972 resultados para Sistemas Gráficos e Multimedia


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Este trabalho compara as soluções disponibilizadas pelos sistemas Derive 5.0, Maple 6 e Mathematica 4.0 para problemas que encontramos no ensino secundário e também nos primeiros anos da universidade. Procuramos destacar os aspectos distintos entre cada um dos programas ao mesmo tempo que fazemos referência aos pontos em que tudo se passa de forma semelhante. Esta dissertação aborda o cálculo numérico, o cálculo simbólico, a programação e os gráficos. Para cada um dos assuntos é estudada a forma como se podem resolver os problemas através dos três sistemas comparando-se estas soluções. Inicialmente, é feita uma abordagem que permite ao utilizador adquirir os conhecimentos básicos acerca dos diversos programas. Tratamos de seguida de algumas questões relacionadas com o cálculo numérico e com algumas funções nomeadamente da Teoria dos Números. Referimos listas e funções e são analisadas diversas formas de manipular listas e os seus elementos bem como algumas áreas da Análise Matemática das quais destacamos as equações, a derivação e a integração compreendendo cálculo numérico e cálculo simbólico. Examinamos um vasto conjunto de operações definidas sobre matrizes (representadas como listas de listas) e polinómios que abrangem as operações mais comuns de cada um dos campos. Analisamos também a programação recursiva, a programação imperativa, a programação funcional e a programação por regras de reescrita. A abordagem aqui adoptada foi a de fornecer ao utilizador as construções chave mais importantes que cada paradigma de programação utiliza bem como as informações básicas acerca do funcionamento de cada uma delas de modo a permitir a resolução dos problemas propostos. Por último os gráficos sobre os quais incidiu a nossa análise foram os de uma e de duas variáveis representados no referencial cartesiano, gráficos estes que são os mais utilizados quer ao nível do ensino superior quer ao nível do ensino secundário. A qualidade e a facilidade de obter rapidamente as representações dão outra dimensão ao estudo dos gráficos principalmente quando estamos a falar de gráficos a três dimensões. A ideia de animação gráfica é também aqui abordada sendo evidente os benefícios da utilização da mesma nos programas em que é possível efectuá-la. Concluímos que na programação o Mathematica destaca-se em relação aos demais o mesmo se passando no Maple no respeitante à representação gráfica. O Derive permite que durante o contacto inicial seja mais fácil trabalhar e aprender a linguagem própria.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

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The use of graphical objects three-dimensional (3D) multimedia applications is gaining more space in the media. Networks with high transmission rates, computers with large processing and graphics boost and popularize such three-dimensional applications. The areas of 3D applications ranging from military applications, entertainment applications geared up for education. Within the applications related to education, we highlight the applications that create virtual copies of cultural spaces such as museums. Through this copy, you can virtually visit a museum, see other users, communicate, exchange information on works, etc. Thereby allowing the visit museums physically distant remote users. A major problem of such virtual environments is its update. By dealing with various media (text, images, sounds, and 3D models), its subsequent handling and update on a virtual environment requires staff with specialized knowledge. Speaking of museums, they hardly have people on your team with this profile. Inside the GT-MV (Grupo de Trabalho de Museus Virtuais), funded by RNP (Rede Nacional de Ensino e Pesquisa) propose a portal for registration, amendment and seen collaborative virtual museums of Brazil. The update, be it related to work or physical space, a system with a national scale like this, would be impossible if done only by the project team. Within this scenario, we propose the modeling and implementation of a tool that allows editing of virtual spaces in an easy and intuitive as compared with available tools. Within the context of GT-MV, we apply the SAMVC (Sistema de Autoria de Museus Virtuais Colaborativos) to museums where curators build the museum from a 3D floor plan (2D). The system, from these twodimensional information, recreates the equivalent in three dimensions. With this, through little or no training, team members from each museum may be responsible for updating the system

