最优策略

To modify the common genetic algorithms, the niche technique and reserving the best individual are added to it.

在普通遗传算法的基础上加入了小生境技术和保留上一代最优个体的策略，以达到改进算法的目的。

A model is initially developed based on the in the integer programming, whose objective function is subject to the minimization of the total re-shuffle containers. To reduce the total number of reshuffles for retrieving the containers, a hybrid algorithm, which combines heuristic rule and distributed genetic algorithm, is employed to solve the model. The heuristic rule is to reduce the range of feasible solution and distributed genetic algorithm is to solve the optimization.

该策略以压箱数最少为目标，建立基于整数规划的选位模型；根据发箱时较低翻箱率的要求，采用启发式算法和分布式遗传算法相结合的混合算法求解选位模型；其中启发式规则用于缩小可行解的范围，分布式遗传算法用于求近似最优解。

According to the features of refrigerated food in perishable commodity, this paper aims to construct a profit model on condition of uncertain delivery time by introducing price discount system and present optimal ordering strategy, viz.

针对易腐物品中冷藏食品的特性，构建交货期不定情况下的利润模型，并引入价格折扣机制，可以提出最优订货策略，即根据市场需求的变化以及价格等多方面因素，制定灵活的动态的订货时间，从而可保证企业利润最大化。

the effect of inertia weight on particle swarm optimization is studied,on basis of which adopts four kinds of strategies of inertia weight to regulate the speed of a new quantum delta potential well based particle swarm optimization.a faster and more stabile algorithm,found by comparing the performances of four equations regulated the inertia weight,solves 0/1 knapsack problem.the result of experiment shows that the modified algorithm improves the precision of optimal solution and has a faster speed and a higher efficiency in convergence.in a word,choosing a parameter of inertia weight suitably can improve the performance of new qdpso.

摘 要：在研究惯性权重对基本pso算法影响的基础上，根据惯性权重对粒子群算法影响的特点，采用4种惯性权重策略对一种新的具有量子行为的粒子群算法的速度进行调节，比较每种算法的性能，从中找到一种新的性能更好的改进算法，将其用于求解0-1背包问题。实验结果表明较好地选择惯性权重参数对算法的性能有很大提高，该改进算法在求解0-1背包问题中具有高效性，提高了最优解的精度，同时具有较快的收敛速度。

The reactionsystem of polyesterification of DFA and EG was analyzed and simplified. Based on thehypothesis of equal and unequal activity of the end-group of monomer and polymer,the modelⅠand modelⅡfor estimating kinetic parameters were established usingimproved Genetic Algorithm, which was so improved by introducing the Elitist Model,Simulate annealing, Runge-Kutta method, proportional distribution randomizer etc.into the operators, and these models were more compatible with the estimation ofcomplex reaction kinetic model parameters.

对二聚脂肪酸与乙二醇缩聚反应体系进行了分析和简化，基于单体和聚合物端基等活性及不等活性的假设，采用已加入最优保存策略、变量数值扰动、龙格库塔积分(Runge-Kutta)算法、均匀分布的随机数发生器算子的遗传算法，建立了模型Ⅰ和模型Ⅱ，并利用C~计算机语言编程来估算动力学模型的参数。

A joint optimization strategy for relay selection and power allocation is proposed to optimize the performance of cooperative communication system.

为了优化协作通信系统的性能，提出了一种基于信道容量增益的中继节点选取策略，并在此基础上提出了源节点和中继节点最优功率分配算法。

Strategy for designing optimal bounded control to minimize the response of quasi partially-integrable Hamiltonian systems with stochastic excitations is proposed based on the stochastic averaging method for quasi partially-integrable Hamiltonian systems and the stochastic dynamical programming principle.

本文提出了一种基于拟部分可积Hamilton系统随机平均法和随机动态规划原理的最优有界控制策略。

An adaptive genetic algorithm in conjunction with multi-population genetic strategy, entropy-based searching technique with narrowing down space and the quasi-exact penalty function was developed to solve the optimization problem. The proposed method culd successfully balance the efficiency against precision, and close the optimal solution quickly and stability.

一个自适应的遗传算法被用于求解上述优化模型，该算法采用多种群遗传策略、信息熵控制的空间减缩搜索技术以及拟精确罚函数方法，较好地平衡了效率与精度之间的关系，从而能够快速而稳定地逼近最优解。

Moreover, we also give the optimal strategies under the risk-reward framework.

同时，在风险回报竞争分析框架下，进一步讨论了上述问题，得到了给定预期和风险下收益最优的竞争策略。

We introduce the risk and reward into the traditional competitive analysis and establish the risk-reward framework. The optimal purchasing strategies together with their competitive ratios are provided finally.

我们把消费者的风险预期引入到传统的竞争分析中，建立了风险补偿框架下的折扣商品购买模型，并得到了最优购买策略及其竞争比。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。