随机需求下具有有效期的易变质物品的库存管理北大核心CSCD

本本文研究了无限时间具有有效期的易变质物品的(T,r,Q)的库存补货策略.在市场需求率随机,允许缺货且设定最大缺货量的条件下,建立了一个确定易变质物品最优补货策略的优化模型,并采用缺货回补的办法,利用多元极值和隐函数定理的思想得到了最优补货批量和订货点.在最后的算例中,通过Matlab软件模拟出最优补货批量和最优缺货量,并对模型的参数作了灵敏性分析.     

Weibull变质率和短缺量拖后的易变质物品EOQ模型

基于需求和采购价格均为时变的EOQ模型,考虑物品的变质率呈更符合现实情况的三参数Weibull分布,同时考虑短缺量拖后和资金时值对易变质物品库存管理的影响,构建了相应的EOQ模型.应用数学软件Matlab对该库存模型进行仿真计算和主要影响参数的灵敏度分析.结果表明,该模型存在最优解,且各主要影响参数对最优库存控制各有不同程度的影响,资金时值对库存总成本净现值的影响程度要甚于短缺量拖后的影响,故在制定科学的库存策略时资金时值需要更加关注.     

库存系统中的时滞变质物品的EOQ模型

本文考虑时段性变质物品的库存问题 .给出了一订货就交货 ,不允许缺货的时滞变质物品的库存模型与最优库存策略 ,并证明了该模型不是那物品自始至终有变质性质的 EOQ模型的简单叠加 .     

需求率为斜坡型的一类变质性物品最优库存策略

本文在考虑需求率服从斜坡型分布的情况下,研究了允许缺货且缺货完全回补、变质率服从威布尔分布、补货率为无穷、有限计划期内的库存模型,证明了最优补货策略的存在性,并给出了求解最优补货策略的算法.     

库存系统中的时滞变质物品的EOQ模型

本考虑时段性变质物品的库存问题。给出了一订货就交货,不允许缺货的时滞变质物品的库存模型与最优库存策略,并证明了该模型不是那物品自始至终有变质性质的EOQ模型的简单叠加。     

需求离散的变质性物品库存补充策略优化研究

研究了在不允许缺货情况下需求为离散的变质性物品的库存补充策略问题.在假定变质率为常数的情况下,建立了有限时域内变质性物品的补充策略模型,并给出了求最优补充策略的方法.     

上升线性需求条件下考虑资金时间价值的变质性物品生产库存模型

变质性物品生产库存系统的研究具有重要实际意义.本文研究了变质性物品生产库存系统在上升趋势线性需求条件下,考虑资金的时间价值,在有限计划时间水平内,如何确定最优生产周期,各周期最优生产率,以及最优库存安排策略.通过本文的研究,得到了一些有用的结论.     

带有两货栈及时变需求的变质性物品的最优EOQ模型(英)

本文针对一般的时变需求与两个货栈（自己货栈和租用货栈），建立了变质性物品的最优确定性EOQ模型，提供了用来寻求最优补充策略的方法，并就线性需求出示了两个数值例子．     

带有两货栈及时变需求的变质性物品的最优EOQ模型

本文针对一般的时变需求与两个货栈，建立了变质性物品的最优确定性ＥＯＱ模型，提供了用来寻求最优补充策略的方法，并步线性需求出示了两个数值例子。     

延期支付条件下允许缺货的变质物品库存模型

在延期支付条件下,建立了缺货量部分拖后的变质物品库存模型,证明了最优解的存在性与唯一性,并给出确定最优订购策略的算法步骤,最后用数值例子验证了模型与算法的有效性.     

关于管理比较研究中应注意的问题——兼谈“中国式管理”的建立基础

本文出于建立“中国式管理”的目的，着重探讨了现在管理比较研究中存在的问题．首先从社会学角度探讨了管理的由来、作用及其两重性；其次，中国现状十分需要加强管理，而引进的先进经验又不一定适合中国国情；管理比较研究是建立中国式管理的捷径．目前．管理比较研究存在着忽视与社会、经济、文化等比较研究相结合的问题，使得现在比较流行的日美管理比较研究的结论有一些不合理．并指出解决这一问题就要进行广泛全面的比较研究．     

Why indexing works

We develop a simple stock selection model to explain why active equity managers tend to underperform a benchmark index. We motivate our model with the empirical observation that the best performing stocks in a broad market index often perform much better than the other stocks in the index. Randomly selecting a subset of securities from the index may dramatically increase the chance of underperforming the index. The relative likelihood of underperformance by investors choosing active management likely is much more important than the loss those same investors take due to the higher fees of active management relative to passive index investing. Thus, active management may be even more challenging than previously believed, and the stakes for finding the best active managers may be larger than previously assumed.     