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To manage the complexity associated with the management of multimedia distributed systems, a solution must incorporate concepts of middleware in order to hide specific hardware and operating systems aspects. Applications in these systems can be implemented in different types of platforms, and the components of these systems must interact each with the other. Because of the variability of the state of the platforms implementation, a flexible approach should allow dynamic substitution of components in order to ensure the level of QoS of the running application . In this context, this work presents an approach in the layer of middleware that we are proposing for supporting dynamic substitution of components in the context the Cosmos framework , starting with the choice of target component, rising taking the decision, which, among components candidates will be chosen and concluding with the process defined for the exchange. The approach was defined considering the Cosmos QoS model and how it deals with dynamic reconfiguration

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Distributed multimedia systems have highly variable characteristics, resulting in new requirements while new technologies become available or in the need for adequacy in accordance with the amount of available resources. So, these systems should provide support for dynamic adaptations in order to adjust their structures and behaviors at runtime. This paper presents an approach to adaptation model-based and proposes a reflective and component-based framework for construction and support of self-adaptive distributed multimedia systems, providing many facilities for the development and evolution of such systems, such as dynamic adaptation. The propose is to keep one or more models to represent the system at runtime, so some external entity can perform an analysis of these models by identifying problems and trying to solve them. These models integrate the reflective meta-level, acting as a system self-representation. The framework defines a meta-model for description of self-adaptive distributed multimedia applications, which can represent components and their relationships, policies for QoS specification and adaptation actions. Additionally, this paper proposes an ADL and architecture for model-based adaptation. As a case study, this paper presents some scenarios to demonstrate the application of the framework in practice, with and without the use of ADL, as well as check some characteristics related to dynamic adaptation

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O domínio alvo deste trabalho são os sistemas colaborativos distribuídos onde o foco está na troca dê mensagens entre usuários remotamente distribuídos. Nestes sistemas, há a necessidade das mensagens possuírem conteúdo multimídia e poderem ser entregues tanto a um usuário específico quanto a um grupo ou grupos de usuários. O objetivo deste trabalho é desenvolver um framework que facilite: a construção desse tipo de sistymas e diminua o tempo gasto com desenvolvimento através da técnica de reuso. Este trabalho apresenta o N2N Framework - Uma plataforma para desenvolvimento de Sistemas Colaborativos Distribuídos. O Framework foi concebido através da análise do comportamento de aplicações com características de multimídias colaborativas, como ambientes virtuais multi-usuários, chats, enquetes, e torcidas virtuais. O Framework foi implementado usando-se a plataforma Java. O N2N Framework facilita o design e implementação de sistemas colaborativos distribuídos, implementando a entrega das mensagens, e direcionando o desenvolvedor de aplicações para a preocupação com implementação de suas mensagens específicas e o processamento que delas decorre

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The speed and fluidity are basic requirements for reproduction of big capitalism. Thus, the objects and their actions seek to meet these aspirations of hegemony. And among these objects, there is emphasis on the road systems of movement, made up of bridges, viaducts and tunnels, engineering works that cater to this nee increasingly evident in the current period technical-scientific-informational. So on this premise, it becomes apparent that these objects reflect the technical So on this premise, it becomes apparent that these objects reflect the technical space constitution of Natal, capital of Rio Grande do Norte, where the road systems of movement help to understand the process of fragmentation and and spatial segregation of Natal, accelerated in the late twentieth century. Using the analysis as a tool for urban legislation developed in the capital of RN by the municipal administration, this paper seeks to understand, through a matrix of periodization, as these systems move natalense shaped space and which exists for the hegemonic logic limit the formation and location of each of these systems move road, particularly as it concerns the relationship between these and the expansion of opportunities for certain fluidity between the road systems of movement (fixed), their flow

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Ciência da Computação - IBILCE

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Pós-graduação em Engenharia Mecânica - FEG

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In-Car Navigation System and Route Guidance (RGNS), commercial or free, have adopted different graphic designs to maps which support the navigation task. This paper aims at evaluating the driver's subjective preference for colors to represent route and arrow direction in maps for these systems. A total of 54 drivers (27 males and 27 females) participated in an experiment which was performed in a parked vehicle. Two cartographic representations were produced to evaluate the route color and other two for the arrow color. The route was symbolized by black or blue color and the arrow direction by green or red hue. The cartographic representations were presented in a seven-inch navigation monitor. The results indicate that most drivers prefer the navigation route in black color. However, drivers who regularly use navigation systems have presented the tendency to prefer the route in blue hue. The direction arrow in green hue was the mostly preferred by the drivers and there was no significant correlation between different individual characteristics. This study concludes that drivers' preference was influenced by different factors, such as grouping by color, shape and proximity, subjective or conventional association, as well as by the level of contrast among the map features. Evaluating the performance of cartographic representations in route following task is recommended, in order to support the influence of graphic designs to maps in usability of route guidance systems.

