• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.23.1-23.1
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• 2008

A space shuttle with a Prototype Synchrotron Radiation Detector (PSRD) was launched in 2001. PSRD was set in the Endeavour payloads and got data for 12 days. The purpose of PSRD is to measure synchrotron photons which are created by high energy charged particles near earth. Synchrotron photons are confused with background photons. We studied how to separate synchrotron photons from backgrounds.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06a
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• pp.303-304
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• 2010

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.583-583
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• 2006

• Journal of Physiology & Pathology in Korean Medicine
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• v.17 no.3
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• pp.585-594
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• 2003

Clinical observation on the diseases of Jang(臟) and Bu(腑) comes to the conclusions as follows: Variation in Jang(臟) and Bu(腑) exists diversely with every man because man is a microcosmos resembling the great universe, 'Mother Nature'. If the patient has a distinctive features of Jang(臟) and Bu(腑) in configuration, the diseas must be caused by the problems of Jang(臟) and Bu(腑). Distinctive features of Jang(臟) and Bu(腑) can be recognized by the shape and color of face, ear, eye, mouth and nose. Distinctive features of Jang(臟) and Bu(腑) should be examined preferentially when it comes to old people, children and persons who have past record of surgical operation on Jang(臟) and Bu(腑) organs.

• Plant Resources
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• v.3 no.2
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• pp.152-162
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• 2000

This study was performed to investigate the resources flora of Mt. ManRoi(611.7m; 37$^{\circ}$51'N, 127$^{\circ}$ 20'E), during April 1995 to September 1998. The vascular plants, which were collected from the mountain were composed of all 382 taxa including cultivated species, and classified into 1 phylum, 4 classes, 34 orders, 87 families, 254 genera, 323 species, 1 subspecies,55 varieties and 4 forms. There were not rare and endangered species, while 7 taxa of Korean endemic plants, that is, Tricyitis dilatata, Clematis trichotoma, Deutzia coreana, Spiraea prunifolia var, simpliciflora, Forsythia koreana, Weigela subsessilis and Patrinia sanicalaefalia were distributed in this mountain. The vegetation of this investigated area is regarded as the boundary of the temperate middle part and temperate southern part in floral zone of the Korean Peninsula.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.11a
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• pp.189-193
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• 2007

The grounding of an electrical system is one of the essential elements for public safety. Domestic practice of grounding system design has been to get grounding resistance values which are classified by facilities or equipment in the regulations. But the concept of grounding system design of IEC is, as a main factor of safety index, to consider touch voltage and step voltage instead of the resistance value itself. Recently IEC actively develops or revises safety related standards which are essential for the grounding system performance. In this paper, we present the recent trend of the international standards on the safety criteria for Electric Shock Protection.

• Proceedings of the KIEE Conference
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• 1992.07a
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• pp.63-66
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• 1992

This paper presents the real time digital differential protection scheme for transformer. Inrush and Internal fault conditions are distinguished by the relative magnitudes of fundamental and second harmonic components which are extracted from differential currents. The algorithm is simulated and implemented using a prototype relay which is made up of Intel 80286 CPU and Motorola DSP-56001. The testing data of inrush and Internal fault signals which are sampled at a rate of 12 times a cycle are obtained by EMTP, and tested In real time using simulator which downloaded those data.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1713-1717
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• 2008

We have developed a nanoparticle focusing mask which can generate particle arrays directly on the large area with high resolution. Using this mask, nanomaterials are precisely deposited onto desired positions on a substrate surface. We obtained various sizes of arrays ranging from 80 nm to 6 ${\mu}m$ with silver and copper nanoparticles that are generated by a spark discharge and an evaporation-condensation method. The feather size is much smaller than that of mask openings due to the focusing effects, like electrostatic lens, caused by charge or electric potential on insulator mask surface, which also prevent a mask clogging. The particle array size depends on the size of mask open patterns and focusing effects near the mask relate to ion flow rate and electric potential. We have demonstrated that diverse size of arrays with high resolution could be obtained repeatedly using the same sized mask in atmosphere.

• Proceedings of the KIEE Conference
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• 2002.11b
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• pp.154-156
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• 2002

PSS/E의 내부 시퀀스인 IPLAN을 이용하여 반복 조류계산을 함으로서 P-V, Q-V 곡선의 P, Q, V 값을 계산하는 IPLAN을 작성하였다. 작성된 곡선들은 유효전력 및 무효전력 예비력을 판단하는 지표, 전압안정도를 판별하는 지표 등 여러 방면에서 사용될 수 있다.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1320-1325
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• 2006

Railway track supports and guides train and it directly affects ride quality and safety. To maintain track quality, regular maintenance activity is essential but it degrades track usage since maintenance activity occupies the track during the work. To achieve maximum track efficiency, track inspection should be performed at commercial running speed. In this paper, we designed and developed high speed rail profile measurement system using laser light sectioning method with line laser generator, digital camera and DSP based image processing system. The measurement system can supports rail profile measurement at the speed of 300 Km/h that can be applied to KTX.