企业管理的有效性、管理效率与管理变迁

为了客观公正地评价一个企业的管理有效性,本文深入挖掘了企业管理有效性概念的内涵与外延,并提出根据管理有效性的内涵确定管理效益指标体系,根据它的外延确定管理绩效的测算方法这一基本原则。基于此项原则,建立了管理前沿、管理效率和管理变迁的数理概念和测算方法。利用数据包络分析模型对我国30个省市自治区工业企业2002、2003年的管理效率以及2003年的管理变迁的评测结果表明:同时考察管理效率和管理变迁这两个技术指标,可以更客观、更全面地评价一个企业的管理有效性。     

A methodology for integrated critical spare parts and insurance management

Critical spare‐parts stock optimization has become a relevant topic for academy and industry. In most articles, the problem has been stated as a trade‐off between economic risks of shortages and financial costs. Risk optimization in this context has been mainly studied from a logistics point of view. The most common decision variables have been stock levels, stock location, and reorder points. In this context, buying insurance to cover shortage cost can be a complementary (or exclusive) measure for risk mitigation. Insurance optimization traditionally has been studied from a microeconomic and financial perspective. The main decision variable has been the indemnity function, and occasionally, the insurance premium. Its use in the context of physical asset management has not been observed to the best of our knowledge. This creates an opportunity to link inventory optimization techniques with insurance optimization for shortage losses. In this work, we present a novel approach to jointly manage the shortage risk of a critical non‐repairable component in a unique critical system. We develop an original model to integrate critical spare‐parts stock optimization with insurance optimization techniques. The result is a decision model to select the optimal stock and insurance policy that maximizes the decision maker's expected utility. This allows for a business‐centered integrated perspective in critical parts decisions. We present a case study representative of the mining industry, illustrating the complementary nature of selecting optimal stock levels and contracting an optimal insurance. Our results show that contracting an insurance can lead to policies preferred by a risk‐averse decision maker. The case study shows that this may even occur lowering stock levels and increasing profits. Copyright © 2015 John Wiley & Sons, Ltd.     

A quality of service negotiation-based vertical handoff decision scheme in heterogeneous wireless systems

This paper introduces a novel vertical handoff decision scheme. The objective is to provide users with enhanced quality of service (QoS) and maximize the network revenue. This scheme balances both-side interests via a suitably defined network merit function and a user–operator negotiation model. The merit function evaluates network performance based on user preferences and decides the most appropriate network for users. The negotiation model is defined as a semi-Markov decision process (SMDP). An optimal policy that maximizes the network revenue without violating QoS constraints is found by resolving the SMDP problem using Q-learning. Furthermore, a time-adaptive QoS monitoring mechanism is combined with the merit function in order to decrease the power consumption on terminal interface activation. The simulation results demonstrate that the proposed vertical handoff decision scheme enhances the performance in terms of power consumption, handoff call-dropping probability (HCDP) and network revenue.     

Inventory management under highly uncertain demand

We show that base-stock levels first increase and then decrease as the standard deviation increases for a variety of non-negative random variables with a given mean and provide a distribution-free upper bound for optimal base-stock levels that grows linearly with the standard deviation and then remains constant.     

高校科研微观管理系统研究

本文以高校科研过程和科研管理过程并行运作为事实基础，以系统论中的耦合性、整体性和层次性为方法和手段，探讨了高校科研管理运行机制与体制，并提出若干高校科研管理策略构想。     

A framework for the value of information in inventory replenishment

Technological advances and changes in supply chain management practices have combined to draw attention to the value of information sharing in inventory replenishment. Academic research has produced seemingly conflicting results due to differences in the type of information that is shared, the supply chain structure, and the selection and parameterization of performance goals. This research provides a framework to help explain apparent differences in the extant literature. Our purpose is to understand what determines the value of information. With this specific view, we establish a set of research questions and suggest directions for future research.     

决策支持系统中模型管理系统的一种设计和实现方法

本提出了一种基于外模式、逻辑结构和方法库的三级DSS模型系统结构。在此基础上设计了一个具有模型、数据管理功能，友善用户接口界面，能对不同用户提供支持的决策支持系统。     

Information management in distributed collaborative systems: The case of collaboration studio

This paper presents the Collaboration Studio (CS) system, its argumentation and data-structuring models and gives some insights for dealing with information divergence. The system allows discussions among a group of participants that includes a coordinator. The working mechanisms implemented within CS are perfectly transparent to the user, hiding implementation details, giving an appealing and user-friendly environment, and so users do not have to worry about patterns of data distribution, or the details of distribution management. CS shares characteristics with other collaboration computational tools, such as synchronous and asynchronous support and both group working spaces and a local working space. However, its main purpose differs in that, instead of trying to achieve a single document as the outcome of the joint work of several users, CS aims to achieve a broader objective, which is to register (and to demonstrate) the “path” used to obtain certain knowledge.