<p>As software increases in complexity and relies more on Internet and Web technology, the challenge of enabling interaction and communication between loosely coupled applications becomes increasingly vital. Distributed computing presents challenges to loosely coupled applications that require means with which to interact and communicate. There exist technologies that are aimed at solving these problems; Web service is one such technology. Web service is a relatively new and rapidly maturing technology in the area of distributed computing; it offers a standards-based way to exchange information in an interoperable manner. This thesis is done in partnership with StruSoft and attempts to provide a solution to their problem of distributed computing, by using Web service technology. The paper looks at distributed systems and various solutions to the problems associated with distributed computing. A comprehensive insight into Web service technology is provided, along with rationale as to why it is chosen for the project. In addition, there are guidelines as to how the necessary components of Web service are installed. Development of License Management Software is also a part of this thesis. The software offers a means with which to store and maintain data about customers and their licenses. Security is a major focus of this paper and thus extensively mentioned throughout. A detailedexplanation of computer security is presented, along with the necessary configurations that are needed to make the Web service and the License Management Software more secure.</p>

Recently much research effort has been devoted to the discovery of relevant Web services. It is widely recognized that adding semantics to service description is the solution to this challenge. Web services with explicit semantic annotation are called Semantic Web Services (SWS). This research proposes an indexation and discovery architecture for SWS, together with a prototype application in the area of bioinformatics. In this approach, a SWS repository is created and maintained by crawling both ontology-oriented UDDI registries and Web sites that hosting SWS. For a given service request, the proposed system invokes the matching algorithm and a candidate set is returned with different degree of matching considered. This approach can add more flexibility to the current industry standards by offering more choices to both the service requesters and publishers. Also, the prototype developed in this research shows the value can be added by using SWS in application areas such as bioinformatics.

In this thesis, a semantically aided web service and restful service search mechanism is presented that makes use of an ontology. The mechanism relates method names, input and output parameters for ontology guided matches and offers results with varying relevance corresponding to the matching degree. The mechanism is demonstrated using an experimental domain that is tourism and travel. An ontology is created to support a set of web services that exist in this domain.

This thesis presents an approach to design, specify, validate, verify, implement, and evaluate composed web/grid services. Web and grid services can be composed to create new services with complex behaviours. The BPEL (Business Process Execution Language) standard was created to enable the orchestration of web services, but there have also been investigation of its use for grid services. BPEL specifies the implementation of service composition but has no formal semantics; implementations are in practice checked by testing. Formal methods are used in general to define an abstract model of system behaviour that allows simulation and reasoning about properties. The approach can detect and reduce potentially costly errors at design time. CRESS (Communication Representation Employing Systematic Specification) is a domainindependent, graphical, abstract notation, and integrated toolset for developing composite web service. The original version of CRESS had automated support for formal specification in LOTOS (Language Of Temporal Ordering Specification), executing formal validation with MUSTARD (Multiple-Use Scenario Testing and Refusal Description), and implementing in BPEL4WS as the early version of BPEL standard. This thesis work has extended CRESS and its integrated tools to design, specify, validate, verify, implement, and evaluate composed web/grid services. The work has extended the CRESS notation to support a wider range of service compositions, and has applied it to grid services as a new domain. The thesis presents two new tools, CLOVE (CRESS Language-Oriented Verification Environment) and MINT (MUSTARD Interpreter), to respectively support formal verification and implementation testing. New work has also extended CRESS to automate implementation of composed services using the more recent BPEL standard WS-BPEL 2.0.

