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检索条件"任意字段=2016 International Congress on Computation Algorithms in Engineering"

共 1728 条记录，以下是31-40 订阅

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A comparison of probabilistic-based optimization approaches for vehicle routing problems

A comparison of probabilistic-based optimization approaches ...

引用

IEEE congress on Evolutionary computation (CEC)

作者： Santana, Roberto Sirbiladze, Gia Ghvaberidze, Bezhan Matsaberidze, Bidzina Univ Basque Country San Sebastian Spain Tbilisi State Univ Tbilisi Georgia

ISBN: (纸本)9781509046010

Estimation of distribution algorithms (EDAs) are evolutionary algorithms that use probabilistic modeling to lead a more efficient search for optimal solutions. While EDAs have been applied to several types of optimization problems, they exhibit some limitations to deal with constrained optimization problems. More study and understanding of how can EDAs deal with these problems is required. In this paper we investigate the application of EDAs to a version of the vehicle routing problem in which solutions should satisfy a number of constraints involving the customers, the fleet vehicle, and the items to be delivered. For this problem, we compare two different representations of the solutions, and apply EDAs that use three probabilistic models with different characteristics. Our results show that the combination of an integer representation with tree-based probabilistic model produces the best results and is able to solve vehicle routing problems that contain over thousands of promising paths.

关键词： Probabilistic logic Indexes Vehicle routing Evolutionary computation Optimization Maintenance engineering Search problems

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A study of hardware implementations of the CRC computation algorithms 4

A study of hardware implementations of the CRC computation a...

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4th Russian Forum for Young Scientists with international Participation on Space engineering

作者： Mytsko, Evgeniy Malchukov, Andrey Ryzova, Svetlana Kim, Valeriy Natl Res Tomsk Polytechn Univ Tomsk 634050 Russia

The paper is about hardware implementations of the CRC computation algorithms. Combinational circuits of CRC8 and CRC32 computation devices, which can be embedded in satellites for error checking in configuration memory and data transmission module, were considered. The conclusion about the advantages of matrix-driven algorithm hardware implementation, which are a simple diagram is built using only logic << exclusive OR >> was done. The examples of CRC8 and CRC32 devices working were presented according to parametric model with different input data.

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Dynamic autonomous control for future space science missions

Dynamic autonomous control for future space science missions

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59th international Astronautical congress 2008, IAC 2008

作者： Brown, Blair McInnes, Colin Department of Mechanical Engineering University of Strathclyde Glasgow United Kingdom

ISBN: (纸本)9781615671601

The drive toward reducing the size and mass of spacecraft has put new constraints on the computation available for control and decision making algorithms. The aim of this paper is to present an alternative method for decision making algorithms that can be introduced to smaller Micro(10-100kg) or Nano(1-10kg) spacecraft. The ideas behind this work come from dynamical systems theory. Systems of differential equations can be built to define behaviors which can be manipulated to define an action selection algorithm. These algorithms can be mathematically validated and shown to be computationally efficient.

关键词： Differential equations

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Evolutionary Algorithm for Project Scheduling under Irregular Resource Changes

Evolutionary Algorithm for Project Scheduling under Irregula...

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IEEE congress on Evolutionary computation (IEEE CEC)

作者： Zaman, Forhad Elsayed, Saber Sarker, Ruhul Essam, Daryl Coello Coello, Carlos A. Univ New South Wales Sch Engn & Informat Technol Canberra ACT Australia UAM Azcapotzalco Dept Sistemas Mexico City DF Mexico

ISBN: (纸本)9781728121536

Over the last few decades, project scheduling problems have been solved under a set of resource constraints, which are assumed fixed throughout the project horizon. However, in real-life applications, resources may change over time due to maintenance or because the resources are needed for another project. Therefore, this research introduces a hybrid evolutionary framework, based on two multi-operator evolutionary algorithms, and a heuristic technique, for a multi-mode project scheduling under irregular resources changes. The framework simultaneously considers both algorithms and self-adaptively emphasizes the one which performs comparatively better. The heuristic considers two variants of handling techniques for irregular resources. One is based on inserting buffer activities to characterize resources unavailable, and another is based on a modified serial generation scheme, that determines the best modes of the activities at each time period based on irregular resources. The framework is tested by solving a set of test problems, with the renewable resources considered irregular over the project horizon. The results demonstrate that the multi-method algorithm has some advantages for scheduling a project, under both regular and irregular resources.

