561 resultados para Ciência da computação


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Este trabalho apresenta uma proposta metodológica para o ensino de Ciência da Computação para Crianças, elaborada, a partir de pesquisas e estudos, tendo, como objetivo, a aplicação dessa metodologia para correção e testes. Devido à disseminação dos computadores e de seu uso como parte da formação dos alunos, muito se tem discutido sobre a união entre os recursos tecnológicos e a educação. A inclusão da informática no processo educativo vem sendo direcionada para a utilização e classificação de produtos de software educacional, em técnicas de comunicação à distância, no uso de recursos de multimídia ou de realidade virtual para apoio ao conteúdo abordado pelo professor e, também, para a construção de ambientes computacionais, que possam proporcionar uma mudança de paradigma educacional. No entanto não adianta tornar disponível toda essa tecnologia, se, rapidamente, são abandonadas e são substituídas ferramentas e técnicas dentro da Computação. Por isto, tão importante quanto o ensino das tecnologias correntes é o ensino dos conceitos fundamentais da Ciência da Computação. Esses conceitos, além de proporcionarem um embasamento teórico para entendimento da ciência envolvida na computação, também propiciam o desenvolvimento de um raciocínio lógico e formal, assim como de habilidades que são exigidas no mundo atual. Este trabalho apresenta pesquisas de campo sobre o uso da Informática Educativa em algumas escolas, a identificação, através de professores da graduação e pós-graduação, de alguns dos conceitos fundamentais da Ciência da Computação e uma pesquisa sobre o que crianças gostariam de aprender sobre Ciência da Computação. A partir dos resultados, são elaboradas teorias, demonstrações e exercícios para o ensino destes para crianças. Essa metodologia é aplicada a duas turmas heterogêneas de crianças para sua validação. Pretende-se que o estudo desses conceitos aguce o senso crítico e capacite as crianças não só a usarem as tecnologias mas também a entenderem seu funcionamento.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Este trabalho tem por objetivo relatar os resultados preliminares de uma experiência de integração curricular, em andamento na Escola de Informática da UCPel, na área de fundamentos matemáticos da Ciência da Computação. A concepção curricular da experiência está baseada nas idéias de Basil Bernstein sobre currículos de coleção e/ou integração, na idéia de desenvolvimento autônomo do aluno e na organização do ensino em forma semi-presencial (com apoio da Internet) e cooperativa (com apoio de softwares matemáticos).

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One of the current challenges of Ubiquitous Computing is the development of complex applications, those are more than simple alarms triggered by sensors or simple systems to configure the environment according to user preferences. Those applications are hard to develop since they are composed by services provided by different middleware and it is needed to know the peculiarities of each of them, mainly the communication and context models. This thesis presents OpenCOPI, a platform which integrates various services providers, including context provision middleware. It provides an unified ontology-based context model, as well as an environment that enable easy development of ubiquitous applications via the definition of semantic workflows that contains the abstract description of the application. Those semantic workflows are converted into concrete workflows, called execution plans. An execution plan consists of a workflow instance containing activities that are automated by a set of Web services. OpenCOPI supports the automatic Web service selection and composition, enabling the use of services provided by distinct middleware in an independent and transparent way. Moreover, this platform also supports execution adaptation in case of service failures, user mobility and degradation of services quality. The validation of OpenCOPI is performed through the development of case studies, specifically applications of the oil industry. In addition, this work evaluates the overhead introduced by OpenCOPI and compares it with the provided benefits, and the efficiency of OpenCOPI s selection and adaptation mechanism

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In this work will applied the technique of Differential Cryptanalysis, introduced in 1990 by Biham and Shamir, on Papílio s cryptosystem, developed by Karla Ramos, to test and most importantly, to prove its relevance to other block ciphers such as DES, Blowfish and FEAL-N (X). This technique is based on the analysis of differences between plaintext and theirs respective ciphertext, in search of patterns that will assist in the discovery of the subkeys and consequently in the discovery of master key. These differences are obtained by XOR operations. Through this analysis, in addition to obtaining patterns of Pap´ılio, it search to obtain also the main characteristics and behavior of Papilio throughout theirs 16 rounds, identifying and replacing when necessary factors that can be improved in accordance with pre-established definitions of the same, thus providing greater security in the use of his algoritm

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With the advance of the Cloud Computing paradigm, a single service offered by a cloud platform may not be enough to meet all the application requirements. To fulfill such requirements, it may be necessary, instead of a single service, a composition of services that aggregates services provided by different cloud platforms. In order to generate aggregated value for the user, this composition of services provided by several Cloud Computing platforms requires a solution in terms of platforms integration, which encompasses the manipulation of a wide number of noninteroperable APIs and protocols from different platform vendors. In this scenario, this work presents Cloud Integrator, a middleware platform for composing services provided by different Cloud Computing platforms. Besides providing an environment that facilitates the development and execution of applications that use such services, Cloud Integrator works as a mediator by providing mechanisms for building applications through composition and selection of semantic Web services that take into account metadata about the services, such as QoS (Quality of Service), prices, etc. Moreover, the proposed middleware platform provides an adaptation mechanism that can be triggered in case of failure or quality degradation of one or more services used by the running application in order to ensure its quality and availability. In this work, through a case study that consists of an application that use services provided by different cloud platforms, Cloud Integrator is evaluated in terms of the efficiency of the performed service composition, selection and adaptation processes, as well as the potential of using this middleware in heterogeneous computational clouds scenarios

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Pós-graduação em Ciência da Computação - IBILCE

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Pós-graduação em Ciência da Informação - FFC

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Pós-graduação em Ciência da Computação - IBILCE

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T he people’s daily lives are surrounded by computing devices, with increasing resources (sensors) and, with increasing processing. How these devices communicate is still not natural and This retards the growth of Ubiquitous Computing. This paper presents a way in which these devices can communicate using Jini technology and concepts of Service Oriented Architecture, applying these concepts in a test case of Ubiquitous Computing. To conduct the test case was constructed a fictitious system for management of a soccer championship, where users can interact with each other and with the system in a simplified way, have access to data in real time of the championship during the event. This communication is performed by services built using Jini technology, which were based on key SOA concepts, such as modularity and reusability

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Pós-graduação em Ciência da Computação - IBILCE

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Pós-graduação em Ciência da Computação - IBILCE

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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This undergraduate thesis aims formally define aspects of Quantum Turing Machine using as a basis quantum finite automata. We introduce the basic concepts of quantum mechanics and quantum computing through principles such as superposition, entanglement of quantum states, quantum bits and algorithms. We demonstrate the Bell's teleportation theorem, enunciated in the form of Deutsch-Jozsa definition for quantum algorithms. The way as the overall text were written omits formal aspects of quantum mechanics, encouraging computer scientists to understand the framework of quantum computation. We conclude our thesis by listing the Quantum Turing Machine's main limitations regarding the well-known Classical Turing Machines

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This undergraduate thesis aims formally define aspects of Quantum Turing Machine using as a basis quantum finite automata. We introduce the basic concepts of quantum mechanics and quantum computing through principles such as superposition, entanglement of quantum states, quantum bits and algorithms. We demonstrate the Bell's teleportation theorem, enunciated in the form of Deutsch-Jozsa definition for quantum algorithms. The way as the overall text were written omits formal aspects of quantum mechanics, encouraging computer scientists to understand the framework of quantum computation. We conclude our thesis by listing the Quantum Turing Machine's main limitations regarding the well-known Classical Turing Machines