Internal and contextual factors, knowledge processes and performance: From the Chinese provider’s perspective

This paper explores the influences of two internal factors, i.e. supplier team’s IT-based skills and communication with client’s team, and two contextual factors, i.e. supplier team’s understanding of client’s culture and collaboration with client’s team, on knowledge processes and performance in global sourcing of IT services from the Chinese provider’s perspective. Knowledge processes are characterized by knowledge sharing, knowledge-based coordination and expertise management, and performance is measured by product success and personal satisfaction. Data have been collected in 13 companies in Xi’an Software Park, with 26 in-depth, semi-structured interviews held with top and middle managers, and 200 structured questionnaires distributed to knowledge workers who are involved in global sourcing projects. The results indicate that supplier team’s IT-based skills, communication with client’s team, cultural understanding of client’s culture and collaboration with client’s team are positively associated with knowledge process and performance. Also, knowledge sharing, knowledge-based coordination and expertise management are found to be crucial for those influential factors to function positively and contribute to the performance. The findings of this study suggest that the effects of key factors on knowledge processes and performance in global sourcing of IT services appear to transcend the social and cultural differences; however, contextual factors seem to have more significant influences on knowledge processes and performance in global sourcing of IT services.     

基于和声搜索算法的知识即服务动态组合优化

面向服务的云计算环境为制造领域的知识创新提供了新的思路。知识即服务的动态组合是知识创新过程中的关键技术之一。云计算服务资源的虚拟性和动态性为组合的知识即服务的服务质量提出了新的挑战。针对制造领域知识即服务组合的服务质量优化问题,提出一种改进的和声搜索算法(SLHS),SLHS算法利用Skyline方法对和声记忆库进行初始化以提高算法的运行效率,并采用理想点法选择制造知识即服务以确保解的有效性。仿真实验中引入了基本和声搜索算法作比较。实验结果表明SLHS算法在解的质量方面和算法性能方面均明显优于基本和声搜索算法。     

部分四值逻辑中准完备集的最小覆盖

根据部分K值逻辑的完备性理论以及准完备集之间的相似关系理论,定出了部分四值逻辑的所有准完备集的最小覆盖,从而解决了部分四值逻辑中Sheffer函数的判定问题。     

聚氨酯—环氧树脂胶粘剂的研制

研制出一种无溶剂的双组份聚氨酯 -环氧树脂胶粘剂。结果表明 ;它有较高的粘接强度和伸长率 ,达到半结构胶的要求 ,有较高的耐水和耐温性 ,当一定量聚氨酯预聚体含量时 ,胶粘剂的粘接强度出现最佳值。     

基于小波包的多载波调制系统的峰均比分析与消减

介绍了以小波包函数为载波的多载波调制系统,分析了WPM信号符号周期内峰值功率的互补累积分布函数(CCDF)及其对PAPR性能的有效描述;并对不同小波滤波器组的PAPR性能进行了比较,提出了一种能有效减小WPM系统的峰均比的压缩扩展算法。仿真实验证明了该算法的有效性和可行性。     

镍基熔覆涂层受冲击载荷作用下的性能研究

45钢及1Cr18Ni9Ti表面激光熔覆WFCL-11涂层，研究了激光熔覆涂层与基体界面及表面显微组织和硬度特点，分析在冲击载荷作用下，显微组织、结合性能、硬度变化等特点。发现了不同基材与熔覆材料对结合面性能的影响。     

有限差分法计算HF分子的振动能级和光谱

本文用有限差分法计算了HF分子的振动能级并且把计算的结果用切比雪夫法进行拟合得到了HF的光谱项,将所得结果与黄整等人的用时域有限差分法计算所的结果和实验值进行了比较。     

A simple lattice Boltzmann scheme for low Mach number reactive flows

For simulating low Mach number reactive flows, a simple and coupled lattice Boltzmann (CLB) scheme is proposed, by which the fluid density can bear significant changes. Different from the existing hybrid lattice Boltzmann (HLB) scheme and non-coupled lattice Boltzmann (NCLB) scheme, this scheme is strictly lattice Boltzmann style and the fluid density couples directly with the temperature. Because it has got rid of the constraint of traditional thought in lattice Boltzmann scheme,on the basis of the equality among the particle speed c, the time step △t and the lattice grid spacing △x held, both c and △t can be adjusted in this scheme according to a "characteristic temperature" instead of the local temperature. The whole algorithm becomes more stable and efficient besides inheriting the intrinsically outstanding strong points of conventional lattice Boltz-mann scheme. In this scheme, we also take into account different molecular weights of species, so it is more suitable for simulating actual low Mach number reactive flows than previous work. In this paper, we simulated a so-called "counter-flow" premixed propane-air flame, and the results got by our scheme are much better than that obtained by NCLB. And the more important thing is that the exploration in this work has offered a kind of brand-new train of thought for building other novel lattice Boltzmann scheme in the future.     

一种基于密度树的网格快速聚类算法的研究

聚类算法是数据挖掘领域中一个非常重要的研究方向。人们已经提出了许多适用于大规模的、高维的数据库的聚类算法。基于密度的聚类算法是其中一个比较典型的研究方向。该文以CABDET算法为基础，提出了一种基于密度树的网格快速聚类算法，该算法将网格的原理运用到基于密度树的聚类算法中，有效地提高了聚类的效率，降低了I/O的开销。     

集散控制系统中阀位监视以及局部开关综合应用

文中分析研究了集散控制应用系统中顺序控制的应用实例。并对特殊顺序控制16位阀位监视功能块VLVM和32点局部开关功能块LSW进行了分析研究和应用。对应用系统的实例给出了详细的程序设计分析。设计了控制回路图连接和顺序控制表的编写。对触点信号动作和限位开关的工作状态进行了说明。对特殊运用的顺序控制功能块的I/O连接、输出监视功能和16位阀位监视功能块详细定义均进行了明确的阐述。