频偏条件下基于循环平稳的定时估计算法

研究了利用信号的循环平稳统计特性提取定时误差的估计算法,由于性能的优良是建立在大量统计信息的基础上,因而所需的观测时间长度较大,同时算法受频偏的影响也随观测时间长度的增大而增大。针对该特点,研究了频偏对算法性能的影响及存在频偏环境下算法中参数的选择。仿真结果表明,频偏对该类算法的影响不可忽略,尤其是在观测时间长度较大的情况下。实用中应结合具体频偏大小,合理选择参数取值。     

基于KSC-1000TG的面阵CCD相机时序驱动系统设计

CCD相机驱动系统是CCD相机的重要组成部分,它主要由时序驱动系统和电源驱动系统组成。本文主要介绍CCD专用时序驱动芯片KSC-1000TG的主要特点与性能参数,设计了一种基于KSC-1000TG的CCD时序驱动系统,并且对该系统进行了硬件电路设计和软件仿真,并在实际电路中对该系统进行了测试。测试结果表明,该设计方案的CCD驱动时钟频率达到22.9MHz,数据输出率达0.9帧/s,完全满足CCD的驱动需求。     

Financial incentives to work: A quasi‐experimental analysis of in‐work cash benefits for single mothers

This study examined the effectiveness of a voluntary welfare‐to‐work programme nationally implemented in Israel in 2003 and 2004. The programme included temporary in‐work benefits in the form of cash bonuses for single mothers who were receiving Income Support Benefits in 2003, when a far reaching change in the Income Support Scheme was implemented. The study focused on the effect of the bonuses on employment rate, earnings, earnings improvement and welfare exit. Based on administrative data and Propensity Score Matching, the evaluation included all single mothers who participated in the voluntary programme and a comparison group of eligible single mothers who did not participate. The programme had a positive long‐term effect on employment, earnings and earnings improvement among single mothers. However, it had no effect on their rate of exit from the Income Support Programme.     

Improved Simulation Techniques for First Exit Time of Neural Diffusion Models

We consider the fixed and exponential time-stepping Euler algorithms, with boundary tests, to calculate the mean first exit times (MFET) of two one-dimensional neural diffusion models, represented by the Ornstein–Uhlenbeck (OU) process and a stochastic space-clamped FitzHugh–Nagumo (FHN) system. The numerical methods are described and the convergence rates for the MFET analyzed. A boundary test improves the rate of convergence from order one-half to order 1. We show how to apply the multi-level Monte Carlo (MLMC) method to an Euler time-stepping method with boundary test and this improves the Monte Carlo computation of the MFET.     

Through an Interdisciplinary Mirror: Attorney-Therapist Similarities

Abstract

Self-help books often advise readers to avoid rushing into new relationships after a break-up. To date, there is little evidence supporting this recommendation. This paper tests the effects of rebound time, measured as time elapsed between marital dissolution and the formation of a new union, on remarriage duration. Data from the first wave of the National Survey of Families and Households and generalized additive models reveal no evidence of a rebound effect. This finding holds after adjusting for various demographic differences between respondents.     

民办学校市场退出立法价值偏差及其修正

我国民办学校的市场退出立法价值选择存在偏差,主要表现为民办学校市场退出立法强调宜缓不宜快,主张宜粗不宜细,重公法轻私法,重实体轻程序。纠正上述偏差要求必须重视民办学校市场退出立法的及时性,增强立法的可操作性,加强立法的私法性和完善立法的程序性。     

From Bottom of the Barrel to Cream of the Crop: Sequential Screening With Positive Selection

In a number of interesting environments, dynamic screening involves positive selection: in contrast with Coasian dynamics, only the most motivated remain over time. The paper provides conditions under which the principal's commitment optimum is time consistent and uses this result to derive testable predictions under permanent or transient shocks. It also identifies environments in which time consistency does not hold despite positive selection, and yet simple equilibrium characterizations can be obtained.     

Fear of Miscoordination and the Robustness of Cooperation in Dynamic Global Games With Exit

This paper develops a framework to assess how fear of miscoordination affects the sustainability of cooperation. Building on theoretical insights from Carlsson and van Damme (1993), it explores the effect of small amounts of private information on a class of dynamic cooperation games with exit. Lack of common knowledge leads players to second guess each other's behavior and makes coordination difficult. This restricts the range of equilibria and highlights the role of miscoordination payoffs in determining whether cooperation is sustainable or not. The paper characterizes the range of perfect Bayesian equilibria as the players' information becomes arbitrarily precise. Unlike in one‐shot two‐by‐two games, the global games information structure does not yield equilibrium uniqueness.     

利用AD574A设计基于FPGA的高速数据采集系统

在分析FPGA数据采集控制系统结构与工作原理的基础上,利用AD574A作为控制器,构建了一种基于FPGA的数据采集系统。该系统的核心电路,包含控制器、内嵌双口RAM、地址计数器3个模块,结合模数转换器件AD574A构成高精度、快速采集、存储控制系统。可以通过单片机或DSP进行数据的后续处理。并在Quartus II平台下实现FPGA内部3个功能模块,给出了时序仿真波形图。     

Early retirement differences between Denmark and The Netherlands: A cross-national comparison of push and pull factors in two small European welfare states

The goal of this study is to give a comprehensive empirical account of push and pull factors, situated at various societal levels, which may influence people's early retirement. Factors in two contrasting European countries have been analysed and compared: Denmark, where the rate of early exit/retirement is relatively low, and The Netherlands, where this rate is relatively high. Our analysis, looking into possible explanations for the difference in rates, includes factors that operate at the macro or institutional level of the labour market and the social security system, at the meso level of firms and companies, and at the micro level of individual workers. In addition, we not only look into the effects of structural, objective factors, which impacts are usually analysed from an incentive perspective, but also into the effects of cultural factors, i.e. of preferences, attitudes and values. Cultural factors related to early exit have not been the object of much international comparison thus far, although their possible significance is readily acknowledged. The differences in retirement behaviour in Denmark and The Netherlands are explained by the fact that Danish workers, at all three levels, are less experiencing structural and cultural factors pushing them out of the labour market, as well as experiencing factors pulling them into retirement, compared to workers in The Netherlands.