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타이타늄 임플랜트 시편 내부에 설치한 자석의 자성강도에 따른 골형성 변화
황윤태,이성복,최대균,최부병,Hwang Yun-Tae,Lee Sung-Bok,Choi Dae-Gyun,Choi Boo-Byung 대한치과보철학회 2005 대한치과보철학회지 Vol.43 No.2
Purpose. The purposes of this investigation were to discover the possibility of clinical application in the areas of dental implants and bone grafts by investigating the bone formation histologically around specimen which was depending on the intensity of magnetic field of neodymium magnet inside of the specimens. Material and method. 1. Measurement of magnetic intensity - placed the magnet inside of the specimen, and measured the intensity of magnetic field around the 1st thread and 3rd thread of specimen 20 times by using a Gaussmeter(Kanetec Co., Japan). 2. Surgical Procedure - Male rabbit was anesthetised by constant amount of Ketamine (0.25ml/kg) and Rompun (0.25ml/kg). After incising the flat part of tibia, and planted the specimens of titanium implant, control group was stitched without magnet, while experimental groups were placed a magnedisc 500(Aichi Steel Co., Japan) or magnedisc 800(Aichi Steel Co., Japan) into it, fixed by pattern resin and stitched. 3. Management after the surgery - In order to prevent it from the infection of bacteria and for antiinflammation, Gentamycin and Ketopro were injected during 1 week from operation day, and dressed with potadine. 4. Preparation of histomorphometric analysis - At 2, 4 and 8 weeks after the surgery, the animals were sacrificed by excessed Ketamine, and then, specimens were obtained including the operated part and some parts of tibia, and fixed it to 10% of PBS buffer solution. After embedding specimens in Technovit 1200 and B.P solution, made a H-E stain. Samples width was 75$\mu$m . In histological findings through the optical microscope and using Kappa image base program(Olympus Co. Japan), the bone contact ratio and bone area ratio of each parts of specimens were measured and analyzed. 5. Statistical analysis - Statistical analysis was accomplished with Mann Whitney U-test. Results and conclusion. 1. In histomorphometric findings, increased new bone formation was shown in both control & experimental groups through the experiment performed for 2, 4 & 8 weeks. After 4 weeks, more osteoblasts and osteoclasts with significant bone remodeling were shown in experimental groups. 2. In histomorphometric analysis, the bone contact ratios were 38.5% for experimental group 1, 29.5% for experimental group 2 and 11.9% for control group. Experimental groups were higher than control group(p<0.05) (Fig. 6, Table IV). The bone area ratios were 60.9% for experimental group 2, 46.4% for experimental group 1 and 36.0% for control group. There was no significantly statistical difference between experimental groups and control group(p<0.05) (Fig. 8, Table VII) 3. In comparision of the bone contact ratios at each measurement sites according to magnetic intensity, experimental group 2(5.6mT) was higher than control group at the 1st thread (p<0.05) and experimental group 1 (1.8mT) was higher than control group at the 3rd thread(p<0.05) (Fig. 7, Table V, VI). 4. In comparision of the bone area ratios at each measurement sites according to magnetic intensity, experimental group 2(5.6mT) was higher than control group and experimental group 1 (4.0mT) at the 1st thread(p<0.1) and experimental group 2(4.4mT) was higher than experimental group 1 (1.8mT) at the 3rd thread(p<0.1) (Fig. 9, Table IX, X). Experiment group 2 was largest, followed by experiment group l and control group at the 3rd thread of implant. There was a significant difference at the 1st thread of control group & experiment group 2, and at 1st thread & 3rd thread of experiment group 1 & 2, and not at control group experiment group 1.(p<0.1)
적외선 센서와 무선통신을 이용한 열차접근경보시스템 개발
황윤태(Yun-Tae Hwang),황성태(Sung-Tae Hwang),이윤성(Yun-Sung Lee),김도근(Do-Keun Kim),이태규(Tae-Gyu Lee) 한국콘텐츠학회 2017 한국콘텐츠학회논문지 Vol.17 No.11
국내의 철도작업자의 안전사고는 열차 운행 기관사의 부주의, 선로변 작업자의 감각차단 현상 및 신호수의 실수 등으로 인해 추돌사고가 주요 원인으로 매년 꾸준히 발생하고 있으며 이러한 안전사고를 예방할 수 있는 대책 마련이 시급하다. 따라서 철도 작업 시, 선로변 작업자가 청각과 시각적으로 열차접근을 검지하여 열차 접근으로부터 대피 할 수 있는 열차접근경보시스템을 개발하였다. 이 시스템은 철도 작업장에서 1.5km 이상 전후방 선로에 열차자동검지장치를 설치하여 자동으로 열차 진입을 검지하도록 하고 작업장에 설치된 실시간 경보장치에 유무선으로 검지 신호를 전달하도록 하며, 검지신호를 수신한 실시간 경보장치는 LED 경보등 및 사이렌 등으로 작업자에게 경보신호를 주는 방식으로 작동된다. 이전의 시스템에 비해 원거리에 있는 열차접근의 검지가 가능하고 주로 무선통신방식을 채택하여 통신배선작업이 불필요하며 충전식 배터리와 태양광 충전장치를 통해 외부 전원 공급이 어려운 현장의 상황에 적합한 이점이 있다. 시스템의 현장검증을 통하여 열차자동검지장치와 실시간 경보장치의 성능평가를 실시하였고 100%구동을 확인하여 신뢰성을 검증하였다. Safety accidents in railway work continue to increase every year; Engineer’s negligence, trackside worker’s sensory deprivation and signalman’s mistake are the main reasons of such incidents. We consider this problem by far the most urgent matter in railway work because of its steady increase and risk of taking a person’s life. Based on that account, a new alarm system has developed, that is called Railway Access Alarm System, to allow railway workers to sense the access of trains with not only vision, but also hearing. The detector device of this system is installed on both sides of the track locating 1.5km from the workplace. When the train enters the place, the detector device can sense the entering, sending the detect sign of train to the alarm unit, then the alarm unit warns the workers by the LED lighting and sirens. This system has several advantages compared to previous systems. First, it recognizes the train at a long distance. Secondly, there is no need for wiring work since it is a wireless system. At last, the system works by rechargeable batteries and solar charger so that it is installed in the work places where there is no external power supply. Moreover, it is proven that the system is 100% reliable by the successful on-the spot inspection evaluating the capability.
고용불안정과 가구소득 대비 개인 의료비 지출 비중의 연관성
정우영 ( Woo-young Jung ),한윤수 ( Yun-su Han ),김찬호 ( Chan-ho Kim ),황윤태 ( Yun-tae Hwang ),이예진 ( Yejin Lee ),노영민 ( Young-min Noh ),노진원 ( Jin-won Noh ) 한국병원경영학회 2019 병원경영학회지 Vol.24 No.2
Purpose: The purpose of this study is to identify relationship between work unstability and personal medical expenditure ratio focusing on wage workersʼ contract period. Method: This study analyzed 2015 yearly data beta version of Korea Health Panel, co-managed by Korea Institute for Health and Social Affairs and National Insurance Corporation for data analysis. When executing linear regression, Household income was applied with equivalized income, and the proportion of personal medical expenditure was naturally logged to perform linear regression and the demographic and socioeconomic factors were taken into account. The demographic and socio-economic factors were also considered. Findings: As a result of reviewing the used factors, it was found that the more unstable work status, the higher personal medical expenditure ratio. This result corresponds to ʻThe Theory of Fundamental Causesʼ by Link & Phelan. Conclusion : It indicates that policy efforts should be made to improve the working environment and health level of socially unstable workers.