas debido tanto a las limitaciones de las ecuaciones matemáticas que lo describen como a la necesidad de describir y predecir el movimiento de contaminantes en acuíferos reales, con la complejidad derivada de los patrones espaciales de heterogeneidad reales y otras incertidumbres en el conocimiento del medio. Las técnicas de modelación actuales se centran generalmente en un único parámetro para explicar la desviación del comportamiento de un penacho de soluto frente a los resultados predichos por la ADE: la variabilidad de la conductividad hidráulica. En ningún caso se hace referencia o se tiene en cuenta la variabilidad espacial de la dispersividad. La dificultad para medir o estimar este parámetro y su enorme dependencia de la escala de la discretización numérica han limitado esta vía de investigación. Esta tesis presenta el primer intento de modelar la variabilidad local de la dispersividad basándose en un experimento de flujo y transporte de solutos en un tanque de experimentación de escala intermedia (Intermediate Scale Experiment, ISE). En esta investigación, se ha construido un medio poroso artificial inserto en un tanque de experimentación cuasi-2D, cuyos patrones de heterogeneidad estaban basados en datos de conductividad hidráulica procedente de una formación natural altamente heterogénea de características no gaussianas Controlando el potencial hidráulico a la entrada y la salida del tanque, se crearon condiciones de flujo estacionario en las que se llevaron a cabo varios ensayos de transporte de trazadores conservativos. Este tanque, construido en metacrilato, fue monitorizado con una red de transductores de presión de alta precisión y se tomaron fotografías digitales de la evolución del penacho de trazador coloreado. / Sanchez Fuster, I. (2011). Modelación de parámetros físicos de la ecuación de advección-dispersión utilizando un tanque de experimentación de escala intermedia [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/14635 / Palancia
42

Implementace OFDM demodulátoru v obvodu FPGA / OFDM demodulator implementation in FPGA

Solar, Pavel January 2010 (has links)
The master's thesis briefly analyses the principle of OFDM modulation, possibilities of the synchronization and channel estimation in OFDM. The simply model of OFDM system is made in MATLAB. Because of the implementation in FPGA is generated the behavioral description of the OFDM demodulator through the combination of the schematics description and the description in the VHDL language. The ISE development environment is used.
43

Insights on corporate sustainability and share value: an event study for Brazilian market

Dick, Carol Inoue 18 December 2013 (has links)
Submitted by Carol Inoue Dick (carol.idick@gmail.com) on 2014-01-14T12:32:28Z No. of bitstreams: 1 Dissertacao EPGE - Carol Inoue Dick.pdf: 816657 bytes, checksum: b14b922889fd19290bb1bec893c606a4 (MD5) / Approved for entry into archive by Vitor Souza (vitor.souza@fgv.br) on 2014-02-03T13:04:12Z (GMT) No. of bitstreams: 1 Dissertacao EPGE - Carol Inoue Dick.pdf: 816657 bytes, checksum: b14b922889fd19290bb1bec893c606a4 (MD5) / Made available in DSpace on 2014-02-07T13:16:41Z (GMT). No. of bitstreams: 1 Dissertacao EPGE - Carol Inoue Dick.pdf: 816657 bytes, checksum: b14b922889fd19290bb1bec893c606a4 (MD5) Previous issue date: 2013-12-18 / Em meio ao crescente volume de publicações sobre sustentabilidade e finanças, diversas pesquisas internacionais e brasileiras têm abordado a relação entre empresas classificadas como sustentáveis e o retorno de suas ações. Nesta mesma linha, este trabalho utilizou o método de estudos de eventos para verificar se entre 2005 e 2013 houve retornos anormais quando as empresas entraram e saíram do Índice de Sustentabilidade Empresarial (ISE). Além de contemplar um período mais atualizado do que seus precedentes, este estudo difere-se dos demais ao analisar o as observações individualmente e ao buscar estabelecer uma relação dos retornos anormais acumulados com as variáveis governança corporativa, tamanho, rentabilidade e alavancagem. Os resultados mostraram que embora não haja evidências conclusivas quando os casos são tomados individualmente, em conjunto eles indicam que a inclusão e a exclusão do ISE geram retornos anormais significativos, positivos e negativos respectivamente, em linha com a teoria dos stakeholders. Quanto às variáveis de controle, nenhuma apresentou relação com os retornos anormais acumulados. / Among the growing volume of publications about sustainability and finance, several international and Brazilian studies regarding the relationship between companies classified as sustainable and the return of their shares have been published. Following this course, this study applied the event study method to verify if between 2005 and 2013 there were abnormal returns when firms entered or exited the Corporate Sustainability Index (ISE). Besides accounting for a longer period than its predecessors, this paper differs from others by analyzing the observations individually and seeking to establish a relationship between abnormal returns and corporate governance, size, profitability and leverage. The results indicate that, although there is no conclusive evidence when cases are considered individually, together they indicate that inclusion and exclusion of ISE generate respectively positive and negative significant abnormal returns, which is in line with stakeholder theory. Regarding the control variables, it was not possible to establish any relationship between them and the cumulative abnormal returns.
44