关键词： Schedules Scheduling Maintenance engineering Heuristic algorithms Evolutionary computation Linear programming Optimization

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RECTILINEAR PATHS AMONG RECTILINEAR OBSTACLES 3rd

RECTILINEAR PATHS AMONG RECTILINEAR OBSTACLES

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3RD international SYMP ON algorithms AND computation ( ISAAC 92 )

作者： LEE, DT Department of Electrical Engineering and Computer Science Northwestern University Evanston 60208 IL United States

ISBN: (纸本)3540562796

Given a set of obstacles and two distinguished points in the plane the problem of finding a collision-free path subject to a certain optimization function is a fundamental problem that arises in many fields, such as motion planning in robotics, wire routing in VLSI and logistics in operations research. In this survey we emphasize its applications to VLSI design and limit ourselves to the rectilinear domain in which the goal path to be computed and the underlying obstacles axe all rectilinearly oriented, i.e., the segments are either horizontal or vertical. We consider different routing environments, and various optimization criteria pertaining to VLSI design, and provide a survey of results that have been developed in the past, present current results and give open problems for future research. © Springer-Verlag Berlin Heidelberg 1992.

关键词： Surveys

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Investigation of Screening Filter Methods to Enhance computation Speed of Conjunction Assessment Analysis

Investigation of Screening Filter Methods to Enhance Computa...

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2022 international Electrical engineering congress, iEECON 2022

作者： Saingyen, Phasawee Puttasuwan, Keerati Channumsin, Sittiporn Sreesawet, Suwat Udomthanatheera, Prakasit Limna, Thanathip Prince of Songkla University Faculty of Engineer Department of Computer Engineering Songkla90110 Thailand Chonburi20230 Thailand

ISBN: (纸本)9781665402064

The collision events in space result in generating a large number of fragmentation debris in orbit that threats to active satellites or spacecraft in near future. Currently, the space traffic management system analyzes the conjunction assessment to evaluate the collision risk of satellite by defining the time closest approach (TCA) and miss distance between two space objects to decide the collision avoidance maneuver plan of satellite when there is a high chance of collision. However, the computation time of conjunction analysis is the key to decide the collision maneuver plan to mitigate the collision risks because the conjunction analysis assessment algorithm without a filter spend huge runtime to detect the TCA of all space objects. In order to enhance the computation speed, the conjunction filter algorithms are very useful for finding the conjunction events of some objects before computing the precise TCA and miss distance. The timestep analysis is one of the keys to increase the computation speed. However, the filter possible miss some conjunction events. This paper presents the investigations of two conjunction filter methods: "Smart Sieve"and "CSieve"to define the conjunction events of three Thai satellites: THEOS, NAPA-1 and NAPA-2 by varying the timestep of both filters. The analyzed results (computation cost, number of conjunction events) are compared with the conjunction assessment analysis without filter. © 2022 IEEE.

关键词： Satellites

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Analysis of Algorithm Comparison Results on Real-World Multi-Objective Problems 13

Analysis of Algorithm Comparison Results on Real-World Multi...

引用

13th IEEE congress on Evolutionary computation, CEC 2024

作者： Pang, Lie Meng Ishibuchi, Hisao Shang, Ke Southern University of Science and Technology Guangdong Provincial Key Laboratory of Brain-inspired Intelligent Computation Department of Computer Science and Engineering Shenzhen518055 China

ISBN: (纸本)9798350308365

Recently, several real-world multi-objective optimization problem suites have been proposed to facilitate the evaluation of the performance of evolutionary multi-objective optimization (EMO) algorithms. In spite of the importance of using real-world problems to evaluate EMO algorithms, their characteristics are not well understood compared to artificial test problems. Thus, there is a need to examine and understand the challenges posed by these real-world problems. In this study, we attempt to explore the characteristics of the most recently proposed real-world application suite (i.e., RWA suite). Six EMO algorithms are evaluated on the RWA suite, including three classic algorithms and three recently-proposed algorithms. Based on the performance comparison results, we systematically analyze the RWA suite in terms of convergence and diversity difficulties. © 2024 IEEE.

