• Journal of the Korean Society for Precision Engineering
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• v.14 no.7
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• pp.39-48
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• 1997

This paper describes the process planning system of a computer-aided design of blanking and piercing for irregularly shaped sheet metal products. An approach to the system is based on knowledge-based rules. The process planning system is designed by considering several factors, such as the complexity of blank geometry, production feasibility of products, and punch profile complexity. Therefore this system which was implemented production feasibility check and strip layout module can carry out a process planning considering a production feasibility area of both internal and external features, a dimension of blanked hole, a coner and a fillet radius for irregualrly shaped sheet metal products and generate the strip layout in graphic froms. Knowledges for process planning are extracted from plasticity theories, handbooks, relevant references and empirical know- hows of experts in blanking companies. This provides powerful capabilities for process planning system of irregularly shaped sheet metal products.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.10a
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• pp.642-647
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• 1994

This paper describes some research works of computer-aided design of blanking & piercing progressive die for stator and rotor parts by the press. An approach to the system is based on knowledge based rules. The developed system is composed of five main modules such as input & graphic interface, blanking feasibility check, strip layout, die layout and output module. Using this system, design parameters (geometric shapes, die generated in dimensions and dimensions of tool elements) are determined and output is generated in graphic form. Knowledges for tool design are extracted from the plasticity theories, handbooks, relevent references and empirical know-hows of experts in blanking companies. The developed system provides powerful capabilities for process planning and die design of stator and rotor parts.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.8
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• pp.40-51
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• 1996

This paper describes some research works of computer-aided design of blanking and piercing progressive die for stator and rotor parts. An approach to the system is based on knowledge based rules. The deveolped system is composed of six modules such as main program, input and shape treatment, production feasibility check, strip layout, die layout and drawing edit module. Using this system, design parameters ( geometric shapes, die and punch dimensions and dimensions of tool elements) are determined and output is gen- erated in graphic from. Knowledges for tool design are extracted from the plasticity theories, handbooks, relevant references and empirical know-hows of experts in blkanking companies. The developed system provides powerful capabilities for process planning and die design of stator and rotor parts.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2001.10a
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• pp.287-291
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• 2001

In this study, we designed and constructed a multi-forming progressive die with a bending, embossing on the multi-stage and performed through the try out. Out of the characteristics of this paper that nothing might be ever seen before such as this type of research method on the all of processes of thin and high precision production part.

• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.245-248
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• 2007

본 논문에서는 LCD S/C (Shield Case)의 스트립 레이아웃 도를 작성하였다. 프레스 금형에 있어서 스트립 레이아웃 도는 제품 양산을 결정하는 중요 요인이다. 장착되는 다른 부품과의 간섭요인을 용이하게 수정하기 위하여 3D CAD/CAM 시스템을 적용하였다. 사용된 3D CAD/CAM 소프트웨어는 Unigraphics NX 3.0이며 12개 공정으로 스트립 레이아웃 도를 작성하였다.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.252-254
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• 2009

프로그레시브 노칭과 포밍금형에 있어서 박판성형해석에 의한 사전 분석은 제품을 양산하는데 꼭 거쳐야 하는 필수과정이다. 본 논문에서 연구한 Ez5는 일본 S 자동차의 미국 현지 공장에서 발주한 수출 금형을 가지고 스트립 레이아웃 설계에 관한 것을 연구한 것이다. 광폭 1열 1개 뽑기의 편측캐리어를 단 배열로 블랭크 레이아웃을 최적화하였다. 사용된 3D CAD/CAM 소프트웨어는 Cimatron E Die Design이며 10개 공정으로 스트립 레이아웃설계를 완성하였다.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1166-1168
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• 2010

본 논문에서는 HEV UV단자를 자동화 모듈인 씨마트론 다이 디자인을 활용하여 스트립 레이아웃설계를 3D로 하였다. 제품의 스탬핑을 원활하게 하기 위하여 스트립 레이아웃을 33.5도 경사지게 수정하여 광폭 1열 1개 뽑기의 내측캐리어를 단 배열로 블랭크 레이아웃을 최적화하였다. 1개의 금형에서 두개의 단자를 공용으로 양산하기 29개 공정으로 3D 스트립 레이아웃설계를 완성하였다.

• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.35-39
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• 2008

프로그레시브금형에 있어서 스트립 레이아웃설계는 제품 양산을 결정하는 중요 요인이다. 본 논문에서는 자동차에 사용되는 브라켓의 스트립 레이아웃설계를 하였다. 3D모델링이 아닌 자동화 모듈인 씨마트론 다이 디자인을 활용하여 3D로 스트립 레이아웃설계를 하였다. 광폭 2열 2개 뽑기의 내측캐리어를 단 배열로 블랭크 레이아웃을 최적화하였다. 사용된 3D CAD/CAM 소프트웨어는 Cimatron Die Design이며 10개 공정으로 스트립 레이아웃설계를 완성하였다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.22 no.6
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• pp.30-36
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• 2018

Researches on strengthening and rehabilitation are important since structural capacity is degraded by deterioration or damage of structural members. An effective strengthening scheme such as an externally bonded Carbon Fiber Reinforced Polymers (CFRP) can improve the structural performance of a concrete structure in a cost-effective way. Therefore, many experimental studies on strengthening methods have been widely carried out. In regards to the shear strengthening of a concrete beam, variables of the experimental studies were the amount of CFRP, the angle of the strip, the width of the strip, and the interaction between the materials. However, there are insufficient researches on bi-directional CFRP layout compared to the previous researches. In this study, a total of ten concrete beams were designed and tested to evaluate the shear strengthening effect using CFRP strips. The effectiveness of strengthening was investigated based on the shear contribution of materials, strain distribution of stirrup, and the maximum shear capacity of specimens.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.3
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• pp.278-285
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• 2013

In this paper, a 100~110 GHz LNA and A coupler using standard 65 n CMOS process is presented. The LNA consists of three common source FET stages. A few layout types are considered to get high gain characteristic of unit common source cell. Also, optimized performance to achieve low noise characteristic and enough gain. Coupler is composed of broadside coupler using multimetal in CMOS fabrication. In the coupler, the metal strip to meet density rule is used, and the coupler is designed with consideration of the metal strip to function properly. Gain of fabricated LNA is 5.64 dB at 100 GHz and 6.39 dB at 110 GHz. Bandwidth is over 10 % and noise figure is 11.66 dB at 100 GHz. Fabricated coupler has shown insertion loss of 2~3 dB at 100~110 GHz band. Magnitude mismatch of coupler is below 1 dB and phase mismatch of coupler is below $5^{\circ}$.