• 대한치주과학회:학술대회논문집
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• 2007.11a
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• pp.150-151
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• 2007

• Proceedings of the Korean Aquaculture Society Conference
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• 2005.05a
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• pp.143-144
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• 2005

• Proceedings of the Korean Aquaculture Society Conference
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• 2004.05a
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• pp.270-271
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• 2004

• Electric Engineers Magazine
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• v.218 no.10
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• pp.25-32
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• 2000

유효전력, 리액티브 전력 및 피상전력은 역률 보정을 나타내기 위하여 보통 사용하는 전력 삼각형의 세가지 요소들이다. 킬로와트로 측정되는 유효전력은 유효한 일로 직접적으로 변환되는 전력이며 Volt-Amepere Reactance 또는 Kilo Volt Amp Reactance로 측정되는 무효전력은 모터와 같은 유도성 부하의 구동을 위해 필요한 전기자기장을 발생하기 위한 전기 에너지이다.

• 대한생식의학회:학술대회논문집
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• 2002.05a
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• pp.62-63
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• 2002

• 전기의세계
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• v.13 no.2
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• pp.23-33
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• 1964

본 고에서는 계통이 비교적간단하고 부근에 용이하게 유도전압을 측정할 수 있는 통신선이 병행한 22kV 남양계통(수원-남양)을 선택하여 직접접지와 비접지시의 이상현상을 측정 비교하였다. 여기서 외국의 직접접지방식 채택에 대한 경향을 보면 미국은 직접접지가 압지적으로 많으며 구주 각미에서도 직접접지가 우리나라에서 보다 훨씬 많이 실시하여 장시일의 운전실적을 갖고 있다.

• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.106-109
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• 2003

기존 휠체어에 정지상태 유지의 의미를 가지고 있는 휠체어 브레이크 장치를 대체할 수 있으며, 안정적인 제동력을 제공함으로 운행 중에 제동할 수 있는 휠체어 제동장치의 설계 및 제작을 목적으로 한다. 장치를 설계, 제작함에 있어 설계단계에서부터 가공기술자가 참가함으로서 공정변화를 유도하였다. 또한, 외측라체트 휠을 이용한 제동장치를 제작함으로서 기존의 설계제작에 따른 시행착오를 줄였다.

• Journal of the Korean Society for Nondestructive Testing
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• v.31 no.4
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• pp.367-373
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• 2011

Guided waves inspection techniques that are different with inspection technique by bulk waves are widely used in pipe line evaluation due to advantages of long distance inspection. However, most of pipe lines at industrial fields are buried and/or coated. In this case, due to the attenuation effect from soil and/or coating material, there are a lot of difficulty on inspection by conventional ultrasonic technique. In this paper, guided waves propagating patterns are calculated with respect to excitation mode by Normal Mode Expansion(NME). Guided waves patterns based on excited by single transducer and guided wave focusing technique have employed to analyze focusing pattern on a pipe. A longitudinal mode and high order flexural modes are used with various number of transducers to determine sensitivity. Guided waves energy excited by multi transducer with focusing algorithm was successfully focused at a desired point.

• Tunnel and Underground Space
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• v.21 no.3
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• pp.235-243
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• 2011

In this study, a control blast method, which utilizes crack guide holes, is suggested to achieve smooth fracture plane and minimize blast damage zone (BDZ) in smooth blasting. In order to verify the effectiveness of crack guide holes on the fracture plane control in blasting, fracture process analyses which consider regular smooth blasting and guide hole smooth blasting had been conducted and the fracture planes resulting from the analyses had been compared. The analyses models considered the ignition of the blast holes using detonation cords and each guide hole placed between blast holes. From the results, the smooth blasting utilizing guide holes showed lower fracture plane roughness than regular smooth blasting method in the hole spacing range between 20 to 40cm.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.2
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• pp.147-152
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• 2014

A longitudinal modal transmission-line theory(L-MTLT) to analyze the static and dynamic behavior of two-section distributed feedback (DFB) lasers is used. The characteristic impedance and equivalent propagation constant of DFB structure with active layer are derived from L-MTLT. A two-section DFB laser is analogous to a transmission-line network, in which each section is described by transmission-line block corresponding to the equivalent factors. The longitudinal resonant condition of DFB laser based on equivalent transmission-line network is used to reformulate the rate equations so that static and dynamic behavior of two-section DFB lasers with active layer is demonstrated and analyzed accurately.