Convergência de elites : a sustentabilidade no mercado financeiro

Sartore, Marina de Souza 08 October 2010 (has links)
Made available in DSpace on 2016-06-02T19:24:47Z (GMT). No. of bitstreams: 1 3302.pdf: 2414321 bytes, checksum: 36b084be0141c31869c52c6e1583fdbe (MD5) Previous issue date: 2010-10-08 / Financiadora de Estudos e Projetos / The launch of the Brazilian Corporate Sustainability Index in Sao Paulo s Stock Market, analyzed through an economic approach, can be reduced to a new financial tool which measures the profitability of Sustainable listed companies. However, through a sociological approach, the launch of this index is equivalent to the creation of the Brazilian Socially Responsible Investment Market. The creation of this market demonstrates the emergence of new polarizations in the Economic Field, particularly in the Financial Field. These new polarizations indicate a change in the Financial Field, which presents a new way of thinking the Financial Market based on taking account of social, environmental and financial criteria. This change emerges from an elite convergence which challenges the limits of the Financial Field, at the same time trying to reinvent the Financial Market through a proposal of a Sustainable Capitalism. This thesis indicates that it s possible to understand the creation of Socially Responsible Investment Market by studying the actors and institutions that participate in the Corporate Sustainability Index s Committee. As a result, this study emphasizes the urge of developing a Sociology of Indexes. At last, this thesis concludes that the Sustainability insertion in the Financial Field is legitimated by a group acting in the financial area, which converges with the Corporate Social Responsibility s and The Environmental Movement s elite, in an attempt to turn the table of mainstream finance. However, this mainstream turn does not push towards the ending of financial market, but it s strengthening instead. / A criação do Índice de Sustentabilidade Empresarial na Bolsa de Valores do Estado de São Paulo consistiu, pelo viés econômico, em mais um indicador de rentabilidade das empresas sustentáveis listadas na bolsa. Pelo viés sociológico, a criação deste índice equivale à criação do mercado do Investimento Socialmente Responsável no Brasil. A criação deste mercado evidencia o surgimento de novas polarizações no mundo econômico e, em particular, no mundo financeiro. Estas novas polarizações evidenciam portanto uma mudança no habitus financeiro apresentando uma nova forma de pensar o mundo das finanças a partir da tríade economia, meio-ambiente e sociedade. Essa mudança só é possível a partir da convergência de diferentes frações de elites as quais colocam em xeque a autonomia do campo financeiro ao mesmo tempo em que procuram reinventá-lo a partir da proposta de um capitalismo sustentável. Deste modo, esta tese demonstra que é possível compreender a construção do Mercado de Investimento Socialmente Responsável no Brasil a partir do Estudo sociológico dos atores e das instituições que compõem o Conselho do Índice de Sustentabilidade Empresarial apontando a necessidade de se desenvolver no Brasil uma sociologia dos índices. Assim, esta tese conclui que a inserção da Sustentabilidade no mercado financeiro se legitima a partir de um grupo atuante na esfera das finanças, o qual converge com atores ligados à Responsabilidade Social Empresarial e ao Movimento Ambiental, na tentativa de inverter o jogo dominado por financistas mainstream. No entanto, esta tentativa de virar o jogo não pressupõe o fim do mercado financeiro, mas sim o seu fortalecimento e conseqüente reprodução no campo global do poder.
45

Performance sócio-ambiental e os resultados econômicos das empresas : uma análise empírica desta relação

