期刊文献+
共找到14篇文章
< 1 >
每页显示 20 50 100
二部模型法预测贫困农村居民的村级门诊医疗费 被引量:4
1
作者 陈文贤 高谨 +1 位作者 毛正中 龚志平 《中国卫生资源》 2000年第3期134-136,共3页
为了解贫困农村居民的医疗需求情况,建立适合贫困农村实际的合作医疗制度,该研究结合1997年5月在四川古蔺县的调查资料,采用二部模型法对村级门诊医疗费用进行了测算,结果显示年人均村级门诊医疗费用达到15~17元,占年人... 为了解贫困农村居民的医疗需求情况,建立适合贫困农村实际的合作医疗制度,该研究结合1997年5月在四川古蔺县的调查资料,采用二部模型法对村级门诊医疗费用进行了测算,结果显示年人均村级门诊医疗费用达到15~17元,占年人均医疗费的45%~50%;提示开展合作医疗试点必须加强对村级医疗机构的管理,促进农村三级医疗网络的合理利用。 展开更多
关键词 二部模型 贫困地区 农村居民 医疗费用 合作医疗 村级医疗机构
下载PDF
基于二部配置模型的网络用户分组及重要回复者识别
2
作者 张亚茹 唐锡晋 《系统工程学报》 CSCD 北大核心 2021年第5期577-589,708,共14页
在以社交媒体为载体的舆论场中,用户的个人诉求和回复行为潜在地反映其兴趣偏好,根据这一关联为用户分组,从而推动群体新闻推荐系统的发展.识别用户的重要回复者以由消息传播机制干预正负面新闻的传播.以天涯论坛为例,定义顶级用户与普... 在以社交媒体为载体的舆论场中,用户的个人诉求和回复行为潜在地反映其兴趣偏好,根据这一关联为用户分组,从而推动群体新闻推荐系统的发展.识别用户的重要回复者以由消息传播机制干预正负面新闻的传播.以天涯论坛为例,定义顶级用户与普通用户,结合二部配置模型建模顶级用户、帖子和普通用户间基于发帖关系以及回复关系的二部图,获取了具有不同话题偏好的用户群,每组内的用户交互密切.得到的重要回复者回复偏重性明显,且易将相应顶级用户的负面情绪放大,因此识别重要回复者并适时施以制约为网络舆情管理提供新视角. 展开更多
关键词 用户分组 重要回复者 配置模型
下载PDF
中老年人因超重和肥胖导致的自付医疗费用研究 被引量:8
3
作者 闫晓芳 史静琤 +1 位作者 程文炜 刘晓芳 《中国卫生统计》 CSCD 北大核心 2019年第1期22-27,共6页
目的超重和肥胖为居民带来了巨大的经济负担,自付医疗费用是居民经济负担的重要组成部分,本文旨在探讨中老年人因超重和肥胖所导致的自付医疗费用。方法采用2013年"中国健康与养老追踪调查(China health and retirement longitudin... 目的超重和肥胖为居民带来了巨大的经济负担,自付医疗费用是居民经济负担的重要组成部分,本文旨在探讨中老年人因超重和肥胖所导致的自付医疗费用。方法采用2013年"中国健康与养老追踪调查(China health and retirement longitudinal study,CHARLS)"数据库的数据,调查45岁及以上10908位居民的人口学特点,并通过二部模型探讨总人群BMI分层与自付医疗费用的关系及基本医保对于超重和肥胖人群自付医疗费用的影响。采用计量经济学的方法计算超重和肥胖自付医疗费用的归因比例。结果 2013年我国中老年人超重率和肥胖率分别为31.51%和12.98%。超重者和肥胖者的自付费用(2613.60元/年和2768.49元/年)高于正常体重者(1804.45元/年)。二部模型的结果表明,超重者和肥胖者分别比正常体重者多21.35%和49.43%的可能产生自付医疗费用;已产生的自付医疗费用中,超重者和肥胖者分别比正常体重者高10.34%和13.37%。2013年,中老年人归因于超重和肥胖自付医疗费用的比例分别为6.13%和5.18%。结论政府应采取有效措施降低超重和肥胖率,建议进一步改进医保制度,减轻中老年人超重和肥胖人群的经济负担。 展开更多
关键词 超重 肥胖 自付费用 二部模型
下载PDF
基于决策加权的聚类集成算法 被引量:4
4
作者 黄栋 王昌栋 +3 位作者 赖剑煌 梁云 边山 陈羽 《智能系统学报》 CSCD 北大核心 2016年第3期418-425,共8页
聚类集成的目标是融合多个聚类成员的信息以得到一个更优、更鲁棒的聚类结果。针对聚类成员可靠度估计与加权问题,提出了一个基于二部图模型与决策加权机制的聚类集成方法。在该方法中,每个聚类成员被视作一个包含若干连接决策的集合。... 聚类集成的目标是融合多个聚类成员的信息以得到一个更优、更鲁棒的聚类结果。针对聚类成员可靠度估计与加权问题,提出了一个基于二部图模型与决策加权机制的聚类集成方法。在该方法中,每个聚类成员被视作一个包含若干连接决策的集合。每个聚类成员的决策集合享有一个单位的可信度,该可信度由集合内的各个决策共同分享。基于可信度分享的思想,进一步对各个聚类成员内的决策进行加权,并将此决策加权机制整合至一个统一的二部图模型;然后利用快速二部图分割算法将该图划分为若干子集,以得到最终聚类结果。实验结果表明,该方法相较于其他对比方法在聚类效果及运算效率上均表现出显著优势。 展开更多
关键词 聚类 聚类集成 决策加权 模型 图分割 基聚类 可信度分享 加权集成
下载PDF
基于仿真数据的指挥控制网络复杂特性分析 被引量:6
5
作者 刘洋 胡晓峰 +1 位作者 淦文燕 吴琳 《指挥信息系统与技术》 2013年第4期11-16,共6页
以大规模联合作战演习为背景,基于演习产生的仿真数据,采用复杂网络方法构建了指挥控制的二部图网络模型,分析了其结构特性及演化行为。实证研究表明,实际演习中,指挥控制网络从初始的强结构特征演化出无标度特性,其形成机制不仅... 以大规模联合作战演习为背景,基于演习产生的仿真数据,采用复杂网络方法构建了指挥控制的二部图网络模型,分析了其结构特性及演化行为。实证研究表明,实际演习中,指挥控制网络从初始的强结构特征演化出无标度特性,其形成机制不仅依赖于各种节点加入网络的时间,而且与指挥员的指挥行为密切相关。 展开更多
关键词 指挥控制 复杂网络 图网络模型 累积度分布
下载PDF
应对倾斜数据流在线连接方法 被引量:2
6
作者 王春凯 孟小峰 《软件学报》 EI CSCD 北大核心 2018年第3期869-882,共14页
