中国股市波动性研究——基于Shiller-Sentana-Wadhwani模型

股票市场的价格波动并非像传统金融学所说得那样围绕公司基本价值进行小幅震荡，常常表现出大幅波动的特征。本文采用基于garch模型作出的Shiller-Sentana-Wadhwani模型对中国股票市场成立十多年的股价波动进行实证研究，得出中国股票市场存在反馈交易且其程度随着股价波动的增大而提高、随着涨跌限制而加大的结论。     

中国房地产泡沫与非泡沫--以投机理论为基础的实证分析

文章在对当前房地产泡沫若干观点作简单综述和对房地产泡沫定义辨析的基础上,建立了房地产投机泡沫检验模型,并对中国房地产业泡沫性与非泡沫性进行了实证研究,最后得出当前中国房地产业不存在投机泡沫的结论。     

Positive feedback trading and long-term volatility links: evidence from real estate markets of USA,Be/Lux and Switzerland

This article investigates the positive feedback trading strategies in the real estate markets of USA, Belgium/Luxembourg (Be/Lux) and Switzerland, linking these strategies with long-term volatility. The results are in favour of a positive feedback trading strategy which negatively influences investors' risk-return position on real estate markets.     

农村老年人代际经济反馈的影响因素分析——基于CHARLS全国基线调查数据

农村老年人代际经济反馈是本土化家庭养老研究领域的重要问题。论文运用"中国健康与养老追踪调查"(CHARLS)全国基线数据,以亲子两代分居家庭为研究对象,通过非条件logistic模型,分析了微观领域影响农村老年人代际经济反馈的因素。研究结果表明:在个体因素层面,年龄对代际经济反馈呈现正向显著性影响,受教育程度则为负向显著性影响;在家庭因素层面,子女数量以及对孙辈的投资状况等因素对农村老年人代际经济反馈存在着正向显著性影响。基于数据结果,论文提出了加强对农村高龄老年人的关注、加快农村养老制度建设以及积极提升家庭发展能力等对策。     

When Feedback Interventions Backfire: Why Higher Performance Feedback May Result in Lower Self‐Perceived Competence and Satisfaction with Performance

In relative performance evaluation systems, appraisers may choose to adopt stricter or laxer evaluation criteria. When laxer (vs. stricter) criteria are used, higher absolute performance evaluations become easier (vs. harder) to achieve. Thus, each appraisee's absolute performance feedback and the mean of the distribution of absolute performance feedback are shifted upward (vs. downward). Yet, relative performance remains constant. When evaluation outcomes depend solely on relative performance, can the adoption of laxer (vs. stricter) criteria—leading to higher absolute performance feedback but no change in relative performance—influence appraisees’ satisfaction with performance? Despite the ubiquity of such systems in organizations, research has not addressed this question. This article points to an important gap between practitioners’ beliefs and research findings. We show that while most appraisers believe that higher absolute performance feedback will automatically result in more satisfaction with performance, the opposite may also happen. Specifically, we find that appraisees with a stronger (vs. weaker) chronic or contextual need to engage in social comparison are more satisfied with lower (vs. higher) absolute performance feedback. Overall, we demonstrate why and how feedback interventions in relative performance evaluation systems may backfire, and suggest a set of practical guidelines for maximizing appraisees’ satisfaction with performance in such systems. © 2015 Wiley Periodicals, Inc.     

When Passion Fades: Disentangling the Temporal Dynamics of Entrepreneurial Passion for Founding

This study examines how and why entrepreneurial passion for founding changes over time. In particular, we propose that in the founding phase of a venture's lifecycle entrepreneurs’ founding identity centrality will remain stable over time. We also propose, however, that in our sample and time period studied, entrepreneurs’ intense positive feelings for founding will decrease over time. On the basis of theories of positive illusion, self‐regulation and role theory, we further hypothesize that venture idea change, change in role ambiguity and entrepreneurs’ feedback‐seeking behaviour are factors that help explain the rate of change in entrepreneurs’ intense positive feelings for founding. Using a three‐wave longitudinal research design, we find that among a sample of 112 entrepreneurs’ identity centrality does not change over time, whereas intense positive feelings for founding decrease over time. Moreover, the more entrepreneurs change their venture ideas, the weaker their decrease in intense positive feelings. Further, we show that entrepreneurs who frequently seek feedback suffer less from reduced positive feelings in response to higher increases in role ambiguity as compared to entrepreneurs who seek less feedback.     

A dynamic model of R&D competition

This study considers a dynamic model of R&D competition in a situation of no uncertainty with identical firms in a perfect foresight. We are going to find out about the effects of firms' absorptive capacity on R&D strategies in the presence of technological spillovers. The conditions for the existence and uniqueness of a feedback–Nash equilibrium on firms' R&D expense will be also discussed. Numerical simulations will show as the introduction of the absorptive capacity reduces the impact of spillovers degree on firms' R&D strategies.     

Effects of teleconferencing technologies: An exploration of comprehension,feedback, satisfaction and role-related differences

Several theoretical approaches have been put forth to predict and explain the effects of teleconferencing technologies. One approach is to examine the functions of nonverbal signals and to make predictions based on the fact that different teleconferencing technologies allow nonverbal communication to different extents. One of the functions of nonverbal signals is to allow the listener to provide feedback to the speaker in a communication. Prior research has shown that such feedback enhances listener comprehension. In this study, it was hypothesized that different teleconferencing technologies would allow different levels of feedback based on their ability to accommodate nonverbal signals, and this in turn would affect comprehension. An experimental study was conducted to compare comprehension, feedback, and satisfaction in telephone and computer conferencing. The study confirmed that comprehension and speaker satisfaction are related to feedback, but failed to show a relationship between listener satisfaction and feedback. No difference in comprehension, listener, or speaker satisfaction was observed across teleconferencing technologies. Role-related differences were observed between the speaker and the listener. It is suggested that the effects of teleconferencing technologies can be mapped systematically by examining each of the functions of nonverbal signals, one at a time.     

一种数字丝悬式垂直磁力仪传感器的研制

本文根据我国现有的机械式丝悬垂直磁力仪的结构，提出了将其政装为数字化丝悬式垂直磁力仪的差动式电容传感器的设计方案。样机测试表明，其测量精度可与ＭＰ—４型质子磁力仪相媲美．具有结构简单，易掌握操作，成本低等优点．     

IM反馈及时性对消费者态度和购买意愿影响的研究——产品类型和价格可议性的调节作用

即时通讯(Instant Messaging,IM)在网络购物中起着不可忽视的作用.本文通过对277名网络消费者进行情境模拟实验,探究了IM反馈及时性、产品类型和价格可议性三个变量对消费者态度及购买意愿的影响.结果表明:(1)IM反馈及时性对消费者态度和购买意愿具有显著正向影响:及时反馈比不反馈有更高的消费者态度和购买意愿;(2)产品类型在上述关系中有一定调节作用:体验型产品受IM反馈及时性的影响更大;(3)价格可议性并无显著调节作用.根据研究结果,从网络商家角度提出相应管理建议.