• Journal of the Korean Society of Safety
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• v.25 no.1
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• pp.93-101
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• 2010

As safety-related regulations for signaling systems are standardized to IEC 61508/62278/62425, and others at the international level, safety activities and its assessment are required to be performed. And also there is the need to develop technologies for safety improvement to secure safety signaling systems in terms of technologies for safety activities on each life-cycle. In this paper we have developed the safety activity processes and technologies each steps of proposed processes respectively for railway signaling systems. And the proposed process and technologies are applied to the safety activities for mock-up signaling systems.

• Annual Conference of KIPS
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• 2002.11c
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• pp.1733-1736
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• 2002

웹사이트들의 급성장과 더불어 사용자들에게 유용한 정보를 제공하기 위해 대규모 웹사이트의 갱신 문제는 그 신선도 유지를 위해 적절한 시간 내에 요청된 갱신질의어를 수행하기 위한 많은 연구들이 진행되어 왔다. 본 논문에서는 동적, 반동적, 정적 웹사이트의 베이스데이터들을 통함 관리하도록 설계 및 구현을 하였다. 웹사이트의 신선도 유지와 기아상태의 공정성을 유지하기 위해 요청된 갱신질의어 실행시간 할당을 위한 목표 갱신비율을 일정한 스케쥴링 주기마다 재계산하는 스케쥴링 알고리즘을 구현하였다.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2006.05a
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• pp.269-272
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• 2006

The hydroforming processing is a relatively new technology in comparison with conventional stamping process. The hydroforming processing makes torsion beam in rear suspension of automobile. The durability of torsion beam is very important characteristic that operate in an automobile. In order to optimize the hydroforming process and satisfy the durability, the hydroforming simulation which could control an axial compression and high internal pressure with computer simulation has to be operated. This paper is about an optimum design to improve the kinematic and compliance characteristics of a torsion-beam of suspension system. The result from finite element analysis shows that the forming and the durability are optimized. If there is effect of First pressure in hydroforming processing that gap is in the die tool, the prototype of tube is not satisfied on the durability test.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.6
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• pp.195-208
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• 2004

Histogram is a very useful method on various practical aspect. With increasing importance of simple calculation method and convenience, it became the basic method in digital image processing nowadays. However, basic limit of using histogram is losing spatial position information of pixels on image. This paper reanalyzes image by presenting histogram with spatial position information(spatial histogram). Also using that result, level order recursive median filter is realized. Presented recursive median filter showed much improved results on edge maintenance aspect compared to existing recursive median filter.

• The Bulletin of The Korean Astronomical Society
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• v.34 no.2
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• pp.66.1-66.1
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• 2009

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2002.04a
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• pp.37-43
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• 2002

녹색꽃양배추는 이용부위를 기준으로 할 때 화채류로 분류되어 화전을 수확대상으로 하며 화뢰의 발육적온은 15-18℃로, 재배시기가 고온에 가까워지는 초여름부터 초가을 수확의 작형에서는 화뢰형성 불량 등 이상화뢰의 발생이 많아지게 된다(Fujime와 Hirose, 1981). 특히 봄철 노지 재배에서는 15-25℃의 생육적온을 벗어나는 저온과 고온에 조우될 위험성이 크며, 생육초기의 저온과 후기의 고온이 품질저하의 원인이 되므로 (Takuya와 Tugio 1994), 무리한 조기정식을 피하고 가능한 6월 중순 이전에 수확을 마쳐야 한다. (중략)

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1364-1367
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• 2003

These days, spinal interbody arthrodesis using fusion cage is very popular. The cage used for the spinal interbody arthrodesis is mainly inserted from the posterior of the spine. Accordingly, there could possibly occur damages at posterior and results in instability of structure. Moreover, one or two cages are inserted depending on the patients. In this study, it is attempted to evaluate the stability quantitatively by comparing two cases where one and two cages are inserted. For this purpose, a very fine 3-dimensional finite element model of vertebra is generated from the MRI data. From this vertebra model, two models are made: one with one cage and the other with two cages. Finally, finite element analys is performed for these two models and both of the mechanical behaviors are examined In addition, the effect on the stability is evaluated and compared quantitatively.

• Journal of KSNVE
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• v.7 no.5
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• pp.757-764
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• 1997

The well-developed noise separatrion techniques are applied to the V8 RG8 Diesel engine for the engine noise reduction of a commercial vehicle. For various loads and engine RPM's, the contribution of the combustion oriented noise and the mechanically induced noise was calculated under the small variations of the injection timing. For the given Diesel engine the mechanical noise is dominant for low rpm, and the contribution of the combustion noise becomes greater as the rpm increases. The combustion noise is dominant around 2kHz range or under 50% loading condition.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2007.04a
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• pp.211-216
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• 2007

The objective of this paper is to present the results of an experimental and a finite-element investigation into the behavior of X80 grade pipes subjected to bending. For the pipe specimens comprising the test series, different D/t is applied to be representative of those that can be expected in the field. Results from the numerical models are checked against the observations in the testing program and the ability of numerical solutions to predict pipe moment capacity. curvatures. and buckling modes is established. A finite-element model was developed using the finite-element simulator to predict the local buckling behavior of pipes. The comparison between the numerical and the experimental results demonstrates the ability of the analytical model to predict the local buckling behavior of pipes when deformed well into the post-yield range.

• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.357-360
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• 2010

본 연구의 논의의 전개는 오늘날 산업사회의 발달로 인해 고도의 경제성장과 의료기술의 발달로 평균 수명이 늘어나고 이로 인한 인구 고령화 현상이 급속히 진행되고 있다. 이러한 논의를 토대로 고령화 사회에서 재가노인복지서비스가 제대로 이루어지기 위해서 본 연구는 재가노인복지서비스가 전문적인 서비스 수준으로 이어져야 한다고 보고 있다. 이에 따라 재가노인복지서비스의 필요성, 재가노인복지 사업, 문제점 등에 대해서 개괄적으로 살펴보고 우리나라 재가노인복지서비스의 과제와 개선방안을 모색해보고자 한다.