Monetary and fiscal policy interactions in the post-war U.S.

A New Keynesian model allowing for an active monetary and passive fiscal policy (AMPF) regime and a passive monetary and active fiscal policy (PMAF) regime is estimated to fit various U.S. samples from 1955 to 2007. The results show that data in the pre-Volcker periods strongly prefer an AMPF regime, even with a prior centered in the PMAF region. The estimation, however, is not very informative about whether the Federal Reserve's reaction to inflation is greater than one in the pre-Volcker period, because much lower values can still preserve determinacy under passive fiscal policy. In addition, whether a PMAF regime can generate consumption growth following a government spending increase depends on the degree of price stickiness. An income tax cut can yield an unusual negative labor response if monetary policy aggressively stabilizes output growth.     

城乡收入差距影响因素的非参数逐点回归解析

文章利用1987-2008年我国的相关统计数据构建了非参数面板数据模型,采用非参数逐点回归估计方法,估计了我国的教育投入、教育产出、城市化水平、经济开放度、产业结构和政府经济行为等变量对城乡收入差距的影响,刻画了各影响因素关于自变量系数的动态演进趋势。研究表明:各影响因素关于自变量系数的逐点估计结果共有四种类型:"倒U型"、"U型"、"上升型"和"下降型";各影响因素对缩小城乡收入差距都有积极的作用,但在不同时期所起的作用不同。     

全要素生产率、人民币汇率与中国贸易收支——基于跨期最优选择理论的实证研究

文章首先以跨期最优分析框架为基础建立以中国贸易收支为研究对象的理论模型,然后基于中国1999-2009年省际面板数据,运用面板FMOLS估计方法,从全国和地区两个层面对中国全要素生产率、人民币实际汇率与中国贸易收支的关系展开实证分析。研究表明,中国贸易部门内资企业和外资企业的全要素生产率提升均对中国实际贸易余额增长产生了正面影响,其中东部地区的促进作用最为强劲;中国非贸易部门全要素生产率与其实际贸易余额负相关,其中东部和中部地区非贸易部门全要素生产率提升会显著减少该地区的实际贸易差额;人民币实际有效汇率提升对中国实际贸易收支具有显著的负面影响,并按照东部、中部和西部地区依次加重。根据上述分析结果,文章提出了调节中国贸易收支的相关政策建议。     

政府在耕地减少中的责任和在耕地保护中的作为

集成曲线估计模型和灰色数列模型,研究耕地总量在1983-2006年间的变化过程以及在2010～2020年间的变化态势,分析政府行为在耕地总量减少中的责任和在保护耕地中的作为.研究结果:2020年耕地总量可能低于新的耕地红线,政府对耕地减少负有不可推卸的责任.     

Public spending,public governance and economic growth at the Vietnamese provincial level: A disaggregate analysis

This study examines the role of economic governance in the relationship between public spending, private investment, and economic growth in Vietnam at the provincial level. The study data consist of sixty-two Vietnamese provinces for the period 2006–2015. Some notable results are attained by applying a sequential (two-stage) estimation. First, the marginal benefits to economic growth of increased Vietnamese provincial government expenditures may be constrained because of the inefficiency of expenditures on education, business services, and public administration. Second, public spending and private investment are found to be substitutes at the provincial level. Third, based on the Provincial Competitiveness Index (PCI) ranking, used as a proxy for provincial public governance in Vietnam, the significance of public governance can be observed. The study concludes that good governance, characterized by different attributes, such as lower informal charges, greater transparency, and unbiased policy, plays a critical role in improving the impact of government expenditure on economic growth in Vietnamese provinces, particularly through its interactions with private sector investment.     

The Benefit Function Approach to Modeling Price-Dependent Demand Systems: An Application of Duality Theory

In this article, we advocate more extensive use of the benefit function in specifying price-dependent or inverse demand models. We demonstrate how duality theory may be used to establish the interrelationships between the Marshallian (or Hicksian) inverse demands and Luenberger's adjusted price functions, allowing estimable inverse demands to be derived directly from a benefit function. We estimate two systems of inverse demands for Japanese quarterly fish consumption. Results indicate that the procedures and methods employed here appear promising, and may prove beneficial for quantity and welfare analysis when modeling systems of inverse demand functions.     

基于Supermap和Google earth的城中村改造面积估算——以广州市海珠区为例

城中村多存在于经济发达的城市,广州是珠三角地区的发达城市之一,在广州市区内,共存在138个城中村。城中村的存在为广州市内广大的外来工作人员提供了价格低廉的住房。可是,近10年来,城中村的问题日益凸显,促使广州市政府对城中村进行大规模的整治和改造。对广州城中村的面积进行估算,能够得到广州城中村的面积、区位等数据。本文对广州城中村的面积估算方法进行探讨,并使用Supermap Deskpro软件和Google earth软件对广州市海珠区的城中村面积进行估算,从而了解广州城中村的规模、分布区位及其分布特征,为城中村的改造和整治提供基础数据。     

大频偏卫星扩频信号的基带处理算法的FPGA实现

多普勒频偏一直是卫星通信中不可忽视的消极因素。针对多路混叠的卫星扩频信号下变频以后所产生的大多普勒频偏,在匹配滤波结构中采取改进的部分相关算法,在基于并行导频的信道估计中根据信道状况改变估计长度,实现了大频偏下卫星扩频信号的基带处理。     

基于时域分割的DS/FH信号参数估计

针对时频分析方法在直扩/跳频(DS/FH)混 合扩频信号参数估计中存在时频分辨率受限、交叉项干扰、实时性差等缺点,通过分 析DS/FH信号的时频特性,提出了一种新的DS/FH信号参数估计方法。该方法从待测信号的时 域分析出发,利用不同跳频点对应的周期数不相等的性质,完成了对DS/FH信号的时域分割 ,最后结合DS/FH信号性质完成了对待测信号跳频周期、驻留时间、跳频频率的估计。仿真 结果表明,该方法针对DS/FH信号的参数估计精度高,运算速度较快,且没有干扰频率。     

一种改进的LTE系统下行同步算法

LTE（Long Term Evolution）系统中,作为小区搜索的第一步,符号定时算法需要具备很强的鲁棒性。为了进一步增强现有符号同步算法的抗频偏性能,提出了一种优化的符号同步算法。该算法一方面保持已有分段相关同步算法的优点,同时考虑结合预频偏处理来进行符号定时与粗频偏的联合估计,再将多个相关运算集做叠加处理。理论分析和仿真实验结果表明,在多径信道下,所提算法在完成符号定时和粗频偏估计的同时,大大提高了系统抗频偏性能。