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황병원,고우정웅 대한교통학회 1994 대한교통학회지 Vol.12 No.4
This paper describes system and its algorithm which can measure traffic flow on the road by using industrial television applied in industry. This algorithm is using the real-time processing of dynamic scenes. The processing algorithm of dynamic scenes is developed and proved its validity by designing VISC (Video Information Sampler and Converter). The accuracy of this algorithm is enhanced by allocating sampling points in cross-direction of the vehicles.
견인용 동기전동기의 시동 및 운전특성 해석에 관한 연구
황정원,조용길,송호신,박한규,우정인 東亞大學校 1994 東亞論叢 Vol.31 No.1
It needs a large capacity of equipments to test the starting performance of middle and large synchronous motors in a factory. This paper propose a new method which is the combination of single phase AC applied test and usual routine test with a small synchronous test machine and testing equipments. We can obtain the results from these proposed tests as follows ; (1) The starting performance and stabilized operation at variable speed is predicted from this results. (2) The armature winding leakage reactance is resulted from the no-load saturation curve, the short-circuit charactristic curve and the armature-reaction magnetomotive force converted to the field current. (3) This test must be performed twice, one for short-circuiting the field winding, the other for joining a resistance between the field terminals, as a result the unknown constants in equivalent circuits are identified. (4) Inverter-fed three phase voltage with variable frequency is applied to armature terminals, as a result, We show the actual armature leakage reactance and reaction of the induced harmonic voltages from rotor.
영구자석 동기발전기의 정주파수 정전압 출력에 관한 연구
우정인,조용길,황정원,송호신 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
The permanent magnet machines have the advantages of high efficiency and power density, features very improtant for air-borne applications with their requiement of no external dc supply for rotor excitation, in addition, a very lower synchronous reactance thus making it a stiff source of power with a higher steady state and more transient capability than ist counterpart, the wound rotor type. In this paper, The permanent magnet synchronous machine is taken as a power source in the variable speed constant frequency power conversion scheme with converter-inverter system. All digital routines are excuted in the sampling time of 100 micro second by a DSP Board (TMS320c25) with A/D converters, which is detect the load current, capacitor current and DC link voltage at a sudden load change and to compute the predicted current. In one sampling interval, two optimal space voltage vectors as well as tow zero voltage vectors are employed so that the capacitor current may follow the reference. As a result, sinusoidal output constant voltage is obtained while swiching frequency is constant, and experimental results are presented, which shows the effectiveness of the proposed control method.
황상일,백동기,최우정,조권일,신학수,양경석,김동웅,신선호,최진영,Hwang Sang-Il,Back Dong-Gi,Choi Woo-Jung,Cho Gwon-Il,Shin Hak-Su,Yang Kyung-Suk,Kim Dong-Woung,Shin Sun-Ho,Choi Jin-Young 대한한방내과학회 2003 大韓韓方內科學會誌 Vol.24 No.2
Objectives : This study was to investigated using National Institutes of Health Strokes Scale score in 36 patients with middle cerebral artery infarction and to enaluate prognosis. Method : The subjects oh this study were 36 patients who were admitted to the Wonkwang oriental medicine. Improving rate were measured by using the National Institutes of Health Strokes Scale score. Each patient was diagnosed with Brain Computerized Tomography, Magnetic Resonance Imaging and clinical observation. Results : There were significant results statistically between National Institutes of Health Strokes Scale score and middle cerebral artery territories. While sex, age, hypertension, diabetes mellitus and heart disease were not siginificant meaning statistically. Conclusions: Sex, age, hypertension, diabetes mellitus and heart disease were relevant factors in predicting the functional outcome in the patients with middle cerebral artery infarction. In this study, middle cerebral artery territory affects the functional outcome.
경기도 내 업종별 사업장 대기배출가스의 VOCs 배출 특성 연구
김은아,우정식,황선민,최윤호,황철원,조의호,이상철,황현아,김요용,오조교 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
본 연구는 경기도 내 사업장 중 도장업, 인쇄업, 섬유가공업, 화학물질제조업, 금속제품가공업 5개 업종 32개 사업장의 대기배출가스 중 휘발성유기화합물 14종의 배출 특성을 조사하였다. 휘발성유기화합물질이 많이 배출되는 도장업, 인쇄업, 화학물질제조업은 Benzene, Ethyl benzene, Toluene, Xylene이 검출되며, 섬유가공업과 금속제품가공업은 Dichloromethane과 Toluene, Xylen이 많이 검출되는 특성을 나타냈다. 대기배출가스 중 휘발성유기화합물질의 농도가 높은 도장업, 인쇄업, 화학물질제조업은 직접 연소에 의한 방지시설 운영이 흡착에 의한 방지시설 운영보다 오염물질 관리 측면에서 유리한 것으로 나타났다. 또한 섬유가공업과 금속제품가공업의 대기배출가스에 휘발성 유기화합물질이 배출됨에 따라 흡착 방지시설의 추가설치가 적절할 것으로 판단된다.