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K-means as a clustering algorithm has been studied in intrusion detection. However, with the deficiency of global search ability it is not satisfactory. Particle swarm optimization (PSO) is one of the evolutionary computation techniques based on swarm intelligence, which has high global search ability. So K-means algorithm based on PSO (PSO-KM) is proposed(More)
Web service composition is a flexible way for resource sharing and application integration. However, how to guarantee quality of service composition remains a challenging problem. This paper proposes a heuristic approach to optimizing service selection for composition so that the user’s QoS expectation is satisfied. Optimization is enforced for(More)
This paper presents a method of detecting network anomalies by analyzing the abrupt change of time series data obtained from management information base (MIB) variables. The method applies the auto-regressive (AR) process to model the abrupt change of time series data, and performs sequential hypothesis test to detect the anomalies. With time correlation(More)
In the early service transactions, quality of service (QoS) information was published by service provider which was not always true and credible. For better verification the trust of the QoS information was provided by the Web service. In this paper, the factual QoS running data are collected by our WS-QoS measurement tool; based on these objectivity data,(More)
—As an important means to compose independent services together to fulfill a function, service composition is widely applied in different applications. However, the process of composition is complex and error-prone, which makes a formal modeling and analysis method highly desirable. A BPEL process based on Petri net (BPEL-Net) model is presented in this(More)
—As computer systems become increasingly internetworked, a challenging problem faced by researchers and developers of distributed real-time and embedded (DRE) systems is devising and implementing an effective shedulability strategy that can meet real-time requirements in varying operational conditions. In this paper, an extended Place-timed Petri nets(More)