• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.17 no.2
• /
• pp.215-222
• /
• 2004

Drift design methods using resizing techniques have been presented as a practical drift control methods of high-rise buildings. Most drift design methods using the resizing techniques have adopted the cross-sectional area as the design variables for all structural members in a structure. However, the cross-sectional area is not always governing sectional property for the structural members, but the governing sectional property of each member is dependent on the characteristics of member forces. In this paper, a drift design method using the sectional property related to the governing displacement participation factor as the design variable of each member is presented and applied to the drift design of 20-story steel frame-shear wall system. It can be noted from example test that drift design method considering member characteristics shows similar or somewhat better results in the view point of structural weights and the accuracy of displacement estimation.

• Proceedings of the Korea Contents Association Conference
• /
• 2015.05a
• /
• pp.31-32
• /
• 2015

본 논문에서는 컴퓨터 망에서 동적라우팅 프로토콜로 다중영역을 지원하는 OSPF (Open Shortest Path First)를 중심으로 망 축약(summary), 타 프로톨과의 연동을 위한 재분배(redistribution), Virtual Link 등 복잡한 설정 기법을 연구하고 이를 신라대학교 LAN 구성에 적용한다. 시스코의 망 시뮬레이터 장비인 패킷트레이서를 활용하여 라우터와 스위치는 각각 2620XM Router, 2950T-24 Switch를 사용하고, 라우팅 프로토콜은 OSPF, EIGRP(Enhanced Interior Gateway Routing Protocol)를, 또한 이들 간의 연결을 위해서는 재분배를 이용하고, 다중 영역 중 백본 area에 인접하지 않는 area에 대한 연결을 위해서는 Virtual Link 등 여러 설정 기법을 사용한다. 전체 망 구성 연결 후에는 이들 설정에 대한 통신상태를 확인한다.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.26 no.2
• /
• pp.113-119
• /
• 2016

Wireless sensor networks are vulnerable to an adversary due to scarce resources and wireless communication. An adversary can compromise a sensor node and launch a variety of attacks such as false report injection attacks. This attack may cause monetary damage resulting in energy drain by forwarding the false reports and false alarms at the base station. In order to address this problem, a number of en-route filtering schemes has been proposed. Notably, a dynamic en-route filtering scheme can save energy by filtering of the false report. In the key dissemination phase of the existing scheme, the nodes closer to the source node may not have matching keys to detect the false report. Therefore, continuous attacks may result in unnecessary energy wastage. In this paper, we propose a key re-distribution scheme to solve this issue. The proposed scheme early detects the false report injection attacks using initially assigned secret keys in the phase of the key pre-distribution. The experimental results demonstrate the validity of our scheme with energy efficiency of up to 26.63% and filtering capacity up to 15.92% as compared to the existing scheme.

• Journal of KIISE:Computer Systems and Theory
• /
• v.28 no.12
• /
• pp.632-641
• /
• 2001

In this paper, we introduce new methods for hiding computation overheads involved in load redistributing for parallel computer of hypercube, mesh and tree topologies. The basic idea is either coalescing some phases of load redistributing to overlap the transfer on different links or dividing each phase into steps to pipeline the transfer of load unit by unit for maximum utilization of links. They proved effective in making links busy transmitting load as soon as possible, hence reducing the computation overheads involved in balancing. Proposed techniques experimented on hypercube, mesh or tree topologies reduce communication overheads by 20% to 50% compared with known methods.

• Journal of Internet Computing and Services
• /
• v.5 no.6
• /
• pp.93-101
• /
• 2004

In a receiver-initiated load redistribution algorithm, receiver(underloaded processor) continues to send unnecessary request messages for load transfer until a sender(overloaded processor) is found while the system load is light, Therefore, it yields many problems such as low cpu utilization and system throughput because of inefficient inter-processor communications until the receiver receives an accept message from the sender in this environment. This paper presents an approach based on genetic algorithm(GA) for dynamic load redistribution in heterogeneous distributed systems. In this scheme the processors to which the requests are sent off are determined by the proposed GA to decrease unnecessary request messages. The performance of proposed algorithm shows better than that of the conventional algorithm through various experiments.

