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멀티캐스트 서비스 환경에서 역치 기반의 연결 수락 제어 방안 연구
조성균,최성곤,이종민,최준균,Jo Seng Kyoun,Choi Seong Gon,Lee Jong Min,Choi Jun Kyun 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.12
본 논문에서는 방송, 통신, 인터넷이 하나가 되는 BcN 환경에서 멀티캐스트 서비스를 위한 연결 수락 제어(Call Admission Control) 방안에 대하여 알아본다. 제한된 시스템의 처리 용량으로 인해 서비스 요청에 대하여 적절하게 연결 수락을 제어함으로써 QoS를 효과적으로 지원하는 것이 필요하다. 그 방법으로 하나의 멀티캐스트 서비스에 대하여 세 가지 등급으로 나누어, 각 등급마다 처리할 수 있는 역치(Threshold)를 정하여 제한된 역치 범위 안에서 서비스 요청을 수락할 수 있다. 특히, 시스템 입장에서 등급별 서비스 요청에 대하여 수락 및 거절함에 따른 이익(Reward)과 손실(Penalty)을 근거로 정의되는 시스템 cost 모델인 GAIN을 정의하여 최대한의 이득을 가져올 수 있는 역치의 범위를 정하고, 이를 근거로 서비스 요청을 제어한다. 성능 분석을 위하여 시스템을 M/M/m/m으로 모델링하여 다양한 환경에서 GAIN을 알아보고, 제안된 알고리즘의 효과를 보인다. In this paper, we study a call admission control algorithm for supporting multicast service under the BcN environment where broadcasting, communication and Internet are converging to be one. It is necessary to control service requests with a certain criteria in order to guarantee QoS because the system capacity is limited. As a possible solution, we divide one multicast service into 3 classes and set up a threshold per each class to control service request. Especially, for the purpose of system benefit, we define system pay-off rate 'GAIN' with the term 'Reward' and 'Penalty' according to admit and reject service request. And we confine the range of threshold which makes GAIN to be maximized. For the performance analysis, we model the system as M/M/m/m queueing system, investigate GAIN under various conditions and show the effectiveness of the proposed algorithm.
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BcN 환경에서 효과적인 멀티캐스트 서비스를 위한 연결 수락 제어 방안
조성균,최성곤,최준균,Jo, Seng-Kyoun,Choi, Seong-Gon,Choi, Jun-Hyun 한국정보처리학회 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.12 No.6
본 논문에서는 방송, 통신, 인터넷이 통합되는 BcN 환경에서 멀티캐스트(Multicast) 서비스를 지원하기 위한 네트워크의 분기점(Rendezvous Point)에서 시스템 모델을 살펴본다 서비스에 따른 다중의 큐와 단일 서버로 이루어진 버퍼를 기하 분포의 배치 확률을 가지는 입력이 들어올 때, 단일 큐와 단일 서버로 모델링하여 입력률 $\lambda$에 따른 버퍼의 크기를 보이고, 서비스 제공자와 네트워크 운영자 사이의 관계를 알아본다. 이때 두 관점의 이익이 같아지는 최적의 입력률 ${\lambda}_{opt}$를 기준으로 새로운 서비스 요청에 대하여 이익을 기반으로 하는 호 수락 제어를 할 수 있는 범위를 제시한다. We focus on the RP (Rendezvous Point) system model in the multicast network based on BcN (Broadband Convergence Network) integrating broadcasting, telecommunication and Internet with one. Based on the condition multiple queues with different service and single server, when the arrivals tome in group with the site of the group geometrically distributed, we define the relationship between incoming arrival rate and corresponding buffer size. We also investigate the Profit according to both Service Provider and Network Operator Then we make a decision whether a new service request is accepted or not based on given interning rate range.
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안병철(Byeong Cheol Ahn),이양일(Yang Il Lee),최성곤(Seng Gon Choi),권중구(Joong Gu Kwen),이창형(Chang Hyung Lee),윤영미(Young Mee Yun),탁원영(Won Young Tak),관규식(Kyu Shik Kwak),최용환(Yong Hwan Choi),정준모(Joon Mo Chung) 대한내과학회 1994 대한내과학회지 Vol.46 No.1
N/A Background: Even though the hepatoma rupture has been known to be one of the fatal complications of hepatoma, the detailed studies on it were few in Korea. Methods: In order to investigate whether the he- patoma rupture can affect the survival of hepatoma patients or not, and also which factors can influence the prognosis of patients with hepatoma rupture, we studied 67 patients with hepatoma rupture and 74 age-matched hepatoma patients without rupture. Results: 1) Incidences of cirrhosis, ascites, hepatic encephalopathy, and unfavorable grade of Child`s classification were more prevalent in rupture group than in control group. Rupture group showed lower mean values of hemoglobin, prothrombin time, total protein and albumin, and higher mean level of GOT than those of control group. 2) But, there was no significant difference in survival time between rupture group and control group. 3) In rupture group, the survival time was more prolonged in patients with more favorable grade of Child`s classification, The survival time tended to be more prolonged in patients treated with TAE method than those managed with conservative treatment, but unfortunately, the results was statistically not significant, 4) In control group, survival time was prolonged in patients with more favorable grade of Child's classification and in those treated with TAE method. Conclusion: Treatment modality and liver status are most significant prognostic factors in hepatoma rupture patients and TAE method should be considered.
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경내경정맥 간내문맥간정맥 단락술에 의한 식도정맥류 출혈의 치료 효과
탁원영(Won Young Tak),이양일(Yang Il Lee),최성곤(Seng Gon Choi),권중구(Joong Gu Kwen),이창형(Chang Hyung Lee),윤영미(Young Mee Youn),안병철(Byeong Cheol Ahn),곽규식(Kyu Sik Kwak),최용환(Yong Hwan Choi),정준모(Joon Mo Chung),김용주(Yo 대한내과학회 1994 대한내과학회지 Vol.46 No.1
N/A Objectives: This study was performed to examine the effectiveness and prognostic factors of the transjugular intrahepatic portosystemic stent shunt (TIFSS) for the treatment of variceal bleeding secondary to portal hypertension. Methods: Between October 1991 and February 1993, TIPSS was performed in 21cirrhotic patients with variceal hemorrhage in Kyungpook National University Hospital. We reviewed the medical records and compare the portal pressure, portohepatic pressure gradient (PHG) and the endoscopic findings before and after TIPSS. Mean (+SD) follow up period was 7.0±3.9 months. Results: The mean portal pressure prior to TIPSS was 29.2mmHg and dropped to 19.9mmHg(p<0.001), and mean PHG from 21.9mmHg to 11.9mmHg(p<0.001) after shunt establishment. Variceal decompression after TIPSS was identified by early (within 10days) follow up endoscopy in 14 of 16cases, and late (3months after) in 4 of 5cases. Hepatic encephalopathy was recorded in 9patients. However, only 4patients developed recurrent encephalopathy. Recurrent hepatic encephalopathy cases showed significant decrease of mean PHG (14.5mmHg) than transient (7.4mmHg) and without (9.6mmHg) encephalopathy cases (p<0 05). Child-Pugh class C was important factor in the development of recurrent hepatic encephalopathy. Five patients died during the follow up period, 1 month mortality rate was 4.8%, And overall 6month survival rate was 80%, but only 50% in case of Child-Pugh class C. Conclusion: These results suggest that TIPSS is an effective method of portal decompression for the treatment of variceal bleeding and the most important prognostic factors are preprocedual hepatic reserve and decrease of PHG.
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