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Articles by Chun Yan
Total Records ( 5 ) for Chun Yan
  Wei Liu , Yu Yue Du , Bao Qi Guo , Chun Yan and Qiang Xu
  Dynamic Description Logic (DDL) is an extension of description logic. In dynamic description logic, both services and the service composition can be expressed in formulae, but there is still much room to promote the efficiency. In this study, a fast and effective method for web service composition is proposed for the services which perform in sequence. This method takes advantage of the partial order relation among services, dividing the service composition into two phases:on the first stage, the partial order diagram is generated in the registration server; on the second stage, the fast algorithm is run based on the partial order diagram to return web service composition to meet requests of users. By analysis and verification, the fast algorithm for web service composition presented in this study can be implemented in a linear time complexity, greatly shortening response time of the system.
  Wei Liu , Yu-Yue Du and Chun Yan
  Service selection is an essential issue in service discovery based on Web service clusters. The ratio of trust value to price is introduced to select the most suitable service in a cluster. The method of computing the initial trust, the direct trust and the recommendation trust are, respectively presented and the overall trust is derived based on them. The proposed method keeps the balance between the price and service quality.
  Chun Yan , Wei Liu and Fang Li
  Analyzing on change factors of China open-end funds scale and founding economic model which can explain the size of the fund changing. Analyzing and forecasting changes on China open fund scale can provide decision-making basis for management and risk control of China open-end fund investment which will have very theoretical and realistic significance. This study on the external factors which effects the fund investment flows. Based on season serial data it found the error correction model to analysis the change of fund size by the example of the open-end stock equity mutual funds in China. This model extends the size of sample data. The results shows us there exists a long-term cointegration relationship among the fund scale changing Y, the net growth rate of the final fund share X1 and the percentage of the Shanghai index changing X2. It analyzes the long term equilibrium relationship and short term fluctuate forecast of the fund flows. From the coefficient estimation, we can see that the adjustment effort is large.
  Chun Yan , Yi-wei Qiu , Xin-min Liu and Wei Liu
  Research on differences of medical expenses in Qingdao could provide reference to take control of medical expenses reasonably. This study uses hierarchical cluster analysis of two variables, outpatient costs for each people and hospitalization expenses for each day of Qingdao in the first half of 2012. According to the medical cost, the 22 governmental hospitals in Qingdao are divided into four grades: "lowest cost", "lower cost", "higher cost", "highest cost". Then make the clustering results for significant test using the single factor variance, LSD method and S-N-K method. It shows that the four levels have obvious differences. Finally, the countermeasure for controlling medical expenses is put forward in Qingdao, China.
  Chun Yan , Xianghui Chen , Wei Liu and Yuan Tian
  This study argues that for importing the economical factor, introducing insurance mechanism into supervision of coal mining safety production can fully arouse enthusiasm of all parties, supervise and urge coal mining enterprise to increase the safety input, lower the probability of safety accidents in advance, after the accident increase the capital source of remedying lose in safety production and provide the more reasonable compensation for injured miners and their family. Game analysis on insurance companies intervention in coal worker safety supervision using the principal-agent model is done and many problems such as supervision dynamics, supervision cost and penalties in condition of information asymmetry is discussed. It is demonstrated in the sight of game theory that the differential rate and floating rate of coal worker safety insurance are necessary.
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