• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.10a
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• pp.422-427
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• 2004

The tool geometry parameters and cutting process have complex relationships. Until now, various cutting test were needed to acquire optimal design of end mill for the purpose of high speed machining, due to the insufficient knowledge about cutting process in high speed machining. Using various tools with different geometry, relationships between tool geometry parameter (rake angle, clearance angle, length of cutter) and cutting process (cutting force, surface accuracy, surface roughness) have been studied. Acquired data can be used to design optimal tool for high speed machining and to develop a software for design of end mill geometry.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1409-1410
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• 2008

Layer manufacturing technology has been recently spotlighted as a promising candidate to fabricate porous scaffolds for tissue engineering, because it can provide three dimensional interconnectivity and different pore structures and on-demand scaffold design. This study aims to fabricate HA/PCL composite scaffolds for bone tissue engineering by a layer manufacturing technology, paste extruding deposition, and to characterize in vitro and in vivo biocompatibilities of the scaffolds. This study discusses the mechnical properties, proliferation and differentiation of osteogenic cells, and tissue in-growth and bone regeneration behavior using animal models.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1255-1258
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• 2008

Roll to roll (R2R) system, known as 'web processing', is the process of producing these electronic devices on a roll of flexible plastic. With the need of improved performance and productivity in R2R industry, effective control and on-line supervision for web quality is essential. In this report, we present a system for on-line measurement of wrinkles, one of defects incurring due to compressive stresses developed in the web. This system is able to capture an image generated when a well defined line shape laser beam passes through a transparent web. The system calculates 3D shape information, including the height of the wrinkle on the web, and displays the images for the shape information of the web in real time. By using area scan camera and machine vision laser, this system takes more advantages of setting up as a simple and low cost system compared to the line scan camera systems that widely used in web manufacturing. Specific calibration method and analysis on the achievable accuracy will be discussed.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1997.05a
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• pp.71-73
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• 1997

미스티블루는 안개초와 함께 배경화로서 널리 이용되는 꽃으로 사계성이지만 한 여름철에는 추대본수가 감소하고 봄, 가을에 분지가 활발히 이루어진다. 한 번 정식한 묘를 보통 3년간 재배 하고 있는데 시장의 꽃가격에 맞춰 개화기를 다양하게 조절하고 있다. 보통 비가림하우스 재배시 6월 ∼ 10월 사이에 개화하는데 여름철 고온에 의해 품질이 저하되고 있다. 본 실혐은 시설내에서 미스티블루 재배시 잡초의 발생을 억제하오 절화의 품질을 향상시키고자 몇가지 토양피복제를 처리하여 그 효과를 구명하고자 실시하였다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2004.11a
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• pp.72-75
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• 2004

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2004.11a
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• pp.62-66
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• 2004

• Proceedings of the KSME Conference
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• 2001.06a
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• pp.322-327
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• 2001

The internal leaks of RCS pressure boundary valves may cause thermal fatigue crack because of the TASCS in RCS branch line. After experienced unisolable piping failures in several PWR plants, many studies have peformed to understand these phenomena and various methods were applied to ensure the structural integrity of piping. In this paper, the cause of unisolable piping failures and the alternatives to prevent recurrence of failure were reviewed. Also, the severity of piping failure including susceptibility of valve leaks was evaluated for the Westinghouse 2-loop plant. The length of turbulent penetration on RHR inlet piping was measured and, thermal fluid analysis and fatigue analysis was performed for this piping. As a means of ensuring the structural integrity, temperature monitoring and specialized UT and other alternatives were compared for the further application.

• Proceedings of the KSME Conference
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• 2001.06a
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• pp.716-721
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• 2001

The present study describes the experimental method to measure the strain of tire. In this study. the strain distributions of tire with air pressure and vertical load were measured at the bead filler edge region and on the carcass cord using strain gauges and the results were compared with indoor bead durability test results. The strain amplitude of carcass cord near the rim check line of tire is one of the main factors that affects bead durability characteristic.

• Proceedings of the KSME Conference
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• 2001.06a
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• pp.280-285
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• 2001

As an integral part of the probabilistic fracture mechanics analysis, stress intensity factor calculation scheme for semi-elliptical surface flaws in thin-walled cylinder has been introduced. The approximation solution utilizes the influence coefficients to calculate the stress intensity factor at the crack tip. This method has been compared with other solution methods including 3-D finite element analysis for cooldown boundary condition. The analysis results confirmed that the simplified methods provided sufficiently accurate stress intensity factor values for axial semi-elliptcal flaws on the surface of the reactor pressure vessel.

• 한국IT서비스학회:학술대회논문집
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• 2002.06a
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• pp.381-386
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• 2002

급변하는 정보화 사회에서, 철도 물류 정보 분야는 업무 자동화에 대한 인식 부족, 데이터 실시간 처리 불가, 열악한 사용자 환경 등으로 인해 활성화되지 못하였다. 이러한 상황을 극복하기 위해 인터넷을 기반으로 하며 차세대 인터넷 표준으로 알려진 XML을 적용한 철도 물류 정보 연계 시스템을 구축하였다. 구축된 시스템은 기존의 철도 물류 정보 시스템의 기능과 성능을 개선하여 사용자에게 안정되고 편리한 서비스를 제공하기 위한 구조로 설계되었다. 또한 기존의 2-tier 형태의 WEB 구조를 3-tier 형태로 하여 보안이 강화된 구조로 하였으며, 새로운 인터넷 표준으로 각광받는 XML Schema와 XSL을 적용하여 앞서 나가는 철도 물류 정보 시스템이 되도록 하였다.