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

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A New Multi-Criteria Mechatronic Design Methodology Using Niching Genetic Algorithm

A New Multi-Criteria Mechatronic Design Methodology Using Ni...

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congress on Evolutionary computation

作者： S. Behbahani C.W. de Silva Mechanical Engineering Department University of British Columbia (UBC) Vancouver BC Canada

Due to the presence of a wide range of interactive criteria involved in a mechatronic system, a system-based design methodology is needed to achieve optimum mechatronic design. Mechatronic Design Quotient (MDQ) is employed as a multi-criteria design evaluation index in order to develop a concurrent and system-based design approach. MDQ is a multi-criteria index reflecting the global sense of design satisfaction, which is computed by a nonlinear fuzzy integral for aggregation of different criteria. It can be used for the purposes of optimization and/or decision making in different stages of design. In this paper, it serves to evaluate the fitness of design trials in an optimization process. Optimization process is performed in two stages because comprehensive MDQ evaluation of each design trial is time consuming. In the first stage, niching genetic algorithm is used to find local and global optimal design alternatives with respect to some essential MDQ attributes. In the second stage, these local optima will compete with each other, with respect to all criteria involved in MDQ. The developed design methodology offers a concurrent, integrated, and multi-criteria approach, which will provide a mechatronic design that is optimal with respect to the design criteria included in the MDQ. The performance of the developed methodology is validated by applying it to the design of the motion system of an industrial fish cutting machine called Iron Butcher an electromechanical system which falls into the class of mixed or multi-domain.

关键词： Mechatronics Design methodology Genetic algorithms Design optimization Decision making Performance evaluation Algorithm design and analysis Metals industry Marine animals Iron

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A PSO-based Mobile Sensor Network for Odor Source Localization in Dynamic Environment: Theory, Simulation and Measurement

A PSO-based Mobile Sensor Network for Odor Source Localizati...

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congress on Evolutionary computation

作者： W. Jatmiko K. Sekiyama T. Fukuda Department of Micro-Nano Systems Engineering University of Nagoya Japan

This paper presents a problem of odor source localization in a dynamic environment, which means the odor distribution is changing over time. Most work on chemical sensing with mobile robots assume an experimental setup that minimizes the influence of turbulent transport by either minimizing the source-to-sensor distance in trail following or by assuming a strong unidirectional air stream in the environment, including our previous work. However, not much attention has been paid to the natural environment problem. Modification Particle Swarm Optimization is a well-known algorithm, which can continuously track a changing optimum over time. PSO can be improved or adapted by incorporating the change detection and responding mechanisms for solving dynamic problems. Charged PSO, which is another extension of the PSO, has also been applied to solve dynamic problems. Odor source localization is an interesting application in dynamic problems. We will adopt two types of PSO modification concepts to develop a new algorithm in order to control autonomous vehicles. Before applying the algorithm for real implementation, some important hardware conditions must be considered. Firstly, to reduce the possibility of robots leaving the search space, a limit to the value of velocity vector is needed. The value of vector velocity can be clamped to the range [-V max , V max ]; in our case for the MK-01 Robot, the maximum velocity is 0.05 m/s. Secondly, in the standard PSO algorithm there is no collision avoidance mechanism. To avoid the collision among robot we add some collision avoidance functions. Finally, we also add some sensor noise, delay and threshold value to model the sensor response. Then we develop odor localization algorithm, and simulations to show that the new approach can solve such dynamic environment problems.

关键词： Vehicle dynamics Mobile robots Change detection algorithms Orbital robotics Robot sensing systems Collision avoidance Chemical sensors Particle swarm optimization Particle tracking Remotely operated vehicles

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A Path computation algorithm in MPLS Traffic engineering for reducing blocking probability

A Path Computation algorithm in MPLS Traffic Engineering for...

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The 19th international Teletraffic congress-ITC19

作者： Shahram Mohrehkesh Saleh Yousefi Mahmoud Fathy Faculty of Computer Engineering Iran University of Science and Technology (IUST) Farjam St. Tehran Iran Faculty of Computer Engineering Iran University of Science and Technology (IUST) Farjam St. Tehran Iran Faculty of Computer Engineering Iran University of Science and Technology (IUST) Farjam St. Tehran Iran

In this paper a new path computation algorithm in Traffic engineering in MPLS networks for reducing blocking probability of requests is proposed which is an improvement of TE-DB algorithm. The TE-DB is one of best path computation algorithm which is proposed in literatures. The Algorithm deploys multiple path routing and distributes the load more balanced n network. In addition, it reduces the blocking probability of requests. Reducing probability of blocking and distributing load are two important objectives in Traffic engineering which TEDM improves these two parameters. Four heuristic algorithms are proposed for distributing load among multiple paths. The algorithms are simulated by MATLAB. The results show that TEDBM reduces the blocking probability about 50% in average and distributes the load more balanced than the TE-DB algorithm. Hence, the network utilization is also increased.