关键词： Optimization algorithms

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NONLINEAR ADAPTIVE CONTROL OF DYNAMIC SYSTEMS DRIVEN BY SHAPE MEMORY ALLOY (SMA) ACTUATORS

引用

ASME international Mechanical engineering congress and Exposition

作者： Chen, Shuo Craft, William J. Song, David Y. N Carolina Agr & Tech State Univ Dept Mech Engn Greensboro NC 27411 USA

ISBN: (纸本)9780791848722

This work describes the development and analysis of nonlinear adaptive based control algorithms for composite structures/systems operated with Shape Memory Alloy (SMA) actuators. A mathematical model charactering the motion of the composite systems is established, and by using Lyapunov stability theory, algorithms for linear displacement tracking control are derived. Actuation and control is achieved by adjusting the supply current to the SMA actuators. It is shown that with the proposed strategy for both linear displacement and velocity requires that the desired trajectory is tracked precisely. The novelty of the proposed approach also lies in the fact that it is fairly easy to set up and the computation involved as compared with other strategies. An example is used to verify the validity of the proposed approach. Simulation results using Matlab are presented.

关键词： Control algorithms Matlab algorithms Simulation results Trajectories (Physics) Displacement Adaptive control Shape memory alloys Composite materials Tracking control Dynamic systems computation Stability Actuators

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A Distributed Graph Partitioning Algorithm for Processing Large Graphs

A Distributed Graph Partitioning Algorithm for Processing La...

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10th IEEE international Symposium on Service-Oriented System engineering (IEEE SOSE)

作者： Chen, Tefeng Li, Bo Beihang Univ Sch Comp Sci & Engn Beijing Peoples R China

ISBN: (纸本)9781509022533

To address the challenge of processing large-scale graphs, researchers have paid much attention to distributed approaches. The quality of graph partitioning plays a key role in the performance of distributed algorithms, in respect of workload balance and communication cost. However, few of existing graph partitioning algorithms are capable of partitioning large graphs on distributed memory systems. In this paper, we propose a distributed balanced graph partitioning algorithm that is suitable for general distributed graph computation frameworks, called BS (Bulk Swap), which is based on a scatter-gather local search scheme and the simulated annealing technique. BS takes the advantage of the BSP graph computation model which can process bulk data efficiently. Experimental analysis shows BS can produce good partitions with high efficiency on both real-world and synthetic graphs.

关键词： distributed algorithm graph partitioning local search synchronous computation simulated annealing

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VARIOUS APPROACHES TO NUMERICAL DISCRETIZATION OF THERMAL MODEL WITH PHASE CHANGE

VARIOUS APPROACHES TO NUMERICAL DISCRETIZATION OF THERMAL MO...

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ASME international Mechanical engineering congress and Exposition (IMECE2015)

作者： Mauder, Tomas Klimes, Lubomir Charvat, Pavel Stetina, Josef Brno Univ Technol Brno Czech Republic

ISBN: (纸本)9780791857502

Phase change materials are nowadays used in a wide range of technical applications such as energy storage, building temperature comfort, food-freezing, etc. The accurate modelling of this process is important for the performance and usability of many technologies. Analytical solutions can be used only for simple heat transfer problems which make the numerical methods the only possible way how to deal with complex multidimensional cases. This paper deals with the comparison of commonly used numerical schemes for heat diffusion with phase change and its parallel computation possibilities.

关键词： Temperature Freezing Heat transfer Phase change materials Energy storage Modeling Numerical analysis computation Food products Thermal diffusion

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