Chitolina, Fabiano Franco 28 August 2012 (has links)
Submitted by Vanessa Nunes (vnunes) on 2015-03-30T19:19:06Z No. of bitstreams: 1 FabianoChitolina.pdf: 1452813 bytes, checksum: 14fdc085bfa149405f3eaf042026ebe1 (MD5) / Made available in DSpace on 2015-03-30T19:19:06Z (GMT). No. of bitstreams: 1 FabianoChitolina.pdf: 1452813 bytes, checksum: 14fdc085bfa149405f3eaf042026ebe1 (MD5) Previous issue date: 2012 / Nenhuma / Não há consenso se e como, programas sócios ambientais criam valor para o acionista. Existem dificuldades em determinar este valor por ele se apresentar no longo prazo, por ser uma medida indireta ou, simplesmente, por não haver métricas de avaliação disponíveis, que respondam claramente essa questão. Diante dessa dificuldade e consequente necessidade acadêmica de avançar nesse tema, esta pesquisa busca verificar se existe relação entre a performance sócio-ambiental e os retornos econômicos. Para isso, busca-se identificar e analisar variáveis qualitativas que possam ser utilizadas como indicadoras do nível de performance sócio-ambiental das empresas, para, então, realizar testes estatísticos com o objetivo de agregar novas informações sobre essa relação no mercado brasileiro. As variáveis dependentes trabalhadas nesta pesquisa foram ROE, ROA, EBITDA, q de Tobin e o Beta 60 meses. Além disso, foi analisado se as vantagens econômicas de uma performance sócio-ambiental superior são mais relevantes para empresas manufatureiras, bem como com maior impacto ambiental. Os resultados do estudo apontam para ganhos econômicos em termos de valorização da empresa (q de Tobin aproximadamente 20% maior) e na redução do risco das empresas (beta 60 meses 9% menor). Ao mesmo tempo, não confirmaram a influência do fato da empresa ser manufatureira ou com diferentes graus de impacto ambiental. / There is no consensus to define if and how these programs create shareholder value. There are difficulties in determining this value in the long run, being an indirect measure or simply because there is no evaluation metrics available to answer this question clearly. Faced with this difficulty and the consequent need for academic progress in this subject, this research seeks to determine whether a relationship exists between the socio-environmental performance on the one hand, and economic performance on the other. To this end, this study seeks to identify and analyze qualitative proxies that can be used as an indicator of the level of socio-environmental performance of companies, then, to perform statistical tests in order to add new information about this relationship in the Brazilian market. The dependent proxies used in this research were ROE, ROA, EBITDA, Tobin's q and the Beta 60 months. In addition, we analyzed whether the economic advantages of a higher socio-environmental performance are more relevant to manufacturing companies, as well as whether they are more relevant to companies with higher environmental impact. The study results point to economic gains in terms of company valuation (Tobin's q approximately 20% higher) and in reducing the risk of companies (beta 60 months 9% lower). At the same they did not confirm any influence based on whether the company is in manufacturing or has different levels of environmental impact
46

Índice de sustentabilidade empresarial (ISE) da BM&FBOVESPA: Motivação para Buscar a Adesão

Gomes, Eendrik Lima 19 April 2017 (has links)
Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2017-06-13T16:47:42Z No. of bitstreams: 1 Eendrik Lima Gomes_.pdf: 447091 bytes, checksum: 668e89a408815405b1c3484fe5b2d6a3 (MD5) / Made available in DSpace on 2017-06-13T16:47:42Z (GMT). No. of bitstreams: 1 Eendrik Lima Gomes_.pdf: 447091 bytes, checksum: 668e89a408815405b1c3484fe5b2d6a3 (MD5) Previous issue date: 2017-04-19 / CFC/CRCs - Conselho Federal de Contabilidade / O presente trabalho objetivou investigar quais fatores são relevantes na decisão da empresa de buscar adesão ao ISE da BM&FBOVESPA. Foram verificados os seguintes fatores para adesão ao ISE: ser reconhecida pelo mercado como empresa que atua com práticas sustentáveis, promovendo a reputação da empresa, a transparência na evidenciação das ações da empresa, o engajamento entre os envolvidos, a vantagem competitiva, e buscando novos conhecimentos, redução de custo de capital a longo prazo, antecipação das regulamentações que podem ser estabelecidas no futuro, aumento no valor da empresa, fortalecimento dos canais de diálogo e comunicação com mídia e indicador para mensurar as ações e práticas sustentáveis. Foram identificados como fatores para não adesão ao ISE: critérios do ISE, estratégia da empresa, falta de estrutura, custos, desconhecimento da carteira do ISE, falta de benefícios e em avaliação para adesão. Metodologicamente, o estudo caracteriza-se como descritivo, realizado por meio de entrevistas e com uma abordagem qualitativa, utilizando o método de análise de conteúdo de Bardin (2011), para tratamento de dados. A coleta de dados teve como base o conjunto de 243 empresas que foram consideradas elegíveis para compor o ISE pelo menos um ano, entre 2009 e 2016. Após, foram selecionadas 74 empresas para composição da amostra. Este conjunto de empresas da amostra, por sua vez, foi subdividido em dois grupos: 1) 22 empresas que tentaram ingressar na carteira do índice, e 2) 52 empresas que não tentaram ingressar no ISE. Concluiu-se que as empresas buscam o ISE, principalmente, para serem reconhecidas pelo mercado e a fim de terem um indicador para mensurar as ações e as práticas sustentáveis. Sendo assim, trata-se de uma ferramenta brasileira importante e reconhecida, que certifica as empresas que possuem um maior comprometimento com a responsabilidade socioambiental. / The present work aimed to investigate which factors are relevant in the decision of the company to seek adhesion to the BM & FBOVESPA ISE. The following factors were verified for adherence to the ISE: to be recognized by the market as a company that acts with sustainable practices promoting the company's reputation, transparency in the disclosure of company actions, engagement among stakeholders, competitive advantage, new knowledge seeking, cost reduction Long-term capital, anticipation of regulations that can be established in the future, increase in the value of the company, strengthening channels of dialogue and communication with the media and an indicator to measure sustainable actions and practices. And the factors for non-adherence to ISE were: ISE criteria, company strategy, lack of structure, costs, lack of knowledge of ISE's portfolio, no benefits and evaluation for membership. The study is characterized as descriptive, conducted through an interview and with a qualitative approach, using the content analysis method of Bardin (2011) for data treatment. The data collection was based on the set of 243 companies that were considered eligible to compose the ISE for at least one year between 2009 and 2016. We selected 74 companies for sample composition. This group of companies in the sample, in turn, was subdivided into two groups: 1) 22 companies that tried to enter the index portfolio, and another; 2) 52 companies that did not try to join the ISE. It was concluded that companies seek ISE mainly to be recognized by the market and as an indicator to measure sustainable actions and practices, being an important and recognized Brazilian tool that certifies companies that have a greater commitment to social and environmental responsibility.
47

