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Ti-(45-X)Ni-5Cu-X(Mo,Cr,Al)(at.%) 합금의 B2-B19-B19` 변태거동 및 형상기억특성
李喜佑,崔美善,金載勳,南泰鉉 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.6
Transformation behavior and shape memory characteristics in Ti-(45-X)Ni-5Cu-X(Mo, Cr, Al)(at.%) alloys were investigated by means of differential scanning calorimetry, X-ray diffraction and thermal cycling tests under a constant load. The substitution of Mo, Cr and Al for Ni in Ti-45Ni-5Cu alloy induced the B2→B19 martensitic transformation prior to the B2→B19' transformation, and consequently Ti-(45-X)Ni-5Cu-X(Mo, Cr, Al)(at.%) alloys transformed in two stages; the B2→B19→B19'. The B2→B19 and the B19→B19' transformations were completely separated in Ti-(45-X)Ni-5Cu-X(Mo, Cr) alloys, whereas they were not done in a Ti-44.3Ni-5Cu-0.7A1 alloy without applied stress. The substitution of Mo, Cr and Al in a Ti-45Ni-5Cu alloy decreased transformation hysteresis and the residual elongation. The maximum recoverable elongation of Ti-(45-X)Ni-5Cu-X(Mo, Cr, Al) alloys was about 5%.
이희우 대한영상의학회 1976 대한영상의학회지 Vol.12 No.2
The purpose of this paper is to evaluate and analize the radiological findings and operative results of lumbar disc syndrome at Han-gang Sung-sim Hospital during the period from March 1973 to July 1976. The results are as follows: 1. The age distribution of the patients varied from 18 to 65 years old. The average of the age was 35 years old. Fourty six patients were male(62.2%) and twenty eight patients were female. 2. The size of the lower lumbar spinal canal was slightly decreased as compared with that of the normal control group and the intervertebral disc space was also decreased. It is considered that the initial and fundamental cause of lumbar disc syndrome is degenerative change of intervertebral disc and also posterior articulation facet. 3. Decreased lumbar lordosis in comparison with that on the normal control group is considered to be due to degenerative change of vertebrae and increased lumbar muscular rigidity. 4. In this series of 74 patients considered to be hav severe lumbar disc syndrome, 43 had simple herniation of nucleus pulposus, 12 had lumbar spondylosis and 2 had spinal stenosis. The remainder had combination of two or more of these three conditions, as determined by pantopaque myelography in all cases and substantiated by operative findings in the majority.
이희우,신선미,김주자,강세원 한국학교보건학회 2008 韓國學校保健學會誌 Vol.21 No.2
Purpose: To investigate the utilization of medical care benefits of school personnel on duty in Seoul Method: The subjects were 551 workers under Seoul Metropolitan Office of Education(male 301, female 250) who got medical care benefits from March 2000 to February 2005. To analyze the data. frequency chi-square test and t-test by SAS package 9.12 were used Result: The results show that elementary school personnel got the highest ranking, 314(57.0%) Among subjects 57.2% personnel got accident when they were working on their own duty, 21% during school events and 13.5% were during commutes They got medical care from orthopedics 75.9% neurosurgery 7.6% dental 4% and 8 male and 2 female died during these days The most frequent diseases of males and female were fracture and joints related disease The reason of most health problem was due to injury(92.3%) Conclusion: The results of this study suggest that the continuous health care services like regular health check for school personnel, or social safety network to prevent injury are needed.
데이터 마이닝을 이용한 서울시 교직원의 피로요인 탐색연구
이희우,신선미 한국학교보건학회 2006 韓國學校保健學會誌 Vol.19 No.2
Purpose : To identify general characteristics of school personnel with recent fatigue which was the most frequent symptom among subjective symptoms and to explore fatigue-related factors by evaluating physical and perceived health status, life style, and symptoms through data mining techniques. Methods : We collected a data of the 1,147(male 545, female 602) who were elementary, middle, or high school personnel, answered a questionnaire, and received physical examination in Seoul School Health Center from September to November in 2000. And we investigated the differences between fatigue group and non-fatigue group for demographic characteristics, physical health status, perceived health status, symptoms, and laboratory values by frequency, chi-square test, t-test, or simple logistic regression analysis by SAS package 8.1, and then selected significant variables as input variables of a decision tree analysis of CART model by SAS E-miner. Results : In general characteristics, the fatigue consisted of 41.1%(male 35.2%, female 46.4%) among 1,147 school personnel. In classical statistics, factors related with fatigue were female, lower means of systolic and diastolic pressure, young age, personnel in middle school, irregular eating habit, no exercise a week or less than 30minutes exercise a day, perception of unhealthy status, and subjective symptoms including short of breath at exercise. In simple logistic regression to examine the relationship between selected independent variables and fatigue as a dependent variable, the odds ratio of gender (female vs male) was 1.58 times, and young age ( 20s vs 60s) 20.67 times, and middle vs high school personnel 1.86 times. However, we mined combined several characteristics by SAS-E miner. In CART model, if health perception was healthy, and age was >= 37.5 years, the proportion of the fatigue was only 19.3%. but if health perception was not healthy and symptom was severe 'short of breath' during exercise and age was < 53.5 years, and BMI was >= 22.69, the proportion of the fatigue was up to 84.8%. Conclusions : The fatigue consisted of 41.1%(male 35.2%, female 46.4%). In classical statistics, fatigue-related factors among school personnel were young age, female gender, perceived unhealthy status, subjective physical symptoms, poor life-style, and lower blood pressure rather than only physical health status. However, in data mining, if health perception was healthy and age was >= 37.5 years, the proportion of the fatigue was only 19.3%. but if health perception was not healthy and symptom was severe 'short of breath' during exercise and age was < 53.5 years, and BMI was >= 22.69, the proportion of the fatigue was up to 84.8%.