• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.407-408
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• 2009

Drying shrinkage have influence on the durability of concrete structure. Various models have been suggested to predict the drying shrinkage, experimentally. In this study, the drying shrinkage with Concrete strength and Curing condition was measured, and compared with representative model code. As a result, drying shrinkage was reduced as W/C ratio decrease, and total shrinkage greatly reduced in 4 week wet curing case. The test results agreed with EC2 model better than the other.

• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.21.1-21
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• 2003

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2002.05a
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• pp.180-180
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• 2002

• ETRI Journal
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• v.24 no.5
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• pp.333-340
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• 2002

We propose a new process technique for fabricating very high-density trench MOSFETs using 3 mask layers with oxide spacers and a self-aligned technique. This technique reduces the device size in trench width, source, and p-body region with a resulting increase in cell density and current driving capability as well as cost-effective production capability. We were able to obtain a higher breakdown voltage with uniform oxide grown along the trench surface. The channel density of the trench DMOSFET with a cell pitch of 2.3-2.4 ${\mu}m$ was 100 Mcell/$in^2$ and a specific on-resistance of 0.41 $m{\Omega}{\cdot}cm^2$ was obtained under a blocking voltage of 43 V.

• Proceedings of the KSME Conference
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• 2001.11b
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• pp.102-105
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• 2001

Numerical simulations of coal combustion were carried out to identify what kind of burner design parameters are affecting the NOx emission. Where used burner design parameters are primary air velocity, secondary air velocity, $2^{nd}/3^{rd}$ air ratio, tertiary air velocity, and tertiary air injection location. Taguchi method was used to find the effective burner design parameters related to NOx formation. The results of numerical simulations showed that secondary air velocity and $2^{nd}/3^{rd}$ air ratio was the key parameters reducing the NOx emission. The total number of simulation cases was reduced by Taguchi method.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.543-550
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• 2007

This study is for an effective response as the pre-stage for railway agencies to prepare the rail road kind based emergency response standard operation procedures when the emergency event occurs. Accordingly, I would like to increase the utility in helping the railroad employees to make their decisions. And that is possible through suggesting them to make computerized Emergency situation based activity and Emergency response that is individual based. And of course all of this procedure would be based on the emergency event categorized response scenario.

• Proceedings of the Optical Society of Korea Conference
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• 2009.10a
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• pp.300-301
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• 2009

In order to design a special illuminator required for an automated optical inspection system, distributions of illuminating angles and intensities of illuminating rays incident on a specimen surface are taken into consideration. This methodology is tried to optimize coaxial illuminating systems by using the specially-coded program.

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2002.04a
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• pp.58-58
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• 2002

• Proceedings of the Korean Vacuum Society Conference
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• 2006.02a
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• pp.148-148
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• 2006

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2003.11a
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• pp.352-356
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• 2003

본 논문에서는 매우 넓은 저지대역과 우수한 cutoff 특성을 갖는 저역통과 여파기를 제안하였다. 접지면 슬롯과 급전면 개방 스터브의 특성을 결합한 기존의 광대역 여파기에서 전송선의 길이를 ${\lambda}_g/4$로 변형함으로써 기존의 여파기보다 더 작은 크기로 넓은 저지대역과 급격한 cutoff 특성을 얻을 수 있었다. 또한 설계한 단위 여파기를 특정 간격로 배열하여 더 깊은 저지대역과 향상된 cutoff 특성을 얻을 수 있었다.