Orientador: Maria Beatriz Felgar de Toledo / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-08-08T13:37:39Z (GMT). No. of bitstreams: 1 Garcia_DiegoZuquimGuimaraes_M.pdf: 1006389 bytes, checksum: 8016f0659ec60b1ef54c6aaf41fba177 (MD5) Previous issue date: 2007 / Resumo: A tecnologia de serviços Web possui algumas propriedades importantes para o desenvolvimento e a execução de aplicações distribuídas. Entretanto, ela ainda não oferece apoio para tratar as características não-funcionais dos serviços. Os consumidores de serviços Web podem requerer serviços com parâmetros de qualidade específicos e esperar garantias de níveis de qualidade. O objetivo desta dissertação é estender o modelo de serviços Web para apoiar a gerência de características não-funcionais para serviços Web. O modelo proposto inclui mediadores para auxiliar na descoberta de serviços de acordo com os requisitos funcionais e não-funcionais dos consumidores e monitores para verificar os atributos de qualidade. As principais contribuições desta dissertação são: a utilização do padrão Web Services Policy Framework (WS-Policy) para complementar as descrições de serviços Web Services Description Language (WSDL) com políticas para atributos de qualidade; uma extensão para o padrão Universal Description Discovery & Integration (UDDI) para a publicação e a descoberta de serviços Web incluindo características nãofuncionais; e o monitoramento e a atualização de características não-funcionais para refletir os atributos reais dos serviços / Abstract: Although the Web service technology allows the development and execution of distributed applications, it still lacks facilities to deal with Quality of Service (QoS). Consumers may require services with particular non-functional characteristics and expect quality level guarantees. The goal of this thesis is to propose an extended Web service architecture supporting QoS management for Web services. It includes brokers to facilitate service selection according to functional and non-functional requirements and monitors to verify QoS attributes. The main contributions of this approach are: the use of the Web Services Policy Framework (WS-Policy) standard to complement Web Services Description Language (WSDL) specifications with QoS policies; an extension to the Universal Description Discovery & Integration (UDDI) standard for QoS-enriched Web service publication and discovery; and QoS updating to reflect actual service attributes / Mestrado / Mestre em Ciência da Computação

Orientador: Maria Beatriz Felgar de Toledo / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-08-15T11:55:40Z (GMT). No. of bitstreams: 1 Rosa_Ricardoda_M.pdf: 1883897 bytes, checksum: 06a13cb1deacddc65e4123779e1ac975 (MD5) Previous issue date: 2010 / Resumo: Computação em grade e um paradigma que permite o compartilhamento de recursos heterogêneos, geograficamente distribuídos e sob administrações independentes. Esse compartilhamento deve ser realizado para otimizar a utilização de recursos e atender os requisitos de qualidade de serviço. Modelos econômicos podem ser aplicados para fornecer uma alocação justa desses recursos e incentivar a disponibilização de um maior número de recursos na grade. Nesta dissertação, será discutida uma arquitetura de grade baseada em modelos econômicos, em especial, os vários modelos de leiloes para permitir negociação entre um fornecedor e vários consumidores de recursos. Serú realizada uma anúlise sobre as diversas modalidades de leilão para verificar o comportamento de consumidores e fornecedores de recursos em um ambiente de grade / Abstract: Grid computing is a paradigm that allows the sharing of heterogeneous resources, geographically distributed and under independent administration. Sharing must be done to optimize the use of resources and meet quality of service requirements. Economic models can be applied to provide a fair allocation of these resources and to promote the entry of a greater number of resources into a grid. In this dissertation, a grid architecture based on economic models will be discussed, in particular, several auction models to allow negotiation between a provider and many consumer of resources. Different types of auction models will be analyzed to verify the behavior of consumers and providers of resources in a grid environment / Mestrado / Sistemas de Computação / Mestre em Ciência da Computação

