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위상변위제어에 의한 클램프 모드 포워드 다중공진형 컨버터
김창선,김희준 漢陽大學校 工學技術硏究所 1996 工學技術論文集 Vol.5 No.1
In this paper, the phase shift controlled clamp mode forward multi-resonant converter (PSC CM Forward MRC) which compensates darwbacks of traditional forward multi-resonant converter is proposed. The converter regulates the output voltage by varying resonant frequency through phase shift controlled switch (PSCS) at fixed switching frequency. Also, the voltage stress of main switch can be reduced to two-three times input voltage by the soft switching active clamp circuit. The operation of proposed converter is verified by simulation and analysis for each mode according to switching sequence is established. In order to prove the validity of theoretical results, the 1MHz, 5V, 52W converter was built and tested. And it is confirme
자동차 조립공장 근로자의 누적외상성질환 자각증상 호소율과 관련 위험요인
김창선,김광종,최재욱,윤수종 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.1
Background : It goes without saying that cumulative trauma disorders is spreading to various types of occupation in many advanced contries including American, and it forms con-siderable rate of total occupational disorders already, and as the result of it, the seriousness of worker health problem and economic loss owing to production loss, recuperation expense, etc. Are on the increasing trend through whole society. In case of Korea, the related measures as well as accurate fact-finding survey data on cumulative trauma disorders aren't prepared in detail, so it implies forward problem would be serious. Purpose : The purpose of this study is to draw the risk factor of cumulative trauma disorders in production factory, to forecast the rate of occurrence of cumulative trauma disorders on the basis of subjective symptoms, and to present forward realistic and effective prevention measures by showing the risk of cumulative trauma disorders, objecting the production factory of a domestic riding automobile assembly shop, by estimating in the aspect of human-engineering through the analysis of risk factor being a cause of cumulative trauma disorders. Methods : For this study, I investigated work type and on-duty hours, breathing time, and subjective symptom of cumulative trauma disorders through questionnaire, objecting the workers in press, car body, coating, and outfit factory. Results : As a result of research, 81.2% of workers were in the physical burden due to present working, and the highest prevalence by part of body is an waist. The higher a rule score, The higher the number of workers complaind for working intensity, and the higher age work duration, tool used time, the highest prevalence of subjective symptoms by part of body. The number of workers complaind subjective symptom for treatment is the highest in drugstore.
부지연 회로를 내장한 200MHz 고속 16M SDRAM
김창선,장성진,김태훈,이재구,박진석,정웅식,전영현 대한전자공학회 1997 電子工學會論文誌, C Vol.c34 No.4
This paper shows a SDRAM opeating in 200MHz clock cycle which it use data interleave and pipelining for high speed operation. We proposed NdC (Negative DEaly circuit) to improve clock to access time(tAC) characteristics, also we proposed low power WL(wordline)driver circit and high efficiency VPP charge-pump circit. Our all circuits has been fabricated using 0.4um CMOS process, and the measured maximum speed is 200Mbytes/s in LvTTL interface.
김창선,이훈갑,이기찬,주정화 대한신경외과학회 1981 Journal of Korean neurosurgical society Vol.10 No.1
Choriocarcinoma is originally described by Sanger in 1889 and it may be changed from hydatadiforme mole, abortion and rarely normal pregnancy. The incidence of spinal metastasis is unknown. We have reported a case of a 17 year-old female who admitted to Korea University Hospital on September 10, 1980, with complaints of severe pain and motor weakness of the legs. She had episode of laparatomy for removal of tumor mass of Rt. ovary 4 months prior to admission. She has received operation for the removal of the spinal metastatic tumor on the 5 th admission day and the mass was proved as metastatic choriocarcinoma pathologically.