• International journal of advanced smart convergence
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• 제5권3호
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• pp.66-71
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• 2016

Smart building gate security control system using smartphone integrated with near field communication (NFC) has become part of daily life usage these days. The technology change in replacing RF NFC device using visible light communication technology based approach growing faster in recent days. This paper propose a design and development of gate security control system using color code based user authentication ID generation as part of an intelligent access control system to control automatic door open and close. In this approach gate security access control use the recent visible light communication technology trends to transfer the user specific authentication code to door access control system using color code on smartphone screen. Using a camera in the door access control system (ACS), color codes on smartphone screens are detected and matched to the database of authenticated user to open the door automatically in gate security system. We measure the visual light communication technology efficiency as a part of the research and the experiments have revealed that more than 95% users authenticated correctly at the suggested experiment environment on gate security control system.

• Journal of Power Electronics
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• 제16권5호
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• pp.1843-1850
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• 2016

This study focused on predicting the fatigue life of an insulated gate bipolar transistor (IGBT) power module for electric locomotives. The effects of different wiring technologies, including aluminum wires, copper wires, aluminum ribbons, and copper ribbons, on solder fatigue life were investigated to meet the high power requirement of the IGBT module. The module's temperature distribution and solder fatigue behavior were investigated through coupled electro-thermo-mechanical analysis based on the finite element method. The ribbons attained a chip junction temperature that was 30℃ lower than that attained with conventional round wires. The ribbons also exhibited a lower plastic strain in comparison with the wires. However, the difference in plastic strain and junction temperature among the different ribbon materials was relatively small. The ribbons also exhibited different crack propagation behaviors relative to the wires. For the wires, the cracks initiated at the outmost edge of the solder, whereas for the ribbons, the cracks grew in the solder layer beneath the ribbons. Comparison of fatigue failure areas indicated that ribbon bonding technology could substantially enhance the fatigue life of IGBT modules and be a potential candidate for high power modules.

• 전자공학회논문지A
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• 제30A권11호
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• pp.105-112
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• 1993

Oxide and reoxidized-nitrided-oxide were formed by furnace oxidation and rapid thermal processing (RTP). MOS capacitor and n-MOSFET's with those films as gate insulators were fabricated. The electrical characteristics of insulators were evaluated by current-voltage, high-frequency capacitance-voltage (C-V), and time-dependent dielectrical breakdown (TDDB) measurements. The hot carrier effects of MOSFET's were also investigated. Time-dependent dielectrical breakdown (TDDB) characteristics show that the life time of reoxidized-nitrided-oxide films is about 3 times longer than that of oxides. Hot carrier effects reveal that the life time of MOSFET's with reoxidized-nitrided-oxides is about 3 times longer than that of MOSFET's with oxides. Therefore, it is found that the reliability of dielectric films estimated by the hot carrier effects of MOSFET's is consistent with that of dielectric films from TDDB method.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.542-545
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• 2002

This paper deals with the optimization inverter design and minimization Conduced EMI noise by customizing IPM(Intelligent Power Module). Generally, In case of IPM, we realized that the trade-off relation between switching loss and spike voltage. Higher gate resistor causes tile lower spike voltage and the higher turn-off switching loss. But we know that the life cycle of inverter and the susceptibility of noise, so we optimized the gate resistor. Proposed method is that optimized the gate resistor suitable for the inverter and motor. The simulation and experimental results show that the spike voltage and Conduced EMI noise can be reduced without the additional circuit.

• 대한지구과학교육학회지
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• 제4권3호
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• pp.251-257
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• 2011

This study aims to analyze the influence of parents' nurturing attitude on the children's self-esteem by comparing and analyzing the self-esteem of target children of gifted and talented education (GATE) and nongifted children with parents' nurturing attitude. The targets of this study are total 656 children in total. This study can be summarized as below. First, the self-esteem of target children of GATE turned out to be higher than that of nongifted children in overall, social, domestic and school life. Second, the nurturing attitude of parents felt by the target children of GATE is, from both father and mother, more affectionate, autonomous, achievement-oriented and rational. The parents of target children of GATE are more free in communication and fathers are aggressively in education; compared to parents of nongifted children, they put more importance on the course of achievement and help their children's achievement with actual way compared to the parents of nongifted children. Third, the relevance between self-esteem and parents' nurturing attitude is different in sub-areas. The self-esteem at home is the most relevant with parents' nurturing attitude, and the self-esteem at school is more affected by other factors than by the parents' nurturing attitude.

