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플라이휠 시스템의 최적화를 위한 마그넷 베어링의 시뮬레이션
김덕구 ( Deog Goo Kim ),조금배 ( Geum Bae Cho ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.3
We have analyzed electromagnetic characteristics of a superconducting bearing using the Maxwell 3D program. The superconducting bearing, which was the important part of the superconducting flywheel energy storage system, composed of a stator and a rotor. Magnetic fluxes of the permanent magnets were applied to the superconducting units and resulted in the decrease of mutual flux linkage. The irons located at center induced the magnetic flux from the parallel axis which increased the flux linkage between permanent magnets and superconducting units. This might be due to the perfect diamagnetism of the superconducting units.
변압기형 초전도 한류기의 사고유형에 따른 전류제한특성 분석
김덕구(Deog-Goo Kim),조용선(Yong-Sun Cho),최효상(Hyo-Sang Choi),정병익(Byoung-Ik Jung),최수근(Soo-Geun Choi),하경훈(Kyoung-Hun Ha),고성필(Sung-Pil Go) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
In the transformer-type superconducting fault current limiter (SFCL), the neutral line connects the superconducting units with the secondary windings. The fault current limiting characteristics of the three-phase transformer-type SFCL with a neutral line were analyzed. In the case of the single line-to-ground fault, about 90% of the fault current on the faulted phase was limited. However, in the case of a double line-to-ground fault, the flux from the faulted-phase winding interlinked with the other windings on the faulted and sound phases to create an inductive current, and limited about 70% of the faulted current.
김덕구(Deog-Goo Kim),오성보(Seong-Bo Oh) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.11월
This paper describes the simulations on the actual measurement analysis and lighting design for recreational sports facility. Based on illumination requirements, sports may be divided into multidirectional sports and unidirectional sports. Typical multidirectional aerial sports include Jokcu. These sports require well distributed horizontal illumination and uniformity according to aiming. Therefore, this paper estimates horizontal illuminance and uniformity ratio by actual measurement of sports lighting at recreational Jokcu court in Cheju National University and evaluation of sports lighting conditions for optimal design by computer simulation.
김덕구(Deog-Goo Kim),오성보(Seong-Bo Oh) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
대학구내 공원시설은 학생들과 시민들이 다양하고 안전하게 사용할 수 있도록 여러 시설을 갖추고 있어야 하며 야간에도 활용 가능케 조명시설을 갖추고 있어야 한다. 본 논문에서는 소공원내의 산책로에서는 볼라드 타입 메탈할라이드 50[W]를 지그내그 배열로 배치하였고, 운동기구에서는 안전성 확보를 위하여 메탈할라이드 400[W]를 7개를 설치하여 조명 계획을 검토하고 설계하였다. 산책로와 운동시설에 대한 시뮬레이션 결과를 활용하여 안정적인 조명모델을 제시 하였다.
김덕구(Deog-Goo Kim),오성보(Seong-Bo Oh) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
The visual environment in an educational building, apart from providing the comfortable seeing conditions needed for the performance of a wide variety of work tasks, must also satisfy the psychological and emotional needs of learners. This paper presents study on actual illumination environment of college and comparison of economical efficiency in order to figure out illumination problems. Furthermore, it attempts to suggest an optimum design of lecture room illumination through computer simulation. We try to evaluate economical efficiency of lighting design in lecture room under the illumination plan which is based on illumination maintenance and uniformity ratio that K.S. illumination standard sets.