Fiscal policy,government size and EMU business cycle synchronization

We provide new evidence on the effects of fiscal policy and government size on pairwise business cycle synchronization in EMU. A novel time-varying framework is employed to estimate business cycle synchronization and subsequently a panel approach is used to establish the role of fiscal variables in determining the pairwise synchronization observations across time. The findings suggest similarities in the size of the public sector, yet divergence in fiscal policy stance, matter for the determination of business cycle synchronization. Hence, increased fiscal federalism in EMU will contribute to increased business cycle synchronization. Our results remain robust to different specifications and sub-periods.     

一种采用可变同步帧的OFDM符号定时同步算法

符号定时同步是正交频分复用（Orthogonal Frequency Division Multiplexing,OFDM）系统中最为关键的同步之一。针对现有的基于数据辅助类的同步算法中帧头存在持续时间长、抗噪声性能差和对载波频偏敏感等问题，提出了一种可变长度的同步帧结构，采用滑动差分相关算法完成符号定时同步。仿真结果表明，提出的同步帧结构持续时间短于一个OFDM符号周期，并且训练序列长度可以通过估算信噪比大小而灵活控制。同时，所提算法在归一化载波频偏为12（远远超过晶振的误差范围 ±10-5）的情况下正常工作；在高斯白噪声和多径衰落信道中都有较好的性能，且其流水线结构易于硬件实现。     

用于散射信道的多业务异步复分接技术

为扩大散射信道传输容量和提高其传输效率,在多种时钟业务传输过程中,可采用多业务异步复分接技术。根据极低速散射通信系统的特点,在进行业务复分接时为了改善帧同步,论文提出使用Turbo码帧同步算法,该算法不需要插入任何导频符号,利用信道码字特征和译码的迭代信息辅助系统完成帧同步,提高了系统的帧同步精度及传输效率。     

等效时移随机共振的载波同步

针对随机共振应用于单频载波同步时存在的噪声能量转化不彻底、采样点数量需求高的问题,提出了随机共振等效时移的载波同步方法。首先,通过充分利用接收信号的先验信息,设计样点等效时移过程,降低了载波同步对采样率的需求;其次,通过设计多级迭代的随机共振系统,并设置本地同频方波信号,提高了噪声的转化效率;最后,给出了较为完整的时移校准和时延校准的模块设计。理论分析和仿真结果均表明该方法能够有效地实现载波同步,并较现有方法提高约10 d性能。     

低信噪比下突发通信的同步检测

针对低信噪比下突发通信系统的同步检测问题,提出了一种利用接收信号平均信噪比和瞬时信噪比设置动态检测门限的同步方法,实现了信号检测门限的设置与信号脉冲出现时刻噪声能量的自适应匹配,提高了低信噪比下同步检测概率。计算机仿真表明在同步序列长度为63时,信号的有效检测工作信噪比可以降低到-5 dB。该方法适合于低信噪比下运动平台间的突发通信系统。     

企业如何有效开展研发与标准化同步工作

随着企业对标准化工作的不断重视，研发与标准化同步正成为企业标准化工作的重点。文章在总结实践经验的基础上，从开展研发与标准化同步的意义，开展该项工作的资源保障，主要开展的内容以及开展效果的评价等方面进行了阐述，为企业有效开展研发与标准化同步工作提供了有益的借鉴。     

适用于多速率高阶QAM的定时同步改进算法

针对速率可变的高阶正交幅度调制(QAM)信号定时同步问题，提出了一种基于Gardn er理论的定时同步改进算法。新算法改原有滤波器结构为两级插值级联优化结构来实现多速 率信号的定时同步，可独立于载波同步单独使用，比传统结构具有更强的普遍适用性。仿真 结果表明，该算法可以准确地对速率可变的128QAM信号进行同步。     

Nonuniform Staggered Prices and Output Persistence

Staggered prices are a fundamental building block of New Keynesian dynamic stochastic general equilibrium models. In the standard model, prices are uniformly staggered, but recent empirical evidence suggests that deviations from uniform staggering are common. This paper analyzes how synchronization of price changes affects the response to monetary policy shocks. I find that even large deviations from uniform staggering have small effects on the response of output. Aggregate dynamics in a model of uniform staggering may serve well as an approximation to a more complicated model with some degree of synchronization in price setting.     

A comparative analysis of stock market cycles

In this article, we date the ‘recession’ and ‘expansion’ phases of 46 stock markets around the world from December 1994 to September 2013. We use the Harding and Pagan methodology to identify peaks and troughs in these stock market indices. This approach enables us to establish periods of synchronization between the markets based on the timing of peaks and troughs and to measure this synchronization by means of the Harding and Pagan statistic. We find that several recent world crisis episodes and simultaneous recoveries can be identified with this method. We also present evidence demonstrating an increase in the pro-cyclicality of stock markets around the world.     

Synchronization of Innovation and Vehicle Projects: Proposal of a Management Tool at Renault SAS

The success of a vehicle on the market depends on its price, reliability, and attractiveness; for the latter, innovations are the key elements in the differentiation from competitors. Managing the processes of selecting and integrating innovation projects into vehicle projects is therefore crucial. This article presents a management tool that aims at managing the interplay between innovation projects and vehicle projects. The objectives are to increase and optimize the amount and value of innovation projects integrated into vehicle projects. The tool, called “Profilor,” is based on the concept of intrusiveness, which is presented from a theoretical and empirical point of view.