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이만호(M H Lee),이상종(S J Lee),김철우(C W kim),채종찬(J C Chae),박영철(Y C Park),정을순(E S Chung),김명숙(M.S. Kim) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.2
N/A Barrett's esophagus is a condition in which the normal stratified squamous mucosa of the esophagus is replaced by columnar mucosa, and it may be suspected on abnormal findings of endoscopy and the diagnosis is usually proved by biopsy. We have observed 10 cases suspecting with Barrett's esophagus on the endoscopic findings. Only 5 cases of them, however, could be proved as columnar epithelium-linked esophagus with histological examination. We observed for clinical features regarding age, sex, symptorns, habits, locations, combined diseases, and combined laboratory abnormalities for them. No significant differences of clinical features except serum lipid levels were seen between both groups of Barretts esophagus and chronic esophagitis. 1) All 5 patients with columnar epithelium-linked esophagus was male, and age distribution was from 35 to 60 with mean age of 50. 2) Number of the patients who complained reflux symptoms was 2 out of 5 patients. 3) There were 2 heavy alcohol consumers, 1 coffee drinkers, and 2 heavy cigarette smokers. 4) Location of the lesion was seen on upper esophagus in 3 cases, and on lower esophagus in 2 cases. 5) As a combined diseases, 2 cases with duodenal ulcer, 2 cases with fatty liver, one case with hepatitis, and one patient with rectal polyp. 6) In all 5 patients, serum cholesterol, serum triglyceride level, or both were elevated.
김원호(W. H. Kim),강유리(Y.L. Kang),김성준(S. J. Kim),이광학(K. H. Lee),김철우(C. U. Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
With the increasing demands for clean environment, development of air cleaning systems has been received increasing attention.<br/> Pulse power systems are widely used for air cleaning in the industrial applications. high voltage pulse power supply affects the performance of the overall environmental system<br/> In this study, high voltage micro pulse power supply for removing NOx in diesel engines is developed.<br/> The ratings of the pulse voltage is 20kV. The pulse width is 10usec and max. pulse repetition ratio is 1kHz.
Z축 운전구조를 갖는 선형 영구자석형 동기 전동기 운전제어에 관한 연구
이진하(C.H. Lee),최철(C.Chou),박한용(H.W. Park),김철우(C.U. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
In this study a control system with variable gain schedule using real speed and moving direction is proposed to control a Permanent Magnet Linear Synchronous Motor (PMLSM) with Z-axis operation structure. <br/> The implementation of the controller is designed on the DSP TMS32OC32 board PMLSM is operated by using 4-point absolute positions profile with each velocity, acceleration and deceleration. The direction of the initial angle action for starting is set from the lower limit point to the upper limit point on PMLSM operation stroke The effectiveness of a control system with variable gam schedule is demonstrated by some experimental results<br/>
태양광 저에너지 출력을 위한 Buck, Boost 컨버터 구동방식
김병우(B.W. Kim),박성준(S.J. Park),김광헌(K.H. Kim),손무헌(S.M. Heon),조수억(S.E. Cho),김철우(C.U Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Normally, the buck converter is used for the charging converter of photovoltaic generator because this converter has good characteristics compare with boost and buck-booster converter. But, in case of the sollar-cell voltage is lower than charging voltage, we cannot charge the sollar energy to the charger. So, in this paper, we proposed the novel hybrid converter using by combination of buck and boost converter for the charging converter of photovoltaic generator, as a results, it can operate buck, boost and buck-boost mode. The proposed novel converter has the same characteristics of the existent buck converter and furthermore it can operate as a boost converter. So, we can make the more effective photovoltaic charging system.