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A scheduling scheme WITH DYNAMIC FREQUENCY CLOCKING AND MULTIPLE VOLTAGES FOR LOW POWER DESIGNS

Journal of Electronics(China) 2007年第4期24卷 572-576页

作者： Wen Dongxin Wang Ling Yang Xiaozong Department of Computer Science an-d Technology -I-Iarb（n Institute of Technology Harbin 150001 China

In this letter, a scheduling scheme based on Dynamic Frequency Clocking (DFC) and multiple voltages is proposed for low power designs under the timing and the resource constraints. Unlike the conventional methods at high level synthesis where only voltages of nodes were considered, the scheme based on a gain function considers both voltage and frequency simultaneously to reduce energy consumption. Experiments with a number of DSP benchmarks show that the proposed scheme achieves an effective energy reduction.

关键词： scheduling scheme Dynamic Frequency Clocking (DFC) Multiple voltages High level synthesis

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OpenMP-based parallel transient stability simulation for large-scale power systems

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Science China(Technological Sciences) 2012年第10期55卷 2837-2846页

作者： JIANG QuanYuan JIANG Han College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

This paper provides an OpenMP-based parallel Very Dishonest Newton(VDHN) algorithm with variable step size,running transient stability simulations(TSA) on multi-core *** the framework of simultaneous solution method of TSA,the step-size control strategy is used according to the local truncation error theory ***,computation of the generation units,which is the most time-consuming part of the simulation,is dynamically dispatched to several cores using an α dynamic scheduling scheme to obtain workload balancing based on *** to the convergence of Newton-type iterations,an adaptive Jacobian update control strategy is applied to reduce the sequential part of the simulation and the overhead generated by *** large scale test cases verify the validity and practicability of the proposed parallel algorithm,showing that the proposed approach achieves high speed-up and a considerable reduction in parallel overheads.

关键词： transient stability parallel compute OpenMP Very Dishonest Newton(VDHN) step-size control scheduling scheme adaptive Jacobian update control

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Automatic Driving Material Handling Vehicle Station Location and scheduling Mathematical Modeling and Analysis

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Journal of Applied Mathematics and Physics 2023年第9期11卷 2630-2643页

作者： Qi Zhang Qiaozhen Zhang School of Mathematical Sciences Nankai University Tianjin China The Key Laboratory of Pure Mathematics and Combinatorics Ministry of Education Key Laboratory for Medical Data Analysis and Statistical Research of Tianjin Laboratory for Economic Behaviors and Policy Simulation School of Statistics and Data Science Nankai University Tianjin China

Traditional material handling vehicles often use internal combustion engines as their power source, which results in exhaust emissions that pollute the environment. In contrast, automated material handling vehicles have the advantages of zero emissions, low noise, and low vibration, thus avoiding exhaust pollution and providing a more comfortable working environment for operators. In order to achieve the goals of “peaking carbon emissions by 2030 and achieving carbon neutrality by 2060”, the use of environmentally friendly autonomous material handling vehicles for material transportation is an inevitable trend. To maximize the amount of transported materials, consider peak-to-valley electricity pricing, battery pack procurement, and the construction of charging and swapping stations while achieving “minimum daily transportation volume” and “lowest investment and operational cost over a 3-year settlement period” with the shortest overall travel distance for all material handling vehicles, this paper examines two different scenarios and establishes goal programming models. The appropriate locations for material handling vehicle swapping stations and vehicle battery pack scheduling schemes are then developed using the NSGA-II algorithm and ant colony optimization algorithm. The results show that, while ensuring a daily transportation volume of no less than 300 vehicles, the lowest investment and operational cost over a 3-year settlement period is approximately 24.1 million Yuan. The material handling vehicles follow the shortest path of 119.2653 km passing through the designated retrieval points and have two shortest routes. Furthermore, the advantages and disadvantages of the proposed models are analyzed, followed by an evaluation, deepening, and potential extension of the models. Finally, future research directions in this field are suggested.

关键词： Electric Material Handling Vehicles Battery Swap Station Location scheduling scheme NSGA-II Algorithm Ant Colony Optimization Algorithm

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