Automatic Generation of Hardware for Custom Instructions

Necsulescu, Philip I 12 August 2011 (has links)
The Software/Hardware Implementation and Research Architecture (SHIRA) is a C to hardware toolchain developed by the Computer Architecture Research Group (CARG) of the University of Ottawa. The framework and algorithms to generate the hardware from an Intermediate Representation (IR) of the C code is needed. This dissertation presents the conceiving, design, and development of a module that generates the hardware for custom instructions identified by specialized SHIRA components without the need for any user interaction. The module is programmed in Java and takes a Data Flow Graph (DFG) as an IR for input. It then generates VHDL code that targets the Altera FPGAs. It is possible to use separate components for each operation or to set a maximum number for each component which leads to component reuse and reduces chip area use. The performance improvement of the generated code is compared to using only the processor’s standard instruction set.
48

Automatic Generation of Hardware for Custom Instructions

Necsulescu, Philip I 12 August 2011 (has links)
The Software/Hardware Implementation and Research Architecture (SHIRA) is a C to hardware toolchain developed by the Computer Architecture Research Group (CARG) of the University of Ottawa. The framework and algorithms to generate the hardware from an Intermediate Representation (IR) of the C code is needed. This dissertation presents the conceiving, design, and development of a module that generates the hardware for custom instructions identified by specialized SHIRA components without the need for any user interaction. The module is programmed in Java and takes a Data Flow Graph (DFG) as an IR for input. It then generates VHDL code that targets the Altera FPGAs. It is possible to use separate components for each operation or to set a maximum number for each component which leads to component reuse and reduces chip area use. The performance improvement of the generated code is compared to using only the processor’s standard instruction set.
49

Changed for the Worse: Subjective Change in Implicit and Explicit Self-Esteem in Individuals with Current, Past, and No Posttraumatic Stress Disorder

Roth, Jenny, Steffens, Melanie C., Morina, Nexhmedin, Stangier, Ulrich 13 February 2014 (has links) (PDF)
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
50

Automatic Generation of Hardware for Custom Instructions

Necsulescu, Philip I 12 August 2011 (has links)
The Software/Hardware Implementation and Research Architecture (SHIRA) is a C to hardware toolchain developed by the Computer Architecture Research Group (CARG) of the University of Ottawa. The framework and algorithms to generate the hardware from an Intermediate Representation (IR) of the C code is needed. This dissertation presents the conceiving, design, and development of a module that generates the hardware for custom instructions identified by specialized SHIRA components without the need for any user interaction. The module is programmed in Java and takes a Data Flow Graph (DFG) as an IR for input. It then generates VHDL code that targets the Altera FPGAs. It is possible to use separate components for each operation or to set a maximum number for each component which leads to component reuse and reduces chip area use. The performance improvement of the generated code is compared to using only the processor’s standard instruction set.

Page generated in 0.0428 seconds