2011-07-15
利用三维粒子图像示踪测速技术,进行了不同泥沙粒径、比重和水力比降条件下推移质颗粒的三维运动速度测量,并统计分析了其概率密度分布特性。试验结果表明:颗粒紊动的概率密度基本遵循正态分布,纵向流速处于
中央高校基本科研业务费专项资金项目(2009B08014)
高等学校博士学科点专项科研基金新教师课题(200802941028)
水文水资源及水利工程科学国家重点实验室基本科研业务费自主研究项目(2011585712)
国家自然科学基金青年科学基金项目(50909036)
水文水资源及水利工程科学国家重点实验室,河海大学,河海大学水利水电学院,南京 210098
#水利工程#
2011-01-06
。本文提出了采用gamma分布对多个典型城域网链路的实际流量样本的概率密度分布曲线进行拟合。大量的实验证实,用gamma分布能够比较精确地反映骨干网网络流量的概率密度分布。
2015-04-22
连续概率密度曲线图。同时,利用获得的股票价格的概率密度曲线图得到未来股票价格最高概率点下对应的预测值,这样可以获得更高的股票价格预测精度。我们不仅可以获得预测当天股票价格概率密度值,同时也可以获得未来
ZHAO Xu,CHENG Weihu,XIONG Linhai,YANG Zhenhai
In this paper parameter generalized Pareto distribution(GPD) is considered.The problem of estimating parameters of the GPD is studiedwhen the data available are upper record values.We develop Randomized Estimate (RE) for the location and scaleparameters.The Randomized Estimates for the parameters are derived from Fisher's fiducial inference.It sees parameter as constant, but the parameter can be estimated by random variable.RE not only obeys classical statistics, but also agrees to fiducial inference that parameter can be defined as random variable.In addition, new parameter tests, called Vertical Density Representation (VDR), are studied for the location and scale parameters of the GPD basing on the upper records.The superiority of the proposed method is thatthe distributions of pivots are exact distribution instead of approximate distribution.The combination of the RE and VDR technique is applied to parameter hypothesis test.Simulation studies show that simulated level of hypothesis tests forthe parameters are close to a significant level.The advantage of this simulated P value method is needless to simulate the percentage points of test statistics.As an universal tool,the VDR test could be applied to solve statistical inference.
2016-12-16
Doctoral Program of Higher Education of China Foundation (20131103120027)
Beijing Natural Science Foundation(1154005)
College of Applied Science, Beijing University of Technology, Beijing 100124,College of Applied Science, Beijing University of Technology, Beijing 100124,College of Applied Science, Beijing University of Technology, Beijing 100124,College of Applied Science, Beijing University of Technology, Beijing 100124
2017-01-16
针对短波恶劣信道下猝发信号盲检测与起止时刻提取问题,提出一种基于短时傅里叶变换谱归一化概率密度函数的算法,利用谱归一化概率密度函数最大值在目标信号出现与仅有噪声时存在着明显的界限的特点,设置适当门限
哈尔滨工程大学信息与通信工程学院,哈尔滨 150001,哈尔滨工程大学信息与通信工程学院,哈尔滨 150001
2012-07-03
学习方法,给出了一种基于数值天气预报信息的风电场输出功率的短期多时段联合概率密度预测方法。该方法依据CCC-MGARCH模型思想,将未来多个时段风电场输出功率的联合概率密度预测问题分解为风电场在各个时段独立
山东大学电气工程学院,济南 250061,山东大学电气工程学院,济南 250061
#动力与电气工程#
2017-01-26
转子盘结构,提出了一种基于概率密度演化的多变量概率失效风险分析方法。该方法的计算效率远高于相同精度下的传统蒙特卡洛模拟法,并通过AC33.14所提供的校准算例进行了合理性验证。
2009-06-10
单峰分布概率密度函数的建立为描述金融统计项目的分布状况提供了一种新的统计分析方法。本文根据模拟居民户存款的数据应用单峰分布概率密度函数来描述其分布曲线,并进行实例演算以得出给定区间的概率。目的是:使
云南曲靖地区统计学会者海镇2-24-6统计科研小组,广东省中山火炬开发区职业技术学院,云南省民族大学继续教育学院
#数学#
This paper aims to investigate the stochastic P-bifurcations in the tri-stable van der Pol-Duffing oscillator with Gauss white noise. By using the stochastic averaging method, the stationary probability density function of amplitude is obtained. Then based on the singularity theory of the deterministic system, the explicit parameter conditions for P-bifurcation are deduced, eleven types of qualitatively different probability density curves are founded. Finally the effects of three coefficients, one for linear damping and two for random excitation strength, are discussed. The results are verified by Monte-Carlo numerical simulations. The method used here is also suitable for other systems' P-bifurcation analysis.
2012-12-27
The project supported by the National Natural Science Foundation of China(11172198)
Ministry of Education Found for the Dotroal(2009003211005)
School of Mechanical Engineering, Tianjin University, TianJin 300072,School of Mechanical Engineering, Tianjin University
2016-05-12
废旧产品的回收价格和再制造成本与回收质量有密切的关系,本文针对回收质量的不确定性,采用概率密度函数对其进行了定量描述,建立了回收价格和再制造成本与回收质量的函数关系,并在此基础上建立了生产商责任延伸
国家自然科学基金(71473077)
国家863计划资助项目(2013AA040206)
湖南大学汽车车身先进设计制造国家重点实验室,长沙 410082,湖南大学汽车车身先进设计制造国家重点实验室,长沙 410082,湖南大学汽车车身先进设计制造国家重点实验室,长沙 410082
#管理学#