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Bayesian network model for traffic flow estimation using prior link flows 被引量:5
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作者 朱森来 程琳 褚昭明 《Journal of Southeast University(English Edition)》 EI CAS 2013年第3期322-327,共6页
In order to estimate traffic flow a Bayesian network BN model using prior link flows is proposed.This model sets link flows as parents of the origin-destination OD flows. Under normal distribution assumptions the mode... In order to estimate traffic flow a Bayesian network BN model using prior link flows is proposed.This model sets link flows as parents of the origin-destination OD flows. Under normal distribution assumptions the model considers the level of total traffic flow the variability of link flows and the violation of the conservation law.Using prior link flows the prior distribution of all the variables is determined. By updating some observed link flows the posterior distribution is given.The variances of the posterior distribution normally decrease with the progressive update of the link flows. Based on the posterior distribution point estimations and the corresponding probability intervals are provided. To remove inconsistencies in OD matrices estimation and traffic assignment a combined BN and stochastic user equilibrium model is proposed in which the equilibrium solution is obtained through iterations.Results of the numerical example demonstrate the efficiency of the proposed BN model and the combined method. 展开更多
关键词 traffic flow estimation Gaussian Bayesiannetwork evidence propagation combined method
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New method of online testing and data processing for LED lamps
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作者 郝剑 荆雷 +5 位作者 客洪亮 王尧 高群 王潇洵 孙强 续志军 《Journal of Southeast University(English Edition)》 EI CAS 2016年第4期415-419,共5页
In order to achieve quick and accurate lifetime prediction of LED lighting products under the testing time of 2 000 h, a method of online testing of luminous flux is proposed under the condition of temperature stress.... In order to achieve quick and accurate lifetime prediction of LED lighting products under the testing time of 2 000 h, a method of online testing of luminous flux is proposed under the condition of temperature stress.Exponential fitting of lumen maintenance, the Bayesian estimation of failure probability, the Weibull distribution of lifetime and the Arrhenius model of the decay rate are used in combination to acquire the distribution of failure probability over time at the ambient temperatures of 25 ℃. The lifetime test of the same lamps based on the Energy Star standard under the testing time of 6 000 h is also implemented to verify the effectiveness of the method. The errors of lifetimes acquired with the proposed method are 7%, 4%, 3% and 1% at the failure probabilities of 62. 3%, 10%, 5% and 1%,respectively. 展开更多
关键词 online testing accelerated test Bayesian estimation reliability analysis
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Minimax Estimation of the Function of Parameters in Normal Distribution 被引量:2
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作者 MENG Hong-ling KANG Jin-xuan ZHANG Kai-guang 《Chinese Quarterly Journal of Mathematics》 CSCD 北大核心 2006年第2期242-245,共4页
The estimation of the functionθ=exp{αμ+bσ2} of parameters (μ,σ2) in normal distribution N(μ,σ2) is discussed. And when the prior distributions ofμandσ2 are independent, under the loss function L(θ,δ)=(θ-1... The estimation of the functionθ=exp{αμ+bσ2} of parameters (μ,σ2) in normal distribution N(μ,σ2) is discussed. And when the prior distributions ofμandσ2 are independent, under the loss function L(θ,δ)=(θ-1×δ-1)2, the Bayesian estimation and the existence and computing method on minimax estimation are deeply discussed. 展开更多
关键词 normal distribution logarithmic normal distribution prior distribution Bayesian estimation minimax estimation
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Reliability analysis of DOOF for Weibull distribution 被引量:2
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作者 陈文华 崔杰 +2 位作者 樊晓燕 卢献彪 相平 《Journal of Zhejiang University Science》 EI CSCD 2003年第4期448-453,共6页
Hierarchical Bayesian method for estimating the failure probability Pi under DOOF by taking the quasi-Beta distribution B(pi-1 , 1,1, b ) as the prior distribution is proposed in this paper. The weighted Least Squa... Hierarchical Bayesian method for estimating the failure probability Pi under DOOF by taking the quasi-Beta distribution B(pi-1 , 1,1, b ) as the prior distribution is proposed in this paper. The weighted Least Squares Estimate method was used to obtain the formula for computing reliability distribution parameters and estimating the reliability characteristic values under DOOF. Taking one type of aerospace electrical connectoras an example, the correctness of the above method through statistical analysis of electrical connector acceler-ated life test data was verified. 展开更多
