脉冲水射流水力共振系统理想脉冲源研究

阐明强制施加的无衰减标准正弦脉冲是水射流水力共振系统的理想脉冲源,创立用恒流源、在其出口旁接活塞缸、使活塞在缸内作往复正弦速度运动产生理想流量脉冲的方案,给出电动活塞泵用凸轮机构传动提供恒定流量、旁接缸活塞用凸轮机构或曲轴连杆机构传动使缸的容积呈正弦变化的技术.     

Optimal Bayesian single-sampling attribute plans with modified beta prior distribution

In this article we study the properties of the optimal Bayesian single-sampling plans when the prior distribution of the lot fraction defective is modified Beta, which has been found useful in the analysis of inspection schemes for complex production systems. These properties are used to devise an improved and more efficient algorithm for the determination of the optimal sampling plans. Numerical examples are presented to illustrate the potential computational savings of the algorithm.     

A branch and bound algorithm for computing optimal replacement policies in consecutive k‐out‐of‐n‐systems

This paper presents a branch and bound algorithm for computing optimal replacement policies in a discrete‐time, infinite‐horizon, dynamic programming model of a binary coherent system with n statistically independent components, and then specializes the algorithm to consecutive k‐out‐of‐n systems. The objective is to minimize the long‐run expected average undiscounted cost per period. (Costs arise when the system fails and when failed components are replaced.) An earlier paper established the optimality of following a critical component policy (CCP), i.e., a policy specified by a critical component set and the rule: Replace a component if and only if it is failed and in the critical component set. Computing an optimal CCP is a optimization problem with n binary variables and a nonlinear objective function. Our branch and bound algorithm for solving this problem has memory storage requirement O(n) for consecutive k‐out‐of‐n systems. Extensive computational experiments on such systems involving over 350,000 test problems with n ranging from 10 to 150 find this algorithm to be effective when n ≤ 40 or k is near n. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 288–302, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10017     

歼击机空战占位的模糊神经网络方法

在歼击机空战中 ,首先占据有利的攻击位置 ,是夺取空战胜利的重要保证 ,不论是近距离格斗 ,还是超视距空战均如此。在未来 2 1世纪信息战环境下的空战 ,为了减轻飞机员的负担 ,必须根据战场态势 ,利用智能化方法 ,为飞行员提供正确操纵飞机达到有利攻击位置的辅助决策指示。本文研究了先敌占位的模糊神经网络方法 ,仿真证明这种方法是有效的     

新经济下的兵团高技术产业发展模式探讨

在新经济时代,兵团高技术产业应以农业为基础,运用现代生物技术和节水技术,走可持续农业的发展战略,建立以政策创新、机制创新和技术创新为支撑的高新技术产业发展模式.     

关联理论与阅读理解

本文从关联理论的角度讨论阅读理解的认知过程,提出关联理论对阅读理解的认知过程有极强的解释力,具体阐述了这一理论在阅读理解中的运用,揭示了关联理论对帮助学生改进阅读策略有指导意义.     

A Bayesian analysis on the effect of multiple supply options in a quick response environment

In the apparel industry, vendors often suffer from high mismatches in supply and demand. To cope with this problem, they procure the same style product from different suppliers with different manufacturing costs. Especially in the quick response environment, which allows vendors to monitor trends in customer demand and search for available suppliers through the electronic market, they have additional opportunities to improve their decision‐making. In this paper, we propose an analytical profit maximization model and develop efficient decision tools to help both the middle and lower level managers pursuing this strategy. Furthermore, we have shown how significantly the vendors' potential competitive edge can be improved by exploiting multiple supply options, even at the expense of high premium procurement costs for late orders. The effect is critical, especially in a highly competitive market, and it has important implications for the top managers. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

The cost impact of using simple forecasting techniques in a supply chain

In this paper we consider an inventory model in which the retailer does not know the exact distribution of demand and thus must use some observed demand data to forecast demand. We present an extension of the basic newsvendor model that allows us to quantify the value of the observed demand data and the impact of suboptimal forecasting on the expected costs at the retailer. We demonstrate the approach through an example in which the retailer employs a commonly used forecasting technique, exponential smoothing. The model is also used to quantify the value of information and information sharing for a decoupled supply chain in which both the retailer and the manufacturer must forecast demand. © 2003 Wiley Periodicals, Inc. Naval Research Logistics 50: 388–411, 2003     

The value of information sharing in a two‐stage supply chain with production capacity constraints

We consider a simple two‐stage supply chain with a single retailer facing i.i.d. demand and a single manufacturer with finite production capacity. We analyze the value of information sharing between the retailer and the manufacturer over a finite time horizon. In our model, the manufacturer receives demand information from the retailer even during time periods in which the retailer does not order. To analyze the impact of information sharing, we consider the following three strategies: (1) the retailer does not share demand information with the manufacturer; (2) the retailer does share demand information with the manufacturer and the manufacturer uses the optimal policy to schedule production; (3) the retailer shares demand information with the manufacturer and the manufacturer uses a greedy policy to schedule production. These strategies allow us to study the impact of information sharing on the manufacturer as a function of the production capacity, and the frequency and timing in which demand information is shared. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

机动输油管线泵机组仿真模型构建

受经费、人力、装备等因素的制约,机动型输油管线的实装训练往往难以开展,而开展仿真训练则是提高训练水平和效益的重要手段。构建机动输油管线泵机组仿真模型是模拟器研制和管线系统仿真的基础。建立了机动输油管线泵机组柴油机、增速器、离心泵的数学模型,给出了泵机组仿真计算的基本流程,建立了基于统一建模语言（UML）的泵机组仿真模型类图。所提出的建模方法同样适用于滑片泵泵机组。