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정경열(Kyung-Yul Chung),이후락(Hoo-Rock Lee),한정은(Jeong-Eun Han),김상열(Sang-Yeol Kim) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
In this study, corona discharge may occurs in power transmission lines and power devices and it could deteriorate that. In the earth, it is solar-blind bandwidth exist. So, It can possible to detecting the corona discharge in day-time through the 230㎚-280㎚ wave length. In this point, we did researching the solar-blind bandwidth camera through the image processing technology.
지중배전 열화진단을 위한 무선센서 네트워크에 관한 연구
정경열(Kyung-Yul Chung),이후락(Hoo-Rock Lee),최대석(Dae-Seok Choi),김용식(Yong-Sik Kim),이수태(Soo-Tae Lee),류길수(Keel-Soo Rhyu) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
In this paper, method of a simple wireless sensor network for detecting and locating faults as well as for underground cable monitoring are presented. The main novelty of the concept is in source based routing network characteristics on system level with low power hardware. This method enables the underground electrical distribution system monitoring to be simple.
기술현황분석 - EBP 알고리즘을 이용한 부분방전 패턴인식 기술 개발에 관한 연구
정경열,이후락,한정은,박정태,장경선,김용식,Jeong, Gyeong-Yeol,Lee, Hu-Rak,Han, Jeong-Eun,Park, Jeong-Tae,Jang, Gyeong-Seon,Kim, Yong-Sik 재료연구소 2009 機械와 材料 Vol.21 No.3
전력기기에서 발생하는 부분방전을 정확히 측정하고 이를 올바르게 해석하는 작업은 신뢰성 있는 진단법을 개발하고 이를 현장에 적용하는데 있어 대단히 중요하다. 측정된 고주파 데이터를 패턴 분석이 가능한 형태로 가공하는 전처리 과정을 수행하고, 가공된 데이터를 패턴인식을 통하여 기존의 각 노이즈 및 부분방전 패턴과 비교하여 실제 측정된 데이터가 어떤 부분방전 패턴인지 판단한다. 패턴 인식 처리 방법으로는 컴퓨터 분야 신경회로망의 BP 알고리즘과 SOM 알고리즘이 널리 사용되고 있으며 본 연구에서는 TF-MAP, PRPDA, EBP 알고리즘을 이용하여 부분방전 패턴인식 기술 개발에 관한 연구를 수행하였다.
고압 지중 XLPE케이블의 TF-MAP 해석을 이용한 PD와 잡음의 분류
정경열(kyung-Yul Chung),박정태(Jung-Tae Park),장경선(Kyoung-Son Jhang),김용식(Young-Sik Kim),최대석(Dae-Suk Choi),이수태(Soo-Tae Lee),이후락(Hoo-Rock Lee) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
The application of PD Monitoring System in real space needed to considerate of noise reduction. but, A limit of the noise reduction exist in some filters. Therefore, TFMAP impelemented to reduce noise for classification of PD and noise. This paper showed noise reduction effect of TFMAP in experiment.
코로나방전 감시를 위한 계층적 무선센서네트워크 라우팅 알고리즘 최적화 연구
정경열(Kyung-yul Chung),박창대(Chang-dae Park),임병주(Byung-ju Lim),이후락(Hoo-rock Lee),심상용(Sang-yang Sim),김용환(Yong-hwan Kim),류길수(Keel-soo Rhyu) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
For the electric corona discharge surveillance network for electric power equipments, we found a suitable routing algorithm for the wireless sensor networks. It is the LEACH-C(Low Energy Adaptive Clustering Hierarchy-Centralized) routing algorithm which is centralized cluster formation method of LEACH.
코로나 방전영상 검출을 위한 Dual DSP 기반 크로마키 영상합성에 관한 연구
정경열(Kyung-yul Chung),임재우(Jae-woo Lim),박창대(Chang-dae Park),임병주(Byung-ju Lim),이후락(Hoo-rock Lee),강성원(Sung-won Kang),홍진기(Jin-ki Hong),이창희(Chang-hee Lee),김용식(Young-sik Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In order to diagnosis invisible corona discharge, overlay method has been used with UV band and visible band video display. In this paper, in order to confirm position of corona discharge through detecting UV band of 230~280㎚ wavelength, two high efficient DSP and Linux program with embedded system to operate DSP have been used. We used chromakey compositing method to combine UV band and visible band video display.
PV모듈에서 태양전지의 출력 불균일에 따른 직병렬 회로의 손실특성 분석
정경열(Kyung-Yul Chung),이진섭(Jin-Seob Lee),김용식(Yong-Sik Kim),이후락(Hoo-Rock Lee) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
The current and voltage of photovoJtaic module are determined according to serial-parallel circuit designs. The environmental, electrical and physical sources give effects on current-voltage mismatches of PV module and array. They also bring power loss and short-term durability. PV system could generate more power if we consider the mismatch of the system. In this paper, the electric characteristics and thermal phenomenon are deeply examined by counting current mismatch in serial circuit. On the other hand, parallel circuit is also examined for the electric and thermal characteristics due to voltage difference of the system.
코로나방전 진단을 위한 Embedded 네트워크 시스템 개발
정경열(Kyung-yul Chung),박창대(Chang-dae Park),임병주(Byung-ju Lim),이후락(Hoo-rock Lee),심상용(Sang-yong Sim),김용환(Yong-hwan Kim),류길수(Keel-soo Rhyu) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
In this paper, we proposed an embedded network system for the electric corona discharge surveillance. The proposed embedded network is possible to configure wired and wireless communication network by cluster units that is for more flexible and expandable. To verification, We have simulations and perform the test by build a small network.
센서네트워크에서의 클러스터헤드 기반 라우팅 확정 알고리즘에 관한 연구
정경열(Kyung-Yul Chung),이후락(Hoo-Rock Lee),오진규(Jin-Gyw Oh),최대석(Dae-Seok Choi),김용식(Yong-Sik Kim),이수태(Soo-Tae Lee),류길수(Keel-Soo Rhyu) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
In condition monitoring system for underground electrical distribution networks, applications based on wireless sensor are necessary to maintain the systems efficiently. Therefore, we need suitable routing determination algorithm and it's topology of wireless sensor networks. We assume that end nodes have tiny-power resources but cluster heads are not restricted power condition. In this paper, we present a simple routing determination algorithm for cluster topology and compare our algorithm, based on a cluster heads beacon mechanism, with previous by a discrete-event simulator.