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전산화단층촬영에 있어서 X-선 흡수계수의 신뢰도에 관한 실험적 연구
이희우,김건상,박수성 중앙대학교 의과대학 의과학연구소 1985 中央醫大誌 Vol.10 No.4
For evaluation of reliability of CT numbers, one ovoid and three round phantoms, which were filled with pure water and different in their diameters, were scanned under various conditions with five whole body and four head CT scanners. The results were as follows: 1. The ovoid phantom similar to human body in size and shape scanned with whole body scanners revealed stable and relatively correct CT numbers throughout entire of phantom. 2. CT numbers were generally higher in phantoms of round and smaller types. 3. There was definite tendency to show higher CT numbers at peripheral zone of phantoms. 4. With increase of kVp, CT numbers were decreased. 5. By the change in mA and slice thickness, some CT scanners were influenced, but the others were not. 6. CT numbers were not influenced by scan time. 7. CT numbers were not influenced by position of phantom in the aperture of gantry of CT scanner. 8. The bone density had no influence upon CT numbers at the region distant more than 1㎝. In two CT scanners, CT numbers were significantly increased within 1㎝ to bone density higher than 455 Hounsfield Unit. 9. CT scanners from different manufacturers showed different results, but those of same model from same manufacturer revealed similar results.
이희우,Lee, Hui-U 한국방위산업진흥회 2000 國防과 技術 Vol.- No.255
T-50은 제 3세대 훈련기의 특징을 최대한 살려서 Total Traing System으로서의 가치를 높여야 한다. 즉, 항공기 뿐만 아니라 비행시뮬레이터를 비롯한 각종 지상비행훈련장비와 정비훈련장비 등으로 Total Traing System으로서의 시너지 효과를 높이는데 주력해야 할 것이다. 또한 KT-1과 조화롭게 연계된 비행훈련체계를 구축함으로써 세계 훈련기시장에서 제 3세대 훈련기의 선두주자로서의 인식과 함께 마케팅에도 상호보완효과를 유도해 낼 수 있을 것으로 예상된다. 이제 세계 훈련기 시장의 종주국으로 거듭나고 있는 한국의 항공산업은 때마침 구조조정에 의해 새로 탄생된 한국항공우주산업(주)의 출범과 맞물려 세계 항공업계의 주목을 받기 시작했다.
이희우,Lee, Hui-U 한국방위산업진흥회 1992 國防과 技術 Vol.- No.159
시험평가는 완성된 무기체계에 대한 시험평가에 그치지 않고 개발초기부터 개입하여, 작전배치후 상당기간 운영단계까지 지속되므로 무기체계 연구개발의 각 단계와 밀접한 관련을 갖고 있다. 필자는 시험평가기술을 갖추고자 하는 국내요구의 일환으로 최근 미 공군의 운용시험평가사령부에서 연수를 받았으며, 실제 시험평가를 수행하는 예하부대를 방문하여 각종 무기체계 시험평가팀과 면담을한 바도 있어 이를 바탕으로 미 공군의 시험평가 조직 및 세부기능에 대한 소개를 하고자 한다
이희우,Lee, Hui-U 한국방위산업진흥회 1994 國防과 技術 Vol.- No.182
군소요를 근간으로 발전해온 국내 항공산업은 계열화 미흡, 업체간의 과당경쟁 및 중복투자, 경험미비에서 오는 개발지연, 각 프로젝트간의 기술 연계성 미흡, 전문인력 부족 등의 많은 현안 문제점들이 내재되어 있어 이미 개발진행중인 사업들의 재정비를 통한 내실화가 가장 시급한 실정이다.
서울시 교직원 당뇨병의 역학적 특성 및 관련위험요인분석
이희우,김종희,장철환,신선미 韓國學校保健學會 2004 韓國學校保健學會誌 Vol.17 No.1
Purpose : To describe the prevalence, epidemiological characteristics, and related factors of diabetes mellitus in school personnel. Method : 5,384 school personnel (2,638 males 2,746 females) received physical examinations at the Seoul School Health Center in Z 2. Using the American Diabetes Association criteria, and fasting blood sugar(FBS) was classified as normal at 110>=FBS, borderline 111-125, and the diabetes group 126<=FBS. Related factors of each group were evaluated by gender. Results : In the diabetes group, there were 4.74% males and 0.8% females, and the borderline group was 6.37% males and 2.22% females. The older age group gad a higher distribution in both males and females in the diabetes group. In the diabetes group, the mean and abnormal rate of BMI, systolic hypertension, diastolic hypertension, total cholesterol, GOT, GPT, and GTP were higher than in the normal group. In life style factor, the diabetes group gad a higher distribution of meat eating and smoking more than 20 years than the normal group. The effect of FBS on BMI, BP(blood pressure), total cholesterol, GOT, GPT, and GTP were investigated after controlling for confounding variables. In the borderline and diabetes group, the mean of BMI, BP, total cholesterol, GOT, GFT, and GTP was higher in dose-response effect. In the logistic multiple regression, the related factors of the diabetes group were hypertension and abnormal GTP in males, and abnormal total cholesterol and GTP in females. In the borderline group, the related factors were meat eating, hypertension, and high GOT in males and the older age group, and hypertension, total cholesterol, and abnormal GTP in females. Conclusions : It is possible to manage all related factors of diabetes mellitus except for age. An appropriate program for health promotion is necessary.
이희우 서울대학교 어학연구소 1985 語學硏究 Vol.21 No.1
The present study discusses the name of the Udihe tribe, which is a branch of Tungus. I examined the various hypotheses of the historical origin of 'Udihe.' And I investigated the complex problems about the name of 'Udihe' on the basis of historical and ethnographical materials about the tribe. My attempt to treat the name 'Udige' and 'Weji' on the one hand and 'Udige' and 'Udihe' on th other under the same origin can be regarded as a contribution to the future study of the historical and ethnographical status of 'Udihe.'