共查询到19条相似文献,搜索用时 78 毫秒
1.
《中国计量学院学报》2018,(1)
针对推荐系统的准确性提出了一种优化算法,该算法首先利用用户的特征进行聚类,然后在聚类之后的各个聚簇中运用混合协同过滤框架为每个聚簇训练一个模型;同时在运用混合协同过滤时,针对传统的基于用户的协同过滤推荐算法在计算用户相似度方面进行了改进.实验表明,提出的优化算法显著提高了预测的准确性,从而提高了推荐结果的质量. 相似文献
2.
3.
4.
目的 为促进我国邮轮市场的进一步发展,提高乘客的乘坐舒适度,对不同体态特征的乘客进行座面材质的个性化推荐.方法 提出基于多项Logistic回归的邮轮座面材质预测模型方法.结果 选择PP棉、聚氨酯泡沫塑料、乳胶3类市场上常见材质作为实验样本,通过TACTILUS人体压力分布测量系统采集了60位实验对象的人体压力分布数据;计算出SPD值用以反应压力分布的均匀程度,从而确定对应的推荐座面材质;依此数据进行回归模型的监督学习,将预测结果与真实结果比较,该模型结果的混淆矩阵体现了较优的模型精度.结论 将多项Logistic回归与经典模型进行比较,利用多项Logistic回归建立的预测模型能够获得各类别座面材质的推荐概率,模型结果更加直观且预测正确率略高,是适配于不同座面材质压力分布参数预测问题的研究方法,并且可推广该模型用于剔除舒适度水平较低的材质,缩小座面材质的备选范围,在乘客选择座椅时起到辅助设计优化的作用,帮助提高乘客对乘坐舒适性的满意程度. 相似文献
5.
在移动通信业务运营中,目前所采用的传统细分方法通过ARPU值来为客户分类,这种方法存在一些问题和不足。本文引入Logistic回归方法,结合移动通信客户的实际特点与需求,构建具有创新性的客户细分模型,为运营商的客户方案提供客观准确的参考依据。本文所构建的移动通信客户细分方法,能够在把握客户的具体特征的前提下对其进行清晰地分类,有利于运营商实施保持客户的策略。 相似文献
6.
目的 声音是产品和用户之间的一种沟通媒介,为了增进设计师对产品声音的理解、合成与设计匹配,提出一种交互式可视化产品声音数据聚类分析框架。方法 首先通过神经网络将设计师感官描述式信息与声音的特征参数进行融合嵌套;其次基于高斯混合模型来描述非线性几何分布的产品声音数据;最后设计师输入个人先验知识经验参与交互聚类。结果 基于Python的Anaconda3包开发了产品声音交互式聚类的可视化分析实验工具,得到最优化产品声音聚类结果。结论 该产品声音交互聚类可视化分析工具融合了声音技术参数和人脑听觉反应机制,在聚类过程中允许用户参与交互并融入用户的先验知识,并行视图可以实时显示数据元素的流向和判别类别的稳定性。同时,可视化分析可以帮助用户横向比较各聚类结果的异同,样本的比例分布与合理性,以期寻求最优聚类结果。 相似文献
7.
8.
9.
10.
11.
12.
