Web Service Composition Method Research Articles

Service Composition Based on Adaptable Revision of Multiple Service Case

In this paper,a hierarchical semantic service case is outlined,which supports overall description of functionality,behavior restraints and features.An adaptable similarity degree measurement is proposed to retrieve a service case which is more similar to the target case and easier to be revised if necessary.Moreover,a method based on the interaction ontology is presented to realize dynamically revising service case to support Web service composition.The method of Web service composition proposed in this paper is proved to be feasible and effective by examinations.

A QoS Driven Web Service Composition Method Based on ESGA (Elitist Selection Genetic Algorithm) with an Improved Initial Population Selection Strategy

With more and more web services being applied, the quality of service (QoS) becomes an important criterion in a service selection. We propose a UDDI process with QoS extension to support quality requests. Service providers can send functional and QoS information to the UDDI registry. As a component of the UDDI registry, the QoS calculator calculates the QoS value of each service to decide the optimal service and send the information back to the UDDI registry. After receiving the requestor's feedback, the QoS calculator re-calculates QoS of the service. In a service composition, component services and the composed service should satisfy local and global restrictions respectively. The QoS of component services aggregate to QoS of the composed service according to an aggregation rule. The QoS parameters may conflict with each other, so this problem is actually a multi-objective optimization. A service selection can be seen as a path formation and each node of the path is a service class. A genetic algorithm can be used to solve complicated global optimization problems. It is proved that a simplex genetic algorithm cannot converge to optimal global solution but the elitist selection genetic algorithm (ESGA) can. So we use ESGA to solve this problem. We use integer encoding as the encoding rule. A composed service can be seen as a chromosome and a gene is an integer that represents a service number in its service class. We use an initial population selection strategy instead of the random initial population creation method. In the strategy, if the fitness of a new composed service is worse than the average fitness of the selected composed services, it should be abandoned, otherwise it should be kept. We coordinate these objectives by assigning a weight to each parameter and the fitness function is the weighted sum of QoS parameters. In the stage of genetic operation, the penalty function is subtracted from the fitness of the composed service if it does not satisfy the restrictions. We use the roulette wheel selection method, single point crossover operator, and uniform mutation operator as genetic operators. It is shown that this method has better performance than the method using ESGA through an experiment.

Service Relationship Ontology-Based Web Services Creation

PDF HTML阅读 XML下载 导出引用 引用提醒 基于服务关系本体的服务生成 DOI: 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: Supported by the National Natural Science Foundation of China under Grant No.60432010(国家自然科学基金),the National Basic Research Program of China under Grant No.2007CB307100(国家重点基础研究发展计划(973)) Service Relationship Ontology-Based Web Services Creation Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:针对服务组合过程中生成复杂业务所涉及的用户个性化、动态生成等问题,提出了一种基于服务关系本体的交互式服务生成方法.该方法从3个视点对服务的关系进行分析,构建了服务关系本体,进而在服务生成中,通过挖掘服务的动态语义,获取用户意图,结合服务关系本体以引导后继服务的匹配.该方法可以灵活地适应用户及业务提供者的需求变化,获得较优的服务匹配结果,同时还提高了服务组合的效率.最后,实现并给出了支持该方法的原型系统以及实验结果,表明了该方法的可行性与有效性. Abstract:This paper proposes an interactive and dynamic method—service relationship ontology-based Web service composition method (SROCM). SROCM analyzes the services relationship from three-aspects, presents a method for building the services relationship ontology (SRO). In the composition, SROCM mines the dynamic semantic of services to achieve the interests of users and gets recommend subsequence services by SRO. The semi-automatically method can get an optimized service matchmaking result, adapt for variety of requirements of both customers and service providers flexibly, and ensure efficiency while composing service. The preliminary experiments show that this method can provide excellent subsequent service according to user's interests, and it is feasible and effective in dynamic service composition. 参考文献 相似文献 引证文献

The effects of alliance information on Web service composition

Web service composition (WSC) has emerged as a promising approach to integrating business applications within and across organizational boundaries. One of the major objectives of WSC research is to improve the performance of composite Web services. To this end, alliance information between different services partners has great potential, but has been overlooked by extant approaches to composing Web services. To address the above limitation, we propose an alliance-aware method for WSC in this paper, which incorporates the alliance information in constructing Web services. In addition, we adopt a multi-agent architecture to model and evaluate methods for WSC. Our experiment results reveal a significant impact of alliance information on the performance of WSC. We believe our findings on WSC are important to both WSC researchers and practitioners.

Special Issue on Web Services Practices

Special Issue on Web Services Practices