• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.2658-2660
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• 2005

This paper presents a stator winding fault diagnosis technique of induction motor on the PC - based virtual instrumentation system designed using the graphical programming language LabVIEW. This method collects the 3-phase current signals using the current probe amplifier and PXI/DAQ system then the preprocessing removes the noise using LPF, after then this method transforms the stator current to Park's vector and obtains the each Park's Vector pattern and detects stator winding fault by comparing the obtained faulted pattern with the healthy pattern. This proposed LabVIEW based diagnosis system is applied to the 3 phase 1 hp induction motor and obtained the reasonable results under no load condition. The test results give us the possibility a simple and realistic on-line winding fault diagnosis system.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.193-193
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• 2008

Wearable and ubiquitous micro systems will be greatly growing and their related devices should be self-powered in order to avoid the replacement of finite power sources, for example, by scavenging energy from the environment. With ever reducing power requirements of both analog and digital circuits, power scavenging approaches are becoming increasingly realistic. One approach is to drive an electromechanical converter from ambient motion or vibration. Vibration-driven generators based on electromagnetic, electrostatic and piezoelectric technologies have been demonstrated. Among various generator types proposed so far, piezoelectric generator possesses considerable potential in micro system. To overcome low mechanical-to-electric energy conversion, the piezoelectric device should activate in resonance mode in response to external vibration. Normally, the external vibration excretes at low frequency ranging 0.1 to 200 Hz, whereas the resonant frequencies of the devices are fixed as constant. Therefore, keeping their resonant mode in varying external vibration can be one of important points in enhancing the conversion efficiency. We investigated the possibility of use of multi-bender type piezoelectric devices. To match the external vibration frequency with the device resonant frequency, the various devices with different resonant frequency were chosen.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 학술대회
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• pp.359-366
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• 2008

Current state and perspective of DNS of turbulence and turbulent combustion are discussed with feature trend of the fastest supercomputer in the world. Based on the perspective of DNS of turbulent combustion, possibility of perfect simulations of IC engine is shown. In 2020, the perfect simulation will be realized with 30 billion grid points by 1EXAFlops supercomputer, which requires 4 months CPU time. The CPU time will be reduced to about 4 days if several developments were achieved in the current fundamental researches. To shorten CPU time required for DNS of turbulent combustion, two numerical methods are introduced to full-explicit full-compressible DNS code. One is compact finite difference filter to reduce spatial resolution requirements and numerical oscillations in small scales, and another is well-known point-implicit scheme to avoid quite small time integration of the order of nanosecond for fully explicit DNS. Availability and accuracy of these numerical methods have been confirmed carefully for auto-ignition, planar laminar flame and turbulent premixed flames. To realize DNS of IC engine with realistic kinetic mechanism, several DNS of elemental combustion process in IC engines has been conducted.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년 추계학술대회논문집
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• pp.359-366
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• 2008

Current state and perspective of DNS of turbulence and turbulent combustion are discussed with feature trend of the fastest supercomputer in the world. Based on the perspective of DNS of turbulent combustion, possibility of perfect simulations of IC engine is shown. In 2020, the perfect simulation will be realized with 30 billion grid points by 1EXAFlops supercomputer, which requires 4 months CPU time. The CPU time will be reduced to about 4 days if several developments were achieved in the current fundamental researches. To shorten CPU time required for DNS of turbulent combustion, two numerical methods are introduced to full-explicit full-compressible DNS code. One is compact finite difference filter to reduce spatial resolution requirements and numerical oscillations in small scales, and another is well-known point-implicit scheme to avoid quite small time integration of the order of nanosecond for fully explicit DNS. Availability and accuracy of these numerical methods have been confirmed carefully for auto-ignition, planar laminar flame and turbulent premixed flames. To realize DNS of IC engine with realistic kinetic mechanism, several DNS of elemental combustion process in IC engines has been conducted.

• 한국컴퓨터정보학회논문지
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• 제16권4호
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• pp.197-204
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• 2011

이 연구에서는 입체 영상 기술을 사용한 모의 면접 시뮬레이션 시스템을 개발 및 구축하였다. 이 연구에서는 문항별로 제작된 입체 영상을 매끄러운 재생 기법을 사용하여 재생함으로써 실제감을 높였으며, 면접관의 실사 영상을 사용하여 면접자의 신뢰감을 향상시켰다. 또한 문제은행 형식의 실시간 면접 문항 구성 기능을 구현하여 다양한 면접 상황에 대한 훈련이 가능하도록 하였다. 개발된 시스템은 모의 면접 실시에 따른 인력과 시간, 장소, 그리고 비용을 절감할 수 있으며, 각종 인력 관리 서비스 및 공공 기관에서의 활용과 향후 어학 분야 등 다양한 아이템으로 이용이 가능하다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.181-186
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• 2003

