不同卫星遥感数据镶嵌最优方法探讨——以ASTER和TM影像为例

以贵州省黔南州ASTER和TM影像为数据源,运用IMAGINE ERDAS V9.1软件为主要支撑,介绍不同影像的几何校正和拼接的基本原理和方法,使数据处理和应用达到优化,为影像收集困难地区开展遥感调查及应用提供新途径。     

Interpretive approach to collective effects of electrons in multicenter problems

Interpretive theoretical tools prove valuable in guiding the analysis of experiments in the realm of atomic clusters. Here, we review basic elements of an analytic approach that makes it possible to find and visualize the effective electrostatic potential and Coulomb correlations in multicenter problems. To illustrate the utility of these concepts we apply them to exploring molecular-doped metallic clusters. This study is aiming at a systematic, visual assessment of changes induced in screening, Coulomb correlation and effective potential by varying the charge of the electronegative impurity and its position in the cluster cage.     

基于关联规则相关性分析的Web个性化推荐研究

通过分析关联规则在Web个性化推荐中存在的问题,对Web个性化推荐的关联规则相关性分析算法进行改进,并进行了详细的论证和仿真实验。实验结果表明改进的算法能实现更低支持度的推荐,能提高推荐的准确率和速度。     

我国焦炭市场消费特点及影响因素分析与检验

分析了焦炭市场需求与中国经济增长、钢铁工业增长、焦炭价格、政策和技术进步等的相关性。     

采掘GIS数据库系统的研究

讨论了建立采掘GIS数据库的必要性,分析了采掘GIS数据库的建立过程,论述了数据库的空间分析和管理功能。     

因特网防御DoS攻击技术评述Ⅰ--攻击分类与特征·包过滤·攻击检测与防御

概述了因特网上DoS攻击的相应分类及基本特征，评述了包过滤、攻击检测及防御技术的最新成果．前一部分介绍了入口过滤、基于路由的过滤网和有效源地址强制协议．后一方面主要讨论了适合于检测攻击包的技术，介绍了新近提出的频谱分析方法和泛滥检测系统．简要评述了已有的防御SYN泛滥攻击的技术措施，介绍了Cisco的TCP拦截技术，提出了改进策略．     

Damage and fracture evaluation of granular composite materials by digital image correlation method

This paper presents the applications of digital image correlation technique to the mesoscopic damage and fracture study of some granular based composite materials including steelfiber reinforced concrete, sandstone and crystal-polymer composite. The deformation fields of the composite materials resulted from stress localization were obtained by the correlation computation of the surface images with loading steps and thus the related damage prediction and fracture parameters were evaluated. The correlation searching could be performed either directly based on the gray levels of the digital images or from the wavelet transform (WT) coefficients of the transform spectrum. The latter was developed by the authors and showed higher resolution and sensitivity to the singularity detection. Because the displacement components came from the rough surfaces of the composite materials without any coats of gratings or fringes of optical interferometry, both surface profiles and the deformation fields of the composites were visualized which was helpful to compare each other to analyze the damage of those heterogeneous materials. The project supported by the National Natural Science Foundation of China (10125211 and 10072002), the Scientific Committee of Yunnan Province for the Program of Steel Fiber Reinforced Concrete, and the Institute of Chemical Materials, CAEP at Mianyang     

Modification of Spatial Coherence by Means of Low-Order Zernike-Mode Adaptive Optics

Spatial coherence of the field modified by low-order adaptive optics is analyzed to establish a theoretical basis for the recent idea of using adaptive optics as a spatial coherence modifier. In this context low-order adaptive optics has the ability to correct some of the low-order aberrations specified by Zernike polynomials. The initial field to be modified is assumed to be a spatially partially coherent one resulting from phase disturbance. It is demonstrated, as in the previous study, that low-order adaptive optics serves to enhance the spatial coherence of the resultant field and that the effect of the enhancement becomes stronger as the spatial coherence of the initially partially coherent field increases. Potential applications of low-order adaptive optics as a spatial coherence modifier are briefly discussed.     

典型相关分析在量表效标效度考核中的作用

探讨典型相关分析在新编量表效标效度评价中的作用.以乙型肝炎患者生存质量测定量表(QOL-HBV)为目标量表,SF-36量表为效标量表,用积差相关分析和典型相关分析两种方法评价量表的效标效度.结果表明,QOL-HBV量表的SF维度与SF-36量表中的除VT外的各维度具有相关性,但与MH维度的值小于0.4.在典型相关分析中得到SF-36量表的第一对典型变量主要反映PF、RP、BP、GH、SF和RE等6个维度,QOL-HBV量表的第一对典型变量主要反映SF、M F和PF等3个维度.典型相关分析能够得到和简单相关分析一样的结论,但比简单相关分析提示更多的信息.     

New Results on the Queens_n 2 Graph Coloring Problem

For the Queens_n ² graph coloring problems no chromatic numbers are available for n > 9 except where n is not a multiple of 2 or 3. In this paper we propose an exact algorithm that takes advantage of the particular structure of these graphs. The algorithm works on the independent sets of the graph rather than on the vertices to be colored. It combines branch and bound, for independent set assignment, with a clique based filtering procedure. A first experimentation of this approach provided the coloring number values ranging for n = 10 to n = 14.