Τόσο τα Web Services (WS) όσο και τα P2P Συστήματα, δύο ακμάζουσες μορφές της πληροφορικής και του Διαδικτύου, έχουν τύχει ευρείας αποδοχής στις μέρες μας. Τα Napster, Gnutella και LimeWire, αποτελούν λίγες μόνο από τις υλοποιήσεις της τεχνολογίας των P2P Συστημάτων. Από την άλλη τα WS ακμάζουν στον χώρο των επιχειρήσεων και του επιχειρηματικού σχεδιασμού με κατεύθυνση το Internet. Τα e-Bay, Amazon και Microsoft είναι μόνο λίγες από τις εταιρείες που κάνουν ευρεία χρήση των τεχνολογιών των WS. Μέχρι σήμερα οι δύο αυτές τεχνολογίες αναπτύσσονται σχεδόν ξεχωριστά η μία από την άλλη. Το κίνητρο το οποίο ενέπνευσε αυτή την εργασία, ήταν η ύπαρξη του UDDI κεντρικού καταλόγου για την αναζήτηση και εκτέλεση των WS. Ο τρόπος υλοποίησής και λειτουργίας του UDDI καταλόγου, επιφέρει ένα σημαντικό μειονέκτημα, την κεντρικοποίηση του ίδιου του UDDI καταλόγου και την πλήρη απουσία κατανομής του. Τοποθετώντας, όλη την πληροφορία σε ένα σημείο, πολύ γρήγορα μπορούν να εμφανιστούν προβλήματα bottleneck και επομένως κατακόρυφης πτώσης της απόδοσης ενός συστήματος. Βασικός στόχος επομένως, είναι πώς θα μπορούσε ο UDDI κατάλογος να κατανεμηθεί ώστε να βελτιωθούν οι χρόνοι ανακάλυψης και εκτέλεσης των WS που βρίσκονται σε αυτόν. Στην προσπάθεια αυτή συγκαταλέγεται η λειτουργικότητα και η δομή των P2P Συστημάτων, ως κατανεμημένων δομών. Στην παρούσα Μεταπτυχιακή εργασία έγινε μια προσπάθεια συγκερασμού των τεχνολογιών των P2P Συστημάτων και των WS, ώστε εξάγοντας τα πλεονεκτήματα από το καθένα, κατασκευάστηκε ένα P2P Σύστημα το οποίο μπορεί να κατανέμει WS και να υποστηρίζει αποδοτικότερη και ταχύτερη ανακάλυψη απ’ ότι στον UDDI κατάλογο. Στην προσπάθεια αυτή ενσωματώθηκαν περαιτέρω, ορισμένες παράμετροι ποιότητας υπηρεσίας των Web Services (Quality of Web Services - QoWS). Βάση αυτών δίνεται η δυνατότητα αποδοτικότερης αναζήτησης WS και η εξαγωγή αμεσότερων αποτελεσμάτων. Οι τεχνολογίες που εξυπηρέτησαν ως υπόβαθρο ανάπτυξης είναι το P-Grid, P2P πρωτόκολλο επικοινωνίας, καθώς και το Gridella, η GUI υλοποίηση αυτού, για την ανακάλυψη αρχείων σε ένα P-Grid P2P δίκτυο. Εν τέλη, εξάγονται συμπεράσματα μέσα από πειράματα και μετρήσεις στην λειτουργία της πρότυπης εφαρμογής, που ονομάστηκε WS-Grid. / -

Web 2.0 nimmt in vielen Unternehmen eine zunehmend gewichtigere Rolle in deren aktuellen und künftigen Geschäftsmodellen ein. Dieser Entwicklung entspringt der Begriff „Corporate Web 2.0“, welcher den Einsatz von Web-2.0-Anwendungen im Business-Kontext bezeichnet. Hohe Komplexität und fehlende Strukturen lassen derzeit im Web 2.0 einen systematischen, lernorientierten Vergleich von Business- Cases nur eingeschränkt zu. Die vorgestellte CWeb 2.0 Profile-Map ermöglicht als Schema zur Charakterisierung und Kategorisierung von Web 2.0-Fallbeispielen eine systematische, Businesskontext-abhängige Beschreibung und Kategorisierung. Vergleichbare Anwendungen des Web 2.0 können so besser erkannt und Erfahrungen aus einzelnen Anwendungsfällen über Organisationsgrenzen hinweg effektiver transferiert werden.

