时延测量方法的分析与比较

介绍了5种测量时延的先进方法。通过对这些方法的深入分析和大量实验，得出了这些方法的最佳测量不确定度。同时还提出了“时延传递标准”的新方案，该方案的测量不确定度可达0．01—0．02ns。     

WCDMA 移动终端用RAKE接收机结构与实现

针对WCDMAFDD下行链路,提出了一种接收机结构。与传统接收机不同,该结构是根据多径来拉动(延时)输入信号,即根据多径把各径的信号延时对齐,而本地码的相位只需一个,来对多径支路解扩,并直接合并输出。该结构可进一步通过串行方法实现,大大减少硬件资源。由于采用全硬件技术,因此,便于ASIC集成。     

变质物品考虑资金时值和滞后支付时的库存研究

研究了变质物品在考虑资金时间价值并且采购费允许滞后支付时的最优经济订货批量问题。建立了变质物品在需求率为库存水平的线性函数,计划时域内允许缺货且短缺量完全拖后,并且考虑资金的时间价值和采购费允许滞后支付时的最优库存决策模型。给出了模型最优解存在的必要条件和求解算法,通过一个算例说明了模型的求解过程。     

单点信号交叉口通行能力和服务水平分析

本文分析了单点信号控制交叉口通行能力和服务水平的影响因素 ,揭示了交叉口通行能力与延误随信号周期长度变化的规律 ,从而得出交叉口延误最小、通行能力最大的信号周期的取值范围 ,提出了交叉口饱和度接近饱和或过饱和时的交通管理措施     

On the timing of information release

We consider a simple principal-agent model in which moral hazard concerns can make it attractive to delay the release of valuable planning information. We also demonstrate that temporary manipulation of the content of the information released can be valuable.     

基于模糊控制的城市交叉路口智能交通系统研究

文中根据模糊控制理论对交叉路口的交通控制进行优化。路权相位的切换按各路口的等待车流量大小顺序排列,车流量较大的相位优先通行。绿灯时间根据各路口车流量差异合理分配,以实现平均延误时间最小化,同时兼顾公平。     

Inventory ordering policies of delayed deteriorating items under permissible delay in payments

The existing literature on inventory of deteriorating items considers deterioration to begin as soon as the items are stocked. However, there are several deteriorating items that do not start deteriorating immediately they are held in stock. Some farm produce like potatoes, yams and even some fruits and vegetables have this property. Depletion of these items as soon as they are stocked will depend on demand, and when deterioration begins, it will depend on both demand and deterioration. In this paper, we develop a mathematical model on the inventory of deteriorating items that do not start deteriorating immediately they are stocked. The model also takes into cognizance the fact that in business activities nowadays customers are given some allowed period within which to settle for the goods supplied to them. They can use the accrued money from sales of the supplied goods to earn interest within the allowed period. They are charged interest only when they fail to settle the amount they owe the supplier at the end of the allowed period.     

The Economic Impact of Capital Expenditures: Environmental Regulatory Delay as a Source of Competitive Advantage?

This study tests the proposal that by undertaking voluntary capital expenditures that are subject to lengthy environmental regulatory delays, listed companies can gain a competitive advantage. The stock market is found to react positively to new capital expenditure announcements when projects are expected to experience long delays in obtaining environmental regulatory approval. Two sources of potential competitive advantage are firm learning and first mover advantages. Lengthy delays in regulatory processes and high compliance costs incurred for environmentally‐sensitive projects may allow firms opportunities to develop specialised capabilities and/or to deter industry competitors and new entrants, resulting in greater expected project NPVs. The findings also underscore the importance of non‐financial environmental information to investors in their assessment of firm value.     

一种通信卫星在轨测试中群时延特性测量方法及工程实现

讨论了群时延的概念及群时延的测试原理和方法,并在通信卫星在轨测试的工程实现中,针对卫星转发器频段多及Ka频段转发器频率较高的特点,重点描述了综合群时延测试的方案设计及实现。经工程验证,该方法提高了在轨测试的效率和群时延测试精度。     

一类二阶非线性变时滞微分方程解的有界性

借助辅助函数讨论了一类二阶非线性变时滞微分方程解的有界性。