• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.11-16
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• 2009

Better understanding of in-situ mechanical behavior of pavement foundations is very important to predict long-term effects on the system performance of transport infrastructure. In order to do that, resilient stiffness characterization of geomaterals is needed to properly adopt such mechanistic analysis under both traffic and environmental loadings. In this paper, in situ monitoring data from KHC test road was used to analyze the non-linearity of stress conditions under traffic and moisture loadings. Then, the predicted non-linear response using finite element method with a selected constitutive model of foundation geomaterials are verified with the field data.

• Proceedings of the Korean Geotechical Society Conference
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• 2008.10a
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• pp.779-783
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• 2008

LRFD Resistance factors for static bearing capacity of driven steel pipe piles were calibrated in the freamework of reliability theory. Reliability analysis was performed by the First Order Reliability Method (FORM) using resistance bias factor statistics.The target reliability indices are selected as 2.0 and 2.33 for group pile case and 2.5 for single pile case, based on the reliability level of the current design practice and considering redundancy of pile group, acceptable risk level, construction quality control, and significance of individual structure.

• Proceedings of the Korean Geotechical Society Conference
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• 2002.03a
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• pp.337-342
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• 2002

A new apparatus called the EFA (Erosion Function Apparatus) has been built and tested to measure the erodibility of fine-grained soils. The EFA is a simple test to predict the erosion rate of fine-grained soils along with the corresponding velocity and shear stress. In addition, it is advantageous in predicting the scour rate for actual soil samples from bridge sites. The plot of erosion rate versus shear stress is the result of an EFA test. It Indicates the critical shear stress at which erosion starts and the rate of erosion beyond that shear stress. In order to measure the erodibilities of various soils, 14 Shelby Tube soil samples are collected from the actual bridge sites and tested using the EFA. The results of the EFA tests which are the relationships between erosion rates and shear stresses are presented in this paper and research continues to develop the correlation between the erosion function and the soil properties.

• 한국방재학회:학술대회논문집
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• 2008.02a
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• pp.59-62
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• 2008

Scour vulnerability evaluation for shallow foundations was performed to assure bridge safety against scour in the national capital region. The case studies for 26 shallow foundations consisted of site investigation including boring test, bridge scour analysis for the design flood, bearing capacity evaluation of the bridge foundation before and after scour, and comprehensive evaluation of bridge scour vulnerability. Bridge scour vulnerability was determined based on the interdisciplinary concept considering predicted scour depth for the design floods and bearing capacity of foundation as well as dimensions of foundation. Nine of 26 shallow foundations showed the potential future vulnerability to scour with significant decrease in the bearing capacity of foundations due to scour and the remaining 17 were expected to maintain their stability against scour.

• Journal of Industrial Convergence
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• v.13 no.4
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• pp.39-45
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• 2015

This thesis is to analyse the correlations between superior's behavior and subordi nate's personal character. In order to do this study first, I set up a hypothesis. Second, I surveyed the result from the questionnaire to verify it on the basis of the data on the 442 employees who work at Ban-Wol Complex in Ansan City Third, I used the SPSS program. Based on the result of the research, the hypothesis is proved as follows: The result from superior's autonomy shows high subordinate's Self-esteem and Self-regulation, but result from strong superior's regulation shows low Self-esteem and Self-regulation.

• Proceedings of the Optical Society of Korea Conference
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• 2007.07a
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• pp.97-98
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• 2007

• Proceedings of the Optical Society of Korea Conference
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• 2007.02a
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• pp.56-57
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• 2007

• Proceedings of the Optical Society of Korea Conference
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• 2005.07a
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• pp.212-213
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• 2005

• Proceedings of the Optical Society of Korea Conference
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• 2008.02a
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• pp.225-226
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• 2008

• Proceedings of the Korea Association of Information Systems Conference
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• 2005.12a
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• pp.367-378
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• 2005

온라인 중심의 정보기술 패러다임이 모바일 중심으로 진전되고 있으며 향후 유비쿼터스 환 경으로 나아갈 것으로 예견된다. 본 연구는 의미, 인간생활과의 적합성, 제공 서비스, 제약 환경 측면에서 6개의 유비쿼터스 특성요인을 도출하고, 이들이 모바일 환경의 성숙과 더불어 활성화되고 있는 모바일서비스의 사용의도에 미치는 영향을 실증하였다. 분석 결과 6개 의 특성요인은 모바일서비스 사용의도에 직간접으로 유의함이 확인되었다.