A solution of spatial query processing and query optimization for spatial databases

Recently,attention has been focused on spatial query language which is used to query spatial databases. A design of spatial query language has been presented in this paper by extending the standard relational database query language SQL. It recognizes the significantly different requirements of spatial data handling and overcomes the inherent problems of the application of conventional database query languages. This design is based on an extended spatial data model,including the spatial data types and the spatial operators on them. The processing and optimization of spatial queries have also been discussed in this design. In the end,an implementation of this design is given in a spatial query subsystem.     

On the Analysis of Discourse and its Application

This paper firstly gives a brief introduction about the discourse analysis and its importance, and then focuses on the analysis of an scientific article by use of the problem-solution pattern and lexical signalling. At last, the analysis is applied to the language teaching in reading and writing which assures its importance.     

Research on On-line detection system for natural gas pipeline

Four methods for testing the thickness and defect of pipeline are compared and analyzed in this paper. The testing principle of magnetic leakage flux based on electromagnetism is discussed in detail. From the experiments of sensor character, the effects caused by some factors are found, which give some important information for sensor design, and this method is proved reasonable and effective. The mechanical and electrical structures of inspection equipment, as well as its working principle and technical features are introduced. In this paper, control flow and software design are discussed, too. This detection system has been successfully developed. Experiments show that this detection system has high resolution and can be put into practice.     

THE APPLICATION LAYER AND FILE TRANSFER SERVICE

The authors, first of all, discuss the importance of implementing application layer protocol ofLAN. A study in this area is required in order to speed up its practical uses as well as further de-velopment in the direction. The present paper is a brief report of the authors' design methodologyand development of File Transfer Access and Management in reference to the ISO / OSI Moduleand implementation of its service protocol in a LAN,     

A new design method for asymmetrical head gradient coils used for superconducting MRI scanner

A novel approach of asymmetrical gradient coil design for head imaging in MRI (magnetic resonance imaging) is presented in this paper. The design is based on a modified target field method in which the stream function is introduced to replace Blaine's scheme for the length control. The transverse head coil calculated by this method has a high performance. The coil efficiency is 0.41 mT/m/A and the inductance is 512 μH. The coil has an inner diameter of 32 cm and a length of 45.8 cm. The size of the ROU (region of uniformity) is 20 cm along the transverse direction and 17 cm along the axial direction and it is close to one end of the coil. The ROU of the coil matches the ROI (region of interest) of human head very well. Compared with previous designs, our design has relatively high performance and the overlap between the ROU and the ROI is larger (the overlap percent is 95 % ).     

THE HARDWARE ＆ SOFTWARE DESIGN AND IMPLEMENTATION OF A NEW TYPE INTERFACE FOR THE CASSETTE TAPE RECORDER

This paper analyzes in detail the operating principle and characteristics of hardware and software of a new type interface for the cassette tape recorder, which has been developed by this author for the 8097BH target prototype machine. It discusses the design of the audio cassette tape recording format and some important aspects which must be taken care of in software for reading the cassette tape. The paper also illustrates debugging methods thoroughly.     

Design and implementation of two-level metadata server in small-scale cluster file system

The reliability and high performance of metadata service is crucial to the store architecture. A novel design of a two-level metadata server file system （TTMFS） is presented, which behaves high reliability and performance. The merits both centralized management and distributed management are considered simultaneously in our design. In this file system, the advanced-metadata server is responsible for manage directory metadata and the whole namespace. The double-metadata server is responsible for maintaining file metadata. And this paper uses the Markov return model to analyze the reliability of the two-level metadata server. The experiment data indicates that the design can provide high throughput.     

A PSL Ontology-based Shop Floor Dynamical Scheduler Design

Due to the complex, uncertainty and dynamics in the modern manufacturing environment, a flexible and robust shop floor scheduler is essential to achieve the production goals. A design framework of a shop floor dynamical scheduler is presented in this paper. The workflow and function modules of the scheduler are discussed in detail. A multi-step adaptive scheduling strategy and a process specification language, which is an ontology-based representation of process plan, are utilized in the proposed scheduler. The scheduler acquires the dispatching rule from the knowledge base and uses the buildin on-line simulator to evaluate the obtained rule. These technologies enable the scheduler to improve its fine-tune ability and effectively transfer process information into other heterogeneous information systems in a shop floor. The effectiveness of the suggested structure will be demonstrated via its application in the scheduling system of a manufacturing enterprise.     

