• Fire Protection Technology
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• s.44
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• pp.25-29
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• 2008

• Electric Engineers Magazine
• /
• s.309
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• pp.29-30
• /
• 2008

• Bulletin of the Society of Naval Architects of Korea
• /
• v.28 no.1
• /
• pp.51-53
• /
• 1991

• Electric Engineers Magazine
• /
• s.308
• /
• pp.29-33
• /
• 2008

• Bulletin of the Society of Naval Architects of Korea
• /
• v.51 no.3
• /
• pp.8-12
• /
• 2014

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2005.05a
• /
• pp.171-171
• /
• 2005

• Journal of the Society of Naval Architects of Korea
• /
• v.40 no.4
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• pp.53-58
• /
• 2003

Design of the corrugated watertight bulkhead for a bulk carrier is principally determined by the permissible limit of Classification requirements. As the weight of upper and lower stool has considerable portion of the total weight of the transverse bulkhead, optimum design including the stool geometry and size will play an important role on economic shipbuilding. The purpose of this study is focused on the minimization of steel weight using the design variables, which are the shape and the size of the corrugation as well as the upper and lower stools. Discrete variables are used as design variables for the practical design. In this study, the evolution strategies (ES), which can highly improve the possibility of leaching the global minimum point, are selected as an optimization method. Usefulness of this study is verified by comparison with the proven type ship design. As objective function, total weight of the transverse bulkhead including the upper and lower stools is used.

• Journal of computational fluids engineering
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• v.6 no.1
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• pp.56-62
• /
• 2001

A high speed train passing through a station may have undesired effects to passengers on platform due to abrupt pressure transients. Therefore it is very important to reduce the possible degree of danger by installing partition walls in passing lanes in designing the stations having passing train. In the present study, a pressure load to a passenger on platform is studied for the cases of various heights of the partition wall to assess the effectiveness of the wall on the passenger safety. From the results, it is seen that the pressure load on a passenger may be largely reduced by the partition wall. The heights of the partition wall for various passing speed are also studied based on the safety regulation.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2001.10a
• /
• pp.26-31
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• 2001

Recently, miniaturization and mass production are the main trends in manufacturing fields. Therefore, ultraprecision machining and MEMS technology have been taken more and more important position in machining of microparts. Micro endmilling is one of the prominent technology that has wide spectrum of application field ranging from macro parts to micro products, such as PDP and IT components, in precision products manufacturing. However, the deburring is significant problem in making smooth and precise parts in micro endmilling. This paper shows removal characteristics of burr generated by micro endmilling process. Additionally, it is necessary to understand the formation mechanism of burr of micro barrier ribs to find proper deburring method.

• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.58-61
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• 2007

본 논문에서는 액상분말 전자종이 특성 평가 하였다. 액상분말은 두 가지 타입의 마이너스 극성과 플러스 극성이 있으며 이때 전압을 인가하기 전에는 중성 상태이며, 전압을 인가하면 충전을 하며 충전 이 되면 서로 반대의 극성 쪽으로 이동한다. 액상분말 전자종이의 구조는 상하 유리 기판에 ITO/격벽을 형성이 되었고 그 사이에 액상분말이 틀어가 있는 구조이다. 유기기판에 ITO/격벽을 형성을 한 후 putting을 하고 합착을 한다. 상 하판 분리방식으로 노란색 액상분말 및 검은색 액상분말을 충전한 후 전압을 인가하여 소자의 구동을 하였으며 제작된 소자의 전기 및 광학특성 평가 하였다.