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A radiação solar constitui-se numa inesgotável fonte energética, havendo um enorme potencial de utilização por meio de sistemas de captação e conversão em outra forma de energia. Para a conversão direta da energia solar em elétrica, são utilizadas células fotovoltaicas constituídas, que associadas constituem um módulo fotovoltaico, sendo que também quando agrupados, formam painéis fotovoltaicos. Estes painéis associados a outros equipamentos que transformam ou armazenam energia elétrica para que ela possa ser utilizada é chamado de sistema fotovoltaico. Neste trabalho, foram determinadas analiticamente formas de obtenção de curvas de corrente e potência fotovoltaicas, e também o ponto de potência máxima. Tais métodos foram aplicados no sistema fotovoltaico localizado na FCA/UNESP, sendo utilizado um sistema constituído por três módulos fotovoltaicos. Para o desenvolvimento das equações que regem a potência dos sistemas fotovoltaicos, procurou-se estudar o circuito elétrico de células fotovoltaicas, sendo necessária também a aplicação de métodos numéricos iterativos para a determinação de alguns parâmetros elétricos. De acordo com os teoremas apresentados, foi possível determinar as expressões analíticas da resistência série e do ponto de potência máxima de uma célula fotovoltaica, possibilitando a geração dos gráficos de tais funções com os dados obtidos experimentalmente. Comparando-se os valores obtidos pelas funções com os valores padrões do sistema fotovoltaico instalado, o valor calculado apresentou um erro de 1,03% em relação ao dado pelo fabricante, representando uma excelente aproximação. Desta forma, pode-se concluir que os métodos e teoremas dos sistemas fotovoltaicos apresentados podem servir de auxílio a futuros dimensionamentos para aplicações destes sistemas.

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The education designed and planned in a clear and objective manner is of paramount importance for universities to prepare competent professionals for the labor market, and above all can serve the population with an efficient work. Specifically, in relation to engineering, conducting classes in the laboratories it is very important for the application of theory and development of the practical part of the student. The planning and preparation of laboratories, as well as laboratory equipment and activities should be developed in a succinct and clear way, showing to students how to apply in practice what has been learned in theory and often shows them why and where it can be used when they become engineers. This work uses the MATLAB together with the System Identification Toolbox and Arduino for the identification of linear systems in Linear Control Lab. MATLAB is a widely used program in the engineering area for numerical computation, signal processing, graphing, system identification, among other functions. Thus the introduction to MATLAB and consequently the identification of systems using the System Identification Toolbox becomes relevant in the formation of students to thereafter when necessary to identify a system the base and the concept has been seen. For this procedure the open source platform Arduino was used as a data acquisition board being the same also introduced to the student, offering them a range of software and hardware for learning, giving you every day more luggage to their training

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The education designed and planned in a clear and objective manner is of paramount importance for universities to prepare competent professionals for the labor market, and above all can serve the population with an efficient work. Specifically, in relation to engineering, conducting classes in the laboratories it is very important for the application of theory and development of the practical part of the student. The planning and preparation of laboratories, as well as laboratory equipment and activities should be developed in a succinct and clear way, showing to students how to apply in practice what has been learned in theory and often shows them why and where it can be used when they become engineers. This work uses the MATLAB together with the System Identification Toolbox and Arduino for the identification of linear systems in Linear Control Lab. MATLAB is a widely used program in the engineering area for numerical computation, signal processing, graphing, system identification, among other functions. Thus the introduction to MATLAB and consequently the identification of systems using the System Identification Toolbox becomes relevant in the formation of students to thereafter when necessary to identify a system the base and the concept has been seen. For this procedure the open source platform Arduino was used as a data acquisition board being the same also introduced to the student, offering them a range of software and hardware for learning, giving you every day more luggage to their training