Made available in DSpace on 2016-08-17T14:53:02Z (GMT). No. of bitstreams: 1 Flavio_Marcilio_Paiva_Ramos.pdf: 2116529 bytes, checksum: ec39ed91f835e580a43ccfbf8a3c4d1a (MD5) Previous issue date: 2009-05-04 / Nowadays, peer-to-peer networks are very popular mainly, when we wish to search or share a considerable amount of information and resources among various participants. One of the main difficulties of this technology is how to avoid that those participants maintain, at the same time, a considerable number of shared resources and to guarantee that those resources are not corrupted or polluted content. Another problem commonly found in P2P networks is the lack of interoperability among existing P2P solutions especially because the inconsistencies of metadata and operation interfaces used in node communication. This work describes P2PWSRep, a reputation management protocol that identifies non-cooperative nodes or that can hinder network performance by sharing corrupted, infected or non-existent files. P2PWSRep infrastructure was based on web services in order to tackle interoperability problems and to facilitate its extensibility, making it feasible to be accessed by several other P2P applications. The P2PWSRep protocol employs a distributed reputation computation using an exponentially weighted average that takes into account the current and previous node reputation and which is tuned by an adjustment parameter in order to obtain the final reputation, thus considering the node s behavior. The P2PWSRep protocol is validated by means of simulation and our results show that it is able to point out the more trustable nodes in the network as well as to insulate those which are not reliable or cooperative. Besides, the protocol does not unnecessarily impacts on the network load P2PWS. / As redes peer-to-peer (P2P) são muito populares atualmente, principalmente quando se deseja buscar ou compartilhar uma grande quantidade de informações e recursos entre os seus participantes. Uma das grandes dificuldades desse tipo de tecnologia é evitar que esses participantes mantenham, ao mesmo tempo, um número considerável de arquivos compartilhados, e ainda garantir que esses arquivos não sejam conteúdo poluído ou corrompido. Outro problema bem comum nas redes P2P, é a falta de interoperabilidade entre as diversas redes existentes, principalmente devido às incompatibilidades dos metadados e das interfaces das operações utilizadas na comunicação entre os nós. Este trabalho descreve o P2PWSRep, um protocolo de gerenciamento de reputação para identificar nós que não desejam cooperar ou que podem prejudicar o desempenho da rede pelo compartilhamento de arquivos corrompidos, infectados ou inexistentes. A infraestrutura da rede do P2PWSRep foi baseada em serviços web para contornar problemas de interoperabilidade e facilitar sua extensibilidade, tornando-o fácil de ser utilizado por diversas aplicações de redes P2P. O protocolo P2PWSRep possui um cállculo de reputação distribuído, utilizando-se uma média ponderada exponencial, que considera o valor da reputação anterior do nó e o valor atual, obtido dos demais nós da rede, e regulado por um parâmetro de ajuste, para obter a reputação final, de forma que o histórico do comportamento do nó seja considerado. O protocolo P2PWSRep é validado por meio de simulação e os resultados obtidos mostram que o mesmo é capaz de apontar os nós ou recursos mais confiáveis da rede, ao mesmo tempo em que isola aqueles nós que não são íntegros ou pouco cooperativos, além de não impor uma sobrecarga desnecessária à rede P2PWS.

