• Applied Chemistry for Engineering
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• v.27 no.2
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• pp.210-216
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• 2016

In this paper, the electrical and resistance heating properties of carbon fiber heating elements with different electroless Ni-P plating times for car seat were studied. The specific resistance and specific heat of the carbon fibers were determined using 4-point probe method and differential scanning calorimetry (DSC), respectively. The surface morphology and temperature of carbon fibers were measured by scanning electron microscope (SEM) and thermo-graphic camera, respectively. From experimental results, the nickel layer thickness and surface temperature of carbon fibers increased with increasing the plating time. However, the specific heat and specific resistance decreased with respect to the increased plating time. In conclusion, the electroless Ni-P plating could improve the resistance heating and electrical properties of carbon fiber heating elements for car seat.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.05a
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• pp.19-22
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• 2003

The purpose of this study is to analyze the curing effect of planar surface heater for concreting in cold weather. Some experiments were conducted to evaluate the temperature history of concrete structures cured with heating sheets. Results are as follows ; (1) The temperature of concrete showed continuously rising trend with the heating by planar surface heater under the cold environmental condition of 3~-12$^{\circ}C$. And after about 24 hours the maximum temperature of concrete was reached at 25~3$0^{\circ}C$. (2) The temperature of slab concrete heated by planar surface heater of 130W/$m^2$ was at least $25^{\circ}C$ higher than that of an exterior air, and the curing performance was much more effective than heating by hot wind machine. (3) Through the curing by planar surface heater for 48 hours, the concrete maturity of about 1.5 times to heating by hot wind machine was acquired.

• Journal of the Korea Institute of Building Construction
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• v.3 no.2
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• pp.135-139
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• 2003

The purpose of this study is to analyze the curing effect of planar surface heater for concreting in cold weather. Some experiments were conducted to evaluate the temperature history of concrete cured with heating sheets in the laboratory conditions. As the results, It was showed that the 130W/$m^2$-heater could raise the inner temperature more than $20^{\circ}C$ under the environmental condition of -5~$-20^{\circ}C$. And the temperature of concrete cured by the 200W/$m^2$-heater was 5~$10^{\circ}C$ higher than that of concrete cured by 130W/$m^2$-heater. Finally, through the curing by the planar surface heater during the first 1.5~2 days, it is possible to secure the sufficient maturity of concrete.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.05a
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• pp.169-172
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• 2004

최근 LCD 노트북 제품의 고유한 특정인 경박단소가 요구되면서, 백라이트의 박형화로 인해 광원으로써 램프의 세경화에 대한 개발도 진행되고 있다. 특히, 노트북용 램프의 경우 발열이 심해 도광판을 비롯한 시트류의 주름현상이 발생하며, 수명연장을 위해서 전극의 표면적이 넓거나 일함수(work functuon)가 작은 재질의 개발이 필요하다. 따라서 노트북용으로 저발열, 장수명을 위한 램프를 개발하고 있으며, 본 연구에서도 기존 Ni 전극을 사용한 램프 대비 Nb, Mo, Ta 전극을 사용했을때 통일한 구동조건에서 103%의 휘도특성 개선을 확인할 수 있었고 수명면에서도 기존 Ni 전극 대비 일함수가 낮은 Nb, Mo, Ta 전극을 사용한 램프의 경우 시간경과에 따른 휘도저하가 낮은 것으로 나타났다.