身份与权限体系关键技术的总体设计与实践

高校信息化建设中普遍存在对用户身份和权限体系进行统一管理等问题,对上海交通大学统一身份认证和授权系统的总体设计,以及关健技术进行了探讨.     

基于LDAP的Web统一身份认证的研究与实现

结合实例介绍了基于LDAP的统一身份认证系统的完整实现过程。系统采用LDAP储用户认证信息，可以构建复杂的分布式目录结构。在LDAP存储模型的基础上，系统实现了统一的用户认证信息管理系统，可以通过统一的界面和逻辑对用户认证信息进行集中管理。     

基于LDAP的统一身份认证管理系统的设计与实现

文章介绍了一个支持用户单点登录的统一访问控制系统,系统基于LDAP目录服务,它将各种应用系统的身份认证结合在一起,实现了用户统一管理的安全访问。系统采用优化技术,有效的解决了大量用户访问LDAP时的瓶颈问题。     

分布式赋权的统一身份认证系统模式研究

分布式赋权的统一身份认证系统是在统一身份认证系统技术基础上,借鉴集中式权限管理的数据存储模式,变用户权限集中管理为分布式管理的用户与权限管理系统。它解决了统一身份认证系统没有用户权限管理、集中式权限管理又不为信息敏感系统所信任,以及人为的权限管理任务转移可能导致管理效率低下等问题。     

基于统一身份认证的Moodle网络教学平台用户管理

在不断深入的数字化校园建设中,用户信息的管理成为重要而迫切的问题。以LDAP为核心的统一身份认证技术为用户信息管理提供了重要支持。通过实施校园网统一身份认证系统,并将Moodle网络教学平台的用户管理整合进去,实现Moodle用户的统一管理和单点登录,为简化平台用户管理、提高平台的易用性起到了重要作用,是推广平台使用的重要措施。     

RUP在图书馆管理系统开发中的应用

由于图书馆读者需求的不断变化导致了系统开发和用户需要之间的不一致，为了提高系统开发效率、保证开发过程的有效性，探讨了统一软件过程和统一建模语言在图书馆信息管理系统开发中的应用。     

基于目录服务的数字化校园统一身份认证

本文首先分析高校数字化校园中统一身份认证系统建设的必要性,简要地介绍了LDAP协议及其相关的技术,提出了基于LDAP的校园网统一身份认证机制实现了对校园网用户统一身份管理统一身份认证。     

统一信息互动平台的研究与实现

分析统一信息服务的应用基础,提出统一信息平台体系结构、技术实现和模块建立的方法,为企业和用户打破人力、空间、时间限制实现对网络与信息资源的融合统一应用,把单一的、单向的主动服务型提升为在线式互动型服务,建立企业统一信息服务体系。     

统一身份认证及其在校园网中的应用

基于校园网的应用系统的建设带来一个用户需要许多账号和密码的问题,使用统一身份认证系统可以实现用户单点登录、多种方式认证.对统一身份认证服务的组成和实现进行了论述,并给出了一个使用统一身份认证的校园门户的结构框架.     

基于.net三层架构的用户服务系统的设计与应用

基于.net三层架构的统一用户服务系统主要包括统一认证和组织结构管理两部分功能.统一身份认证及组织结构管理系统的目标主要包括:提供统一的、完善的、易用的用户认证和组织结构管理平台;为现存的和即将开发的各应用系统提供一个跨平台的认证授权信息管理接口,解决了传统管理系统中组织结构混乱、用户使用不便、安全性差等问题;完善用户管理功能的同时,提高统一企业平台的安全性,抵御潜在的安全风险.     

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.     

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.     

A computer generator for randomly layered structures

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

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。     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.