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음이온 발생을 위한 저온 플라즈마 반응기 개발에 관한 연구
유광훈(Guangxun Yu),채재우(Jae-Ou Chae),김우형(Woohyung Kim),위위(Wei Wei),왕혜(Hui Wang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
To generate negative ion, a small dielectric barrier discharge (DBD) plasma reactor was used in this study and operated by high AC voltage. With increasing of voltage, we can get more negative ions. However unfortunately, if the input voltage is too high, it will also cause formation of ozone which is very harmful to human being health. So the work of finding out the best condition of Voltage and frequency was carried out firstly. After several times of measurement, operating at 20 ㎑ frequency is the best condition generating high ion concentration without ozone. For the purpose of finding out the best reactor structure, two types of surface dielectric barrier discharge (DBD) reactors were examined to produce negative oxygen ions at the conditions of 20 ㎑ frequency. The results indicated that the surface DBD reactor with several small tips showed better characteristics for generation of negative oxygen ions at the same condition.
Experiment study on hydrogen-rich gas generation using non-thermal plasma
왕혜(Hui Wang),위위(Wei Wei),정맹뢰(MengLei Zheng),채재우(Jae-Ou Chae),유광훈(GuangXun Yu) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This is a report of a feasibility study on the reduction of harmful substances such as particulate matters and nitric oxides emitted from diesel engines by using a plasma reforming system that can generate hydrogen-rich gas. In this paper, an exhaust reduction mechanism of the non-thermal plasma reaction was investigated to perform its efficiency and characteristics on producing hydrogen-rich gas. Firstly, we explain briefly the chemistry of hydrocarbon reforming. The experimental system is showed in the second part. Finally, we demonstrate the feasibility of producing hydrogen using non-thermal plasma. The experimental results are focused on the influence of the different operating parameters (air ratio, inlet flow rates, voltage) on the reformer efficiency and the composition of the produced gas.
A Development of Automatically Control of Hazard Lamps of Automobiles
Wei Wei(위위),Jae-ou Chae(채재우),Menglei Zheng(정맹뢰),Ju-Hyen Sim(심주현),Hui Wang(왕혜),Guangxun Yu(유광훈) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Nowadays, with the increasing number of automobiles, there are more and more traffic accidents. Even though with many safety devices installed, careless and inexperienced drivers often fail to take uses of advanced technologies built in the devices. One type of unfortunate and avoidable traffic accidents is when drivers in an emergency situation either forget or have no time to turn on the hazard lamps which play an important role in noticing other drivers to pay their attentions, in the result, a great number of follow-up-accidents happened. We have developed a system that is capable to keep trucking the condition of the automobile, and turn on the hazard lamps automatically when an emergency has occurred. The system is reliable, cheap, and no design changes required for the automobile.