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Syngas Reforming in High Temperature Oxy Gasification System
( Chung Kyu Lee ),( Sang In Keel ),( Jin Han Yun ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.1
Pyrolysis or gasification is a traditional waste treatment technology for convenient heat recovery and pollutant gas reduction. Although waste is the main source of new generation energy in Korea, waste extracted resources were only heat and steam at this time. This is caused by low quality syngas for fuel production or chemical raw material. Using oxy-gasification method, tar free and syngas of higher calorific value can be produced. This gasification system can be connected with fuel energy plant or chemical production line. Our research is focused on the catalyst or non-catalyst syngas reforming by water gas shift reaction. Of these, reforming method can be chosen as a required hydrogen concentration, Syngas was supplied from 1.0 ton/day oxy-gasification pilot plant. Gasification temperature was about 1400~1450℃ and RPF was used as a input material. Optimal reforming conditions such as temperature, amount of steam and residential time were investigated. In non-catalyst syngas reforming, conditions of 50% H<sub>2</sub> concentration and 3.0 H<sub>2</sub>/CO ratio can be acquired. And we found that syngas species concentration can be effectively controlled by CO<sub>2</sub> absorption using paper sludge.
Communication Redundancy for Reliability Improvement in an Industrial Monitoring and Control System
Rhyu, Keel-Soo,Chung, Kyung-Yul The Korean Society of Marine Engineering 2004 한국마린엔지니어링학회지 Vol.28 No.8
In development of monitoring and control systems, one of the most important points is to consider a redundancy so that the system can be operated normally although hardware faults are partly occurred. The purpose of this paper is to introduce a monitoring and control system with a redundancy function for I/O servers and communication networks. I/O servers composed with an active server and a standby server. Each server also has 3 communication ports, 2 ports of them were connected to field units and the other 1 port was connected to the other server. Field units have to be constructed to 2 communication ports connected I/O servers through communication lines. Also, server communication module was implemented for analyzing and handling fault elements. and was submodularized for linking easily with a monitoring and control module. An experiment with 2 servers and 2 field units was constructed to demonstrate its effectiveness.
Experimental Study on the Mill Fire Control for High Volatile Sub-bituminous Coal and Biomass
( Sang In Keel ),( Jin Han Yun ),( Chung Kyu Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.1
Because of fire occurrence in mill, coal power plant’s managers and operators are interesting in its safety control. The use of high volatile low grade sub-bituminous coal and biomass is increasingly extended because of imbalance between the worldwide coal supply and demand. Mill-fire has been an important issue. And after the supply of coal biomass mixture, mill fire is more frequent. Now, shutdown of coal and air supplies could be only a way, and an alternative has not been found in suppressing the mill fire. Inside mill conditions are highly fuel-rich, low temperature, and high velocity and non-reactive. It could be a nonreactive system essentially. Nevertheless, occasional fire-occurrence could be attributed to the existence of an ignition source. This study is focused on suppressing the mile fire. The results show that an small amount of CO<sub>2</sub>- or N<sub>2</sub>-mixing with air is very effective in suppressing fire formation even at high temperatures or flying sparks. The results suggest that exhaust gas recirculation into the mill should be an alternative to suppress mill fire.
Choi,Yong-Keel,Hamelin,Claude,Chung,Young Sup,Page,Christian 漢陽大學校 環境科學硏究所 1991 環境科學論文集 Vol.12 No.-
곤충류에 병원성을 갖는(Entomopathogenic) Bacillus sphaericus(BS) 균주들은 43kD 크기의 단백질을 생성하여 활성화 과정을 거친 후 곤충에 치사성을 갖는 40kD 크기의 독성물질로 전환된다. 서로 다른 4종류의 곤충병원성 BS 균주들로부터 분리된 이들 단백질을 2차원 전기영동을 통한 분석 결과, 이들 단백질들은 등전점의 항상성을 나타내었으며, 활성 독성물질과 비활성 독성물질간에 분자량의 차이를 보여 주었다. 이러한 결과는 이들 물질의 활성화, 기작이 균주간에 일정함을 시사한다. Entomopathogenic Bacillus sphaericus(BS) strains produce a 43kD entomocidal protein, converted through activation to a 40kD toxin. Two-dimensional electrophoresis of these proteins from 4 entomopathogenic BS strains reveals constance in pI and molecular weight differences between activated and non-activated toxin. This suggests a common activation mechanism.
정경열(Kyung-Yul Chung),최대석(Dae-Seok Choi),채정훈(Jeong-Hoon Chae),류길수(Keel-Soo Rhyu),이후락(Hoo-Rock Lee) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
In this paper, we present the development result of UV optical filter which is used in detecting systems for occured corona discharge within electric facilities. Fault symptoms are occured with electrical wave, ultrasonic wave, temperature and air discharge. In these ways, we choose the air discharge phenomenon. Corona air discharge can easy observed by solar-blind band pass filter. Therefore we present the solar-blind optical filter applied with various coating technologies.