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김흥준,손세일,이광석,Kim, Heung-Jun,Son, Sei-Il,Lee, Kwang-Seok 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.12
P2P 기술은 효율적으로 파일을 배포하기 위해 많이 사용되고 있으며, 스트리밍 전송에서도 그 사용이 증가하고 있다. P2P 스트리밍은 시작-지연, 확장성, 실시간 재생에 대한 요구가 있지만, 어떤 요소들이 이 문제들에 영향을 주는지에 대한 연구가 부족하다. 본 논문에서는 메쉬-기반 P2P 시스템에서 다운로드와 동시에 콘텐츠를 재생하는 프로그레시브 다운로드에서 버퍼링에 대한 모델을 제시한다. P2P 스트리밍에서 사용되는 블록 선택 전략들 중 PDF(Playback Deadline First), Rarest를 분석하고, 이들을 이용한 혼합 선택을 제안한다. 제안된 혼합 선택은 앞으로 재생할 블록들과 피어가 이들을 수신 또는 미 수신 상태인지에 따라 동적으로 서로 다른 블록 선택 전략을 실행한다. 그 결과 단일 피어 관점에서 스트리밍 재생에 대한 QoS를 향상시키는 동시에, 오버레이 네트워크의 블록 분포를 개선한다. The P2P technology has been widely used to distribute files efficiently, and its use in streaming is rapidly increasing. P2P streaming has issues about startup-delay, scalability, and real-time playback, however, what affects these factors has not been researched sufficiently. This paper suggests a buffering model for progressive download within mesh-based P2P system, which corresponds to downloading and playing the content at the same time. It is used to analyze PDF(Playback Deadline First), Rarest algorithms which are block-selection strategies of P2P streaming and proposes a mixed selection of them. The mixed block selection strategy dynamically performs different strategies based on whether the blocks to be played are received or not. In consequence, it enhances the QoS of streaming in a single peer point of view, as well as improving block distributions in an overlay network.
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확장성을 고려한 계층적 시스템 성능 모델 및 시뮬레이션
김흥준 한국시뮬레이션학회 1995 한국시뮬레이션학회 논문지 Vol.4 No.2
The performance of a computer system depends on the system architecture and workload, and the high performance required in many applications can be achieved by the scalability of the system architecture and workload. This paper presents scalable workload, a performance metric of scalable speedup and hierarchical modeling for the scalable computer system as well as the development of the object-oriented simulator spmplC++ Which is an advanced C++ version of the discrete event-driven simulation environment smplE. In addition, this paper presents two examples of applying scalable speedup, hierarchical modeling and simulator smplC++ to analyze the performance effect of the sclcbility in a multiprocessor system and a network-based client/server system.
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소 태아 혈청이 연골의 Proteoglycan 합성에 미치는 영향
김흥준,김재도,김영옥,허만하 고신대학교(의대) 고신대학교 의과대학 학술지 1994 고신대학교 의과대학 학술지 Vol.10 No.1
Articular cartilage is a highly specialized connective tissue that covers the ends of long bones within the synovial joint cavity. It contains no blood vessels, no nerve fibers, and no lymphatics, accordingly it is nourished from the synocial flued by diffusion. Articular cartilage is composed of and extracellular matrix(ECM), collagen and proteoglycan. A small number of specific cells, chondrocytes, are embedded in the matrix. They are influenced by the alteration of components in synovial fluid which is derived from serum. To examine the effect of serum on biosynthesis of proteoglycan, this experiment was performed using human articular cartilages which were obtained from the patients who were operated due to various diseases. The human articular cartilages were incubated in 3 kinds of media : DMEM without fetal calf serum(FCS) (control), DMEM containing 1% FCS, and DMEM containing 20% FCS. The synthethized proteoglycan, incorporated with labeled S³⁵ sulfate, was extracted through PD-10 column after digestion by papain and measured the uptake of [35S] sulfate labeled proteoglycan by scintillation counter. To examine whether difference in concentration of fetal calf serum is reflected in staining intensity of immunohistochemistry for proteoglycan(avidin-biotin peroxidase complex), immunohistochemical staining was performed. The results were as followings : 1) Biosyntheses of proteoglycan in 1% and 20% FCS were increased 1.77 times and 2.27 respectively comparing with the control group. 2) In FCS group, biosynthesis of proteoglycan in 20% FCS was 1.29 times higher than that in 1% FCS. 3) No difference in staining intensity for proteoglycan in the variable concentrations of fetal calf serum was seen. The above results suggest that the compositional alteration of synovial fluid due to various factors influence the synthesis of the ECM in the articular cartilage and immunohistochemical staining is not sensitive enough to differentiate the quantitative difference of antigen.
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김흥준,손세일,김창근 진주산업대학교 산업과학기술연구소 2004 산업과학기술연구소보 Vol.- No.11
New and safe ways of payment such as electronic wallet, electronic money and electronic check have been developed and implementation of a secure credit card-based payment system. The system ensures that the payment information must be new and it can operate with the old credit card system.
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소 태아 혈청이 연골의 Proteoglycan 합성에 미치는 영향
김흥준,김재도,김영옥,허만하 고신대학교 의학부 1994 高神大學校 醫學部 論文集 Vol.10 No.1
Articular cartilage is a highly specialized connective tissue that covers the ends of long bones within the synovial joint cavity. It contains no blood vessels, no nerve fibers, and no lymphatics, accordingly it is nourished from the synovial fluid by diffusion. Articular cartilage is composed of an extracellular matrix(ECM), collagen and proteoglycan. A small number of specific cells, chondrocytes, are embedded in the matrix. They are influenced by the alteration of components in synovial fluid which is derived from serum. To examine the effect of serum on biosynthesis of proteoglycan, this experiment was performed using human articular cartilages which were obtained from the patients who were operated due to various diseases. The human articular cartilages were incubated in 3 kinds of media : DMEM without fetal calf serum(FCS) (control), DMEM containing 1 % FCS, and DMEM containing 20 % FCS. The synthethized proteoglycan, incorporated with labeled S^(35) sulfate, was extracted through PD-10 column after digestion by papain and measured the uptake of [35S] sulfate labeled proteoglycan by scintillation counter. To examine whether difference in concentration of fetal. calf serum is reflected in staining intensity of immunohistochemistry for proteoglycan (avidin-biotin peroxidase complex), immunohistochemical staining was performed. The results were as followings : 1) Biosyntheses of proteoglycan in 1 % and 20% FCS were increased 1.77 times and 2.27 respectively comparing with the control group. 2) In FCS groups, biosynthesis of proteoglycan in 20% FCS was 1.29 times higher than that in 1% FCS. 3) No difference in staining intensity for proteoglycan in the variable concentrations of fetal calf serum was seen. The above results suggest that the compositional alteration of synovial fluid due to various factors influence the synthesis of the ECM in the articular cartilage and immunohistochemical staining is not sensitive enough to differentiate the quantitative difference of antigen.
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