• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.04a
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• pp.257-258
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• 1999

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.04a
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• pp.151-152
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• 1999

• Proceedings of the Korea Water Resources Association Conference
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• 2005.09b
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• pp.848-849
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• 2005

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2006.10a
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• pp.117-120
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• 2006

• Proceedings of the Korean Environmental Health Society Conference
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• 2001.04a
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• pp.117-118
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• 2001

• 한국도로학회:학술대회논문집
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• 2003.10a
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• pp.69-75
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• 2003

• Proceedings of the Korean Geotechical Society Conference
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• 2003.03a
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• pp.481-484
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• 2003

Sulfide minerals contacted with air and water in coal seam cause oxidation reactions. This oxidation reactions make low pH of groundwater and surface water(Acid Drainage). The reddish brown precipitate collected from the cut slope of the study area was estimated using the X-Ray Diffractometer(XRD). XRD results show that the cut slope was affected by Acid Drainage. The cut slope exposured to Acid Drainage become weak about chemical weathering and defile the appearance of the road. Drainage facilities are very important in Cut Slope under Acid Drainage influence. Reactions between Coal seam and water cause chemical weathering and environmental problem. Therefore It is important to control the transfer paths of groundwater and surface water and to install water collecting facilities

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.511-513
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• 2004

Camera Calibration should certain)y be achieved to take an accurate measurement using image system. Calibration is to prove the relation between an measurement object and camera and to estimate twelve internal and external parameters. In this paper, we suggest that an algorithm should estimate the external parameters from the road image and use a vanishing point's character from parallel straight lines in a space. also, we use Hough Transform to estimate an accurate vanishing point. Hough Transform has one of the advantages which is an application for each road environment. we assume a variety of environments to prove the usability of a suggested algorithm and show simulation results with a computer.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.17 no.5 s.122
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• pp.398-404
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• 2007

In this study, the sensitivity of annoyance was investigated by the subjective jury test for the variations of the frequency components along with various sound pressure levels of sixteen environmental noise sources. Annoyance was, also, evaluated for the road traffic noises. Sound pressure levels were $54{\sim}84\;dB$ which individually divided frequency components with eight bands of equally three bark bands. The results show that vehicle traffic noise is recognized as the most serious environment noise source. The sensitivity of human perception of annoyance in frequency bands is quite different from A-weighting curve. The annoyance found out to be more sensitive in high frequency region and reached its maximum in 3.4 kHz.

• Proceedings of KOSOMES biannual meeting
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• 2004.05b
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• pp.57-60
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• 2004

In this paper, the technology road map, as a useful methodology for the planning of R&Ds in government and/or industries, is introduced Also the road map for the maritime safety technology, which is being developed in KRISO, is discussed as a framework for the planning of national R&D projects in maritime safety.