关键词 DOOF(Data only one failure) data Hierarchical Bayesian estimate Reliability analysis
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Compressed Multi-image Reconstruction Based on Quantization Noise Distribution 被引量:1
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作者 程燕 方向忠 《Journal of Donghua University(English Edition)》 EI CAS 2007年第6期756-761,共6页
Because of the quantization noise introduced during the compression,super-resolution reconstruction(SRR)techniques are complicated for the compressed images.This paper aims to incorporate the prior knowledge of discre... Because of the quantization noise introduced during the compression,super-resolution reconstruction(SRR)techniques are complicated for the compressed images.This paper aims to incorporate the prior knowledge of discrete cosine transform(DCT)coefficients into modeling the quantization noise.The spatial covariance matrix of the quantization noise is estimated by utilizing the Laplacian distribution of the alternating current(AC)coefficients.After estimating the spatial joint covariance of overall noises for the imaging system,we propose a general Bayesian framework to enhance the resolution for compressed images.Experiments demonstrate the effectiveness of the proposed algorithm and show the superiority to previous methods in objective and subjective aspects. 展开更多
关键词 SUPER-RESOLUTION quantization noise COVARIANCE BAYESIAN
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E-Bayesian Estimation of the Products Reliability when Testing Reveals no Failure 被引量:1
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作者 韩明 《Chinese Quarterly Journal of Mathematics》 CSCD 2009年第3期407-414,共8页
This paper develops a new method, named E-Bayesian estimation method, to estimate the reliability parameters. The E-Bayesian estimation method of the reliability are derived for the zero-failure data from the product ... This paper develops a new method, named E-Bayesian estimation method, to estimate the reliability parameters. The E-Bayesian estimation method of the reliability are derived for the zero-failure data from the product with Binomial distribution. Firstly, for the product reliability, the definitions of E-Bayesian estimation were given, and on the base, expressions of the E-Bayesian estimation and hierarchical Bayesian estimation of the products reliability was given. Secondly, discuss properties of the E-Bayesian estimation. Finally, the new method is applied to a real zero-failure data set, and as can be seen, it is both efficient and easy to operate. 展开更多
关键词 RELIABILITY zero-failure data E-Bayesian estimation hierarchical Bayesian estimation
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Improved seismoacoustic analysis model and its application to source parameter inversion of near-surface small-yield chemical explosions 被引量:4
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作者 Zhang Liang-Yong Li Xin +4 位作者 Liang Xu-Bin Wang Tong-Dong Tang Shi-Ying Zhang De-Zhi Zeng Xin-Wu 《Applied Geophysics》 SCIE CSCD 2021年第1期17-30,128,共15页
The seismoacoustic analysis method has broad potential applications to source parameter estimation for near-surface explosion events such as industrial explosions and terrorist attacks.In this study,current models wer... The seismoacoustic analysis method has broad potential applications to source parameter estimation for near-surface explosion events such as industrial explosions and terrorist attacks.In this study,current models were improved by modifying the acoustic model and adopting the Bayesian Markov-chain-Monte-Carlo inversion method.The source parameters of near-surface small-yield chemical explosions were analyzed via the improved seismoacoustic analysis model and by the estimation accuracy of seismoacoustic joint inversion.Estimation and analysis results showed that the improved seismoacoustic analysis model considered ground shock coupling and the impact of explosion products ejecting from the surface so that the improved acoustic impulse relation was more consistent with the measured data than the Ford impulse relation.It is suitable for deep-burial,shallow-burial,and near-surface aerial explosions.Furthermore,trade-off relationships were declined through the application of the improved model to source parameter inversion for near-surface small-yield chemical explosions,and source parameter estimation accuracy was improved. 展开更多
关键词 Near-surface chemical explosion small yield seismoacoustic analysis estimation of source parameters Bayesian MCMC method.
