论微博问政对公共政策制定的影响

伴随着微博渐趋平民化与大众化,微博问政这一“民间舆论场”受到网民青睐.微博问政对公共政策的制定利弊皆存：它有利于推动社会问题进入政策议程,维护政策合法化,促进政策制定的民主科学化；但由于虚假信息过多、利益集团、国外敌对势力的干扰、数字鸿沟的差异使得微博问政给公共政策制定也带来消极影响.本文将立足阐述微博问政兴起的背景与发展现状,分析其对公共政策制定的利弊,最后将探讨提升微博问政在公共政策制定中效能的路径.     

公文流转中文件安全传输的技术实现

为进一步提高办公效率，实现中央银行与银行业金融机构之间公文高效、安全传递，本文简要介绍了金融机构间公文传输中所涉及的安全技术：PKI（公钥设施基础）基本概念、基本组成、基本运行模式以及RSA算法，并设计了金融专网间公文安全的传输技术方案。     

基带成形滤波器的FPGA实现

针对数字化基带成形滤波的信号处理特点，将截短的基带波形进行二维分解，得到成形滤波器的多相结构。通过对多相结构的分析，给出了一种较为精简实用的基于滤波器系数查询表模式的FPGA实现结构，该结构具有实现简单、占用资源少等特点。仿真结果表明，该结构完全可以达到实际应用的要求。     

Socio-technical challenges in the development of digital multimedia broadcasting: A survey of Korean mobile television development

This paper examines the prospectus of Digital Multimedia Broadcasting from the technical, economic and regulatory issues. This paper attempts to gain a better understanding of how DMB will evolve and stabilize in next generation network environments. Two research questions guide this study: (1) How does DMB trigger a change in policy, market and industry structure? (2) What are the driving forces of the rapid DMB development in Korea? As these questions involve socio-technical issues, this study uses a socio-technical perspective to investigate the complex relations between the social and technical aspects of DMB by highlighting the co-evolving nature, diversity, and interface between different driving forces and policy. The finding is that Korean DMB is the outcome of a proactive strategy of a telecom carrier and the Korean government's industrial policy to support such strategy. Among the push-oriented trajectory, however, non-technical issues such as users, market and regulation are left behind, which reveals the disjunction of the DMB development in terms of the socio-technical system perspective. The development of DMB sheds light on the growing challenges in the dynamics of industry, regulation, and technology.     

高速数字信号处理采集数据的存贮

本文针对高速数字信号处理技术中存在的数据接口问题,分析了几种数据存贮结构,在此基础上给出了一种性能/价格比较优的总线隔离的数据存贮器直接存贮数据接口结构。     

A system approach for measuring the euro area NAIRU

This paper addresses the issue of measuring the NAIRU for the euro area and assessing the robustness and precision of the obtained estimates. The empirical framework adopted is based on systems combining an Okun-type relationship between cyclical unemployment and the output gap with a Phillips curve and stochastic laws of motion for the NAIRU and potential output. Such systems have been estimated using Kalman-filter techniques. The results obtained point to an estimate of the area-wide NAIRU that is robust to changes in the underlying models. This robustness is shown to hold both in terms of the mean – i.e., the shape of the resulting NAIRU – and the variance of the process. The latter is derived through bootstrap exercises using the models alone or pooled together. The evidence found suggests that the increase in the aggregate NAIRU that took place in the early part of the sample period has come to a halt and may be about to be reversed.Jel classification: C11, C15, E31, E32The opinions expressed in this paper are those of the authors and do not necessarily reflect the views of the Institutions they belong to. The authors are grateful to Per Jansson for providing parts of the econometric RATS code and to Gonzalo Camba-Mendez and Frank Smets of the ECB for useful comments. Comments and recommendations by two anonimous referees are also gratefully acnowledged. All the remaining errors are the authors responsibility. All correspondence to Ricardo Mestre.First version received: January 2002/Final version received December 2002     

码移键控系统的性能分析

讨论了码移键控(CSK)基本原理、基于数字匹配滤波器(DMF)的快速捕获结构和用相关乘法器代替数字匹配滤波器的快速捕获结构,并对CSK系统的接收性能进行数学分析,得到了数据码错误率公式。     

Excel“高级筛选”功能之条件区域设计新解

通过对 Excel“高级筛选”功能的分析 ,提出了一种新的条件区域设计规则 :1 )筛选条件中涉及的字段名写在同一行 ;2 )条件值写在相应字段名下面 ,若字段间是“与”关系 ,条件值写在同一行 ;若字段间是“或”关系 ,条件值写在另一行 ;3 )条件区域设计好后应按行读 ,行与行之间是“或”关系。该规则简单易行 ,简化了高级筛选操作 ,扩展了 Excel的使用。     

住宅市场量价关系分析——基于香港数据的实证研究

本文基于滤波方法-9向量自回归模型，对香港十多年的住宅交易量和价格数据进行实证研究。结果显示，考察1996．1-1997．6区间的样本交易量与价格互为格兰杰因果关系，表现出正反馈效应，投机现象非常明显。但当选取1997．7-2007．7区间的样本则仅发现价格是交易量的格兰杰原因，并不存在双向因果关系。方差分解结果表明，交易量波动对于价格波动的影响要大于价格波动对于交易量的影响。     

Varying the VaR for unconditional and conditional environments

Accurate forecasting of risk is the key to successful risk management techniques. Using the largest stock index futures from 12 European bourses, this paper presents VaR measures based on their unconditional and conditional distributions for single and multi-period settings. These measures underpinned by extreme value theory are statistically robust explicitly allowing for fat-tailed densities. Conditional tail estimates accounting for volatility clustering are obtained by adjusting the unconditional extreme value procedure with GARCH filtered returns. The conditional modelling results in iid returns allowing for the use of a simple and efficient multi-period extreme value scaling law. The paper examines the properties of these distinct conditional and unconditional trading models. The paper finds that the biases inherent in unconditional single and multi-period estimates assuming normality extend to the conditional setting.