并行环境下的分布式连接处理要求制定划分策略以减少状态迁移和通信开销.相对于数据库管理系统而言,分布式数据流管理系统中的在线θ连接操作需要更高的计算成本和内存资源.基于完全二部图的连接模型可支持分布式数据流的连接操作.因为... 并行环境下的分布式连接处理要求制定划分策略以减少状态迁移和通信开销.相对于数据库管理系统而言,分布式数据流管理系统中的在线θ连接操作需要更高的计算成本和内存资源.基于完全二部图的连接模型可支持分布式数据流的连接操作.因为连接操作的每个关系仅存放于二部图模型的一侧处理单元,无需复制数据,且处理单元相互独立,因此该模型具有内存高效、易伸缩和可扩展等特性.然而,由于数据流速的不稳定性和属性值分布的不均衡性,导致倾斜数据流的连接操作易出现集群负载不均衡的现象.针对倾斜数据流的连接操作,模型无法动态分配查询节点,并需要人工干预数据分组的参数设置.尤其是应对全部历史数据的连接查询,模型效率更低.基于上述问题,提出了管理倾斜数据流连接的框架,使用基于键值和元组混合的划分样式,有效应对二部图模型的各侧倾斜数据.设计了重新动态分配查询节点的策略和状态迁移算法,以支持全历史数据的连接查询和自适应的资源管理.针对合成数据和真实数据的实验结果表明,该方案可有效应对倾斜数据的连接操作,并进一步提升分布式数据流管理系统的吞吐率,特别是降低云环境中的计算成本. 展开更多
关键词 分布式数据流管理系统 在线连接 数据倾斜 状态迁移 图连接模型
下载PDF
一种基于二部图谱划分的聚类集成方法
7
作者 徐森 皋军 +3 位作者 徐秀芳 花小朋 徐静 安晶 《控制与决策》 EI CSCD 北大核心 2018年第12期2208-2212,共5页
将二部图模型引入聚类集成问题中,使用二部图模型同时建模对象集和超边集,充分挖掘潜藏在对象之间的相似度信息和超边提供的属性信息.设计正则化谱聚类算法解决二部图划分问题,在低维嵌入空间运行Kmeans++算法划分对象集,获得最终的聚... 将二部图模型引入聚类集成问题中,使用二部图模型同时建模对象集和超边集,充分挖掘潜藏在对象之间的相似度信息和超边提供的属性信息.设计正则化谱聚类算法解决二部图划分问题,在低维嵌入空间运行Kmeans++算法划分对象集,获得最终的聚类结果.在多组基准数据集上进行实验,实验结果表明所提出方法不仅能获得优越的结果,而且具有较高的运行效率. 展开更多
关键词 机器学习 聚类分析 模型 聚类集成 谱聚类算法
原文传递
Local Partial Least Squares Based Online Soft Sensing Method for Multi-output Processes with Adaptive Process States Division 被引量:3
8
作者 邵伟明 田学民 王平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第7期828-836,共9页
Local learning based soft sensing methods succeed in coping with time-varying characteristics of processes as well as nonlinearities in industrial plants. In this paper, a local partial least squares based soft sensin... Local learning based soft sensing methods succeed in coping with time-varying characteristics of processes as well as nonlinearities in industrial plants. In this paper, a local partial least squares based soft sensing method for multi-output processes is proposed to accomplish process states division and local model adaptation,which are two key steps in development of local learning based soft sensors. An adaptive way of partitioning process states without redundancy is proposed based on F-test, where unique local time regions are extracted.Subsequently, a novel anti-over-fitting criterion is proposed for online local model adaptation which simultaneously considers the relationship between process variables and the information in labeled and unlabeled samples. Case study is carried out on two chemical processes and simulation results illustrate the superiorities of the proposed method from several aspects. 展开更多
关键词 Local learning Online soft sensing Partial least squares F-TEST Multi-output process Process state division
下载PDF
Research on the Decision Model to Stakeholders in PPP Projects
9
作者 ZHANG Wei 《International English Education Research》 2016年第4期90-92,共3页
