支持团队分工的实时协同一致性维护技术研究

团队分工是现代企业提升工作效率及竞争力的重要手段.实时协同采用全复制式架构虽然提高了并发度,减少了响应时间,但由于其无法提供对团队分工协作的支持,导致不同团队成员之间操作互相干扰,一致性维护复杂度高.本文提出采用分治策略,将文档按照不同团队的编辑请求划分为互不相交的任务区域,并通过修正本地操作执行广播过程及远程操作获取执行过程来支持各子文档的一致性.任务完成后,通过文档合并算法从分文档得到整体一致的共享文档.本文描述分治策略的工作流程,通过正确性证明及效率分析验证了策略的有效性,并通过具体应用分析了系统的工作过程.     

Co-Word中图文混排的文档一致性研究*

近年来,人们设计各类算法来实现协同编辑中的文本一致性维护,而关于Word中图文混排的研究相对较少。本文提出,对Word中的图片对象和文字对象重新建模、分别存储,以行作为单位设置文档中对象的摆放位置,并通过算法消解各类图片对象和文字对象间的位置冲突,实现图文混排与各站点的一致性。本文在Co-Word原型系统中增加了图文混排支持,并通过实例分析来讨论策略的执行流程。     

一种扩展单用户应用程序实现协同编辑的方法

为了实现协同编辑,提出了一种对单用户应用程序进行扩展的方案。方案支持多个用户间无限制的协同编辑,使用操作变换机制维护数据的一致性。为了能充分利用操作变换机制,在单用户应用程序的外部设置了一个线性表用以索引文档中的对象;同时在控制算法层对David Sun的扩展OT算法进行了改进,以更好的支持对具有复杂对象结构的文档的共享控制。     

扩展RBAC模型在文档管理中的应用

对传统的基于角色的访问控制模型进行了分析,结合电子文档安全管理的特点,提出了一种新的基于角色的访问控制模型。该模型对典型RBAC模型进行了扩展,在角色与操作目标之间引入了文档操作集概念,通过对文档进行封装处理来简化权限分配工作。在给出了扩展RBAC模型的形式化定义后,对模型进行了分析和研究,最后介绍了该模型在文档管理系统中的应用。     

扩展RBAC模型在文档管理中的应用

对传统的基于角色的访问控制模型进行了分析，结合电子文档安全管理的特点．提出了一种新的基于角色的访问控制模型。该模型对典型酬模型进行了扩展，在角色与操作目标之间引入了文档操作集概念，通过对文档进行封装处理来简化权限分配工作。在给出了扩展RBAC模型的形式化定义后，对模型进行了分析和研究，最后介绍了该模型在文档管理系统中的应用。     

一种改进的水平分布式环境下基于同态加密的隐私保护算法

提出了一种改进的水平分布式环境下关联规则挖掘的隐私保护算法,该算法应用部分隐藏的随机化回答方法和同态加密技术,引入半可信第三方,将各站点的数据集进行扰乱和隐藏,并将数据的水平格式表示转换成垂直格式表示,通过位运算计算局部支持数,利用Paillier算法计算全局支持数。所提算法具有站点之间无须通信、支持数计算效率高、I/O操作次数少以及传输安全等优点。实验结果表明,所提算法提高了局部支持数的计算效率并减少了I/O操作次数。     

协同三维几何建模动态访问技术研究*

为解决协同设计过程中几何模型的动态访问问题,提出一种基于Web的协同设计环境下三维几何建模动态访问的分布式体系结构、异类CAD系统之间的动态数据交换组织模式。同时,提出一种面向对象的基于优先权限的乐观并发控制协议,保证模型动态访问在各站点操作的执行结果之间的一致性。在这些技术的共同作用下实现了协同三维几何建模动态访问技术,并通过具体实例验证了该技术的可行性。     

基于RBAC的SSO统一权限管理方法

针对RBAC(role_based access control)模型不能直接应用到SSO(single sign_on)系统中的问题,分析了RBAC模型的权限获取方式,指出不能直接应用的原因.引入XML文档存储用户在系统中的权限,改进用户权限获取方式及流程,定义权限验证方法统一接口,降低RBAC模型同应用系统的耦合性,提出了改进的RBAC统一权限管理模型和实施方法,并在实际应用中得以实现和验证.     

