• Proceedings of the KIEE Conference
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• 2006.04a
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• pp.231-233
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• 2006

Arc Fault Current is an electric discharge which is occurred in two opposite electrode. In this paper, arc current control algorithm is designed for the interruption of arc fault current which is occurred in the low voltage network. This arc is one of the main causes of electric fire. General arc current sensor has troubles for detecting arc currents, thus we would like to propose the arc current detection method without current sensor. In this paper, arc discharge currents within power lines are being detected through the arc current control algorithm.

• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.98-100
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• 2007

DC Arc Fault Current is an electric discharge which is occurred in two opposite electrode. In this paper, DC arc detection device is designed for the display of DC arc fault current which is occurred in the local electric network with DC Power. This DC arc is one of the main causes of electric fire. Arc fault in electrical network has the characteristics of low current, high impedance and low frequency. DC Arc current detection device is designed for the display of arc fault current which has the modified arc characteristics.

• 한국전산유체공학회:학술대회논문집
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• 2005.04a
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• pp.75-78
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• 2005

A numerical investigation has been performed to discuss the radiation-affected steady-laminar natural convection in an enclosure under a large temperature difference. Due to inherent nature of this study, the Boussinesq approximation is no longer valid. Therefore the radiating fluid in an enclosure is treated as a ideal gas. To examine the effects of thermal radiation on thermo-fluid dynamic behaviors in complex geometries, two incomplete partitions are introduced. Based on the results of this study, the dispositions of incomplete partitions with radiatively participating medium are found to incur a distinct difference in fluid-dynamic as well as thermal behavior.

• The Safety technology
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• no.200
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• pp.26-28
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• 2014

성남문화재단은 성남시의 문화예술 창작과 보급, 조사, 교류, 성남아트센터와 성남시민회관의 운영관리 등을 위해 지난 2004년 12월 창립됐다. 특히 재단 창립 이듬해인 2005년 성남아트센터에는 오페라하우스, 콘서트홀, 앙상블시어터 등 극장과 문화강좌를 위한 강의실이 개관돼 많은 사람들이 찾게 되면서 안전 문제에 대한 관심이 더욱 커졌다. 연중 공연이 끊이지 않는 이곳에서 유일하게 비수기라 할 수 있는 기간은 하계 휴가철이다. 많은 사람들이 바다와 산으로 여름휴가를 떠나면 공연장을 상대적으로 덜 찾게 되는 까닭이다. 이 때문에 성남아트센터의 안전점검도 7월과 8월에 집중 진행된다. 푹푹 찌는 여름철 어두운 무대 뒤편에서 안전점검이 한창인 성남아트센터를 직접 찾아가 공연무대시설의 안전은 평소 어떻게 관리되고 있는지 이야기를 들어봤다.

• 전기의세계
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• v.26 no.1
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• pp.87-90
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• 1977

Various simulation techniques were developed in the modeling of biological system during the last decades. Mostly analog and hybrid simulation techniques have been used. The authors chose the Digital Analog Simulation (DAS) technique by using the MIMIC language to simulate the saccadic eye movement system performances on the digital computer. There have been various models presented by many investigators after Young & Stark's sampled-data model. The eye movement model chosen by the authors is Robinson's model III which shows the parallel information processing characteristics clearly to the double-step input stimuli. In the process of simulation, the parameter and constants used were based on the neurophysiological data of the human and animals. The analog model blocks were converted to the corresponding MIMIC block diagrams and programmed into the MIMIC statements. The program was run on the CDC Cyber 72-14 computer. The essential input stimulus was double-step of 5 and 10 degrees, and target durations chosen were 50,100 and 150 msec. The results obtained by the DAS technqiue were in good agreement with analog simulation carried out by other investigators as well as with the experimental human saccadic eye movement responses to double-step target movements.

• Proceedings of the KIEE Conference
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• 2002.11c
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• pp.387-390
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• 2002

In this paper, arc current control algorithm is designed for the interruption of arc fault current which is occurred in the low voltage and low current network. Arc in electrical network have the characteristics of low current, high impedance and high frequency. Conventional controller does not have the arc current interrupt function. Hence, In this paper, arc current control algorithm is designed for the interruption of arc fault current.

• Proceedings of the KOSOMBE Conference
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• v.1989 no.05
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• pp.67-69
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• 1989

In this paper, principles of Rhcoencephalography(RBG) was described and RBG was designed and developed. Using the developed instrument, RBG waveforms of the left and right brain, RBG waveform changes by posture, were observed. It was found that RBG waveforms could be observed noninvasively. RBG can be easily applied for testing the effect of various drugs related to CBF(Cerebral blood flow) since it is quite sensitive to the relative changes of CBF. Various cerebral diseases can be diagnosed by analyzing the RBG waveforms. The area of restricted cerebral blood vessels can be located by arranging the appropriate electrode configuration.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.707-710
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• 1996

During King Sejong's reign in early Chosen Dynasty, the Korean science had been in full bloom. Among the many splendid achievements of the period, though most of them are not extant, astronomical instruments and clocks made for equipping the Royal Observatory are taken as typical works that reflect the characteristics of the King's scientific projects and discussed in the view point that what and how much a well-planned drive and a future-oriented leader can accomplish.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.702-706
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• 1996

The King Sejong's Striking water-clock was named for its distictive day and night time announcing system. Its time announcing system generates acoustic and visual signals for the twelve double hour, and combinations of two different acoustic signals for the five night watches, The mechanism of this signal generation system is triggered by a copper ball which is mechanically digitized time keeping signal, and is generated from the water clock. The time announcing system consisted four parts: 1) the mechanical amplifier which changes small copper to heavy steel ball, 2) day time announcing system, 3) night time announcing system, 4) sounding mechanism. The time announcing system of King Seong's Striking Clepsidra is remotely related to the Arabic clock system, however, it does have world-widely distictive mechanisms of its era, such as mechanical amplifier, self-weight rachet mechanism, and resetable mechanical computer etc.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.1-10
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• 2009

Based on recent studies, the side resistance of rock socketed drilled shafts was affected by unconfined compressive strength of rock, socket roughness, rock types and joints, and initial normal stress. Especially, the socket roughness was affected by rock types and joints, drilling methods, and diameters of pile. In this study, a new roughness measurement system (BKS-LRPS, Backyoung-KyungSung Laser Roughness Profiling System) usable in water was developed. Based on the laboratory model tests, an EMD (Effective Measurement Distances) according to various turbidity was proposed as EMD=$1149.2{\times}T^{-0.64}_b$.