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PMG Type 디지털 AVR을 이용한 선박용 동기발전기 출력전압제어
유동환(Dong-Hwan Yu),박상훈(Sang-Hoon Park),유재성(Jae-Sung Yu),이상석(Sang-Suk Lee),김영렬(Young-Real Kim),원충연(Chung-Yuen Won) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
The output voltage of synchronous generator is regulated constantly by field current control in excitation system. Most of ship generator exciter system uses the thyristor phase controlled rectifier. However this rectifier is difficult to realize that the speed control system because its control period is slower than MOSFET and IGBT type converter. Therefore, this paper deals with PMG(Permanent Magnet Generator) type digital excitation system using MOSFET for ship synchronous generator. The organization of this excitation system is very simple. When the generator is under the short circuit accident, the output voltage becomes zero state and AVR can not operate. Thus generator requires the function for flowing output current through CBS. The performance of the proposed system is evaluated on a 10㎸A experimental prototype circuit in place of real ship generator.
퍼지제어기를 이용한 영구자석형 7상 브러시리스 직류전동기의 속도제어 성능개선
박상훈(Sang-Hoon Park),유동환(Dong-Hwan Yu),이희준(Hee-Jun Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
The 7-phase BLDC motor is possible for higher efficiency per the unit area, high power and high speed due to the increasing number of phase. Also, it can be looking forward to reduce the current ripple at a point of commutation by the increasing number of phase. Thus, a study for applications of servo system, medical and military instruments is progressing about the BLDC motor is manufactured with multi-phase, currently. This paper is used the fuzzy logic control method for speed control of 7-phase BLDC motor and this is compared with the conventional PI controller using by simulation and experimental results for verification validity of the fuzzy logic controller in tins system. The 7-phase BLDC motor and controller are modeled by PSIM6.0 software of PowerSim co. in simulation and we are experimented by the test board that is composed with TMS320VC33-150 DSP controller of Texas Instruments co. and FLEX EPF6016TC144-3 of ALTERA co.
교정치료에 따른 측모 연조직의 변화에 관한 계수공제 영상측정법적 연구
조원탁,유동환 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.3
본 교정 치료에 의한 경조직과 측모 연조직의 변화를 정량화하고 그들 상호간의 관계를 규명하기 위하여 원광대학교 치과대학 교정과에서 내원한 교정환자중 성장이 완료된 40명(발치군 20명, 비발치군 20명)의 여자 환자를 대상으로 치료 전후의 두부방사선계측사진을 채득하여, 경조직과 연조직 항목의 변화를 계측하고 계수공제영상 측정법을 이용하여 구순의 변화면적을 산출항 다음과 같은 결론을 얻었다. 발치군에서의 상순과 하순부위의 연조직 변화(UL, LL)는 558.60±355.17, 941.15±364.07 pixels이었으며, 비발치군에서의 상순과 하순 부위의 연조직 변화(UL)는 상악 중절치의 이동량(△UIP)과 높은 상관성이 있으며, 하순부위의 연조직 변화(LL)는 상악 중절치의 이동량(△UIP), FH평면에 대한 상악중절치의 각도의 변화(△FUIA), 절치간 각도(△IIA)와 높은 상관성을 보였다. 상악중절치 변화(△UIP)와 상순변화(△LS)의 비율은 1.68, 하악중절치 변화(△LIP)와 하순변화(△LI)의 비율은 1.19, 상악중절치 변화(△UIP)와 상순의 두께 증가량(△TUL)의 비율은 1.95이었다. 비발치군에서는 상순부위의 연조직 변화(UL)와 상악중절치의 변화(△UIP)간에 유의한 상관성이 인정되었다. The purpose of this study was to quantify the changes of soft tissue profile following orthodontic treatment and to evaluate the relationship of those to the skeletal elements. Pre-and post-treatment lateral cephalometric head films of 40 cases(20 extraction cases, 20 non-extraction cases) were traced, and the changes following treatment were measured and quantified by digital subtraction method, and statisticall analyzed. The obtained results were as follows; 1. in extraction group, the change of upper lip area(UL) was 558.60±355.17 pixels, that of lower lip area(LL) was 941.15±364.07 pixels. But, in non-extraction group the change of upper lip area(UL) was 125.65±404.16 pixels, that of lower lip area(LL) was 104.05±440.93 pixels, which was significantly lesser than those in extraction group. 2. In extraction group, there was significant correlationship between upper lip area change(UL) and difference of upper incisor point(△UIP). Lower lip area change(LL) was significantly correlated with difference of upper incisor(△UIP), difference of Frankfort upper incisor angle(△FUIA) or difference of interincisal angle(△IIA). 3. In extraction group, the ratio of difference of upper incisor point(△UIP) to difference of labrale superius(△LS) was 1.68; difference of lower incisor point(△LIP) to difference of labrale inferius(△LI) was 1.19; difference of upper incisor point(△UIP) to increment in upper lip thickness(△TUL) was 1.95. 4. In non-extraction group, there was a significant correlationship between upper lip area change(UL) and difference of upper incisor point(△UIP).