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서주하,정부영,유현희,Seo, Ju-Ha,Jung, Boo-Young,Ryu, Hyun-Hee 강원대학교 산업기술연구소 1999 産業技術硏究 Vol.19 No.-
In this paper, We propose a new flow control scheme based on Queue Dynamics and it's Estimate Information in order to achieve higher throughput and network efficiency using control of the best-effort traffic. The feedback Information gives a result that compare queue length with queue threshold. Traffic changes at the time when queue length is cross over under the queue thresholds. The performance of the purposed scheme has been analyzed mathematically and we verify efficiency of the proposed method by means of simulation.
서주하,조철희,Seo, Ju-Ha,Cho, Churl-Hee 한국정보처리학회 1995 정보처리논문지 Vol.2 No.3
이 논문은 실내용 무선 랜의 효율적인 전송 스케줄에 대한 것이다. 제안한 방법 은 대역폭의 재사용으로 전송 지연을 상당히 감소시켰으며 사용도를 크게 증가시켰다. 이 논문은 무선 랜의 구조 소개와 대역폭 재사용을 이용한 SSA 알고리즘을 서술하였고 컴퓨터 시뮬레이션을 통한 결과를 제시하였다. In this paper, we propose an efficient transmission schedule which can be used in indoor wireless LAN. It reduces considerably the time delay and increases the throughput by reusing the bandwidth. We describe the architecture of the wireless LAN, the algorithm of step-by-step allocation of time slot reusing the resource and the results of the computer simulation.
신뢰성 있는 멀티캐스트 통신에서의 NACK 피드백을 이용한 흐름 제어
서주하(Ju Ha Seo),유소영(So Young Yu) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1A
In this paper, we propose flow control scheme for reliable multicast communication. When the sender sends packets faster than receiver's capacity, the packet loss occurs by buffer overflow at receiver. The receivers detect the [ass and send the NACK, NACK-based retransmission is said to be effective because it can avoid implosion of NACK packets. To prevent further overflow, some flow control schemes should be adapted. In this paper, we proposed a rate control scheme for NACK-based flow control in reliable multicast communications. When the NACK are generated by receivers, sender decreases the transmission rate preventing the fall of throughput by excessive decrease. We show that the proposed scheme improves throughput compared with the case of no flow control.
정보통신 : 무선 랜의 효율적인 다중억세스 프로토콜에 대한 연구
서주하(Seo Ju Ha),조철희(Cho Churl Hee) 한국정보처리학회 1995 정보처리학회논문지 Vol.2 No.3
In this paper, we propose an efficient transmission schedule which can be used in indoor wireless LAN. It reduces considerably the time delay and increases the throughput by reusing the bandwidth. We describe the architecture of the wireless LAN, the algorithm of step-by-step allocation of time slot reusing the resource and the results of the computer simulation.
권호열(Ho Yeol Kwon),서주하(Ju Ha Seo) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.1B
본 논문에서는 푸리에 위상을 이용한 영상복원에서의 저역필터링의 효과에 대하여 논의하였다. 영상복원에 사용하는 제약조건으로서 영상의 크기, 영상의 밝기범위등을 사용하였으며 복원된 영상에서 발생하는 임펄스잡음을 감소시키기 위하여 평균값과 중앙값을 이용한 저역필터링을 매 순환마다 사용하였다. 끝으로 표준영상을 이용한 실험결과를 통하여 여러 가지 제약조건과 저역필터링이 영상복원에 미치는 효과를 분석하였다.
계층셀구조에서 계층별 큐를 이용한 핸드오프 강제종료의 개선방안
김영일(Kim Young il),서주하(Seo Ju Ha) 강원대학교 산업기술연구소 2002 産業技術硏究 Vol.22 No.1
In this paper, we proposed separate queue scheme in each hierarchical cell for effective use of wireless channel. This method reduces the blocking rate of high speed mobile station’s handoff in hierarchical cellular systems. Basically for the high speed mobile stations channels are allocated in macrocell and for the low speed mobile stations channels are allocated in microcell. In order to reduce the rate of forced handoff termination, some reservation channels are employed for the fast handoff calls in the macrocells. And the queue is located in each cell to be able to store handoff requests and takeback requests. The overflowed mobile stations are able to perform takeback as soon as a corresponding channel is available.