관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

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.

동양 전통과학의 탐구방법론 연구 : 朱子의 格物致知論을 중심으로

최영제,이우붕,정원우,김용수,문장수,방경곤,김기정 경북대학교사범대학과학교육연구소 2005 科學敎育硏究誌 Vol.29 No.-

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.

택시운전기사의 요통에 관한 조사

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.

축산폐수 슬러지의 단백질 이용

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.

모 제약회사 근로자들의 직업성 천식 유병률과 약제 분말 노출수준

오성수,최용휴,김은아,이영목,장재길,유장진,박승현,김태균,정수영,김규상,강성규 大韓産業醫學會 2006 대한직업환경의학회지 Vol.18 No.2

목적: 제약회사에서 직업상 천식의 유병 규모를 파악하고 작업공정에 대한 작업환경 측정을 통해 제약회사의 약제 분말에 대한 노출수준을 평가하고자 하였다. 방법: 제약회사에서 약제 분말에 노출되는 근로자를 대상으로 천식을 선별하기 위하여 설문조사 및 진찰, 혈액검사, 폐기능 검사 그리고 피부단자시험을 실시하였고, 각 부서별 공정에 따라서 총분진과 항생제 또는 효소제 분말에 대한 작업환경 측정을 실시하였다. 직업상 천식이 의심되는 근로자에 대하여 기관지과민성에 대한 검사(메타콜린을 이용한 비특이 기관지유발시험)와 약제 분말 기관지유발시험을 실시하여 확진하였다. 결과: 설문조사 및 진찰에서 작업 관련 천식 증상이 있는 근로자는 11명(34.4%)이었고, 약제 분말을 이용한 피부단자시험에서 1+ 이상 반응을 보인 근로자 10명(31.2%)이었다. 비특이 기관지유발시험 결과 8명(25.0%)이 양성(PC20 ≤16 mg/ml)이었다. 약제 분말 기관지유발시험을 통해 직업상 천식으로 확진된 근로자는 5명(15.6%)이었다. 작업환경 측정에서 원료를 충진하거나 투입하는 작업 그리고 정립작업에서 약제 분말에 대한 노출이 많았다. 결론: 제약회사에서 직업상 천식은 주로 제조공정 중 약제 분말에 노출된 근로자에서 발생하여, 증상 및 직업성 천식의 유병률이 높았다. 따라서 원료를 충진 또는 투입하는 작업과 정립작업 등 제조과적에서 약제 분말 노출을 줄이기 위한 세심한 주의가 필요하여, 약제 분말을 취급하는 근로자에 대해서는 천식 증상 조사뿐 아니라 정기적으로 피부단자시험, 비특이 기관지유발시험 등을 실시하여야 할 것이다. Objectives: After the investigation of one worker with occupational asthma, we surveyed the preva- lence of occupational asthma and the exposure level of pharmaceutical dust of 32 workers in a pharmaceutical company. Methods: Thirty-two of the 90 employees participated in the survey which consisted of questionnaire, blood sampling, spirometry and skin prick tests with 8 common allergens as well as 9 antibiotics and 2 enzymes. Various indices of the working environment were also measured. Subjects who had a symptom suggestive of work-related asthma or positive skin prick test were further investigated by PC20 methacholine. Nine subjects who had a PC20 result of 16 mg/ml or less (n=7) or had work-related symptoms and positive skin prick test (n=2) were referred to undergo a specific bronchial provocation test to phar- maceutical dust in an academic allergic disease center. Results: Eleven of 32 workers (34.4%) had a work-related symptom suggestive of occupational asthma. Ten (31.2%) showed positive skin prick test. 8 (25.0%) had a PC20 result of 16 mg/ml or less (indicative of significant bronchial hyperresponsiveness), and 5 (15.6%) had a positive result on the specific bronchial provocation test. Exposure levels of stuffing, input of raw materials and screening process were relatively high. Conclusions: This survey showed that pharmaceutical workers have an increased risk of occupational asthma. Although pharmaceutical factories maintain a relatively good working environment, careful control of respiratory tract exposures, especially during stuffing, input or raw materials and screening process, is important to prevent occupational asthma. Pharmaceutical workers need to undergo regular skin prick and methacholine bronchial provocation tests, as well as asthmatic symptom survey, to ensure the early detection and prevention of occupational asthma.

백운모광의 품위향상에 관한 연구

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.

승모판 혈류의 E파와 폐정맥혈류의 D파의 최대속도 간의 시간 간격과 승모판 도플러 지수들과의 관계

전두수,이만영,박지원,김용주,임효영,강동헌,이길환,김종진,채장성,김재형,홍순조,최규보 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.9

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