• Title/Summary/Keyword: load-balanced

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A Study on Load Balanced Routing and Wavelength Assignment Algorithm for Wavelength Routed Optical Networks (파장 분할 광 네트워크에서 로드 밸런싱 기법을 적용한 라우팅 및 파장할당 알고리즘 연구)

  • 박민호;최진식
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.40 no.10
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    • pp.1-7
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    • 2003
  • In this paper, we propose load balanced routing and wavelength assignment (RWA) algorithm for static model. The proposed algorithm arranges the routing paths over the link uniformly and assigns routing paths according to the length of routing paths orderly. Thus, the proposed algorithm can efficiently utilize the network resources. Through the computer simulation on layered-graph model, we prove that the proposed algorithm improves network throughput and reduces blocking probability comparing to first-fit algorithm [1]. Moreover, the proposed algorithm considerably reduces computational time.

A Study on the Parallel Operation Control Technique of On-line UPS System (무정전전원장치의 병렬운전 제어기법에 관한 연구)

  • 곽철훈;최규하
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.6
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    • pp.585-592
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    • 2003
  • The parallel operation system of UPS is used to increase reliability of power source at critical load. But parallel UPS system has a few defects, impedance is different from each other and circulating current occurs between UPSs, due to line impedance and parameter variation, though controlled by the same synchronization signal. According to such characteristic of parallel UPS, balanced load-sharing control is the most important technique in parallel UPS operation. In this paper, a novel power deviation compensation algorithm is proposed. it is composed of voltage controller to compensate power deviation that be calculated by using active and reactive current deviation between Inverters on synchronous d-q reference frame.

A Study on the Deformation of the Moving Pressure Plate in a Balanced Type Vane Pump (압력 평형형 베인 펌프의 가동 압력판 변형에 관한 연구)

  • 한동철;조명래;박신희;최상현
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1998.04a
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    • pp.277-285
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    • 1998
  • This paper presents the deformation characteristics of the moving pressure plate in a balanced type vane pump that widely used automotive power steering systems. Moving pressure plate can control the clearance between rotor and plate in accordance with load pressure variation; it always guarantees that pump to have optimal volumetric efficiency. In this paper, firstly, we calculate the acting force on the pressure plate, which is used to determine the angular position and load condition for analyzing the deformation of pressure plate. Secondary, finite element method is used for the deformation analysis. As results of acting force analysis, it is found that maximum difference of forces occurs at angular position 28$\circ$ from the small arc center of cam ring and load pressure is a dominant factor to affect acting force variation. The deformation of pressure plate increases as load pressure increases. At high load pressure, the deformation of pressure plate becomes larger than the initial clearance between rotor and plate. Therefore, it is required to design the plate for controlling the deformation.

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Asymptotics in Load-Balanced Tandem Networks

  • Lee, Ji-Yeon
    • 한국데이터정보과학회:학술대회논문집
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    • 2003.10a
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    • pp.155-162
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    • 2003
  • A tandem network in which all nodes have the same load is considered. We derive bounds on the probability that the total population of the tandem network exceeds a large value by using its relation to the stationary distribution. These bounds imply a stronger asymptotic limit than that in the large deviation theory.

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Asymptotics in Load-Balanced Tandem Networks

  • Lee, Ji-Yeon
    • Journal of the Korean Data and Information Science Society
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    • v.14 no.3
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    • pp.715-723
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    • 2003
  • A tandem network in which all nodes have the same load is considered. We derive bounds on the probability that the total population of the tandem network exceeds a large value by using its relation to the stationary distribution. These bounds imply a stronger asymptotic limit than that in the large deviation theory.

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Balanced Clustering based on Mobile Agents for the Ubiquitous Healthcare Systems (유비쿼터스 헬스케어 시스템에서 이동에이전트 기반 균형화 클러스터링)

  • Mateo, Romeo Mark A.;Lee, Jae-Wan;Lee, Mal-Rey
    • Journal of Internet Computing and Services
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    • v.11 no.3
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    • pp.65-74
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    • 2010
  • In the ubiquitous healthcare, automated diagnosis is commonly achieved by an agent system to provide intelligent decision support and fast diagnosis result. Mobile agent technology is used for efficient load distribution by migrating processes to a less loaded node which is considered in our design of a ubiquitous healthcare system. This paper presents a framework for ubiquitous healthcare technologies which mainly focuses on mobile agents that serve the on-demand processes of an automated diagnosis support system. Considering the efficient utilization of resources, a balanced clustering for the load distribution of processes within nodes is proposed. The proposed algorithm selects overloaded nodes to migrate processes to near nodes until the load variance of the system is minimized. Our proposed balanced clustering efficiently distributes processes to all nodes considering message overheads by performing the migration to the near nodes.

