高校分布式数据库管理实验系统的设计与实现

目前,高校分布式数据库实验一般使用Oracle数据库管理系统.然而Oracle要经过复杂的数据管理和配置才能实现分布式数据库管理系统的技术和方法,也不利于学生对一些基本概念的理解.针对这一问题,设计并实现了基于C/S的同构型的高校分布式数据库管理实验系统,提出了系统的体系结构,定义了系统语法,并详细阐述了数据库字典、语法分析模块、定位模块等关键技术的设计.该系统能够满足高校分布式数据库实验的要求,对高校教学有一定的意义.     

Transaction Management in Distributed Database System POREL

This paper describes the architecture and implementation algorithm of a transaction managementsuhsystem (TM) in the distributed database system POREL.The TM has been reimplemented on VAX11/750.     

Parallel merging: algorithm and implementation results

An efficient parallel algorithm for merging two sorted lists is presented. The algorithm is based on a novel partitioning algorithm that splits the two lists among the processors, in a way that ensures load balance during the merge. The partitioning algorithm can itself be efficiently parallelized, allowing the solution to scale with increased numbers of processors. A shared memory multiprocessor is assumed. The time complexity for partitioning and merging is O(N/p + log N), where p is the number of processors and N is the total number of elements in the two lists. Implementation results on a twenty node Sequent Symmetry multiprocessor are also presented.     

飞行器几何数据库设计及其管理软件开发

设计基于局域网的飞行器几何数据库系统软件的关键,是在对飞行器几何数据分析研究的基础上,设计合理的数据库逻辑结构,以消除或减小数据的冗余数据。使用Visual Basic6.0和SQL Server编程技术开发出的飞行器几何数据库系统管理软件,建立了友好的人机交互界面,实现了局域网访问数据库的功能和合理的分层管理功能,使得飞行器几何数据的管理系统化,并强化了数据的安全性。     

计算机数据库系统在信息管理中的应用

21世纪是信息化的时代,也是科学技术迅速发展的时代.随着人们生活水平的不断提高,计算机的运用得到进一步的推广.加之,全球化的发展使得各个地区之间的竞争和合作增加,因此,其面临的信息量也越来越大.使用计算机数据库系统对相关的信息进行科学化的管理,可以提高信息管理的效率,降低人工管理的误差,也可以降低使用者的总成本.本文主要从该技术的相关释义、使用、建议等方面对二者进行简单的阐述.     

Emission inventory database management system using microcomputers

An emissions inventory database management system called EMIDBMS has been developed for storage, retrieval, and processing of air pollution emission data for both urban and industrial sources. It is a generalized user-friendly database system developed on a microcomputer using the query language of dBASE III Plus. Moreover, it is a relational interactive database which has been prepared and installed on an IBM PC/AT. The menu-driven option of the software allows the user easy access to the information for retrieval by simply executing the command files in a question/answer session. This could also provide air quality enforcement authorities a system for on-site use.EMIDBMS is comprised of a number of command and database files. The database files are designed to store data on all aspects of emission inventories, while the command files are designed for storage, processing, and retrieval of the various types of information stored in the database files. The emissions inventory data retrieved by EMIDBMS can either be used as input for an air pollution dispersion model installed on a microcomputer or can be transferred to an IBM mainframe for further use.     

Knowledge-based system for supporting statistical database management

In the development of the expert system described here, knowledge-based information processing has been approached from the point of view of database technology. The outlines and processes of arranging an economic national balances system are provided, and the problems encountered in applying the variables involved in such a process to an expert system are identified. The structure and architecture of the expert system are defined, and the problems of knowledge acquisition are discussed.     

分布式数据库在商业供应链系统中的应用

随着网络中数据库应用的发展,使得分布式数据库的应用领域得到快速的扩展。针对商业流通企业大规模、分散式经营以及集团化管理的模式,提出了在商业供应链系统中采用分布式数据库的结构设计方案,对供应链系统的数据库体系进行了分析,对在数据库设计过程中的一些关键问题进行探讨并给出了解决方法。以Oracle 9i数据库系统为例,介绍了采用增量复制、分组、半连接技术,进行数据复制、解决数据冲突以及进行查询优化的实现方法。     

HOLMES: A deduction augmented database management system

HOLMES is a database system based on object-relationship concept. The idea of a generalized schema is introduced. A uniform language, based on first order predicate calculus, intended to express both formulas of a generalized schema and users' queries is presented. This high level database language enables one to define a database application as a “theory” expressed by a set of formulas. Possibilities of the presented approach are discussed. Implementation problems are sketched.     

