评审专家抽取中的时间距离约束分析

针对现有评审专家抽取中距离约束存在的不足,本文提出了一种新的时间距离约束。本文介绍了时间距离的含义及其提出的必要性,并给出了基于GIS技术的时间距离计算方法,具体包括相关假设、计算步骤、解决方案以及实现过程。时间距离约束的提出不仅可以保证所有被选专家都可按时到达评审地点,而且还能打破行政区域的限制,合理调配专家资源,具有重要的现实意义。     

一种利用短时DFT分析实现全数字2DPSK接收机解调的新算法

本文提出了一种简单而实用的利用短时DFT（ST-DFT）分析实现全数字2DPSK接收机的解调算法。该算法对由多谱勒效应引起的时变频率漂移具有鲁棒性。由于该算法是通过检测在载频处的瞬时能量谱的跳变来实现2DPSK信号的解调，所以该算法不需要进行专门的载波相位恢复、符号定时，且具有较好的抗噪性能，实现起来简单。     

未确认融资费用的实际利率摊销法研究——资金时间价值轴上的全新思路

本文从财务管理时间价值角度阐述未确认融资费用如何合理分摊的问题,提出了与一般会计实务教材标准解法完全相反的思路,得到了相同的效果,并对两种解题思路作了详细的比较分析,并在此基础上提出有关会计计量的若干假说。     

Karl Pearson and the Scandinavian School of Statistics

The relationship between Karl Pearson and the Scandinavian statisticians was more of a competitive than a collaborative nature. We describe the leading statisticians and stochasticists of the Scandinavian school, and relate some of their work to the work of Pearson.     

幂级数的除法

本文从复变函数展开为幂级数的待定系数法出发,提出了幂级数的除法的概念,并给出了幂级数的除法的运作方式,从而有效地解决了待定系数法比较繁杂这一困难,同时保证了运算结果的准确性。     

Comparing the accuracy of several network-based COVID-19 prediction algorithms

Researchers from various scientific disciplines have attempted to forecast the spread of coronavirus disease 2019 (COVID-19). The proposed epidemic prediction methods range from basic curve fitting methods and traffic interaction models to machine-learning approaches. If we combine all these approaches, we obtain the Network Inference-based Prediction Algorithm (NIPA). In this paper, we analyse a diverse set of COVID-19 forecast algorithms, including several modifications of NIPA. Among the algorithms that we evaluated, the original NIPA performed best at forecasting the spread of COVID-19 in Hubei, China and in the Netherlands. In particular, we show that network-based forecasting is superior to any other forecasting algorithm.     

2008: Golden Time in Gold Market

Pushed by increased demand from both jewelers and investors, China has become the drivin, g force behind the world's gold market in 2007. Chinas gold market this year has maintained its growing momentum with booming demand, not only in the domestic market but also in the international market.     

The Persistence of Profits in the Long Run: A New Approach

We present a trend‐based alternative to the standard first‐order autoregression model in persistence of profits studies. This is motivated by reservations over the interpretation of the standard model, and rests on a different concept of dynamic competition. A nine‐category taxonomy of long‐run persistence stereotypes is developed. Structural time series estimates are presented for a sample of UK companies. We find the null of long run competitive equilibrium not rejected in nearly a third of cases, but non‐eroding persistence to be present in around 60%.     

社会治理支出与经济增长：抑制还是促进？

本文基于1990—2012时间序列数据,对社会治理支出与经济增长进行 Johansen 协整和 Granger 因果检验,并进行了脉冲响应分析和方差分解。为了弥补时间序列数据只包含时间和指标两维信息的缺陷,进一步基于2000—2012年中国31省域面板数据,对二者进行了面板数据单位根检验、协整检验和固定效应变系数模型估计分析。研究结果表明,社会治理支出会促进经济增长,而经济增长对社会治理支出促进作用十分有限,各省域社会治理支出对经济增长促进作用不尽相同。     

演化视角下全产业链创新网络结构及核心企业行为对创新绩效的影响——以苹果公司网络为例

从理论上分析了全产业链创新网络结构特点以及核心企业行为模式与创新绩效的关系,提出相关假设;从开放性的2个维度,即开放广度和开放深度量化核心企业开放式创新的行为模式。依据偏最小二乘法,将结构和行为模式的表征变量作为自变量,创新绩效的4个表征变量作为因变量,进行交叉检验;最后选取1个主成分进行回归分析,检验理论假设。