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Bayesian Estimation in Dam Monitoring Networks 被引量:1
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作者 Joo Manuel Martins Casaca Pedro Jorge Bele Mateus Joeo de Jesus Isidoro Coelho 《Journal of Civil Engineering and Architecture》 2011年第2期185-190,共6页
A Bayesian estimator with informative prior distributions (a multi-normal and an inverted gamma distribution), adequate to displacement estimation at dam displacement monitoring networks, is presented. The hyper-par... A Bayesian estimator with informative prior distributions (a multi-normal and an inverted gamma distribution), adequate to displacement estimation at dam displacement monitoring networks, is presented. The hyper-parameters of the prior distributions are obtained by Bayesian empirical methods with non-informative meta-priors. The performances of the Bayes estimator and the classical generalized lest squares estimator are compared using two measurements of the horizontal monitoring network of a concrete gravity dam: the Penha Garcia dam (Portugal). In order to test the robustness of the two estimators, a gross error is added to one of the measured horizontal directions: the Bayes estimator proves to be significantly more robust than the classic maximum likelihood estimator. 展开更多
关键词 Bayes estimator hyper-parameter parametric elicitation prior distribution.
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Asymptotically Optimal and Admissible Empirical Bayes Estimation of Normal Parameter
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作者 LIU Huan-xiang SHI Yi-min +1 位作者 ZHANG Su-mei ZHOU Bing-chang 《Chinese Quarterly Journal of Mathematics》 CSCD 北大核心 2007年第1期1-6,共6页
Under square loss, this paper constructs the empirical Bayes(EB) estimation for the parameter of normal distribution which has both asymptotic optimality and admissibility. Moreover, the convergence rate of the EB e... Under square loss, this paper constructs the empirical Bayes(EB) estimation for the parameter of normal distribution which has both asymptotic optimality and admissibility. Moreover, the convergence rate of the EB estimation obtained is proved to be O(n^-1). 展开更多
关键词 empirical Bayes estimation asymptotic optimality ADMISSIBILITY
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DECLARATIVE HYBRID ROUTING PROTOCOLS IN AD HOC NETWORKS
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作者 Gao Xiang Li Zhongyuan Wang Min 《Journal of Electronics(China)》 2013年第4期341-351,共11页
This paper presents adaptive hybrid protocols based on the declarative network and mainly discusses the principle and realization of the Bayesian-estimation based adaptive hybrid protocol in the declarative network, w... This paper presents adaptive hybrid protocols based on the declarative network and mainly discusses the principle and realization of the Bayesian-estimation based adaptive hybrid protocol in the declarative network, which is well adapted to the Mobile Ad hoc NETwork (MANET). The adaptive hybrid protocol is designed for ad hoc networks which have characteristics like self-organizing, no trusted party, flexibility, etc. The nodes that run the hybrid protocol can automatically select one routing protocol that is suitable for different network environment. The Bayesian-estimation based adaptive strategy, that improves the adaptability and stability of the protocol, succeeds in the Rapidnet, a declarative network engine. The result in the Rapidnet proves that the hybrid protocol and the adaptive strategy are feasible. The experiment on the ns-3 simulator, an emerging discrete-event network simulator, validates that this protocol performs well and reduces communication overheads. 展开更多
关键词 Declarative network Bayesian estimation Hybrid routing protocol Adaptive strategy Mobile Ad hoc NETwork (MANET)
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Development of Bayesian Network Models for Risk-Based Ship Design 被引量:3
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作者 Dimitris Konovessis Wenkui Cai Dracos Vassalos 《Journal of Marine Science and Application》 2013年第2期140-151,共12页
