基于Caché数据库的医院信息系统的研究

医院信息系统（HIS）在医院管理及现代化建设中发挥越来越重要的作用。采用传统关系型数据库的HIS产品日益显示出种种不足,如响应速度太慢,维护费用昂贵。Caché数据库是一种面向对象型数据库,具有许多卓越的性能,不但加快了软件开发的速度,还解决了“阻抗失配”问题。另外由于Caché采用多维数组的存储方式以及位图索引等技术,使其在与关系型数据库的HIS对比中,展现出更大的优势,如响应速度加快,降低硬件成本,日常维护更加容易。     

基于UML的维护备件库存管理系统分析与设计

介绍了如何运用统一建模语言UML来分析和设计备件库存管理系统.以Microsoft Visio为工具,通过建立用例图、顺序图、类图、系统配置图,探讨了运用UML对库存管理系统进行建模的关键技术和优势所在.     

A Rice Growth Models (RGM) System by Object-Oriented Programming with Visual C ++

Object-oriented programming divides the crop production into subsystems and simulates their behaviors. Many classes were designed to simulate the behaviors of different parts or different physiological processes in crop production system. At the same time, many classes have to be employed for bettering user‘s interface. But how to manage these classes on a higher level to cooperate them into a perfect system is another problem to study. The Rice Growth Models (RGM) system represents an effort to define and implement a framework to manage these classes. In RGM system, the classes were organized into the model-document-view architecture to separate the domain models, data management and user interface. A single document with multiple views interface frame window was adopted in RGM. In the architectures, the simulation models only exchange data with documents while documents act as intermediacies between simulation models and interfaces.Views get data from documents and show the results to users. The classes for the different functions can be grouped into different architectures. Different architectures communicate with each other through documents.The classes for the different functions can be grouped into different architectures. By using the architecture,communication between classes is more efficient. Modeler can add classes in architectures or other architectures to extend the system without having to change system structure, which is useful for construction and maintenance of agricultural system models.     

基于面向对象思想的通用,高效推理机制

利用面向对象思想和技术处理不同领域的专家知识时，可采取相同的推理机制。因基专家知识的表示形式是相同的：都是由类和对象组成；对象是类的实例；不同层次的类之间具有继承性。据此我们实现了通用的推理机制，由它构成的推理机制可用于不领域的专家系统。由于充分运用了面向对象的继承思想，使得推理速度大大提高，而且结论符合实际。     

基于Caché数据库的医院信息系统的研究

医院信息系统(HIS)在医院管理及现代化建设中发挥越来越重要的作用。采用传统关系型数据库的HIS产品日益显示出种种不足,如响应速度太慢,维护费用昂贵。Caché数据库是一种面向对象型数据库,具有许多卓越的性能,不但加快了软件开发的速度,还解决了"阻抗失配"问题。另外由于Caché采用多维数组的存储方式以及位图索引等技术,使其在与关系型数据库的HIS对比中,展现出更大的优势,如响应速度加快,降低硬件成本,日常维护更加容易。     

Software for estimating reference evapotranspiration using limited weather data

The FAO-56 Penman-Monteith combination equation (FAO-56 PM) has been recommended as the standard equation for estimating reference evapotranspiration (ET₀). The FAO-56 PM equation requires the numerous weather data that are not available in the most of the stations. The main goal of this paper is to present the software for estimating reference evapotranspiration, focusing on the feature of using limited weather data. This is simple Windows-based and user-friendly software provides methods to estimate extra-terrestrial radiation, maximum sunshine hours, daily net radiation and daily/monthly ET₀. The program is written in C# and includes comprehensive technical documentation. The software is available for free download.The weather data for this study were obtained from CIMIS for Davis weather station. The reduced-set FAO-56 PM approaches and adjusted Hargreaves equation were compared to the full-set FAO-56 PM equation. The FAO-56 reduced-set PM ET₀ estimates were in closest agreement with FAO-56 full-set PM ET₀ estimates. The adjusted Hargreaves equation (AHARG) was found to be in very good agreement with the full-set FAO-56 PM. This program is the first software facilitating calculation of ET₀ only with air temperature parameter.     

基于基态修正时空模型的行政区划图更新方法研究

随着地理信息系统在我国日常生活中的广泛应用,数据不易获取的问题越发突出,特别是行政区划图这种变更频繁、标准制图周期长的数据。根据我国行政编码的规范和行政区划变更特点,在基态修正模型的基础上采用面向对象的方式组织空间数据,通过对行政区划变更事件的记录,生成新的行政区划图,并在此基础上实现空间数据的管理和回溯查询,解决了空间数据需求的现势性问题。     

Remote sensing of soil surface characteristics from a multiscale classification approach

Due to their significant influence on infiltration/runoff partitioning and soil erosion, hydrological soil surface characteristics (SSC) have to be known in a spatially distributed manner. This paper proposes a new approach based on radiometric and spatial remotely sensed information, for the mapping of hydrological SSC classes according to a predefined typology based on infiltration rates. Traditional remote sensing approaches usually focus on single SSC attributes only, where the latter correspond to key structural properties such as micro topography, surface crusting and soil cover. The originality of the method proposed here is considering the composite nature of SSC classes, by combining the aforementioned single attributes. This method makes use of a multiscale image segmentation that allows extracting image objects at two spatial scales of interest. At the fine scale, each Homogeneous Unit (HU) is assigned to an SSC attribute. At the coarse scale, SSC classes are identified by combining HU of SSC attributes assigned at the fine scale. The method was applied on airborne images collected over a Mediterranean vineyard by a small Pixy drone, and validated using intensive ground-based observations. The results showed acceptable performances with an overall accuracy ranging from 63 to 84%, depending on SSC classes and surface conditions. However, unsystematic confusions still remained between SSC classes which significantly differ in terms of hydrological behaviours. Improvements are expected considering richer spectral information, and ancillary information about SSC evolution in the case of intensive temporal monitoring.     

面向对象的数据库应用研究

基于面向对象技术的基本思想和开发过程,介绍了数据库的发展,比较了关系型数据库和面向对象数据库,说明了面向对象数据库产生的必然性、特征和核心技术。结合具体实例对面向对象技术在数据库系统结构设计和详细设计中的应用进行了详细探讨,利用Versant公司的面向对象数据库系统FastObjects,展示了面向对象数据库的基本操作。     

资环环境类专业面向对象程序设计课程教学方法探讨

一般资环环境与城乡规划管理、地理信息系统等专业学生的计算机语言基础较弱,由于面向对象程序设计课程涉及概念比较抽象、知识难点较多,学生在学习时常感到难以全面掌握面向对象程序设计语言的核心知识。该文分析了常规教学方法的不足,提出基于程序结构演化的面象对象程序设计教学方法,从程序的基本结构演化讲起,绕过对基本概念的理解,从结构的演化角度回归到概念,降低了学生对抽象概念的理解难度,在实际教学中取得了较好的效果。