检索结果-内蒙古大学图书馆

Joint Meeting of the International Symposium on Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging (NFSI-ICFBI)

作者： Roland Eichardt Jens Haueisen Thomas R. Knosche Ernst G. Schukat-Talamazzini Institute of Biomedical Engineering and Informatics Technical University Ilmenau Germany Max Planck Institute for Human Cognitive and Brain Sciences Germany Institute of Practical Computer Science Friedrich-Schiller-Universitat Jena Germany

The localization of dipolar sources in the brain based on EEG or MEG data is a frequent problem in the neurosciences. Especially deterministic approaches often have problems in finding the global optimum of the associated non-linear optimization function, when two or more di poles are to be reconstructed. In such cases, probabilistic approaches turned out to be superior, but their applicability in neuromagnetic source localizations is not yet satisfactory. The objective of this study was the design of multi-level evolution strategies that perform better in such applications. We newly created nested fast evolution strategies which realize a combination of locally searching inner evolution strategies and globally searching outer fast evolution strategies. They were benchmarked and compared to single-level fast evolution strategy by conducting a two dipole fit with a MEG data set from a neuropsychological experiment. In the comparison, fast nested evolution strategies showed superior performance.

关键词： Brain modeling Electroencephalography Simulated annealing Computational modeling Biomedical engineering Biomedical informatics optimization methods Computer simulation Humans Computer science

来源：评论

学校读者我要写书评

暂无评论

改进的GA算法及其在反共振机设计中的应用

引用

辽宁工程技术大学学报（自然科学版） 2007年第6期26卷 908-911页

作者：李允公张金萍赵波刘劲涛刘杰东北大学子机械工程与自动化学院辽宁沈阳110004 沈阳化工学院机械工程学院辽宁沈阳110142 辽宁省交通高等专科学校机械电子工程系辽宁沈阳110122

在满足工况要求的基础上,为使下质体振幅为小量,对振动机的动力参数进行多目标优化。结合反共振振动机的特点,提出了列表参数集遗传算法,该算法将由某一目标所得的参数集以列表形式表示,继而只对各参数的编号进行编码进行遗传优化。同时... 详细信息

在满足工况要求的基础上,为使下质体振幅为小量,对振动机的动力参数进行多目标优化。结合反共振振动机的特点,提出了列表参数集遗传算法,该算法将由某一目标所得的参数集以列表形式表示,继而只对各参数的编号进行编码进行遗传优化。同时,使用对标准遗传算法中的交叉操作的改进方式,扩大了每一代的搜索范围,提高了收敛速度。利用所提算法对反共振振动机的动力参数进行了优化,优化结果满足要求且说明算法使有效和实用的。

关键词：反共振振动机械遗传算法交叉操作优化

来源：评论

学校读者我要写书评

暂无评论

A genetic algorithm approach for multi-objective optimization of supply chain networks

引用

COMPUTERS & INDUSTRIAL ENGINEERING 2006年第1期51卷 196-215页

作者： Altiparmak, Fulya Gen, Mitsuo Lin, Lin Paksoy, Turan Gazi Univ Ankara Turkey Waseda Univ Grad Sch Informat Prod & Syst Tokyo Japan

Supply chain network (SCN) design is to provide an optimal platform for efficient and effective supply chain management. It is an important and strategic operations management problem in supply chain management, and usually involves multiple and conflicting objectives such as cost, service level, resource utilization, etc. This paper proposes a new solution procedure based on genetic algorithms to find the set of Pareto-optimal solutions for multi-objective SCN design problem. To deal with multi-objective and enable the decision maker for evaluating a greater number of alternative solutions, two different weight approaches are implemented in the proposed solution procedure. An experimental study using actual data from a company, which is a producer of plastic products in Turkey, is carried out into two stages. While the effects of weight approaches on the performance of proposed solution procedure are investigated in the first stage, the proposed solution procedure and simulated annealing are compared according to quality of Pareto-optimal solutions in the second stage. (c) 2006 Elsevier Ltd. All rights reserved.

关键词： supply chain network genetic algorithm multi-objective optimization

来源：评论

学校读者我要写书评

暂无评论

Order-planning model and algorithm for manufacturing steel sheets

引用

INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS 2006年第1期100卷 30-43页

作者： Liu, SX Tang, JF Song, JH Northeastern Univ Sch Informat Sci & Engn Shenyang 110004 Peoples R China Shanghai Baosight Software Co Ltd Met ERP Business Dept Shanghai 201900 Peoples R China

A multi-objective order-planning model is formulated for manufacturing steel sheets. The objectives include minimizing tardiness cost, balancing utility of capacities and minimizing inventory cost. The weighted-sum approach is used for transferring the multiple objectives into single one, as well as a penalty function is used for incorporating constraints into the objective function. Specific particle swarm optimization (PSO) algorithm is designed to solve the model. Taking three practical order-planning problems as instances, different sets of parameter combinations are systemically designed to test effectiveness and efficiency of the algorithm in experiments;computation results show that the model and algorithm are superior to human-machine coordination method. (c) 2004 Elsevier B.V. All rights reserved.

