支持向量机在短期气候预测中的应用   总被引：9，自引：1，他引：9  

李智才  马文瑞  李素敏  张瑞兰  张红雨 《气象》2006,32(5):57-61

支持向量机（SVM，Support Vector Machines）是基于统计学习理论框架下的一种新的通用机器学习方法。可以解决样本空间中的高度非线性分类和回归等问题，是一种处理非线性分类和非线性回归的有效方法。气候变化诸多因子的复杂性和非线性决定了预报因子与预报对象问的非线性关系，SVM为解决短期气候预测提供了一种可行的有效途径。利用Nino区海温、南方涛动指数、副高面积指数、亚洲区极涡面积指数等15个预报因子，建立了阳泉夏季降水正、负距平的SVM非线性分类模型，同时也建立了阳泉夏季降水的SVM回归模型，并进行了相应的预报试验，结果显示，对应的SVM分类模型和回归模型均具有良好的预报能力。  相似文献   

Integrating GIS and DSS for identification of suitable areas for artificial recharge,case study Meimeh Basin,Isfahan, Iran   总被引：12，自引：0，他引：12  

Jafar?GhayoumianEmail author  B.?Ghermezcheshme  S.?Feiznia  A.?A.?Noroozi 《Environmental Geology》2005,47(4):493-500

Flood spreading is an inexpensive method for flood mitigation and artificial recharge of aquifers that results in a large budget return for relatively small investment.It is necessary to study some regional characteristics in order to determine the appropriate areas for artificial groundwater recharge by flood spreading in Meimeh Basin, Isfahan Province, Iran. Necessary regional characteristics to be studied are: slope, infiltration rate, sediment thickness, transmissivity, and water quality. In this research to identify suitable areas for artificial recharge several thematic layers were prepared, assigning each layer to one of the mentioned characteristics. The thematic layers were classified to several classes based on the existing criteria. All of the classes of the thematic layers were integrated and analyzed using a decision support system (DSS) in a geographical information system (GIS) environment. Finally suitability of the integrated classes for artificial recharge was identified in which the following classes were separated:(i) Very suitable, (ii) suitable, (iii) moderate suitability, and (iv) unsuitable.The validity of the generated model was verified by applying the model to a number of successful floodwater spreading stations throughout Iran. The verified model showed satisfactory results for all of the stations. The results for Meimeh Basin showed that about 70% of the Quaternary sediments in the studied area are suitable and moderately suitable for artificial recharge by flood spreading.  相似文献   

Grouting and support techniques used in the Karstic limestones of the Jura mountains for the LEP underground laboratory     

C. Laughton 《Geotechnical and Geological Engineering》1988,6(4):353-365

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内外支座为固支的钢筋砼环板的极限分析与设计     

刘贤明  鄢玉英 《华东地质学院学报》2004,27(4):389-391

利用极限平衡条件，对内外支座为固支的环板进行了塑性极限分析，假定环板破坏时的塑性铰线为径环向．塑性铰线分割的各个板块为绝对刚体，每个板块满足各自的平衡条件，由板块的极限平衡方程，得出了环板极限状态时的内力计算公式，并通过试算得出了环板在不同的内外半径之比时，公式中的塑性铰线位置系数a1，a2的取值，使内外支座为固支的环板的计算问题大为简化。设计方法简单可行，便于在工程中应用。  相似文献   

Spatial decision support system for home-delivered services     

Wilpen Gorr  Michael Johnson  Stephen Roehrig 《Journal of Geographical Systems》2001,3(2):181-197

 We present a spatial decision support system for the non-profit sector, designed to assist planning in the area of home-delivered services such as meals on wheels. Using data collected from existing programs, current and forecasted demographic data, and a set of algorithmic tools, we provide a system for evaluating current meals on wheels facilities, and for making incremental facility location decisions that satisfy coverage and equity requirements. Received: 27 September 2000 / Accepted: 22 March 2001  相似文献   

中小流域防洪规划决策支持系统──Ⅰ系统研究   总被引：7，自引：1，他引：7       下载免费PDF全文

郭建中  胡和平  翁文斌 《水科学进展》2001,12(2):222-226

根据我国中小河流的基本特征,首先说明了我国中小流域防洪规划的目的、意义,然后阐述了我国中小流域防洪规划的主要内容和基本步骤,最后详细介绍了我国中小流域防洪规划决策支持系统的建立和使用.决策支持系统作为一种新型的研究方法与手段,它在防洪规划中的应用必将加强我国中小流域防洪规划的研究,简化防洪规划的过程,使得我国中小流域的防洪规划更加科学、准确.  相似文献   

中小流域防洪规划决策支持系统──Ⅱ个例分析   总被引：4，自引：1，他引：4       下载免费PDF全文

胡和平  郭建中  翁文斌 《水科学进展》2001,12(2):227-231

以洪汝河流域为研究对象,详细介绍了中小流域防洪规划决策支持系统的建立及使用,并对相关结果作了分析,个例证明把决策支持系统方法引入防洪规划问题中是有现实意义的,它不仅可以提高防洪规划的速度,同时可以提高防洪规划的准确性,是一种可行的尝试.  相似文献   

空间决策支持系统中模型库的生成及与GIS的紧密集成—以厦门市环境管理空间决策支持系统为例   总被引：17，自引：0，他引：17  

陈崇成  王钦敏  汪小钦  黄绚 《遥感学报》2002,6(3):168-172

以厦门市环境管理空间决策支持系统为例，首先构造了以地理信息系统为中心的环境空间决策支持系统体系结构新类型，进而在分析现有的模型库生成、组织的不足基础上，提出了从数学模型群组→模型体系→模型库的建模和模型库组织新方法。介绍了集成系统开发中模型库与GIS紧密集成方案，并完成运行系统在厦门市大气污染物扩散模拟与总量控制中的应用。  相似文献   

Critical damping of structures with elastically supported visco‐elastic dampers     

Yujin Lee  Izuru Takewaki  Koji Uetani  Kazuo Inoue 《地震工程与结构动力学》2002,31(2):481-486

This paper presents a new formulation for critical damping of structures with elastically supported visco‐elastic dampers.Owing to the great dependence of damper performance on the support stiffness, this model is inevitable for reliable modelling of structures with visco‐elastic dampers. It is shown that the governing equation of free vibration of this model is reduced to a third‐order differential equation and the conventional method for defining the critical damping for second‐order differential equations cannot be applied to the present model. It is demonstrated that the region of overdamped vibration is finite in contrast to that (semi‐infinite) for second‐order differential equations and multiple critical damping coefficients exist. However, it turns out that the smaller one is practically meaningful. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

新型土钉墙技术在基坑支护工程中的应用   总被引：5，自引：0，他引：5  

张建 《江苏地质》2002,26(4):221-224

新型土钉墙是在传统土钉墙的基础上和工程实践中发展起来的，其具体表现形式为止水型土钉墙，加强型土钉墙及打入钢管注浆型土钉墙。实践证明，这种新型的土钉墙可满足不同实际工程的需要，显示出了它强大的生命力。  相似文献