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한태균,류대식,김홍철,허헌,엄경태,남궁숙,박만수,황우철,이관섭,Han, Tae-Kyun,Ryu, Dae-Sik,Kim, Heung-Chul,Hur, Hun,Eom, Kyeung-Tae,Namkung, Sook,Park, Man-Soo,Hwang, Woo-Chul,Lee, Kwan-Seop 대한영상의학회 1996 대한영상의학회지 Vol.34 No.5
Purose: To discribe the radiologic findings of idiopathic portal hypertension and to find the points of differentiation between idiopathic portal hypertension and liver cirrhosis. Material and Mathods: Four portograms in five patients who for four years had suffered from pathologically confirmed idiopathic portal hypertension were retrospectively analyzed and compared with a portogram obtained from a cntrol subject with liver cirrhosis. Results: Portographic findings of idiopathic portal hypertension were paucity of medium-sized portal branches, irregular and obtuse-angled division of peripheral branches, abrupt interruption and an avascular area beneath the liver margin. Conclusion: A portogram of idiopathic portal hypertension may be useful in differentiating this andliver cirrhosis.
정지궤도 위성통신 환경모의를 위한 100 MHz 대역폭의 위성링크 시뮬레이터 개발
이성재,김용선,한태균,Lee, Sung-Jae,Kim, Yong-Sun,Han, Tae-Kyun 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.5
The transponder simulator designed to simulate the transponder of military satellite communication systems in the geostationary orbit is required to have time delay function, because of 250 ms delay time, when a radio wave transmits the distance of 36,000 km in free space. But, it is very difficult to develop 250 ms time delay device in the transponder simulator of 100 MHz bandwidth, due to unstable operation of FPGA, loss of memory data for the high speed rate signal processing. Up to date, bandwidth of the time delay device is limited to 45 MHz bandwidth. To solve this problem, we propose the new time delay techniques up to 100 MHz bandwidth without data loss. Proposed techniques are the low speed down scaling and high speed up scaling methods to read and write the external memory, and the matrix structure design of FPGA memory to treat data as high speed rate. We developed the satellite link simulator in 100 MHz bandwidth using the proposed new time delay techniques, implemented to the transponder simulator and verified the function of 265 ms time delay device in 100 MHz bandwidth.