• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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• pp.263-268
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• 2008

In a residential complex case, the efficiency of land use are maximized, but a variation of external condition such as load in-equality, the increase in wind velocity and solar radiation by a height causes increasing energy in a building. Besides, because of increasing window size for a lighting and a view, it comes heating load in winter and cooling load in summer. A choice of cooling-system is important for this reason. Recently an internal high-rise residential complex installs an air-cooling system and operates individual heating. However, this study applies water-cooling used one public cooling-tower instead of an air-cooling system, also with an efficiency test of an air and a water-cooling system, consider an internal applicability.

• 한국주거학회논문집
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• 제18권1호
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• pp.11-18
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• 2007

At the economical crisis of Korea in 1997, self-determined price for apartment and the revision increasing the ratio of residential area for mixed-use residential building were introduced to activate the construction industry, which causes construction companies to build super high rise apartment discriminative and high class orientated. This study aims to classify the super high rise building which is planned to build or built recently and to analyze the architectural characteristics. The objects are 288 unit households in 26 apartment complexes higher than twenty five story since 1998. As a result, super high rise building comparing with existing apartments were being varied in plan types of main building and unit household and in construction types. As for the plan, the number of walls having opening to outdoor were increased and it is considered that high rise building can take advantage of a view, lighting and sunshine. The location of living room that used to be in the center of unit in existing apartment was moved freely without rule.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권1호
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• pp.24-28
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• 2004

Metal halide lamps have been made suitable for use in outdoor illumination systems over many years. They are also widely used in application and commercial lighting due to their attracting properties such as good quality color, rendering and high efficiency. Over the past few years, a considerable number of studies have been conducted on the electronic ballast with hot restarting and resonance phenomenon. However, very few attempts have been made at the adaptive ignition method according to lamp state. This paper proposes an electronic ballast for metal halide lamps with an igniter for adaptive ignition. The proposed electronic ballast can generate different ignition voltages according to the arc tube state. The experimental results showed that the proposed ballast circuit using adaptive igniter is suitable for 70W HQI lamps.

• 산업기술연구
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• 제30권B호
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• pp.113-118
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• 2010

In this paper, We proposed remote dimming control system for Light Emitting Diode(LED) street light using Power Line Communication(PLC). LED will be used widly by indoor or outdoor lighting because of semi-permanent life and environment restriction. For energy saving of street light, the dimming control system is very necessary and the PLC is a very efficient technique. Thus, in this paper we proposed the remote dimming control system for LED street light using PLC. A performance of the proposed system was validated by experimental results.

• Elastomers and Composites
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• 제50권1호
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• pp.1-6
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• 2015

Polybutadiene rubber (BR) has been well known that its physical and chemical properties are changed when it is exposed to ultraviolet light undergoing photooxidation. In this study, photooxdiation process of BR vulcanizate was investigated using a high pressure mercury lamp used as an outdoor lighting, which has high UV radiation efficiency and reasonable cost. Discoloration and crack formation of photooxdized BR vulcanite surface were examined using an image analyzer. Change of chemical functional groups of BR vulcanite surface by photooxidation was investigated using ATR-FTIR, and variation of the crosslink density with the UV irradiation time was investigated. By increasing the UV irradiation time, the crosslink density steeply increased after a period of time and did not increase any more. Formation of hydroxyl (~OH) and carbonyl (~C=O) groups on the BR vulcanizate surface increased and the1,4-cis unit was converted to the 1,4-trans unit as the photooxidation was proceeded.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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• pp.86-89
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• 2004

Recently polymer arresters are being used widely but we don't have appropriate long term characteristics test methods. Therefore we need to develop special test facility to evaluate long term reliability of polymer arresters. It's polymeric housing can be degraded by environmental stress and the interface between housing and inner module can be affected by moisture absorption. This moisture absorption can cause leakage current and tracking in the interface. We developed multi stress accelerated ageing test facility to simulate field conditions including UV, temperature, humidity, voltage, salt fog and rain. In addition, we carried out field exposure test at the outdoor test yard and characteristics analysis of field operated specimens to evaluate accelerating factor of this accelerated aging test.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.504-506
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• 2006

도시자연공원은 도심에 자연적으로 형성된 숲 속에 다양한 체육시설을 설치하고 이를 이용함으로서 도 시인들에게 휴식을 제공한다. 이 체육시설 가운데에 옥외 골프연습장은 국민의생활수준 향상과 함께 많은 시민들이 주간이나 야간에 이용하는 장소이며 이때 야간에 점등되는 조명설비는 이용자에게 공의 위치를 분명하게 확인하게 해주어야하고 눈부심이 없어야 한다. 또한 주변을 걷는 사람들에게도 조명에 의한 불쾌감이 없어야 한다. 도시자연공원의 주목적은 신체활동의 부족, 자기표현의 기회상실, 인간관계 등과 관련하여 신체활동을 통해 체력을 단련하고 생활에 활력을 가져 보다 밝고 풍요한 생활을 영위하는데 있으며 국민의 생활수준의 향상에 힘입어 향후 도시자연공원 체육시설은 급증 할 것으로 예측된다. 본 고에서는 이러한 도시자연공원에 설치할 옥외 골프연습장의 조명설비에 대한 설계를 소개하도록 한다.

