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This paper proposes a new approach for multi-objective robust control.The approach extends the standard generalized l2(Gl2)and generalized H2(GH2)conditions to a set of new linear matrix inequality(LMI)constraints based on a new stability condition.A technique for variable parameterization is introduced to the multi-objective control problem to preserve the linearity of the synthesis variables.Consequently,the multi-channel multi-objective mixed Gl2/GH2 control problem can be solved less conservatively using computationally tractable algorithms developed in the paper. 相似文献
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Multi-objective robust state-feedback controller synthesis problems for linear discrete-time uncertain systems are addressed. Based on parameter-dependent Lyapunov functions, the Gl2 and GH2 norm expressed in terms of LMI (Linear Matrix Inequality) characterizations are further generalized to cope with the robust analysis for convex polytopic uncertain system.Robust state-feedback controller synthesis conditions are also derived for this class of uncertain systems. Using the above results,multi-objective state-feedback controller synthesis procedures which involve the LMI optimization technique are developed and less conservative than the existing one. An illustrative example verified the validity of the approach. 相似文献
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This paper proposes a new approach for multi-objective robust control. The approach extends the standard generalizedl
2 (Gl
2) and generalizedH
2 (GH
2) conditions to a set of new linear matrix inequality (LMI) constraints based on a new stability condition. A technique for
variable parameterization is introduced to the multi-objective control problem to preserve the linearity of the synthesis
variables. Consequently, the multi-channel multi-objective mixed Gl
2/GH
2 control problem can be solved less conservatively using computationally tractable algorithms developed in the paper.
Project supported by the National Natural Science Foundation of China (No. 60374028), and the Scientific Research Foundation
for Returned Overseas Chinese Scholars, Ministry of Education (No. [2004]176) 相似文献
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INTRODUCTION The conventional economic load dispatch prob-lem of power generation involves allocation of power generation to different thermal units to minimize the operating cost subject to diverse equality and ine-quality constraints of the power system. This makes the economic load dispatch problem a large-scale highly non-linear constrained optimization problem. However, as a result of public awareness of envi-ronmental protection, diverse emission compliance strategies have emerged (… 相似文献
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The problem of adaptive multi-objective optimization(AMOO) has received extensive attention due to its practical significance.An important issue in optimizing a multi-objective system is adjusting the weighting coefficients of multiple objectives so as to keep track of various conditions.In this paper,a feedback structure for AMOO is designed.Moreover,the reinforcement learning combined with hidden biasing information is applied to online tuning weighting coefficients of objective functions.Finally,the prop... 相似文献
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装配线平衡问题是生产管理中重要且比较难解决的问题,其中如何分配工人到不同的工作站以提高生产效率是问题的关键。针对包含工人分配问题的装配线平衡问题,提出一种基于Pareto的问题无关的适应值计算方法的多目标遗传算法。算法中首先建立ALB-wa问题的数学模型,提出一个基于随机键编码的基因表达方式;使用匹配指定的染色体结构和ALB-wa问题的遗传操作;使用基于Pareto支配关系的评价函数来代替使用基于偏好的评价函数。最后,通过实验数值验证该方法的性能。结果表明,该方法具有较高的收敛性和效率,改进了现有的其他遗传算法。 相似文献
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SAT问题(可满足性问题)是计算机科学的核心问题,研究问题的方法很多,利用极小不可满足公式的性质来研究SAT问题是近几年兴起的一个热点研究方向. 文章主要利用,(1,*)-消解和分裂方法研究了差为2的唯一极小不可满足公式集(Unique-MU(2))和差为2的对称极小不可满足公式集(SYM-MU(2))的结构和复杂度. 相似文献
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This paper concerns with modeling and design of an algorithm for the portfolio selection problems with fixed transaction costs and minimum transaction lots. A mean-variance model for the portfolio selection problem is proposed, and the model is formulated as a non-smooth and nonlinear integer programming problem with multiple objective functions. As it has been proven that finding a feasible solution to the problem only is already NP-hard, based on NSGA-II and genetic algorithm for numerical optimization of constrained problems (Genocop), a multi-objective genetic algorithm (MOGA) is designed to solve the model. Its features comprise integer encoding and corresponding operators, and special treatment of constraints conditions. It is illustrated via a numerical example that the genetic algorithm can efficiently solve portfolio selection models proposed in this paper.This approach offers promise for the portfolio problems in practice. 相似文献
