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강수경(Su-Kyung Kang),최인지(In-Ji Choi),박병석(Byung-Seok Park),박인수(In-Soo Park),이영훈(Young-Hun Lee),강철신(Cheoul-Shin Kang) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.9
As the AMR business expanded, It is necessary to understand the PLC characteristics of the site to build the entire AMI system. This paper deals with channel and noise characteristics in details from 2MHz to 30MHz based on the field tests over low voltage power line in Korea grid. And we analyze frequency which is measured by distance and consumer characteristics and suggest the direction of demonstration system for the AMI system. Finally we suggest that the coverage of power line communication is under 50m, and if the distance is over 50m, then it is necessary to use the repeater which amplifies the signal. And we found that noise characteristic is more related to the customer type rather than distance.
교량 모니터링을 위한 예약 기반 무선 센서 네트워크에 관한 연구
김경목(Kyung-Mok Kim),강철신(Cheoul-Shin Kang),오병주(Byung-Joo Oh),이영훈(Young-Hun Lee) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.6
This paper reviews the characteristics and applicability of WSN to monitor seismic and infrasonic signals from bridges. A sensor network deployment infrastructure that integrates to centralized data storage was proposed. This infrastructure was aimed to offer remote network monitoring, data management and maintenance. A simple and efficient reservation-based medium access control (MAC) protocol was developed for the proposed deployment. Using the network topology and parameters of the proposed sensor deployment, the performance of this MAC protocol was simulated in parallel with implementations similar to S-MAC and T-MAC. The simulation results indicated that the proposed MAC protocol performed better in terms of power usage and delay time.
서비스 품질을 제공하는 광버스트 구성을 위한 패킷 어셈블리 방식
이용규(Yong-Kyu Lee),강철신(Cheoul-Shin Kang) 한국정보기술학회 2004 한국정보기술학회논문지 Vol.2 No.1
In order to avoid the electronic speed bottleneck, new optical switches/routers have been built for the next-generation optical Internet backbone network. Also new approaches which are called Optical Burst Switching(OBS) are under research, which combine the advantages of Optical Circuit Switching and Optical Packet Switching. In this paper, we proposed a new burst assembly method, which provides QoS through the differentiated burst assembly that can be used in the Internet backbone network. A simulator is designed to measure the performance improvement of the proposed burst assembly method over existing burst assembly method. The simulator runs under mixed traffic environment of real-time traffic and non real-time traffic. An exhaustive simulation study have been carried out to compare the performance of the proposed burst assembly method to the existing burst assembly method. The simulation results show that the characteristic of real-time packets of the proposed QoS-support Burst Assembly(QBA) method is better than that of the General Burst Assembly(GBA) method which are used in most of existing routing systems.
가시광 통신 시스템을 위한 예약기반 MAC 프로토콜에 관한 연구
김경록(Gyeong-Mok Kim),김명종(Myeong-Jong Kim),강철신(Cheoul-Shin Kang) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.12
In-door visible light communication network is a star-topology network in which there are a number of nodes and a central point. In this paper various characteristics of the in-door visible light communication channels are discussed and a reservation-based MAC(medium access control) protocol is proposed which can be used in in-door visible light communication networks. Simulation model has been designed to measure and compare the performance characteristics of the proposed protocol to the existing MAC protocol. The simulation results show that the time delay and utilization characteristics of the proposed protocol are superior to those of the existing protocol.