A database management system for residency applicant files

An automated system for recording information pertaining to applicants to the Internal Medicine Residency Program at Temple University Hospital was developed in 1983. Major objectives were to improve recordkeeping, filing, communication with applicants, and efficiency of the review committee's process. Reports generated have permitted tracking of the applicant pool throughout the recruiting season and collection of statistics which may be compared with prior years. The capacity of the Residency Office to market the Internal Medicine Residency Program through prompt, accurate, and personal communication with each applicant has been facilitated.     

HGDBMS: a human genetics database management system

Human genetics research involves a large number of complex data sets naturally organized in hierarchical structures. Data collection is performed on different levels, e.g., the project level, pedigree level, individual level, and sample level. Different aspects of a study utilize different views of the data, requiring a flexible database management system (DBMS) which satisfies these different needs for data collection and retrieval. We describe HGDBMS, a comprehensive relational DBMS, implemented as an application of the GENISYS I DBMS, which allows embedding the hierarchical structure of pedigrees in a relational structure. The system's file structure is described in detail. Currently our Melanoma and Chromosome 17 map studies are managed with HGDBMS. Our initial experience demonstrates the value of a flexible system which supports the needs for data entry, update, storage, reporting, and analysis required during different phases of genetic research. Further developments will focus on the integration of HGDBMS with a human genetics expert system shell and analysis programs.     

Parallel chaos optimization algorithm with migration and merging operation

Chaos optimization algorithm (COA) utilizes the chaotic maps to generate the pseudo-random sequences mapped as the decision variables for global optimization applications. A kind of parallel chaos optimization algorithm (PCOA) has been proposed in our former studies to improve COA. The salient feature of PCOA lies in its pseudo-parallel mechanism. However, all individuals in the PCOA search independently without utilizing the fitness and diversity information of the population. In view of the limitation of PCOA, a novel PCOA with migration and merging operation (denoted as MMO-PCOA) is proposed in this paper. Specifically, parallel individuals are randomly selected to be conducted migration and merging operation with the so far parallel solutions. Both migration and merging operation exchange information within population and produce new candidate individuals, which are different from those generated by stochastic chaotic sequences. Consequently, a good balance between exploration and exploitation can be achieved in the MMO-PCOA. The impacts of different one-dimensional maps and parallel numbers on the MMO-PCOA are also discussed. Benchmark functions and parameter identification problems are used to test the performance of the MMO-PCOA. Simulation results, compared with other optimization algorithms, show the superiority of the proposed MMO-PCOA algorithm.     

物流自动化管理系统的数据库设计

为实现仓储物流自动化管理系统的入库、出库、报表、储位查询、物品查询、客户查询、仓库及人员管理模块等功能模块,本文采用SQLSEVER2000数据库管理系统、微软公司的VS.NET的C#开发工具,利用其提供的各种面向对象的开发工具,其中最主要的是ADO.NET技术实现了基于电子标签技术的物流自动化管理系统后台数据库方面的开发任务。现场试验表明:本文所设计的物流自动化管理系统达到了预期要求。     

桥梁预警系统数据库分布式管理引擎设计

针对桥梁预警系统群体间协同工作对信息共享的需求,提出了基于分布式管理引擎的预警系统数据库设计方法,其中包括数据库集成的体系结构,分布式管理引擎的命令分解算法、单元模板、单元拼装模板、模型重构算法。最后通过模拟算例对分布式管理引擎的可实施性和有效性进行了验证。     

ACCESS2003数据库在图书信息管理系统中的应用

图书管理系统是信息化的产物,在图书馆的管理中具有重要的作用,是现代图书馆的标志性事物,对图书馆的发展起到了关键性的作用.本文主要阐述了ACCESS2003数据库在图书信息管理系统中的应用,供同行借鉴探讨.     

多媒体数据库管理系统MMDBMS关键技术分析

在多媒体数据库管理系统体系结构的基础上,分析了多媒体数据模型、特征提取与索引、多媒体检索等关键技术。