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권대현,배장호,송필현,김현태,문기학 대한남성과학회 2010 The World Journal of Men's Health Vol.28 No.3
Purpose: In early 1980s, vasectomy was performed in more than 10 thousand men of reproductive age annually without cost as a South Korean government policy of birth control, but because the policy has been converted to encouraging childbirth since July 2004, vasovasostomy is now covered by national health insurance. We investigated the effect of national health insurance coverage of vasovasostomy. Materials and Methods: From August 1997 to June 2009, a total of 117 patients who underwent vasovasostomy were enrolled in this study. We divided the patients into two groups. The 63 patients undergoing the procedure before national health insurance coverage were included in group A, and the other 54 patients, who underwent the procedure after insurance coverage began, were classified into group B. The two groups were compared according to age, spouse's age, time since vasectomy, number of children at the time of vasectomy, occupation, educational attainment, religion, and the reason for vasovasostomy. Results: The average number of cases of vasovasostomy was almost 3 times higher after insurance coverage was introduced, at 2.3 cases per month. The average spouse's age was significantly higher in group B than group A (35.2±4.8 vs. 32.2±3.5, p=0.012). Time since vasectomy was shorter in group B than group A (5.7±4.7 years vs. 8.9±5.0 years, p=0.001). Number of children at the time of vasectomy showed no significant difference between group A and group B, at 1.7±0.7 and 1.6±0.8 respectively. Cross tabulation analysis of occupation, educational status, religion, and the reason for vasovasostomy showed no significant difference. The patency rate was significantly higher in group A than group B (87.3% vs. 90.7%, p=0.012), but there was no significant difference in pregnancy rate. Conclusions: A significant increase was seen in patency rate, but not in pregnancy rate, after insurance coverage. However, further follow up will show us that a rise in the patency rate promises positive effects on the rise of pregnancy rate. We suggest that insurance coverage for vasovasostomy has encouraged an increase in births.
ETRI-모아레 스캐너를 이용한 3차원 모델의 자동생성
권대현,최이배,이의택 한국방송공학회 1999 한국방송공학회 학술대회 Vol.1 No.1
The visualization of Moire´ or laser-scanned data has been explored by many researchers and has been an important issue on computer graphics research. In this paper, we present various techniques that handle tremendous amount of 3D range data which are generated by the ETRI- More´ Scanner. The techniques include constructing an efficient data structure, constructing triangle meshes and decimation and registration of multiple-mew range images and textures.
인터넷 트래픽 모니터링을 통한 네트워크 관리 시스템 모델링과 시뮬레이션
권대현,임준홍 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1
본 논문에서는 네트워크 관리 시스템(NMS)을 제안하고 구현하였다. NMS에서 네트워크 트래픽 장애를 MRTG을 사용해서 측정하였고 링크간 특성을 평가하였다. 또한 발생 가능한 네트워크 문제를 확인하였으며 네트워크 시뮬레이션을 수행하였다. 이러한 작업은 네트워크의 분석과 성능을 향상시키는데 사용될 수 있다. In this paper, Network Management System(NMS) is proposed and implemented. In the NMS, network traffic load is measured using MRTG and link-to-link characteristics are evaluated. Also, the possible causes of occurring network problems are identified and the network simulations are performed. This can be used to analyze and/or enhance the performances of the network.