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한호성(Ho Seong Han),윤여규(Yeo Kyu Youn),최국진(Kuk Jin Choe) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.3
N/A We have reviewed 34 cases of ulcerative colitis, experenced in the Seoul National University Hospital from January 1982 to August 1988. 1) The disease was most prevalent in fourth decades and the sex ratio (Male:Female) was 1:2.4. 2) The duration of symptoms was less than 5 years in 89.4% 3) The most common symptoms were hematochezia, abdominal pain, weight loss and bloody diarrhea in the order of frequency. 4) In anatomical distribution, left sided colitis were seen in 35.3%, pancolits in 26.5%, proctosigmoiditis in 23.5%, back-wash ileitis in 8.8%, and proctitis in 5.9%. 5) Medical treatment with TPN, steroid administration, steroid enema, were effecfive in 37.5%, 48 %, 63.6%, 50% respectively. 6) In all 8 proctocolectomy cases continent ileostomy were done in 7 cases and conventional ileostomy in 1 case. 1 case of continent ileostomy cases was converted to conventional ileostomy due to ileal pouch perforation. 7) Complications were 2 intestinal obstructions, 1 pouch perforation and 1 wound infection without any mortality. If treated early with accurate surgical indication, ulcerative colitis can be treated surgically with less morbidity and mortality
공유대역에서 무선 LAN과의 공존을 위한 IEEE 802.16 WMAN의 MAC 프로토콜
한호성(Ho Seong Han),이승형(Seung Hyong Rhee),박수원(Suwon Park),한기영(Kiyoung Han),강현구(Hyongoo Kang),윤순영(Soonyoung Yoon) 한국정보과학회 2010 정보과학회논문지 : 정보통신 Vol.37 No.2
본 논문에서는 IEEE 802.11 WLAN과 IEEE 802.16 WMAN 무선 네트워크가 같은 공간에서 공유대역(shared band)을 사용하는 상황에서 공존이 가능하도록 802.16 MAC 프로토콜의 수정을 제안한다. 제안하는 WMAN MAC 프로토콜은 WLAN을 고려하여 BS(Base Station)와 SS(Subscriber Station)가 통신할 때 WLAN의 통신을 지연시켜 충돌을 피하는 방식으로 동작한다. 즉, BS에서 SS로 데이터를 전송하는 하향 서브 프레임(downlink subframe)에서는 SS가 할당받은 버스트(burst) 구간에서 CTS(Clear To Send)를 사용하여 WLAN의 전송을 막고, SS에서 BS로 데이터를 전송하는 상향 서브 프레임(uplink subframe)에서는 BS가 CTS를 사용하여 WLAN의 통신을 지연시킨다. 제안하는 프로토콜은 WLAN과의 충돌을 방지하여 전송효율을 높일 수 있으며, 이를 시뮬레이션에 의해 분석한다. In this paper, we propose to modify the IEEE 802.16 MAC protocol in order to allow the coexistence of IEEE 802.11 and IEEE 802.16 wireless networks in shared bands. Our suggested protocol enables 802.16 WMAN to control WLAN devices for the coexistence. That is, in the downlink subframes(BS to SS), SS(Subscriber Station) prohibits WLAN to transmit by using CTS(Clear to Send) in order to protect it's burst. In the uplink subframes(SS to BS), on the other hand, BS(Base Station) sends CTS to block WLAN's communications. Our proposals enables the coexistence between WLAN and WMAN, and simulation results show that our protocols enhance the throughput of the entire system.