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Workspace measuring and positioning system (wMPS) is a kind of large-scale and multi-station intersection system, of which the station layout optimization is a common but important problem. Station optimal topological geometry based on genetic algorithm was proposed in this paper. Firstly, the positioning error, coverage area and cost were taken as objectives to establish the multi-objective optimization function. Secondly, genetic algorithm optimization process was established according to multi-objective function. Thirdly, simulation analysis for layout optimization algorithm of 2-4 stations was performed. The results show that the proposed method is able to quickly converge to optimal solutions, have good adaptability and improve wMPS measuring performance as well.

With the gradual development and standardization of services-oriented computing (SOC), it becomes a rapidly growing software developing pattern to composition Web services into applications. Since Web services composition are long-lasting, loosely coupled and cross application and administrative boundaries, it is essential to choose proper services to compose the composite Web services to meet user’s requirements. This paper presents a QoS evaluation method for aggregation services when failure occurs and defines QoS evaluation model of the common aggregation patterns of transaction compensation. Experiment results show that when it is used to evaluate the QoS of composite Web services, QoS evaluation method of aggregation transaction compensation is much better than the Web services composition method based on random selection, and it is feasible and effective.

Web Services Composition (WSC)-based applications are widely using in the heterogeneous environment, which has inevitably led to the need for reliable methods for the WSC paradigm. This paper presents a formal definition of Web services composition, and then analyzes task dependency rules of dataflow and behavior in Web services composition net system, finally, we introduce execution semantic of Web services composition net.

Web Services Composition (WSC)-based applications are widely using in the heterogeneous environment, which has inevitably led to the need for reliable methods for the WSC paradigm Firstly this paper presents formal description of Web service and then proposes a novel WSC compensation method based on paired net which can dynamically construct agile compensation business process according to original business process and implements it. Secondly, we introduce a formal definition of execution logs, which ensures the reliability and consistency of composition execution. Finally, Composition-based application of trip reservation process shows that it is feasible.