关键词： Traffic engineering, QoS, Bandwidth, Delay.

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Battery-Aware Routing in Wireless Ad Hoc Networks - Part I: Energy Model

Battery-Aware Routing in Wireless Ad Hoc Networks - Part I: ...

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The 19th international Teletraffic congress-ITC19

作者： Yuanyuan Yang and Chi Ma Department of Electrical and Computer engineering State University of New York at Stony Brook, Stony Brook, NY 11790 Department of Computer Science State University of New York at Stony Brook, Stony Brook, NY 11790

A key challenge in wireless ad hoc networks is to achieve maximum lifetime for battery-powered mobile devices with dynamic energy efficient algorithms. Recent study in battery technology reveals that the behavior of battery discharging is more complex than we used to think. Battery powered devices might waste a huge amount of energy if we do not carefully schedule and budget their discharging. In this paper, we introduce a novel energy model for batteries and study the effect of battery behavior on routing in wireless ad hoc networks. Based on this model, we also propose a battery-aware routing protocol. The paper consists of two parts. In Part I of the paper, we propose an on-line computable discrete time analytical model to mathematically model battery discharging behavior. The model has low computational complexity and does not require large look-up tables. It is suitable for on-line battery capacity computation in ad hoc network routing. We use the data collected from actual nickel-cadmium battery to evaluate the performance of our model and the results show that it can accurately capture the behavior of battery discharging. In Part II of the paper [1], a battery-aware routing protocol (BAR) is proposed based on the new battery model. By dynamically choosing the nodes with well recovered batteries as routers, and leaving the "fatigue" nodes for recovery, the BAR protocol can effectively recover the node's battery capacity and achieve higher energy efficiency. Our simulation results show that the BAR protocol can increase network lifetime and total data throughput by up to 28% and 24%, respectively, compared with previous routing protocols. As far as we know, this is the first work considering battery-awareness with an accurate on-line computable battery model in ad hoc network routing. We believe our battery model can be used to explore other energy efficient schemes for wireless networks as well.

关键词： Wireless ad hoc networks, energy efficiency, battery models, battery-awareness, routing protocols.

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Parallel computation of a mixed convection problem using fully-coupled and segregated algorithms

Parallel computation of a mixed convection problem using ful...

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2004 ASME international Mechanical engineering congress and Exposition, IMECE

作者： Darbandi, Masoud Banaeizadeh, Araz Schneider, Gerry E. Department of Aerospace Engineering Sharif University of Technology Tehran P.O. Box 11365-8639 Iran Department of Mechanical Engineering University of Waterloo Waterloo Ont. N2L 3G1 Canada

In this work, parallel solution of the Navier-Stokes equations for a mixed convection heat problem is achieved using a finite-element-based finite-volume method in fully coupled and semi coupled algorithms. A major drawback with the implicit methods is the need for solving the huge set of linear algebraic equations in large scale problems. The current parallel computation is developed on distributed memory machines. The matrix decomposition and solution are carried out using PETSc library. In the fully coupled algorithm, there is a 36-diagonal global matrix for the two-dimensional governing equations. In order to reduce the computational time, the matrix is suitably broken in several sub-matrices and they are subsequently solved in a segregated manner. This approach results in four 9-diagonal matrices. Different sparse solver algorithms are utilized to solve a mixed natural-forced convection problem using either fully-coupled or semi-coupled algorithms. The performance of the solvers are then investigated in solving on a distributed computing environment. The study shows that the iteration run time considerably decreases although the overall run time of the fully coupled algorithm still looks better. Copyright © 2004 by ASME.

关键词： Heat convection

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Evolutionary fuzzy real-time job-shop scheduling

Evolutionary fuzzy real-time job-shop scheduling

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Image Processing, Biomedicine, Multimedia, Financial engineering and Manufacturing - international Forum on Multimedia Image Processing, IFMIP - Sixth Biannual World Automation congress, WAC 2004

作者： Hosseini-Rostami, S.M. Akbarzadeh-T., M.R. Sadati-Rostami, S.-J. Department of Electrical Engineering Ferdowsi University of Mashhad Mashhad Iran

ISBN: (纸本)188933524X

Real time task scheduling can be a challenging problem because of inherent system uncertainties such as task importance, timing and computation time, and particularly when the system is under overload, i.e. it is given more tasks than it can possibly complete in the allotted time span. To alleviate these problems, we first propose a novel fuzzy scheduling approach in which the real time scheduling is treated as a multi-criteria optimization problem. Consequently, genetic algorithms are applied to optimize membership functions of the resulting fuzzy systems. Simulation results indicate that the proposed fuzzy scheduler increases both the total number of executed tasks as well as number important tasks that are completed, when compared with the bench mark approach. Application of genetic algorithms to membership function optimization further improves these results.