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李大东 《乐山师范学院学报》2003,18(4):13-16
本针对于用区间数表示指标值和权重值的多目标模糊指派问题，提出了两种新的算法。将其转化为传统的指派问题，并用匈牙利法解决。最后通过实例验证是行得通的。 相似文献
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Slava Kalyuga 《European Journal of Psychology of Education - EJPE》2013,28(4):1477-1493
Transferring one’s knowledge in new situations is usually associated with cognitively demanding processes. The paper explores an approach to facilitating transfer of knowledge by explicitly instructing learners in medium-level generalized but yet domain-connected knowledge structures that are applicable to a broader range of tasks in the domain and could be essential in managing the cognitive load associated with transfer. The paper includes a theoretical analysis of the potential role of the generalized domain knowledge in transfer and an experimental study designed to investigate the effectiveness of explicit instruction in a generalized domain knowledge structure (function–process–structure schema) in technical areas. Forty-nine undergraduate university students with low or no prior knowledge in the domain participated in the randomised 2 (schema-based vs. non-schema-based instruction)?×?2 (general-to-specific vs. specific-to-general knowledge sequences) experiment investigating the effects of these two factors on posttest transfer performance and subjective ratings of learning difficulty (interpreted as indicators of cognitive load). The results indicated a significant (p?<?0.05) main effect of schema-based instruction; a possible trend (p?<?0.1) favouring general-to-specific instructional sequence for posttest test performance; and a significant interaction between the two factors for ratings of difficulty. The paper concludes that (a) transfer within a domain could be facilitated by explicitly instructing learners in generalized domain schemas; (b) general-to-specific approach could possibly be used as a preferred instructional sequence for enhancing transfer; and (c) cognitive load perspective could add some valid arguments to explain the role of generalized domain knowledge in transfer. 相似文献
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多目标多模式运输问题的模糊规划方法解 总被引：2，自引：0，他引：2
本文在现有研究进展的基础上, 提出了一种用于求解多目标多模式运输问题(MOSTP)的最优折衷解的模糊规划方法, 该方法的特征是综合考虑了每个目标的边缘评价和所有目标的整体评价因素. 通过分配每个目标的权重将决策者的偏好充分体现到决策过程中, 并通过相应的折衷规划模型, 在对所有目标整体评价的基础上得到决策者所期望的折衷解. 由于采用广义的模糊目标集成算子, 该方法不仅对现有求解方法进行了扩展, 而且在求解方式上也更加灵活和切合实际. 最后采用实例论证了该方法的求解过程. 相似文献
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Francisco J. Martinez-Martin Fernando Gonzalez-Vidosa Antonio Hospitaler Víctor Yepes 《浙江大学学报(A卷英文版)》2012,13(6):420-432
This paper describes one approach to the design of reinforced concrete (RC) bridge piers, using a three-hybrid multi-objective simulated annealing (SA) algorithm with a neighborhood move based on the mutation operator from the genetic algorithms (GAs), namely MOSAMO1, MOSAMO2 and MOSAMO3. The procedure is applied to three objective functions: the economic cost, the reinforcing steel congestion and the embedded CO2 emissions. Additional results for a random walk and a descent local search multi-objective algorithm are presented. The evaluation of solutions follows the Spanish Code for structural concrete. The methodology was applied to a typical bridge pier of 23.97 m in height. This example involved 110 design variables. Results indicate that algorithm MOSAMO2 outperforms other algorithms regarding the definition of Pareto fronts. Further, the proposed procedure will help structural engineers to enhance their bridge pier designs. 相似文献
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对于一类网络时延未知有界的网络控制系统,建立其离散化系统模型,研究基于等价空间的故障检测问题。将残差产生器设计归结为最小化问题,通过求解广义特征向量问题给出等价向量的求解方法,进一步通过奇异值分解得到等价向量解析解的一般形式。算例验证了提出方法的有效性。 相似文献
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一种离散型多目标粒子群优化算法 总被引：1，自引：1，他引：0
为获得更好的非劣前端,提出一种离散型多目标粒子群优化算法。该算法根据离散型多目标优化问题的特点,将种群分成多个子种群,在各个子种群中利用表现型共享的适应度函数选择每个子种群的最优粒子。通过多个最优粒子的引导,使整个种群分布更均匀,避免陷入局部最优,保证了解的多样性。实验表明了该算法的有效性。 相似文献
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研究了Banach空间中一类G-可导映射的广义拟向量变分不等式问题,运用KKM定理证明这类问题解的存在性,并在适当的条件下证明了此类问题与Konnov I V和Yao J C等人提出的广义向量变分不等式问题是等价的。 相似文献
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在希尔伯特空间,我们引入一个新的迭代序列来逼近广义均衡问题和有限组扩张映像的不动点的公共元素.相应推广了Satoru Takahashi,Wararu Takahashi[Strong convergence theorem for a generalized equilibrium prob-lem and a nonexpansive mapping in a Hilbert space,Nonlinear Analysis 69（2008）0250-1033] 相似文献
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ZUO Dong-hong DU Xu YANG Zong-kai 《浙江大学学报(A卷英文版)》2007,8(8):1191-1198
Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks. 相似文献
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刘智勇 《五邑大学学报(社会科学版)》1990,(Z1)
本文提出一种递推二阶逼近方法。它利用修正的BFGS公式来构造实际目标函数的Hessian矩阵,通过解一个二阶近似优化问题——这个问题由修正的BFGS公式确定,来得到一个迭代搜索方向。为了获得一个新的迭代点并考虑到实际应用条件的差别,本文给出两种迭代更新策略:一个是牛顿步方法;另一个是一维搜索方法。在一些局部条件下,本文提出的方法具有R—超线性收敛的性质。本文将给出算法的全局收敛性条件和最优性条件,并给出算法收敛速率的估计。最后进行仿真研究,表明新算法的优越性。 相似文献