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김윤복(Yoon-Bok Kim),송성호(Sung-Ho Song) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.2
The paper considers the electrical shock risk of the human body due to underwater leakage current in electric field. The characteristics of electric shock in fresh water due to the leakage of submerged electric facility in the bathtub in public baths were conducted. The exposed live electrode is modeled as a point source of electric current source. It is assumed that divergent monopole field exists in the vicinity of the current source, regardless of the presence of return electrode and insulating boundary. Diesen and Mole equations are measured according to the distance from leakage source. The results show that the increased shock risk and safe distance are estimated by the bathtub of limited width and the voltage calculated on the basis of a divergent monopole field concept is compared with the measured value.
김윤복(Yoon -Bok Kim) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.4
This paper is purposed to analyze current and voltage waveforms and thermal characteristic for poor contact of electrical connector(breaker load connector). In this paper, current and voltage waveforms by loads(lamp, drill and electric heater) and thermal data by poor contact are analyzed distinguishing data for normal state. The current and voltage waveforms can not easily distinguish between poor contact and normal state. Thermal characteristic without vibration is generated thermal energy different then normal state and after 20 minute, breaker load connector is generated high thermal energy of over 210℃. Therefore, the poor contact data are referred and applied by poor contact basic data of current and voltage waveforms and thermal data.
김윤호(Yoon-Ho Kim),김윤복(Yun-Bok Kim),류홍우(Hong-Woo Ryu),김찬기(Chan-Ki Kim) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
MCT는 MOS-게이트형 사이리스터로써 MOS-게이트형 턴-온 및 턴-오프 특성과 낮은 도통전압을 나타내는 소자이다. 그러나 SOA(Safe Operation Area)가 상대적으로 작기 때문에 스너버 회로를 필요로 한다. 본 논문에서는 간단한 MCT PSPICE 모델을 사용하여 스위칭 특성과 RCD 스너버의 특성을 분석하였고 스너버 회로 설계방식을 제안하였다.
소프트 스위칭 보조 스위치를 가지는 ZVT-PWM 부스트 컨버터
김윤호(Yoon Ho Kim),김윤복(Yun Bok Kim),정재웅(Jai Woong Jeong) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper presents a soft-switching average current control PWM high power factor boost converter. Conventional boost ZVT-PWM converter has a disadvantage of hard-switching for auxiliary switch at turn-off A soft switched auxiliary switch is proposed to achieve a !ugh performance ZVT - PWM boost rectifier. The simulation and experimental results show that soft switching operation can be maintained for wide line and load range, which in turn improves the converter performance in terms of efficiency, switching noise and circuit reliability.<br/> <br/>
초등학교 저학년과 미취학 아동을 위한 로봇 활용 교수ㆍ학습 프로그램 개발에 관한 연구
김동연(Kim, Dong Yeon),김윤복(Kim, Yoon Bok),박정호(Park, Jung Ho),김진수(Kim, Jin Soo) 한국실과교육학회 2007 한국실과교육학회지 Vol.20 No.2
This research is thing about teaching·learning program development which using robot to elementary school lower classes (1, 2, 3 years) and preschool(6, 7 age) child(K-3rd graders). That is, robot specialist, machine specialist, electricity electron specialist, design specialist, education and environment specialists develop(2004-2006) research about 3 years. Main contents of this research are as follows. First, study straight and rear guard teaching·learning program that using robot. Second, that using robot fixing from right left teaching·learning program study. Third, study draw a diagram teaching·learning program that using robot. Fourth, study application teaching·learning program that using robot. Fifth, study English word teaching·learning program that using robot. Sixth, study Chinese character teaching·learning program that using robot. Together, consider enough affective domain, cognitive domain, psychomotor domain that is elementary school lower classes and each domain special quality of preschool children in this research, study and developed teaching·learning program which utilize robot and robot. Therefore, investigators expect that this research contributes greatly in elementary school lower classes students robot education activation.
0.06㎜이하의 권선 적용이 가능한 자동 권선 장치 개발
김두현 ( Doo Hyun Kim ),황동규 ( Dong Kyu Hwang ),김윤복 ( Yoon Bok Kim ),김상렬 ( Sang Ryull Kim ) 충북대학교 산업과학기술연구소 2011 산업과학기술연구 논문집 Vol.25 No.1
This paper is purposed to develop an auto winding machine which can regulate electrical resistance and thermal characteristics at winding coil. In order to develop auto winding machine, reference resistance value is investigated at the winding coil products produced in Korea. Through electrical resistance experiment of winding coil, auto winding machine needed improvement of tension spring and changed case body, X-Y-Z axis, A and B holders of tension device. Improvement auto winding machine analyzed electrical resistance and thermal characteristics of winding coil produced at a manufacturing plant and was suitable for this study on electrical resistance and thermal characteristic values. Results of improvement auto winding machine is suitable products of winding coil below 0.06㎜.
LabVIEW를 이용한 전기설비 이상신호 분석방법 연구
송성호(Sung-Ho Song),김윤복(Yoon-Bok Kim) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.2
This paper is purposed to develop monitoring program and DB and to select oscilloscope 3054B of Tektronix comp., which can be used in developing electrical equipment, to analyze and detect the abnormal signals. In this paper, the monitoring program which can interface with oscilloscope GPIB communication protocol, is embodied by LabVIEW. The combined oscilloscope and LabVIEW program are developed to analyze well at the same time on electrical signals such as RMS value, instantaneous value of current and voltage, FFT, DWT signals etc, and to measure abnormal signals on the electrical wires. Also, DB system is constructed for recording and comparing abnormal fault signal appearances by the time, month and year additionally. Verification experiment was conducted to evaluate usefulness and availability of the schemes in this paper. Results show that oscilloscope and LabVIEW program suggested in this paper are valuable and usable in developing electrical equipment abnormal signals at low cost and the same time.