• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.143-146
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• 2009

소형엔진은 매우 열악한 환경에서 작동하게 되는데, 이러한 엔진으로 흡입되는 공기를 정화하는 흡기시스템은 매우 중요한 설계인자이다. 본 연구는 이러한 소형엔진에 적용하기 위한 흡기시스템을 개발하고, 효율적인 개발 업무를 진행할 수 있도록 하는데 그 목적을 두었다. 기초 자료를 확보하기 위하여 3가지의 기본 모델을 제작하였다. 이를 바탕으로 유동 해석 및 엔진 특성 분석을 통해 기존 사양 대비, 우수한 성능을 보이는 모델을 제시하였다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.23-24
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• 2018

Most finishing materials are vulnerable to durability, humidity resistance and fire. And those products used formaldehyde to protect, during the manufacturing process. Also most finishing materials used adhesives to construction process indoor. All of these elements are major causes of releasing formaldehyde. In this study, concrete used by phytoncide was examined to remove the formaldehyde. As a result of the experiment, we found that compressive strength was increased and formaldehyde effectively removed by using mixture of cement matrix and phytoncide.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05b
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• pp.103-108
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• 2003

산업화에 기인하여 공장 및 수송수단 증가로 대기배출가스량이 증가 그 결과 대기오염이 심화되어 가고 있다. 그러므로 실내오염가스의 정화가 우선적으로 고려되어야 하므로 이러한 오염된 공기를 제거 할 수 있는 장치의 개발이 절실히 요구되어지고 있다. 본 연구는 환경오염물질 제거를 위한 선 대 평판형 플라즈마 반응기 제작에 필요한 최적조건을 도출하기 위하여 반응기 내부의 전위 및 전계분포에 대한 시뮬레이션을 하였고 여기서 도출된 결과를 바탕으로 플라즈마 반응기를 제작하고자 한다.

• Proceedings of the Safety Management and Science Conference
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• 2011.04a
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• pp.205-227
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• 2011

On this study, the test for air-purification was executed as using the UV lamp and the UV lamp on which the TiO2 catalyst had been deposited with glass fiber in the reactor chamber. It aimed at the basic data of air-purifier as assessing the features of removing abilities for various contaminants including CH3COOH, NH3, NO, and SO2 as varying the number of TiO2 coating, the wave of UV lamp, and the amount of additive CaO as variables.

• Journal of Environmental Science International
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• v.13 no.12
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• pp.1059-1065
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• 2004

Bio sparging experiments were conducted in a laboratory column to investigate the potential removal of diesel contaminated groundwater. The objectives in this study were (a) to determine the extent of diesel degradation in laboratory columns under supplement of nutrient; (b) to determine the effect of variation of air flow in the removal of diesel and (c) to evaluate the potential enhancement of diesel degradation as a function of temperature. Our results showed that the nutrient supplement and higher air flow greatly enhanced diesel degradation. However, the variation of water temperature examined slightly increased degradation rate of diesel fuel.

• Restorative Dentistry and Endodontics
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• v.13 no.2
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• pp.253-263
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• 1988

In order to study the cleansing effect of air-driven sonic system, the author prepared root canals on 48 extracted human permanent single rooted teeth using hand instrumentation and aforementioned method, half and half of the cases. In order for comparison of the degree of remnant debris and cleanliness, the cross sections at 3mm and 7mm levels from the apex were stereomicroscopically observed and scored in accordance with predetermined degree. The obtained results were as follows: 1. Air-driven sonic system was more effective in cleansing root canal than hand instrumentation at apical 3mm level. (p < 0.01) 2. Air-driven sonic system was more effective in cleansing root canal than hand instrumentation at apical 7mm level. (p < 0.01) 3. In hand instrumentation, Helisonic file was more effective in cleansing root canal than Rispisonic file. (p < 0.05) In air-driven sonic system, on the other hand, there were no significant difference between the two files.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.11a
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• pp.29-30
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• 2018

The development of the industry has increased the indoor living time of modern people. Therefore, indoor pollution is attracting attention as a social issue. One of the indoor air pollution is formaldehyde. Formaldehyde has been classified as a first-level carcinogen by international cancer research organizations. Formaldehyde has been used to protect products such as construction materials and finish materials, and being diffused in the interior construction process. In this study, we used phytoncide with cement matrix to reduce formaldehyde, an indoor environmental contaminant. The strengths was increased slightly and formaldehyde showed a reduction effect over time.

• Proceedings of the KAIS Fall Conference
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• 2006.11a
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• pp.317-320
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• 2006

본 연구는 고효율의 광촉매 제조와 그것의 환경적 응용에 관한 것이다. 가시광 영역에서도 $TiO_2$와 유사한 빛 흡수와 광분해속도를 갖는 나노 광촉매를 제조하였고, 낮은 온도에서도 활성 높은 rutile상이 형성하는 $SiO_2$위에 분산된 $TiO_2$광촉매를 제조하였다. 또한, 광촉매에 적용 가능한 바인더와 안정한 $TiO_2$ 광촉매 졸을 제조하였다. 이와 같은 물질들은 자외선/가시광선 분광광도계, X선 회절분석기, SEM, 광촉매활성 측정과 $TiO_2$ 코팅 표면의 물성으로 평가하였다. 이 결과들은 공기정화를 위하여 POF나 금속판을 이용하는 효율적인 광전자촉매시스템에 적용 할 수 있다.

• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.347-349
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• 2003

Photoelectrocatalytic system is based on the idea that the photogenerated electrons in a layer of TiO$_2$ would move toward a cathode with application of high voltage across the TiO$_2$ coated aluminum plate. In this system, aluminum plate is used as a substrate for TiO$_2$ and also serves as a cathode. According to our scheme, moving photogenerated electrons toward a cathode would have the same effect as moving these electrons away from the holes, which would have the effect of retarding recombination of photogenerated electrons with holes. Recent experiments on benzene and toluene showed higher rates of removal with high voltage on compared to high voltage off, which supported our scheme partially.

• Proceedings of the Safety Management and Science Conference
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• 2008.11a
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• pp.247-258
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• 2008

우리나라는 2000년에 제조물책임법이 제정하여 2002년 7월 1일부터 시행하였으며, 제조물의 제조, 설계, 표시등의 결함으로 인하여 발생한 손해에 대한 제조업자 등의 손해 배상책임을 규정하고 소비자의 결함 입증부담 경감과 피해자의 보호를 도모하자 하고 있다. 제조물의 표시등의 결함은 지시결함이나 경고결함에 관한 것으로 제조자는 그 위험에 의한 사고를 방지 회피할 수 있도록 소비자에게 정보를 제공하여야 하나 이를 이행하지 않아 발생된 결함이다. 본 논문에서는 A사(社)의 공기정화기 B모델 사용설명서에 나타난 정보제공사항을 주의 경고표시 가이드 등에 따라 검토하였으며, 그 결과 일부 지시 및 경고사항에서 보완해야할 사항이 발견하였다. 보완사항은 제안사항으로 기업내부 에서 처리하되 전문성이 부족한 분야는 외부의 PL전문가의 협력하에 바람직한 개선안이 도출될 수 있을 것이다.