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최창혁,장성호,성낙창,김수생,김영길 東亞大學校生命資源科學大學附設 農業資源硏究所 1994 農業生命資援硏究 Vol.3 No.1
The results of study focused on protein reuse of livestock wastewater sludge are as follows : 1. Generally increasing COD and BOD sludge loading, protein content was a tendency to increase. 2. The more SRT increase, the less protein content sludge was a tendency to decrease. 3. For the purpose of improving treatment efficiency of livestock wastewater and increasing protein products, it was profitable to treat more two-step aeration process than activated sludge process in treatment efficiency and volume.
최인수,이동배,오장균,이영수 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.2
This study was conducted to obtain the information on the low back pain of taxi drivers from June 15, 1990 to June 30, 1990. The target population was 414 taxi drivers in Seoul city. The results were as follows; 1. Mean age of studied drivers was 36.0 years old. 2. The prevalence rate of LBP during past one year was 54.3%, and that of sciatic pain was 19.8%. and that of recent 2 weeks was 30.7% 3. The prevalence rate of low back pain was increasing with the increasing age, and that of sciatic pain was increasing with increasing work times per 1 shift. The drivers of small taxi had lower prevalence rate of low back pain than that of medium sized taxi. 4. The prevalence rate of low back pain was high in the group of unsatisfying for his job, high score of anxiety and driving car having not-comfortable chair. 5. The variables of having significant relation with the low back pain of past one year were kinds of taxi, satisfaction for job, comfortability of chair and score of anxiety. Those with sicatic pain were work times per 1 shift, satisfaction for job, comfortability of chair and anxiety score and those of recent 2 weeks were work times per 1 shift and anxiety score.
손등 정맥 패턴의 회전 왜곡을 보상한 개인 식별 알고리즘의 연구
최환수,안장용 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
This paper proposes an enhanced algorithm for person identification system utilizing hand vein pattern. The conventional algorithm does not cope with distortion caused by image rotation caused by misplaced hands on the imaging device. A straightforward approach to consider the rotaional compensation required too much computational load, thus, we devised an approach to expect the rotation direction along with image translation, reducing the compuational requirement dramatically. In this paper, we present the detail of the algorithm with experimental results with the new algorithm.
채널 식각형 비정질 실리콘 박막 트랜지스터에서 배면에 수소 이온 도핑효과
장진,최종현,이경하,임병천,김창수 慶熙大學校 레이저 工學硏究所 1997 레이저공학 Vol.8 No.-
We have studied the effect of the hydrogen ion doping on the free surface of back channel etched a Si:H TFTs. The hydrogen ion doping on the back channel etched TFT reduces the off-state photo leakage current by one order of magnitude. The reduction of the photo-leakage current is due to the creation of defect states at the free surface by hydrogen ion doping. After hydrogen ion doping on the free surface, the field effect mobility change little, but the threshold voltage increases, which is due to the state creation in a-Si:H by ionized H ions. Furthermore, the off-state leakage current under frontlight illumination can be reduced by 2 orders magnitude by hydrogen ion doping on the back channel of a Si:H TFT.
이재장,최수용 江原大學校 産業技術硏究所 1989 産業技術硏究 Vol.9 No.-
A general study on the upgrading of mica minerals which are mainly found in pegmatite deposits was carried out for the purpose of developing a technique for recovering mica in form of comercial grade products. By the way the grade one of about 5∼6% K2O still is not developed. The target of this research work is to be establish a process for the efficient concentration of muscovite, containing more than 10% K2O. The tests are applied to incraese the recovery and grade of concentrates in term of variations of conditions. The test sample consists of mainly muscovite and gangue mineral such as quartz, pyrite and chlorite. Decantation and shaking table tests were ineffective to up-grade this low grade one, but flotation method gave satisfactory result. By means of grade one, but flotation method gave satisfactory result. By means of grindability tests, an optimum result could be obtained from the sample ground to -48mesh feed size. The flotation result indicates that the dodecyl ammonium chloride used as a cationic collector is effective on the negatively charged surface, while the sodium dodecyl sulfate as an anionic collector is effective on the positively charged surface. Muscovite was floated by petroleum sulfonate as well as amine type collector, it also floated by MIBC as well as pine oil frother under well condition. Fine muscovite concentrates of about 10.68% K2O was obtained with 22.4% yield, by decantation, the muscovite concentrates of 10.10% K2O was obtained with 23.54% yield, by table concentration, the muscovite concentrates of 11.51% K2O was obtained with 23.0% yield by flotation.
學校周邊 道路交通 騷音과 學生 聽感反應과의 相關關係 硏究
김종수,최동훈,박진식,김석택,김장호,서정민 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.2
For my thesis I have analyzed the differences between the traffic noise level surrounding the schools and the perceived level of noise. I have used the ways of measurement and questionnaires to support my study. According to the analysis, the measured noise level was higher than the expected noise level. The equivalent noise level was proven to be higher when the windows of the classrooms were open. The noise level was also higher on the third floor than the first floor. The correlation between the measured noise level and the perceived level of noise was tested in each school. The school which had a higher expected noise level showed a high perceived level of noise. The measured noise level and the perceived level of noise became larger on the higher floors. Through the questionnaires, the traffic noises were proven to be the largest noise-making source surrounding the schools. Most of the students replied on the questionnaires that they have been consistently bothered by the noise. It interfered with their studies and concentration. Also, the sound of their voices became louder because of the noise around their schools. Therefore, I have come to the conclusion that the traffic noises that surround the schools give the students negative influences.
Nylon 6 fiber media를 이용한 Biofilter의 VOCs(Toluene)의 제거
김장호,최동훈,김종수,김형호,장봉수 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1
This study was investigated the application and kinetics of biofiltration using cometabolic process to remediate gaseous toluene that are highly recalcitrant to adsoption and biodegradation. Biofiltration was successfully applied to treat amixture of volatile organic compounds(Toluene) from contaminated air stream. Immobilized Ps.oleovorans biofilter was evaluated for its value in simultaneous removal of Toluene from waste air stream. In the loading rate (1,000ppm) and space velocity(1,200hr). the average removal efficiencies of Toluene were 33.7%. and CO2 production rate were 5.28㎎/hr