Made available in DSpace on 2016-08-17T14:53:23Z (GMT). No. of bitstreams: 1 Dissertacao Wagner Elvio.pdf: 4463476 bytes, checksum: 4fda2686652d403cd2641f98f3b51575 (MD5) Previous issue date: 2012-10-10 / The antivirus system and firewall are protection systems designed to prevent malicious work in the network, thus constituting a barrier to invaders (e.g. vírus, worms e hackers). However, there is no guarantee a full protection to network and computers, invasions can occur by exploiting vulnerabilities, known, and allow running programs remotely, changing privileges within the system and the dissemination of important information. In this case, Intrusion Detection System IDS (Intrusion Detection System) allows the detection of intrusions and subsequent notification to the network administrator or, in conjunction with the firewall blocks the port used in the invasion or the IP address of the attacker. An important factor for the intrusion detection is the quality of subscriber base. However IDS systems are isolated systems and the interoperability among different vendors IDS is complex and difficult to implement. Existing IDS systems in the literature, including the IDS NIDIA (Instrusion-Detection System Network Intrusion Detection System based on Intelligent Agents) are isolated systems, are not easily reused. Generally, they communicate using different protocols and are designed with different programming paradigms. In this work it is proposed an architecture based on the philosophy SOA (Service Oriented Architecture) to support interoperability between IDS systems. The IDS-NIDIA will be adapted and extended according to the SOA philosophy, containing layers of web services in order to provide a static service composition between the layers of the application and reuse of information with other IDS s. / Os sistemas antivírus e firewall são sistemas de proteção que visam impedir a execução de ações maléficas na rede, constituindo, portanto, uma barreira aos invasores (e.g.vírus, worms e hackers). Entretanto, não há como garantir uma proteção total da rede e dos computadores, podendo ocorrer invasões através da exploração de vulnerabilidades, já conhecidas, que permitem a execução de programas remotamente, a alteração de privilégios dentro do sistema e a divulgação de informações importantes. Neste caso, o Sistema de Detecção de Intrusão-IDS(Intrusion Detection System) permite a detecção de intrusões e a consequente notificação ao administrador da rede ou, em conjunto com o firewall, bloqueia a porta utilizada na invasão ou o endereço IP do atacante. Um fator importante para a detecção de intrusões é a qualidade da base de assinaturas. Entretanto os sistemas IDS são sistemas isolados e a interoperabilidade entre IDS de fornecedores diferentes é complexa e de difícil implementação. Os sistemas IDS existentes na literatura, incluindo o IDS-NIDIA (Instrusion Detection System- Network Intrusion Detection System based on Intelligent Agents), são sistemas isolados, não são facilmente reutilizados. Geralmente, estes se comunicam utilizando diferentes protocolos e são criados com paradigmas de programação diferentes. É proposta uma arquitetura baseado na filosofia SOA (Service Oriented Architecture ) para suportar a interoperabilidade entre sistemas IDS. O sistema IDS-NIDIA será adaptado e estendido de acordo com esta filosofia SOA, contendo camadas de serviços web com o propósito de oferecer uma composição de serviço estática entre as camadas de aplicação e o reuso de informações com outros IDS s.

Servicos web sao componentes de software fracamente acoplados projetados para promover a comunicacao interoperavel entre aplicacoes na Internet. O acesso a servicos web da-se de maneira padronizada (via protocolos definidos pelo W3C), independente da linguagem de programacao, sistema operacional ou plataforma em que sao desenvolvidos. Devido a essas caracteristicas, servicos simples podem ser combinados em servicos mais completos. Coreografia consiste em uma abordagem descentralizada para a composicao de servicos. Diferentemente de orquestracoes, abordagem na qual servicos distribuidos sao coordenados de modo centralizado, a interacao entre os servicos de uma coreografia e colaborativa e a coordenacao descentralizada. Apesar das vantagens, o desenvolvimento de coreografias, incluindo as atividades de testes, nao e algo consolidado. O objetivo desta dissertacao foi desenvolver uma arcabouco de teste que facilite o uso de Desenvolvimento Guiado por Testes (Test-Driven Development, TDD) em coreografias de servicos web. Rehearsal, o arcabouco proposto, fornece funcionalidades para o teste automatizado de (i) servicos web atomicos (teste de unidade); (ii) composicao de servicos (teste de integracao) e (iii) uma parte ou toda a coreografia (teste de aceitacao). Esses testes podem ser implementados utilizando funcionalidades do arcabouco, tais como a criacao dinamica de clientes para servicos web, o interceptador de mensagens e a abstracao da coreografia em objetos Java. Alem disso, Rehearsal facilita a criacao e uso de Mocks de servicos web, uma importante pratica de TDD. Além de avaliar o arcabouco desenvolvido, um estudo ex- ploratorio qualitativo foi conduzido com estudantes de Ciencia da Computacao. De acordo com os resultados obtidos, as funcionalidades do Rehearsal mostraram-se adequadas para a utilizacao de TDD em coreografias de servicos web. / Web services are loosely-coupled software components designed to support interoperable machine- to-machine interaction over the Internet. To achieve such interoperability, web services are accesible through W3C web standards, independently of which language, operating system, or hardware platform they are developed. Due to these characteristics, simple web services can be combined in more complex ones. Choreographies are a distributed approach for composing web services. Compared to orchestrations, which have a centralized approach to distributed service management, the interaction among the choreographed services is collaborative with decentralized coordination. Despite the advantages, choreography development, including the testing activities, is not consolidated. The goal of this research is to develop a testing framework to support Test-Driven Development (TDD) of choreographies. Rehearsal, the proposed framework, provides features for automating the testing of (i) atomic web services (unit testing); (ii) their integration in the choreography (integration testing); and (iii) part of or the entire choreography (acceptance testing). These several levels of testing are implemented by using framework features such as the dynamic generation of web service clients, message interception, and the abstraction of the choreography into Java objects. In addition, Rehearsal supports important practices of TDD such as service mocking. To assess the developed framework, we conducted a qualitative exploratory study with Computer Science students. According to the results obtained, the features of Rehearsal were adequate for applying TDD to web service choreography development successfully.

