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Thyristor에 의하여 제어되는 3상유도 전동기의 기동특성
尹炳度,河龍守,崔元銀 중앙대학교 기술과학연구소 1974 기술과학연구소 논문집 Vol.1 No.-
The steady state and the transient performances of the induction motor controlled by thyristor are studied using state variable method and compared with experimental results. The design of the inverter is studied and the design criteria are developed.
적응제어 이론을 기초로한 영구자석 동기 전동기의 강인성 제어시스템
윤병도,윤명균,김윤호,공상호 중앙대학교 기술과학연구소 1991 기술과학연구소 논문집 Vol.21 No.-
The Permanent Magnet Synchronous Motor (PMSM) is favored in industrial servo application in recent years because of its high efficiency and torque to inertia. Vector-control scheme simplifies the analysis of ac motor characteristics and design of control system. By vector-control method, the control structure of PMSM can be linearized, thus PMSM has the same operating characteristics as separately excited dc motor. The drive system of servo motor is requested to have robustness of disturbance and parameter variation. However, the dynamics of PMSM drive is changed significantly by forced disturbance and parameter variation. Moreover, the state error caused by them should be suppressed completely and rapidly. In this paper, the vactor-control system of PMSM using dual adaptive control loop is investigated. In the proposed system, linear adaptive control loop rapidly recovers the state error caused by both disturbance and parameter variation. In the dual adaptive control loop, the inner loop reduces the system sensitivity of parameter variation and disturbance, and the outer loop suppresses the state error caused by them completely. The proposed servo system is verified through a computer simulations and experimental results.
윤병한,하안례,이용환 고신대학교 보건과학연구소 2002 보건과학연구소보 Vol.12 No.-
This study investigated the existing remedies and the complementary and alternative medicine used by the liver-disease patients who live in Busan City and KyeongSangNam-Do, and examined the concrete instances how they use those medical methods. Next, it tried to offer basic informations about the complementary and alternative medicine, in order to have a correct selection and right treatment & management, by understanding reasons why they adopt the complementary and alternative medicine, their satisfaction degrees, and sort of complementary and alternative medicine. The selected patients were 300 outpatients of liver-internal department in Kosin University Gospel Hospital located at Busan City, and interviewers directly carried out the questionnaire survey with those patients. The summarized study results were as follows; Out of the whole study subjects, the group who experienced the complementary and alternative medicine occupied 50.9%, and as for the recognition degrees of complementary and alternative medicine, 53.2% out of the whole subjects answered that they were ignorant of the complementary and alternative medicine. As for the places where they use the complementary and alternative medicine, the biggest figure was 64.5%, private residence, and 26.5% was Oriental medicine hospital. With respect to the sort of complementary and alternative medicine used by study subjects, 76.5% used dietary treatment and nutritious cure, which was the largest figure; among the dietary cures, marsh snail belonging to animality occupied 30.1%, wild parsley belonging to vegetability reached 38.2%, green juice(NokJeup) belonging to health aiding food products occupied 42.0%. Most subjects answered that they are satisfied with the complementary and alternative medicine. As for the advantages of this complementary and alternative medicine, compared with those of the Western medicine, 38.2% answered 'no harm', 27.2%, 'psychological security', 14.1%, 'comparatively less (adverse) side-effects'. So most repliers that they favor this complementary and alternative medicine. It is proved that few adverse side effects occurred, that marsh snail, wild parsley, and green juice were taken mostly. More studies and clinical examination would be necessary to know what influences those health assistant food products have on the liver diseases.
尹炳道,李良雨,車得根 東義大學校産業技術開發硏究所 1990 産業技術硏究誌 Vol.4 No.-
This paper presents an analysis of the output voltage weveforms of the double sinusoidal modulated PWM inverter, and are studied on the driving characteristics trough the 3 phase induction motor using 6502 microcomputer. The double sinusoidal modulated waves are produced during the interval 4π/3[rad] for one cycle, and the switching loss can be reduced. The amplitude of fundamental wave of double sinusoidal modulated PWM inverter is 1.15 times higher than that of the sinusoidal PWM inverter, but the practical measured value by FFT analyzer is 1.13 times.