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유동층을 이용한 유 , 무연탄 혼합 연소로에서 대기오염물질 생성과 연소효율 연구
조상원,민병철 ( Sang Won Cho,Byoung Chul Min ) 한국공업화학회 1997 공업화학 Vol.8 No.3
본 연구는 유동충연소로에서 유,무연탄 혼합연소시 대기오염물질 발생과 연소효율에 관하여 실험하였으며, 실험결과는 다음과 같다. 유동층연소로 높이가 증가할수록 이산화황과 질소산화물의 농도는 증가하는 것으로 나타났으며, 무연탄 혼합비가 증가할수록 이산화황의 농도는 증가하였으나 질소산화물농도는 큰 변화가 없었다. 무연탄 혼합비가 증가할수록 비산유출율도 증가하였고 주입 가연성분에 대한 유출 가연성분비도 증가하였다. 또한, 무연탄 혼합비에 관계없이 비산유출입자의 평균입경에 따른 미연분 함량은 미세입자에서 대체로 높게 나타났다. 한편, 연소효율은 층온도 850℃ 이상과 과잉공기 20% 이상에서 큰 차이를 보이지 않았으므로 유속 0.3m/s, 층온도 850℃, 과잉공기비 20%의 조건으로 혼합연소시키는 것이 적절한 것으로 나타났다. We have been studied that combustion efficiency and the production of air pollution of anthracite-bituminous coal blend in a fluidized bed coal combustor. Also, the reaching time of steady state condition have been studied. This experimental results are presented as follows. As the height of fluidized bed combustor becomes higher, the concentrations of SO₂ and NO_x mainly increased. Also, as anthracite fraction increased, the emission of SO₂ concentration was increased but, the variation of NOx concentration was negligible according to anthracite fraction. When anthracite fraction ratio was increased, elutriation rate was increased and exit combustible content over feeding combustible content was increased. Regardless of anthracite fraction ratio the uncombustible weight percentage according to average diameter of elutriation particles were approximately high in the case of fine particles. Over bed temperature 850℃ and excess air 20%, the difference of combution efficiencies were little. It is estimate that the combustion condition in anthracite-bituminous coal blend combustion is suitable at the velocity 0.3 m/s, bed temperature 850℃, the excess air 20 %.
사과 추출물의 구취억제효과에 대한 Polyphenol Oxidase의 영향
조상원(Sang-Won Cho),곽기석(Ki-Suk Kwak),이주항(Joo-Hang Lee),윤영수(Young-Soo Yun),구연숙(Yeun-Suk Gu),지청일(Cheong-Il Ji),이두석(Doo-Seog Lee),이양봉(Yang-Bong Lee),김선봉(Seon-Bong Kim) 한국식품영양과학회 2001 한국식품영양과학회지 Vol.30 No.6
본 연구는 사과의 구취억제인자를 구명하기 위한 기초자료로써 사과 추출물의 획분에 따른 사과에서 추출한 PPO의 methyl mercaptan에 대한 구취억제활성을 조사하였다. 사과를 착즙하여 구취억제활성을 측정해 본 결과, 사과 고형분의 농도가 증가함에 따라 구취억제활성이 증가하는 경향을 나타내었다. 사과의 저분자획분에 PPO를 첨가한 경우, 저분자획분의 농도증가 및 반응시간에 따른 methyl mercaptan에 대한 구취억제활성이 증가하는 경향을 나타내었다. 이상의 결과는 사과에서 추출한 PPO에 의한 갈변반응의 중간체로 생성되는 o-quinone이 methyl mercaptan과 결합하여 methyl mercaptan을 비휘발성으로 전환시켜 구취억제활성을 나타내는 것으로 생각된다. Deodorizing activity of polyphenol oxidase (PPO) extracted from apples was investigated by measuring the changes of methyl mercaptan as an indicator of halitosis in human mouths. In the studies of apple extracts on deodorizing activity, the deodorizing activity was increased with the amount of apple extracts. In the cases of adding PPO to the low molecular fraction of apple extracts, the deodorizing activities were increased with the amount of the low molecular fraction of apple extracts and the reaction time of the extracts with PPO. Deodorizing activities of PPO is thought that o-quinone as an intermidiate produced by an oxidative reaction of PPO during enzymatic browning reactions may react with methyl mercaptan to form a non-volatile and sulfur-containing compound.