Globalization and innovation are revolutionizing the higher education forcing to create new market trends.Different nations have their own pattern and framework of education in delivering the educational services.Educational institutions are also seeking different organizational and behavioural changes for their better future as they hunt for new financial resources, face new competition and seek greater prestige domestically and internationally. The coming future will decide which universities would survive the market trends, competition and expectations of the students (Clients). The survival-of-the-fittest paradigm framework plays a prominent role in ideas of how the higher education would be delivered to the students in future with the Instruction Technology and distance education. According to us the education trend has changed its phase of delivery of services form the management point of view to student’s point of view.Leading to delivery of educational service’s which would have more impact on student’s education, knowledge and experience within the institution. In our thesis we try to provide some information about how to support and manage the information in Virtual Organizations. We also explore the frameworks of the university and discussed a case study about the different ways of providing better support for information management resulting in delivery of best students driven services and unique facilities. We would be looking at the different aspects of the university work flows and procedures and gain an insight on the student’s expectation from the organization. This investigation would be helpful for the students to know what are the services they should expect from the universities and also helpful for management to know better the needs of the students and their needs and to develop a framework for proper execution of these services. / In an educational environment students should be the first priority. Trusting students is we feel the most important aspect of an educational institution also providing the best possible support to students.after being through the total framework of an organization and different Non- Functional requirements, we conclude that the primary task for better information management and service delivery in any organization is to get the better understanding of the requirements engineering. An organization should have clearly defined stakeholders who would be qualified and filled with commitment to manage their responsibilities with higher priority; also they have to take up the responsibilities for the students.So to achieve a balance among stakeholders there should be a proper negotiation and communication between the stakeholders. In order to achieve that there should be common set of defined rules (say services) through which they could correspond with each other. The stakeholder should be well equipped with the technical nature used to develop and maintain the system.In short the management is the key player in understanding and validating the system and determine whether or not the existing system/process is in control. The most powerful designs are always the result of a continuous process of simplification and refinement. The system could be validated by taking regular feedback from students by handing out a paper for evaluation at various occasions of the different courses. An online, end-of-course plus the experiences of students questions should be designed and should be made a part of students work to fill it in order to get their right perception on the system. These feedbacks could lead to proper student dialogue evaluation. Therefore, eventually controlling and smoothly managing the stakeholders and the services could provide efficient support for the information management in virtual organizations.BTH has the staffs who are concerned about student problems but there is no person responsible for the students whom the students could approach. So BTH should have defined stakeholders who are responsible for the students and to whom the students could approach with their difficulties and problems. The university should show the students that they care for them, this is only possible by the university to go an extra mile for the sake of students and providing better facilities and future prospects for the students. / Kosuri Naga Krishna Kalyan C/O Achanta Srinivas Kungsmarksvagen 69-1412 Karlskrona 37144 Sweden Phone::0046-0704521463 B.B.Pavan Kumar Yadav C/O Achanta Srinivas Kungsmarksvagen 69-1412 Karlskrona 37144 Sweden Phone:0046-0737726964

The service oriented computing paradigm is a new model for distributed computing and due to its simplicity and powerful features, it is being popular and has a wide variety of implementation in different scenarios. The already built system is studies in detail, which was totally implemented using the Grid Technology. The idea of the current work is how we can implement the same functionality in the non-real time environment. The basic idea is to merge the web services and grid services to formulate the unique concept of context dependent quality of service (QoS) for both real time and non-real time solutions. When we merge these different types of services, the main focusing point is to define the service level agreement (SLA) when these different qualified services want to interact with each other. This document discusses and formulates the theoretical aspects, which in future work, can be consider for the practical implementation.

