基于约束理论的订单履行系统设计与实现

现有对订单履行系统的研究存在2处不足：订单履行流程被分解为订单允诺和需求满足两方面,鲜有在同一系统框架下展开研究;订单履行实现涉及众多系统的信息,少有研究其体系架构。为解决上述问题,以按照约束理论构建的统一的订单履行流程为核心,以面向服务架构的Web服务集成技术为支撑,设计与实现了整合式的订单履行系统。该系统在某大型企业中获得成功的应用,验证了该流程及体系架构的可行性。     

基于图着色理论的最大效用频谱分配算法

研究基于图着色理论的频谱分配算法,提出一种改进的最大效用频谱分配算法。该算法生成类似于ISAA算法的用户效用矩阵和相应的干扰矩阵,选择最大效用用户或干扰值为0的用户进行频谱分配。仿真结果表明,该算法能有效减少频谱分配的时间开销,提高频谱的使用效率,最大化认知无线电系统的总效用。     

汉维统计机器翻译中的形态学处理

针对汉语和维吾尔语语序差别(前者是主-谓-宾结构,后者是主-宾-谓结构)及形态差别较大的问题,通过编写调序规则将汉语调整为主-宾-谓结构,将维吾尔语单词切分为词干、词缀等更小的词素单元来训练统计模型,同时测试词素的切分粒度对翻译性能的影响.实验结果表明,对汉语句法结构的调整及以词干、词缀等更小的词素形式参与训练可以有效...     

基于粗糙集和证据推理的网络入侵检测模型

证据推理依赖于专家知识提供证据,要求各证据体相互独立,因此难以应用于实际。针对上述问题,提出基于粗糙集理论的证据获取和基本概率赋值客观确定方法,利用粗糙集中的属性约简算法剔除冗余属性,形成最简属性集,以提高证据合成效率,缩短证据合成时间,减少证据合成的冲突现象。在此基础上建立一个基于粗糙集和证据推理的网络入侵检测模型,通过算例验证该模型检测精度较高、误检率较低。     

团分划问题的固定参数算法研究

图论中的团分划问题属于NP-完全问题,难以在多项式时间内解决。为此,对团分划问题的固定参数算法进行研究,提出一个针对K4-free图的新归约法则,结合深度限制搜索树技术对K4-free图中的团分划固定参数可解类算法做出改进。实验结果表明,与原算法相比,在稀疏图的情况下改进算法效率提高了30%。     

基于图论的语义Web服务聚类方法

提出一种基于图论的聚类方法,用于在语义Web服务类别数量未知的情况下实现领域服务分类。通过计算待分类服务的相似度矩阵,得到相似度阈值,将相似度矩阵中超过该阈值的元素置为1,其余元素置为0,由此得到服务连接矩阵,再以该矩阵为图,逐个提取其中的最大完全子图,每个子图的节点服务就是一个服务类。理论分析与实验结果证明,该方法可以通过一次聚类得到服务的自然分群,聚类时间较短。     

基于粗糙集的推理通道消除

基于粗糙集理论对推理通道问题进行了研究。通过采用属性约简和属性值约简方法对数据库中的数据进行处理。在属性值约简基础之上,采用一种改进算法找出了数据库中推理规则集。进一步,将推理规则集中属性频率高的属性安全级别提高至决策属性的安全级别,从而消除推理通道。最后通过一个实例表明提出的消除通道算法是有效的。     

一种改进的证据理论C均值分割方法

证据理论C均值(ECM)作为传统聚类方法的一种改进仍然存在着对噪声敏感和易于陷入局部极小值的缺点,鉴于此,提出一种遗传算法(GA)和证据理论C均值相结合的分割方法,并且在分类过程中引入了位置信息。遗传算法具有全局搜索的能力,很好地克服了证据理论C均值结果局部最优的缺点,而位置信息的引入则解决了对噪声敏感的问题。实验结果证明,该方法收敛速度快,迭代步数少,分割精度高。     

What affects information systems development team performance? An exploratory study from the perspective of combined socio-technical theory and coordination theory

Quality is an important factor in information systems development (ISD), and ISD team performance closely relates to quality. To better understand ISD teams, we empirically tested a model on ISD team performance by combining socio-technical theory and coordination theory. Using existing empirical studies and data collected from three well-known ISD companies in China, our research results identified influential characteristics of ISD team performance, and revealed similarities and differences between China’s ISD team performance and those in other countries. By the results, we find that knowledge sharing and major do not affect team performance. The compensation satisfaction to job performance is not significant in China, either. Our research provides suggestions for building and supporting ISD teams that could lead to performance improvements.     

Even in virtual environments women shop and men build: A social role perspective on Second Life

The present study examined whether traditional gender role expectations (Eagly, 1987) influence behaviors in non-traditional contexts such as online virtual environments. Participants were 352 Second Life users who reported their activities and experiences in Second Life. Results indicated that men and women differed in the types of activities they engaged in a manner predicted by social role theory. Specifically, as compared to women, men were more likely to report building things (e.g. objects), to own and work on their own virtual property, and were less likely to change their avatar’s appearance. Women, as compared to men, were more likely to meet people, shop, regularly change their avatar’s appearance, and buy clothes/objects for their avatar. The present study adds to our understanding of how traditional gender role expectations may carry over to online virtual worlds and influence online behavior.