群体决策过程组织研究述评

群体决策研究作为决策理论研究的热点和前沿在国内外方兴未艾, 尚未形成一个完整的 理论体系. 作者结合近年来在群体决策, 特别是在决策过程研究方面所做的一些工作, 以决策 过程研究为侧重点对群体决策理论研究进展进行了评述, 并通过社会选择理论和集体决策理 论的比较, 对群体决策的研究框架作了一些尝试性的探讨.     

R2的复活——股价同步性研究评述与展望

R2是最近十几年迅速发展的一个研究课题,其研究取向从纯粹的计量经济学符号演变为股价同步性特征变量,并与公司特质信息含量联系起来,赋予了全新的内涵.学者们通过跨学科的交叉与融合,从法与金融理论、委托代理理论、信息不对称理论、公司治理理论等视角对R2背后的生成机制、作用渠道和影响后果展开富有成效的研究.本文首先梳理从资产定价模型到R2,再从R2到股价同步性中间的学理关系和因果顺承,接着回顾了关于R2形成机理与经济后果的相关讨论,然后对R2的学术争论进行总结和评述,最后就R2的溯源问题、以及文化与政治潜在影响对未来R2研究提出展望.     

货币政策对M2的动态效应时滞分析及危机效应测算

科学测算金融危机期间已出台货币政策对货币供应量M2的效应时滞和贡献程度具有一定的现实价值。文章利用Markov状态转换及HP滤波模型识别不同货币政策状态的时间区间;利用多项式滞后分布模型分析政策工具变量对货币供应量影响的滞后效应,并以此为先验信息,建立了货币政策的Bayesian-PDLS动态效应分布模型,对金融危机期间已出台的货币政策效果进行了实际测算。主要结果表明:(1)外汇储备为M2的决定性因素,存款准备金率为M2主要的限制性因素;(2)货币政策变量M2总体对利率的弹性变化呈"U"型分布;在紧缩型情况下M2对利率的弹性变化呈"W"型分布;在扩张情形下M2对利率的弹性变化呈"v"型分布。     

中小企业应用B2B电子商务绩效分析

中小企业的规模小、资金少等特点,决定了使用第三方B2B平台开展电子商务是其最佳选择,但由于很多中小企业对电子商务认识不足,导致电子商务绩效并不理想。本文通过理论和案例分析,分析了中小企业使用B2B的现状和影响因素,试图找出中小企业电子商务绩效不理想的主要原因,并提出一系列对策。     

企业信息化与面向竞争的信息系统开发

本文在分析J2EE技术特点、中小企业信息化与信息系统建设的意义以及中小企业信息系统的构成内容的基础上,提出了一个基于J2EE的面向竞争的中小企业信息系统开发模式框架结构,并给出了面向竞争的中小企业信息系统建立与完善的若干建议。     

行业自律机制下P2P网贷平台违规治理演化博弈

行业自律是政府“强监管”背景下P2P网贷平台违规治理的重要组成部分。为揭示行业自律机制下网贷市场主体间行为策略关系及其动态演化机理,建立了包括自律监管平台、网贷平台和平台客户三方主体的行为策略演化博弈模型,分析三方主体行为策略演化路径及其联动作用规律,并结合数值仿真讨论不同约束情景下模型系统演化均衡状态及关键因素影响。结果表明：网贷平台合规运营意愿会随激励水平、形象效应、客户流失量、行业危机风险的上升而增强。若网贷平台拥有较完善运营机制、较好口碑形象或较大客户规模,其更易实现基于市场途径的自我规制。违规惩罚力度、形象效应收益及平台客户规制策略敏感性会直接影响网贷平台合规运营趋势。结合仿真分析结果,提出了加大对违规平台的惩罚力度,强化平台信息披露与品牌形象建设,引导借贷双方理性选择入驻平台等治理建议。     

The Hamming distances of saturated asymmetrical orthogonal arrays with strength 2

Abstract

Orthogonal arrays have many connections to other combinatorial designs and are applied in coding theory, the statistical design of experiments, cryptography, various types of software testing and quality control. In this paper, we present some general methods to find the Hamming distances for saturated asymmetrical orthogonal arrays (SAOAs) with strength 2. As applications of our methods, the Hamming distances of SAOA parents of size less than or equal to 100 are obtained. We also provide the Hamming distances of the SAOAs constructed from difference schemes or by the expansive replacement method. The feasibility of Hamming distances is discussed.     

Performance characteristics of the adjusted r2 algorithm for determining the start of the terminal disposition phase and comparison with a simple r2 algorithm and a visual inspection method

The adjusted r² algorithm is a popular automated method for selecting the start time of the terminal disposition phase (t_z) when conducting a noncompartmental pharmacokinetic data analysis. Using simulated data, the performance of the algorithm was assessed in relation to the ratio of the slopes of the preterminal and terminal disposition phases, the point of intercept of the terminal disposition phase with the preterminal disposition phase, the length of the terminal disposition phase captured in the concentration‐time profile, the number of data points present in the terminal disposition phase, and the level of variability in concentration measurement. The adjusted r² algorithm was unable to identify t_z accurately when there were more than three data points present in a profile's terminal disposition phase. The terminal disposition phase rate constant (λ_z) calculated based on the value of t_z selected by the algorithm had a positive bias in all simulation data conditions. Tolerable levels of bias (median bias less than 5%) were achieved under conditions of low measurement variability. When measurement variability was high, tolerable levels of bias were attained only when the terminal phase time span was 4 multiples of t_1/2 or longer. A comparison of the performance of the adjusted r² algorithm, a simple r² algorithm, and t_z selection by visual inspection was conducted using a subset of the simulation data. In the comparison, the simple r² algorithm performed as well as the adjusted r² algorithm and the visual inspection method outperformed both algorithms. Recommendations concerning the use of the various t_z selection methods are presented.     

专科生《21世纪大学英语》的教学改革

分析了《21世纪大学英语》教材的特色,以本套教材为突破口,分别从词汇教学,基础知识教学与激发学习动机,培养基本写作能力三个方面提出了针对专科学生英语教学的新思路和方法。