计算机控制的气相紫外光电子能谱(UPS)仪数据采集与分析系统的研制

以IBM－PC兼容机及自行设计的数据接口卡改造气相紫外光电子能谱仪，设计了一套集数据采集、数据处理、图形显示和打印于一体的测试系统，应用Windows支持下的VisualBasic3．0编程技术，编制了具有用户友好界面且操作灵活的软件。在数据采集部分，采用相关函数的方法补偿了多次扫描中谱峰的漂移；在数据处理部分，引入三次自然样条函数计算谱峰的面积，从而进行港的剥离，本系统在实际运行中获得了良好的效果。     

消除结构冗余的XML数据库模式规范化设计

XML数据库模式规范化设计是给出一个能很好地表示数据间依赖关系并消除了冗余的XML模式或DTD的集合．目前这一领域的研究并没有对XML数据库模式中的数据依赖和冗余进行专门的分析．引人标识符分别表示XML模式中的元素和属性，分析XML数据库模式的结构冗余：局部冗余、传递冗余和不规则；并在此基础上，定义XML数据库模式第3范式(3NF)，给出并验证其规范化设计算法．     

机动车辆安全性能全自动检测系统

本文介绍了全自动汽车检测线的计算机网络控制系统，描述了系统的组成及设计。该系统具有自动要集数据；控制检测过程；打印检测报告单及合格证的功能，并配置了数据库对检测数据实施动态管理。     

基于0RDB的GIS空间数据组织与实现

分析了关系数据库和面向对象数据库对各类信息存储的适应性；根据GIS对空间复杂数据存储和管理的需要，设计和实现了基于对象关系数据库ORDB的GIS底层数据库；并对部分关键表的功能和对象的方法进行了较详尽的描述。     

XML与数据库双向接口的研究和实现

XML同数据库技术结合体现了一种趋势,目的就是如何使数据更通用,能被异构系统、任何应用都接受。本文设计了一个接口来实现数据库与XML双向数据交换,并对该接口进行了详细的分析、设计；然后运用相关的技术来实现接口。     

决明子指纹图谱数据库的实现与应用

利用Microsoft Visual Foxpro 6.0软件开发出决明子指纹图谱数据库,以存储和管理指纹图谱数据,并利用数学方法对指纹数据分析处理.该数据库针对中药复杂组分的分析、鉴定,建立相似度评价系统,具备数据录入、参数设置、指纹图谱集及标准指纹谱的动态生成、差异率表及相似度检验、相似度评价统计图及报表、数据备份与数据输出等功能,实现了数据的标准化和动态更新.系统采用面向对象的设计方法作为开发工具,系统界面清晰,操作简便.实践证明,应用数据库跟踪和控制决明子的质量有效,并可在其它中药质量控制领域应用.     

基于车辆行驶数据的驾驶人行为谱分析方法

针对我国驾驶人行为谱的研究尚不完善，专业领域内没有相应的行为谱分析工具的问题，提出了一套针对营运客车的完整的驾驶人驾驶行为谱体系并设计了一套分析工具。首先，设计并定义了驾驶人行为谱的特征指标和评价指标；其次，给出了驾驶人行为谱的特征指标分析、计算方法，采用基于马尔可夫链蒙特卡洛采样和离群点剔除的K-means算法对驾驶人的驾驶风格进行分析，采用回归学习对驾驶人的驾驶技能进行分析；然后，设计了基于车联网、大数据的驾驶人行为谱的基础数据采集和预处理方法；最后，采用Java语言、Spring MVC架构开发出驾驶人行为谱分析工具。将机器学习中的数据挖掘、数据分析算法与交通安全领域相结合，对完善我国驾驶人行为谱框架体系具有理论意义，为我国驾驶人行为谱的研究提供了一个科学、定量化分析的工具，对交管部门规范驾驶人驾驶行为、提高道路安全指数、制定合理的交通安全管理策略具有指导意义。     

组合夹具设计工程数据库研究

一、概述组合夹具设计工程数据库是满足组合夹具设计与装配管理、组合夹具元件管理的数据库，工程数据库是组合夹具设计系统的一个重要组成部分。工程数据库系统包括工程数据库、工程数据库管理系统和工程数据库的终端用户。组合夹具设计工程数据库存储组合夹具的图形、数据、组合夹具元件的装配关系、位置信息及组合夹具元件的图形及数据信息。工程数据库管理系统是实现工程数据库的维护与管理的系统。终端用户则是使用工程数据库的用户。通常工程数据库可以划分为三级结构：公共库、项目库和私用库。公共库是设计中间用到的标准元件库；项…     

基于Java的员工信息数据库管理系统的开发与设计

员工信息数据管理系统在并发用户数量较多时，数据管理事务响应时间较长，降低了企业人力资源管理效率，为此设计基于Java的员工信息数据库管理系统。首先，设计员工资料信息登记与导入流程，实现信息管理功能；其次，建立Java数据库，执行结构化查询语言（Structured Query Language,SQL）语句，存储并管理员工信息数据；最后，进行对比分析。实验结果表明，该系统在并发用户数量较多的情况下，数据管理事务响应时间仍较短。     

基于Web的痕量气体特征光谱数据库

痕量气体特征光谱是应用光谱分析技术检测大气污染的基础,与大气痕量气体测量、空气质量评估等诸多环境问题密切相关。在研究特征光谱基本参数的基础上,设计了基于Web的痕量气体特征光谱数据库的数据模型、系统结构和模块组成,完成了远程交互查询,在线预览谱线绘图和下载结果谱线数据等功能,为对比分析痕量气体分子吸收谱线提供了更有效的途径。     

基于本体的异构数据库集成方法

随着数据库种类的增多,在查询不同数据库时,经常碰到用户术语和数据库术语不匹配的问题.提出了一种基于本体理论的异构数据库集成方法,该方法利用了一个全局字典,建立各局部数据库的本体,通过中间件和局部查询代理处理用户请求,用他们自己的术语(不精确查询)进行查询.给出了本体模型和查询处理算法以及原型系统的实现.     

