知识发现在赤潮预测预警系统研究中的应用   总被引：2，自引：2，他引：2  

沈菲  王洪礼  冯剑丰  孙景 《海洋技术学报》2003,22(2):19-22

目前大多数赤潮的预测研究工作着重在系统模型的准确性上，忽视模型所能提供的对生态系统行为的相互关系的解释的很多信息。而机器学习所获得的知识能够帮助对生态行为之间的因果关系更深入的认识。文章将知识发现技术应用于海洋检测数据之中，取得了较好的效果，这将对于赤潮预测预警系统的研究与建立起着关键的作用。  相似文献   

移动机器人道路图像的快速分割方法     

李庆忠  顾伟康 《中国海洋大学学报(自然科学版)》2003,33(5):764-770

本文针对影响道路场景分割效果的 2个最主要因素 :阴影和水迹 ,提出了用 3个有效彩色特征量来描述道路、阴影和水迹的特征 ,并提出了特征图像的快速提取方法 ,实现了道路图像一维直方图的全局快速分割。实验结果表明 :本文提出的分割方法可以有效地消除阴影或水迹对道路图像分割效果的影响 ,且满足一般道路场景下移动机器人实时导航的要求。  相似文献   

JD15型全液压钻机给进机构的方案设计          下载免费PDF全文

于彦江  李波  吴来杰  蔡建平 《探矿工程》2007,34(8):37-39

钻机给进机构性能的好坏直接影响钻探效率、钻孔质量的高低和钻机其他技术性能的发挥。通过对JD15型全液压钻机给进机构的几种设计方案的分析对比,最终确定出满足设计要求的最佳方案,即长行程单液压缸给进机构方案,并完成了核心部件的设计与校核。  相似文献   

基于最小二乘支持向量机的砂土液化预测方法          下载免费PDF全文

李志雄 《地震工程学报》2007,29(2):133-136,155

使用最小二乘支持向量机分类方法建立了两个砂土液化预测模型,预测结果与野外实际情况全部相符,表明该分类方法用于预测砂土液化是可行的,且预测准确率高。  相似文献   

基于机器视觉的线阵CCD相机成像几何模型   总被引：1，自引：0，他引：1  

刘松林  哈长亮  郝向阳  西勤 《测绘科学技术学报》2006,23(5):387-390

以研究机器视觉技术在运动的流线体类型的工业品在线质量检测领域的应用为基础,重点地研究线阵CCD相机结构、成像原理、成像方式及外部条件,分析了CCD相机成像误差来源及相关解决方法,探讨了线阵CCD相机在质量检测领域的成像模型的具体应用模式,并结合具体的实例内容进行了验证,证明了线阵CCD相机的成像几何模型在这一领域的应用性和适用性,为线阵CCD相机在机器视觉系统中大规模的应用提供了可靠的借鉴意义.  相似文献   

Support vector machine method for forecasting future strong earthquakes in Chinese mainland     

王炜 刘悦李国正  吴耿锋马钦忠赵利飞  林命週 《地震学报(英文版)》2006,19(1):30-38

Statistical learning theory is for small-sample statistics. And support vector machine is a new machine learning method based on the statistical learning theory. The support vector machine not only has solved certain problems in many learning methods, such as small sample, over fitting, high dimension and local minimum, but also has a higher generalization （forecasting） ability than that of artificial neural networks. The strong earthquakes in Chinese mainland are related to a certain extent to the intensive seismicity along the main plate boundaries in the world, however, the relation is nonlinear. In the paper, we have studied this unclear relation by the support vector machine method for the purpose of forecasting strong earthquakes in Chinese mainland.  相似文献   

基于UML中药资源地理信息系统的设计   总被引：1，自引：0，他引：1  

金君  李鲁群  邓敏 《测绘工程》2003,12(1):41-43

中药是中国传统医药的重要组成部分。确切、完整的中药资源既具有其本身的属性描述，又具有地理空间分布属性。为此，根据中药材资源管理部门要求，结合最新的系统建模与软件技术，开发出了中药资源地理信息系统（CTM－GIS），有效地集成和管理了中药资源的地理空间信息和属性信息，着重论述采用统一建模语言（UML）进行CTM－GIS的总体设计。  相似文献   