In the past fifteen years, the attention of ship safety treatment as an objective rather than a constraint has started to sweep through the whole maritime industry. The risk-based ship design (RBD) methodology, advo... In the past fifteen years, the attention of ship safety treatment as an objective rather than a constraint has started to sweep through the whole maritime industry. The risk-based ship design (RBD) methodology, advocating systematic integration of risk assessment within the conventional design process has started to takeoff. Despite this wide recognition and increasing popularity, important factors that could potentially undermine the quality of the results come from both quantitative and qualitative aspects during the risk assessment process. This paper details a promising solution by developing a formalized methodology for risk assessment through effective storing and processing of historical data combined with data generated through first-principle approaches. This method should help to generate appropriate risk models in the selected platform (Bayesian networks) which can be employed for decision making at design stare. 展开更多
关键词 risk-based ship design risk assessment data mining Bayesian networks ship safety
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Nonlinear diffusion methods based on robust statistics for noise removal
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作者 贾迪野 黄凤岗 苏菡 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第3期440-444,共5页
A novel smoothness term of Bayesian regularization framework based on M-estimation of robust statistics is proposed, and from this term a class of fourth-order nonlinear diffusion methods is proposed. These methods at... A novel smoothness term of Bayesian regularization framework based on M-estimation of robust statistics is proposed, and from this term a class of fourth-order nonlinear diffusion methods is proposed. These methods attempt to approximate an observed image with a piecewise linear image, which looks more natural than piecewise constant image used to approximate an observed image by P-M model. It is known that M-estimators and W-estimators are essentially equivalent and solve the same minimization problem. Then, we propose PL bilateral filter from equivalent W-estimator. This new model is designed for piecewise linear image filtering, which is more effective than normal bilateral filter. 展开更多
关键词 Bayesian regularization M-ESTIMATION nonlinear diffusion bilateral filter
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Bayesian Segmentation of Piecewise Linear Regression Models Using Reversible Jump MCMC Algorithm
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作者 Suparman Michel Doisy 《Computer Technology and Application》 2015年第1期14-18,共5页
Piecewise linear regression models are very flexible models for modeling the data. If the piecewise linear regression models are matched against the data, then the parameters are generally not known. This paper studie... Piecewise linear regression models are very flexible models for modeling the data. If the piecewise linear regression models are matched against the data, then the parameters are generally not known. This paper studies the problem of parameter estimation ofpiecewise linear regression models. The method used to estimate the parameters ofpicewise linear regression models is Bayesian method. But the Bayes estimator can not be found analytically. To overcome these problems, the reversible jump MCMC (Marcov Chain Monte Carlo) algorithm is proposed. Reversible jump MCMC algorithm generates the Markov chain converges to the limit distribution of the posterior distribution of the parameters ofpicewise linear regression models. The resulting Markov chain is used to calculate the Bayes estimator for the parameters of picewise linear regression models. 展开更多
关键词 Piecewise linear regression models hierarchical bayesian reversible jump MCMC.
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债权压力下财政政策与货币政策的动态互动效应——一个开放经济的DSGE模型 被引量:17
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作者 朱军 《财贸经济》 CSSCI 北大核心 2016年第6期5-17,共13页
目前的文献忽视了持有国外债权贬值对中国的影响,也忽视了这一背景下政府财政与货币政策的互动效应。通过构建含"债权压力"的开放经济DSGE模型,本文采用"贝叶斯"估计方法进行了理论研究。研究发现:(1)财政政策对货... 目前的文献忽视了持有国外债权贬值对中国的影响,也忽视了这一背景下政府财政与货币政策的互动效应。通过构建含"债权压力"的开放经济DSGE模型,本文采用"贝叶斯"估计方法进行了理论研究。研究发现:(1)财政政策对货币政策响应、货币政策对财政政策不响应是符合我国宏观经济事实特征的模式选择。(2)债权压力冲击在短期内会提升社会总产出,但持续期非常短。(3)地方政府公共支出的冲击效应大于中央支出的政策效应。(4)外部产出冲击和地方财政支出冲击对社会总产出的波动贡献较大;外部产出冲击对中国通货膨胀的波动影响也日益增大。 展开更多
关键词 债权压力 DSGE模型 “贝叶斯”估计 互动效应
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The impact of ancestral population size and incomplete lineage sorting on Bayesian estimation of species divergence times 被引量:1
