On the evaluation of strategies for branching bandit processes

Glazebrook [1] has given an account of improved procedures for strategy evaluation for resource allocation in a stochastic environment. These methods are extended in the paper in such a way that they can be applied to problems which, for example, have precedence constraints and/or an arrivals process of new jobs. Theoretical results, backed up by numerical studies, show that quasi-myopic heuristics often perform well.     

外企与国企培训战略对比

人才培训战略是企业人力资源战略的基础。本通过外资企业与国内企业的培训战略对比，并对国内企业中人才培训存在的不足与缺点进行了分析与探讨。     

中小企业的发展策略

分析中小企业的发展过程可以发现其许多存在已久的弊病，它们已成为阻碍企业继续发展的重要因素。在加入WTO后，一些保护性政策将逐渐取消，国内中小企业原有的许多优势将与国外竞争对手所共有，原先不被重视的知识产权等问题的重要性却在逐步增加，所有这一切都要求中小企业必须要有新的思想和发展策略来应对即将到来的新的竞争。     

基于遗传算法的座位优化控制模型

座位优化控制是航空运输界增加利润的有效方法 .基于旅客的需求预测 ,可以利用数学规划模型为不同的航段和票价组合计算座位销售上限或者销售竞价 ,从而达到单个航班收入最大化的目的 .常用的方法可分为确定模型和概率模型 ,但对多航段多舱位的优化问题 ,由于出现了复杂的组合和约束 ,这些模型必须简化 .提出了基于遗传算法的座位优化控制模型 ,并和常用的优化方法进行了仿真对比 .研究结果表明 ,遗传算法应用于座位优化 ,可得到满意的解 ,同时 ,遗传算法简化了复杂的约束关系 ,易于实现 ,具有明显的优势 .     

Two-storage inventory model with lot-size dependent fuzzy lead-time under possibility constraints via genetic algorithm

Multi-item inventory models with stock dependent demand and two storage facilities are developed in a fuzzy environment where processing time of each unit is fuzzy and the processing time of a lot is correlated with its size. These are order-quantity reorder-point models with back-ordering if required. Here possibility and crisp constraints on investment and capacity of the small storehouse respectively are considered. The models are formulated as fuzzy chance constrained programming problem and is solved via generalized reduced gradient (GRG) technique when crisp equivalent of the constraints are available. A genetic algorithm (GA) is developed based on fuzzy simulation and entropy where region of search space gradually decreases to a small neighborhood of the optima and it is used to solve the models whenever the equivalent crisp form of the constraint is not available. The models are illustrated with some numerical examples and some sensitivity analyses have been done. For some particular cases results observed via GRG and GA are compared.     

Joint pricing and inventory control with a Markovian demand model

We consider the joint pricing and inventory control problem for a single product over a finite horizon and with periodic review. The demand distribution in each period is determined by an exogenous Markov chain. Pricing and ordering decisions are made at the beginning of each period and all shortages are backlogged. The surplus costs as well as fixed and variable costs are state dependent. We show the existence of an optimal (s, S, p)-type feedback policy for the additive demand model. We extend the model to the case of emergency orders. We compute the optimal policy for a class of Markovian demand and illustrate the benefits of dynamic pricing over fixed pricing through numerical examples. The results indicate that it is more beneficial to implement dynamic pricing in a Markovian demand environment with a high fixed ordering cost or with high demand variability.     

一类线性系统的数值控制设计

主要讨论了具有不稳定切换子模型的切换线性系统的稳定性问题.首先考虑了通过设计切换律来达到切换线性系统的稳定性问题.然后研究了切换线性控制系统可镇定性问题,通过设计控制律和切换律得到系统可镇定的判据.     

风险项目的投资期权分析

本文讨论了风险投资家向企业主融资时的投资期权,求出了投资期权的表达式,并对其中的一些参数进行了分析.     

待钻井处钻前油层压力预测的数学模型及求解

根据所研究问题的特点,将地下三相流体假设为单相流体,再利用渗流理论建立了确定地下流体压力的数学模型,并讨论了数值求解方法.当钻井前准备要采用某一注采方案时,利用此数学模型可以求得待钻井处各油层流体压力在不同时刻的值,这为评价该注采方案的优劣及进一步确定最优注采方案提供了科学依据.最后利用此模型对实际问题进行了模拟计算,验证了模型的正确性和计算的可靠性.     

税企博弈模型的再研究

本文以文[1]基础,在更一般条件下提出了税企博弈模型,得到新的骗税罚款系数公式.从理论上证明了税务机关对企业抽样检查与全面检查具有相同的经济效果.最后,给出建模应注意的几个问题.