• 한국컴퓨터정보학회논문지
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• 제27권7호
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• pp.49-55
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• 2022

본 논문에서는 날씨와 같은 외부 환경요인에도 강건하게 동작할 수 있는 장애물 감지 기법을 제안한다. 특히, DB 기반의 특징 매칭과 RANSAC(RANdom SAample Consensus)기반의 다중 평면 방식을 통해 증강현실(Augmented Reality, AR)에서 정확하게 위험 상황을 알려줄 수 있는 장애물 감지 시스템을 제안한다. RGB카메라로부터 얻은 영상을 기반으로 장애물을 검출하는 접근법은 영상에 의존하기 때문에 조명에 따른 특징 검출이 부정확하고, 조명이나 자연광 또는 날씨의 영향을 받기 때문에 장애물 검출이 어려워진다. 또한, 복잡한 지형에서 생성되는 다수의 평면은 장애물을 감지하는데 있어서 오차가 커지는 원인이 된다. 이 문제를 완화하기 위해 본 논문에서는 DB기반의 특징 매칭을 통해 조명에 관계없이 장애물을 효율적이고 정확하게 감지한다. 또한, 다중 평면을 RANSAC을 통해 단일 평면으로 정규화하여 특징점을 분류하기 위한 기준을 새롭게 계산한다. 결과적으로 제안하는 방법은 조명, 자연광, 날씨에 관계없이 효율적으로 장애물을 감지할 수 있고, 높낮이나 다른 지형에서도 안정적으로 표면을 감지할 수 있기 때문에 사용자의 안전성 확보에 활용할 수 있을 거라 기대한다. 제안하는 방법은 모바일 디바이스에서 실험한 결과가 대부분 안정적으로 실내/외의 장애물들을 인지하였다.

• Journal of Animal Science and Technology
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• 제64권1호
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• pp.1-9
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• 2022

Equilume light masks had no impact on hastening the resumption of estrous cyclicity in mares maintained in outdoor pastures on the mainland of Korea due to the cold weather conditions. Jeju Island is a major horse-breeding site in Korea and is warmer than the mainland during the winter season. Therefore, the primary objective of this study was to explore the efficiency of the Equilume light mask on the resumption of seasonal estrous cycles in Thoroughbred mares on Jeju Island. A total of 20 nonpregnant mares were randomly divided into the Equilume light mask (n = 9) and stable lighting (n =11) groups. The experiment was performed at seven different horse-breeding farms located on Jeju Island from November 15, 2020, to February 15, 2021. The mares were exposed to the respective lights from 16:00 to 23:00. Follicle size and uterine edema were measured by ultrasound scanning. Body condition scores (BCS) were also monitored during the experiment. Statistical analysis was conducted using the SAS and SPSS software, and p-values of < 0.05 were considered statistically significant. Two of the nine (22.2%) mares in the Equilume light mask group and three of the 11 (27.28%) mares in the stable lighting group were still cycling in December and January, which were considered as all-year-round cycling mares. On February 15, there was no difference between groups in the resumption of early seasonal estrus cycle, which was determined by follicles > 25 mm in addition to uterine edema. All mares in the Equilume light mask group and five of the eight mares (62.5%) in the stable lighting group had resumed cycling. Interestingly, six of the seven mares (87.5%) in the Equilume light mask and four of eight mares (50%) in the stable lighting group had already ovulated on February 15 (p > 0.05), as determined by the presence of a recent corpus luteum. No difference was observed in BCS and uterine edema between groups (p > 0.05). In conclusion, the Equilume light mask can be an effective approach to induce early seasonal estrus cycles of mares in Jeju Island, and it also enhances the efficiency of farm management by reducing labor.

• 한국산학기술학회논문지
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• 제19권1호
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• pp.98-104
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• 2018

빛공해의 주택 침입광은 현장에서 여러 환경 요인에 의해 정확한 평가가 쉽지 않다. 그래서, 현장에서의 측정 어려움을 대신하여 빛공해의 영향을 파악하기 위하여 시뮬레이션 프로그램(Relux 등)을 이용하여 분석하였다. 그러나, 침입광에 대한 실제 측정값과 시뮬레이션을 통한 예측값은 여전히 차이점이 존재한다. 본 연구에서는, 옥외조명에 대한 침입광을 조사하기 위하여 서울, 인천 등 측정지점을 선정하였다. 조도 측정은 주택창면 중 연직면 조도가 높을 것으로 예상되는 창문 밖 창면 2지점 이상의 측정지점을 선정하여 측정하였다. Relux 프로그램을 이용하여 예측된 값 중 최대값을 실측값과 비교하였다. 그 결과, 침입광 실측값과 예측값의 오차는 -0.97~0.65 lx(최대값[2.08lx]과 최소값[-7.70lx] 제외) 조사되어졌다. 주택창면을 기준으로 도로조명의 설치위치 높이(H), 거리(L), 너비(W)가 가까이 위치될수록 침입광은 높아짐을 알 수 있었다. 상용조명해석 프로그램(Relux)을 사용하여 예측값을 측정하는데 있어서 주변 환경 요인과 측정자의 오차 등으로 인해 실측값과 다소 오차가 발생하였다. 본 연구에서는 측정수가 많지 않아 차후 연구에서 좀 더 많은 데이터를 이용하여 분석할 필요가 있다.