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作者 Konstantinos ANGELIS Mario DOS REIS 《Current Zoology》 SCIE CAS CSCD 2015年第5期874-885,共12页
Although the effects of the coalescent process on sequence divergence and genealogies are well understood, the vir- tual majority of studies that use molecular sequences to estimate times of divergence among species h... Although the effects of the coalescent process on sequence divergence and genealogies are well understood, the vir- tual majority of studies that use molecular sequences to estimate times of divergence among species have failed to account for the coalescent process. Here we study the impact of ancestral population size and incomplete lineage sorting on Bayesian estimates of species divergence times under the molecular clock when the inference model ignores the coalescent process. Using a combination of mathematical analysis, computer simulations and analysis of real data, we find that the errors on estimates of times and the molecular rate can be substantial when ancestral populations are large and when there is substantial incomplete lineage sorting. For example, in a simple three-species case, we find that if the most precise fossil calibration is placed on the root of the phylogeny, the age of the internal node is overestimated, while if the most precise calibration is placed on the internal node, then the age of the root is underestimated. In both cases, the molecular rate is overestimated. Using simulations on a phylogeny of nine species, we show that substantial errors in time and rate estimates can be obtained even when dating ancient divergence events. We analyse the hominoid phylogeny and show that estimates of the neutral mutation rate obtained while ignoring the coalescent are too high. Using a coalescent-based technique to obtain geological times of divergence, we obtain estimates of the mutation rate that are within experimental estimates and we also obtain substantially older divergence times within the phylogeny [Current Zoology 61 (5): 874-885, 2015]. 展开更多
关键词 Ancestral polymorphism Incomplete lineage sorting Divergence time estimation Gene tree Species tree
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Linear Bayes Estimators Applied to the Inverse Gaussian Lifetime Model 被引量:1
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作者 WANG Lichun PETTIT Lawrence 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2016年第6期1683-1692,共10页
For the two-parameter inverse Gaussian distribution denoted by IG(μ,A), the authors employ a linear Bayes procedure to estimate the parameters μ and A. The superiority of the proposed linear Bayes estimator (LBE... For the two-parameter inverse Gaussian distribution denoted by IG(μ,A), the authors employ a linear Bayes procedure to estimate the parameters μ and A. The superiority of the proposed linear Bayes estimator (LBE) over both the classical UMVUE and the maximum likelihood estimator (MLE) is established in terms of the mean squared error matrix (MSEM) criterion. Compared with the usual Bayes estimator, which is obtained by an MCMC method, the proposed LBE is simple and easy to use. Some numerical results are presented to verify that the LBE performs well. 展开更多
关键词 Linear Bayes method MCMC method mean squared error matrix (MSEM) quadraticloss.
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THE SUPERIORITIES OF BAYES LINEAR UNBIASED ESTIMATION IN PARTITIONED LINEAR MODEL 被引量:6
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作者 Weiping ZHANG Laisheng WEI Yu CHEN 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2011年第5期945-954,共10页
In this article, the Bayes linear unbiased estimation (BALUE) of parameters is derived for the partitioned linear model. The superiorities of the BALUE over ordinary least square estimator (LSE) are studied in ter... In this article, the Bayes linear unbiased estimation (BALUE) of parameters is derived for the partitioned linear model. The superiorities of the BALUE over ordinary least square estimator (LSE) are studied in terms of the Bayes mean square error matrix (BMSEM) criterion and Pitman closeness (PC) criterion. 展开更多
关键词 Bayes linear unbiased estimation Bayes mean square error matrix criterion least squareestimation partitioned linear model Pitman closeness criterion.