Chunyu Kong 《Accident; analysis and prevention》2010,42(4):987-993
A large number of pedestrian fatalities were reported in China since the 1990s, however the exposure of pedestrians in public traffic has never been measured quantitatively using in-depth accident data. This study aimed to investigate the association between the impact speed and risk of pedestrian casualties in passenger vehicle collisions based on real-world accident cases in China. The cases were selected from a database of in-depth investigation of vehicle accidents in Changsha-IVAC. The sampling criteria were defined as (1) the accident was a frontal impact that occurred between 2003 and 2009; (2) the pedestrian age was above 14; (3) the injury according to the Abbreviated Injury Scale (AIS) was 1+; (4) the accident involved passenger cars, SUVs, or MPVs; and (5) the vehicle impact speed can be determined. The selected IVAC data set, which included 104 pedestrian accident cases, was weighted based on the national traffic accident data. The logistical regression models of the risks for pedestrian fatalities and AIS 3+ injuries were developed in terms of vehicle impact speed using the unweighted and weighted data sets. A multiple logistic regression model on the risk of pedestrian AIS 3+ injury was developed considering the age and impact speed as two variables. It was found that the risk of pedestrian fatality is 26% at 50 km/h, 50% at 58 km/h, and 82% at 70 km/h. At an impact speed of 80 km/h, the pedestrian rarely survives. The weighted risk curves indicated that the risks of pedestrian fatality and injury in China were higher than that in other high-income countries, whereas the risks of pedestrian casualty was lower than in these countries 30 years ago. The findings could have a contribution to better understanding of the exposures of pedestrians in urban traffic in China, and provide background knowledge for the development of strategies for pedestrian protection. 相似文献
13.
基于聚类分析的罐底声发射检测信号融合方法 总被引:2,自引:2,他引:2
采用声发射技术进行罐底腐蚀与泄漏检测过程中,需要对多个传感器的检测到的声发射信号进行融合处理,将属于同一声发射源的声发射信号判定为一个声发射事件。但是在现场检测过程中,由于噪声的存在,使得在声发射信号融合处理时容易对声发射源产生误判。针对该问题,提出了一种基于聚类分析的罐底声发射信号融合方法,其基本原理是先根据事件定义时间进行初始声发射事件判定,然后采用聚类分析方法对初始声发射事件中的信号进行分类,将每一类信号分别判定为一个声发射源。现场实验表明采用该方法抗噪声干扰能力强、误判概率低,能准确反应罐底腐蚀的实际情况。 相似文献
14.
15.
为了准确客观地评价室内空气品质,对桂林市某高校的几栋典型建筑物的7种主要污染物进行实验测试。利用灰色聚类分析方法对测试的室内空气品质进行评价;建立空气品质的评价模型。通过对实验测试数据的分析与计算,得出各测试对象的舒适性程度,实现对所测对象空气质量的评价,并提出改善室内空气品质的主要措施。 相似文献
16.
客户需求信息的准确获取与表达是产品族规划的首要环节,针对客户需求模型构建过程中需求信息具有抽象性、模糊性等特点,基于公理设计构建描述客户需求的模型,运用联合分析法对客户需求进行量化,将模糊的客户需求转换为具体的产品设计指标和参数.通过对指标和参数的相关性分析,建立产品设计关联矩阵.采用模糊最大树聚类算法对设计关联矩阵进行聚类分析,以聚类有效性指标为依据,得到最佳聚类阈值,从而获得最优聚类结果.在此基础上,利用最优聚类结果对设计关联矩阵进行解耦,最终得到解耦设计关联矩阵,为参数化产品族规划提供理论依据.最后,以圆柱齿轮减速器产品族规划为实例,验证了该方法的有效性和可行性. 相似文献
17.
Al-Ghamdi AS 《Accident; analysis and prevention》2002,34(6):11-741
Logistic regression was applied to accident-related data collected from traffic police records in order to examine the contribution of several variables to accident severity. A total of 560 subjects involved in serious accidents were sampled. Accident severity (the dependent variable) in this study is a dichotomous variable with two categories, fatal and non-fatal. Therefore, each of the subjects sampled was classified as being in either a fatal or non-fatal accident. Because of the binary nature of this dependent variable, a logistic regression approach was found suitable. Of nine independent variables obtained from police accident reports, two were found most significantly associated with accident severity, namely, location and cause of accident. A statistical interpretation is given of the model-developed estimates in terms of the odds ratio concept. The findings show that logistic regression as used in this research is a promising tool in providing meaningful interpretations that can be used for future safety improvements in Riyadh. 相似文献
18.