• 전자공학회논문지B
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• 제32B권1호
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• pp.73-84
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• 1995

New morphological positioning algorithm and inspection method are presented and compared with a method by means of the Hough transform. The positioning algorithm is the process of finding the center and the rotated angle of the surface mounted device (SMD). The inspection method is capable of detecting the location of broken or bent leads. In order to obtain the center and the orientation of the SMD rapidly, the Hough transform method utilizes feature points (concave points) and is executed on a DSP board. The proposed morphological method is implemented by using the morphological skeleton subsets, and an ultimate orientation is decided by the Hit-or-Miss transform (HMT). In the inspection process, two inspection methods also are presented. The first method utilizes the morphological methods, i.e., opening and closing. It is performed before the positioning process and called an initial inspection. The second method follows the positioning process and is performed by an inspection of intersections of rulers and the lead edge (or the skeleton). It is a ruling technique which is referred to as a detailed inspection. We find the morphological approach is preciser and faster than the Hough approach by the comparison of the proposed algorithms.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 가을 학술논문 발표대회
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• pp.97-98
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• 2022

The purpose of this study is to find out the failure conditions of fire doors in the process of use and prepare maintenance measures against them and find out the failure conditions and failure rates of fire doors according to the period of use of buildings. According to a survey of the failure rate and failure factor of fire doors, the failure rate of fire doors under 5 years was 3.7%, 13.4% of fire doors under 5 years and 10 years, and 14.8% of fire doors under 15 years and 27.6% of fire doors over 20 years. In particular, 15 years later, the failure rate of fire doors exceeded 20%. The main defects were found to be natural aging, holes, opening and closing failures, gaps, and failure and wear of accessories such as gaskets and door closers.

• 한국농촌건축학회논문집
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• 제6권1호
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• pp.54-63
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• 2004

Ecomuseum has changed for general museums with a strong historical connotation, and more identity museums, which reminds one of their purposes of providing evidence, conserving and remembering. Small museums playa very important social role and have a level of importance which should do something to improve cultural policy. The "ecomuseum" phenomenon, in other words this spontaneous birth of numerous museums in local communities, this desire to retrace one's history and fix it in one's mind, has only one precedent in Italy. This precedent involved the opening of numerous museums dedicated to the "Risorgimento" and "Patriotic History", which, in the closing decades of the 19th century, were founded on political input all over the country, in big towns and little villages alike. Searching amidst the exhibits for the memory of a national identity and they are proof that local communities are filled with an unstoppable need to know about their roots and to reassess their own identities.

• 한국컴퓨터정보학회논문지
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• 제3권2호
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• pp.113-117
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• 1998

본 논문의 화상 처리 기법은 최근 다양한 기법을 적용하여 화상 및 문자 인식 방법에 대하여 효율적인 인식방안으로 많이 제시되고 있지만, 실제로 그 인식 분석 처리 과정이 매우 복잡함으로 인하여 충분히 반영되지 못하고 있는 한계성을 가지고 있다. 따라서 본논문에서는 모폴로지라는 단순 집합론적 기법, 즉 Erosion과 Dilation 그리고 Opening과Closing, Structuring Element를 적용하여 화상 인식의 유효성을 검증하고자 한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.812-815
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• 1997

A dynamic model of air circuit breaker with a spring-actuated linkage is derived, and its validation for analysis and design, particularly appropriateness for an analysis of high-speed motion behavior are checked through experiments. The dynamic model is developed through the modeling process based on ADAMS and Pro/Engineer. The simulation results of derived dynamic models for the rapid closing and opening operations are compared with actual responses using a high-speed camera and investigated to validate their usefulness.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1418-1421
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• 2003

The Vacuum circuit breaker is a kind of power circuit breaker and protect electric devices from over-current. In this paper we built a dynamic model of VCB driving mechanism using ADAMS. The development of the new circuit breaker with less energy and more compactable mechanism is focused. Through the dynamic model, the concept design of the new circuit breaker with less energy and more compactable mechanism is proposed, and then the detailed design is carried out through the design process based on the dynamic model.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.777-781
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• 1997

