• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.650-652
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• 2005

우리나라 가공배전선로는 가능한 한 직격뢰의 침입을 방지하기 위하여 차폐각이 $45^{\circ}$가 되도록 가공 지선을 설치하고 있으며, 이 경우에도 흡인공간이론에 따르면 수[kA] 정도의 뇌격은 차폐실패로 인하여 상도체에 직접 침입(직격)할 수 있으므로, 직격뢰에 의해 발생할 수 있는 뇌과전압의 실제 크기를 파악하는 것은 절연 설계나 절연협조에 있어 매우 중요하다. 본 논문에서는 차폐실패에 의해 가공배전선로의 상도체에 직격뢰가 침입한 경우에 발생하는 뇌과전압에 대하여, 실제의 선로와 동일한 구성과 규모의 실증선로를 이용하여 실증에 의해 고찰하였다.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.272-273
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• 2006

Recently KS standards being kept in step with IEC standard in electrical safety. This paper examines thermal parameters of KS C IEC 60364-5-523(2002) to calculating the ampacity of insulated cable at 1kV below.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.603-605
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• 2006

To reduce inference of any power delivery failures in underground power cable, power system operators are trying to find effective way of finding fault location as soon as possible. But it is very difficult to find fault location exactly for underground power cable. We are developing fault location system for underground power cable which can detect its fault location exactly. This new system monitors current and voltage of underground power cable by using low voltage and current sensors and if there are any accidents, it records its transient signal. Fault location is calculated by analyzing recorded signal. To develop fault location system for power cable, we needed fault simulation system and we installed it physically and tested. In this rapers, we describe on describe of fault location system for underground power cable.

• Proceedings of the KIEE Conference
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• summer
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• pp.467-469
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• 2004

When power cables cross regions with unfavorable thermal conditions, conductor temperatures higher than the design value can occur. This paper proposes the calculation algorithms of the permissible current-carrying capability using the algorithm of calculating the longitudinal conductor temperature distribution of power cables installed in thermally dissimilar soil materials.

• Proceedings of the KIEE Conference
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• summer
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• pp.470-472
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• 2004

This paper proposes a method of increasing the Permissible current carrying capability of underground power cables. A clue of this method is driven from the temperature distribution analysis processes according to the currents calculated from unequally mode algorithm in ampacity program.

• Journal of the Korean Applied Science and Technology
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• v.26 no.3
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• pp.233-239
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• 2009

A reaction device raising a generation yield by efficiently removing water generated in an esterified reaction between diethylene glycol monoethyl ether and succinic acid with mixture of an azeotropic point was newly developed as a new product in development of more stabilized emulsifier with a semi-solid phase(cream) in an emulsified phase of interfacial activity. The bis-(diethylene glycol monoethyl ether succinate(hereinafter, called as BDGS) with a high yield of more than 95% was obtained. As this has a property containing amphoteric emulsified functions such as W/O type or O/W type, etc., and has a merit that can be used regardless of any emulsified phase, there is no need using other emulsified surfactant. therefore, as this has excellent skin wetability in the cosmetics industry, a product having a wider range in quality compatibility or cost saving, etc. as a humectant has been developed.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.41-42
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• 2010

본 논문에서는 대면적 플라즈마 사인 보드 제어를 위한 저소비 전력용 인버터를 개발하였다. 이 인버터는 215*86mm 사이즈로 인가전압 220V, 출력전압 1200V, 스위칭 주파수 20KHz, 소비전력 50W 급인 인버터를 역률개선회로 PFC(Power Factor Correction)를 적용하여 리플을 줄이고 안정적인 전압 공급, 전체 전류 정격감소, 회생전압 상승분 억제, 유니버설 입력범위에서 동작 가능하게 만들었다. 고전압트랜스를 4개를 집적화 하였으며 전력 소비 전류가 감소되면서 온도가 상승되는 것을 막을 수 있었고 전자파도 줄일 수 있음을 보였다.

• Applied Chemistry for Engineering
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• v.10 no.6
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• pp.907-912
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• 1999

In this study, removal effect of residue pesticides on vegetable and fruit using organic acid salt in alkali solution were investigated by gas chromatography and measurement of detergency. Generally, for the removal methods of residue pesticides and oily pollution were used chemical detergent or organic solvent. Specially, in our experiment, we only used material of food additives and trisodium citrate were superior to other organic acid salt. It was investigated that removal effect of pesticides was superior to chemical detergent.

• Textile Coloration and Finishing
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• v.6 no.3
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• pp.67-73
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• 1994

The adsorption behaviors of acid dye and disperse dye on silk and nylon fabrics were examined, in one bath dyeing system on silk/nylon blend fabric with disperse dyes and acid dyes. In the dyeing of nylon fabric with C. I. Disperse Red 19 (Red 19) and C. I. Disperse Red 60 (Red 60), dye uptake of Red 19 was higher than that of Red 60. When silk/nylon blend fabric was dyed with Red 19 and Red 0, the dye uptake on nylon was influenced by the ffinity of the dye to the silk fabric. In the dyeing of silk/nylon with C. I. Acid Blue 80 and C. I. Acid Yellow 121, solid shade could not be obtained with the conventional method but could be obtained with the dyeing resist agent for nylon. There was not any relationship between K/S value and Munsell value, but Munsell value tended to change with the K/S value.

• Applied Microscopy
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• v.26 no.4
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• pp.479-487
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• 1996

Thin epilayer structures of GaAs/AlAs/InGaAs, grown by Molecular Beam Epitaxy, were investigated by high resolution transmission electron microscopy, Image in the [110] zone axis was taken and compared with the calculated images. The supercell structure which contains GaAs, AlAs and InGaAs layers was designed and was employed in the image calculation with MacTempas computer program. Good agreement was shown between experimental image and a set of calculated images with varying defocus and sample thickness.