关于指数分布无失效数据的一种Bayes分析

对指数分布无失效数据给出了一种新的处理方法:用Bayes方法寻求指数分布情况下的拟累积失效数的估计,从而获得无失效情况下未知参数的修正极大似然估计.     

试论楼层局部渗漏与防治

文章从设计和施工角度分析了产生楼层局部渗漏的原因,针对产生渗漏的原因,从施工材料的选用、施工工艺及施工管理等方面论述了防止楼层局部渗漏所采取的一系列措施。     

A data model for regions with indeterminate boundaries

Most of spatial phenomena like natural vegetation units and land use areas constantly change over time and have uncertainty spatial extents. Till now,a considerable number of data models have been proposed for spatial objects with sharp boundaries as well as with indeterminate boundaries. However,they mainly concern space and time or space and fuzziness and not yet integrate them into a single unified framework. This paper introduces a formal definition of the conceptual fuzzy spatiotemporal data model,called FSTDM for fuzzy regions based on fuzzy set theory. We also contribute a method of manipulating queries with the presence of both temporal predicate and fuzzy spatial predicate in the condition clause efficiently. We then implement a prototype system. Through the experimental results,we prove that our work can be used to build a specialized system such as GIS,spatial database,and so on.     

A data model for regions with indeterminate boundaries

Most of spatial phenomena like natural vegetation units and land use areas constantly change over time and have uncertainty spatial extents. Till now, a considerable number of data models have been proposed for spatial objects with sharp boundaries as well as with indeterminate boundaries. However, they mainly concern space and time or space and fuzziness and not yet integrate them into a single unified framework. This paper introduces a formal definition of the conceptual fuzzy spatiotemporal data model, called FSTDM for fuzzy regions based on fuzzy set theory. We also contribute a method of manipulating queries with the presence of both temporal predicate and fuzzy spatial predicate in the condition clause efficiently. We then implement a prototype system. Through the experimental results, we prove that our work can be used to build a specialized system such as GIS, spatial database, and so on.     

数据网格环境下的一种动态备份模型

在常见的层次拓扑结构的数据网格环境中提出一种动态备份模型,实现了备份的自动创建、删除和更新,优化了备份的放置策略,并为用户数据访问自动选择文件或备份服务。     

A data model for regions with indeterminate boundaries

Most of spatial phenomena like natural vegetation units and land use areas constantly change over time and have uncertainty spatial extents. Till now, a considerable number of data models have been proposed for spatial objects with sharp boundaries as well as with indeterminate boundaries. However, they mainly concern space and time or space and fuzziness and not yet integrate them into a single unified framework. This paper introduces a formal definition of the conceptual fuzzy spatiotemporal data model, called FSTDM for fuzzy regions based on fuzzy set theory. We also contribute a method of manipulating queries with the presence of both temporal predicate and fuzzy spatial predicate in the condition clause efficiently. We then implement a prototype system.Through the experimental results, we prove that our work can be used to build a specialized system such as GIS, spatial database, and so on.     

公路隧道防渗漏质量控制

为控制公路隧道的渗漏，结合工程实践研究了公路隧道的防渗漏问题，提出防渗漏工作应贯穿于隧道施工全过程的思路。给出施工过程中防渗漏环节的质量控制方法，重点介绍CPE防水板、排水管、纵向排水盲沟的施工要点及高抗渗耐蚀二次衬砌混凝土的应用。研究结果表明，公路隧道的防渗漏工作，应该向前扩展至铺设防水层之前的开挖和初期支护阶段，向后延伸至二次衬砌阶段。     

面向制造系统的多级物流配送模型及算法

针对制造系统供应链管理中多级配送运输存在的问题,采用仿真的方法进行模拟,设计一种合理算法,分析了供应链中物料沿着从最初的供应商流向其下游不同的生产商、装配商,完成整个制造形成产品的过程,揭示了生产商流向其下游批发商、零售商,最终到达用户手中实现其价值的规律.研究结果表明,这种多级配送模型和优化调度算法,对解决大规模配送决策问题具有可行性.     

