• 한국화재소방학회논문지
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• 제20권1호
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• pp.43-49
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• 2006

본 논문은 조명설비 중 220V/100W 백열전구의 온도특성과 화재분석에 관하여 연구하였다. 백열전구의 발열에 의한 발화가능성을 실험한 결과 정상상태에서는 최고 $161.9^{\circ}C$로 측정되었다. 밀폐된 공간에서 축 열이 되면 약 $538.1^{\circ}C$까지 상승하는 것으로 나타났다. 유리구를 파손하였을 경우 필라멘트는 공기 중에서 용단되었다. 외부 열에 의한 경우 전구 내부의 가스가 약한 부분으로 분출되었다. 따라서 백열전구는 산소의 공급이 원활하면서 폐쇄된 공간에서 화재의 가능성이 높으며, 가연성 물질 등이 주변에 있다면 화재 가능성이 매우 높은 것으로 나타났다. 백열전구의 외형변화, 재료특성의 변화 등을 통해 화재원인을 규명하는 중요한 자료로 이용될 것이 기대된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 전기설비전문위원
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• pp.18-22
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• 2009

In this paper, we are develop specifications light-way lighting appliance for efficient construction. Analyzed wide application and connection regulation. Also, flickering circuit Presented separation, arrangement, mounting instruction. Incandescent lamp occurs much heat. Therefore, establishment of enough electric light interval is required. Voltage of discharge lamp does by below 300v, and provide so that a person is not can may touched.

• 수산해양기술연구
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• 제45권2호
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• pp.85-95
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• 2009

The fishing lamp is a fishing gear that gathers fish at night. But the cost of oil, which is used to light fishing lamp, has been risen significantly up to 30-40% of total fishing costs. Therefore it is very urgent to develop an energy economical fishing lamp in order to solve the business difficulties of fisheries. Under this background, this research aims at developing a fishing lamp for squid jigging and hairtail angling fishery using the LED, which has excellent energy efficiency and durability. The LED fishing lamp developed can be controlled to fix a fit direction of fish shoal deep because a fishing lamp can be adjustable up and down directions. One unit of fishing lamp has about an 80Watt capacity and the frame of fishing lamp is made of aluminium to emit generated heat of LED to outside. The LED lamp developed was highly durable, only 5.7% of emitting efficiency decreased for 18 months. The illuminance of a unit LED lamp was 2,070lux at 1m and 21lux at 10 m distance, and the intensity of LED lamp system emitted 2,580lux and 400lux at the respective distances. After development of this fishing lamp, 100 units are installed on operating fishing vessels. Experimental results show that energy consumption of squid jigging and hairtail angling was reduced by 40% and 87%, respectively. In conclusion, our methods showed elevated fishing power, compared with traditional fishing method: 37.7% for squid jigging and 24.5% for hairtail angling.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 추계학술대회 논문집 전기물성,응용부문
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• pp.293-295
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• 2004

PLS(Plasma Light System) is one of the electrodeless lamp discharged by micro wave. In this new lamp has high efficacy and CRI(Color Rendering Index). It is mainly composed of microwave part and optical part. Microwave parts consist of magnetron, wave-guide and cavity-mesh, while optical parts consist of bulb, mirror and reflector. In this paper, we studied experimentally the heat-resistance and temperature distribution characteristics of bulb in PLS.

• 한국전산유체공학회지
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• 제18권1호
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• pp.63-68
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• 2013

The purpose of this study is to investigate the cooling performance of radial heat sink used for high power LED lightings by natural convection cooling with surrounding air. Experimental and numerical analyses are carried out together. Parametric studies are performed to compare the effects of geometric parameters in radial heat sink such as the number of fins, fin height, fin length, and thickness of fin base as well as the surface coatings of radial heat sink. In this study, the cooling of 60 W LED lamp is examined with radiative heat transfer considered as well as natural convection. Numerical results show the optimum condition when the number of fin is 40, heat sink height is 120 mm, fin length is 15 mm, and fin base thickness is 3 mm. The difference in temperature of the LED metal PCB is within $1^{\circ}C$ between numerical analyses and experimental results. Also, the CNT coating on the heat sink surface is found to increase the cooling performance significantly.