关键词： iron-steel industry steel sheet manufacturing flow shop process order planning weighted sum of criteria particle swarm optimization (PSO)

来源：评论

学校读者我要写书评

暂无评论

Automation of finite element aided design of induction motors using multi-slice 2D models

引用

COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING 2006年第2期25卷 309-319页

作者： Griffiths, DR Sykulski, JK FR HiTEMP Ltd Fareham England Univ Southampton EPE Sch ECS Southampton Hants England

Purpose - To develop a practical design tool employing a general purpose electromagnetic finite element (FE) software package to perform automated simulation and performance analysis of induction motors in a design and optimisation process. Design/methodology/approach - Recent publications identified a suitable approach in applying 2D finite-element analysis to 3D problems. This, together with other similar work carried out on brushless DC motors, set out a framework for program development. Performance of the program was validated against practical test data. Findings - Finite-element analysis-based design tools can be realistically employed within a design office environment and are capable of providing solutions within acceptable time scales. Such tools no longer require user expertise in the underlying FE modelling method. The multiple slice technique was employed to model skew in three-phase induction motors and it was established that a four-slice model provides a good balance between accuracy and speed of computation. Research limitations/impfications - Program development was based on one commercial FE software package and comparison with practical test data was not exhaustive. However, the approach outlined confirms the practical application. Future work could consider alternative approaches to optimisation. practical implications - Computing hardware and commercially available 2D FE software have developed sufficiently to enable multi-slice techniques and optimisation to be employed in the analysis and design of machines. Originality/value - This paper provides a practical illustration of how commercial electromagnetic software can be employed as a design tool, demonstrating to industry that such tools no longer need to be bespoke and can realistically be used within a design office.

关键词： finite element analysis computer aided design electric machines induction optimization techniques skewness

来源：评论

学校读者我要写书评

暂无评论

A user satisfaction level based multi-objective optimization method for grid task scheduling

A user satisfaction level based multi-objective optimization...

引用

5th International Conference on Grid and Cooperative Computing (GCC 2006)

作者： Wang, Xiaoying Du, Zhihui Li, Sanli Tsinghua Univ Dept Comp Sci & Technol Beijing 100084 Peoples R China

ISBN: (纸本)9780769526942

A user satisfaction level model, which focuses on the real feeling of grid users, is proposed in this paper. The model can integrate, not only multiple-aspect demands of different grid users, but also their preferences in different aspects. An abstract user satisfaction level function and its properties are also defined in the model. Based on the model, an effective grid task scheduling algorithm SatOpt is provided and a multivariate Gaussian Function is chosen as the practical user satisfaction level function, The SatOpt algorithm is a three-stage heuristic multi-objective optimization algorithm and it can achieve near ideal results. To validate the idea provided in this paper, a MetaService architecture which can provide an extensible and feasible implementation of the SatOpt algorithm is designed. Experiment results show that the Sat opt algorithm based on the user satisfaction level model can significantly improve the user satisfaction level compared with the related methods.

关键词： Grid computing

来源：评论

学校读者我要写书评

暂无评论

multi-objective simulation optimization:: A case study in healthcare management

引用

INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING-THEORY APPLICATIONS AND PRACTICE 2006年第2期13卷 156-165页

作者： Baesler, Felipe F. Sepulveda, Jose A. Univ Bio Bio Dept Ind Engn Concepcion Chile Univ Cent Florida Dept Ind Engn & Management Syst Orlando FL 32816 USA

This study presents an approach to solve multi-response simulation optimization problems. This approach integrates a simulation model with a genetic algorithm heuristic and a goal programming model. This method was modified to perform the search considering the mean and the variance of the responses. This way, the selection process of the genetic algorithm is performed stochastically, and not deterministically like most of the approaches reported in the literature. The methodology was tested using a simulation model of a cancer treatment facility created by the authors. The multi-objective optimization heuristic was successfully used to improve the performance of the model relative to four different system objectives. Empirical results show that the methodology is capable of generating an important part of the Pareto optimal frontier, mostly concentrated in the center portion, where practical solutions are generally located.

