• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.770_771
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• 2009

본 논문에서는 전기강판의 2차원 교번자계 특성을 고려한 대형 영구자석 BLDC 모터의 자계 분포를 해석한다. 등방성 전기강판의 2차원 자기특성은 2차원 Single Sheet Tester를 이용하여 측정되었고, 그 결과는 확장된 B-H곡선 근사화방법을 통하여 유한요소 해석에 적용되었다. 제안된 유한요소 해석을 통하여 BLDC 모터에서의 자계 및 철손 분포가 해석되었고, 그 결과는 일반적인 유한요소 해석에 의한 결과와 비교되어진다.

• Journal of Welding and Joining
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• v.16 no.1
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• pp.98-105
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• 1998

The accuracy of the finite element method depends upon the mesh that is used in the analysis. The temperature around the arc is higher than the melting point of the materials, and it drops sharply in the regions just away from the arc. This requires an extremely fine mesh in the confined high temperature region to predict the temperature accurately in that region. But the computational time increases with the fineness of mesh. Since fine mesh is required only around the arc source, adaptivity of the input mesh according to the position of the arc source is efficient. The remeshing technique gives a fine mesh in the high temperature region around the arc and a coarse mesh in other region at any time step. With this it is possible to achieve desired accuracy with less computation time. In this study a transient adaptive mesh, remeshing technique, is developed and calculated temperature for a sample problem.

• Journal of the Korean GEO-environmental Society
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• v.13 no.10
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• pp.55-62
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• 2012

In this research, the algorithm for simulating specific grain size distribution(GSD) with large diameter granular material was developed using the distinct element analysis program $PFC^{3D}$(Particle Flow Code). This modeling approach can generate the initial distinct elements without clump logic or cluster logic and prevent distinct element from escaping through the confining walls during the process. Finally the proposed distinct element model is used to simulate large triaxial compression test of the rockfill material and we compared the simulation output with lab test results. Simulation results of Assembly showed very well agreement with the GSD of the test sample and numerical modeling of granular material would be possible for various stress conditions using this application through the calibration.

• The KIPS Transactions:PartC
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• v.11C no.6 s.95
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• pp.787-798
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• 2004

High performance net재rking is one of key factors to provide support for data intensive applications in the Internet. Extended frame size has a major impact on end to-end performance with increasing effective TCP throughput and decreasing system overhead. Most of the research about extended frames has focused on local area network performance and the impact that extended frame size has on the system elements including memory, network interface card and so forth. In the paper, we analyse the effects of the extended frames to the other traffic flows sharing Internet paths for the wide area performance of TCP by conducting various network simulations. Results show that securing available bandwidth in no loss and low delay networks is indispensable to exploit the efficiency of extended frames.

• Journal of Korean Society of Steel Construction
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• v.14 no.6
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• pp.835-843
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• 2002

The goal of this paper is to understand the stress-transfer mechanism of concrete-filled tubular column to H-beam connection with external T stiffener through the elasto-plastic finite element method and to offer basic data for the design of T stiffener. For the accuracy, analysis results are compared with experimental results. It makes use of several stress and strain indices to understand the stress-transfer mechanism of connection. An alternative plan that decreases the stress concentration of beam flange to horizontal stiffener connection is proposed through the elasto-plastic finite element method.

• Computational Structural Engineering
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• v.2 no.4
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• pp.69-77
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• 1989

Until recently post-processing of finite element model has been heavily relied on expensive graphic peripheral devices. With the aid of inexpensive microcomputers, very economical post-processor graphics program called MICRO-POST has been developed. Model geometry or results of analysis for the unlimited meshes can be easily presented in a number of low-cost graphic devices. The paper presents the procedure obtaining the device-independent graphics, and the structure and functions of the program. It also describes efficient I/O scheme to overcome the memory limitation, and dialogue-type input technique to control the plot operation in an interactive manner. Through the post processing examples for the general purpose finite element programs, it demonstrates the usefulness of the program.

• Computational Structural Engineering
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• v.7 no.3
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• pp.143-152
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• 1994

Superelement technique for structural analysis of large scale objects such as airplanes or vessels is effective especially in the harsh hardware environments. In this paper, a crane vessel of OHI 5000 which is capable of lifting 5000 tons in tie-backs and capable of revolving with 3000 tons is investigated in the view point of structural safety using superelements through the substructure scheme. Also an effective substructure procedure, a unique load extraction method and finite element modeling technique are demonstrated. Comprehensive reinforcement blueprints are derived based on the analysis results. Successful application of substructure technique is achieved through the structural analysis of the crane vessel. The analysis technique developed in this paper can be a guideline for similar large scale structures' relevant safety identification.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.147-150
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• 2021

최근 문화 산업에서 정치적 올바름 요소를 더욱 확장시키고 있는데 이러한 소수자 우대 정책이 작품내 맥락을 고려하지 않아서 부자연스럽고 역차별을 야기한다는 주장이 많다. 본 논문에서는 게임에 들어가는 정치적 올바름 요소에 대해 알아보고 설문조사를 통해 게임 사용자들의 의견을 분석해서 게임에서의 정치적 올바름 요소에 대한 개선안을 제시하고자 한다.

• Proceedings of the Korea Contents Association Conference
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• 2016.05a
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• pp.195-196
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• 2016

본 연구는 건설된 구조물의 주요 구조부재에 각종 계측 Sensor를 설치하여 이로부터 다양한 정보를 제공받아 Monitoring하는 계측 System은 대형구조물의 구조적 응답을 계측하여 분석하고, 구조물의 위험요소를 사전에 발견하고 분석하여 적절한 대책을 수립함으로써 대형 시설물의 수명연장 및 유지관리 비용의 효율성을 높이고, 구조물의 사용성 및 안전성을 확보하고, 그 설계수명을 유지할 수 있는 것이다. 계측전 초기치와의 비교 및 시간 경과에 따른 추이 분석을 통해 이상상태를 발견하는 신호 기반 감시 수행하고 있고, 상태판정 및 손상도 추정이 가능하므로 향후 계속해서 발전시켜 나갈 수 있는 지식기반 감시시스템이 필요하므로 본 연구에서는 공간 정보기반의 정보를 재생하여 GNSS/USN기술을 접목시켜감으로 대형시설물 안전관리가 매우 용이하게 적용할 수 있도록 하였다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.11a
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• pp.81-82
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• 2013

현재 도시의 발달은 건축물의 대형화와 다양화를 생활 필수 요소로 정착시켰으며 이는 공항, 역사, 체육시설, 전시시설을 비롯하여 여러 시설을 대형화 시켰다. 또한 급속도로 발전해온 국내 건축물의 대형화에 있어서 사고 및 피해는 건물이 고층화되면서 발생한 1971년 대현각호텔 화재사고와 같이 상시 발생가능성이 있는 대형화재의 위험성을 가지고 있다. 본 연구는 국내외 대공간 건축물의 화재 사례를 data base화하여 화재발생 확률 및 빈도를 분석하였다. 이러한 분석 결과는 화재발생가능성이 있는 대공간 건축물의 화재 시나리오 작성 및 대처방안 정립에 기초자료로 사용될 것으로 평가된다.