• Proceedings of the KSME Conference
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• 2001.06c
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• pp.170-175
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• 2001

The design cycle associated with large engineering systems requires an initial decomposition of the complex system into design processes which are coupled through the transference of output data. Some of these design processes may be grouped into iterative subcycles. In analyzing or optimizing such a coupled system, it is essential to determine the best order of the processes within these subcycles to reduce design cycle time and cost. This is accomplished by decomposing large multidisciplinary problems into several multidisciplinary analysis subsystems (MDASS) and processing it in parallel. This paper proposes new strategy for parallel decomposition of multidisciplinary problems to improve design efficiency by using the multiple objective genetic algorithm (MOGA), and a sample test case is presented to show the effects of optimizing the sequence with MOGA.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.10a
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• pp.321-326
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• 2004

인간의 뇌와 같이 다양한 정보들을 구분하고 처리하며 기억할 수 있는 능력을 지닌 시스템은 현재 지능 기법이 적용되고 있는 제어, 통신, 인터넷 응용 기술, 경영 분야, 분석 및 예측 등의 분야에 응용될 수 있으며 그 성능을 효과적으로 향상시킬 것이다. 이러한 다양한 분야에 활용될 수 있는 통합 모델을 제시하고 점차 발전시켜나감으로써 미래에 기대되는 다양한 인간형 시스템, 친환경적 시스템, 인간보조 시스템 등의 공학적 시스템 측면과 인간을 대신할 수 있으면서 인간과 유사한 능력을 지닌 학습 시스템, 추론 시스템, 판단 시스템 등의 지능형 시스템 측면에서 활용 가능한 모델로 성장시켜 나갈 수 있다. 이에, 본 논문에서는 생물학적인 두뇌의 정보처리 메커니즘을 해석하고 공학적인 개념의 정립과 정보처리 흐름을 규명하고 정의함으로써 출력에 반영할 수 있는 모듈을 설계하고 최종적으로, 뇌 정보처리 메커니즘에 기반한 레이어를 설계하여 범용으로 사용될 수 있도록 하고자 한다. 본 논문에서 설명되는 레이어 구조는 공학적인 분야는 물론 생물학적 뇌 연구에도 활용될 수 있을 것으로 기대된다.

• Proceedings of the Korean Reliability Society Conference
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• 2002.06a
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• pp.111-111
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• 2002

당사 제품인 건설 중장비용 대형 용접 구조물에 대하여, 설계단계부터 구조해석 및 초도품에 대한 Rig Test, 실차 시험 등 여러 단계를 거쳐 내구성을 평가하고 있다. 그러나 용접품 특성상 수명 평가 및 예측이 용이하지 않아 특히 내구성 개선 또는 효율 증대를 위한 경량화 등의 필요에 따른 설계 변경시 시행착오를 거치는 경우가 많다. 이에 개발 일정의 지연, 시험 비용의 증대 등이 불가피하고, 보증 수명의 증대를 통한시장 확대 등에 있어서도 애로가 있다. 또한 기존 Rig Test의 경우도 실제 사용환경과의 차이 등으로 인해 필드에서의 사용 수명을 예측하는데 한계가 있다. 이에 당 센터에서는 통계적 분석을 통한 사용 조건의 DB 구축과 제품 품질 DB의 구축 및 통합을 통하여 제관품의 특성을 반영한 용접 구조물의 가속 수명 평가법의 신뢰도 향상과 시장 목표에 부합하는 최적 설계 달성을 위한 독자적 Tool을 개발하고 있으며, 이에 대한 첫 번째 과제로 기확보 데이터에 대한 상관관계를 분석하였다.

• 유체기계공업학회:학술대회논문집
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• 2005.12a
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• pp.491-496
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• 2005

A pump design system was constructed by several integrating in-house programs and commercial softwares to design and evaluate centrifugal pumps. An agent-based prototype framework has been developed for collaborative design and optimization of a centrifugal pump. This paper introduces the feasible technology needed to construct a pump design system based on software agents. The integrated design system, developed in the present study, was used in designing a centrifugal pump and modifying its impeller shape by using optimization processes to increase the pump performance.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.8
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• pp.649-656
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• 2013

High-lift devices have a major influence on takeoff, landing and stall performance of an aircraft. Therefore, a slotted flap design optimization process is proposed in this paper to obtain the most effective flap configuration from supported 2D flap configuration. Flap deflection, Gap and Overlap are considered as main contributors to flap lift increment. ANSYS Fluent 13.0.0$^{(R)}$ is used as aerodynamic analysis software that provides accurate solution at given flight conditions. Optimum configuration is obtained by Sequential Quadratic Programing (SQP) algorithm. Performance of the aircraft with optimized flap is estimated using Aircraft Design Synthesis Program (ADSP), the in-house performance analysis code. Obtained parameters such as takeoff, landing distance and stall speed met KAS-VLA airworthiness requirements.

