• Proceedings of the Optical Society of Korea Conference
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• 2008.02a
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• pp.69-70
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• 2008

본 논문은 광학 탑재체 성능의 MTF 예측에 있어, 광학 해석 프로그램인 ZEMAX와 MATLAB으로 구현된 기본 광학계 성능 해석 모델을 하나의 통합적인 툴 체계로 구현하였다. 그 결과 광학 탑재체 성능 해석에 광학계 설계, 제작/조립 및 궤도 상에서의 오차를 직접 반영할 수 있게 되었고 광학 탑재체의 초기 설계 단계에서 주요 설계인자를 도출하고, 지배적인 영향을 미치는 입력변수와 설계 요소들을 활용하여 광학 탑재체의 성능 예측을 수행할 수 있는 효율적이고 체계적인 틀을 개발하였다.

• CDE review
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• v.10 no.1
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• pp.39-47
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• 2004

설계분야의 중요성은 신차 개발에 소요되는 부문별 비용들과 그들이 성능 및 생산성에 미치는 영향을 보여주는 그림 1을 통하여 명확히 설명될 수 있다. 이는 설계부문에 소요되는 비용이 다른 부문에 비해 적지만 성능 및 생산성에 미치는 영향은 지대함을 보여주며, 국내 산업체도 그 중요성을 인식하고 연구개발 투자의 비중을 높여가고 있다. 그런데, 국내 산업체의 현황을 살펴보면, 설계는 부품별 혹은 해석 분야별로 나뉘어 여러 설계부서들에서 이루어지며, 결과를 종합하는 단계에서 서로 상충되는 결과가 나타나면 관리자의 판단이나 부서간 협의에 의하여 재 설계하는 과정을 반복한다. (중략)

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.37-38
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• 2011

본 논문에서는 RT(Real Time)기반의 IPMSM(Interior Permanent Magnet Synchronous Motor) 설계 및 해석, 평가 플랫폼을 개발하고자한다. GUI(Graphical User Interface)로 제작 된 플랫폼 실행창에서 설계변수의 수치적 입력을 통해 설계 자동화를 구현하며, 수치해석프로그램 FEMM과 연동함으로써 전동의 전자계 해석 및 제어정수의 추출을 수행한다. 아울러 추출된 제어정수를 이용, Simulink의 실시간 시뮬레이션을 통해 IPMSM의 제어를 수행하여 통합적 설계 해석 평가를 도출한다.

• Composites Research
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• v.12 no.6
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• pp.43-52
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• 1999

This paper explains the development of a concurrent engineering system for the rlesign of composite structures. The concurrent engineering system is developed to meet the demand for the better quality products with lower production cost and time. In this study, to compose the architecture of concurrent engineering system, the commercial and noncommercial programs related to design and analysis of composite structures are surveyed and classified. The concurrent engineering system is including various design modules such as design/analysis of composite structures using CLPT and FEM, buckling and post bucking analysis, thermo-elastic analysis of carbon-carbon composite, and optimum design using expert system and genetic algorithm. For the integration and management of softwares, the concurrent engineering system is realized by Microsoft visual $C++{^\circledR}$ that provide multi-tasking and graphic user interface environment.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.5
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• pp.18-24
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• 2003

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 sybcycles. Previous researches predifined the numbers of design processes in groups, but these group sizes should be determined optimally to balance the computing time of each groups. This paper proposes adaptive decomposition method, which determines the group sizes and the order of processes simultaneously to raise design efficiency by expanding the chromosome of the genetic algorithm. Finally, two sample cases are presented to show the effects of optimizing the sequence of processes with the adaptive decomposition method.

• Journal of Internet Computing and Services
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• v.7 no.5
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• pp.123-134
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• 2006

In this research paper, We have proposed an interpretation structure concerned with context-awareness which is essential to provide intelligent service. The proposed model has an interpretation structure that integrated information of both external and internal context, and been designed to keep independency between context information and application service. To verify the interpretation structure that proposed, we established a test bed (Ubi-Class) in which the concept of context awareness has been introduced to the existing class room, and constituted a scenario, and tested whether intelligent service is performed according to context interpretation.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• v.y2005m4
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• pp.11-15
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• 2005

Compared with the conventional ground rocket launching, air-launching has many advantages. However, comprehensive and integrated system design approach is required because the physical geometry of air launch vehicle is quite dependent on the installation limitation of the mother plane. The system design has been performed using two different approaches: the sequential optimization and the multidisciplinary feasible(MDF) optimization method. Analysis modules include mission analysis, staging, propulsion analysis, configuration, weight analysis, aerodynamics analysis and trajectory analysis. MDF optimization shows better result than sequential optimization. As a result of system optimization, a supersonic air launching rocket with total mass of 1244.91 kg, total length of 6.18 m, outer diameter of 0.60 m and the payload mass of 7.5 kg has been successfully designed.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.12
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• pp.26-32
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• 2005

Compared with the conventional ground rocket launching, air-launching has many advantages. However, a comprehensive and integrated system design approach is required because the physical geometry of air launch vehicle is quite dependent on the installation limitation of the mother plane. The system design has been performed using two different approaches: the sequential optimization and the multidisciplinary feasible(MDF) optimization method. Analysis modules include mission analysis, staging, propulsion analysis, configuration, weight analysis, aerodynamics analysis and trajectory analysis. MDF optimization shows better results than the sequential optimization. As a result of system optimization, a supersonic air launching rocket with total mass of 1244.91kg, total length of 6.36m, outer diameter of 0.60m and the payload mass of 7.5kg has been successfully designed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.2 no.2
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• pp.115-119
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• 2001

The design and manufacture of injection molded polymeric parts with desired properties is a costly process dominated by empiricism, including the repeated modification of actual tooling. This paper presents an knowledge-based synthesis system which can predict the mechanical performance of a molded product and diagnose the design before the actual mold is machined. The knowledge-based system synergistically combines a rule-based system with CAE programs. Hueristic know]edge of injection molding. flow simulation, and mechanical performance prediction is formalized as rules of an expert consultation system. The expert system interprets the analytical results of the process simulation, predicts the performance, evaluates the design and generates recommendation for optimal design alternatives.

• Journal of Drive and Control
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• v.2 no.1
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• pp.10-17
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• 2005