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Issue 12, Volume 4, December 2007
Print ISSN: 1109-9526
E-ISSN: 2224-2899








Title of the Paper:  Design and Practice of the Interworking System of the Heterogeneous-VoIP


Authors: Chih-Chang Shen, Tung-Ming Koo,Bo-Lin Kuo

Abstract: At present, the VoIP is a fashion application of Internet. However, because they cannot communicate each other among various protocols of VoIP, it is necessary to install the VoIP-application for that specific group if these users having different VoIP protocols wish to communicate. For interworking between different VoIP groups, the two major players of the instant message, Yahoo Messenger and MSN Messenger, have provided an integration project. Thus, the interworking of the heterogeneous-VoIP has become a trend. Besides, the VoIP users can be classified into two groups, SIP and Skype. Therefore, to communicate both groups of users, SIP and Skype, a connection system of the heterogeneous-VoIP with a man-in-the-middle mechanism is provided and practiced in this study.

Keywords: P2P, VoIP, SKYPE, SIP, Heterogeneity, Man-in-the-Middle

Title of the Paper: To Support Stable Service by Centre Clustering Mechanism
in Mobile Ad-hoc Network


Authors: Shu-Ching Wang, Hsin-Hung Pan, Kuo-Qin Yan, Yu-Lung Lo

Abstract: In recent years, people are more reliant on wireless network services in order to obtain latest information at anytime, anywhere. For wireless networks, the allowance of several mobile devices to send data among one another effectively has become an important research topic. In this paper, a mechanism for the designation of clustering and cluster manager is given by mobile Ad-hoc network. The proposed mechanism adopts the center manager to improve the stability of network topology, assists Mobile Host within the working area, and takes advantage of message exchange.

Keywords: Mobile ad-hoc network, Center-based, Hierarchical manage, Manager selection

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