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Pattern Search법을 이용한 강의실 조명 향상
심용식(Yong-Sik Shim),최홍규(Hong-Kyoo Choi),박승원(Seung-Won Park),서범관(Beom-Gwan Seo),임명환(Myung-Hwan Lim),신혜영(Hye-Young Shin) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
강의실은 학생들이 학습을 하는 공간으로 정확한 정보취득과 시작업을 요한다. 강의실의 조명환경에 대한 문제점은 학습효과의 저하뿐만 아니라 학생들의 시력에도 악영향을 미치게 된다. 따라서 학생들이 대부분의 시간을 보내는 강의실의 알맞은 조명을 얻기 위한 연구가 필요하다. 현재의 대학 강의실의 일반조명시스템과 다운라이트를 적용한 조명시스템을 컴퓨터 시뮬레이션을 통하여 비교, 검토해보면 다운라이트를 적용한 조명 시스템은 강의실의 조도를 개선하며, 등기구 초기 투자 비용의 절감으로 경제성을 향상시키고 에너지 절약을 가져올 수 있다. Lecture room, for student to study, need to get exactly information and show up what students are required. So, problems for illuminated environments are low effect of studying, and that students may get weak-sighted. Research is required to get enough lighting for lecture room which students spend most their time. If we compare lighting system for recent college lecture room with computer simulation, lighting system at the lecture room with down light will be improve intensity of illumination. Therefore we can get economical benefit and save energy.
접촉전압 감소를 위한 비등간격 사선 Mesh접지에 관한 연구
심용식(Yong-Sik Shim),최홍규(Hong-Kyoo Choi),김태훈(Tae-Hoon Kim),정인혁(Jung-In Hyeok) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
고장 전류가 접지극을 통해 대지로 유입될 경우 대지전위상승이 발생함과 동시에 최대예상 접촉전압이 발생한다. 최대예상 접촉전압의 감소를 위해 접지 Grid의 간격, 두께, 총 도체길이, 매설깊이 등을 조절하여 저감할 수 있으나 경제적 부담이 발생하게 된다. 본 문에서는 사선 Mesh접지의 Grid 간격 조정을 통해 설계한 비등간격 사선 Mesh접지와 기존의 Mesh접지에 동일한 접지설계 제원을 적용하여 시뮬레이션 한 결과 비등간격 사선 Mesh접지의 최대예상 접촉전압이 감소하였고 부가적으로 접지저항, GPR이 감소하였다.
메쉬접지극의 내부도체 배치에 따른 개선된 메쉬접지극 모델
심용식(Yong-Sik Shim),최홍규(Hong-Kyoo Choi),김태훈(Tae-Hoon Kim),송영주(Young-Joo Song) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.6
국내?외 메쉬접지극은 격자형태의 등간격 접지Grid로 설계하고 있다. 격자형 접지Grid의 경우 구석의 접촉전압이 중심 부분에 비해 높아지는 문제점이 있다. 이러한 문제점을 극복하기 위해 사선형태의 접지 Grid를 사용하면 메쉬전압이 발생하는 구석부분의 면적이 감소함으로써 메쉬전압이 감소한다. 따라서 본 논문에서는 기존의 격자형태의 접지Grid의 형태와 다르게 사선형태의 접지Grid를 제안하며, 격자형태의 접지Grid와 사선형태의 접지Grid로 설계된 메쉬접지극에 동일한 접지설계제원을 적용하고 메쉬전압, GPR, 접지저항, 접지도체의 총길이를 비교 검토하여 사선형태 접지Grid의 우수성을 검증하였다. Mesh grounding electrodes in Korea and abroad are designed as lattice-shaped equidistance grounding grids. In case of a lattice-shaped grounding Grid, however, there is a problem of higher touch voltage at the corner of the grid relative to the center. To overcome this problem, we used oblique-shaped equidistance grounding grid to reduce the area of the corner where mesh voltage occurs. As a result the mesh voltage was reduced. Therefore, this paper suggests the use of oblique-shaped grounding grid instead of the existing lattice-shaped ones. It applied the same grounding design dimensions for both lattice-shaped and oblique-shaped grounding grids, compared and analyzed mesh voltage, GPR, ground resistance, total length of grounding conductor, verified that oblique-shaped grounding grid is superior to the lattice-shaped.