Made available in DSpace on 2014-12-17T15:48:10Z (GMT). No. of bitstreams: 1 SidneySM_DISSERT.pdf: 1456214 bytes, checksum: c5c3a8fc051effaff1597d26ba83ee87 (MD5) Previous issue date: 2013-12-12 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Web services are computational solutions designed according to the principles of Service Oriented Computing. Web services can be built upon pre-existing services available on the Internet by using composition languages. We propose a method to generate WS-BPEL processes from abstract specifications provided with high-level control-flow information. The proposed method allows the composition designer to concentrate on high-level specifi- cations, in order to increase productivity and generate specifications that are independent of specific web services. We consider service orchestrations, that is compositions where a central process coordinates all the operations of the application. The process of generating compositions is based on a rule rewriting algorithm, which has been extended to support basic control-flow information.We created a prototype of the extended refinement method and performed experiments over simple case studies / Os servi?os web s?o solu??es computacionais criadas de acordo com os princ?pios da Com- puta??o Orientada a Servi?os e disponibilizadas via Internet. Novos servi?os web podem surgir a partir outros pr?-existentes, utilizando linguagens de composi??o. Considerando orquestra??es de servi?os, onde existe um processo central que coordena todas as opera- ??es da aplica??o, propomos um m?todo para gera??o de processos WS-BPEL, a partir de especifica??es abstratas dotadas de informa??es de controle. O m?todo proposto permite ao projetista da composi??o se concentrar em especifica??es de alto n?vel, aumentando sua produtividade e gerando especifica??es independentes de servi?os web espec?ficos. O processo de gera??o de composi??es se baseia em um algoritmo de reescrita de regras, que foi estendido para dar suporte a informa??es de controle b?sicas. Criamos um prot?tipo do m?todo de refinamento estendido e realizamos experimentos sobre estudos de caso simples

Made available in DSpace on 2016-06-02T19:05:35Z (GMT). No. of bitstreams: 1 2565.pdf: 3480971 bytes, checksum: d77b25ab6ff234cafc2664267466f051 (MD5) Previous issue date: 2009-05-25 / Financiadora de Estudos e Projetos / Existing mechanisms for Grid Service (GS) security control do not allow transparently binding different user roles and permissions in the access control for operations and resources. After successfuly authenticated a user may access all registered services. This dissertation presents the GS Security Architecture (GSSA), a security architecture for GSs based on the Open GSs Architecture (OGSA), which aims to fullfil this gap. GSSA also provides funcionalites for authentication, log keeping for non-repudiation, auditing and accountability, secure data exchange between GS, and the execution of GSs from withn Web Services (WS). This dissertation also describes an implementation of the GSSA, named GS Security Proxy (GSSP), and evaluates the use of this proxy in a telemedicine application. / Mecanismos disponíveis para segurança de Grid Service (GS) não permitem associar, transparentemente, diferentes papéis de usuários a diferentes permissões no controle de acesso às operações e recursos. De maneira geral, uma vez autenticado em um sistema, um usuário tem acesso a todos os serviços definidos. Esta dissertação apresenta GS Security Architecture (GSSA), uma arquitetura de segurança baseada na Open GSs Architecture (OGSA), que visa a suprir esta deficiência. GSSA também fornece funcionalidades para autenticação, registro de log para não repúdio, auditoria e responsabilização (accountability), integridade e confidencialidade das mensagens trocadas entre os GSs e a execução de GSs a partir de Web Services (WS). Esta dissertação descreve também uma implementação de GSSA chamada GS Security Proxy (GSSP) e avalia o uso deste proxy em uma aplicação da telemedicina.

