基于XML的B2B电子商务安全研究

分析B2B电子商务的重要性及其安全通信的需求,遵照W3C发布的XML加密规范标准及信息交换的标准格式,通过.NET开发平台,实现对XML元素或元素内容进行加密、签名,从而实现基于XML的B2B电子商务的安全数据交换.     

XML信息的加密及实现

简述了XML在跨平台分布式中的应用（数据交换），分析了XML加密的必要性和特点，详细阐述了XML加密信息的原理和类型，最后探讨了XML加密技术在Visual Studi．NET2005下的实现。     

基于XML安全的加密数据库中的数据交换

随着Intemet技术的迅速发展，数据库中敏感数据的安全性问题也随之引起人们的重视．该文基于XML加密的思想，给出了一套传递加密数据库中的密文及其相关解密信息的标记，并且设计了加密数据库和XML文档之间的映射规则，最后给出了一个基于XML的加密数据库的数据交换模型。     

基于XML的物流数据交换技术

目的为满足物流配送系统异地分布式物流数据交换的需求,提出利用以XML文件作为物流数据交换平台的方法。方法利用JDOM组件实现了XML文件的生成与解析,遵循W3C规定的XML加密规范说明物流数据XML文件的加密原理。结果利用Lempel-Ziv和Huffman编码实现了XML文件的充分压缩。结论这种支持物流数据交换的解决方法,可实现网络环境下物流数据的有效交换与共享。     

利用XML安全包实现数字图书馆通信安全

分析了XML安全的重要性,介绍了如何利用XML安全包实现XML文档的数字签名、文档规范化和元素级加密。     

基于XML的移动电子商务数据加密技术的研究

针对移动电子商务的特点,依托XML语言强大的数据处理能力,提出了一种基于XML的移动电子商务数据平台上实现数据加密的技术,即采用改进的对称RC4加密算法和非对称ECC加密算法对移动平台的数据进行加密,该技术使得移动终端之间或者移动终端与数据服务器之间能够更好、更安全的进行交互.整个过程始终采用XML作为数据交换的中介,...     

XML加密技术的研究与实现

讨论了XML加密技术及其应用，并结合实例说明各种类型的加密方法的实现：整个文档的加密、元素的加密、元素内容的加密及非XML数据的加密。     

基于XML的多方数据通信安全模型研究

本文针对XML签名规范的不足之处，提出了基于XML的多方通信安全模型，保证XML数据的确认性、完整性和不可否认性，解决基于XML通信技术的业务链中多方通信数据安全问题，从应用层的角度提供了多方通信时的身份认证和XML数据完整性．同时该模型还具有整体签名、部分验证的特点。     

浅析XML安全技术

文章从XML安全技术目前备受关注的原因出发,分析了基于XML安全解决方案的优点,描述了XML加密和XML签名设计方案以及XML数字签名标准和XML加密标准的基本组件,并对该技术进行了总结和展望。     

XML数据交换技术在数字化校园中的应用研究

数据交换是数字化校园建设方案的核心技术,作为数据表示和交换的标准,XML解决了数据格式不一致的难题和异质系统之间的通信,使不同系统/平台的数据交换变得非常容易.以研究生院的招生管理系统为例,论述数字化校园建设中基于XML的数据交换的技术设计和实现.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to