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프로펠러와 부가추력장치를 갖는 특수선의 모델링/통합제어기 개발
이병결(Byung-Kyul Lee),임종옥(Jong-Ok Lim),임재권(Jae-Kwon Lim),임헌호(Heon-Ho Lim),김종화(Jong-Hwa Kim) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
Dynamic positioning(DP) system maintains its position (fixed location or predetermined track) exclusively by means of CPPs and thrusters. In order for a ship to cope with current situation appropriately. an integrated controller generating control signals for each CPP and thruster is required. The integrated controller including thrust calculation algorithm and thrust allocation algorithm is suggested and realized based on TCP/IP network.
이상훈(S. H. Lee),임헌호(H. H. LIM),박성준(S. J. Park),안진우(J W.Ahn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In a motor driving, the current rate is directly related to the rate of a switching device and in cost reduction, the parallel switching operation is the alternatives because It has the smaller current rate through current division There are many investigations for the parallel switching operations to equaling the current division However It remains many problems for practical usage The reason is that the switching characteristics are mainly relied on the different saturation voltage of each device etc. and these factors are not altered by a Circuit designer. In order to compensate this problem, a proper resistance is experimently inserted to the switching device. But this method can not be the optimal solution Therefore this paper proposes a new parallel operation which uses a parallel phase winding to remove the traditional effect of switching device such as saturation voltage according to the division of current Also the reliable and stable driving is improved through experiments and the detailed principles
Tethered Sonde와 Sodar 관측으로 분석한 광양만 지역의 풍환경 특성
이화운(Lee, Hwa-Woon),박순영(Park, Soon-Young),임헌호(Lim, Heon-Ho),김동혁(Kim, Dong-Hyuk),김민정(Kim, Min-Jung) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
When we urgently need to develop and supply an alternative energy, wind power is growing with much interest because it has relative low cost of power and area of tower. To estimate the wind power resource, it is necessary to make an wind resource map first. On the study of wind resource map in the Korean peninsula, Southern coast was needed to investigate the possibility of developing wind power complex because of good wind resources. In this study, we made a vertical observation to analyze the properties of wind in coastal area. From tethered sonde observation, we knew that synoptic effect had an influence higher in second day than first day. This means local wind circulation is generated on first day but not second day. The local wind made vertical wind shear strong in first day. Also, there was large difference of wind speed between layers at night time by analysis of SODAR observation.
확신도 기법을 적용한 선박엔진 고장진단 전문가시스템 구현에 관한 연구
정경열(K.Y.Chung),최욱현(W.H.Choi),임헌호(H.H.Lim),류길수(K.S.Rhyu) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
This paper presents the design and implementation of a diagnosis system incorporating with a monitoring system. We classified the ship engine into the sub parts as similarly a experts classification method, acquired the causal relation between measuring data and fault states in consultation with experts, constructed a rule-base using them, and adopted a certainty-factor method in order to handle uncertanties of evidences and rules. When alarms occur, the system infers diagnostic conclusion by using certainty factor obtained from an alarm state (one of 4 levels) and an alarm datum's trend (one of 3 levels), and the certainty factor of a related rule (one of 3 levels).
SRM 인버터의 병렬 스위칭을 위한 새로운 스위칭 패턴
이상훈(S. H. Lee),이상훈(S. H. Lee),정성우(S. W. Jung),임헌호(H. H. LIM),박성준(S. J. Park),안진우(J. W. Ahn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A SRM inverter has very low switching frequency, This results m reducing the burden for a high-speed of the gate-amp interface circuit. and the linearity of optocoupler is used to protect the intanteneous peak current for the stable operation<br/> In this paper, series resistor is used to equal the current sharing of each switching device and a linear gate-amp is proposed to protect the intanteneous peak current which occurs in transient state.
a-b-c frame에서 구현한 AC-DCconverter 전류제어기
조우성(Woo-Sung Cho),노의철(Eui-Cheol Noh),김인동(In-Dong Kim),전성즙(Seong-Jeub Jeon),박경훈(Kyung-Hun Park),임헌호(Hun-Ho Lim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A new current controller implemented in a-b-c frame for AC- DC converter is proposed.<br/> The proposed MTPWM(Modified Trapezoidal PWM),Which is quite suitable for three phase AC-DC converter. It is known that MTPWM has good harmonics characteristics for high modulation index. It is very simple and requires no transformation in it. The results of computer simulation are shown for the validity of proposal.
지하매설 및 해양 금속구조물 음극방식용 모듈 타입 스위칭 정류기
문상호(Sang-Ho Moon),김보경(Bo-Kyoung Kim),김인동(In-Dong Kim),노의철(Eui-Cheol Nho),권영원(Young-Won Kwon),정성우(Seong-Woo Jeong),임헌호(Heon-Ho Lim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
본 과제를 통해 금속 구조물 음극 방식용 고성능 스위칭 정류기를 개발하였다. 개발된 정류기 회로는 크게 두 부분, 즉 l 대로 구성된 AC/DC 컨버터부와 4대로 구성된 Module Type DC/DC 컨버터부로 되어 있다 AC/DC 컨버터는 IGBT PWM Rectifier 로서 입력전압의 역률을 거의 1로 제어하고 있으며 또한 DC Link 전압을 일정하게 제어하고 있다. Module Type DC/DC 컨버터는 ZCS/ZVS 스위칭 동작을 통하여 스위칭 손실 감소와 함께 고주파 동작을 가능하게 하여 , 입력측과 출력측의 전기적 절연을 위한 변압기로 고주파 변압기를 사용할 수 있게 하였다 이로 인해 시스템의 부피와 무게를 현저 히 감소시켰다 본 과제에서 개발한 방식용 정류기 기술 은 다른 유사 분야에의 적용도 가능한 것으로 사료된다.