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It is becoming more common to see software applications taking advantage of the many RESTful web services available publicly to meet their needs rather than developing an in-house solution. This introduces the problem where failures can occur in the network or on the service provider outside the influence of a developer. This paper introduces a reliability-aware framework with a focus on availability...
Considering to the deficiencies of the traditional static model synergies for the dynamic changes of enterprise requirements, this paper proposes a new reliable service recommendation model to support service resource optimization, service choosing, and optimal service recommendations. In this paper, a set of indices and the evaluation methods are discussed for measuring the qualities of services...
Increasing deployment of computer systems in critical applications has made study and quantifiable analysis of these systems as an important issue. This analysis can either be done on real system or by developing analytic models. First approach is less desirable, since such an analysis is typically done in a post-facto manner after any problem has occurred. The modeling approach on the other hand,...
This paper proposes a model to quantify the reliability of web services. Based on their structures, web services can be classified into the following two kinds: atomic web service which calls no other web services and composite web service consisting of atomic web services. The model first evaluates the reliability of atomic web services from the consumers' perspective. After that this paper points...
Web services are increasingly used to integrate and build business application on the internet. Failure of web services is not acceptable in many situations such as online banking, so fault tolerance is a key challenge of web services. Web service architecture still lacks facilities to support fault tolerance. This paper proposes a fault tolerant architecture for web services by increasing the reliability...
Web service selection is an indispensable process for web service composition as to select best web service to a client's requirement. As many web services are increased in the internet for similar functionality, which service will be the best for the client requirement is an elusive task for web service operators. In this paper, we have proposed a web service selection model used to select best web...
Cloud computing is the next stage in evolution of the internet, which provides large amount of computing and storage to customers provisioned as a service over the internet. However, cloud computing facing so many security challenges due to the possible compromise or byzantine failures. In this paper, we focus on Ensuring data storage security in cloud computing, which is an important aspect of Quality...
The idea of the future Internet of Services is to combine several services of numerous service providers to new value-added services or applications. To sell these services on so-called service marketplaces the providers have to ensure both a high quality and a high quality reliability. But how could a provider of a composed service know the quality-reliability of his service without costly tests?...
The availability and reliability of Service-oriented architectures (SOA) depends on two factors: On the one hand, the availability and reliability of the services that provide a certain business functionality and on the other hand the services that make up the underlying SOA platform. For platforms that are supposed to form the core of mission-critical service-oriented applications, this implicates...
The reliability is a major factor that limits the success of promising service oriented architecture in bioinformatics. To evaluate services reliability and availability and create indicators of quality of service, we have defined an XML format designed to exchange service status reports. We demonstrate the interest of sharing status reports between service consumers and producers by providing two...
Nowadays, a number of web services available on the Internet have been increasing rapidly. Similarly functional services are offered by different service providers. Quality of service (QoS) has becomes an important factor to determine the most suitable service provider. Many existing QoS models use uncertain QoS attributes which vary over time and depend on service environment. The service chosen...
In the current implementation of SOA using Web services, where different services can provide the same functionality for consumers, QoSs of these services are essential in determining the most suitable services for consumers. Although QoS for web services has attracted wide attention in the literature for the past few years, most of the current efforts did not consider the multi-stakeholders nature...
Adding Web service quality attributes to queries can help define client goals and improve search results. Search engines greatly facilitate the finding of information on the Web, but how well they retrieve relevant results and accurately rank them can limit Web searching ability. Various studies looking at ways to improve Web search results have determined that identifying the goals of users performing...
This paper analyzes the features of non-functional properties of Web Services, studies their classification, advance a method to dispose the uncertain features with fuzzy sets and grey systems, provide a measurement (i.e. relevance degree, based on rough sets) of dependency among the non-functional properties, which evolves a description (i.e. support degree, based on rough sets too) of essentiality...
To objectively assess quality of web services, we propose a six-dimensional QoWS model which includes expected QoWS, agreed QoWS, delivered QoWS, perceived QoWS, transmitted QoWS, and statistic QoWS. Then a trusted QoWS monitoring model is presented. It adopts Simple Network Management Protocol (SNMP) to respectively capture delivered QoWS, perceived QoWS, and transmitted QoWS. A new style assessment...
With the converging of grid computing and Web service, grid has extended its territory from traditional computing grid to service oriented grid, aiming to realize coordinated resource sharing and problem solving through service selection and composition. Therefore, selecting credible services for applications becomes a key issue in grid environment. To ensure this, a Bayesian network based approach...
Selection of an appropriate Web service for a particular task has become a difficult challenge due to the increasing number of Web services offering similar functionalities. The functional properties describe what the service can do and the non-functional properties depict how the service can do it. Non-functional properties involving qualitative or quantitative features have become essential criteria...
Runtime QoS-aware service selection is difficult because the number of web services providing similar functionality is large and constantly changing, and, even more challenging, due to the complicated structure of composite services. This paper proposes an efficient divide-and-conquer approach for service selection based on a high-level abstract model for service composition. The service composition...
In a service-oriented architecture (SOA), the orchestration of services to new services and complex workflows is a common approach. Because the complexity and capability of the orchestrated services are increased, it is important to maintain and ensure the dependability attributes, e.g. availability and reliability, in such an environment. Today, most approaches focus on the needs during the creation...
The main objective of this paper is to enhance the availability of Composite Real-Time Multimedia Web Services through load balanced redundant Web Services. The Composite Real-Time Multimedia Web Service (CRMWS) allows the services to be automatically composed from components of distributed web services, detecting faults and providing alternate services based on Service Level Agreements (SLA). The...
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