文档管理系统中小粒度授权机制的研究

提出了操作权限分类的方法和标准,结合文档管理的业务特点,进行了基于文档结构树的授权业务建模;为求解权限管理的基本问题公式,建立了资源可拓展的、分级授权的授权机制,定义了授权机制的粗规则和业务逻辑接口,实现了树型资源等复杂资源系统的权限分配方式。     

用页组拓扑平均距离改善页面聚类算法

提出一种支持站点结构优化的页面聚类改进算法,通过引入图论中的拓扑平均距离,量化评估与挖掘站点结构中访问效率较低的内容文档集合为结构优化的兴趣页组,挖掘的页组具有更高的兴趣性,并将兴趣页组挖掘算法融入到拓扑优化算法中.实验结果表明改进算法能更好地优化站点结构,较一般算法收敛性好.     

基于虚拟机监控器的Windows剪贴板操作监控

针对现有剪贴板操作监控无法抵御内核层攻击,且所采取的单一保护策略无法满足现实需求的问题,提出一种基于虚拟机监控器(VMM)的文档内容剪贴板操作监控技术,并提出基于剪贴板操作监控的电子文档分级保护策略。首先,通过修改影子寄存器的方法在VMM层截获并识别系统调用;其次,监控文档打开操作建立进程标识符和文档路径之间的映射表,并在截获到剪贴板操作后通过进程标识符解析文档路径;最后,根据电子文档分级保护策略对剪贴板操作进行过滤。实验结果表明,监控系统给客户机文件系统带来的性能损耗随着文件读写块的增大而减小,当读写块大小达到64 KB以上时,客户机性能损耗在10%以内,对用户影响不大。     

基于Client/Server的物资库存管理系统

基于Client/Ser ver的物资库存管理系统 ,采用独特且符合实际的设计思想 ,实现了物资到货之后网上入库、审批、申领、出库、退库一条龙操作 ;“两阶段”权限设置的访问控制策略更好地保证了系统的安全性管理 ;采用Client/Server模型的数据库管理系统 (DBMS)及基于事务概念的锁方法处理并发控制 ,实现了多用户同时访问系统     

基于JDBC数据库连接池的自适应管理策略研究

通过分析现有数据库连接池在参数配置、管理策略等方面的不足,提出一种自适应的连接池管理策略。从配置参数调整、设置监听线程和运行日志等管理方案的实施,弥补了现有连接池技术的不足。运行测试证明,自适应管理策略能减少系统响应时间,降低系统资源的开销,从而提高系统的整体性能。     

A framework for a feedback process to analyze and personalize a document vector space in a feature extraction model

In this paper, we present a framework for a feedback process to implement a highly accurate document retrieval system. In the system, a document vector space is created dynamically to implement retrieval processing. The retrieval accuracy of the system depends on the vector space. When the vector space is created based on a specific purpose and interest of a user, highly accurate retrieval results can be obtained. In this paper, we present a method for analyzing and personalizing the vector space according to the purposes and interests of users. In order to optimize the document vector space, we defined and implemented functions for the operations of adding, deleting and weighting the terms that were used to create the vector space. By exploiting effectively and dynamically the classified-document information related to the queries, our methods allow users to retrieve relevant documents for their interests and purposes. Even if the search results of the initial retrieval space are not appropriate, by applying the proposed feedback operations, our proposed method effectively improves the search results. We also implemented an experimental search system for semantic document retrieval. Several experimental results including comparisons of our method with the traditional relevance feedback method is presented to clarify how retrieval accuracy was improved by the feedback process and how accurately documents that satisfied the purpose and interests of users were extracted.     