食堂售饭系统窗口机设计     

邹继军  饶运涛 《华东地质学院学报》2004,27(3):293-297

叙述了传统食堂售饭系统的不足，介绍了CAN总线与非接触式IC卡技术的特点和优势，并对以这两种技术为基础的新型食堂售饭系统窗口机的软硬件设计原理进行了较详细的分析。窗口机硬件系统主要由CAN总线通信接口、IC卡读写器、键盘、显示和存储器等功能模块组成，软件系统主要由窗口机初始化模块、窗口机监控模块、窗口机按键处理模块等组成。论文在对窗口机原理进行分析的同时，也对设计中遇到的关键问题进行了讨论，对于今后食堂售饭系统的设计提供了一个新的思路。  相似文献   

Expert System for Applicability of Tunnel Boring Machines in Japan   总被引：6，自引：0，他引：6  

S. Okubo  K. Fukui  W. Chen 《Rock Mechanics and Rock Engineering》2003,36(4):305-322

Summary ¶This paper outlines the development of a new expert system for assessing the applicability of tunnel boring machine (TBM) tunneling in Japan. Although a great deal of research on TBMs has been published, and the applicability of TBMs has been discussed, considerable differences in opinion still exist between authors. In this paper, we review previous studies and outline the present situation with particular focus on disc-cutter TBMs. Based on the knowledge acquired, we present an expert system for the applicability of TBMs, for use in pre-feasibility studies. Originally, we planned to construct the expert system on the basis of unified knowledge or rules without contradictions. However, it was found after several attempts that it is very difficult to unify knowledge because opinions vary considerably and TBMs are under continuous development. As a result, the expert system was divided into three stages. In stage A, the fulfillment of fundamental requirements is checked. Stage B is a simple expert system consisting of a minimal set of suitable rules as judged by the authors. Stage C incorporates the opinions of various other experts and the over-simplified and omitted points in stage B. The system is applied to 18 tunnels in Japan, and while the results provided by the expert system can certainly be improved, the method for accumulating knowledge and rules makes the system simple and easy to use, with very large scope for improvement and expansion.Received July 1, 2001; accepted December 9, 2002 Published online April 29, 2003  相似文献   

In-situ Measurements of Cutter Forces on Boring Machine at Äspö Hard Rock Laboratory Part I. Laboratory Calibration and In-situ Measurements     

Z. X. Zhang  S. Q. Kou  X. C. Tan  P.-A. Lindqvist 《Rock Mechanics and Rock Engineering》2003,36(1):39-61

Summary This paper presents the testing methods used and the results obtained in an investigation of the cutter forces on a Boretec DS 1.6 boring machine during field boring in ?sp? Hard Rock Laboratory. Two button cutters, one front cutter and one gauge cutter, were used in the field measurements. A total of 6 strain gauges were bonded on the shaft of each cutter. And each group of two gauges was used to measure a one-orthogonal cutter force component, i.e. the normal force, tangential force, and side force, respectively. In order to measure the cutter forces successfully, a telemetry system composed of a transmitter and a receiver was employed to transfer the signals from the strain gauges to a computer.  A three-direction-loading system was employed in the laboratory calibration so as to solve the force-coupling problem appearing in the cutter force measurements. Correspondingly, a mathematical treatment of the force-coupling problem was performed. Then, by means of the established testing system, which was proved successful in the laboratory, the normal force, tangential force, and side force of the two button cutters on the boring machine were measured in the field. In addition, the penetration rate, thrust, and rotation speed of the boring machine were also recorded in the field. The results show the following. (1) A force-coupling phenomenon really exists and it should be considered. (2) All three directional force components always show quite a high peak value every few seconds. (3) The cutter forces of the front cutter are always much larger than the respective cutter forces of the gauge cutter. Moreover, as expected, the normal force of each cutter is much larger than the tangential force and side force of the cutter in question. Received October 5, 2001; accepted June 25, 2002; Published online November 19, 2002  相似文献