关键词： Scheduling

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Study of semiactive adaptive control algorithms with magneto-rheological seat suspension

Study of semiactive adaptive control algorithms with magneto...

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2004 SAE World congress

作者： Song, Xubin Ahmadian, Mehdi Visteon Corp. United States Advanced Vehicle Dynamics Laboratory Department of Mechanical Engineering Virginia Tech United States

ISBN: (纸本)0768013194

This paper presents a parametric study of two semiactive adaptive control algorithms through simulation: the non-model based skyhook control, and the newly developed model-based nonlinear adaptive vibration control. This study includes discussion of suspension model setup, dynamic analysis approach, and controller tuning. The simulation setup is from a heavy-duty truck seat suspension with a magneto-rheological (MR) damper. The dynamic analysis is performed in the time domain using sine sweep excitations without the need to linearize such a nonlinear semiactive system that is studied here. Through simulation, the effectiveness of both control algorithms is demonstrated for vibration isolation. The computation flops of the simulation in the SIMULINK environment are compared, and the adaptability is studied with respect to plant variations and different excitation profiles, both of which come across typically for vehicle suspension systems. The comparison shows that a new control approach is necessary that can take advantage of both studied control algorithms for industrial commercialization. Copyright © 2004 SAE international.

关键词： Time domain analysis

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A "hands-on" approach to teaching undergraduate heat transfer

A "hands-on" approach to teaching undergraduate heat transfe...

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2004 ASME international Mechanical engineering congress and Exposition, IMECE 2004

作者： Ribando, Robert J. Richards, Larry G. O'Leary, Gerald W. Mechanical and Aerospace Engineering University of Virginia Charlottesville VA 22904-4746 United States

ISBN: (纸本)0791847233

Over the last eight years we have converted our undergraduate heat transfer course from a traditional lecture-based format to a "hands-on" environment taught in a room equipped with a computer for each pair of students. For nearly each major topic covered in this third-year survey course we have developed either a "canned" module or a student-implemented project illustrating that topic. The modules are written in Visual Basic and are graphically rich and highly interactive, while modem, research-based algorithms run behind the scenes. Many of these nine modules grew out of demonstrations and student projects developed for use in graduate level courses taught through our outreach program, which for many years has provided a highly supportive environment for instructional innovation. In addition, the student clientele, working engineers who already know and use computation and visualization extensively in their own careers, provides ample incentive for curriculum modernization. Copyright © 2004 by ASME.

关键词： Heat transfer

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Efficient algorithms for handling Molecular Weighted Sequences

Efficient algorithms for handling Molecular Weighted Sequenc...

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IFIP 18th World Computer congress, TC1 and 3rd international Conference on Theoretical Computer Science, TCS 2004

作者： Iliopoulos, Costas S. Makris, Christos Panagis, Yannis Perdikuri, Katerina Theodoridis, Evangelos Tsakalidis, Athanasios Department of Computer Science King's College London Strand London WC2R2LS United Kingdom Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece Research Academic Computer Technology Institute 61 Riga Feraiou Str. 26221 Patras Greece

ISBN: (纸本)1402081405

In this paper we introduce the Weighted Suffix Tree, an efficient data structure for computing string regularities in weighted sequences of molecular data. Molecular Weighted Sequences can model important biological processes such as the DNA Assembly Process or the DNA-Protein Binding Process. Thus pattern matching or identification of repeated patterns, in biological weighted sequences is a very important procedure in the translation of gene expression and regulation. We present time and space efficient algorithms for constructing the weighted suffix tree and some applications of the proposed data structure to problems taken from the Molecular Biology area such as pattern matching, repeats discovery, discovery of the longest common subsequence of two weighted sequences and computation of covers. © 2004 Springer Science + Business Media, Inc.

关键词： Pattern matching

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Based on stereo sequence image 3-D motion parameters determination 20

Based on stereo sequence image 3-D motion parameters determi...

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20th ISPRS congress Technical Commission V

作者： Zhang, Chunsen Zhang, Jianqing He, Shaojun School of Remote Sensing and Information Engineering Wuhan University China

Deriving accurate 3-D motion information of a scene is an essential and important task in computer vision, and is also one of the most difficult problems. In this paper, using photogrammetry method and computer vision technique the author investigates the determination of 3-D motion parameters from binocular stereo image sequences method and steps. Discussing the in-situ calibration for binocular stereo computer vision systems, combining correlation coefficients and relaxation method for performing motion and binocular stereo matching of images based on point feature, 3-D feature points in the motion object correspondences before and after motion, using "Skew-Symmetric Matrix Decomposition (SSMD)" algorithms which exploits the fewest variables and without losing the linearity in computation to reduce computing complexity and improve accuracy about motion parameters R and T acquirement etc. Finally, the motion parameters of real data based on 3-D correspondences feature estimation method are given. © 2014 ISPRS. All Rights Reserved.

关键词： Calibration

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