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단축 추적식 태양광발전시스템에서 저집광 기술적용에 관한 연구
정경열(Kyung-Yul Chung),이창희(Chang-Hee Lee),김용식(Yong-Sik Kim) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
This paper aims at enhancing the electric production efficiency of photovoltaic(PV) system. The electrical power of PV system is proportional to light intensity on a PV module surface. In this paper, we apply two types of systems to enhance power generation efficiency. First of all, concentring sunlight using specular surface and one-axis tracking system which traces the sun with vertical direction are applied in this project. From this, we analyze the fixed type method and power generation efficiency.
배전선 활선감시 무인로봇용 다채널 모터 엔코더 모듈 개발
정경열(Kyung-Yul Chung),채정훈(Jeong-Hoon Chae),최대석(Dae-Seok Choi),김상열(Sang-Yeol Kim) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
This paper describes development results of the multichannel motor encoder module for power cable diagnosis using hight density field programmable gate arrays. (FPGA). Unmanned robot is composed of various different motor which is done by PWM(Pulse Width Modulation). In this proposed system, investigates the design and implementation of the FPGA chip for the speed control of an DC motor using VHDL which is a standard hardware description language.
정경열(Kyung-Yul Chung),김병덕(Byung-Duk Kim),류석현(Suk-Hyun Ryu),오상훈(Sang-Hoon Oh) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
This paper was written to develop diagnosis technique and a data acquisition method of an AOV actuator performance for a purpose to solve a problem of AOVs and accessories in the domestic power plants. as a result, we confirmed that an AOV actuator was correctly designed and executed, and performed calibration of an AOV actuator with signature analysis.
정경열(Kyung-Yul Chung),전우석(Woo-Seok Jeon),최대석(Dae-Seok Choi) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
In this paper, we design multi thread model for the PCB laser marking machine. Thread creation isn't cheap and creating too many threads can cause overhead. The thread pool solves that by having a pool of threads which have already been created.
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.
전력기기 집중감시용 고출력 무선센서네트워크 중계노드 개발에 과한 연구
정경열(Kyung-Yul Chung),이후락(Hoo-Rock Lee),장경선(Kyoung-Son Jhang),류길수(Keel-Soo Rhyu) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
In condition surveillance system for electric power equipments, applications based on wireless sensor are necessary to maintain the systems efficiently. Therefore, we need suitable wireless sensor network topology for the electric power equipment surveillance system. We assume that bridge node has enough power resources. In this paper, we present wireless sensor network bridge node for fixed cluster heads environment.
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.
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.
분산이벤트 기반 센서네트워크 패킷 라우팅 프로토콜 시뮬레이션
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.-
Simulation and physical implementation are both valuable tools in evaluating sensor network routing protocols, but neither alone is sufficient. In this paper, we present the implementation and analysis of sensor routing protocols on the discrete-event simulation system that allows existing nesC codes of sensor network routing protocols to be used to create a physical implementation of the same protocol. We have evaluated the Surge function of TinyOS through example implementations in the Ptolemy Ⅱ of the unmodified codes and Direct-diffusion routing protocols using VIPTOS simulation models.
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.