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Adaptive service configuration approach for quality of service management in ubiquitous computing environments

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第7期10卷 964-975页

作者： Yong ZHANG Shen-sheng ZHANG Song-qiao HAN Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Mobility and resource-limitedness pose challenging issues to service configuration for quality of service (QoS) management in ubiquitous computing environments. Previous configuration approaches, such as static resource reservation, dynamic resource allocation and single service composition are not valid in the environments. In this study, we present an adaptive service configuration approach. Firstly, we reduce the dynamic configuration process to a control model which aims to achieve the variation of critical QoS on minimal level with less resource cost. Secondly, to deal with different QoS variations, we design two configuration strategies—service chain reconfiguration and QoS parameter adjustment—and implement them based on fuzzy logic control theory. Finally, a configuration algorithm is developed to flexibly employ the two configuration strategies in tune with the error of critical QoS in configuration process. The results of simulation experiments suggest that our approach outper- forms existing configuration approaches in both QoS improvement and resource utilization.

关键词： service configuration Ubiquitous computing (UbiComp) Quality of service (QoS) Fuzzy logic control

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Ship Size and service configuration in Container Shipping

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Journal of Southwest Jiaotong University(English Edition) 2009年第1期17卷 72-79页

作者：徐骅金凤君 Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences

This study analyzes the effect of ship size on the liner service configuration by establishing an economic model. The service configuration is characterized by the distance of service and the number of calling ports. A study ease is presented for illustration. At last such a conclusion is drawn that given a fixed profit, the ship size will change with the extension of service in the same direction, while the change rate of ship size is a little higher than that of the extension of service.

关键词： Container shipping service configuration Marginal product of distance Marginal product of port number

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