Aiming at the public sector and the private sector in PPP projects as the research objects, the two core participants investment decision model is established by using option game thinking. First, based on the option ... Aiming at the public sector and the private sector in PPP projects as the research objects, the two core participants investment decision model is established by using option game thinking. First, based on the option game features PPP projects have, the paper proposes some research hypotheses on value, income, cost for the option. Second, on the basis of the decision path of a multi-stage binary tree model, respectively for the public sector and the private sector, the paper builds up utility functions, the cost-input model and the contract decision model. It indicates that by the use of growth options in the shortened contract period, the private sector can still ensure the construction quality of the PPP project. Finally, the validity of the model in the PPP project agreement and the investment decision process is verified by the case analysis. 展开更多
关键词 PPP projects STAKEHOLDERS MULTI-STAGE Option game
下载PDF
Development of Three Risk Assessment Models for Deoxynivalenol and Fumonisins B1 + B2 Contents in Maize Kernel
10
作者 C. Levasseur O. Surel D. Kleiber 《Journal of Agricultural Science and Technology(B)》 2011年第4期483-494,共12页
The maximal deoxynivalenol (DON) and fumonisins 131 + B2 (FUM) contents in cereals are dictated by the European regulation 1126/2007. The direct measurement of these mycotoxins is a tedious and expensive process.... The maximal deoxynivalenol (DON) and fumonisins 131 + B2 (FUM) contents in cereals are dictated by the European regulation 1126/2007. The direct measurement of these mycotoxins is a tedious and expensive process. Our study is based on an alternative tool: near infrared spectroscopy. Different models were developed on 374 maize samples to predict their DON and FUM contents. Several parameters have been determined and used in a multivariate data analysis. Three models were developed: (1) a classification model based on Discriminant Factor Analysis (DFA), (2) a linear model based on ANalysis of COVAriance (ANCOVA) and (3) a Partial Least Squares Discriminant Analysis model (PLS-DA). Firstly, the performances of the DFA model for assessing DON and FUM risk were similar: 69 and 72% of the validation samples were respectively well classified. In the second part, the performances of the ANCOVA model for DON were higher than for FUM. The r2 was worth respectively 0.85 and 0.69. In the last part, the performances of the PLS-DA models were better for FUM than for DON. These results show that an evaluation of the mycotoxin risk is possible by analyzing selected kernel parameters measurable by secondary analytical such as near-infrared spectroscopy. Further work is needed to improve the models, adding more samples and using non linear approaches. 展开更多
关键词 Maize kernel mycotoxins contents (deoxynivalenol and fumonisins) risk assessment near infrared spectroscopy.
