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Articles by Shuai Zhang
Total Records ( 4 ) for Shuai Zhang
  Keting Yin , Bo Zhou , Shuai Zhang , Honghong Jiang and Jerry Cristoforo
  In this study, we research on QoS-aware services selection for web service composition in multi-network environment. We revise the web service QoS (Quality of Service) model and propose a service selection approach based on Integer Programming (IP) to meet new requirements in multi-network environment. Compared with traditional approaches, experimental results show that our approach can achieve a better solution with acceptable performance cost.
  Honghong Jiang , Xiaohu Yang , Keting Yin , Shuai Zhang and Jerry A. Cristoforo
  In this study, we proposed to adopt a variable length chromosome Genetic Algorithm (GA) for handling QoS-aware service composition among multiple paths (multi-path) problem. Our approach uses variable length chromosomes to represent composited services in multiple paths and conducts the gene crossover operation based on service parameters matching. The scalability of the algorithm is analyzed theoretically and its effectiveness is demonstrated by experimental results.
  Shuai Zhang , Jianling Sun , Yuanhong Shen , Yixi Chen and Aleksander J. Kavs
  Many approaches have been proposed for performance optimization of centralized services composition. However, with the prevalence of web services, services orchestration evolves from intra-enterprise integration to cross-enterprise integration and involves multiple networks. In such environment, the centralized orchestration suffers from several performance and reliability issues due to the limitation of centralized execution engine and the network conditions. In this paper, we try to optimize the performance of composite services in enterprise environment by adjusting the deployment location of component services. First, we propose a decentralized orchestration model for multiple networks environment. Based on this model, we propose the concept called service interaction strength, which is denoted by the data interaction between component services in a composite service as well as the importance of composite service itself. Then we design an objective function for all composition services with overall minimum cross domains service interaction costs and thus reduce the response latency and increase the performance of composite services. At last we introduce a mixed repair genetic algorithm to get the optimized deployment plans for all component services. Experimental results on simulation prototype show the optimization effectiveness of our approach and the performance of algorithm itself is also acceptable.
  Hai quan Zhang , Wen ke Liu , An lei Qin , Fei fei Wang , Li cheng Zhao , Shuai Zhang , Ying Li and Huai Yang
  A novel series of chiral dopants synthesised from (S)-1, 2-propanediol and mesogenic carboxylic acids were characterised by Fourier transform infrared and 1H nuclear magnetic resonance, and their helical twisting properties were investigated by doping the chiral dopants into a nematic liquid crystal host (SLC-1717). The results showed that the values of the molecular twisting power β were significantly dependent on the nature of the terminal substituents, terminal alkyl length and numbers of chiral centres in the molecular structure. Compared to compounds with electron-with-drawing groups (-NO2, -F, -CF3), the chiral compounds with terminal alkyl chains exhibited a higher β.
 
 
 
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