An Algorithm of SBIBD based Load Balancing Applicable to a Random Network (랜덤 네트워크에 적용 가능한 SBIBD기반의 부하 균형 알고리즘)

  • Lee, Ok-Bin;Lee, Yeo-Jin;Choi, Dong-Min;Chung, Il-Yong
    • Journal of Korea Multimedia Society
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    • v.11 no.3
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    • pp.331-340
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    • 2008
  • In order to make load balancing, workload information of nodes should be informed to the network. In a load balancing algorithm[13] based on the SBIBD(Symmetric Balanced Incomplete Block Design), each node receives global workload information by only two round message exchange with O (${\upsilon}{\sqrt{\upsilon}}$) traffic overhead, where ${\upsilon}$ is the number of nodes. It is very efficient but works well only when ${\upsilon}=p^2+p+1$ for a prime number p. In this paper, we generate a special incidence structure in order for the algorithm works well for an arbitrary number of nodes. In the experiment with w,($5{\leq}w{\leq}5,000$), nodes and more than 80% of receiving workload information, traffic overhead was less than O ($w{\sqrt{w}})$ and the result for standard deviation of traffic overhead showed that each node has largely balanced amount of traffic overhead.

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Load-balanced multi-agent model for moving patient management in mobile distribution environment (모바일 분산 환경에서 이동형 환자관리를 위한 부하 균형 다중 에이전트 모델)

  • Lee, Mal-Rye;Kim, Eun-Gyung;Zang, Yu-Peng;Lee, Jae-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.4
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    • pp.809-816
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    • 2010
  • This paper proposed about a load-balanced multi-agent model in mobile distribution environment to monitor moving patients and to deal with a situation of emergency. This model was designed to have a structure based on distribution framework by expanding a mobile system, and provides healthcare services based on real time situational information on moving patients. In order to overcome the limitation of middleware when we design system, we provided an abstract layer between applications and their base network infrastructure so that balance between QoS requests and network life can be maintained. In addition, clustering was used in cells for the efficient load distribution among multi-agents. By using Clustering FCM, we got optimal resources and had solve about transmission delay.

Synchronous Distributed Load Balancing Algorithm Employing SBIBD (SBIBD를 이용한 분산시스템의 부하 균형 알고리즘)

  • 김성열
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.2
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    • pp.386-393
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    • 2004
  • In order to maintain load balancing in distributed systems in a decentralized manner, every node should obtain workload information from all the nodes on the network. It requires $Ο({v^2})$ traffic overheads, where v is the number of nodes. This paper presents a new synchronous dynamic distributed load balancing algorithm for a ( v,k+1,1)-configured network topology, which is a kind of 2k regular graph, based on symmetric balanced incomplete block design, where v equals ${k^2}+k+1$. Our algorithm needs only Ο(v√v) message overheads and each node receives workload information from all the nodes without redundancy. And load balancing in this algorithm is maintained so that every link has same amount of traffic by √v for transferring workload information.

A study on the turning ability of a DWT 8,000-ton oil/chemical tanker by real sea trials - A comparison between the semi-balanced rudder and the flap rudder - (실선시험에 의한 DWT 8,000톤 선박의 선회성능 - Semi-balanced rudder and flap rudder -)

  • Lee, Hyeong-Geun;An, Young-Su;Park, Byung-Soo;Jang, Choong-Sik
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.51 no.2
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    • pp.245-256
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    • 2015
  • This study is intended to provide navigator with specific information necessary to assist the avoidance of collision and the operation of ships to evaluate the maneuverability of dead weight tonnage 8,000 tons Oil/Chemical tanker. The actual maneuvering characteristics of ship can be adequately judged from the results of typical ship trials. Author carried out sea trials based full scale for turning test in ballast condition and full load condition, semi balanced rudder and flap rudder. The turning circle maneuvering were performed on the starboard and port sides with $35^{\circ}$ rudder angle at the normal continuous rating. The results from tests could be compared directly with the standards of maneuverability of IMO and consequently the maneuvering qualities of the ship is full satisfied with its.