一种实时高速数据互连模型

给出了一种基于数据流的实时高速数据互连模型。该模型将模块间互连的地址和控制信号统一为一个与数据同步的信号，使得结构简单，互连接口相似，可以实现数据处理中常用的功能。基于该模型的模块容易扩展，重用性好，特别适用于高速实时处理。最后，通过一个200MSPS高速采集实时存储的例子具体说明了模型的应用。     

运用多维数据模型实现数据集市

文中阐述了数据集市、多维数据模型的基本概念和技术 ,探讨了一种用多维数据模型实现数据集市的方法。最后 ,给出了一个数据集市的应用实例     

蜂窝状无线网集成语音数据业务的资源分配模型

本文提出了一个全新的呼叫接入方案,以有效使用蜂窝技术和无线网络。这个方案为两种存取网络采取了不同的资源分配策略,根据不同的呼叫层级服务质量(QoS)需求,限制新的水平或垂直的用于信号切换的语音数据的呼叫到达。数值结果显示,与没有集成的网络模型相比,本方案更加有效,对语音数据用户而言满足所有达到最大值的QoS需求。     

数据仓库中多维数据模型的设计

多维数据模型是数据仓库和联机分析处理中的一个重要环节。文章提出了一种新的多维数据模型。在该模型中，基于维与事件的关系，描绘了多维事件关系图，并利用非奇异聚集偏序集簇定义了维的结构。结合小灵通客户流失问题，给出了该模型的具体的实现。     

A Digital Right Management Model for Distribution of Digital Audiovisual Content

0 IntroductionDue to the success of Internet technology and the emer-gence of wide band network,downloading encoded dig-ital audiovisual content files via HTTP,FTP,etc ,had gainedfavor amongInternet users because of thei mmediate access todesired content . Digital Right Management (DRM) system,can satisfy the content provider by encrypting digital audiovi-sual content andli miting access to onlythose people who haveacquired a proper license to play backthe content[1].DRMas defined bythe …     

一种双时态时空模型和索引机制

建立了一种支持三维空间和双时态的时空模型，给出了模型的形式化定义，讨论了时空数据类型，并在此模型上提出了一个基于R树的统一时空索引（UST-TREE）机制，定义了节点结构，并分析、描述此索引的结构及原理，所提出的索引机制可大大提高数据的检索效率，减少了冗余信息。     

时空数据模型的初步设计

时空数据库用于模拟和查询位置或形状随时间改变的移动对象。提出了用于表示移动对象的时空数据类型和扩展数据类型。并在此基础上，对时空操作符也作了相应的概括。该数据模型便于实现，并能较好地支持时空查询。     

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 werepresent maps in three levels：scale-view,maps in a set of map layers,named Scale-Lastly,a prototype Web-Based GIS using described briefly.     

粗糙数据的Max-Min分级模型

针对复杂制造系统生产线优化调度等众多实际领域中的不确定性处理问题,在分析了现有进化计算机制的特点以及存在的不足基础上,建立了一种数组分级的Max-Min模型,讨论了该模型中两个基本参数(分级参数和分级调节参数)的性质及其作用,证明了在分级参数充分大时,Max-Min分级模型即为某种意义下的比例分级。分析结果表明,Max-Min分级模型是一种可反映一定松弛意识的较比例分级更广泛的分级方法,适应于不确定信息的分类问题,弥补了现行分级方法不适合粗糙数据的不足。最后给出了不确定环境中进化机制的个体复制方案。     

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.     

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.     

数据仓库安全需求模型研究

研究了数据仓库安全需求的形式化描述．阐述了数据仓库的几种主要安全需求,在多维表达式查询语言(MDX)的基础上,使用与微软SQL SERVER数据库中CREATE CUBE语句类似的语法定义了一种多维安全约束语言(MDSCL)来描述数据仓库的安全策略,以典型的销售立方体为例,给出了多维安全约束语言支持的几种安全约束类型．结果表明,用多维安全约束语言表示的安全模型符合数据仓库的开放本质,能够描述数据仓库的大部分安全需求,实用性强,方便系统管理员、设计人员及终端用户理解和运用．