基于密度权期望最大与分裂合并策略的线状模式挖掘

该文针对非线性数据集中线状模式的挖掘问题,提出一种基于密度权期望最大(EM)与分裂合并策略的回归算法。算法基于有限混合模型思想,使用点向式方程定义线状模式表示,将网格密度作为调节权值引入EM过程,有效降低了回归落入局部极值的可能性。同时,引入分裂合并策略,使得算法能够解决连通性问题,并且即使在挖掘数设置与本质线状模式数不相符时也能获得正确结果。实验结果表明,算法对挖掘数设置不敏感,能够正确挖掘出噪声环境下数据集的线状模式。

线状法律控制模式与网状法律控制模式——我国新时期法治建设的误区与必然走向

我国新时期的法治理论与实践 ,虽大力弘扬依法办事的理想法治状态 ,但法律控制模式却是一种纵向的线状控制模式 ,其实效要以人性善作为最终保障 ,仍是一种人治模式。西方的法律控制模式是一种纵横交错的网状控制模式 ,其实效以人性恶作为动力和支撑。网状控制模式是西方法治的经验结晶 ,是法治的生命形式 ,是市场经济的必然要求 ,因而也是我国法治的必然走向。

关于农村居民点布局模式的思考——以长株潭绿心地区为例

农村居民点是农村村民生产和生活的场所,也是农村土地利用的重要组成部分。长期以来,我国农村居民点缺乏整体上的布局与调控。长株潭绿心地区由于其特殊的自然地形条件,土地资源有限,存在农村居民点数量多,规模小,分布零散等诸多问题,文章最后根据绿心地区实际情况,建议采用新村建设型、岛状居民点、线状居民点三大布局模式。

校友资源在高校学生工作中的开发运用——以在新闻传播学科开展公共关系教学为例

高校校友资源是学校的宝贵资源,它在促进大学建设、发展与改革中发挥着重要的作用。传统的分离线状模式对校友资源的利用是单一的,成效是分离的,难以为高校的整体发展作出更大的贡献。双生共圆模式发挥了整合效应,彰显了价值,顺应了新时代学生工作的发展趋势。

语文教学思路结构类型刍议

数学思路,即按一定的程序方式安排教学内容。教学思路结构就是对具体教学思路的再抽象,从而构成最基本的教学思路模式。显然,若能从较高层次上把握住语文教学思路的几种基本模式,必有助于选择具体的教学思路。一、线状模式它是指根据教学目的,在单位时间里(通常指一节课)

景观生态林建设适宜网络连接度技术研究

从区域景观生态林建设在区域社会经济发展的重要地位出发,在应用遥感技术和全球定位系统技术获取区域土地资源数据的基础上,以景观生态学理论为指导,深入研究林业用地的景观多样性、景观异质性和立地生境的复杂性,调整和确定适宜的网络连接度,构建区域景观生态林业建设线状地物绿化技术模式。

Nonlinear finite-element-based structural system failure probability analysis methodology for gravity dams considering correlated failure modes

The structural system failure probability(SFP) is a valuable tool for evaluating the global safety level of concrete gravity dams.Traditional methods for estimating the failure probabilities are based on defined mathematical descriptions,namely,limit state functions of failure modes.Several problems are to be solved in the use of traditional methods for gravity dams.One is how to define the limit state function really reflecting the mechanical mechanism of the failure mode;another is how to understand the relationship among failure modes and enable the probability of the whole structure to be determined.Performing SFP analysis for a gravity dam system is a challenging task.This work proposes a novel nonlinear finite-element-based SFP analysis method for gravity dams.Firstly,reasonable nonlinear constitutive modes for dam concrete,concrete/rock interface and rock foundation are respectively introduced according to corresponding mechanical mechanisms.Meanwhile the response surface(RS) method is used to model limit state functions of main failure modes through the Monte Carlo(MC) simulation results of the dam-interface-foundation interaction finite element(FE) analysis.Secondly,a numerical SFP method is studied to compute the probabilities of several failure modes efficiently by simple matrix integration operations.Then,the nonlinear FE-based SFP analysis methodology for gravity dams considering correlated failure modes with the additional sensitivity analysis is proposed.Finally,a comprehensive computational platform for interfacing the proposed method with the open source FE code Code Aster is developed via a freely available MATLAB software tool(FERUM).This methodology is demonstrated by a case study of an existing gravity dam analysis,in which the dominant failure modes are identified,and the corresponding performance functions are established.Then,the dam failure probability of the structural system is obtained by the proposed method considering the correlation relationship of main failure modes on the basis of the mechanical mechanism analysis with the MC-FE simulations.