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检索条件"主题词=Scheduling algorithm"

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A High Performance Multicast Scheme Based on Virtual 2D Torus Topology

A High Performance Multicast Scheme Based on Virtual 2D Toru...

引用

International Conference on Networking (ICN)

作者： I-Shyan Hwang San-Nan Lee Kuo-Chang Chien Department of Computer Engineering and Science Yuan-Ze University Chungli Taiwan

Wavelength division multiplexing (WDM) not only can increase the bandwidth of backbone transmission network significantly, but can also decrease the network cost and make the controlling and maintaining of transmission easy. A new algorithm, torus topology conversion algorithm (TTCA), is proposed in this paper. It is made up of three parts: (1) the conversion algorithm, developed from ring-tree-based RWA (RTRWA), is employed to change topologies from real networks into torus networks; (2) the earliest available channel (EAC) algorithm is utilized for wavelength assignment; and (3) time division multiplexing (TDM) is used for the scheduling algorithm to proceed on transmission of packets. The system performance of the TTCA is compared with both the RTRWA and Steiner minimal tree (SMT). The simulation results show that the call blocking probability of the TTCA can be reduced 10% to 20% more than that of the RTRWA and the channel utilization of the TTCA can be increased 40% to 50% more than that of the RTRWA.

关键词： Network topology scheduling algorithm Wavelength division multiplexing Multicast algorithms Time division multiplexing Bandwidth Spine Costs Wavelength conversion Wavelength assignment

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An improved rate-monotonic scheduler and a real-time open control platform for robotic control algorithm verification

An improved rate-monotonic scheduler and a real-time open co...

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IEEE International Conference on Robotics and Biomimetics

作者： Weijun Zhang Zhicheng Wan Jianjun Yuan Zhixia Tang Institute of Robotics Shanghai Jiaotong University Shanghai China Henan Administration College Zhenzhou Henan China

ISBN: (纸本)9781424417612;9781424417582;1424417619

The verification of new intelligent robotic control algorithm not only requires the correction of computation but also satisfies the timing constraints. In this paper, an open real-time control environment is designed and implemented for robotic control algorithm verification. With Windows NT's real time extension RTX, the PC based control system will have good real-time performance for new control algorithm research. The software structure and the task scheduling approach are described in detail and the software comprises of real-time motion control & trajectory planning process, the use's operating interface process and the inter-process communication module. Considering the uncertainty in computation time of complex intelligent algorithms in robotic systems, the running time of the algorithm is monitored online and an improved rate-monotonic scheduler is presented for schedulability verification. To prove the effectiveness of the open real-time control environment and task scheduler, two examples, a direct driven air-bearing stage for IC packaging and a SCARA type robot for assembly, are introduced. The control performance and task scheduling results show that the open real time control environment and new scheduler are successful in complex control algorithm research and timing verification.

关键词： Robot control scheduling algorithm Processor scheduling Intelligent robots Communication system control Competitive intelligence Timing Real time systems Control systems Robotic assembly

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An Adaptive State Detection Service for Manufacturing Grid

An Adaptive State Detection Service for Manufacturing Grid

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International Conference on Semantics, Knowledge and Grid (SKG)

作者： Huifu Zhang Fangmin Li Hong Wen Deshun Liu Xiaoming Wang Hunan University of Science and Technology Xiangtan China Wuhan University of Technology Xiangtan China Hunan University of Science and Technology Wuhan China Wuhan University of Technology Wuhan China

Manufacturing grid serves as a distributed platform for integrating manufacturing resources and offering shared service. The state knowledge of the manufacturing resources is recorded efficiently. Thus resource exceptions can be timely noticed and removed to ensure reliable service. Given the features of manufacturing grid and the strategy of failure detector in the mode of PULL, this paper proposes a new mode of state detection algorithm for manufacturing grid. This algorithm is capable of meeting various demands of all kinds of manufacturing resources, and supporting the strategy of scheduling priority of local resources demanding no clock synchronization. Data from a manufacturing grid test bed shows that the algorithm can accurately and dynamically record the resource state, and it can meet the demands of resource detection in the manufacturing grid.