Concept Hierarchy-Based Text Database Categorization

Document categorization as a technique to improve the retrieval of useful documents has been extensively investigated. One important issue in a large-scale metasearch engine is to select text databases that are likely to contain useful documents for a given query. We believe that database categorization can be a potentially effective technique for good database selection, especially in the Internet environment where short queries are usually submitted. In this paper, we propose and evaluate several database categorization algorithms. This study indicates that while some document categorization algorithms could be adopted for database categorization, algorithms that take into consideration the special characteristics of databases may be more effective. Preliminary experimental results are provided to compare the proposed database categorization algorithms. A prototype database categorization system based on one of the proposed algorithms has been developed. Received 9 November 2000 / Revised 15 February 2001 / Accepted in revised form 29 May 2001     

数据库自然语言查询界面

数据库技术的普及使得用户对数据库应用界面的要求越来越高，以往的几类接口都需要用户有较高计算机知识水平，而且必须经过一定的培训，这样就会造成人力物力的浪费而且不利于计算机的普及。本文探讨的是一种更为方便简洁不秀学习即可操作的自然语言界面。     

The design of optimal access paths for relational databases

A generalized model for the performance optimization of physical relational database access has been developed and implemented. The model consists of a set of algorithms and cost equations. It assists the database designer in specifying and selecting optimal access schemes within given systems' constraints. The model is an extension of previous work. It is more comprehensive and flexible. It addresses problem that have not been considered in previous models; it integrates into one model aspects that were treated individually before, and it produces database access configurations that can work within certain given system constraints.     

基于C/S架构的紫外线网络监控系统

为了实时了解河南省各地的紫外线强度指数变化,采用Borland C Builder 6.0编程,基于Client/Server编程结构实现紫外线监控网络系统.该系统可及时分析各地的紫外线强度变化,进行历史数据库查询,研究各地的紫外线强度季节性变化规律.     

A lossless ECG data compression technique using ASCII character encoding

A software based lossless ECG compression algorithm is developed here. The algorithm is written in the C-platform. The algorithm has applied to various ECG data of all the 12 leads taken from PTB diagnostic ECG database (PTB-DB). Here, a difference array has been generated from the corresponding input ECG data and this is multiplied by a large number to convert the number of arrays into integers. Then those integers are grouped in both forward and reverse direction, out of which few are treated differently. Grouping has been done in such a way that every grouped number resides under valid ASCII value. Then all the grouped numbers along with sign bit and other necessary information are converted into their corresponding ASCII characters. The reconstruction algorithm has also been developed in using the reversed logic and it has been observed that data is reconstructed with almost negligible difference as compared with the original (PRD 0.023%).     

与数据库相联的平衡表面图绘图软件

平衡表面图是作者近年提出的一种热化学数据图示方法,用于湿法冶金络合物体系矿物浸出或金属离子沉降的条件分析.本文提出一个与微机冶金热化学数据库相联的绘图软件,说明算法与绘图的基本原理及三维数组的生成方法.以铜-氯-水体系为例展示了绘图结果及其意义.     

Exploring into programs for the recovery of data dependenciesdesigned

Data dependencies play an important role in the design of a database. Many legacy database applications have been developed on old generation database management systems and conventional file systems. As a result, most of the data dependencies in legacy databases are not enforced in the database management systems. As such, they are not explicitly defined in database schema and are enforced in the transactions, which update the databases. It is very difficult and time consuming to find out the designed data dependencies manually during the maintenance and reengineering of database applications. In software engineering, program analysis has long been developed and proven as a useful aid in many areas. With the use of program analysis, this paper proposes a novel approach for the recovery of common data dependencies, i.e., functional dependencies, key constraints, inclusion dependencies, referential constraints, and sum dependencies, designed in a database from the behavior of transactions, which update the database. The approach is based on detecting program path patterns for implementing most commonly used methods to enforce these data dependencies     

嵌入式数据库在数控系统中的实现与应用

针对目前数控系统普遍采用文本文件格式存储管理数据方式上存在的问题,提出在嵌入式数控系统中采用基于MySQL数据库管理数据的全新技术解决方案。在RTLinux操作系统下,用MySQL设计机床数据库,创建用户接口,实现数据库与基于GTK+库开发的用户操作界面的连接,在对数据库最小化裁剪后,成功完成了向嵌入式数控系统硬件平台的移植。结果表明:嵌入式数控系统的数据库管理方式实现了对大量参数的有效管理,极大地改善了系统的性能。     

Wizard: a database inference analysis and detection system

The database inference problem is a well-known problem in database security and information system security in general. In order to prevent an adversary from inferring classified information from combinations of unclassified information, a database inference analyst must be able to detect and prevent possible inferences. Detecting database inference problems at database design time provides great power in reducing problems over the lifetime of a database. We have developed and constructed a system called Wizard to analyze databases for their inference problems. The system takes as input a database schema, its constituent instances (if available) and additional human-supplied domain information, and provides a set of associations between entities and/or activities that can be grouped by their potential severity of inference vulnerability. A knowledge acquisition process called microanalysis permits semantic knowledge of a database to be incorporated into the analysis using conceptual graphs. These graphs are then analyzed with respect to inference-relevant domains we call facets using tools we have developed. We can determine inference problems within single facets as well as some inference problems between two or more facets. The architecture of the system is meant to be general so that further refinements of inference information subdomains can be easily incorporated into the system