关键词： simulation optimization multi-objective genetic algorithms healthcare

来源：评论

学校读者我要写书评

暂无评论

Cognitive Radio Formulation and Implementation

Cognitive Radio Formulation and Implementation

引用

International Conference on Cognitive Radio Oriented Wireless Networks and Communications

作者： Thomas W. Rondeau Bin Le David Maldonado David Scaperoth Charles W. Bostian Center for Wireless Telecommunications Virginia Polytechnic Institute and State University Blacksburg VA USA

ISBN: (纸本)1424413804

This paper approaches cognition on the physical and MAC layers by defining a common language of "knobs" and "meters" to discuss adaptation and learning. Cognitive radio merges artificial intelligence and software defined radios (SDR). It requires a simple language for communicating between these two levels. We define a method for doing this. We also discuss a genetic algorithm approach to perform intelligent radio adaptation, using the GNU radio platform as an example. We provide both conceptual and practical implementation details of a cognitive radio acting at the physical and MAC layers. Results presented show the promise for the genetic algorithm adaptation within the multi-objective optimization environment of the cognitive radio

关键词： Cognitive radio Genetic algorithms Engines Constraint optimization Artificial intelligence Software radio Transceivers Radio control Postal services Cognition

来源：评论

学校读者我要写书评

暂无评论

带有机械电子元件的车辆底盘基于虚拟样机的优化设计

引用

工程设计学报 2006年第6期13卷 440-446,458页

作者： Yu Du[德] Peter Maiβer 吕新生（翻译）杨超操（译校）大众股份公司不详合肥工业大学机械与汽车工程学院 230009 魏德米勒电联结（苏州）有限公司 215000

提出带有机械电子元件的车辆底盘的优化设计方法和工具.为此,开发了一种转换软件,使得ADAM S/C ar的多体系统(M K S)车辆模型能够自动转换到软件工具a laska中,随后,转换成的车辆模型通过轮胎模型、驾驶员模型和机械电子操纵装置模型加... 详细信息

提出带有机械电子元件的车辆底盘的优化设计方法和工具.为此,开发了一种转换软件,使得ADAM S/C ar的多体系统(M K S)车辆模型能够自动转换到软件工具a laska中,随后,转换成的车辆模型通过轮胎模型、驾驶员模型和机械电子操纵装置模型加以扩展,整个系统符号化的模型方程由a laska生成,并且以C代码形式输出.进行了车辆动力学评价准则的分析,为以性能准则(目标函数)和附加准则(约束函数)的形式进行多目标优化作好准备.讨论了各种灵敏度分析方法,自动微分被作为一种符号化方法的有用工具引入.对不同的优化方法进行了试验和对比,优化计算在工作站集群的通讯传输系统M P I支持下并行运行.所开发方法和工具的效率已在实际应用案例中得到体现.

关键词：优化设计方法机械电子电子元件车辆底盘虚拟样机软件工具盘基车辆模型

来源：评论

学校读者我要写书评

暂无评论

A human-like numerical technique for design of engineering systems

引用

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2005年第14期64卷 1915-1943页

作者： Lee, CJK Furukawa, T Yoshimura, S Univ New S Wales ARC Ctr Excellence Autonomous Syst Sch Mech & Mfg Engn Sydney NSW 2052 Australia Univ Tokyo Grad Sch Frontier Sci Bunkyo Ku Tokyo 1138656 Japan

Because of the necessity for considering various creative and engineering design criteria, optimal design of an engineering system results in a highly-constrained multi-objective optimization problem. Major numerical approaches to such optimal design are to force the problem into a single objective function by introducing unjustifiable additional parameters and solve it using a single-objective optimization method. Due to its difference from human design in process, the resulting design often becomes completely different from that by a human designer. This paper presents a novel numerical design approach, which resembles the human design process. Similar to the human design process, the approach consists of two steps: (1) search for the solution space of the highly-constrained multi-objective optimization problem and (2) derivation of a final design solution from the solution space. multi-objective gradient-based method with Lagrangian multipliers (MOGM-LM) and centre-of-gravity method (CoGM) are further proposed as numerical methods for each step. The proposed approach was first applied to problems with test functions where the exact solutions are known, and results demonstrate that the proposed approach can find robust solutions, which cannot be found by conventional numerical design approaches. The approach was then applied to two practical design problems. Successful design in both the examples concludes that the proposed approach can be used for various design problems that involve both the creative and engineering design criteria. Copyright (c) 2005 John Wiley & Sons, Ltd.

关键词： human-like design multi-objective optimization gradient-based search constraint handling centre-of-gravity method

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：