• Proceedings of the KSME Conference
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• 2004.11a
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• pp.904-909
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• 2004

In this paper a web-based micro fabrication system is discussed. A commercial CAD and a web browser were used as its user interfaces. In these user interfaces the concepts of Design for Manufacturing (DFM) was implemented providing the fabrication knowledge of micro machining to the designers. Simple databases were constructed to store the fabrication knowledge of materials, tools, and micro machining know-how. The part geometry was uploaded to the web server of this system as an STL (Stereo Lithography) format with process parameters for 3-axis micro milling. A Slice-based process planner automatically provides NC codes for controlling micro stages. A couple of micro parts were fabricated using the system with micro endmills. This design and manufacturing system enables network users to obtain micro-scale prototypes in a rapid manner.

• Korean Journal of Computational Design and Engineering
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• v.13 no.1
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• pp.27-35
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• 2008

Digital Virtual Manufacturing is a technology facilitating effective product developments and agile productions via digital models representing the physical and logical schema and the behavior of real manufacturing systems. A digital virtual factory as a well-designed and integrated environment is essential for successful applications of this technology. In this research, we construct a sophisticated digital virtual factory for the section steel shop in a Korean shipbuilding company by 3-D CAD and virtual manufacturing simulation. The NIST-AMRF CIM hierarchical model and workflow analysis using IDEF methodology are also applied. This digital virtual factory can be applied for diverse engineering activities in design, manufacturing and control of the real factory, and improvements in quality of engineering and savings in time from design to production in shipbuilding are possible.

• International Journal of Precision Engineering and Manufacturing
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• v.7 no.3
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• pp.39-46
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• 2006

This paper presents an elastic deformation model of a spindle unit (S/U), which takes into account the non-linear properties of high-speed ball bearings (particularly the effect of high rotational speed). For this, a software for the estimation of the S/U elastic deformation properties was developed and intended for use by S/U designers. A computer aided analysis of the model using the developed software was carried out and experiments showed the significant effect of rotational speed, cutting load and bearing axial preload, and showed some new phenomena, from which the criteria for the choice of bearing axial preload is given.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.35-35
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• 2004

본 세미나에서는 Design for Manufacturing(DFM)의 개념과 인터넷기술을 접목한 '인터넷기반의 설계 및 생산'이라는 개념의 이해를 도모하고자 한다. 전통적인 Over-the-wall manufacturing의 단점인 설계와 제조의 불연속성을 인터넷을 사용하여 개선하는 것이 본 연구의 주 목표이다. 친근한 웹브라우저를 사용자 인터페이스로 사용하여 제조공정에서 얻어진 지식을 설계자에게 디자인 규칙(Design Rule)으로 제시한다. 이를 위해 3 단계 클라이언트-서버를 사용한 통신체계를 구축하고 공정계획에 관여된 프로그램을 개발하였다.(중략)

• Journal of the Korea Institute of Military Science and Technology
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• v.2 no.2
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• pp.13-23
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• 1999

This paper deals with manufacturing process design of a simplified gun tube applying CE principle. A concept and characteristics of CE, mathematical model for understanding interaction between design and manufacturing, basic elements and related equations for process planning and cost estimating are introduced. A Knowledge-based Computer-Aided Process Planning System(KCAPPS) is constructed, yielding optimal production cost/time for the shape input and selection of appropriate machines and tools.

• Design & Manufacturing
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• v.8 no.1
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• pp.19-22
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• 2014

Today, looking at the trend of product development, interests of injection technology to reduce weldline are growing because of increases of polymer composite materials that containing functional elements and demand of no-painted injection in accordance with environmental regulations. In this paper, surface temperatures of mold increased using high temperature gas for elimination of weldline and characteristics of weldline are analyzed according to mold temperature($60^{\circ}C{\sim}120^{\circ}C$).

• Journal of the Korean Society for Precision Engineering
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• v.23 no.3 s.180
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• pp.32-38
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• 2006

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.259-262
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• 2003

Group technology(GT) is a manufacturing philosophy which identifies and exploits the similarity of parts and processes in design and manufacturing. A specific application of GT is cellular manufacturing. the first step in the preliminary stage of cellular manufacturing system design is cell formation, generally known as a machine-part cell formation(MPCF). This paper presents and tests a grouping gentic algorithm(GGA) for solving the MPCF problem and uses the measurements of e(ficacy. GGA's replacement heuristic used similarity coefficients is presented.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2004.05a
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• pp.163-166
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• 2004

This paper proposes decomposition-based approach for developing the evaluation factors of performance measures and designing performance measures in manufacturing system. In this paper, the evaluation factors are designed by design decomposition approach and the design process of performance measures is based on the manufacturing system design decomposition.

• Journal of Aerospace System Engineering
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• v.2 no.4
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• pp.38-43
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• 2008

Since UAV has been developed, the demand of uav is increasing because of the advantage which are no injury people and less cost. Also, it has easy maintenance and adaptation because it will carry out each mission by only change payload. So, in this study, we performed aircraft design and manufacturing which it could have maximum payload weight when consider each mission has different weight of payload