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절연 파괴 특성을 이용한 에폭시 복합체의 절연 신뢰도 예측
박건호,이준웅 광운대학교 신기술연구소 1996 신기술연구소논문집 Vol.25 No.-
본 연구에서는 송배전 계통에서 변성기의 몰드 재료로서 널리 사용되고 있는 에폭시 수지를 시료로 하여 설정해 높은 배합비에 따라 5종으로 제작한 각 시편에 대해 절연 파괴 실험을 하였다. 절연파괴 데이터를 가지고 와이블 분포식을 이용하여 임의의 허용 파괴 확률에서의 허용인가 전계의 값을 추정하였으며 절연 안전성을 판단하기 위하여 경년 열화(經年劣化) 데이터의 통계 처리를 행한 결과 허용 파괴 확률을 0.1[%]로 하였을 때, 허용 인가 전계는 21.5[kV/mm] 이하가 되어야 함을 확인할 수 있었다. In this study, the dielectric breakdown of epoxy composites used for transformers was experimented and then its data were simulated by Weibull distribution probability. The more hardener increased the stronger breakdown strength at low temperature because of cross-linked density by the virtue of ester radical, and the breakdown strength of specimens with filler was lower than it of non-filler specimens because it is believed that the adding filler forms interface and charge is accumulated in it, therefore the molecular motility is raised, the electric field is concentrated, and the acceleration of electron and the growth of electron avalanche are early accomplished. From the analysis of Weibull distribution, it was confirmed that as the allowed breakdown probability was given by 0.1[%], the applied field value needed to be under 21.5[kV/mm].
GCM : 유연한 통신을 위한 일반적 호 모델 A Generic Call Model for Seamless Communication
김건웅 木浦海洋大學校 2000 論文集 Vol.8 No.1
The services in one particular network are deployed in accordance to its specific call model. Consequently, there are different implementations of a service in different networks. The proposed Generic Call Model and the Layered Call Processing Architecture are intended to deploy new applications easily and effectively while being transparent from the evolving network technologies. In particular, the Generic Call Model, represents a call model on generic networks as logical network providing network functions for services independent of the employed network technologies. If the service provider can deploy services on the generic call model, users can use the same application in the same manner as in any other networks. The Layered Call Processing Architecture is the means to convert a generic call to the specific call provisional to the employed network technologies. Essentially, the proposed architecture is aimed to guarantee the users' QoS in the integrated network environment. Many research activities concerned with network interoperability have focused merely on the connectivity, unable to provide guarantee on the users' QoS. The overall objective of the proposed generic call model and layered call processing architecture is to provide an ability to integrate dissimilar networks such as telecommunication networks, computer networks, mobile networks, satellite networks, etc. to achieve seamless communication.
위암 환자에서 da Vinci<SUP>®</SUP> Surgical System을 이용한 위절제술의 초기 경험
허건웅(Geon-Ung Heo),김민찬(Min-Chan Kim),정갑중(Ghap-Joong Jung),최석렬(Seok Reyol Choi) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.5
Purpose: To assess the feasibility of the da Vinci<SUP>®</SUP> surgical system in performing gastrectomies for gastric cancer. Methods: Between 31 December 2007 and 30 June 2008, twenty patients underwent robotic gastrectomies using the da Vinci<SUP>®</SUP> surgical system for gastric cancer. Retrospectively, clinicopathologic and postoperative surgical outcomes were retrieved from the Stomach Cancer Database at Dong-A University Medical Center. Results: Two patients with serosa invasion required conversion to laparotomy. Seventeen robotic distal gastrectomies and one robotic total gastrectomy were performed. Most patients underwent D1+β or D2 lymph node dissection. The average number of retrieved lymph nodes was 41. Mean operative time was 271 minutes. Estimated blood loss was 30 ml and mean postoperative hospital stay was 5.1 days. No postoperative complications were reported. Conclusion: While application of robotic technology for gastric cancer is technically feasible, problems of long operative times and extremely high costs remain. More randomized studies comparing long-term surgical outcomes between robotic, conventional open, and laparoscopic surgery are needed.
UAV를 활용한 농촌지역 비점오염원 야적퇴비 관리상태 및 적재량 변화 모니터링
박건웅 ( Geon-ung Park ),박경훈 ( Kyung-hun Park ),문병현 ( Byung-hyun Moon ),송봉근 ( Bong-geun Song ) 한국지리정보학회 2019 한국지리정보학회지 Vol.22 No.2
농촌지역에서 야적퇴비가 비점오염원으로 작용하고 있으나, 정량적으로 분포 및 적재량이 산정되지 않아 야적퇴비가 유실되어 하천 수질에 미치는 영향을 파악하기 어렵다. 본 연구에서는 지상 LiDAR를 활용하여 UAV(Unmanned Aerial Vehicle)의 야적퇴비 데이터를 검증하고, 수동조종 비행으로 UAV를 활용하여 야적퇴비 탐색 및 촬영 후 관리상태 및 적재량 변화를 파악함으로써, 수계에 미치는 영향을 판단하기 위한 기초자료를 확보하고자 한다. 지상 LiDAR를 기준으로 정확도를 비교분석한 결과 DSM(Digital Surface Model)에 대해 약 0.21m 이내의 차이를 보이며 적재량의 정확도는 93.24%로 나타나, UAV 영상을 이용하여 야적퇴비의 적재량을 산출하고 활용하기에 충분하다고 판단된다. UAV를 활용하여 야적퇴비의 관리상태를 확인할 수 있었으며, 총 야적퇴비 적재량은 1,172.16㎥, 1,461.66㎥, 1,350.53㎥순으로 나타나 야적퇴비 적재량 변화를 파악할 수 있었다. 본 연구의 결과는 UAV를 활용하여 효율적인 비점오염원 관리에 기여할 수 있을 것으로 판단된다. In rural areas, composting is a source of non-point pollutants. However, as the quantitative distribution and loading have not been estimated, it is difficult to determine the effect of composting on stream water quality. In this study, composting datum acquired by unmanned aerial vehicle(UAV) was verified by using terrestrial LiDAR, and the management status and load change of the composting was investigated by UAV with manual control flight, thereby obtaining the basic data to determine the effect on the water system. As a result of the comparative accuracy assessment based on terrestrial LiDAR, the difference in the digital surface model(DSM) was within 0.21m and the accuracy of the volume was 93.24%. We expect that the accuracy is sufficient to calculate and utilize the composting load acquired by UAV. Thus, the management status of composting can be investigated by UAV. As the total load change of composting were determined to be 1,172.16㎥, 1,461.66㎥, and 1,350.53㎥, respectively, the load change of composting could be confirmed. We expect that the results of this study can contribute to efficient management of non-point source pollution by UAV.