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解灰色非线性规划问题的随机搜索算法 被引量:2
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作者 周伟平 刘兵兵 《计算机应用》 CSCD 北大核心 2013年第10期2819-2821,共3页
对带约束条件的灰色非线性规划问题进行了探讨,首先将原灰色约束非线性规划问题进行均值白化处理,转化成一个确定型的带约束条件的非线性规划问题,对该确定型的非线性约束规划问题提出一个基于分布估计算法的随机搜索方法,对所提出的求... 对带约束条件的灰色非线性规划问题进行了探讨,首先将原灰色约束非线性规划问题进行均值白化处理,转化成一个确定型的带约束条件的非线性规划问题,对该确定型的非线性约束规划问题提出一个基于分布估计算法的随机搜索方法,对所提出的求解方法的关键技术作了详细的说明并给出了具体的算法步骤。初步的数值算例表明所提出的方法是可行有效的。 展开更多
关键词 灰色非线性规划 均值白化模型 分布估计算法 (近似)最优 蒙特卡罗模拟
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Improvement of Lagrangian relaxation performance for open pit mines constrained long-term production scheduling problem 被引量:2
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作者 E.Moosavi J.Gholamnejad +1 位作者 M.Ataee-pour E.Khorram 《Journal of Central South University》 SCIE EI CAS 2014年第7期2848-2856,共9页
Constrained long-term production scheduling problem(CLTPSP) of open pit mines has been extensively studied in the past few decades due to its wide application in mining projects and the computational challenges it pos... Constrained long-term production scheduling problem(CLTPSP) of open pit mines has been extensively studied in the past few decades due to its wide application in mining projects and the computational challenges it poses become an NP-hard problem.This problem has major practical significance because the effectiveness of the schedules obtained has strong economical impact for any mining project.Despite of the rapid theoretical and technical advances in this field,heuristics is still the only viable approach for large scale industrial applications.This work presents an approach combining genetic algorithms(GAs) and Lagrangian relaxation(LR) to optimally determine the CLTPSP of open pit mines.GAs are stochastic,parallel search algorithms based on the natural selection and the process of evolution.LR method is known for handling large-scale separable problems; however,the convergence to the optimal solution can be slow.The proposed Lagrangian relaxation and genetic algorithms(LR-GAs) combines genetic algorithms into Lagrangian relaxation method to update the Lagrangian multipliers.This approach leads to improve the performance of Lagrangian relaxation method in solving CLTPSP.Numerical results demonstrate that the LR method using GAs to improve its performance speeding up the convergence.Subsequently,highly near-optimal solution to the CLTPSP can be achieved by the LR-GAs. 展开更多
关键词 constrained long-term production scheduling problem open pit mine Lagrangian relaxation genetic algorithm
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Hierarchical multicast with inter-layer random network coding 被引量:1
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作者 司菁菁 Zhuang Bojin Cai Anni 《High Technology Letters》 EI CAS 2011年第1期86-90,共5页
To maximize the aggregate throughput achieved in heterogeneous networks, this paper investigates inter-session network coding for the distribution of layered source data. We define inter-layer hierarchical random line... To maximize the aggregate throughput achieved in heterogeneous networks, this paper investigates inter-session network coding for the distribution of layered source data. We define inter-layer hierarchical random linear network codes (IHRLNC), which not only take the flexibility of intersession network coding for layer mixing but also consider the strict priority inherent in the layered source data. Furthermore, we propose the inter-layer hierarchical multicast (IHM), which performs IHRLNC in the network such that each sink can recover some source layers according to its individu- al capacity. To determine the optimal type of IHRLNC that should be performed on each edge in IHM, we formulate an optimization problem based on 0-1 integer linear programming, and propose a heuristic approach to approximate the optimal solution in polynomial time. Simulation results show that the proposed IHM can achieve throughput gains over the layered muhicast schemes. 展开更多
关键词 network coding inter-session inter-layer hierarchical multicast (IHM) LAYERED
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