Network design for time‐constrained delivery

To meet customer demand, delivery companies are offering an increasing number of time‐definite services. In this article, we examine the strategic design of delivery networks which can efficiently provide these services. Because of the high cost of direct connections, we focus on tree‐structured networks. As it may not be possible to identify a tree‐structured network that satisfies all of the delivery guarantees, we allow these guarantees to be violated but seek to minimize the sum of the violations. We establish the complexity of the problem and exploit an empirically identified solution structure to create new neighborhoods which improve solution values over more general neighborhood structures. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

面向信号的仪器驱动程序建模

面向信号自动测试系统开发模式是今后的发展方向,而面向信号的仪器驱动程序是实现测试软件仪器无关性的重要途径,分析了自动测试系统的架构,建立了信号驱动程序的信息模型,研究了驱动程序的结构,并结合实例对驱动程序的调用进行了说明。     

一种雷达红外联合部署模型及优化求解方法

针对战场上种类和数量众多的传感器配合使用的情况,为了充分利用传感器资源,提高传感器网的探测性能,提出了一种雷达红外联合优化部署方法.本方法借鉴了离散化思想对防区进行了划分,用矩阵形式对雷达红外联合部署方案、探测能力、约束条件以及探测要求进行了描述,给出了优化问题的数学模型,并使用PSO算法对问题求解.给出了仿真结果,证...     

Supplier certification and quality investment in supply chains

Global sourcing has made quality management a more challenging task, and supplier certification has emerged as a solution to overcome suppliers' informational advantage about their product quality. This article analyzes the impact of certification standards on the supplier's investment in quality, when a buyer outsources the production process. Based on our results, deterministic certification may lead to under‐investment in quality improvement technology for efficient suppliers, thereby leading to potential supply chain inefficiency. The introduction of noisy certification may alleviate this under‐investment problem, when the cost of information asymmetry is high. While allowing noisy certification always empowers the buyer to offer a menu to screen among heterogeneous suppliers, the buyer may optimally choose only a limited number of certification standards. Our analysis provides a clear‐cut prediction of the types of certifiers the buyer should use for heterogeneous suppliers, and we identify the conditions under which the supplier benefits from noisy certification. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

自适应LMS和相关算法在GMI磁传感器信号检测中的应用

在GMI磁传感器的研制中,微弱磁场信号经常淹没于电路固有噪声中。当非晶丝GMI(GiantMagneto-Impedance)磁传感器的输出信噪比小于0dB时,常规的峰值检波方法无法检出传感器信号。针对此问题,提出了一种新的微弱信号(信噪比小于0dB)检测方法,利用LMS自适应滤波算法提取非晶丝GMI磁传感器输出信号的特征参数,将该特征参数与理想参数进行相关运算,并根据相关值的大小来确定信号大小,从而实现对微弱磁信号的测量。仿真结果表明,采用LMS自适应滤波算法和相关分析相结合的方法,对于传感器输出信噪比等于-10dB的微弱信号,根据相关值与外磁场大小的对应关系,仍然可以确定外磁场大小。     

女性解放:鲁迅杂文人学的精神呼唤

鲁迅作为伟大的人道主义者,一生执著探索“立人”的道路.在主张“立人”和“解放人性”的呐喊中,把自己的同情关爱与道义责任倾注在社会底层被压迫的妇女身上,关注她们的苦难命运.鲁迅在杂文中激烈地批判封建礼教强加在女性身上的道德规范的“节烈观”;深切地关注觉醒了的女性,为她们指明经济权的重要性;深刻地指出女性解放的艰难性和不彻底性,急切地唤醒女性的自我意识,鼓励女性为争得平等的社会地位和独立的人格与社会做“深沉的韧性的斗争”.     

某超高层建筑消防供水系统性能分析

对几种超高层建筑内部的分区供水方式原理及其优缺点进行了分析,以某超高层建筑为例,分析了消防给水系统的供水方式,以及此供水方式下系统的压力流量和组件的设置,并与《高层民用建筑设计防火规范》中的相关要求进行比较,分析在超高层建筑特有的供水方式下固定灭火设施的各项参数是否符合规范要求,为超高层建筑的消防给水设计提供了一定的借鉴和参考.     

A RANDOM RATIONING MECHANISM WHICH REDUCES THE RISKS OF NO SON LEFT AT HOME

This paper empirically re‐examines the long‐run co‐movements and the causal relationships between GDP and defence expenditures in a multivariate model with real defence expenditure per capita (ME), real GDP per capita (GDP), and real capital stock per capita (K). We apply the view of the aggregate production function to construct the empirical model. Using up‐to‐date data for 27 OECD countries and 62 non‐OECD countries for the 1988–2003 period, we combine cross‐sectional and time series data to re‐investigate the relationship between GDP and ME. Previous studies using time series data may have yielded misleading results on account of the short time span of typical datasets. By contrast, we use recently developed panel unit root tests and heterogeneous panel cointegration tests, and conclude that there is fairly strong evidence in favour of the hypothesis of a long‐run equilibrium relationship between GDP and ME. The long‐run panel regression parameter results, such as the fully modified OLS, indicate that a positive relationship between GDP and ME only holds for OECD countries, whereas a negative relationship from ME to GDP only exists in non‐OECD countries under examination and in the panel as a whole. Furthermore, by implementing the dynamic panel‐based error correction model, we determine that GDP and ME lack short‐run causalities, but do show long‐run bidirectional causalities in both OECD and non‐OECD countries.     

餐饮废油甘油酯法合成烷醇酰胺

以餐饮废油为原料,采用甘油酯法制备表面活性剂脂肪酸二乙醇酰胺。通过均匀实验确定最优合成反应条件:反应温度200℃,餐饮废油与二乙醇胺质量比1.3∶1,反应时间330 min。在此条件,油脂转化率为98.3%,产物的胺值和pH均达到国家标准要求。产物具有良好的表面活性,并可作为中间产物用于进一步加工。