• Proceedings of the Korean Information Science Society Conference
• /
• 2000.10b
• /
• pp.356-358
• /
• 2000

본 논문에서는 인간의 시각적인 감각을 멀티미디어 컨텐츠의 UMA 변환 서비스에 적용하여 영상의 다양한 디스플레이 크기의 사용자 단말기에 맞게 효율적으로 변화(해상도 축소나 Cropping) 기법을 제안하고 있다. 즉, 영상의 중요한 객체를 사각형 경계박스로 표시한 후 각각의 객체의 저자의 의도대로 사용자가 지각적으로 인식할 수 있는 최소의 공간 해상도 축소 정보를 정의하여, 영상의 변환 시 각각 객체를 사용자가 충분히 인식할 수 있는 한계치로 사용하여 효율적인 UMA 서비스를 보장하는 사용자 자원 재분배 기법을 제안한다. 또한, 본 논문에서 제안된 알고리즘을 기존의 방식과 비교하여 실험적으로 그 장단점을 비교한다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.24 no.6
• /
• pp.707-714
• /
• 2011

The inter-story drift ratio is used to evaluate the damage of buildings by the earthquake. This is known that as the inter-story drift ratio decreases, the seismic damage decreases. Although to reduce the inter-story drift ratio is the important issue in the seismic design, no practical inter-story drift design method has bean developed. This study presents an optimal inter-story drift design method to improve the seismic performance of the steel moment frames using the resizing algorithm. The objective function of the proposed method is to minimize the differences of the inter-story drift ratios so that the inter-story drift ratios of the building could be distributed evenly and be reduced. Because this method redesigns the sectional properties of structural members base on the displacement participation factor calculated by the unit-load method, this can improve the seismic performance of the structure without the iterative structural analysis. The efficiency of this algorithm was demonstrated by the application to steel moment frames.

• Product Safety
• /
• s.63
• /
• pp.38-40
• /
• 1998

퍼실리티 매니지먼트(facility management;FM)란 새로운 경영관리 기법으로 FM은 토지$\cdot$오피스$\cdot$시설$\cdot$설비$\cdot$기타 경영자산을 단순히 유지하고, 관리하는 것 뿐만 아니라 사업 포트폴리오의 관점에서 경영자산의 효과적인 활용이나 재분배를 도모하는 것을 의미한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07a
• /
• pp.235-237
• /
• 2005

디지털 형식으로 저장되어 있는 데이터의 불법적인 복사와 재분배는 전자상거래 상에서 디지털 컨텐츠를 판매하는 상점에게 매우 큰 문제가 된다. 핑거프린팅 기법은 암호학적인 기법들을 이용하여 디지털 컨텐츠를 불법적으로 재배포한 사용자를 찾아냄으로써 저작자의 저작권을 보호한다. 비대칭적 핑거프린팅 기법은 대칭적인 기법과 달리 사용자만이 핑거프린트가 삽입된 컨텐츠를 알 수 있어 사용자가 컨텐츠를 재배포했을 경우만 사용자가 고발되는 기법이다. 본 논문에서는 신뢰기관을 이용한 비대칭적 핑거프린팅 기법을 제안한다. 사용자의 핑거프린트는 신뢰기관이 생성하고 사용자의 익명공개키 쌍과 준동형의 암호를 이용하여 컨텐츠에 핑거프린트를 삽입함으로써 상점은 사용자의 핑거프린트를 알 수 없도록 하여 비대칭성을 만족하여 컨텐츠가 재배포되었을 경우 상점은 신뢰기관으로부터 정보를 받아 재배포자를 추적할 수 있다.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.13 no.1
• /
• pp.15-25
• /
• 2014

Bus signal priority is a name for various techniques to speed up bus public transport services at intersections with traffic signals. In this study propose methodology to optimize signal times for Early green, Green extension out of the active bus signal priority using deterministic delay model in isolated intersection on median bus lane. Fluctuation is found in the vehicle delay and person delay in the event that using this methodology redistributed to green time and checking slack green time is correct value by sensitivity analysis. As a result of the study, car delay is increased a little and person delay is decreased. As a result of slack green time sensitivity, delay is not much in it if variation of slack green time under 30%. But this methodology effectiveness is under claimed capacity if variation of slack green time over 30%.