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Electrodelss Plasma Torch Powered by Microwave and Its Applications
홍용철(Hong, Yong-Cheol),전형원(Jun, Hyung-Won),노태협(Lho, Tai-Hyeop),이봉주(Lee, Bong-Ju),엄환섭(Uhm, Han-Sup) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
A microwave plasma torch at the atmospheric pressure by making use of magnetrons operated at the 2.45 GHz and used in a home microwave oven has been developed. This electrodeless torch can be used to various areas, including industrial, environmental and military applications. Although the microwave plasma torch has many applications, we in the present work focused on the microwave plasma torch operated in pure steam and several applications, which may be used in future and right now. For example, a high-temperature steam microwave plasma torch may have a potential application of the hydrocarbon fuel reforming at one atmospheric pressure. Moreover, the radicals including hydrogen, oxygen and hydroxide molecules are abundantly available in the steam torch, dramatically enhancing the reaction speed. Also, the microwave plasma torch can be used as a high-temperature, large-volume plasma burner by injecting hydrocarbon fuels in gas, liquid, and solid into the plasma flame. Lastly, we briefly report an underway research, which is remediation of soils contaminated with oils, volatile organic compounds, heavy metals, etc.
알코올 발효성 야생 효모, Aureobasidium pullulans P-1의 균학적 특성과 막걸리 발효 특성
홍용철 ( Yong-cheol Hong ),한상민 ( Sang-min Han ),이종수 ( Jong-soo Lee ) 한국균학회 2018 韓國菌學會誌 Vol.46 No.3
The goal of this study was to investigate the microbiological characteristics of the ethanolproducing wild yeast, Aureobasidium pullulans P-1, isolated from flowers growing near the Yedang reservoir, Chungnam province, Korea, and in addition, to optimize its fermentation ability for the production of Makgeolli. A. pullulans P-1 was oval-shaped, and formed ascospores and pseudomycelium. The P-1 strain was a halophilic and sugar tolerant yeast which grew in 15% NaCl and 50% glucose-containing yeast extract-peptone-dextrose media. The P-1 strain was also resistant to 20% ethanol. Changes of the physicochemical properties during Makgeolli fermentation by A. pullulans P-1 were investigated. A maximum of 8.45% ethanol was obtained when a mixture of cooked rice, 150% water, and 35% ipguk per cooked rice was fermented by 5% A. pullulans P-1 culture broth at 25°C for 10 days. Antihypertensive angiotensin I-converting enzyme inhibitory activity in the Makgeolli ferment produced by A. pullulans P-1 reached a high of 71.1% after 10 days.
김강일(Kangil Kim),홍용철(Yong Cheol Hong),김근영(Geunyoung Kim),양상식(Sang Sik Yang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper presents an atmospheric micro glow plasma-jet device. The device consists of four components; a thin Ni anode, a porous alumina insulater, a stainless steel cathode and an aluminum case. The Ni anode is fabricated using micromachining technology. The anode has 10 holes, of which the hole diameter and the depth are 250 ㎛ and 60 ㎛, respectively. The discharge test is performed in nitrogen gas at atmospheric pressure for 20 ㎑ AC bias. The breakdown voltage is 3.5 ㎸ at gas flow rate of 4 L/min and the the plasma-jet is blown out to ambient at 5.5 ㎸. In order to verify the characteristics of plasma, the current and the voltage of device are measured. The maximum temperature of plasma is 37 ℃. The plasma is well generated and stable at high voltage.
전자파 플라즈마 토치를 이용한 이산화탄소와 메탄의 Syngas 합성
신동훈(Dong Hun Shin),홍용철(Yong Cheol Hong),엄환섭(Han Sup Uhm) 한국에너지학회 2004 한국에너지공학회 학술발표회 Vol.2004 No.-
Carbon dioxide (CO₂) and methane (CH₄) are two major greenhouse gases. CO₂is a stack gas of many industrial processes and the main product of the hydrocarbon combustion. There is recent research interest on the synthesis gas (syngas) formation from CO₂and CH₄via the following reaction: CH₄+ CO₂-> 2H₂+ CO, in order to reduce the greenhouse effects and to synthesize various chemicals, Preliminary experiments were conducted on the conversion of CO₂and CH₄to syngas by making use of a microwave plasma torch at atmospheric pressure. Conversion rates of CO₂and CH₄to hydrogen (H₂), carbon monoxide (CO) and higher hydrocarbons were investigated using Gas Chromatography (GC) and Fourier Transform Infrared (FTIR). The experimental data indicate that the main products were H₂, CO and small amount of higher hydrocarbons, such as ethylene (C₂H₄).
방사선 그라프트 중합법을 이용한 이온교환 필터의 살균효과
김예진 ( Ye Jin Kim ),홍용철 ( Yong Cheol Hong ),김민 ( Min Kim ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.3
We studied the pasteurization effect of the microorganism involved in the water, using ion-exchanging filtermade of the Radiation Induced Grafted Polymerization. This ion-exchanging filter is made by the graft polymerizationof GMA, after irradiation of electron beam to the non-woven filter. Then, we made the ion-exchanging filter (EtA, DEA,SS) applying ion-exchanging base to the GMA filter. As a result, the density of the ion-exchanging base is shown as2.38 mol/kg in case of EtA, 1.79 mol/kg in case of DEA and 0.75 mol/kg in case of SS. Through this filter made by thismethod, we measured the pasteurization power of E. coli. We found very high elimination rate such as log 4.65 in caseof SS-dial filter, which is higher as 3.00 times in comparison with EtA, and 1.10 times in comparison with DEA. Thisdata show the result is very excellent comparing with 3,000 CFU/ml. of city water treatment basis.
김예진 ( Ye Jin Kim ),홍용철 ( Yong Cheol Hong ),이상주 ( Sang Ju Lee ),이봉주 ( Bong Ju Lee ) 한국공업화학회 2011 응용화학 Vol.15 No.2
Underwater plasma is formed from a tungsten electrode inserted in a narrow dielectric capillary. Plasma is formed by electrical breakdown. It is produced with atomic oxygen, atomic hydrogen, and hydroxyl ion by the dissociation of vapor. It is also formed of chemical agents like chlorine gas, hypochlorousacid, hypochloriteion and free available chlorine, which are useful sterilization substances. The energy yield was decreased by injecting the gas (N2, Ar, and O2) into a electrode. In this context, the plasma is formed from a electrode by approximately 55% energy levels.
바이오-메디컬 응용을 위한 마이크로 플라즈마 분사 소자
김강일(Kangil Kim),홍용철(Yong Cheol Hong),김근영(Guenyoung Kim),양상식(Sang Sik Yang) 대한전기학회 2009 전기학회논문지 Vol.58 No.12
This paper presents an atmospheric microplasma-jet device for bio-medical application. The microplasma-jet device consists of four components; a thin Ni anode, porous alumina insulator, a stainless steel cathode and an aluminum case. The anode has 8 holes, and hole diameter and depth are 200 ㎛ and 60 μm, respectively. The discharge test was performed in atmospheric pressure using nitrogen gas and AC voltage at the optimum gas flow rate of 4 l/min. The plasma-jet is ejected stably for the input voltage ranging from 5.5 to 9.5 ㎸p-p. The plasma becomes dense as the input voltage increases, which was verified by the hydrophilicity change of PMMA surface treated by the plasma. The temperature increasement of the aluminum film exposed to plasma-jet illustrates that the micro plasma-jet device is feasible for bio-medical application.