8096的快速傅立叶变换汇编程序设计

使用单片机采集的数据进行实时快速傅立叶变换在仪表的智能化控制中具有重要应用。笔者给出了8096汇编语言设计快速傅立叶变换程序的思路和经验。以8096的四字节浮点数运算功能实现快速傅立叶变换,选用了倒序输入时间抽取快速傅立叶变换算法,采用通常的基2运算。快速傅立叶变换程序主要由三部分组成:倒序处理、主程序、碟形运算子程序。倒序处理生成倒序序列;主程序提供碟形运算的入口和参数;碟形运算作为快速傅立变换算法的核心在很大程度上决定主程序的实时性,并给出了变换核心的碟形算子程序。编制的8096汇编语言64点快速傅立叶变换程序已用于某石油仪器。这方法适用于点数不大的快速傅立叶变换的编程和其他汇编语言的快速傅立叶变换的编程。     

基于B/S模式的网上销售系统设计

介绍了网上销售系统设计过程,系统的设计采用了B/S结构,并选用ASP.NET作为开发语言,使整个系统易于维护,可扩展性强,同时系统采用了SQL Server 2000作为数据库服务器,使系统性能更稳定,可靠性高。     

B/S数据传递技巧

B/S程序数据的传递是动态网站设计中的关键技术,使用超文本置标语言中表单的提交,结合ASP技术对数据库的访问,方便了B/S程序间的数据传递.     

面向实时控制的FORTH语言在8098单片机上的实现

作者通过对FORTH系统的特点、功能及其内部结构的分析,提出了一种用于MCS-8098单片机上的实现方法。文中还详细叙述了一种中断管理方法,并用实例介绍了中断程序的设计特点。     

点阵式液晶显示器画线程序设计

介绍了点阵式液晶显示器画线程序设计思想和框图，并给出了点阵式液晶显示器ＤＭＦ５００１用ＰＬ／Ｍ语言编写的８０９８单片机画线程序。     

8098单片机的可编程A/D与D/A系统的设计与实现

介绍一种基于８０９８单片机可编程Ａ／Ｄ与Ｄ／Ａ系统的设计与实现。这种系统是８０９８单片机与微机采用松藕合方式连接的Ａ／Ｄ与Ｄ／Ａ转换接口电路板,具有电路设计简单、性能稳定,功能齐全等特点。     

实时高可靠指令/响应型微机网络研究

介绍一种应用于实时控制系统的高可靠性微型计算机网——MIL-STD-1553B指令/响应型数据总线,讨论了系统的特点、性能和设计原理,包括数据总线的结构、通讯协议、数据总线关键部件——总线接口的软、硬件设计以及光、电两种传输介质。应用表明,该系统性能良好,适用于实时性及可靠性要求较高的场合。     

心率变异性检测系统的研究

以１６位单片机８０９８作为核心处理芯片，采用宏汇编语言编写程序软件，设计并制作了一台短时心率变异性测定仪．在其数学处理过程中，应用了混沌理论和小波变换技术．该测定仪具有体积小、重量轻、集成度高、抗干扰能力强、稳定性好及安全可靠等特点．它完全可以替代国外同类产品而用于临床检测     

基于C/S与B/S的成人高教MIS的设计与实现

针对成人高等教育管理的特点与遇到的问题，提出了基于COM 的C／S与B／S混合模式的成人高教管理信息系统的设计方案，通过引入COM 组件技术把C／S与B／S有机结合起来，使得软件的代码重用性得到了加强，且具有较高的效率与安全性，易于软件的升级与维护．目前，该方案已在广西师范大学成人教育学院成功实施，并获得了较好的效果．     

基于B/S结构的SIMS的软件设计与实现

基于B/S三层架构的学生信息管理系统(SIMS),采用的是ASP技术,并以VbScript作为主要脚本语言,系统的数据库使用的是Microsoft Office Access.系统功能完整,模块共分为系统管理、学籍管理、成绩管理、账号管理、数据管理和个人管理六个模块.文章首先简要阐述系统的研究背景与研究目的及意义,介绍一些与系统开发有关的技术与理论知识,随后详细介绍了该管理系统的设计与实现过程,包括后台数据库的设计、系统主页面的设计等.最后对系统进行测试,减少冗余,并对此次系统开发过程中遇到的问题以及解决的方法进行了叙述.