There are many uncertainties in structural failures or structures, so probabilistic failure cause assessment should be performed in order to consider the uncertainties. However, in many cases of forensic engineering, the failure cause assessments are performed by deterministic approach though number of uncertainties are existed in the failures or structures. Thus, deterministic approach may have possibility for leading to unreasonable and unrealistic failure cause assessment due to ignorance of the uncertainties. Therefore, probabilistic approach is needed to complement the shortcoming of deterministic approach and to perform the more reasonable and realistic failure cause assessment. In this study, reliability-based failure cause assessment (reliability based forensic engineering) is performed, which can incorporate uncertainties in failures and structures. For more practical application, the modified ETA technique is proposed, which automatically generates the defected structural model, performs structural analysis and reliability analysis, and calculates the failure probabilities of the failure events and the occurrence probabilities of the failure scenarios. Also, for more precise reliability analysis, uncertainties are estimated more reasonably by using bayesian approach based on the experimental laboratory testing data in forensic report.

• 대한토목학회논문집
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• 제8권2호
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• pp.51-58
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• 1988

철근(鐵筋)콘크리트 설계(設計)를 위하여 강복선이론(降伏線理論)을 이용하는 경우에는 강복선(降伏線)을 따라서 발생(發生)하는 과도(過度)한 모멘트분배(分配)로 인하여 국부적(局部的)인 파괴(破壞)가 일어날 수 있다. 주열대(柱列帶)의 중간대(中間帶)의 소성저항(塑性抵抗)모멘트를 하나의 매개변수(媒介變數)를 이용하여 다르게 취하므로써 이러한 국부적(局部的) 파괴(破壞)를 줄일 수 있는 강복선이론(降伏線理論)에 의한 해석공식(解析公式)이 제안(提案)되었다. 또한 강복선이론(降伏線理論)에 의한 해석공식(解析公式)에 포함되어 있는 여러 가지 매개변수(媒介變數)들의 이상적(理想的)인 값을 제안(提案)하므로써 강복선법(降伏線法)에 의한 철근(鐵筋)콘크리트 슬래브의 설계(設計)를 보다 용이하고 합리적(合理的)으로 실시할 수 있게 하였다.

• 한국염색가공학회지
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• 제20권1호
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• pp.44-47
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• 2008

Organic semi-conductive materials have characteristics such as the advantages of easy formability, low-cost and diversity along with moderate semi-conductive properties. In this paper, we developed a flexible organic-inorganic hybrid solar cell fiber. First, we made a solar cell on the glass and attached the solar cell on the glass fiber similarly. In the latter case, thermal deposition method was employed in order to effectively apply ITO onto fiber surface. The amount of ITO was controlled by varying the temperature from 25, 150 to $300^{\circ}C$. Optimum result was obtained at $150^{\circ}C$ where maximize the deposition amount without significant decomposition of ITO. Despite of maximum open circuit voltage of 0.39V, the resulting current was quite unstable and weak, limiting realistic applications. It was, however, concluded that the flexible solar cell fiber developed showed a possibility of low-weight application from functional clothing for military to space suit mainly due to flexibility and thus wear ability.

• 디지털융복합연구
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• 제10권11호
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• pp.595-601
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• 2012

서사예술이 주로 인간에 대하여 사실적이고 가능성 있는 허구를 서술한 것이라고 볼 때 인물은 서사의 핵심구조이며 작중세계를 구축하는 가장 중요한 요소이다. 또 서사구조의 이야기를 성립시키면서 구성을 이끄는 행위의 주체이다. 이러한 관점에서 인물의 제시는 작가의 작품에 대한 기본적 태도이며 드라마 자체에 질서를 부여하는 작업이기 때문에 드라마의 미학적 구조는 결국 작중인물을 통하여 인식된다. 드라마를 미학적 쾌락과 미학적 이해의 정규 혼합물이라고 볼 때 작중인물을 통해 캐릭터를 창조하는 것은 서사구조에 대한 본질을 연구하는 지름길이 된다.

• 한국콘텐츠학회논문지
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• 제10권1호
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• pp.230-238
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• 2010

1960년대 이후, 촬영된 이미지가 사실 혹은 진실을 드러내주기보다는 진실과 유사한 '사실적 환상'을 제공한다는 인식과 더불어 진정한 사실성의 추구를 위한 이론과 실험이 계속되어 왔다. 국내에서도 이러한 동영상 매체의 유사진실성 문제에 대해 어느 정도 인식의 공유는 이루어지고 있으나, 문제는 이러한 인식이 제작으로까지 이어지는 예가 적다는 것이다. 본 논문에서는 다큐멘터리 장르에 있어서 유사진실성의 문제를 일으키는 '봉합' 작용을 최소화 하고 리얼리즘을 구현하는 하나의 대안적 방법으로 외화면에 주목할 것이다. 외화면의 활용을 통하여 리얼리즘을 구현한 사례들을 분석함으로써 다큐멘터리 제작의 끊임없는 화두라 할 수 있는 '사실성' 혹은 '진실성'의 문제에 근접할 수 있는 대안적 가능성으로서의 외화면 활용 방법을 제안하고자 한다.