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TiO₂로 침착시킨 활성탄을 이용한 유기화학물질의 제거에 관한 연구
鄭文鎬,尹鏞泰 서울大學校 保健大學院 1996 國民保健硏究所硏究論叢 Vol.6 No.2
This study has been designed to conduct isotherm tests of Trichloroethylene with activated carbon coated with TiO_2, ZnO and TiO_2·ZnO and then to analyze the effect of the removal of Trichloroethylene using activated carbon coated with 3,063 ㎍ TiO_2/g AC. The results are as follows. 1. Adsorption capacity of activated carbon coated with 3,063 ㎍ TiO_2/g AC was improved. It is reflected not only as an increase in Freundlich adsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 2. Adsorption capacity of activated carbon coated with 38,718 ㎍ ZnO/g AC was improved. It is reflected not only as an increase in Freundlich adsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 3. Adsorption capacity of activated carbon coated with TiO_2·ZnO was not improved. 4. Using activated carbon coated with 3,063 ㎍ TiO_2/g AC, the concentration of TCE by UV light was not changed. It is because of the effect of background organic material (methanol). 5. Using activated carbon coated with 3,063 ㎍ TiO_2/g AC, the concentration of Cl^- by UV light was not changed. It is also because of the effect of background organic material (methanol).
각 염으로 침착시킨 활성탕을 이용한 수중 Trichloroethylene의 제거에 관한 연구
김영규,윤용태 용인대학교 자연과학연구소 1996 自然科學硏究所論文誌 Vol.1 No.1
This study has been designed to conduct isotherm tests of Trichloroethylene with activated carbon with TiO₂, ZnO and TiO₂·ZnO and then to analyze the effect of the removal of Trichloroethylene using activated carbon coated with TiO₂. The results are as follows. 1. Adsorption capacity of activated carbon coated with TiO₂(T-3) was improved. It is reflected not only as an increase in Freundlich adsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 2. Adsorption capacity of activated carbon coated with ZnO (Z-3) was improved. It is reflected not only as an increase in Freundlidsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 3. Adsorption capacity of activated carbon coated with TiO₂·ZnO was not improved.
2009년 서울지역 유통 한약재의 이산화황 잔류실태 분석
윤용태,이성득,박애숙,신영,김화순,김유경,최병현 韓國藥用作物學會 2010 한국약용작물학회지 Vol.18 No.5
This study was conducted to investigate the content of sulfur dioxide residues in medicinal herbs in Seoul in 2009. Sulfur dioxide in the samples were determined by Monnier-Williams's modified method. A total of 1,821 samples of 205 different types of herbs were collected from Kyung-Dong Herb markets and Oriental medicine hospitals in Seoul. Of these samples, 642 samples were domestic, and 1,179 samples were imported. Of the 1,821 samples, 61 (3.3%, 31 types) failed to meet the regulations for sulfur dioxide residues of KFDA in medicinal herbs. Among these 61 unsuitable samples, 17 (7 types) were domestic, and 44 samples (26 types) were imported. The content of sulfur dioxide in the domestic medicinal herbs ranged from 0 to 809 mg/kg, while those in imported medicinal herbs ranged from 0 to 4,481 mg/kg. Approximately 84.6% of the samples contained less than 10 mg/kg of sulfur dioxide and about 10.0% of samples contained more than 30 mg/kg of sulfur dioxide.
저온 습식 코팅법에 의한 유연 염료감응 태양전지용 광전극의 제작 및 특성 연구
윤용태 ( Yong Tae Yoon ),김영일 ( Yeong Il Kim ) 한국화상학회 2016 한국화상학회지 Vol.22 No.1
Mesoporous TiO2 thin films on ITO/PEN substrate were prepared from two substantially different sizes of TiO2 nanoparticles by low temperature heat treatment. Using these thin film electrodes, flexible dye-sensitized solar cells(DSSCs) were assembled and their photovoltaic characteristics were investigated. The cell of TiO2 film prepared from the larger nanoparticle of 16 nm showed, as expected, much better photoconversion effciency than that from the smaller nanoparticles of about 5 nm due to the increased porosity and surface area for the same amount of TiO2. However, the photocurrent for the former cell did not increase as much as the amount of the increased surface area compared with the latter cell, which means that the interconnectivity between the nanoparticles in the former cell became poorer than that of the latter cell. When TiO2 film was prepared by mixing the larger nanoparticles and the smaller ones in the ratio of 9:1, the prepared solar cell showed much better photoconversion efficiency than the cell with the larger particles only. This means that the smaller particles increased the interconnectivity between the larger particles by filling the void volume without decreasing the porosity and surface area of the TiO2 film.
달 착륙선 모듈의 로켓 추력조절 및 호버링을 위한 기초 비행시험
윤용태(Yongtae Yun),허정무(Jeongmoo Huh),김주원(Juwon Kim),안병욱(Byeonguk Ahn),정우석(Woosuk Jung),권세진(Sejin Kwon) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
본 실험에서는 달 착륙선 모듈에 추력 조절이 가능한 250 N H₂O₂/polyethylene 하이브리드 로켓과 MCU(Micro controller unit)를 적용하여 기초적인 지상 비행시험을 수행하였다. 지상 비행시험을 위해 PD제어를 이용한 시뮬레이션, 초음파센서의 거리 측정 및 서보모터 각도변환에 따른 밸브 개폐 면적 조절하여 추력조절을 시도하였다. 비행시험 결과를 바탕으로 하여 MCU를 활용한 로켓 추력조절의 시스템 적용 가능성 및 향후 비행시험 개선방안에 대해 고찰하였다. In this experiment, a preliminary flight test was conducted for a lunar module equipped with a 250N-class H₂O₂-polyethylene hybrid rocket engine that allows adjustable thrust and micro-controller unit. First, hovering was simulated through PD control for flight test. Additionally, the throttling valve was tested experimentally on a lunar module using MCU coupled with an ultrasonic sensor and servomotor for controlling the throttle valve opening. Preliminary results demonstrate the feasibility of rocket throttling using MCU and include further improvements based on flight test.