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신뢰성 있는 멀티캐스트를 이용한 음성 회의 시스템의 설계
송기평(Ki Pyung Song),구경철(Kyung Chul Gu),박치항(Chi Hang Park),김광현(Gwang Hyun Kim),이태훈(Tae Hoon Lee) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.5
Multicast is the multiparty communication that allows one-to-many communications. There are some multicast applications which are the ways of multiparty communications such as video conference system and white board. This paper proposes a dynamic allocation mechanism of designated receiver by using designated receiver list and a retransmission mechanism with designated receiver for the effective multicasting data transmission. We designed voice conference system with multicast based on RTP/RTCP. This voice conference system increases the effect of standardization work and enables to exchange reliable standard data with real time.
가교폴리에틸렌(XLPE)의 부분방전에 의한 초음파 검출
김성규(Seung-Gyu Kim),이상우(Sang-Woo Lee),구경철(Kyung-Chul Gu),김충년(Chung-Nyen Kim),김인식(In-Sik Kim),이광식(Kwang-Sik Lee),이동인(Dong-In Lee) 한국조명·전기설비학회 1999 한국조명·전기설비학회 학술대회논문집 Vol.1999 No.-
Measurements of AE signals caused by partial discharges were performed by using an ultrasonic measurement technique to diagnosis the electrical treeing deterioration in XLPE cable. We also examined the partial discharge magnitude and AE signals(peak-to-peak) with the increase of the deterioration time. From these results, it was found that AE signal due to partial discharge can be greatly detected at the peak value of positive polarities prior to the breakdown voltages, and the magnitude of AE signals was closely related to the current pulses by the increase of deterioration, and it appeared that AE signals(peak-to-peak) was proportional to partial discharge magnitude. Attenuation and time-delaying characteristics of ultrasonic signals propagated in various polymers sample by using ultrasonic oscillation and receiving systems are also reported as a basic data of ultrasonic measurements in XLPE cable.