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  • 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.
1

Certifica??o de composi??es de servi?os web sem?nticos

Pessini, Evando Carlos 29 July 2014 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-20T20:41:23Z No. of bitstreams: 1 EvandoCarlosPessini_TESE.pdf: 1797248 bytes, checksum: e3b1bb46971f452029930068e9f8babf (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-21T18:18:20Z (GMT) No. of bitstreams: 1 EvandoCarlosPessini_TESE.pdf: 1797248 bytes, checksum: e3b1bb46971f452029930068e9f8babf (MD5) / Made available in DSpace on 2016-01-21T18:18:20Z (GMT). No. of bitstreams: 1 EvandoCarlosPessini_TESE.pdf: 1797248 bytes, checksum: e3b1bb46971f452029930068e9f8babf (MD5) Previous issue date: 2014-07-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Esta tese apresenta um m?todo de certifica??o de composi??es de servi?os web sem?nticos, o qual visa assegurar estaticamente sua corre??o funcional. O m?todo de certifica??o consiste em duas dimens?es de verifica??o, denominadas base e funcional. A dimens?o base ? centrada na verifica??o da correta aplica??o dos servi?os web sem?nticos na composi??o, i.e., visa certificar que as invoca??es de servi?o especificadas na composi??o est?o em conformidade com as respectivas defini??es dos servi?os. A certifica??o desta dimens?o explora a compatibilidade sem?ntica entre os argumentos dados na invoca??o e os par?metros formais do servi?o web sem?ntico. A dimens?o funcional visa certificar que a composi??o cumpre uma dada especifica??o expressa na forma de pr? e p?s-condi??es. Esta dimens?o ? formalizada atrav?s de um c?lculo baseado na l?gica de Hoare. Especifica??es de corre??o parciais envolvendo composi??es de servi?os web sem?nticos podem ser derivadas a partir do sistema dedutivo proposto. Este trabalho caracteriza-se tamb?m por explorar o emprego de um fragmento da l?gica descritiva, i.e., ALC, para expressar as especifica??es de corre??o parciais. Como forma de operacionalizar o m?todo de certifica??o, foi desenvolvido um ambiente de suporte para a defini??o das composi??es de servi?os web sem?nticos, assim como os mecanismos necess?rios para realizar a certifica??o. O m?todo de certifica??o foi avaliado experimentalmente atrav?s da aplica??o em tr?s provas de conceito diferentes. As provas de conceito desenvolvidas possibilitaram avaliar de forma ampla o m?todo de certifica??o proposto / This thesis presents a certification method for semantic web services compositions which aims to statically ensure its functional correctness. Certification method encompasses two dimensions of verification, termed base and functional dimensions. Base dimension concerns with the verification of application correctness of the semantic web service in the composition, i.e., to ensure that each service invocation given in the composition comply with its respective service definition. The certification of this dimension exploits the semantic compatibility between the invocation arguments and formal parameters of the semantic web service. Functional dimension aims to ensure that the composition satisfies a given specification expressed in the form of preconditions and postconditions. This dimension is formalized by a Hoare logic based calculus. Partial correctness specifications involving compositions of semantic web services can be derived from the deductive system proposed. Our work is also characterized by exploiting the use of a fragment of description logic, i.e., ALC, to express the partial correctness specifications. In order to operationalize the proposed certification method, we developed a supporting environment for defining the semantic web services compositions as well as to conduct the certification process. The certification method were experimentally evaluated by applying it in three different proof concepts. These proof concepts enabled to broadly evaluate the method certification
2

Cloud Integrator: uma plataforma para composi??o de servi?os em ambientes de computa??o em nuvem / Cloud Integrator: a platform for composition of services in cloud computing environments

Cavalcante, Everton Ranielly de Sousa 31 January 2013 (has links)
Made available in DSpace on 2014-12-17T15:48:05Z (GMT). No. of bitstreams: 1 EvertonRSC_DISSERT.pdf: 4653595 bytes, checksum: 83e897be68464555082a55505fd406ea (MD5) Previous issue date: 2013-01-31 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / 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 / Com o avan?o do paradigma de Computa??o em Nuvem, um ?nico servi?o oferecido por uma plataforma de nuvem pode n?o ser suficiente para satisfazer todos os requisitos da aplica??o. Para satisfazer tais requisitos, ao inv?s de um ?nico servi?o, pode ser necess?ria uma composi??o que agrega servi?os providos por diferentes plataformas de nuvem. A fim de gerar valor agregado para o usu?rio, essa composi??o de servi?os providos por diferentes plataformas de Computa??o em Nuvem requer uma solu??o em termos de integra??o de plataformas, envolvendo a manipula??o de um vasto n?mero de APIs e protocolos n?o interoper?veis de diferentes provedores. Nesse cen?rio, este trabalho apresenta o Cloud Integrator, uma plataforma de middleware para composi??o de servi?os providos por diferentes plataformas de Computa??o em Nuvem. Al?m de prover um ambiente que facilita o desenvolvimento e a execu??o de aplica??es que utilizam tais servi?os, o Cloud Integrator funciona como um mediador provendo mecanismos para a constru??o de aplica??es atrav?s da composi??o e sele??o de servi?os Web sem?nticos que consideram metadados acerca dos servi?os, como QoS (Quality of Service), pre?os etc. Adicionalmente, a plataforma de middleware proposta prov? um mecanismo de adapta??o que pode ser disparado em caso de falha ou degrada??o da qualidade de um ou mais servi?os utilizados pela aplica??o em quest?o, a fim de garantir sua a qualidade e disponibilidade. Neste trabalho, atrav?s de um estudo de caso que consiste de uma aplica??o que utiliza servi?os providos por diferentes plataformas de nuvem, o Cloud Integrator ? avaliado em termos da efici?ncia dos processos de composi??o de servi?os, sele??o e adapta??o realizados, bem como da potencialidade do seu uso em cen?rios de nuvens computacionais heterog?neas

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