大学英语写作课中的同伴反馈

同伴反馈是大学英语写作课中一种行之有效的教学方法。同伴反馈有利于提高评价者的写作水平、促进学生之间的合作和交流。     

Using a mobile application to test the impact of giving feedback onteam-level conflict

The authors explored using a mobile application called DevelapMe for 278 business undergraduates in 54 teams to give real-time peer-based feedback during a 5-week group project. Two online surveys, Time 1 (T1) and Time 2 (T2), were administered. Results included finding three promising, new give-feedback scales: positive rating with comments, negative rating with comments, and negative/neutral rating without comments. Relationship conflict and task conflict were the outcomes. Relationship conflict significantly increased from T1 to T2. Only positive rating with comments had a significant relationship to T2 relational conflict and task conflict. Research exposing students to real-time feedback apps will prepare them for future work in teams.     

Three‐period,two‐treatment crossover design under long‐term carryover effect

The paper describes non‐parametric approach for analysis of a three‐period, two‐treatment, four‐sequence crossover design in which test procedure for interchangeability of the treatment effects is obtained. The proposed procedure is based on a non‐parametric model, which incorporates, along with the direct treatment effects and the usual carryover effects, the long‐term carryover effects. Relevant competitors are obtained. Related asymptotic results are given. By performing simulation study, we compared the procedures with respect to type I error rate and power. Furthermore, confidence intervals for treatment differences are studied. The procedures are illustrated with a data study.     

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。     

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.     

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.     

Innovation objectives,knowledge sources,and the benefits of breadth

Given the inherent risk of innovative activity, firms can improve the odds of success by pursuing multiple parallel objectives. Because innovation draws on many sources of ideas, firms also may improve their odds of successful innovation by accessing a large number of knowledge sources. In this study, we conduct one of the first firm‐level statistical analyses of the impact on innovation of breadth in both innovation objectives and knowledge sources. The empirical results suggest that broader horizons with respect to innovation objectives and knowledge sources are associated with successful innovation. We do not find diminishing returns to breadth in innovation objectives, which suggests that firms may tend to search too narrowly. We interpret these results in light of well‐known cognitive biases toward searching in relatively familiar domains. Copyright © 2009 John Wiley & Sons, Ltd.     

基于并联FIR滤波器组的Hammerstein预失真器

采用预失真技术对功率放大器的记忆非线性失真进行补偿的关键是预失真器建模的准确性,尤其是模型对功率放大器逆记忆特性的描述能力。针对目前预失真器模型对功率放大器逆记忆效应描述不充分的问题,提出了将查找表(LUT)级联一个具有并联结构的有限长单位冲激响应(FIR)滤波器组作为实现形式的Hammerstein预失真器,以提高传统Hammerstein预失真器的补偿性能,并采用一种两步算法对其参数进行辨识。仿真实验表明,提出的Hammerstein预失真器能更好地补偿带强记忆效应的功率放大器的非线性失真。     

基于反馈信号检测的汽车疑难故障诊断

通过对现代汽车反馈传感器信号检测的结果分析,总结目前机动车疑难故障诊断的新的方法和思路,对汽车维修中常见的无明显故障码的现象产生原因进行研究,提出了相应的解决办法和应对措施．对汽车反馈传感器波形检测的实车应用进行了有意义的探讨和论证．