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윤희상,이화용,정백호 湖西大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.21 No.-
In the paper, we present a time-domain combined field integral equation(CFIE) formulation for analyzing transient electromagnetic responses from three-dimensional(3-D) closed conducting bodies. Instead of the conventional marching-on in time(MOT) technique, the solution method in this paper is based on the Galerkins method that involves separate spatial and temporal testing procedure. Triangular patch basis functions are used for spatial expansion and testing functions for arbitrarily shaped 3-D structures. The time-domain unknown current coefficient is approximated by using an orthonormal basis function set that is derived from the Laguerre functions. These basis function are also used as temporal testing functions. The method to be described results in very accurate and stable transient responses from conducting objects without an internal resonance. Detailed mathematical steps are included and representative numerical results are presented and compared.
윤희상,박훈희,이찬우,최승회 국회입법조사처 2017 입법과 정책 Vol.9 No.1
The purpose of this study is for the observation of condition and demand of inactive people with spinal cord injury so that we can provide base information for building a national strategy. This research is to suggest the combined factors of health and welfare for inactive people with spinal cord injury lead independent activity of daily living. The survey showed there are more inactive people with spinal cord injury married men than women, in case of women have longer hospitalization period than men due of lack of personal assistance service. And inactive people with spinal cord injury have lower rate of health examinations, hospital visiting and regular physical activities, while higher rate of suicide impulse and there are more recipients of the national basic livelihood security and near poor than active people with spinal cord injury. In addition the people who are aware of KSCIA among inactive people with spinal cord injury, they are more active in external activities. The national policy and the concern of related society for supporting inactive person are needed in order to make them lead a proper life in their family and this society. 이 연구의 목적은 비활동척수장애인의 생활 실태와 요구를 조사하여, 비활동척수장애인에게 필요한 국가 정책 수립에 기초자료를 제공하는 것이다. 측정 도구는 121개 문항으로구성된 설문을 이용하였고, 비활동척수장애인 202명을 중심으로 분산분석과 -검정과같은 통계적인 분석을 이용하였다. 비활동척수장애인 중 여성과 이혼자의 입원 기간이길어 일상생활에 지원이 필요한 대상으로 조사되었고, 비활동척수장애인은 기초생활수급권자나 차상위계층 비율이 높았다. 또한, 건강검진과 정기적 운동 실천 비율은 낮고, 자살 충동을 느끼는 비율은 높았다. 본 연구의 결과에 따라 비활동척수장애인이 활동척수장애인으로 살아가기에 필요한 통합적인 활동지원 대책 및 사회일원으로 활동할 수 있는 정책적, 제도적 지원이 요구됨을 알 수 있다.
尹熙相 湖西大學校 工業技述硏究所 1988 工業技術硏究所論文集 Vol.7 No.-
The demand for higher switching frequencies in power conversion. has rekindled int-erest in resonant mode topolongies. Most of conventional resonant inverter circuitits oper-ate phase shift PWM, however, this study describes the optimal single pulse in orthe to reduce total harmonics distortion. For frequncy tracking, a phase locked loops circuits is used main control element to detect the phase difference of voltage and current of series resonan load. A prototype inverter using POWER MOS FET has been tested with a tranducer to demonstrate experimentally the proposed drive gate circuits.