고온용융 열분해를 위한 도시 고형폐기물의 쓰레기 특성과 압축에 관한 연구
조상원(Sang Won Cho),오광중(Kwang Joong Oh) 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.1
In Korea, most of M.S.W. is disposed by landfill. But, it is limited because of problems as small land, leachate, odor etc. And, direction combustion has some problems like secondary air pollution. In comparison with landfill and direction combustion, Thermoselect Process should have solved these problems. The experimental results were as follows ; The heating value of M.S.W in this study was 1,543 kcal/kg. And, according to the compression of M.S.W., moisture contents reduced from 75% compression ratio and the maintenance of compressed shape was possible from 80% compression ratio.
조상원(S. W. Cho),김아정(Ajung Kim),최진식(J. S. Choi) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.2
본 논문에서는 무선 및 이동통신을 위한 클라우드 무선 가입자 네트워크를 지원하는 프론트홀에서 무선 라디오파의 광섬유 전송망의 기술을 제안하고 구현한다. 하향 링크는 OFMD (orthogonal frequency division multiplexing) (O기법을 사용하였고 상향방향의 전송은 SC-FDMA (single carrier-frequency multiple access) 방식으로 구현하였다. 64, QAM, 16QAM, QPSK 등 다양한 변조 방식에 대해 시스템 파라메터를 도출하고 측정치를 기반으로 성능을 분석하였다. In this paper, we propose a Radio over Fiber system for small cell applications and for mobile fronthaul networks supporting cloud-radio access networks(RAN). We built a system with a downlink employing orthogonal frequency division multiplexing (OFDM) techniques and an uplink using single carrier-frequency multiple access(SC-FDMA). System parameters are evaluated for various subcarrier modulations and the results of link performance measurements are analyzed.
육미지황탕증(六味地黃湯證)의 병인론(病因論)적 분석을 위한 설문문항(說問問項) 개발(開發)
조상원 ( Sang-won Cho ),박영재 ( Young-jae Park ),김민용 ( Min-yong Kim ),오환섭 ( Hwan-sup Oh ),박영배 ( Young-bae Park ) 대한한의진단학회 2008 大韓韓醫診斷學會誌 Vol.12 No.2
Background: Yukmijiwhang-tang is one of the most common herbal formulas in Oriental Medicine. Yukmijiwhang-tang has been widely used as a herbal medicine to replenish Yin and tonify the kidneys for hundred years in Asian countries. Because of insufficiency in data, objective judgements about remedial effects have been difficult. In order to make objectivity diagnostic data, this research is developed. Purpose: The aim of the research is to make a pilot questionnaire for clinical use of Yukmijiwhang-tang. Methods: The questionnaire which includes symptoms and signs for Yukmijiwhang-tang is studied by the Delphi method. Results: By the Delphi method and score evaluation, 30 items of the initial copy of questionnaire are chosen for the research. Conclusions: By the Delphic survey among clinicians, a reference questionnaire for Yukmijiwhang-tang applications was suggested. Further research is necessary for modification of questionnaire by statistics and certification by clinical trial. research.
조상원(SW Cho),김일선(IS Kim),이계용(KY Lee),유형재(HJ Yoo),이종현(JH Lee) 대한산부인과학회 1984 Obstetrics & Gynecology Science Vol.27 No.12
Ten cases of vaginal or vulvar injury by coitus, which were treated at this hospital during the period of 5 years from 1978 were analysed. 1. The site of coital injury was noted at the right side of lower genital tract in 8 cases, and noted at the left side only in 1 case. 2. The etiological factors of coital injury were rape(4 cases), abnormal coital positions(2 cases), probably weakened vaginal wall tissue during postpartum and lactating period(3 cases), and 2 cases were nonspecific. 3. The management of coital injury was performed by gauze packing or suturing and its result was excellent. 4. The prognosis was good in all cases.