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检索条件"主题词=scheduling algorithm"

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scheduling outpatients in hospital examination departments

Scheduling outpatients in hospital examination departments

引用

IEEE International Conference on Industrial Engineering and Engineering Management

作者： Xiaofeng Hu Hui Wu Shaoming Zhang Xing Dai Ye Jin Shanghai Jiao Tong University Shanghai CN Shanghai Ninth People Hospital 200011 China

Outpatients scheduling problem in examination departments allocates hospital equipments to patients and decides on the time to perform examination. This task plays an important role in utilizing the limited hospital equipments efficiently while ensuring quality of service for patients. First, the history examinations data of the hospital is analyzed, and the bottleneck department is defined. Then, some dispatching rules for the outpatient examination are developed to minimize total waiting time subject to minimum idle-time of the equipments in bottleneck department. Computational experiments are performed on the real data collected from Shanghai Ninth People Hospital, and the results show that it is efficient to reduce the waiting time of the outpatients.

关键词： Hospitals Job shop scheduling Dispatching History Magnetic resonance imaging Heuristic algorithms scheduling algorithm Mechanical engineering Quality of service Processor scheduling

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Task scheduling in the Georgia Tech digital signal multiprocessor

Task scheduling in the Georgia Tech digital signal multiproc...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： B.A. Curtis V.K. Madisetti Entry Systems Division IBM Corporation Boca Raton FL USA Electrical Engineering Georgia Institute of Technology Atlanta GA USA

The use of realistic structural and behavioral level descriptions of digital signal multiprocessors to find rate optimal and processor optimal schedules for implementation on multiprocessor digital signal processor (DSP) systems is addressed. Unlike previous work, the digital signal multiprocessor compiler (DSMP-C1) explicitly considers the location of operands, the number of accumulators and registers, the size of on-chip and external memories, the size of communication buffers, and inter-processor communications. The algorithm implicitly retimes and pipelines the flow graph and generates overlapping PSSIMD schedules that are both rate and processor optimal. When compared to previously published scheduling algorithms, the DSMP-C1 algorithm produces significantly shorter iteration periods.< >

关键词： Optimal scheduling scheduling algorithm Processor scheduling Signal processing algorithms Signal processing Digital signal processors Digital signal processing Registers Pipelines Flow graphs

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Packet scheduling and resource allocation for video transmission over downlink OFDMA networks

Packet scheduling and resource allocation for video transmis...

引用

International Conference on Communications and Networking in China (CHINACOM)

作者： Fan Li Guizhong Liu Jin Xu Lijun He School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781424443369

This paper investigates the problem of multiuser packet scheduling and resource allocation for video transmission over downlink OFDMA networks. A cross-layer optimization function is proposed with the goal to maximize the received video quality. Unlike the previous methods in which the objective function is estimated the video quality in the unit of bit, the proposed algorithm develop the objective function in unit of packet, which is more fit for video transmission. In order to solve the optimization problem in a low complexity, a suboptimal algorithm for packet scheduling and resource allocation is proposed. The algorithm is compatible with the emerging wireless standards, such as IEEE 802.16. The simulation results show that the proposed algorithm outperforms the previous resource allocation schemes in terms of received video qualities.

关键词： scheduling algorithm Resource management Downlink Streaming media Cross layer design Decoding Switches Frequency conversion Physical layer Media Access Protocol

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Optimal Sleep-Wake scheduling for Quickest Intrusion Detection Using Wireless Sensor Networks

Optimal Sleep-Wake Scheduling for Quickest Intrusion Detecti...

