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천장관절 나사 고정술을 위한 컴퓨터 지원 수술 장치의 개발
염진섭,최원식,김하용,김환정,강종원,김영호,김형민,서동현,이석,이제범,김남국,김철영 대한골절학회 2003 대한골절학회지 Vol.16 No.1
목 적 : 천장관철의 경피적 나사 고정술을 위한 컴퓨터 지원 수술 장치를 개발하여, 그 정확도를 측정하여 보고자 하였다. 대상 및 방법 : 광학 추적 장치(Polaris, Northern Digital, Canada)와 개인용 컴퓨터를 이용한 항법 장치를 개발하였다. 정확도 측정용 팬텀을 제작하여 복합 정합시의 정합 오차와 표적 지시 오차를 각각 30회씩 측정하였으며, 4개의 플라스틱 골반골 모델(Sawbone, USA)에 16개의 6.5 ㎜유관 나사를 삽입하여 정확히 삽입되었는지 여부를 호가인하였다. 결 과 : 정합 오차는 0.76±0.33㎜, 표적 지시 오차는 1.43±0.42㎜였다. 골반골 모델에 삽입한 16개의 나사는 모두 천장관절내에 삽입되었고, 피질골을 뚫고 나오거나 인접한 두 개의 나사나 와셔가 서로 충돌한 경우는 없었다. 결 론 : 개발된 컴퓨터 지원 수술 장치는 해외에서 개발된 장치와 유사한 정확도를 가지고 있었고, 골반골 모델을 이용한 모의 수술에서도 만족할 만한 결과를 얻었다. Purpose : The purpose of this study were to develop a computer-assisted surgery system for percutaneous screw fixation of the sacro-iliac joint and to evaluate its accuracy. Materials and Methods : We have developed a navigation system composed of an optical tracking device(Polaris, Northern Digital, Canada) and a personal computer. The registration error and target localization error at hybrid registration were measured using a phantom. The errors were measured 30 times for each. Sixteen 6.5㎜ cannulated screws were inserted into four plastic bone models (Sawbones, USA), and the accuracy was evaluated. Results : The registration error was 0.76±0.33 ㎜, and the target localization error was 1.43±0.42 ㎜. All of the 16 screws were inserted well across the sacro-iliac joint, and there was neither penetration of the cortical bones nor collision between screws or washers. Conclusion : The accuracy of the developed system was similar to existing ones, and its usefulness and helpfulness was proven with screw insertion into plastic bone models.
한국 초,중,고등학생 알레르기비염의 전국 유병률과 위험 인자에 대한 분석
김영호 ( Yeongho Kim ),서주희 ( Ju Hee Seo ),권지원 ( Ji Won Kwon ),이은 ( Eun Lee ),양송이 ( Song I Yang ),조현주 ( Hyun Ju Cho ),하미나 ( Mina Ha ),범은애 ( Eunae Burm ),이기재 ( Kee Jae Lee ),김환철 ( Hwan Cheol Kim ),임신예 ( Si 대한천식알레르기학회 2015 Allergy Asthma & Respiratory Disease Vol.3 No.4
Purpose: We investigated the prevalence and risk factors of allergic rhinitis (AR), nationwide in random children and adolescents of Korea. Methods: A modified International Study of Asthma and Allergies in Childhood (ISAAC) questionnaire survey was done in 1,820 children from elementary, middle, and high school nationwide in Korea. The subjects were selected by the stratifying sampling method by school grade and five regions. Current AR was defined as having AR symptoms during the last 12 months with a history of physician-diagnosed AR. Skin prick tests for 18 common allergens were performed. Results: The number of males was 945, and that of females was 875. The mean age of the patients was 12.61±3.40 years. The prevalence of current AR and atopic current AR were 29.0% and 18.7%, respectively. Risk factors for current AR were male (adjusted odds ratio [aOR], 1.486; 95% confidence interval [CI], 1.189.1.856), family history of paternal AR (aOR, 3.208; 95% CI, 2.460.4.182), family history of maternal AR (aOR, 3.138; 95% CI, 2.446.4.025), antibiotic use in infancy (aOR, 1.547; 95% CI, 1.228.1.949), mold exposure during infancy (aOR, 1.416; 95% CI, 1.103.1.819), mold exposure during the last 12 months (aOR, 1.285; 95% CI, 1.012.1.630), and sensitization on skin prick tests (aOR, 2.596; 95% CI, 2.055.3.279). Risk factors for atopic current AR were the same as those of current AR, whereas breast-milk feeding (aOR, 0.720; 95% CI, 0.530.0.976) was a protective factor. Sensitized allergens as risk factors for current AR were Dermatophagoides pteronyssinus, Dermatophagoides farina, ragweed, mugwort, oak, alder, birch, Japanese hop, cat, and dog. Conclusion: The prevalences of current AR and atopic current AR were 29.0% and 18.7%, respectively. Male, sex parental AR, antibiotic use in infancy, mold exposure during the last 12 months, mold exposure during infancy, and atopic sensitization were risk factors for current AR. Breast-milk feeding was a protective factor for atopic current AR. Aeroallergen sensitization was an important risk factor for AR. (Allergy Asthma Respir Dis 2015;3:272-280)