One of the spring-link mechanisms, the air circuit breaker(ACB), was studied to improve the shock-proof characteristics of it. The low-cycle fatigue fracture phenomenon was occurred on the critical link, called h-link, of ACB for the repeated rapid closing and opening operations. To analyze the cause of failure, dynamic FE-analysis on the h-link part of ACB was accomplished with considered the velocity and acceleration of the links per time as boundary conditions, which were obtained by using ADAMS. Then, to reduce the maximum tensile stress on the h-link, three types of h-link were suggested and one of them was selected. Fmm this study, we suggested the process of analysis on the high-speed motion behavior part related low-cycle fatigue fractures.

• 오토저널
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• 제13권3호
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• pp.25-31
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• 1991

The formation process of hydrocarbon emissions was investigated in SI engine. The time- resolved concentrations of hydrocarbon emissions were measured using a high gas sampling valve and a gas chromatography. The gas was sampled at exhaust port, or the position of spark plug, or the wall of combustion chamber. The experiments were conducted using the Alpha engine of Hyundai Motor Company. The fuel used was methanol or propane. It was found that the effect of the quenching layer of combustion chamber wall on hydrocarbon emissions was not significant. The increasing rate of hydrocarbon concentration at combustion chamber wall near crevice and oil layer after flame was reached was much higher than that at the position of spark plug. The hydrocarbon concentrations at exhaust port had two peak values just after opening exhaust valve and just before closing it.

• 대한기계학회논문집A
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• 제26권11호
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• pp.2355-2363
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• 2002

The accompanying paper, Part 1, has presented the physical modeling and basic numerical analysis results of both the flow-induced and thermally-induced residual stress and birefringence in injection molded center gated disks. The present paper, Part II, has attempted to investigate the effects of various processing conditions of injection/compression molding process on the residual stress and birefringence. The birefringence is significantly affected by injection melt temperature, packing pressure and packing time. Birefringence in the shell layer increases as melt temperature gets lower. The inner peak of birefringence increases with packing time and packing pressure. On the other hand, packing pressure, packing time and mold wall temperature affect the thermally-induced residual stress rather significantly in the shell layer, but insignificantly in the core region. Injection/compression molding has been found to reduce the birefringence in comparison with the conventional injection molding process. In particular, mold closing velocity and initial opening thickness in the compression stage of injection/compression molding process have significant effect on the flow-induced birefringence, but not on tile thermal residual stress and the thermally induced birefringence.

• 동의생리병리학회지
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• 제18권1호
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• pp.8-15
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• 2004

Hwangjenegyeng somun. Treatise on the parting and Meeting of Yin-Yang is the theory of the parting and meeting about Yin-Yang. It is harmonized treatise Yin-Yang and systemic constant. Taechung and Gwangmyeng are the concretely applied form of the parting and meeting of Yin-Yang at human body. The parting and Meeting of Three-Yin- Three-Yang has six types symbols of circulated Yin-Yang. They have Six-meeting space structure as match like up-down, backside and front-side, left-side and right-side. These pairs express symbolized meaning of creation of Saeng-jang-shu-chang and also apply the same things. Somum Treatise on the Parting and Meeting of Yin-Yang explains acting of human body by the parting and meeting of Three-yin-three-yang as six structures of Opening-covering-axis of Three-yin-three-yang. This principal is expression of the parting and meeting of Yin-Yang and concretes the opening and closing of circulation process for symmetry by each acting of Three-yin-three-yang. As result. the match of six-meeting in space structure and the Opening-covering-axis of Three-yin-three-yang are the basic principal of oriental medicine about the treatise of Gyeng-Lak and the treatise of Six-Gyeng of Sanghanlon.