引用

IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： K. Premkumar A. Kumar Department of Electrical Communication Engineering (ECE) Indian Institute of Science Bangalore India

We consider the problem of quickest detection of an intrusion using a sensor network, keeping only a minimal number of sensors active . By using a minimal number of sensor devices, we ensure that the energy expenditure for sensin g, computation and communication is minimized (and the lifetime of the network is maximized). We model the intrusion detection (or change detection) problem as a Markov decision process (MDP). Based on the theory of MDP, we develop the following closed loop sleep/wake scheduling algorithms: (1) optimal control of M k+1 , the number of sensors in the wake state in time slot k + 1, (2) optimal control of q k+1 , the probability of a sensor in the wake state in time slot k + 1, and an open loop sleep/wake scheduling algorithm which (3) computes q, the optimal probability of a sensor in the wake state (which does not vary with time), based on the sensor observations obtained until time slot k. Our results show that an optimum closed loop control on M k+1 significantly decreases the cost compared to keeping any number of sensors active all the time. Also, among the three algorithms described, we observe that the total cost is minimum for the optimum control on M k+1 and is maximum for the optimum open loop control on q.

关键词： Intrusion detection Wireless sensor networks Intelligent sensors Sensor fusion scheduling algorithm Open loop systems Testing Optimal control Cost function Sleep

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Dispatching rules for production scheduling: A hyper-heuristic landscape analysis

Dispatching rules for production scheduling: A hyper-heurist...

引用

Congress on Evolutionary Computation

作者： Gabriela Ochoa Jose Antonio Vazquez-Rodriguez Sanja Petrovic Edmund Burke School of Computer Science and Information Technology University of Nottingham Nottingham UK

Hyper-heuristics or ldquoheuristics to chose heuristicsrdquo are an emergent search methodology that seeks to automate the process of selecting or combining simpler heuristics in order to solve hard computational search problems. The distinguishing feature of hyper-heuristics, as compared to other heuristic search algorithms, is that they operate on a search space of heuristics rather than directly on the search space of solutions to the underlying problem. Therefore, a detailed understanding of the properties of these heuristic search spaces is of utmost importance for understanding the behaviour and improving the design of hyper-heuristic methods. Heuristics search spaces can be studied using the metaphor of fitness landscapes. This paper formalises the notion of hyper-heuristic landscapes and performs a landscape analysis of the heuristic search space induced by a dispatching-rule-based hyper-heuristic for production scheduling. The studied hyper-heuristic spaces are found to be ldquoeasyrdquo to search. They also exhibit some special features such as positional bias and neutrality. It is argued that search methods that exploit these features may enhance the performance of hyper-heuristics.

关键词： Dispatching Production Space technology Processor scheduling Search problems Heuristic algorithms Design methodology Search methods scheduling algorithm Performance analysis

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Simultaneous multiple-V/sub dd/ scheduling and allocation for partitioned floorplan

Simultaneous multiple-V/sub dd/ scheduling and allocation fo...

引用

IEEE International Symposium on Quality Electronic Design

作者： D. Kang M.C. Johnson K. Roy School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

In this paper we propose a simultaneous scheduling and allocation algorithm for voltage-partitioned multiple-V/sub dd/ design. By considering voltage partition during scheduling and allocation, we may place the resources of same voltage in one partition, thereby reducing additional power meshes. Also, the partitioned design reduces the energy dissipation of level converters by reducing cutsize between different-voltage partitions. The proposed algorithm starts from a random solution. Then, it performs scheduling and allocation simultaneously while trying to satisfy both resource and time constraints. By gradually changing the schedule and allocation, the algorithm effectively explores solution spaces to achieve low-power and better partitioning in terms of the supply voltages. Relative to the minimum single voltage design, 36% of energy saving was achieved. Also, improvements for interconnect, level-conversion energy, and voltage clusters were observed.

关键词： Voltage Processor scheduling Energy dissipation Circuits Clocks Partitioning algorithms scheduling algorithm Time factors Throughput Resource management

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Work Stealing Technique and scheduling on the Critical Path

Work Stealing Technique and Scheduling on the Critical Path

引用

International Conference on Grid and Pervasive Computing Workshops, GPC

作者： Christophe Cérin Michel Koskas Laboratoire d'Informatique de Paris-Nord Villetaneuse France Mathématiques et Informatique Appliquées AgroParisTech/INRA UMR 518 Paris France

This paper is about a new framework for high performance thread scheduling based on the work stealing principle when processors may run at different speed. We also take into account memory management problems. We hope that such framework could help multi-threaded or multi-core architects to rely on well founded mathematical results to build appropriate hardware/software schedulers that control the scheduling of threads.

