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이용호,신용수,Lee, Yong-Ho,Sin, Yong-Su 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2
This paper presents a new passive gravity -compensating system for articulated robot manipulators. The system, which consists of linear zero- free -length springs, achieves exact counterbalancing o f the gravitational loads throughout the entire range of the manipulator workspace, A basic concept is to design springs such that the total potential energy of the system including the manipulator and the springs should be maintained constant. A prototype has been developed for a direct-drive five-bar manipulator and its performances have been investigated. Results show that the gravity-induced motor torques have been reduced to less than 5% of those of uncompensated robots. Also, the gravity-compensating system simplifies the position control algorithm while maintaining the trajectory-tracking errors in a satisfactory level. In conclusion, the proposed system efficiently improves the manipulator performances by reducing the driving motor size and the energy consumption as well as by simplifying the control systems.
이용호 嶺南大學校社會科學硏究所 2002 社會科學硏究 Vol.22 No.1
올해는 일본의 廣島와 長崎에 원자탄이 투하된 후 57년이 되는 해이다. 그간 국제사회는 오랜 세월 동안 핵군비경쟁을 벌이기도 하였고, 다른 한편에서는 그러한 핵무기를 통제하기 위한 다양한 노력도 경주하여 왔다. 그러나 아직까지 핵무기는 인류의 평화와 안전을 파괴하는 거대한 위협요인으로 자리잡고 있다. 따라서 핵무기의 효과적인 통제는 오늘날 인류의 가히 절대적 과제인 것이다. 본 논문에서는, 지난 廣島와 長崎의 재앙이 다시 일어나서는 안 된다라는 전제하에서, 지난 57년간의 핵무기 통제의 노력을 정리하고, 그것을 바탕으로 보다 효과적인 통제방안을 도출하고 있다. 따라서 비핵화지대에 관한 다양한 조약과 제안, 핵무기비확산조약, 핵기술 등의 다자간 수출통제체제인 쟁거위원회(Zangger Committee)와 핵공급국모임(Nuclear Suppliers Group) 등에 관한 다양한 분석을 통해, 현실적으로 가까운 장래에 효과적으로 핵무기의 확산을 방지하는 것이 용이하지 않다고 결론짓고 있다.
강화 지역주민의 과거 10년간 홍역이환율 및 예방접종율의 변화 -출생년도별 코호트 분석-
이용호,Lee, Yong-Ho 대한예방의학회 1981 Journal of Preventive Medicine and Public Health Vol.14 No.1
The objective of the study is to measure the changes in measles infection and measles vaccination rates for the past 10 years in a rural area, Kang Wha. The study population were the entire children who were born between 1971 and 1950 in three townships (Sunwon, Naegae, Buleun) in Kangwha County. Two interview surveys were carried out during the 10 years of period, one in 1977 and the other in 1981. The data were collected by Family Health Workers through interview with structured questionnaires. The diagnosis of measles was mainly based on histories, symptoms and sighs of the disease. If a mother had reported measles history of her child, a public physician reviewed and decided the final diagnosis of the reported case. A retrospective cohort observation was done in order to see the trends of measles infections and measles vaccinations. The major findings were as follows; 1. The 5 year prevalence rate of measles vaccinations was 51.3% between 1971 and 1975 and 71.9% between 1976 and 1980 respectively. The difference between two periods was statistically significant (P<0.05). The secular trend of measles vaccinations showed increasing tendency from 1971 to 1978 and since then kept maintained. 2. In the birth cohort analysis of measles vaccinations, the vaccination rates, in general, were higher in the later cohort groups than that of earlier cohort groups. 9. The 5-year experience rates for measles infections were 24.3% between 1971 and 1975 and 17.2% between 1976 and 1980 respectively. This difference was statistically significant(P<0.05). The secular trend of experience rates for measles infections showed decreasing tendency from 1971 to 1980 except an outbreak in 1976. 4. The birth cohort analysis of experience rates for measles infections showed that the rate was higher in the later cohort groups than that of the earlier cohort groups. This decreasing tendency was prominent between $1973{\sim}1974$ and $1976{\sim}1977$. 5. The distribution of age specific incidence rates for measles infections showed unimodal curve with the peak at the age of 12 to 18 months. This findings were same in both two surveys. 6. Seasonal variations of the measles infections showed two peaks, one major peak in March through May and the another minor peak in September through December. 7. The 5-year reduction rate for measles infections among those vaccinated was 90.4% between 1971 and 1975 and 88% between 1976 and 1980.