• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1994.06f
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• pp.53-63
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• 1994

• The KSFM Journal of Fluid Machinery
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• v.7 no.5 s.26
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• pp.68-72
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• 2004

• The KSFM Journal of Fluid Machinery
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• v.7 no.5 s.26
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• pp.73-77
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• 2004

• The KSFM Journal of Fluid Machinery
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• v.7 no.5 s.26
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• pp.78-81
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• 2004

• Particle and aerosol research
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• v.19 no.3
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• pp.53-62
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• 2023

This study compared the collection efficiency of a two-stage electrostatic precipitator (ESP) with a lightweight PET film-coated carbon electrode collector plate, depending on the relative humidity of the exhaust gas and the applied voltage to the pre-charger. It was confirmed that the onset voltage at which corona discharge occurs decreases and the discharge current decreases at the same voltage as the relative humidity increases. On the other hand, even though there was almost no change in the diameter of the particles generated depending on the relative humidity, the efficiency was higher at the same voltage as the relative humidity increased. In addition, by applying a two-stage ESP structure, the collection efficiency was higher than that of a single-stage electrostatic precipitator under the same conditions. The ESP using the carbon electrode coated with PET film used in this study is expected to be effective in various aspects such as weight and in the current situation where environmental regulations are rapidly tightening.

• Particle and aerosol research
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• v.12 no.3
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• pp.73-80
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• 2016

Bioaerosol inactivation becomes important as people recognize the significance on the health effects of bioaerosols. There are several ways to inactivate such bioaerosols such as antimicrobial filters, UV, etc. For the on-filter-inactivation, proper antimicrobial materials coating should be applied. Recently, air ions are adopted to effectively reduce germ and virus activity. Limitations arise when each method is applied separately. Coating materials can experience chemical instability over time and temperature. Ionizers can generate ozone to prepare high ion concentrations. Combinations of developed techniques to enhance the inactivation efficiency were suggested. Researches on the air sterilization are reviewed and outlook is highlighted. Proper techniques such as combinations of filter material coating and air ion generation can be used to make air quality better for human living.

• International Journal of Fluid Machinery and Systems
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• v.7 no.3
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• pp.125-129
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• 2014

The paint removal and recoating are the very important process in airplane maintenance. The traditional technology is to use the chemical way corroding the paint with paint remover. For changing the defects, corrosion & pollution & manual working, of the traditional technology, the physical process which removes the paint of airplane with 250MPa/250kW ultra-high pressure rotary water jetting though the surface cleaner installed on the six axes robot is studied. The paint layer of airplane is very thin and close. The contradiction of water jetting paint removal is to remove the paint layer wholly and not damage the surface of airplane. In order to solve the contradiction, the best working condition must be reached through tests. The paint removal efficiency with ultra-high pressure and move speed of not damaged to the surface. The move speed of this test is about 2m/min, and the paint removal efficiency is about $30{\sim}40m^2/h$, and the paint removal active area is 85-90%. No-repeat and no-omit are the base requests of the robot program. The physical paint removal technology will be applied in airplane maintenance, and will face the safety detection of application permission.

• Particle and aerosol research
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• v.10 no.1
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• pp.27-31
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• 2014

A simple bimodal model has been developed to analyze charged particle coagulation by modifying previously suggested bimdal model for evolution of particle generation and growth. In the present model, two monodisperse modes are used and 40 charge nodes are assigned to each mode to account both change of the particle size and charge distribution. In addition, we also implemented the effect of electrostatic dispersion loss in the present model. Based on the developed model, we analyzed coagulation of asymmetric bipolar charged particles by computing evolutions of particle number concentration, geometric mean diameter of particles, charge asymmetric ratio and geometric standard deviation of particle size distribution for various initial charge asymmetric ratios. The number concentration of asymmetric bipolar charged particles decreases faster than that of neutral particles but that does not give faster growth of particles since the electrostatic dispersion loss overwhelms particle growth by coagulation.

• Particle and aerosol research
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• v.14 no.1
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• pp.9-16
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• 2018

We have developed an electrostatic precipitation (ESP) type air cleaner for indoor air quality and investigated its performances regarding CADR (Clean air delivery rate), single-pass efficiency and gas removal efficiency. The ESP air cleaner used an ACF (Activated carbon fiber) filter for gas removal and the ACF as a high voltage electrode for particle removal. The ESP air cleaner was tested in a chamber with the volume of $1m^3$ regarding CADR and gas removal efficiency. The applied CADR area of the ESP was $1.8m^2$. Gas removal efficiency was tested with 3 gases (Acetaldehyde, Acetic acid, Ammonia). As the results of the gas removal efficiency, the ESP air cleaner shows the removal efficiencies of 90, 98 and 85% for acetaldehyde, acetic acid and ammonia, respectively.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.172-172
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• 2017

최근 급변하는 농촌인구 감소와 고령화로 인한 농업농촌의 경쟁력 향상을 위해 농업에 정보통신기술(ICT)을 접목한 스마트 팜 기술개발이 추진되고 있다. 현재 농촌진흥청에서는 한국형 스마트 팜 ICT 기자재 표준규격을 개발하고 단체 표준을 제정하고 있다. 개발된 시설원예용 기자재 중 센서 13종, 구동기 9종 그리고 환경제어용 3종 등 총 25종의 표준규격에 대한 검정이 요구되어, 표준규격 부합 여부를 객관적으로 확인하기 위한 검인증 체계 구축을 필요로 하게 되었으며 본 연구에서는 표준규격이 설정된 기자재에 대한 검인증방법과 계측시스템을 구성하여 검인증체계를 구축하고자 하였다. 센서 13종 중 온도센서는 비교시험을 하기위해 기준 온도센서가 정밀도는 $0.01^{\circ}C$, 정확도는 ${\pm}0.01^{\circ}C$를 갖는 것으로 선정하고 항온조는 작동범위가 온도는 $(-)50{\sim}(+)120^{\circ}C$, 습도는 (30 ~ 98)%R.H.로 조절이 되는 구조의 것으로 구성하여 기준센서와 오차정도를 산출하는 방법으로 실시할 것이며, 센서 인터페이스 등 구조는 T.T.A. 단체 표준에 적합여부를 확인하여 적합성 여부를 판단하고 현재까지 센서 13종과 구동기 9종에 대한 검정방법 제정을 추진하고 있다. 지금까지는 스마트 팜 중 시설원예용 기자재 표준규격 부합여부를 확인하는 수준이지만 향후 개별 성능확인 호환성 확인시험방법을 추가하여 고도화를 추진 하고자 한다.