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Approximate Gaussian conjugacy: parametric recursive filtering under nonlinearity, multimodality, uncertainty, and constraint, and beyond 被引量:8
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作者 Tian-cheng LIn Jin-ya SU +1 位作者 Wci LIU Juan M. CORCHADO 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2017年第12期1913-1939,共27页
Since the landmark work of R. E. Kalman in the 1960s, considerable efforts have been devoted to time series state space models for a large variety of dynamic estimation problems. In particular, parametric filters that... Since the landmark work of R. E. Kalman in the 1960s, considerable efforts have been devoted to time series state space models for a large variety of dynamic estimation problems. In particular, parametric filters that seek analytical estimates based on a closed-form Markov-Bayes recursion, e.g., recursion from a Gaussian or Gaussian mixture (GM) prior to a Gaussian/GM posterior (termed 'Gaussian conjugacy' in this paper), form the backbone for a general time series filter design. Due to challenges arising from nonlinearity, multimodality (including target maneuver), intractable uncertainties (such as unknown inputs and/or non-Gaussian noises) and constraints (including circular quantities), etc., new theories, algorithms, and technologies have been developed continuously to maintain such a conjugacy, or to approximate it as close as possible. They had contributed in large part to the prospective developments of time series parametric filters in the last six decades. In this paper, we review the state of the art in distinctive categories and highlight some insights that may otherwise be easily overlooked. In particular, specific attention is paid to nonlinear systems with an informative observation, multimodal systems including Gaussian mixture posterior and maneuvers, and intractable unknown inputs and constraints, to fill some gaps in existing reviews and surveys. In addition, we provide some new thoughts on alternatives to the first-order Markov transition model and on filter evaluation with regard to computing complexity. 展开更多
关键词 Kalman filter Gaussian filter Time series estimation Bayesian filtering Nonlinear filtering Constrained filtering Gaussian mixture MANEUVER Unknown inputs
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Application of Bayesian approach to hydrological frequency analysis 被引量:7
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作者 LIANG ZhongMin LI BinQuan +1 位作者 YU ZhongBo CHANG Wen Juan 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第5期1183-1192,共10页
An existing Bayesian flood frequency analysis method is applied to quantile estimation for Pearson type three (P-III) probability distribution. The method couples prior and sample information under the framework of Ba... An existing Bayesian flood frequency analysis method is applied to quantile estimation for Pearson type three (P-III) probability distribution. The method couples prior and sample information under the framework of Bayesian formula, and the Markov Chain Monte Carlo (MCMC) sampling approach is used to estimate posterior distributions of parameters. Different from the original sampling algorithm (i.e. the important sampling) used in the existing approach, we use the adaptive metropolis (AM) sampling technique to generate a large number of parameter sets from Bayesian parameter posterior distributions in this paper. Consequently, the sampling distributions for quantiles or the hydrological design values are constructed. The sampling distributions of quantiles are estimated as the Bayesian method can provide not only various kinds of point estimators for quantiles, e.g. the expectation estimator, but also quantitative evaluation on uncertainties of these point estimators. Therefore, the Bayesian method brings more useful information to hydrological frequency analysis. As an example, the flood extreme sample series at a gauge are used to demonstrate the procedure of application. 展开更多
关键词 Bayesian theory hydrological frequency analysis Markov Chain Monte Carlo prior distribution posterior distribution
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Superiority of empirical Bayes estimator of the mean vector in multivariate normal distribution
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作者 YUAN Min WAN ChongLi WEI LaiSheng 《Science China Mathematics》 SCIE CSCD 2016年第6期1175-1186,共12页
In this paper, the Bayes estimator and the parametric empirical Bayes estimator(PEBE) of mean vector in multivariate normal distribution are obtained. The superiority of the PEBE over the minimum variance unbiased est... In this paper, the Bayes estimator and the parametric empirical Bayes estimator(PEBE) of mean vector in multivariate normal distribution are obtained. The superiority of the PEBE over the minimum variance unbiased estimator(MVUE) and a revised James-Stein estimators(RJSE) are investigated respectively under mean square error(MSE) criterion. Extensive simulations are conducted to show that performance of the PEBE is optimal among these three estimators under the MSE criterion. 展开更多
关键词 multivariate normal distribution mean vector MVUE PEBE RJSE mean square error
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