• Design & Manufacturing
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• 제10권3호
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• pp.14-19
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• 2016

Thermally or electrically conductive filler reinforced polymer composites are extensively being developed as the demand for light weight material increases rapidly in industiral applications need good conductivity such as heat sink of the electronics or light. Carbon or ceramic materials like graphite, carbon nanotube or boron nitride are typical conductive fillers with good thermal or electical conductivity. Using these conductive fillers, the polymer composites in the market show wide range of thermal conductivity from approximately 1 W/mK to 20 W/mK, which is quite enhanced considering the thermal conductivity lower than 0.5 W/mK for most polymeric materials. The practical use of these composites, however, is yet limited to specific applications because most composites are still not conductive enough or too difficult to process, too brittle, too expensive for higher conductivity. For practical use of conductive composite, the thermal conductivity required depending on the heat releasing mode are studied first for simplified unit cooling geometry to propose thermal conductivities of the composites for reasonable cooling performance comparing with the metal heat sink as a reference. Also, as a practical design for heat sink based on polymer composite, composite and metal sheet hybrid structures are investigated for LED lamp heat sink and audio amplication module housing to find that this hybrid structure can be a good solution considering all of the cooling performance, manufacturing, mechanical performance, cost and weight.

• 한국자기학회지
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• 제11권2호
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• pp.78-83
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• 2001

The thermal characteristics of TMR devices by using Fast Linear Annealing method has been studied. A computer program that employs the finite differential method has been developed to simulate the temperature distribution of a diameter of 4" silicon wafer, which is subjected to radiation heat from the halogen lamp. We adopted the temperature of 350$\^{C}$, which is the highest temperature usually used in annealing for magnetic thin films. We changed moving velocity of the lamp from 0.05 mm/sec to 1 mm/sec. The moving velocity of halogen lamp has less effect on the local peak temperature of the sample only about 40$\^{C}$. Therefore, we may be able to anneal TMR devices in such short time of 1 minute and 40 seconds per one wafer, using the Fast Linear Annealing method.

• 한국조명전기설비학회지:조명전기설비
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• 제4권2호
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• pp.41-45
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• 1990

기존의 고압 나트륨 램프의 I플라즈마 진단은 온도와 압력의 한 주기간의 평균값만을 구하고 있다. 그러나 고압 나트륨 램프의 플라즈마는 열관성이 작으므로 플라즈마 상태의 시간에 대한 변화가 크다. 그러므로 플라즈마 상태의 시간에 대한 변화를 진단할 필요성이 크다. 본 연구에서는 Na D선의 스팩트럼을 순서치로 측정하고 이를 해석하여 시간에 따른 플라즈마 상태를 구하는 spectroscopy에 의한 시변 진단 기법을 제안하고 있다.

• 한국정보전자통신기술학회논문지
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• 제10권6호
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• pp.487-495
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• 2017

무전극 램프의 열특성은 램프의 설계와 성능을 결정하는 주요 요소 중 하나이다. 커플러는 열에 의해 임피던스 특성이 변화하며 그 사용온도가 보통 약 $150^{\circ}C$ 이내이다. 본 연구에서는 지금까지 논외였던 $150^{\circ}C$ 이상의 온도에 커플러가 노출되었을 때의 현상에 대해 관찰하였다. 벌브의 안쪽 내관과 커플러와의 이격거리가 다른 두 종류의 커플러 A와 커플러 B에 대해 방열 조건과 열 차단 조건을 달리하여 전기적 특성, 열적 특성, 광학적 특성과의 연계성 및 열화 특성 등을 분석하였다. 우선 시스템의 임피던스를 구하여 이를 통한 전기적 특성을 분석하는 기준으로 삼았다. 두 종류의 커플러의 직경차는 1mm이며, 실험 결과에서 커플러의 직경이 1mm 작아서 발생하는 자계강도의 손실을 상쇄할 수 있는 조건을 찾을 수 있었다. 따라서 이러한 결과를 토대로 커플러가 약 $200^{\circ}C$의 고온에 노출될 때, 이에 대응하는 효율적인 설계 방안을 제시하였다.

• Design & Manufacturing
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• 제13권2호
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• pp.1-5
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• 2019

In this study, micro cellular injection molding of automobile head lamp housing with uneven thickness structure was performed to obtain improvement on deformation and light-weight of the part. The thickness of the presented model was uniformly modified to control the deformation of the molded part. In order to maximize the lightweight ratio, the model having an average thickness of 2.0 mm were thinly molded to an average thickness of 1.6 mm. GFM(Gas Free Molding) and CBM(Core Back Molding) technology were applied to improve the problems of the conventional foam molding method. Equal Heat & Cool system was also applied by 3D cooling core and individual flow control system. Warpage of the molded parts with even cooling was minimized. To improve the mechanical properties of foamed products, complex resin containing nano-filler was used and variation of mechanical properties was evaluated. It was shown that the weight reduction ratio of products with light-weighted injection molding was 8.9 % and the deformation of the products was improved from the maximum of 3.6 mm to 2.0 mm by applying Equal Heat & Cool mold cooling system. Also the mechanical strength reduction of foamed product was less than 12% at maximum.