• Proceedings of the IEEK Conference
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• 2000.06d
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• pp.58-61
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• 2000

In this paper, we propose a new performance comparison method of various Interpolation methods for image enlargement The conventional methods employs PSNR and edge characteristic evaluation for performance comparison of interpolation methods. The proposed performance comparison method uses the position Information for each difference pixel's value and the frequency characteristic information between original image and Interpolated image. The proposed methods might be useful for performance comparison of various Interpolation methods through the computer simulation.

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.153-156
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• 2014

This study was aimed to assess combustion stability for coaxial swirl injector and FOOF impinging injector which would be candidates in liquid rocket engine combustors. Simulating combustion tests under atmospheric condition have been conducted by gaseous oxygen and the mixture of methane and propane, using two actual injectors. By analyzing the measured dynamic pressure signals, we have evaluated the combustion stability margin of both injectors by drawing a stability map.

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.331-332
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• 2014

Underground power plant is required the strict safety management and safety assessment. Because it is the high risk of explosion by characteristic of enclosed space. In case gas leak of enclosed space, the ventilation facilities is very important in order to prevent explosion by the maintain less than the LEL(lower explosive limit). Thus, Through a safety assessment of ventilation volume is to reduce the risk for ventilation facilities in Underground power plant.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.35-35
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• 2018

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.141-141
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• 2018

• Korean Journal of Child Studies
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• v.16 no.1
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• pp.3-20
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• 1995

This study assessed the needs and aspirations for after-school programs for 421 employed mothers with a school-age child. Furthermore, 20 cases of after-school programs presently opened in Seoul and Kyungkido were analyzed and evaluated in terms of the factors related to quality of child care programs. A tentative after-school program model was developed on the basis of data from the assesment of parental requests and the evaluation of the present programs. The objectives of after-school programs, program activities, caregiver's role, group constellation, supervision of the programs, and care service time were discussed in the model.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.04a
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• pp.263-268
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• 2004

This study is to improve the quality of electronic weighing machine by providing a reformation plan on currently problems of domestic manufactured nonautomatic weighing instruments, and by test items and criteria considering internal situation on base of identification of quality level of domestic manufactures electronic weighing machine according to the international standards.

• Journal of the Korean Society of Industry Convergence
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• v.8 no.4
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• pp.227-234
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• 2005

In this study an experimental investigation was conducted to assesment of cutting ability for CBN ball end-milling, STD11 and NAK80 materials. The cutting force and surface roughness of the work-pieces were obtained in machining center. The assessment of CBN tools were inspected through the tool dynamotor and SEM. When $30^{\circ}$ negative rake angle, the wear and cutting force were good, surface roughness was better at cutting fluid during CBN cutting.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2007.11a
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• pp.193-198
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• 2007

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2007.11a
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• pp.369-374
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• 2007