建筑工程造价与工期的辩证关系

阐述了施工工期与造价的辩证关系。即：工期与经济效益的关系；工期与自然损耗的关系；工期与固定成本的关系；工期与投资成本的关系。     

A classification system for understanding individual differences in temporal orientation among processual researchers and organizational informants

This paper develops a classification system of temporal orientations in an effort to provide processual researchers with a framework for understanding the potential impact of temporal orientations on processual research methods and findings. In developing the classification system four general conceptions of time are reviewed, including physiological, objective, psychological, and socially constructed relative time. Specific dimensions of temporal orientation previously studied are identified, and additional dimensions are offered. It is suggested that temporal concerns are endemic to management and organizational processes, and that differences in temporal orientations among researchers and organizational informants should be considered when conducting processual research.     

Stackelberg leadership in a dynamic duopoly with stochastic capital accumulation

I propose a dynamic duopoly model where firms enter simultaneously but compete hierarchically á la Stackelberg at each instant over time. They accumulate capacity through costly investment, with capital accumulation dynamics being affected by an additive shock the mean and variance of which are known. The main findings are the following. First, the Stackelberg game is uncontrollable by the leader; hence, it is time consistent. Second, the leader invests more than the follower; as a result, in the steady state, the leader’s capacity and profits are larger than the follower’s. Therefore, the present analysis does not confirm Gibrat’s Law, since the individual growth rate is determined by the timing of moves.JEL Classification: C61, C73, D43, D92, L13Financial support within the project The post-entry performance of firms: technology, growth and survival lead by Enrico Santarelli, co-financed by the University of Bologna and MIUR, is gratefully acknowledged. I thank Uwe Cantner, Roberto Cellini, Roberto Golinelli, Helen Louri, Enrico Santarelli, Antonello Scurcu, Peter Thompson, two anonymous referees and the audience at the final workshop of the project (Bologna, November 22-23, 2002) for useful comments and discussion. The usual disclaimer applies.     

An assessment of value creation in mobile service delivery and the moderating role of time consciousness

This study focuses on the perceived utilitarian value of a new service delivery mode, the mobile channel. The authors develop a framework that incorporates three mode-specific benefits - time convenience, user control, and service compatibility - as well as two costs - perceived risk and cognitive effort - as antecedents of perceived value. Because of the pervasiveness of time criticality as a value-added characteristic of the mobile channel, they also investigate the moderating influence of consumers’ time consciousness. They empirically investigate the model using mobile brokerage services as an illustrative application. The results reveal that the identified antecedents, with the exception of service compatibility, have a strong impact on mobile channel value perceptions, which in turn influence behavioral intentions. The authors also find that time consciousness moderates the aforementioned relationships.     

用时延编码实现远程水声通信

本文研究了一种基于时延编码的远程水声通信技术，该技术利用线性调频（LFM）信号矩形脉冲的时延值进行时延编码，在接收端采用时延估计技术进行时延解码。初步的海试结果表明，该技术可以实现80km距离、4.16bit/s数据率的信息可靠传输。     

基于并行判决法的PCTH-UWB系统性能分析

伪混沌跳时序列(PCTH)最近提出应用于UWB系统。本文分析了PCTH-UWB的工作原理,提出了并行判决法,与直接判决法进行了比较,理论分析及仿真结果表明并行判决法可提高PCTH-UWB系统性能。     

人民币实际汇率变动与中等技术产品出口结构——基于空间状态模型的研究

应用ARCH模型和空间状态模型估计人民币实际汇率变动及其对中等技术产品出口结构的影响。实证结果表明：人民币实际汇率变动符合2阶自回归模型,汇率变动方程是ARCH（2）形式;随着中国中等技术产品出口结构的不断优化和人民币汇率市场化程度的加深,人民币实际汇率变动对中等技术产品出口的影响逐渐由负向转变为正向推动作用。因此,进一步完善人民币汇率制度,适度增加人民币汇率的浮动幅度和升值空间,对我国淘汰落后产业,推动出口结构升级,增强出口商品的国际竞争力有重要的促进作用。     

“以人为本”执政理念的时代价值

我党"以人为本"执政理念的提出有着深刻的时代价值。其时代价值表现在:一是"以人为本"执政理念反映了社会发展的新走向;二是"以人为本"执政理念回应了中国发展的新机遇和新挑战;三是"以人为本"执政理念体现了中国特色社会主义的内在要求;四是"以人为本"的执政理念顺应了全面建设小康社会的必然要求。     

Innovation dynamics in the EU: convergence or divergence? A cross-country panel data analysis

This paper investigates whether a convergence or divergence of national innovation capabilities of the 15 EU countries occurs in the course of time. An answer to this question permits immediate conclusions with regard to the success prospects of a convergence of per capita incomes and labor productivities within the EU. For the empirical analysis based on patents granted at the US-Patent and Trademark Office, unit root tests for time series and panel data are used to scrutinize the convergence hypothesis. Taking all results together, evidence points to the fact that an absolute convergence of innovation capabilities is an exception. However, for a number of countries the results suggest either conditional convergence or convergence to their own growth paths.

中国房地产周期波动研究----一个基于时序全局主成分方法的分析

在现有的关于我国房地产周期波动的研究中,所使用的研究工具大多都不能深入刻画我国房地产的周期波动规律和影响我国房地产周期波动的主成分。为此,我们利用时序全局主成分这一新方法,研究了自1998年-2008年我国房地产周期波动情况及其主成分。我们发现,自1998年第四季度至2008年第3季度,我国房地产增长周期大概经历了两个完整的周期,他们分别是1999年1季度到2003年4季度,2004年1季度到2007年4季度,2008年开始我国房地产进入了向下调整的过程中。从主成分的综合影响度来看,对房地产业增长率影响较大的因素依次是：完成开发投资额增长率、施工面积增长率、空置面积增长率、人均收入水平增长率、GDP增长率、消费水平增长率、销售价格增长率、建筑贷款增长率、广义货币供应M2增长率。而其他因素的增长率对房地产业的综合影响较小。