基于可变精度粗糙集的规则挖掘矩阵算法

提出了一种基于可变精度粗糙集的规则挖掘矩阵算法,它是一个采用基于分类精确度的粗糙集模型进行决策规则挖掘的新方法,能有效地处理决策表的不一致性。实例结果和实际应用表明该算法是有效的,为信息系统的规则约简、获取和信息压缩提供了新的思路。     

企业集团内部财务控制系统构建的重要性

阐述了目前企业集团发展经营面临的矛盾和问题,通过财务内控剖析了经营问题的根源,指出构建财务控制系统是必然趋势,它起到了合理配置资源的积极效用。     

中国企业国际化经营与国际市场进入方式

中国企业国际化经营表现出自身多目标特点。在获得技术、占领市场、获取资源、实现企业总体战略、实现全球战略等多目标约束条件下,针对直接出口、合同进入、独资进入、跨国并购等国际市场进入方式对不同目标的效果值以及各目标之间的相互关联性,运用目标关联分析方法对各种方案优化决策,结果发现,我国企业国际化经营的国际市场进入方式,应首选“独资进入”和“跨国并购”方式。     

一种区间型不确定多属性决策的统计方法

讨论了属性值为区间值的一类不确定性多属性决策问题．将属性值转化为决策者的满意值后，结合决策者的满意值和属性自身的权重，指出现行简单加权平均以及有序加权平均方法存在的缺陷，提出了一种新的基于随机变量和统计特征的新方法．通过实例证明了该方法的有效性．     

对不平衡类分类的一种组合方法

具有不平衡类分布的数据集在许多实际应用中是很常见的,但由于类分布不平衡,给那些已有的分类算法带来了很多问题。一种为处理不平衡类问题而开发的基于决策树和人工神经网络的有效组合方法被讨论。它基于数据抽样的方法构建组合分类器,并利用ROC曲线(Receiver Operating Characteristic curve)作为评价挖掘性能的分析工具,最后在PAKDD2007竞赛活动提供的实际数据上进行了有效性验证。     

Nonlinear interactions between gravity waves and background winds

Using the nonlinear propagating gravity waves (GW) model in the two-dimensional compressible atmosphere and the linear GW theory, the process of GW propagation in different background winds, e.g. the direction of the background wind is opposite to (dead wind) or the same as (tail wind) the direction of the horizontal phase velocity of GW, is studied. The results show that the dead wind prolongs the vertical wavelength and accelerates GW propagation. Therefore, GW propagates up to a higher height becomes instable in a short time and eventually induces an inverse jet flow. Then, the vertical wavelength is becoming short due to the nonlinear interactions between GW and the inverse jet flow. The vertical wavelength and group velocity decrease after GW propagates into the tail wind. The initial instable time is delayed. Although most of GW is trapped in the instable region, some of GW propagates above the instable region. Compared with GW propagation in the tail wind, the nonlinear interactions between GW and the dead wind are also strong. In contrast, the linear GW theory predicts that GW can propagate freely in the dead wind. The vertical wavelength simulated by the nonlinear numerical model is different from that predicted by the linear theory greatly after GW propagates into the dead wind.     

基于决策树和聚类理论的XML文档数据挖掘的研究

Extensible Markup Language即"可扩展的标置语言"(简记为XML)的出现,为基于Web的数据挖掘带来了便利,开发人员能够用XML的格式标记交换数据。充分利用XML的优点,提供一种利用决策树ID3修正算法和聚类的方法,对XML文档信息进行挖掘,并结合实例说明这种方法。     

Control of group velocity in an annular chain of microring coupled-resonator optical waveguides

In order to control group velocity,an annular chain of microring coupled-resonator optical waveguides was analyzed,and its transmission spectra were obtained using the transfer matrix method. The result showed that the curvature of the chain caused the dispersion curves to shift and the resonance fre-quency got fixed. It is therefore concluded that the group velocity of light in the annular chain of mi-croring coupled-resonator optical waveguides can be controlled by adjusting the curvature of the chain. We believe that such an annular chain can be used as an optical buffer or signal retarder for optical communication.     

浅析中国饭店集团的发展之路

21世纪是集团化竞争的时代,国际饭店集团大肆进军我国饭店业,在给我们带来机遇的同时也带来了巨大的挑战。在分析我国饭店集团现状的基础上,论述了中国饭店集团发展壮大的出路。     

连续值域决策表的属性约简算法

结合模糊聚类技术与粗糙集理论，首先给出了一种求连续属性重要性的方法，然后由粗糙集中属性约简思想，给出连续值域决策表的属性约简算法，最后通过实例说明该算法的有效性。