봉상접지극과 Mesh접지극의 매설깊이 변화에 따른 위험전압 분석에 관한 연구
심용식(Yong-Sik Shim),최홍규(Hong-Kyoo Choi) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.4
Grounding electrodes with higher burial depths are evaluated to have better performance, due to the domestic practice that puts the grounding resistance as the standard of performance evaluation, while grounding resistance decreases as the burial depth increases. However, The dangerous voltage is necessary for the analysis. Because the performance evaluation of grounding electrodes should include not only grounding resistance but also the dangerous voltage(mesh voltage and step voltage). So in this paper, The dangerous voltages of mesh grounding and rod grounding were analyzed for using computer simulation and miniature grounding model.
김양수(Yang-Soo Kim),심용식(Yong-Sik Shim),최대원(Dai-Won Choi),김태훈(Tae-Hoon Kim),이정은(Jung-Eun Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
본 논문에서는 국내 접지설계 환경의 적정성 여부를 검토하여 ANSI/IEEE Std.80-2000을 보완한 새로운 접지시스템 설계방법을 이용하여 접지설계를 검토하였으며, ANSI/IEEE Std. 80-2000 Annex B의 사례 연구를 통해 기존방식과 비교 검토하여 신뢰성과 경제성을 검증하였다.
Electric-optical Characteristics of LED Flat Light Source in Low Temperature Condition
한정민(Han Jeong Min),심용식(Shim Yong Sik),정찬웅(Jung Chan Oong),오선(Oh Seon),황종선(Hwang Jong Sun),최대섭(Choi Dae Seub) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
LCD (liquid crystal display) industry is needed to goods of high reliability and is interested in products without harmful material. In this experiment, we made the LED backlight unit for Automotive-navigation. And for making this backlight unit we used to eight side emitting type white LEDs with 1W high power of the lumileds company. We could know that this backlight unit releases to 6500 rut in 14W power consumption and start up voltage time is under the15㎳ in the ambient temperature -20 ℃
김종수(Jong-Soo Kim),최홍규(Hong-Kyoo Choi),박준열(Jun-Yeal Park),심용식(Yong-Sik Shim),김태훈(Tae-Hoon Kim),신혜영(Hye-Young Shin) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
Grounding electrodes with higher burial depths are evaluated to have better performance, due to the domestic practice that puts the grounding resistance as the standard of performance evaluation, while grounding resistance decreases as the burial depth increases. However, the performance evaluation of mesh grounding electrodes for uses in power stations and substations should include not only grounding resistance but also the dangerous voltage(mesh voltage and step voltage) in precaution towards the increase of land-voltage at the occurrence of ground-fault. This article investigates on the changes in grounding resistances and dangerous voltage(mesh voltage and step voltage) according to the changes in burial depths of mesh grounding electrode.
Study of Optimized Reflector Design for Road Light Using Ray-Tracing Method
최대섭(Dae-Seub Choi),한정민(Jeong-Min Han),심용식(Yong-Sik Shim),정찬웅(Chan-Oong Jeong),오선(Seon Oh) 대한전기학회 2009 전기학회논문지 P Vol.58 No.3
In this study, it was studied about the improved road light design for drivers and pedestrians using forward or reverse ray-tracing method. Many of conventional road lights are not suitable for drivers and pedestrians because it has some serious problems such as glare effect or randomicity of illuminated areas. It was oriented from customary design method which was pointed at simple target such as luminance or electrical power. But it was not truth any more that the high luminance or electrical power consumption mean more bright and good road light. We studied ray-tracing method for road light reflector design to get the several goals. It means that good road light has easy for drivers and pedestrians eyes and illuminating objects on the road clearly. So, we set the design targets such as uniformity on the road area per one road light, shading angles and continuous luminance uniformity on the long distance road. We designed ideal road light conditions using ray-tracing method. We set the height of drivers and pedestrians eyes and calculated design guideline to make above design targets. Then we designed road light reflector using reverse ray-tracing method. And we achieved same luminance on the road almost half power consumption because we reduced loss of light. We achieved ideal design guide as 75 degrees of shading angles and 0.5 of luminance uniformity on the road area. It is superior than conventional road light ability such as 0.35 of luminance uniformity of 400 watts power consumption lamp. Finally, we suggested reflector design for 250 watts power consumption CDM Iight source.