关键词： Heart beat Detectors Delay effects Pulp manufacturing Job shop scheduling Detection algorithms scheduling algorithm Clocks Synchronization Testing

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FL-PCP: Frequency Locking for Energy-Efficient Real-Time Task Synchronization

FL-PCP: Frequency Locking for Energy-Efficient Real-Time Tas...

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IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA)

作者： Ya-Shu Chen Chuan-Yue Yang Tei-Wei Kuo Department of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan ROC ROC Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan ROC

In the past decade, energy-efficient real-time task scheduling has been widely explored in terms of various optimization problems. With a very different goal, this paper considers real-time task synchronization protocols with the minimization of energy consumption. We propose the concept of frequency locking and extend the priority ceiling protocol by locking the processor frequency in a restricted way so that the cost in frequency switching is better managed. algorithms are proposed to assign tasks base frequencies in the minimization of the energy consumption and with the consideration of schedulability tests. The capability of the proposed methodology is evaluated by a series of experiments, for which encouraging results were presented.

关键词： Energy efficiency Frequency synchronization Protocols Processor scheduling Energy consumption scheduling algorithm Costs Minimization methods Testing Voltage

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System Level Performance of Cellular WiMAX IEEE 802.16 with SDMA-enhanced Medium Access

System Level Performance of Cellular WiMAX IEEE 802.16 with ...

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IEEE Conference on Wireless Communications and Networking

作者： Ralf Pabst Jan Ellenbeck Marc Schinnenburg Christian Hoymann RWTH Aachen University Germany Institute of Communication Network Munich University of Technology Germany

Recent years have witnessed an ever-increasing interest in smart antenna technologies to boost the capacity of existing and future wireless systems. As one of the first standards the wireless metropolitan area network IEEE 802.16 (WiMAX) provides means to support these techniques. This paper investigates the potential of smart antenna beamforming and space division multiple access (SDMA) in the context of a cellular IEEE 802.16 deployment. It presents the system level performance evaluation of a joint TDMA/SDMA scheduling approach taking into account the influence of intra- and inter-cell interference generated by concurrent SDMA transmissions. The performance of single- and multi-user beamforming is compared with the non-beamforming reference case.

关键词： WiMAX Array signal processing Multiaccess communication Interference Communication networks Signal processing algorithms scheduling algorithm Space technology Wireless LAN Metropolitan area networks

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Checkpointing Based Fault Tolerance Patterns for Systems with Arbitrary Deadlines

Checkpointing Based Fault Tolerance Patterns for Systems wit...

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International Conference on Advanced Computing and Communications (ADCOM)

作者： Smriti Agrawal Rama Shankar Yadav Nabanita Das Department of Computer Science and Engineering Motilal Nehru National Institute of Technology Allahabad India

This paper aims to provide a fault tolerant scheduling algorithm that have fault tolerance patterns for periodic task sets with arbitrary deadlines. The fault tolerance is achieved by checkpointing where number of checkpoint is decided on the bases of the lemmas proposed. These patterns provide minimum tolerance to all the releases and an improved tolerance to some releases pertaining to the availability of the slack time. They may be binary (i.e., either provide maximum or minimum tolerance to a release) or greedy (i.e., provide an improved tolerance whenever it is possible) in nature. Theorems have been proposed to ensure that the task set is schedulable with at least minimum fault tolerance. The effectiveness of the proposed patterns have been measured through extensive examples and simulations.

