• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.983-986
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• 2007

Concrete surface grinding is required for flatness and adhesiveness of concrete surface. The procedure is, however, labor intensive and has a hazardous work condition. Also, the productivity and the quality of concrete surface grinding depend on the levels of worker. Thus, the development of remote controlled concrete surface grinding equipment is necessary to prevent the environmental pollution and to protect the workers from hazardous work condition. However, it is difficult to evaluate the grinded surface objectively in a remote controlled system. The machine vision system developed in this study takes the images of grinded surface with the network camera for image processing. Then, by representing the quality test results to the graphic MMI program of the remote control station, the quality control system is constructed. The machine vision algorithm means the image processing algorithm of grinded concrete surface and this paper presents the objective quality control standard of grinded concrete surface through the application of the suggested algorithm.

• Journal of Korea Foresty Energy
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• v.20 no.1
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• pp.1-5
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• 2001

In this study, it was examined the effect of carbonized wastewoods on soil improvement and effect of charcoal size on tree seedling growth Thuja accidentalis seedlings grow better in the charcoal-treated soil than in the non-treated soil. Especially Pinus koraiensis charcoal with good adsorption. brought the best growth result. The charcoal treatment also improved the height growth of transplanted Aesuculus turbinate seedling However charcoal sizes(i.e. powder and particle) did not affect the growth of the seedling. Also apple trees which had been suffering from rotten roots caused by root rot was recovered by application particle-sized charcoal.

• The Journal of the Korea Contents Association
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• v.13 no.2
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• pp.505-511
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• 2013

A new boundary treatment technique which can be applied to axi-symmetric topography with inclined bottom was developed. Although the finite element method is good for complex geometry, there is no proper boundary treatment when a boundary is not a vertical section because the water depth at the coastline becomes zero. In this study, we developed a new boundary treatment for inclined bottom using the analytical solution for long wave. To develope a model, the mild-slope equation was used and then, a computational domain is divided into an analytical region and a numerical region. By combining a numerical and an analytical solutions, a complete solution was obtained. The developed solution was validated by comparing with a previous analytical solution.

• 대한치과보철학회:학술대회논문집
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• 1996.11a
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• pp.103-103
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• 1996

• 대한치과보철학회:학술대회논문집
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• 1994.12a
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• pp.44-44
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• 1994

• 대한치주과학회:학술대회논문집
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• 2004.11a
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• pp.103-103
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• 2004

• Journal of the Korean Society for Heat Treatment
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• v.21 no.5
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• pp.265-273
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• 2008

• 보존과학연구
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• s.18
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• pp.42-48
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• 1997

• Proceedings of the Korean Fiber Society Conference
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• 1987.06a
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• pp.68-68
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• 1987

• 대한치주과학회:학술대회논문집
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• 2001.12a
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• pp.39-39
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• 2001