基于分布式网络的电子文档安全管理系统的应用研究

本文使用XML语言和加解密技术提出了一种基于分布式网络的文档安全管理系统,它通过网络管理重要文档的使用权限和放发许可证制度实现对重要电子文档的保护。与目前使用的电子文档安全管理系统相比较,本系统具有良好的安全性、扩展性和易用性。     

A relationship framework and application in between strategy and operational plans for manufacturing industry

The objective of this paper is to develop a system that calculates a company’s strategic manufacturing performance using indicator values of competitive priorities classified according to manufacturing players and their weights and to determine strategic operations plans to guide short-term decisions based on performance and indicator values. A framework is designed that measures strategic manufacturing strength and links these competitive priorities to manufacturing strategy to plan operations that are compatible with the manufacturing strategy. This framework is applied in a panel furniture company. Quantitative data are obtained from Enterprise Resource Planning database. This work provides a new, more structured methodology with greater quantification and new insights. It is hoped that this decision support system helps that managers of a company in their strategic operations plans decision-making as they develop manufacturing capabilities against competitors. This study eliminates several gaps between the academic literature and current management practice, suggesting that researchers should consider the impact of theory on the process of strategy operations planning. It also offers a way for organizations with respect to determine strategy operations planning according to their current performance measurement systems. This study includes a different approach than those described in the literature because it includes a conceptual model, novel methods used in performance calculation and decision-making related to strategic operations plans.     

综合信息平台关键技术研究

现有的ERP等技术解决了企业业务流的传递,但没有充分挖掘并得到有效利用,系统间个别功能冗余,部分流程重复、交错。本文提出通过业务集成和信息集成建立综合信息平台,并对其中的关键技术——单点登录、行政办公与文档管理以及EAI进行研究和实现,在实际应用中取得了良好的效果。     

对基于多平台补丁分发系统中的补丁管理服务的研究

本文对目前基于多平台补丁分发系统中补丁管理服务存在的问题提出了一种改进方法。通过建立一个专门的检查机制检测补丁安装情况,为每个补丁建立一套特征类,通过该特征类别检查补丁是否安装,并保证由主分发服务器分发到所有从分发服务器,客户端可以检测并选择需要安装的文件,从而改进了分发控制策略,提高了分发效率。     

On-site text classification and knowledge mining for large-scale projects construction by integrated intelligent approach

A large-scale project produces a lot of text data during construction commonly achieved as various management reports. Having the right information at the right time can help the project team understand the project status and manage the construction process more efficiently. However, text information is presented in unstructured or semi-structured formats. Extracting useful information from such a large text warehouse is a challenge. A manual process is costly and often times cannot deliver the right information to the right person at the right time. This research proposes an integrated intelligent approach based on natural language processing technology (NLP), which mainly involves three stages. First, a text classification model based on Convolution Neural Network (CNN) is developed to classify the construction on-site reports by analyzing and extracting report text features. At the second stage, the classified construction report texts are analyzed with improved frequency-inverse document frequency (TF-IDF) by mutual information to identify and mine construction knowledge. At the third stage, a relation network based on the co-occurrence matrix of the knowledge is presented for visualization and better understanding of the construction on-site information. Actual construction reports are used to verify the feasibility of this approach. The study provides a new approach for handling construction on-site text data which can lead to enhancing management efficiency and practical knowledge discovery for project management.     

Software release management for component‐based software

Software release management is the process through which software is made available to and obtained by its users. Until now, this process has been relatively straightforward. However, the emergence of component‐based software is complicating software release management. Increasingly, software is constructed via the assembly of pre‐existing, independently produced, and independently released components. Both developers and users of such software are affected by these complications. Developers need to accurately document the complex and changing dependencies among the components constituting the software. Users must be involved in locating, retrieving, and assembling components in order to appropriately bring the software into their particular environment. In this paper, we introduce the problem of release management for component‐based software and discuss SRM, a prototype software release management tool we have developed that supports both developers and users in the software release management process. Copyright © 2002 John Wiley & Sons, Ltd.