关键词： Checkpointing Fault tolerant systems Real time systems Fault tolerance Multiprocessing systems Redundancy Delay Computer science scheduling algorithm Frequency

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Chaotic Ant Colony algorithm for Preliminary Ship Design

Chaotic Ant Colony Algorithm for Preliminary Ship Design

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International Conference on Natural Computation (ICNC)

作者： Yan Jin Yao Zhao School of Transportation Huazhong University of Science and Technology Wuhan Hubei China

This paper describes the improved chaotic ant colony algorithm (CACA) for the preliminary ship design. An optimization model for ship design has been identified as a problem with multiple local optima representing widely varying sets of designs. The model as developed handles the ship design optimization problem as a multivariable nonlinear optimization process and aims at a global optimum solution of the problem. Ant colony algorithm (ACA) is a multi-agent optimization algorithm, which simulates the foraging behavior of ants for solving various complex combinatorial optimization problems. The CACA is based on the AC A combined with multiple scale optimization and tabu search which can improve efficiently the deficiency of long searching time and sinking into local optima of simple ACA. This algorithm was tested on some standard test functions and satisfying results were obtained. After that an attempt on solving the preliminary ship design problem, it performance was observed to be in effect.

关键词： Chaos Marine vehicles algorithm design and analysis Ant colony optimization Chaotic communication Testing Design optimization scheduling algorithm Traveling salesman problems Stochastic processes

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Minimizing Average Flow-time : Upper and Lower Bounds

Minimizing Average Flow-time : Upper and Lower Bounds

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Annual IEEE Symposium on Foundations of Computer Science

作者： Naveen Garg Amit Kumar Indian Institute of Technology Delhi India

We consider the problem of minimizing average flow time on multiple machines when each job can be assigned only to a specified subset of the machines. This is a special case of scheduling on unrelated machines and we show that no online algorithm can have a bounded competitive ratio. We provide an O(log P)-approximation algorithm by modifying the single-source unsplittable flow algorithm of Dinitz, ***. Here P is the ratio of the maximum to the minimum processing times. We establish an Omega(log P)-integrality gap for our LP-relaxation and use this to show an Omega(log P/log log P) lower bound on the approximability of the problem. We then extend the hardness results to the problem of minimizing flow time on parallel machines and establish the first non-trivial lower bounds on the approximability; we show that the problem cannot be approximated to within Omega(radiclog P/log log P).

关键词： scheduling algorithm Polynomials Approximation algorithms Computer science Parallel machines Security Single machine scheduling Web server Fluid flow measurement Time measurement

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A Memetic Approach to Fuzzy Job Shop Based on Expectation Model

A Memetic Approach to Fuzzy Job Shop Based on Expectation Mo...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Ines Gonzalez-Rodriguez Camino R. Vela Jorge Puente Department of Mathematics Statistics and Computing University of Cantabria Santander Spain A.I. Centre and Department of Computer Science University of Oviedo Gijon Spain

In the sequel we consider a job shop problem with uncertain processing times modelled using triangular fuzzy numbers. A scheduling model based on the expected value of the makespan is introduced. Later, a genetic algorithm based on codification of permutations with repetitions, a decoding algorithm to generate possibly active schedules and a local search schema are defined in order to solve the job shop problem. Experimental results illustrate the potential of the proposed methods.

关键词： Job shop scheduling Genetic algorithms Uncertainty Decoding scheduling algorithm Finance Simulated annealing Evolutionary computation Shape Mathematics

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Performance Impact of Advance Reservations from the Grid on Backfill algorithms

Performance Impact of Advance Reservations from the Grid on ...

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第六届网格与协同计算国际会议(The Sixth International Conference on Grid and Cooperative Computing GCC 2007)

作者： Bo Li Dongfeng Zhao School of Information Science and Engineering Yunnan University Kunming 650091 China

Advance Reservations are important to guarantee the Quality of Services of Grid Jobs. However, the influence of AR from the Grid on local parallel schedulers is not clearly known. EASY backfill and Conservative backfill are two important parallel scheduling algorithms. This paper examined their procedures to support AR, evaluated their performances impacted from AR by using discrete event simulations with real trace from the parallel workload archive. Results show that as AR request increases, EASY backfill is preferable with higher utilization and lower average expansion factor and average weighted response time for both of local and AR Grid jobs. The use of conservative backfill typically provides both of local jobs and AR Grid jobs improved predictability and certainty, at the cost of lower utilization and degraded performance for both of local and AR Grid jobs.

关键词： scheduling algorithm Discrete event simulation Delay Computational modeling Performance evaluation Grid computing Processor scheduling Information science Quality of service Costs

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