|
|
| |
| 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. |
|
|
|
|
| |
|
