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基于系统能量理论的多目标优化聚类集成研究 被引量:1
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作者 胡健 孙金花 《计算机工程与应用》 CSCD 北大核心 2011年第36期9-11,共3页
为提高聚类集成算法效率,弥补以往聚类集成算法的不足,确保多数聚类成员分簇的均匀无偏差,提出了一种新的基于聚类集成的多目标聚类分析框架,并利用系统能量理论定义了多目标聚类问题的优化目标函数。在此基础上,设计了一种启发式的K-E... 为提高聚类集成算法效率,弥补以往聚类集成算法的不足,确保多数聚类成员分簇的均匀无偏差,提出了一种新的基于聚类集成的多目标聚类分析框架,并利用系统能量理论定义了多目标聚类问题的优化目标函数。在此基础上,设计了一种启发式的K-ETMC聚类集成算法,并对Iris、Wine、Soybean三个数据集进行了快速有效的聚类分析,通过与MCLA,HGPA,CSPA三个典型聚类集成算法比较表明:该算法聚类效果较好,能够有效地改善聚类结果。 展开更多
关键词 聚类 集成学习 多目标优化 系统能量理论
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基于铜耗最小原则的混合磁路电机哈密顿速度控制 被引量:2
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作者 吴璟宇 康惠骏 《电机与控制应用》 北大核心 2010年第3期13-17,39,共6页
针对电机传统控制策略依赖模型精确性、对参数变化敏感等问题,从能量的观点出发,利用哈密顿能量系统理论来设计混合磁路电机的速度控制器。根据铜耗最小原则下的最优电流控制原理确定了系统期望的平衡点;利用互联和阻尼配置的方法,设计... 针对电机传统控制策略依赖模型精确性、对参数变化敏感等问题,从能量的观点出发,利用哈密顿能量系统理论来设计混合磁路电机的速度控制器。根据铜耗最小原则下的最优电流控制原理确定了系统期望的平衡点;利用互联和阻尼配置的方法,设计了系统在负载转矩已知时的速度控制器;并利用负载转矩估计器在线观测负载转矩,由此设计了系统在负载转矩未知时的速度控制器;同时给出了平衡点的稳定性分析。仿真结果验证了该控制策略具有较好的控制效果,对系统参数变化具有较好的鲁棒性。 展开更多
关键词 哈密顿能量系统理论 混合磁路电机 端口受控哈密顿
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A Reliability Analysis of Calculated Results for Odd-Even and Odd-Odd Nuclei in Relativistic Mean-Field Theory
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作者 DING Bin-Gang ZHANG Da-Li LU Ding-Hui 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第1X期113-118,共6页
We calculate the binding energies of Ni, Cu, Xe, Cs, Pt, Au, Np, Pu isotope chains using two interaction parameter sets NL-3 and NL-Z, and compared the relative errors of the even-even nuclei with those of odd-even nu... We calculate the binding energies of Ni, Cu, Xe, Cs, Pt, Au, Np, Pu isotope chains using two interaction parameter sets NL-3 and NL-Z, and compared the relative errors of the even-even nuclei with those of odd-even nuclei and odd-odd nuclei. We find that the errors of binding energy of odd-even and odd-odd nuclei are not bigger than the one of even-even nuclei. The result shows that comparing with even-even nuclei, there is no systematic error and approximation in the calculations of the binding energy of odd-even and odd-odd nuclei with relativistic mean-field theory. In addition, the result is explained theoretically. 展开更多
关键词 relativistic mean-field theory binding energy even-even nuclei odd-even nuclei odd-odd nuclei
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Theoretical and Experimental Study of a Cylindro-Parabolic Solar Collector
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作者 Y. Boukhchana A. Fellah A. Ben Brahim 《Journal of Environmental Science and Engineering》 2011年第8期1026-1030,共5页
This article outlines the theoretical and experimental performance studies of a cylindro-parabolic solar collector. The theoretical study consists on the establishment, through mass and energy balances, of a mathemati... This article outlines the theoretical and experimental performance studies of a cylindro-parabolic solar collector. The theoretical study consists on the establishment, through mass and energy balances, of a mathematical model to control the exiting temperature of the heating fluid as well as the temperatures of the absorber and the glass. The experimental level investigates the influence of the solar absorber tube diameter on the performances of the driving device. Several experiments were made in order to know the possibility to reach temperatures being able to ensure for example the ammonia vaporization in the generator of a solar absorption refrigeration system. These experiments were carried out under various operating and climatic conditions. The results are presented and discussed. 展开更多
关键词 Solar energy EXPERIMENTATION absorption refrigeration solar collector.
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A Novel Robot Motion Planning Model based on Visual Navigation and Fuzzy Control
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作者 Xiaomin Wang 《International Journal of Technology Management》 2016年第9期58-60,共3页
In this paper, we propose the novel robot motion planning model based on the visual navigation and fuzzy control. A robot operating system can be viewed as the mechanical energy converter from the joint space to the g... In this paper, we propose the novel robot motion planning model based on the visual navigation and fuzzy control. A robot operating system can be viewed as the mechanical energy converter from the joint space to the global operation space, and the fiexibility of the robot system refi ects the global transformation ability of the whole system. Fuzzy control technology is a kind of fuzzy science, artificial intelligence, knowledge engineering and other disciplines interdisciplinary fields, the theory of strong science and technology, to achieve this fuzzy control technology theory, known as the fuzzy control theory. Besides this, this paper integrates the visual navigation system to construct the better robust methodology which is meaningful. 展开更多
关键词 Robot Motion Planning Model Visual Navigation Fuzzy Control.
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Solution Space Coupling in the Random K-Satisfiability Problem 被引量:1
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作者 曾颖 周海军 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第9期363-374,共12页
The random K-satisfiability (K-SAT) problem is very diffcult when the clause density is close to the satisfiability threshold. In this paper we study this problem from the perspective of solution space coupling. We ... The random K-satisfiability (K-SAT) problem is very diffcult when the clause density is close to the satisfiability threshold. In this paper we study this problem from the perspective of solution space coupling. We divide a given difficult random K-SAT formula into two easy sub-formulas and let the two corresponding solution spaces to interact with each other through a coupling field x. We investigate the statistical mechanical property of this coupled system by mean field theory and computer simulations. The coupled system has an ergodicity-breaking (clustering) transition at certain critical value Xd of the coupling field. At this transition point, the mean overlap value between the solutions of the two solution spaces is very close to 1. The mean energy density of the coupled system at its clustering transition point is less than the mean energy density of the original K-SAT problem at the temperature-induced clustering transition point. The implications of this work for designing new heuristic K-SAT solvers are discussed. 展开更多
关键词 constraint satisfaction spin glass clustering transition belief propagation solution space
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