Submitted by Maike Costa (maiksebas@gmail.com) on 2017-06-29T15:06:59Z No. of bitstreams: 1 arquivototal.pdf: 2340814 bytes, checksum: bdce9ccd956442015a53d57f06a00741 (MD5) / Made available in DSpace on 2017-06-29T15:06:59Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2340814 bytes, checksum: bdce9ccd956442015a53d57f06a00741 (MD5) Previous issue date: 2016-08-23 / Software Engineering is a discipline that encompasses all aspects of the production of a software system, from the early stages of the system specification to maintenance, when the system is already being used. A very interesting area in Software Engineering is software reuse, which impacts positively on reducing time, costs and risks in software development processes. Therefore, it can be stated that software reuse improves not only the software development process, but also the product itself. One of the main approaches for software reuse is service oriented development, which adopts the Service-Oriented Architecture (SOA) paradigm. In SOA, services represent a natural evolution of component-based development, and therefore can be defined as loosely coupled, reusable software components, that encapsulate discrete functionality, can be distributed and remotely accessed through coding. It is important to highlight that while SOA is an architectural paradigm for developing software systems, Web Services represent the most widely existing technology adopted to implement SOA exploring protocols based on Internet standards and on XML. With the growth of the market and the use of web services, the tendency is always increase the number of services available for assembly applications in different contexts, making impractical the task of manually selecting the services required to compose a software system. Consequently, one can state that the effort needed to select the required services tends to increase more and more, creating a problem with a large and complex search space, making it necessary the automation of the selection process based on metaheuristic search techniques. In this context, the proposed work aims to automate the web services selection process using techniques of Search-Based Software Engineering, in which the selection strategy is guided by structural and functional metrics that have the purpose of evaluating the similarity between the specifications and respective implementations of candidate services as well as their dependencies, thus reducing the effort of adaptation and integration of web services developed by different suppliers. / Engenharia de Software é uma disciplina que engloba todos os aspectos da produção de um sistema de software, incluindo desde os estágios iniciais da especificação do sistema até sua manutenção, quando o sistema já está sendo utilizado. Uma área de estudo bastante interessante da Engenharia de Software é o reuso de software, que impacta positivamente na redução do tempo, dos custos e dos riscos provenientes de um processo de desenvolvimento de software. Portanto, é possível afirmar que o reuso de software melhora, não apenas o processo de desenvolvimento de software, mas também o próprio produto. Uma das principais abordagens de reuso de software é o desenvolvimento orientado a serviços, que adota o paradigma da Arquitetura Orientada a Serviços (SOA – Service-Oriented Architecture). No paradigma SOA, serviços representam uma evolução natural do desenvolvimento baseado em componentes, e, portanto, podem ser definidos como componentes de software de baixo acoplamento, reusáveis, que encapsulam funcionalidades discretas, que podem ser distribuídos e acessados remotamente de forma programática. É importante destacar que, enquanto SOA é um paradigma arquitetural para desenvolvimento de sistemas de software, serviços web (web services) representam a tecnologia existente mais amplamente adotada para implementar SOA explorando protocolos baseados em padrões da internet e em XML (eXtensible Markup Language). Com o crescimento do mercado e utilização dos serviços web, a tendência é sempre aumentar o número de serviços disponíveis para montagem de aplicações em diferentes contextos, tornando impraticável a tarefa de selecionar de forma manual os serviços requeridos para compor um sistema de software. Consequentemente, é possível afirmar que o esforço necessário para selecionar os serviços requeridos tende a aumentar cada vez mais, gerando um problema com um grande e complexo espaço de busca, tornando necessária a automatização do processo de seleção baseada em técnicas de busca metaheurística. Neste contexto, o trabalho proposto visa automatizar o processo de seleção de serviços web utilizando técnicas da Engenharia de Software Baseada em Buscas, cuja estratégia de seleção é orientada por métricas funcionais e estruturais, que têm o propósito de avaliar a similaridade entre as especificações e as respectivas implementações dos serviços candidatos, bem como as suas dependências, reduzindo assim o esforço de adaptação e integração de serviços web desenvolvidos por fornecedores distintos.

Made available in DSpace on 2014-12-17T14:55:03Z (GMT). No. of bitstreams: 1 FabioAPP.pdf: 1226499 bytes, checksum: 476c4c4dd5d62663a94a43090900b128 (MD5) Previous issue date: 2006-05-19 / &#65279;The popularization of the Internet has stimulated the appearance of Search Engines that have as their objective aid the users in the Web information research process. However, it s common for users to make queries and receive results which do not satisfy their initial needs. The Information Retrieval in Context (IRiX) technique allows for the information related to a specific theme to be related to the initial user query, enabling, in this way, better results. This study presents a prototype of a search engine based on contexts built from linguistic gatherings and on relationships defined by the user. The context information can be shared with softwares and other tool users with the objective of promoting a socialization of contexts / &#65279;A populariza??o da Internet estimulou o surgimento das M?quinas de Busca, que t?m como objetivo auxiliar os usu?rios no processo de pesquisa da informa??o na Web. Por?m, ? comum usu?rios formularem consultas e receberem resultados que n?o satisfazem a sua inten??o inicial de pesquisa. A t?cnica Information Retrieval in Context (IRiX) permite que informa??es relacionadas a um determinado tema possam ser atribu?das ? consulta formulada originalmente pelo usu?rio, possibilitando, dessa forma, melhores resultados. Este trabalho apresenta um prot?tipo de M?quina de Busca baseada em contextos constru?dos a partir de um conjunto de sintagmas e de relacionamentos definido pelo usu?rio. As informa??es de contextos podem ser compartilhadas com softwares e com outros usu?rios da ferramenta a fim de promover a socializa??o de contextos.