Superior–Subordinate Relationships in Korean Civil Engineering Companies

The Leader–Member Exchange (LMX) relationship quality between superiors and subordinates in Korean civil engineering companies were empirically examined for superiors’ feedback-seeking behaviors. The results showed that for superiors, affect, loyalty, and contribution toward subordinates were positively related to seeking negative as well as positive feedback from subordinates. From subordinates’ point of view, affect, contribution, and professional respect toward their superiors were positively related to superiors’ negative feedback seeking, but affect was negatively related to superiors’ positive feedback seeking. It was also found that superiors and subordinates were not consensual in LMX and superiors’ feedback-seeking behaviors. For example, for superiors, all of the four LMX dimensions were positively related to superiors’ asking subordinates directly for feedback, whereas for subordinates, none of the LMX dimensions were significantly related to superiors’ asking subordinates directly for feedback. These and other findings are discussed in detail, and implications for the findings are provided.     

碳和磷对热轧带钢氧化铁皮起泡行为的影响

氧化铁皮的起泡行为发生在热轧过程,当铁皮发生起泡现象时,铁皮界面气体压力增加造成铁皮被顶起,在热轧轧制中起泡的铁皮被碾碎易于形成麻点和铁皮压入缺陷.通过热重分析手段和扫描电镜微观观察研究了超低碳钢、超低碳含磷钢、低碳钢、中碳钢在加热过程中铁皮的起泡行为,重点探讨了磷和碳元素对铁皮起泡行为的影响.研究表明,在980℃附近磷元素形成Fe3(PO4)2,此相高温下易于熔融气化造成铁皮起泡;在1050℃以上的高温区间,碳元素活性增高,随着铁皮生长界面碳元素的富集氧化,形成CO和CO2对铁皮起泡影响明显,高温试样铁皮气孔和裂纹密集.     

T-MPLS网络中基于多等级业务的调度算法

为保证不同类型业务在传送多协议标记交换网络中的合理调度,并提高链路带宽资源利用率,提出了一种改进型的加权公平调度算法. 为分析该算法性能,利用OPNET仿真软件搭建平台进行仿真. 结果表明,相比于传统的加权公平算法,该算法在不增加算法复杂度的基础上能有效地节约链路带宽资源,并使高等级业务获得更好的时延特性.     

一种无知识表示方式与其对应的元推理机制

讨论了知识、元知识的特征、关系以及表示方式．认为知识和无知识均可用谓词来统一地表示，即用一阶谓词表示知识，用高阶谓词表示无知识．简述了高阶逻辑程序设计语言ＨＩＦＵＮＬＯＧ，然后以该语言为基础，探讨高阶逻辑程序语言的推理机制．用谓词表示法统一地表示知识和无知识使得元推理与推理具有同样机制，均是（合一＋归结）＋的过程．     

Effect of H_2 dilution on the structure and properties of nc-CrC/a-C:H coatings deposited by a hybrid beams system

Nanocomposite Cr C/hydrogenated amorphous carbon(nc-CrC/a-C:H) coatings were deposited by a hybrid beams system comprised of a hollow cathode ion source and a cathodic arc ion-plating unit with varying H_2 flow rates. The influences of H_2 flow rates on the morphologies, microstructures, and properties of the coatings were systematically studied. The morphologies and microstructures of the coatings were characterized by SEM, AFM, XPS, Raman spectroscopy, GIXRD, and HRTEM. The mechanical and tribological properties were measured by a nano-indenter, scratch tester, and ball-ondisk tribometer. The wear tracks were evaluated using 3D profilometer, optical microscope, and EDS analysis. It has been found that a moderate H_2 flow rate can effectively smooth the surface, enlarge the fraction of a sp~3 bond, and improve the properties. The coating exhibits the highest hardness and elastic modulus at the H_2 flow rate of 40 sccm. A superior combination of adhesion strength,friction coefficient, and wear resistance can be achieved at the H_2 flow rate of 80 sccm.     

三相异步电机新模型及其仿真与实验

介绍了三相异步电机的一个新模型。新模型由原始的相轴线模型经过变换得到。该模型可应用在电机定子三相参数不对称的状态。计算机仿真和电机模拟实验表明：在派克方程适用范围，新模型与PARK模型的响应完全一致：当电机定子三相参数不对称时，此时已超出PARK模型的适用范围，新模型的仿真计算结果与电机的实验数据相当吻合。新模型具有比PARK模型更广的适用范围。该模型在三相异步电机的监测及控制方面有广泛的应用前景。     

面向岗位的网络构建实习方案研究

网络构建实习是网络工程及相关专业的必修实践课程,为获得更好的实习效果,提出了面向岗位的网络构建实习方案,它的核心思想是:分解实习任务为岗位任务,明确岗位职责,实习生对岗入座,完成本岗任务后,通过轮岗,熟悉其他岗位的工作,最终熟悉整个工作过程,通过不断总结、改进、提高,真正达到提升实践能力和专业水平的目的.     

实时市场中电价多解的判定机理

电价多解情况的出现将为实时市场的出清带来困难,有必要从理论上对其发生条件进行研究,并建立高效判定方法以提高实时定价效率。文中对节点电价多解情况的判定机理进行了深入分析和研究,基于市场出清问题的物理特性和数学特征,提出了退化、对偶问题多解与节点电价多解三者之间明确而严格的数学关系,基于所获判定机理建立了电价多解情况的完整有效判定流程,最终利用算例进行了判定方法对比以及有效性与适应性验证。     

Design and implementation of a high‐efficiency LiFePO4 battery charger for electric vehicle applications

This letter studies and implements a high‐efficiency LiFePO₄ battery charger. The modular design can satisfy the requirements of series/parallel charging for electric vehicle applications. A CC‐CC‐CV charging scheme is also realized to meet the characteristics of LiFePO₄ battery stacks. A 2 kW laboratory prototype is built and tested. The experimental results are shown to verify the feasibility of the proposed scheme. Copyright © 2012 John Wiley & Sons, Ltd.     

基于DEA的第三方物流动态绩效评价研究

目的 建立基于DEA的动态模型，实现对第三方物流企业的绩效跟踪动态评价．方法 分析DEA方法评价物流企业绩效的可行性．运用非参数系统评价方法——数据包络分析有效地处理多输入、多输出指标的决策单元评价．结果 将静态DEA模型中的“评价单元”转换为动态DEA模型中的“评价时间”，实现了对决策单元的动态评价．从而解决了现实中具有时序特征的动态绩效评价问题．结论 动态DEA方法为第三方物流企业的绩效评价提供了一条新的思路．运用该方法对企业的经营业绩进行分析，能及时发现问题并为企业制定经营决策等提供依据。