• 한국전산유체공학회:학술대회논문집
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• 2010.05a
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• pp.78-82
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• 2010

An integrated multi-disciplinary design system plays a critical role in the preliminary design of an aircraft. In this paper such system is developed for the multi-disciplinary computation and design; aerodynamics elasticity, and radio frequency stealth. Common data base of geometry and structured grids is generated and used for aerodynamic, structural and eletromagnetics analysis. The Navier-Stokes CFD, FEM, and CEM technique are used for aerodynamic, structural, and RF stealth computations respectively.

• Annual Conference on Human and Language Technology
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• 1990.11a
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• pp.97-103
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• 1990

읽기시간과 재인기억을 통하여 스크립트에 부합되지 않는 정보가 어떻게 처리되는지 알아보았다. 실험 1에서는 문장을 읽고 문장 재인검사틀 하였다. 스크립트 비부합 문장의 읽기시간은 길고 재인 반응시간은 빨랐다. 실험 2, 3은 스크립트에 부합하지 않는 정보가 기억이 잘되는데, 그 이유가 노력의 결과로 다른 정보와 통합되었기 때문인지 아니면 비부합정보가 두드러졌기 때문인지 알아보려고 설계되었다. 실험 2에서는 명제쌍을 만들어 즉시 재인기억을 하였고, 실험 3에서는 피험자가 비부합정보를 충분하게 처리할 수 있도록 자기 속도(self-paced)로 읽고 명제쌍으로 지연재인검사를 했다. 비스크립트 정보와 전형적인 명제로 된 명제쌍이 전형적인 명제쌍보다 반응시간이 길었다. 이 결과는 스크립트 비부합정보는 자체로는 기억이 잘되나 다른 정보와 통합은 되지 않은 것으로 해석되었다.

• Journal of Science Education
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• v.37 no.3
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• pp.525-537
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• 2013

The purpose of this study was to investigate science integrated process skill of the students in science education center for the gifted. In order to do this, 'free-response test for the assessment of science process skills' developed by Yu-Hyang Kim(2013) was administered to 102 students(15 in elementary school science class, 58 in middle school science class I, and 29 in middle school science class II) who attend the program of science education center for the gifted in C university. The assessment tool measured 9 skills ; formulating inquiry questions, recognizing variables, formulating hypotheses, designing experiment, transforming data, interpreting data, drawing conclusions, formulating generalizations, and evaluating the designed experiments. As a result, the students in science education center for the gifted had relatively high scores in the area of 'formulating hypotheses' and 'recognizing variables', but they had relatively low scores in the area of 'transforming data', 'interpreting data', and 'evaluating the designed experiments'. The 2 items' percentage of correct answers were below 40% ; one is about a drawing a line graph in 'transforming data', and the other requires finding improvements of the experimental design in 'evaluation'. There was no significant difference between boys' scores and girls's one, and between the scores of students in the field of biology and those of students in the other fields(physics, chemistry, and earth science) in science integrated process skills. And there was significant difference according to the periods receiving the gifted education in 'formulating generalizations'. The teaching and learning has to focus on improving science integrated process skills in the program of science education center for the gifted and teaching and learning materials needs to be developed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.958-961
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• 2005

This paper introduces the development of an integrated design system using Service-Oriented Architecture. The system is proposed and being developed based on several advanced technologies, such as multi-agents, Internet/web Service, workflow, database and is aiming to provide the successful fulfill our target of integrating personnel, design activities and engineering resources along a predefined engineering design project (workflow) during product development process. By using SOA concept, the system tries to separates the engineering process into the engineering knowledge and the usage of engineering tool. Consequently, the computing resources in organization can be fully utilized and thus the cost can be reduced. The system is being designed and developed on the base of JADE (Java Agent DEvelopment Framework).

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.2
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• pp.109-117
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• 2004

Optimization has been successfully applied to systems with a single discipline. As many disciplines are involved in coupled fashion, MDO (multidisciplinary design optimization) technology has been developed. MDO algorithms are trying to solve the coupled aspects generated from interdisciplinary relationship. In a general MDO algorithms, a large design problem is decomposed into small ones which can be easily solved. Although various methods have been proposed for MDO, the research is still in the early stage. This research proposes a new MDO method which is named as MDOIS (Multidisciplinary Design Optimization Based on Independent Subspaces). Many real engineering problems consist of physically separate components and they can be independently designed. The inter-relationship occurs through coupled physics. MDOIS is developed for such problems. In MDOIS, a large system is decomposed into small subsystems. The coupled aspects are solved via system analysis which solves the coupled physics. The algorithm is mathematically validated by showing that the solution satisfies the Karush-Kuhn-Tucker condition.