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An Optimized Hierarchical Handoff Method with Mobile IP and SIP
Kai Zhang(장개),Ji-Gong(공길),Yoonhwan Park(박윤환),Kisung Yu(유기성),Gihwan Cho(조기환) 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.1
In the 4 generation(4G) wireless network, mobility management can be effectively achieved by applying Mobile IP(MIP) and the Session Initiation Protocol(SIP) in cooperatively. However, an important and challenging issue is the handoff management in this architecture. In this paper, we present an optimized handoff method with MIP and SIP. Two mechanisms are proposed to resolve micro-mobility, along with same domain mobility. Micro-mobility handoff manages movements in the one area, while same domain mobility handoff manages movements between two neighboring are as. This method makes use of a retransmission for micro-mobility, and multicasting to re-establish a traffic flow for same domain mobility.
장개 ( Kai Zhang ),박재복 ( Jaebok Park ),박윤환 ( Yoonhwan Park ),조기환 ( Gihwan Cho ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.2
본 논문은 저비용 센서네트워크를 이용하여 효율적으로 산불을 감시할 수 있는 시스템설계 방법을 제안한다. 제안된 산불감시시스템은 기존의 문제점들을 보안하여 정확한 산불 감지를 위해 여러 센서들을 사용하고, 추가적으로 정확성을 의해 카메라모듈을 이용하여 산불을 감지한다. 따라서 본 논문은 산불감시를 위한 센서의 선택방법과 저전력을 고려하여 센서노드와 카메라모듈의 설계방안을 제시한다. 마지막으로 산불감시시스템의 효율적인 데이터 전달을 위한 프로토콜을 제안한다.
An Energy and Coverage Efficient Clustering Method for Wireless Sensor Network
공지(Ji Gong),장개(Kai Zhang),김승해(SeungHae Kim),조기환(Gihwan Cho) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.1
Due to technological advances, the manufacturing of small and low cost of sensors becomes technically and economically feasible. In recent years, an increasing interest in using Wireless Sensor Network (WSN) in various applications, including large scale environment monitoring, battle field surveillance, security management and location tracking. In these applications, hundreds of sensor nodes are left to be unattended to report monitored data to users. Since sensor nodes are placed randomly and sometimes are deployed in underwater. It is impossible to replace batteries often when batteries run out. Therefore, reducing energy consumption is the most important design consideration for sensor networks.