• Proceedings of the KSME Conference
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• 2004.04a
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• pp.1475-1480
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• 2004

Plasma Enhanced Chemical Vapor Deposition (PECVD) process uses unique property of plasma to modify surfaces and to achieve the high deposition rates. In this study, a vertical thermal RF-PECVD (Radio Frequency-PECVD) reactor is modeled to investigate thermal flow and the deposition rates with various shapes of the showerhead. The showerhead in the CVD reactor has the shape of a ring and gases are injected in parallel with the susceptor, which is a rotating disk. In order to achieve the high deposition rates, we have simulated the thermal flow fields in the reactor with several showerhead models. Especially the effects of the number of injection holes and the rotating speed of the susceptor are studied. Using a commercial code, CFDACE, which uses FVM (Finite Volume Method) and SIMPLE algorithm, governing equations have been solved for the pressure, mass-flow rates and temperature distributions in the CVD reactor. With the help of the Nusselt number and Sherwood number, the heat and mass transfers on the susceptor are investigated. In order to characteristics of measure the flatness of the layer, furthermore, the relative growth rate (RGR) is considered.

• Proceedings of the SAREK Conference
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• 2006.11a
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• pp.111-111
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.561-562
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• 2006

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.04a
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• pp.117-118
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• 2002

본 연구에서는 지하수로부터 방출된 실내라돈오염을 해석하기 위한 수학적 모델에서 모델인자들의 불확실성을 고려하고 인체축적량을 정량적으로 해석하는 PBPK모델을 사용하여 호흡을 통한 라돈의 인체축적량을 보다 현실적으로 평가하려고 한다. 우선, 전에 사용한 3 구역모델을 샤워실과 화장실을 구분하는 경계가 없다는 국내실정을 감안하여 보다 현실적으로 개량한 2-구역 모델을 개발하였다. (중략)

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.1007-1008
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• 2010

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.27 no.5
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• pp.456-460
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• 1998

얼마 전 영국 왕실 소속의 과학 위원회에서 오랜 연구 결과를 토대로 작성된 보고서 "21세기 위생 백서"에 의하면 21세기에 가장 무서운 무기는 핵무기나, 에너지나, 식량이 아니라 "음료용 물"이 될 것이라고 결론을 맺고 있다. 우리 역시 이제까지 물은 흔하고 구하기 쉬워 값이 싼 것으로 알아 왔으며, 절약이라는 말을 많이 사용하면서도 물에 대해서만은 예외를 인정해 왔던 것이 사실이다. 최근 물에 대한 정책 당국에서도 우리나라는 "수자원이 부족한 나라이고, 머지않아 물 부족 사태가 발생할 것"임으로 물을 절약해야 한다는 홍보를 시작한 바 있다.

• Archives of design research
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• v.15 no.3
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• pp.149-156
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• 2002

Through academic-industrial collaboration program, special knowledge and human resources in the university are utilized in the society and it may contribute to the development of industry and enhance the competitiveness of the corporation to the activation and acceleration of the regional economy and finally to the enhancement of competitiveness of national industry in international level. This study is based upon design process for the development of body-shower product for bath room, and expected to be used as an important educational material for establishment of order-based education system which conforms to the job site needs that may be analysed from feedback of product results and for practical learning.

• Analytical Science and Technology
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• v.13 no.4
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• pp.412-422
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• 2000

The polymeric FAB materials of air shower used in clean room of wafer industry have been outgassed with the dynamic headspace (ca.$100^{\circ}C$) for half an hour, and analyzed using GC-MS. The air in the clean room running air shower was sampled using sorbent tube method, and the organic compounds adsorbed in the sorbent tube were extracted using Soxhlet extraction method, and analyzed using GC-MS. The analytical results from FAB materials of air shower (electric over current relay, acryl plate. polycarbonate window, filter, fan housing, steel galvanized cold plate and canvas buffer) indicated that most of chemicals were originated from polymer fragments of FAB materials. Their analytical results have been compared with those from the air of clean room running air shower. These comparative results could lead to identify whether the sources of trace organic contaminants in clean room air are originated from the polymeric FAB material of air shower.

• The Bulletin of The Korean Astronomical Society
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• v.33 no.1
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• pp.45.1-45.1
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.919-922
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• 2005

Generally, we take a bath to obtain a clean body as well as a good health. Human body generates various physical and emotional changes by stimulations of therapeutic effect of heat and hydraulic pressures. Accordingly, we can obtain not only relaxations but also effects of hydrotherapy. The survey of bathing/showering behaviors and therapeutic effect of heat reactions present elementary data for development of a bathing/showering system. However, there are few existing data for bathing/showering behaviors and effects. Consequently, surveys were performed to know patterns of bathing and showering, and relations between physiological changes and water temperature were examined by partial bathing on human body in this study.