식품의 치아우식유발지수측정법 개발에 관한 연구

신승철,마득상,박덕영 단국대학교 치과대학 예방치과 1998 예방치과 세미나집 Vol.- No.12

The purpose of this study was to evaluate the reliability of the method for assessing cariogenicity of foodstuffs using pH drop by S. mutans, S. mutans was cultured with 8 ml of Tood-Hewitt broth for 7 hours. Then, this broth was centrifuged and 7 ml of supematant was removed and 1 ml of bacterial pellet was remained. Each 1 ml of 0.1%, 0.5% and 0.1% sucrose solution as the experimental groups and distilled water as a control group were mixed with these remained bacterial pellet and cultured at 37℃. The pH was measured at each 10 minutes for 2 hours. The caries potential index(CPI) was measured by calculating the width of area below pH 5.7 line. The reliability of the method was evaluated by comparing coefficients of variation of CPI. As the results, with concentration of sucrose solution between 0.1% to 1.0%, the method assessing CPI using S. mutans discriminated each CPI of solutions fairly well and was reliable.

고로슬래그미분말 대체율에 따른 고품질 콘크리트의 공학적 특성에 관한 실험적 연구

나철성,윤종기,장종호,김재환,유득현,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

As a part of efforts for conformity of demand in regard to high quality of concrete, blast-furnace slag has been utilized by means of cement replacement. Superior performance can be ensured, environmental pollution can be prevented and economical advantage can be obtained with utilization by cement placement. But the study on the blast-furnace slag is not systematic and reasonable. So, it is planed that basic data in regard to technique of manufacturing and economic improvement of high quality concrete is showed with experimental comparison and investigation of engineering properties of high quality concrete utilized by cement placement of blast-furnace as industry by-product in this study.

침엽수 구조용 정각재의 천연건조곡선과 함수율분포

정희석,이철현,강욱,엄창득 한국목재공학회 2003 목재공학 Vol.31 No.1

이 논문은 소나무와 일본잎갈나무의 변장 14.0cm와 16.5cm인 큰 정각재의 천연건조과정과 함수율분포에 관한 내용으로서 건조속도는 건조개시 첫 8주 동안 비교적 컸었으나 그 이후부터 점차 감소하였다. 생재에서 규격함수율 18% 수준까지 건조시간은 소나무 14.0cm와 16.5cm가 각각 26주와 32주이고, 일본잎갈나무의 경우는 각각 32주와 48주이었다. 이들 정각재의 재장방향과 두께방향의 수분경사는 비교적 완만하였다. 일본잎갈나무의 수분경사는 소나무의 것보다 컸었고, 일본잎갈나무의 변장의 크기가 수분경사에 미치는 영향은 소나무의 것보다 컸었다. This paper presents the results of air-drying processes and mositure content (MC) distribution of red pine (P. densiflora) and Japanese larch (I. leptolepis) square timber with 14 cm and 16.5 cm of face size, respectively. The air-drying rates of square timber were comparatively high during the first 8 weeks, after that gradually decreased. The time to air dry square timber from initial MC to specified MC of 18 percent required about 26 weeks for 14.0 cm and 32 weeks for 16.5 cm square of red pine, and 32 weeks for 14.0 cm and 48 weeks for 16.5 cm square of Japanese larch. The longitudinal-and transverse MC distribution of these air-dried squares showed slight moisture gradient. The effect of face size on moisture gradient of Japanese larch square was more pronounced comparing with red pine one.

댐 건설전후 유역의 장기유출특성변화의 분석 : I.GIS를 이용한 NWS-PC 모형의 매개변수 추정

윤용남,유철상,안재현,양인태,고덕구 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-

본 연구에는 CIS를 이용하여 장기유출 해석 모형의 하나인 NWS-PC모형의 매개변수를 얼마나 적절히 추정할 수 있는가에 대해 알아보았다. 수치표고모형, 수치토양도 및 인공위성영상을 분석하여 얻은 토지이용도 등을 기본 자료로 이용하였고 소유역별 특성값을 GIS를 이용하여 추출하였다. 이러한 특성치들은 Amstrong(1978)에 의거하여 소유역별 모형의 매개변수를 추정하는데 직접이용된다. NWS-PC 모형의 경우 추정된 매개변수는 가능한 값의 범위로 주 This study is to see how effectively the NWS-PC model parameters can be estimated using GIS. Basic informations such as DEM(Digital Elevation Model) ,digital soil map, land use information from satellite image are provided and analyzed for estimating the sub-basin characteristics in GIS. These charcateristics are used to estimate the model parameters for each sub-basin. The model parameters estimated based on Amstrong(1978) are given as a possible range, which will be fixed through the calibration procedure. In this study, we used the1974 data for calibration and the 1979 event for verification. From the calibration procedure, we could find that the parameters related with infiltration and water tend to have the minimum value of the range and that the parameters related with exfiltration of water tend to have the maximum value of the range This result seem to reflect the hydrologic characteristics of Keum-river basin, which could be used to fix the model parameter without difficult calibration procedure. The simulation results show that the relative error of calculated discharge to observed discharge to be within approximately 10% . Therefore, the model with the parameters calibrated was considered to be adaptable for long-term runoff analysisf or Keum-river basin.

