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강경우(Kyoung-Woo Kang),김현식(Hun-Sik Kim),고종선(Jong-Sun Ko),홍순찬(Soon-Chan Hong) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper presents load torque observer that is used to deadbeat load torque observer in the induction motor position control system. The simulation has been obtained by simulink. A digital control is composed by trigger method in the continuous block diagram. The results show that proposed system has good effectiveness for the disturbance in induction servo motor system.
강경우(Kyoung-Woo Kang),서정호(Jeong-Ho Seo),곽태균(Tae-kyun Kwak),고재훈(Jae-Hun Ko),심보석 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
지금까지 국내 대전력 가공송전망은 교류중심으로 이루어지고 있었음. 하지만, 직류가공송전(High Voltage Direct Current Overhead Transmission)의 장점이 부각되며 세계적으로 직류가공송전의 건설 및 운영이 증가 하고 있음. HVDC 전력망은 기존의 교류 전력망에 비해 전력손실이 적고 비상상황 시 다른 전력망에 미치는 영향이 작아서 블랙아웃등의 위험성이 적어 안정적인 전력공급이 가능하고, 송전탑의 규모를 약 30 %까지 줄일 수 있는 등 여러 장점이 있음. 이에 국내 건설 예정인 HVDC 가공 송전선로의 도입을 위해 전기설비기술기준의 제·개정(안)을 제시하였다.
AC PDP용 멀티레벨 에너지 회생회로의 개선에 관한 연구
정우창(Woo-Chang Jung),강경우(Kyoung-Woo Kang),정대택,유종걸(Jong-Gul Yoo),고종선(Jong-Sun Ko),홍순찬(Soon-Chan Hong) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
A new multi-level type energy recovery sustaining driver for AC PDP(Plasma Display Panel) is proposed in this paper. The hard switching is eliminated using CIM(Current Injection Method) and thus the voltage stress on switching elements is more reduced. The Vs/2 sustain period is eliminated as much Vs sustain period can be extended. Moreover, Comparing the proposed sustain driver with the conventional multi-level driver, 4 switching elements, and 2 auxiliary capacitors are eliminated in the viewpoint of circuit structure. To verify the validity of the proposed energy recovery circuit, computer simulations using PSpice program are carried out.
홍순찬,정우창,강경우,유종걸,Hong, Soon-Chang,Jung, Woo-Chong,Kang, Kyoung-Woo,Yoo, Jong-Gul 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.4
본 연구는 AC PDP(Plasma Display Panel)용 멀티레벨 에너지 회수회로에 관한 연구로서, 기존 멀티레벨 구동회로의 문제점을 해결한 새로운 멀티레벨 구동회로를 제안한다. 기존 멀티레벨 구동회로는 Weber회로에서 나타나는 스위칭 소자의 전압 및 전류 스트레스를 개선하였지만 공진 인덕터와 기생 커패시턴스에 의한 기생공진전류가 존재하고 하드스위칭이 발생하며 또한 천이구간이 다소 긴 문제점이 있다. 제안 회로는 사용소자의 수를 줄여 회로를 간단히 하였으며, 기생공진전류를 제거하여 회로 동작의 안정성을 높였다. 또한 CIM(Current Injection Method) 을 사용하여 하드스위칭 문제를 해결하였으며 Vs/2 유지구간을 제거하여 동작주파수를 증가시킬 수 있도록 하였다. 제안 회로의 유용성을 입증하기 위해 모드별로 동작을 해석하였으며, PSpice프로그램을 이용하여 시뮬레이션하고 그 결과를 확인하였다. This paper proposes a novel multi-level energy recovery sustaining driver for AC PDP(Plasma Display Panel), which solves the problems of the conventional multi-level sustaining driver. While the conventional circuit improves the voltage md current stress of the switching elements in Weber circuit not only there are parasitic resonant currents between resonant inductors and parasitic capacitance and hard switching, but also the changing period between 0 and sustain voltage is too long. Comparing the proposed circuit with the conventional circuit, the number of components are reduced and the parasitic resonant currents in resonant inductors are eliminated Moreover the hard switching problem is solved by using CIM(Current Injection Method) and the operating frequency will be high as much as possible by removing Vs/2 sustain period. And the circuit operations of the proposed circuit are analyzed for each mode and the validity is verified by the simulations using PSpice program.
홍은경(Eun Kyoung Hong),장명준(Myeong Jun Chang),강경우(Kyeong Woo Kang),전용철(Yong Cheol Jeon),이명석(Myung Seok Lee),김우중(Woo Joong Kim),심정원(Jung Weon Shim),이영철(Young Chul Rhee),정수영(Soo Yeong Jeong) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.4
Xanthogranulomatous cholecystitis is an uncommon focal or diffuse destructive inflammatory lesion of the gallbladder. It is characterized macroscopically by yellowish tumor-like mass in the wall of the gallbladder, and microscopically characterized in the early stages by a large number of foamy histiocytes and acute inflammatory cells, and in the )ater stages by increasing fibrosis. It has been usually mistaken for gallbladder cancer and often seen with stones. A case is presented in which a 59-year-old woman with clinical gallbladder cholesterol polyp was found at surgery to have a edematous and thickened wall of gallbladder, multiple black pigmented stones and 3 x 0.5cm sized yellowish mass on gallbladder bed which was confirmed later as xanthogranulomatous cholecystitis, pathologically. (Korean J Gastroenterol 1996;28:582 - 586)