奖励能否激励员工创造力:不同成就动机氛围下的匹配研究

激活员工创造力、凝聚新的发展动力是企业面临的紧迫任务.基于系统而权变的视角,以"语义感知-心理计量-行为强化"为理论主线,针对60个团队274名员工样本,运用跨层次分析考察了不同成就动机氛围下奖励(水平和结构)对创造力的影响.结果表明,精熟氛围、扁平型奖励结构正向影响突破式创造力;表现氛围、陡峭型奖励结构正向影响渐进式创造力:三项交互检验显示,在高精熟氛围及扁平型结构下,提高奖励水平能够更好地激活突破式创造力;而在高表现氛围和陡峭性结构下,提高奖励水平能够更好地激活渐进式创造力.研究揭示,成就动机氛围、奖励结构与创造力类型之间存在一种相对最优的匹配关系.蕴含的实践价值在于,企业应从执行角度在项目团队营造表现动机氛围并辅以竞争性激励结构,以提升渐进式创造力,快速获取局部竞争优势;但鉴于"渐进式创新有余,突破式创新不足"的企业创新格局,我们更应从战略视角在技术核心部门营造精熟氛围并辅以高位均衡的激励模式,以催生突破式创造力,赢得持久竞争优势.     

基于PLC-200的大功率直流电动机调速系统的设计

以大功率直流电动机调速系统为研究对象,采用西门子PLC-200作为主要控制器件,西门子6RA70作为执行单元,罗升触摸屏作为上位机,同时采用增量式PID控制算法实现大功率直流电动机自动直流调速系统的设计.     

心室颤时脑微动脉血管的应力实验

实验测得了猫在心室颤前，后的脑微动脉内径及血压的变化，引入增量应力和应变的概念，计算了在心室颤前后微动脉血管（内径小于１００μｍ）应力与应变的变化规律，并获得了在不同期间内血管的本构方程。     

火电厂机组最优组合的一种实用算法

本文在文[1] 、[2] 的基础上,根据等微增率准则,对不考虑启动耗量的火电厂机组投入、切除的经济性问题进行了研究。通过引入切换微增率,切换负荷的概念,提出了一种确定火电厂经济运行最优机组组合的实用算法。根据计算结果,调度人员可以了解在什么负荷范围内应选用哪种机组组合方式才是经济的。     

弹性薄壳大变形分析的杂交应力法

本文基于增量余能原理,导出了用于板壳几何非线性分析的假定应力杂交模型。根据单元体边界和内部位移的协调内插以及满足单元体内应力平衡的应力分布假定,列出了有限元的公式,而最后的矩阵公式中只包含节点的未知位移。由此我们建立了3节点、15个自由度的三角形扁壳单元。考虑到计算量的原因,我们对这种单元的应力平衡条件进行了简化处理,仅采用部分满足应力平衡方程的非一致模式。有关公式都是在当前的拉格朗日坐标系统中建立的。数值计算结果表明,用杂交应力模式来分析板壳结构的大变形是很有效的。     

Behavior of argon gas release from manganese oxide minerals as revealed by <Superscript>40</Superscript>Ar/<Superscript>39</Superscript>Ar laser incremental heating analysis

Manganese oxides in association with paleo- weathering may provide significant insights into the multiple factors affecting the formation and evolution of weathering profiles, such as temperature, precipitation, and biodiversity. Laser probe step-heating analysis of supergene hollandite and cryptomelane samples collected from central Queensland, Australia, yield well-defined plateaus andconsistent isochron ages, confirming the feasibility dating very-fined supergene manganese oxides by 40Ar/39Ar technique. Two distinct structural sites hostingAr isotopes can be identified in light of their degassing behaviors obtained byincremental heating analyses. The first site, releasing its gas fraction at thelaser power 0.2-0.4 W, yields primarily 40Aratm, 38Aratm, and 36Aratm (atmospheric Ar isotopes). The second sites yield predominantly 40Ar* (radiogenic 40Ar),39ArK, and 38ArK (nucleogenic components), at ～0.5-1.0 W. There is no significant Ar gas released at the laser power higher than 1.0 W, indicating the breakdown of the tunnel sites hosting the radiogenic and nucleogenic components. The excellent match between the degassing behaviors of 40Ar*, 39ArK, and 38ArK suggests that these isotopes occupy the same crystallographic sites and that 39ArK lossfrom the tunnel site by recoil during neutron irradiation and/or bake-out procedure preceding isotopic analysis does not occur. Present investigation supports that neither the overwhelming atmospheric 40Ar nor the very-fined nature of the supergene manganese oxides poses problems in extracting meaningful weathering geochronological information by analyzing supergene manganese oxides minerals.     

Incremental Web Usage Mining Based on Active Ant Colony Clustering

To alleviate the scalability problem caused by the increasing Web using and changing users＇ interests, this paper presents a novel Web Usage Mining algorithm-Incremental Web Usage Mining algorithm based on Active Ant Colony Clustering. Firstly, an active movement strategy about direction selection and speed, different with the positive strategy employed by other Ant Colony Clustering algorithms, is proposed to construct an Active Ant Colony Clustering algorithm, which avoid the idle and ＂flying over the plane＂ moving phenomenon, effectively improve the quality and speed of clustering on large dataset. Then a mechanism of decomposing clusters based on above methods is introduced to form new clusters when users＇ interests change. Empirical studies on a real Web dataset show the active ant colony clustering algorithm has better performance than the previous algorithms, and the incremental approach based on the proposed mechanism can efficiently implement incremental Web usage mining.     

一种基于规则表达式约束的序列模式增量式挖掘算法

序列模式挖掘是数据挖掘中的研究热点之一。在挖掘过程中需要用户的参与日益显得重要。为了提高挖掘过程中的交互性，本文提出了一个基于规则表达式约束的序列模式增量式挖掘算法RE_IncUp。该算法首先利用约束对已经挖掘出的频繁序列模式进行预处理，缩小了搜索范围；然后采用模式扩展方法把规则表达式约束和增量挖掘过程融为一体，并且采用先修剪后计算支持度的方法进一步缩小了搜索范围，降低了支持度的计算量。该算法允许用户不断改变约束条件，实现交互式挖掘而且可将挖掘的目标仅仅聚焦到用户感兴趣的模式上。实验表明该算法对序列模式的维护和满足用户的需求都是十分有效的。     

基于普通编码器的高精度测速方法

根据普通增量式光电编码器的测速原理，分析了引起量化误差和编码器脉宽误差的各种因素，在此基础上提出了新的信号处理算法——恒基准脉冲数法，以减小量化误差。同时将标定出的编码器脉宽系数作为脉宽误差补偿的参数，消除了利用恒基准脉冲数法测量转速时脉宽误差造成的影响，提高了系统的测量精度。