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排序方式: 共有64条查询结果,搜索用时 15 毫秒
1.
Due to destructiveness of natural disasters, restriction of disaster scenarios and some human causes, missing data usually occur in disaster decision-making problems. In order to estimate missing values of alternatives, this paper focuses on imputing heterogeneous attribute values of disaster based on an improved K nearest neighbor imputation (KNNI) method. Firstly, some definitions of trapezoidal fuzzy numbers (TFNs) are introduced and three types of attributes (i.e. linguistic term sets, intervals and real numbers) are converted to TFNs. Then the correlated degree model is utilized to extract related attributes to form instances that will be used in K nearest neighbor algorithm, and a novel KNNI method merging with correlated degree model is presented. Finally, an illustrative example is given to verify the proposed method and to demonstrate its feasibility and effectiveness. 相似文献
2.
居民参与社区建设和营造是解决我国当代居住社区邻里交往缺失的途径之一。本文探讨了居民参与社区建设应始于何处,建筑师应如何通过设计手段引导和启发居民进行参与活动,在参与的同时促使居住区社会网络的形成与成熟,达到改善居住区人际关系的最终目的。 相似文献
3.
Jean‐François Coeurjolly Jesper Møller Rasmus Waagepetersen 《Scandinavian Journal of Statistics》2017,44(1):192-203
This paper establishes a remarkable result regarding Palm distributions for a log Gaussian Cox process: the reduced Palm distribution for a log Gaussian Cox process is itself a log Gaussian Cox process that only differs from the original log Gaussian Cox process in the intensity function. This new result is used to study functional summaries for log Gaussian Cox processes. 相似文献
4.
Optimality of experimental designs for spatially correlated observations is investigated.come two dimensional correlation structures are discussed and an attempt has been made to find optimal or nearly optimal design for each sitution.The solution lend to designs similar to that used for repeated measurements.The relative efficiency of the proposed designs in comparison to randomized latin square designs is tabulated for some cases. 相似文献
5.
DDS的背景杂散信号分析 总被引:4,自引:0,他引:4
采用信号分析的方法,在对相位累加器进行等效的基础上系统地推导出了幅度量化误差(ROM舍位)对直接数字频率合成器(DDS)频谱分布的影响规律。所得到的理论推导结果与有关文献给出的计算机模拟结果符合较好,进一步完善了DDS的理论体系。 相似文献
6.
In the context of the partially linear semiparametric model examined by Robinson (1988), we show that root-n-consisten estimation results established using kernel and series methods can also be obtained by using k-nearest-neighbor (k-nn) method. 相似文献
7.
李新萌 《成都理工大学学报(社会科学版)》2015,(1):56-59
应用纳什均衡理论,并通过创建假设模型,分析两大连锁餐饮巨头麦当劳与肯德基比邻而居的现象,可揭示出连锁超市、连锁企业等聚合选址、聚合经营的原理:聚合选址、聚合经营同类型或者相近产品可以在有效地刺激消费者需求,加速商品流通与周转速度的同时,极大降低商家的经营风险与成本。同时,企业若想在聚合经营中求得生存和发展,还须努力打造出自身特色,塑造拥有竞争力的完美个性。 相似文献
8.
In this paper, we provide some exponential inequalities for extended negatively dependent (END) random variables. By using these exponential inequalities and the truncated method, we investigate the complete consistency for the estimator of nonparametric regression model based on END errors. As an application, the complete consistency for the nearest neighbour estimator is obtained. 相似文献
9.
Wu Qiqi 《佛山科学技术学院学报(社会科学版)》1989,(4)
本文得到p(n,3)的两个新公式,若仅从计算的角度上来看,比原有公式快捷一些.另外,从本文的公式出发,可大大简化推导P(n,4)的工作. 相似文献
10.
Abstract. In this paper, we consider a semiparametric time-varying coefficients regression model where the influences of some covariates vary non-parametrically with time while the effects of the remaining covariates follow certain parametric functions of time. The weighted least squares type estimators for the unknown parameters of the parametric coefficient functions as well as the estimators for the non-parametric coefficient functions are developed. We show that the kernel smoothing that avoids modelling of the sampling times is asymptotically more efficient than a single nearest neighbour smoothing that depends on the estimation of the sampling model. The asymptotic optimal bandwidth is also derived. A hypothesis testing procedure is proposed to test whether some covariate effects follow certain parametric forms. Simulation studies are conducted to compare the finite sample performances of the kernel neighbourhood smoothing and the single nearest neighbour smoothing and to check the empirical sizes and powers of the proposed testing procedures. An application to a data set from an AIDS clinical trial study is provided for illustration. 相似文献