关键词： Yarn Processor scheduling Memory management Hardware scheduling algorithm Parallel processing Concurrent computing Pervasive computing Parallel programming Clustering algorithms

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scheduling sporadic tasks with shared resources in hard-real-time systems

Scheduling sporadic tasks with shared resources in hard-real...

引用

Real-Time Systems Symposium (RTSS)

作者： K. Jeffay Department of Computer Science University of North Carolina Chapel Hill Chapel Hill NC USA

The problem of scheduling a set of sporadic tasks that share a set of serially reusable, single unit software resources on a single processor is considered. The correctness conditions are that: each invocation of each task completes execution at or before a well-defined deadline; and a resource is never accessed by more than one task simultaneously. An optimal online algorithm for scheduling a set of sporadic tasks is presented. The algorithm results from the integration of a synchronization scheme for access to shared resources with the earliest deadline first algorithm. A set of relations on task parameters that are necessary and sufficient for a set of tasks to be schedulable is also derived. The proposed model for the analysis of processor scheduling policies is novel in that it incorporates minimum as well as maximum processing time requirements of tasks. The scheduling algorithm and the sporadic tasking model have been incorporated into an operating system kernel and used to implement several real-time systems.< >

关键词： Processor scheduling scheduling algorithm Software reusability Operating systems Monitoring Computer science Real time systems Data structures Computer languages Resource management

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False path and clock scheduling based yield-aware gate sizing

False path and clock scheduling based yield-aware gate sizin...

引用

International Conference on VLSI Design

作者： Jeng-Liang Tsai Dong Hyun Baik C. Chung-Ping Chen K.K. Saluja Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI USA Graduate Institute of Electronics Engineering & Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)0769522645

Timing margin (slack) needs to be carefully managed to ensure a satisfactory timing yield. We propose a new design flow that combines a false-path-aware gate sizing and a statistical-timing-driven clock scheduling algorithms to maximize timing yield. Our gate sizing algorithm preserves the true path lengths that may otherwise be altered by the traditional gate sizing algorithms due to the presence of false paths. The slack is then distributed to each path according to its path delay uncertainty to maximize the timing yield. Experimental results show that our flow achieves significant timing yield improvements (> 20%) than a traditional flow for a subset of the benchmark circuits with little or negligible area penalty.

关键词： Clocks Timing scheduling algorithm Delay Job shop scheduling Sequential circuits algorithm design and analysis Processor scheduling Drives Engineering management

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A novel model of large-scale hydrothermal power system optimal scheduling

A novel model of large-scale hydrothermal power system optim...

引用

IEEE PES Power Systems Conference and Exposition, PSCE

作者： Zhen Wang GuangYu He XueQing Chen ShuangXi Zhou Tsinghua University Beijing China

ISBN: (纸本)078038718X

This work presents a new application of linear programming with multiembedded blocks [LPMEB] for optimal scheduling of multilevel interconnected hydrothermal power system. The multiembedded structure is suitable for the multilevel power system operation and the autonomy and confidentiality of each embedded system are maximized while assuring the global economy to the whole system. In this model, each block is a local linear programming [LP] model, or network flow programming [NP] model with side constraints, or their combinations, and it can be embeddable. The hydropart is linear model with the fixed-head hydroplant model. A direct method based on the revised simplex algorithm is proposed to resolve the LPMEB problem, and can be implemented via applied distributed computing technique. Numerical results for the interconnected hydrothermal power system of three gorges, China, are presented.

关键词： Power system modeling Large-scale systems Optimal scheduling Power system interconnection Linear programming AC generators Power generation Costs Distributed computing scheduling algorithm

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