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Service adaptive Network Architecture(SaNA)을 활용한 콘텐츠 전송 시스템
공석환(Seok-Hwan Kong),이재용(Jai-Yong Lee) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.6(네트워크)
최근 몇 년 사이 인터넷을 통해 접속 가능한 디바이스가 다양해지는 한편 디바이스가 콘텐츠의 사용자가 아닌 제공자가 되면서 콘텐츠 트래픽이 급속하게 증가하고 있다. 이와 같은 콘텐츠 트래픽이 기존과는 다른 패턴을 갖기 때문에, 효율적인 콘텐츠 전송 서비스를 위한 다양한 연구가 진행 중이다. 대표적 콘텐츠 전송 서비스 기술인 CCN(Contents Centric Network)은 기존의 기술 구조와 상이한 혁신적인 구조를 갖고 있기 때문에 기존의 네트워크와의 호환 문제가 발생한다. 이와 같은 문제를 해결하기 위해 본 논문에서는 CCN과 기존 망과의 연동 시 효율적 콘텐츠 전송을 위한 SaNA(Software adaptive Network Architecture) 구조를 제안한다. 이는 미래 인터넷의 핵심 기술 분야인 CCN 과 소프트웨어 정의 네트워킹 기술(Software Defined Networking : SDN) 을 활용하여 기존 망에 점진적으로 적용해 나가기 위한 융합 시스템이다. SaNA를 통해 콘텐츠를 서비스하는 경우, 기존 네트워크 대비 네트워크 대역폭 효율성을 두 배로 높일 수 있고, 콘텐츠 전송 시간도 약 1.7 배 단축시킬 수 있다. (스타일-요약본문) In recent years, various contents traffics are increasing according to the various internet connectable devices which have become contents provider. Because these contents traffics show different pattern from previous one, many researches for efficient contents delivery system are in progress. CCN(Contents Centric Network), one of the representative research subject, has inter operation problem with a current network because it has clean-state architecture. In this point of view, this paper suggests the SaNA(Service adaptive Network Architecture) for efficient contents delivery when it inter operates with current network architecture. SaNA is a convergence system which can be gradually applied to current network using CCN and SDN(Software Defined Network) which are core future internet technologies. Appling this system on the contents delivery service, it can increase the network bandwidth utilization by two times and decrease the contents delivery time by 1.7 times.
평면비대칭을 고려한 추가 감쇠기가 있는 시스템의 간략화된 지진응답해석
한상을(Han Sang-Eul),최문호(Choi Moon-Ho),공석환(Kong Seok-Hwan) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.12
This study investigates the effectiveness of proposed modal analysis method using the pseudo-force to deal with supplemental damping in the seismic analysis of elastic systems. On this study, the one-way asymmetric systems are considered because these will undergo lateral and torsional motion simultaneously due to supplemental damping and stiffness eccentricities. For the purpose of this study, the analysis is performed with the consideration of large range of system parameters, such as asymmetric of system and distribution of supplemental damping. And, the CPU running times are compared to investigate the effect of additional procedure on proposed methods. Finally, these proposed methods are applied to a three-story one-way asymmetric building with supplemental damping on each floor. These analytical results are compared with those obtained by direct integration method and conventional approximate method, which neglects the off-diagonal terms of the transformed damping matrix. It is found that the proposed methods can significantly improve the accuracy of the analytical results compared to conventional approximate method on large range of system parameters although it need a little additional analysis time.
전산해석을 통한 마찰교반용접용 스핀들의 에어베어링 강성 예측 연구
김진우(Jin-Woo Kim),박민성(Min-Sung Park),공석환(Seok-Hwan Kong),설상석(Sang-Seok Seol),김기수(Ki-Soo Kim),정원지(Won-Ji Chung) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.2
Recently, as global concerns regarding the environment have surged, changes in material-joining technologies have transpired. Friction stir welding, which is much more environmentally friendly than the existing welding methods, is attracting attention as a new alternative. This paper presents a method for predicting the stiffness using computational analysis when designing a spindle for frictional stir welding by applying air bearings rather than conventional ball bearings. Through fluid analysis, the pressure exerted on the spindle by the air entering through the inlet is calculated. and calculate the 0.005 ㎜. Additionally, the pressure in an eccentric state is calculated. The pressure is converted to stiffness using a formula, the corresponding stiffness is applied to the spindle, and the radial load generated during friction is input at the end of the spindle. Finally, a structural analysis is conducted to determine whether the stiffness is sufficient to determine the feasibility of the design.