고밀도 유도결합 플라즈마 시뮬레이터의 GUI 및 Post Processor 개발

남경진, 김용일, 권득철, 윤남식 충북대학교 컴퓨터정보통신연구소 2007 컴퓨터정보통신연구 Vol.15 No.2

-본문참고-

VTK를 이용한 시각화 프로그램의 개발

이원기, 김용일, 권득철, 윤남식 충북대학교 컴퓨터정보통신연구소 2008 컴퓨터정보통신연구 Vol.16 No.1

-본문참고-

DC방전에 대한 전류 및 전압 조건에서 1차원 전산모사

김희정,김형용,권득철,윤남식 충북대학교 컴퓨터정보통신 연구소 2006 컴퓨터정보통신연구 Vol.14 No.1

여러 그룹들의 연구 결과로서 DC 방전 전산모사를 위한 여러 가지 수치해석적 방법들이 보고되어 왔다. 대부분의 방법들은 전극에 전압을 경계 조건으로 가정하고 전류를 구하는 방법인데, 때로는 전류값을 조건으로 주고 전극의 전압이 결정되는 방법이 필요한 경우도 있다. 본 연구에서는 전류값이 조건으로 주어진 경우에 전극의 전압이 결정되는 방법을 적용했으며, 1차원 전산모사를 통해 두 가지 방법에 의한 결과를 비교하였다. Various numerical simulation algorithms for simulating DC discharge were reported from many research groups. Most of reported methods uses terminal electrode voltage as a boundary condition to obtain current density. However, in some case, we need to obtain terminal voltage from boundary condition of current. In this paper, the method which obtain voltage under current condition is applied, and we compared the results of two methods through one-dimensional simulations.

일부 운수사업장 근로자의 건강진단 유소견자의 사후관리 실행과 관련요인

윤혜은,박종,이영선,강성득,김철호 조선대학교 2003 The Medical Journal of Chosun University Vol.28 No.1

Objective : The purpose of this study was to find the relationship between the follow-up management status for medical problem to be treated and various characteristics of some workers at transportation business. Methods : A questionnaire survey was made toward 183 workers with medical problem(C and D2) among 945 examine in 1997. Results: Sixty four point five percent of surveyee received the examination result report and 40.5% were explained about the result 80.3% of surveyee answered that they knew the result of health examination. Most workers felt the necessity of the health examination, but 54.1% were dissatisfied with present health examination system and 66.7% pointed it out as nominal The rate of follow-up management for the medical problem was 62.8% By the multiple logistic regression the follow-up management rate for those who knew the health examination result were 2.98 times higher than those who didn't know the result (OR=2.98, 95% CI 1.41~6.29) The rate for those who perceived the medical problem already were 2.64 times higher than those who perceived the problem for the first time (OR=2.64, 95% CI 1.13~6.15). The rate for those who had subjective symptoms were 2.83 times higher than those who didn't have subjective symptoms. Conclusion : sixty two point eight percent of workers with medical problem performed the follow-up management and perception of health examination result, perception of the problem in the past and experience of subjective symptoms were related with the follow-up management.

팔라듐 담지 촉매에 의한 메탄의 연소반응

박남국,신재순,김덕중,최영현,김영철 全南大學校 觸媒硏究所 1997 觸媒硏究 論文集 Vol.19 No.-

Catalytic oxidation of methane was studied in a fixed bed flow reactor. Supported Pd and La promoted Pd catalysts were prepared by incipient wetness impregnation method. Up to 0.5wt.% of Pd, the catalytic activity was increased with Pd loading. However, the activity did not change above that loading. 0.1wt.% La added Pd catalysts showed increased catalytic activities due to increased methane and oxygen adsorption. La addition proved to increase the dispersion, thus increases thermal stability of the catalysts. However, when the loading of La exceeds 1.0wt.%. methane oxidation activity was decreased. presumably due to the pore and Pd blocking by added La.

간호사의 근골격계질환 증상유병정도 및 관련요인

박종,강명근,이영선,강성득,김철호 朝鮮大學校 附設 醫學硏究所 2003 The Medical Journal of Chosun University Vol.28 No.2

Objectives : The purpose of this study were to identify musculoskeletal symptom among nurses in a hospital and to explore its related factors . Methods : A self-administered questionnaire survey including work condition and presence of musculoskeletal symptom was made toward 190 nurses at a university hospital. Results : The prevalence of musculoskeletal symptom was calculated as 20.4% at neck, 27.7% at shoulder, 15.7% at arm or hand and 29.3% at leg. By multiple logistic regression, the prevalence of musculoskeletal symptom was 3.57 times (95% CI : 1.53 - 8.35) higher among persons with general illness symptom than persons without symptom, 2.99 times (95% CI : 1.22-7.36) higher among persons with psycho-rieuro subjective symptom than without symptom, 3.48 times (95% CI : 1.46 - 8.27) higher among irregular menstruation period than regular period. The subjective symptom prevalence at the shoulder was 2.24 times (95% CI : 1.06 - 4.71) among persons with past history of certain chronic diseases than without the history. The prevalence at the upper arm was 4.60 times (95 % CI : 1.24 - 17.08) higher among persons drinking two cups of coffee a day and 9. 92 times (95 % CI : 2.28 - 34.91) higher than persons who drank a cup of coffee a day or less. The prevalence of backache was 3.18 times (95 % CI : 1.10 - 11.01) higher among 30-34 year old group than group less than 25 years old persons. The prevalence of subjective symptom at leg showed 3.93 times (95% CI : 1.44 - 10.71) higher among persons with irregular menstruation period than regular period. Conclusion : Many nurses under study had musculoskeletal symptom and the symptom was related with complicated combination of general characteristics, subjective symptom at other site, occupational characteristics and characteristics related with diseases, by various site of the system. Therefore appropriate intervention programs are needed ot be developed to prevent musculoskeletal illness among nurses.