복합운동과 영양교육이 초등학교 11~12세 아동의 건강체력, 혈압 및 혈중 콜레스테롤에 미치는 영향
하민성(Ha, MinSeong),백영호(Baek, YeongHo) 학습자중심교과교육학회 2016 학습자중심교과교육연구 Vol.16 No.6
본 연구의 목적은 복합운동과 영양교육이 비만도별로 분류한 11~12세 남자초등학생의 건강체력, 혈압 및 혈중 콜레스테롤에 미치는 영향을 구명하는 것이었다. 남자 초등학생 187명을 대상으로 정상체중군 61명, 저체중군 56명, 비만군 70명으로 분류 하였다. 복합운동프로그램은 16주간, 주 3회, 1회 60분 동안 실시하였으며, 영양교육은 복합운동프로그램 전 30분 동안 실시하였고, 방과 후 활동시간을 활용하여 진행 하였다. 본 연구를 통하여 다음과 같은 결론을 얻었다. 신체조성 중, 체중, BMI, 근육량에서 유의한 변화가 나타났으며, 집단 내 변화 결과, 신장, 체중, BMI 및 근육량 모두 유의한 차이를 나타내었다. 체력은 근지구력에서 비만군의 변화가 가장 높게 나타났고, 집단 내 변화에는 근력에서 세 집단 모두 유의한 차이를 보였으며, 근지구력과 유연성은 비만군, 심폐지구력에서는 저체중군 및 비만군에서 유의한 차이를 나타내었다. 혈중 콜레스테롤에서는 비만군이 고밀도 지단백 콜레스테롤 및 저밀도 지 단백 콜레스테롤에서 유의한 차이를 나타내었다. 본 연구결과 복합운동과 영양교육은 학령기 아동의 기본생활습관의 변화와 건강관리를 위한 필수적인 프로그램이라 사료된다. The purpose of this study was to investigate the effects of combined exerciese and and nutritional education program on health related fitness, blood pressure and blood cholesterol in 11~12 elementary school male students. 187 school male students were randomly assigned in normal weight group (A, n=61), low birth weight group (B, n=56) and obesity group (C, n=70). The combined exercise was performed for 60 minutes 3 times for 12 weeks and nutritional education has been conducted 3 times for week. The test data were analyzed by paired t-test and one-way analysis of variance (ANOVA), and the alpha level of p <.05 was set for all tests of significance. The finding of this study were as follows: Body composition, Weight and BMI of obesity group were a significant difference in the rate of change. And the amount of (weight and BMI), (muscle mass) of (low birth weight group and obesity group), (all groups) in post-test significantly different as compared to that in pre-test. Physical fitness, muscle endurance of obesity group was a significant difference in the rate of change. And the amount of (muscle endurance and flexibility), (cardiovascular endurance) of (obesity group), (low birth weight group and obesity group) in post-test significantly different as compared to that in pre-test. And the amount of blood cholesterol of obesity group in post-test significantly different as compared to that in pre-test. Therefore, regular and continuous combined exercise and nutritional program were effective in improving the life style, health care for elementary school student.
Park Gyoung Du,Ha Jae Du,Kang Tae In,Kim Jong Su,Kim Yeongho,Lee Sang Jun,Han Im Sik 한국물리학회 2023 Current Applied Physics Vol.50 No.-
The p-n junction electric field (Fpn) of InAs quantum dot solar cell (QDSC) structure was investigated using photoluminescence and photoreflectance spectroscopy. Quantum dot (QD) was fabricated by the Stranski- Krastanov (S–K) and sub-monolayer (SML) methods. From photoreflectance results, the higher Fpn of SML than S–K QDSC from 20 K to 160 K presents that the background carrier concentration of SML QDSC decreases, due to the reduced defect density. Moreover, the SML QDSC shows lower Fpn than S–K QDSC due to the strengthened field screening effect from 160 K to 300 K. This is caused by the improved carrier thermally escaping from the SML QDs and the decreased photo-generated carrier trapping because of the reduced density of defects. The low strain-related defect density improves the efficiency of QDSC. Therefore, the Fpn obtained through the FKO signal from the photoreflectance spectrum could be a reliable method for analyzing the QDSC efficiency.