Tiejiang Liu

Agent-Based Online Quality Measurement Approach in Cloud Computing Environment

This paper studies online quality measurement in cloud computing environment. The paper analyzes concentration measure evaluation method of the current software quality evaluation system. As is known to all, the existing evaluation technology uses concentrated evaluation before run-time. By testing and analyzing results, the quality is obtained. In this paper, by analyzing the features in cloud computing environment, we consider that service-oriented evaluation should be mainly based on runtime online measurement. The paper puts forward agent-based online measure infrastructure, which is evaluated by distributed assessment in service computing environment A quality model and corresponding online data collection strategy are described. In this approach, the previous quality evaluation, which is concentrated and simulating in a simulated environment, is substituted. Then, a novel measure method of quality data acquisition, which is based on distributed agent technology, is established. So, during online service operation, the obtained data can make measurement results to be accurate and credible.

Mobi-CoSWAC: an access control approach for collaborative scientific workflow in mobile environment

With the development of mobile technology and popularity of pervasive applications, more and more scientific collaborative research works are carried out in the wild or on the move. How to make an optimal tradeoff between deep collaboration and strict access control in mobile environments is a challenging work. In this paper, we propose Mobi-CoSWAC, an access control approach for collaborative scientific workflow in mobile environments. In our approach, ranked access permissions will be provided to users for continuous collaboration in disconnected settings, as well as the owned access permissions can be dynamically assigned according to the roles evolution in various mobile contexts. The model and access control algorithms of Mobi-CoSWAC are elaborated and a prototype is implemented on Android mobile devices in collaborative proteomics research platform CoPExplorer to demonstrate its effectiveness.

Test coverage for collaborative workflow application based on Petri Net

Lots of collaborative works are developed by workflow at present. The modeling of workflow is mainly by Petri Net. This paper studies the test coverage of collaborative workflow system to improve the system quality. By analyzing many Petri-Net models, the paper puts forward generic advance Petri Net model. And other workflow Petri Net models can be compatible with the generic Petri Net. Then test coverage strategy is considered and test case is designed according to the strategy. This method not only can meet the requirement of test coverage, but also can assist test case design and further execution of test case. Finally, a typical example is introduced to illustrate effectiveness of this method in collaborative workflow application.

Service deployment optimization oriented collaborative dynamic double buffer pool in clouds

In a cloud computing environment, a great amount of services require to be deployed into the cloud, which may lead to the redundancy and complexity of cloud-services, and ever-increasing resource consumption. Current researches try to optimize the increasing number of services with the support of buffer pool and deployment optimization algorithms. Buffer pool here performs the crucial task of storing the deployment requirements for optimization. However, issues like when to enforce the flush and which stored objects should be flushed out still lack comprehensive consideration. To address these problems, we propose an improved collaborative dynamic double buffer pool in this paper. By classifying different deployment requirements and flush fashions, we select a threshold to determine when to enforce the flush. According to this flush time, we can select the to-be-optimized objects dynamically along with necessary collaborative interaction with the service owner. Meanwhile we present the algorithms of the buffer pool flush mechanism, and the improved service deployment optimization approach. In the end, we illustrate the effectiveness and feasibility of our approach through a demonstration which guarantees relatively high optimization efficiency.

A Novel Web Service Selection Based on Dynamic Quality Evaluation

This paper proposes a novel method of Web service selection for the better quality based on environment of dynamic evaluating system. The evaluating system considered the end-user for the quality of service. This QoS evaluation framework which carries out a dynamic method of acquiring the quality data in the Web service composition based on the end-user feeling of web services. The procedure of processing the quality of service is extended quality of single service to multiple factor. Considering the end-users perception, the distribution of dynamic evaluation can greatly improve the quality of Web service and its composition, which is not just adjusted according to end-users requirements. A novel service selected algorithm with QoS is also presented in the paper, which chooses the different composition execute path to get optimized quality. Some experiments are illustrated to demonstrate effective.