下载PDF
Steering control strategy guide by two preview vision cues 被引量:7
11
作者 SHEN Huan LING Rui +1 位作者 MAO JianGuo LI ShunMing 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第9期2662-2670,共9页
Vision cues play an important role in states feedback in motion control.However,the existing driver steering models consider little about vision cues utilized by human drivers during their steering procedure.This pape... Vision cues play an important role in states feedback in motion control.However,the existing driver steering models consider little about vision cues utilized by human drivers during their steering procedure.This paper presents a novel steering control strategy based on two preview points(far point and near point).The far point is used to compensate the steering wheel by predicting the upcoming curvature change with respect to the lane,while the near point as vision feedback,which is used to tune the steering wheel by estimating the errors of vehicle states and lane center.To obtain much smoother lateral acceleration during steering,a forward internal model is established using a second-order yaw dynamics system that captures the influence of yaw angular acceleration caused by steering wheel angle.The input parameter of the second-order system is the vision cues of both the near and far points,and the output parameters are the ideal yaw angle and yaw rate.To calculate suitable the steering wheel angle,an adaptive controller is designed using fuzzy sliding technology,which is used as the input of the vehicle system dynamics.Numerical simulation results show that the proposed method performs better than the existing driver steering models in case of imitating human drivers' behavior,and exhibits excellent adaption to the lane curvature change. 展开更多
关键词 autonomous driving lateral control driver model fuzzy logic cognitive vehicle
原文传递
SIEVE LEAST SQUARES ESTIMATOR FOR PARTIAL LINEAR MODELS WITH CURRENT STATUS DATA
12
作者 Songlin WANG Sanguo ZHANG Hongqi XUE 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2011年第2期335-346,共12页
Current status data often arise in survival analysis and reliability studies, when a continuous response is reduced to an indicator of whether the response is greater or less than an observed random threshold value. T... Current status data often arise in survival analysis and reliability studies, when a continuous response is reduced to an indicator of whether the response is greater or less than an observed random threshold value. This article considers a partial linear model with current status data. A sieve least squares estimator is proposed to estimate both the regression parameters and the nonparametric function. This paper shows, under some mild condition, that the estimators are strong consistent. Moreover, the parameter estimators are normally distributed, while the nonparametric component achieves the optimal convergence rate. Simulation studies are carried out to investigate the performance of the proposed estimates. For illustration purposes, the method is applied to a real dataset from a study of the calcification of the hydrogel intraocular lenses, a complication of cataract treatment. 展开更多
关键词 Convergence rate current status data partial linear model sieve least squares estimator strong consistent.
原文传递
Weighted Profile Least Squares Estimation for a Panel Data Varying-Coefficient Partially Linear Model
13
作者 Bin ZHOU Jinhong YOU +1 位作者 Qinfeng XU Gemai CHEN 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2010年第2期247-272,共26页
This paper is concerned with inference of panel data varying-coefficient partially linear models with a one-way error structure. The model is a natural extension of the well-known panel data linear model (due to Balt... This paper is concerned with inference of panel data varying-coefficient partially linear models with a one-way error structure. The model is a natural extension of the well-known panel data linear model (due to Baltagi 1995) to the setting of semiparametric regressions. The authors propose a weighted profile least squares estimator (WPLSE) and a weighted local polynomial estimator (WLPE) for the parametric and nonparametric components, respectively. It is shown that the WPLSE is asymptotically more efficient than the usual profile least squares estimator (PLSE), and that the WLPE is also asymptotically more efficient than the usual local polynomial estimator (LPE). The latter is an interesting result. According to Ruckstuhl, Welsh and Carroll (2000) and Lin and Carroll (2000), ignoring the correlation structure entirely and "pretending" that the data are really independent will result in more efficient estimators when estimating nonparametric regression with longitudinal or panel data. The result in this paper shows that this is not true when the design points of the nonparametric component have a closeness property within groups. The asymptotic properties of the proposed weighted estimators are derived. In addition, a block bootstrap test is proposed for the goodness of fit of models, which can accommodate the correlations within groups illustrate the finite sample performances of the Some simulation studies are conducted to proposed procedures. 展开更多
关键词 SEMIPARAMETRIC Panel data Local polynomial Weighted estimation Block bootstrap
原文传递
The internal structure models of Europa
14
作者 JIN Sheng JI JiangHui 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第1期156-161,共6页
We model the interior of Europa using a method by which we set three layers of Europa and the composition of each layer in advance. Comparing the calculated mass and radius related to each model with the data derived ... We model the interior of Europa using a method by which we set three layers of Europa and the composition of each layer in advance. Comparing the calculated mass and radius related to each model with the data derived by the observations, we propose three possible internal structure models for Europa. All models are assumed to be differentiated into a metallic core, a (Mg,Fe)2SiO4 silicate mantle and an outer water shell. The only difference amongst these models are the composition of the core. The core of Model I is composed of Fe, while Model II composed of FeS, and the two models are based on the inferences provided by Europa's external gravitational field. Model III has a core which consists of Fe-FeS alloy, similar to that of Earth's outer core. Model I has a Fe core with a radius of 431 km, a (Mg,Fe)2SiO4 mantle with 999 km and a water shell with 132 km. Model II has a 777 km FeS core, a 619 km (Mg,Fe)2SiO4 mantle and a 167 km water shell. Model III has a 571 km Fe0.8(FeS)0.2 core, a 832 km (Mg,Fe)2SiO4 mantle and a 166 km water shell. In all three models, the density range and the radius of each layer is consistent with those deduced by Anderson et al. 展开更多
关键词 EUROPA internal structure equation of state
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部