Avec le développement du cloud computing, de nouveaux services voient le jour et il devient primordial que les utilisateurs aient les outils nécessaires pour choisir parmi ses services. La théorie des ensembles approximatifs représente un bon outil de traitement de données incertaines. Elle peut exploiter les connaissances cachées ou appliquer des règles sur des ensembles de données. Le but principal de cette thèse est d'utiliser la théorie des ensembles approximatifs pour aider les utilisateurs de cloud computing à prendre des décisions. Dans ce travail, nous avons, d'une part, proposé un cadre utilisant la théorie des ensembles approximatifs pour la sélection de services cloud et nous avons donné un exemple en utilisant les ensembles approximatifs dans la sélection de services cloud pour illustrer la pratique et analyser la faisabilité de cette approche. Deuxièmement, l'approche proposée de sélection des services cloud permet d’évaluer l’importance des paramètres en fonction des préférences de l'utilisateur à l'aide de la théorie des ensembles approximatifs. Enfin, nous avons effectué des validations par simulation de l’algorithme proposé sur des données à large échelle pour vérifier la faisabilité de notre approche en pratique. Les résultats de notre travail peuvent aider les utilisateurs de services cloud à prendre la bonne décision et aider également les fournisseurs de services cloud pour cibler les améliorations à apporter aux services qu’ils proposent dans le cadre du cloud computing / With the development of the cloud computing technique, users enjoy various benefits that high technology services bring. However, there are more and more cloud service programs emerging. So it is important for users to choose the right cloud service. For cloud service providers, it is also important to improve the cloud services they provide, in order to get more customers and expand the scale of their cloud services.Rough set theory is a good data processing tool to deal with uncertain information. It can mine the hidden knowledge or rules on data sets. The main purpose of this thesis is to apply rough set theory to help cloud users make decision about cloud services. In this work, firstly, a framework using the rough set theory in cloud service selection is proposed, and we give an example using rough set in cloud services selection to illustrate and analyze the feasibility of our approach. Secondly, the proposed cloud services selection approach has been used to evaluate parameters importance based on the users’ preferences. Finally, we perform experiments on large scale dataset to verity the feasibility of our proposal.The performance results can help cloud service users to make the right decision and help cloud service providers to target the improvement about their cloud services

The usage of cloud computing in order to move away from local servers and infrastructure have grown enormously the last decade. The ability to quickly scale capacity of servers and their resources at once when needed is something that can both be a price saver for companies and help them deliver high end products that will function correctly at all times even under heavy load to their customers. To meet todays challenges, one of the strategic directions of Attentec, a software company located in Linköping, is to examine the world of cloud computing in order to deliver robust and scalable applications to their customers. This thesis investigates the usage of cloud services in order to deploy scalable applications which can adapt to usage peaks within minutes.

With the proliferation of Internet, ERP systems like all the domains of Information Technology have known an important evolution. This final thesis project is a study about the evolution of ERP systems, more precisely about their migration to the Web giving birth to a new generation of systems: the Web-Based or Web-enabled ERP systems. This migration to the Web is justified by the difficulty of making possible the communication between partner’s legacy systems and the organizations’ ERP systems. A historical evolution of these systems is presented in order to understand the reasons that lead vendors to adopt the Web Service Technology. Based on different studies, the main technologies such as Web services, Service-Oriented Architecture and Web Application server are also presented. From an interpretative research approach mySAP ERP has been chosen as a case study. This Master’s thesis has been led into AIRBUS France Company within the framework of the SAP Customer Competence Center (SAPCCC) Web site project. The project is aimed at re-building the SAPCCC Web site. The new characteristic of the Web site is to make it accessible by all AIRBUS partners working with SAP applications. To make the Web site accessible by the partners from their own applications located on their own platforms the development has been done thanks to mySAP ERP which is an ERP using the Web service technology. Finally, this thesis presents a comparative study between traditional ERP systems and the new generation of Web-based ERP systems.