• 한국안전학회지
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• 제31권2호
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• pp.70-75
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• 2016

Recently, coastal erosion has been widely in progress and the erosion level becomes also serious in the world wide, espeically in East Sea in Korea. Since it would threaten the life, economics and security risk, it is necessary to much comprehend the reason why coastal erosion has occurred according to the geographical characteristics. Meanwhile, analysis about hydrodynamics of the solitary wave such as tunami in swash zone is needed for the best management practice of coastal erosion. Solitary wave is nonlinear wave and can be reproduced in the laboratoy scale by openning suddenly a sluice gate with water head difference, of which methodology was found in the literature, since it could be simply determined by a significant wave height. Thus, in this sutdy the generation of solitary wave was experimentalized using the sluice gate. Experimental conditions were classified by angles of a beach slope, a water level in a beach slope and a difference of water level between in a headtank and a channel bed. Two kinds of dimensionless analyses based from experimental results in this study were presented; the first analysis indicates nondimensionalization between the wave height and the water level in a beach slope in order to investigate characteristics of solitary wave approaching the beach. The second shows the other nondimensionalization between dynamic pressure and static pressure on a beach slope to investigate the relationship between wave breaking and wave pressure. Under the same conditions as laboratory experiments, the numerical results computed with a SWAN model embedded in FLOW 3D were compared in terms of wave height, and pressure on the beach slope, which shows good agreement with each other. Overall results from this study could provide fundamental hydraulic data for the reliabile verification of numerical simulation results about coastal erosion in swash zone caused by solitary waves.

• 대한한의학원전학회지
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• 제20권1호
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• pp.85-102
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• 2007

Zhang thinks human life consists of body(形) and Shen(神 spirit). Body comes from Jing(精), Shen comes from Qi(氣). The common basic of body and Shen is Qi. Thus the elements of human life are Jing, Qi and Shen. Among the three life elements, Jing is the lowest level. To preserve Jing is the key to Life Care. To preserve Jing, we should rest body and Shen, and Shen rules body, so to rest Shen is necessary to preserve Jing. When Jing is full, it converts to Qi, and Qi converts to Shen. Shen is ruled by mind(心), so mind sould be quiet. There is a gate through which Jing and Qi pass. It is called Mingmen(命門), and it sould be closed tight to preserve Jing.

• 한국인터넷방송통신학회논문지
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• 제17권2호
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• pp.95-104
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• 2017

제주지역에 산재된 정목(錠木)올레와 드러누워 있는 세계 최대 피라미드인 묘(墓)의 신문(神門)올레를 조사하고 제주인의 풍속 Protocol을 현대 과학과 접목시키는 Link를 구성했다. 3개의 이승 정낭과 2개의 묘(墓)의 저승 신문(神門)은 올레길 공간체로 연결되어 있다. 그 공간체에는 삶과 죽음사이의 상생(相生)과 상극(相剋)이 공존하는 상보성(相補性)(complementarity) 원리가 제주 문화(文化)에 숨어있다. 대(對)와 대(待)이다. 즉 반대되는 것은 서로 보완적이다. (Contraria Sunt Complementa 라틴어) 서로 대립하면서도 서로 의존하는 관계로 서로가 서로를 품은 관계를 뜻한다. 정낭은 통신 원리를 사용될 뿐 아니라 인체의 DNA Codon에 기본 원리으로 사용된다.

• Corrosion Science and Technology
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• 제7권6호
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• pp.328-331
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• 2008

Corrosion behaviour of water intake gate steel structures with different protective measures was investigated. Five material alternatives were taken for investigation, including: imported and recycled stainless steel, carbon steel with hot zinc spraying, painting and composite coatings. Results of corrosion rate for carbon steel, SUS 304, hot zinc spray coats in three water systems of Mekong river basin (saline, blackish and fresh) were also presented. Corrosion rate of carbon steel decreased with decreasing salinity in the investigated water environments. Meanwhile, these values for zinc coated steel, behaved by another way. Environmental data for these systems were filed and discussed in relation with corrosion characteristics. Method of Life Cycle Assessment (LCA) was applied in materials selection for water intake gate construction. From point of Life Cycle Cost (LCA) the following ranking was obtained: Zinc sprayed steel < Recycled stainless steel < Composite coated steel < Painting steel < SUS 304 From investigated results, hot zinc spray coating has been applied as protective measure for steel structures of water intake systems in Mekong river basin.

• 한국콘텐츠학회논문지
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• 제2권1호
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• pp.24-31
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• 2002

본 연구는 제천시 새주소 부여사업에서 추진된 새주소 부여를 위한 수치지도상의 건물 및 도로의 데이터베이스와 주출입구 조사 및 입력, 도로구간 설정, 도로명 제정 및 입력, 건물번호부여 등의 작업과정을 통하여 도시공간정보의 체계적인 관리와 활용을 위한 새주소 관리 시스템과 웹상에서 구현한 제천시 새주소 안내와 더불어 생활지리정보 등의 부가정보의 편리한 사용을 위하여 개발된 안내시스템에 대한 것이다. 본 연구를 통하여 지방 중소도시의 새주소 관리 및 안내시스템 개발과 구축은 클라이언트 서버 기반의 GIS 기능을 충분히 활용하여 관리시스템을 설계하고, 관리시스템과 동일한 데이터베이스로 안내시스템을 객체지향형으로 설계하여 WEB-GIS로 구현하여 새주소의 안내 및 생활지리정보서비스의 다양한 기능을 추가할 수 있도록 개발하였다. 그 결과로 제천시의 새주소 관리 및 안내시스템은 일반 시민이 쉽게 접근하여 생활에 필요한 다양한 정보를 손쉽게 이용할 수 있는 그 효용가치를 크게 높일 수 있었다.