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조유희(Yoohce Cho),서영일(Youngil Seo),김이한(Yihan Kim) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.10
Emerging of cloud computing service has made network infrastructure a service component as NaaS (Network as a Service). Ensuring the confidentiality, integrity, and availability of customers systems and information is of the utmost importance to network provider, as is maintaining trust and confidence in cloud computing business which deals with critical information personal and enterprise properties Especially, a secure connectivity and E2E QoS between enterprise network and cloud data centers are mandatory condition with regard to enterprise cloud service. In this paper, we consider security requirements in WAN and LAN region of cloud network service and on the basis of that, we make an estimate the evolution of cloud service network.
비디오 콘텐츠 전달 최적화된 스마트 네트워크의 구조 및 기능
조유희(Yoohee Cho),서영일(Youngil, Seo) 대한전자공학회 2011 대한전자공학회 학술대회 Vol.2011 No.12
Internet business environment is changing rapidly from web-centric business to video content delivery. Now a day, the share of traffic is more occupied by file sharing and video contents than web surfing. Since these large size video contents are growing, network operators and internet providers start to build cooperation in order to ensure the transport QoS. The change of the use of internet traffic and a surge in traffic as a way to align revenue needs Smart Network which is able to aware the service and provide a high-quality content delivery by allocating the best network resources. Smart network is proposed for optimal structure and functionalities for contents delivery over IP network. Smart Network performs the role of foundation for the evolution for Content-Centric Network; CCN. In this paper, we propose the architecture and functionalities of Smart Network to provide the video contents delivery in an efficient and optimized way.
비좌굴 knee brace가 설치된 철골조 건물의 내진설계
김진구(Kim Jinkoo),서영일(Seo Youngill) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.2
Analytical models and a performance-based seismic design procedure were proposed for a steel structure with buckling-restrained knee-braces. The hinge-connected main structural members, such as beams and columns, were designed only for gravity loads, and all the lateral seismic load was resisted by the braces. The design procedure was based on the concept of the capacity spectrum method, and the size of knee-brace was estimated using the equivalent damping required to be supplied to meet the given performance objective. Parametric study was performed with design variables such as yield stress and cross-sectional area of knee-braces to find out proper slope and yield strength of the brace. The proposed method was applied to a five-story structure with buckling-restrained knee-braces. According to the time-history analysis results, the maximum displacement of the model structure retrofitted by knee braces turned out to correspond well with the desired target displacement.
음향과 저층 트롤 기법을 이용한 남해 저층 어군의 주,야 밀도분포 조사
이형빈 ( Hyunhbeen Lee ),서영일 ( Youngil Seo ),오택윤 ( Taegyun Oh ),최정화 ( Junghwa Choi ),조현수 ( Hyunsu Jo ),최광호 ( Kwangho Choi ) 한국수산과학회(구 한국수산학회) 2015 한국수산과학회지 Vol.48 No.5
The distributions of demersal fish along the coast of the South Sea, Korea, were estimated from a hydroacoustic survey and bottom trawl catches in April of 2015. Acoustic data were collected at 38 kHz, and converted into the nautical area scattering coefficient (NASC, m2/n·mile2) for 0.1 n·mile along eight transects during day and nighttime. Various demersal fish species were collected and the dominant species comprised no more than half of the catch. The estimated acoustic density of demersal fish compared well with the cumulative catch weight from bottom trawl catches in daytime, but showed a low correlation at nighttime. The NASC of pelagic fish determined for anchovy was correlated with water temperature. The combined hydroacoustic and trawl method can be used to understand the spatial/temporal structure and estimate the density of demersal fish in coastal areas.
정재훈(Jaehoon Jeong),장혜령(Hyeryung Jang),이융(Yung Yi),모정훈(Jeonghoon Mo),오호석(Hoseok Oh),서영일(Youngil Seo) 대한전자공학회 2011 대한전자공학회 학술대회 Vol.2011 No.12
To cope with exploding Internet traffic, telecommunication companies are considering smart network technology. This paper evaluated the impact of Internet traffic for the smart network when ISP utilized nodes smartly so that they can do smart caching, ISP controls both routing and traffic matrix as a Telco-CDN so that they can decide more efficient traffic routing policy and ISPs cooperates each other so that they efficiently control IX traffic between them as a Telco-CDNi. Finally, the economic valve of smart network from the traffic reduction of these points was estimated.