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As more and more cloud services are provided on the web, composite services will increase exponentially. How to select the optimal services for a given composite service is a important problem and is NP-Hard. This paper proposes a multi-objective service selection algorithm based on MOACS(Multi-Objective Ant Colony System) optimization algorithm for this problem. In this problem, two objectives are...
Aiming at the problem of service performance modelling, this paper uses ANN to establish the mapping relationships between virtual machine resource status and cloud service performance, and proposes an I-ABC-ELM method to train ANN. For the stability problems of the ELM training, this paper proposes the use of I-ABC algorithm to optimize the input layer weight matrix and hidden layer bias in ELM....
Reselection of composition service is one of the core research issues in the service computing field. Most of the existin-g researches for this problem are based on the assumption that the tasks involved are independent. However, in practical scenar-ios, the QoS of some candidate services have correlations with other services, which makes the corresponding tasks be correlated with each other. This...
With the increase of the number of web services on the Internet, QoS driven service selection as an important way to satisfy user's constraint on quality and maintain the runtime performance of services, has received much attention. The existing QoS driven service selection approaches always assume that the estimated QoS data is effective and trustworthy, which is actually impossible in reality. This...
More and more Web services are emerging in the Internet with development of service computing over the past decade. The web service in SOA system naturally forms into some service community during execution process. Mining and analysis Web service community will help design SOA system and support Web service application effectively. This article addresses the problem of how to discovering Web services...
Constructing optimal event correlation architecture is crucial to large-scale event services. It plays an instrumental role in detecting composite events requested by different subscribers in scalable and timely manner. However, events generated from different sources might have different time and priority requirements. In addition, the network links and correlation servers might have different bandwidth...
The efficient authorization is the precondition of implementing access control. Traditional access control technology which lacks dynamic authorization mechanism focuses on the beforehand authorization process. Based on usage control (UCON) which is new access control technology, this paper proposes a role-based dynamic authorization model. This model extends RBAC by introducing elements of UCON such...
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...
To objectively assess quality of Web services, we propose a six-dimensional QoWS framework which includes expected QoWS, agreed QoWS, delivered QoWS, perceived QoWS, transmitted QoWS, and statistic QoWS. Then a new style Web services assessment model is presented. It consists of SLA (service level agreement) register module, monitor module and assess module. Agreed QoWS is described in SLA and declared...
We propose a six dimensional QoWS model including expected QoWS, agreed QoWS, delivered QoWS, perceived QoWS, transmitted QoWS, and statistic QoWS to assess quality of Web services comprehensively and objectively. Meanwhile, the proposed assessment mechanism evaluates Web services from the view of compliance, end-to-end performance, and long-term performance.
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