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Testability evaluation using prior information of multiple sources 认领 引用 被引量：10
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作者 Wang Chao Qiu Jing +1 位作者 Liu Guanjun Zhang Yong 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第4期867-874,共8页
Testability plays an important role in improving the readiness and decreasing the lifecycle cost of equipment. Testability demonstration and evaluation is of significance in measuring such testability indexes as fault... Testability plays an important role in improving the readiness and decreasing the lifecycle cost of equipment. Testability demonstration and evaluation is of significance in measuring such testability indexes as fault detection rate（FDR） and fault isolation rate（FIR）, which is useful to the producer in mastering the testability level and improving the testability design, and helpful to the consumer in making purchase decisions. Aiming at the problems with a small sample of testability demonstration test data（TDTD） such as low evaluation confidence and inaccurate result, a testability evaluation method is proposed based on the prior information of multiple sources and Bayes theory. Firstly, the types of prior information are analyzed. The maximum entropy method is applied to the prior information with the mean and interval estimate forms on the testability index to obtain the parameters of prior probability density function（PDF）, and the empirical Bayesian method is used to get the parameters for the prior information with a success-fail form. Then, a parametrical data consistency check method is used to check the compatibility between all the sources of prior information and TDTD. For the prior information to pass the check, the prior credibility is calculated. A mixed prior distribution is formed based on the prior PDFs and the corresponding credibility. The Bayesian posterior distribution model is acquired with the mixed prior distribution and TDTD, based on which the point and interval estimates are calculated.Finally, examples of a flying control system are used to verify the proposed method. The results show that the proposed method is feasible and effective. 展开更多
关键词 Bayes theory Consistency check Multiple sources Prior credibility Prior information Testability evaluation
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MR IMAGE RECONSTRUCTION BASED ON COMPREHENSIVE SPARSE PRIOR 认领 引用
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作者 Ding Xinghao Chen Xianbo +1 位作者 Huang Yue Mi Zengyuan 《Journal of Electronics(China)》 2012年第6期611-616,共6页
In this paper, a novel Magnetic Resonance (MR) reconstruction framework which combines image-wise and patch-wise sparse prior is proposed. For addressing, a truncated beta-Bernoulli process is firstly employed to enfo... In this paper, a novel Magnetic Resonance (MR) reconstruction framework which combines image-wise and patch-wise sparse prior is proposed. For addressing, a truncated beta-Bernoulli process is firstly employed to enforce sparsity on overlapping image patches emphasizing local structures. Due to its properties, beta-Bernoulli process can adaptive infer the sparsity (number of non-zero coefficients) of each patch, an appropriate dictionary, and the noise variance simultaneously, which are prerequisite for iterative image reconstruction. Secondly, a General Gaussian Distribution (GGD) prior is introduced to engage image-wise sparsity for wavelet coefficients, which can be then estimated by a threshold denoising algorithm. Finally, MR image is reconstructed by patch-wise estimation, image-wise estimation and under-sampled k-space data with least square data fitting. Experimental results have demonstrated that proposed approach exhibits excellent reconstruction performance. Moreover, if the image is full of similar low-dimensional-structures, proposed algorithm has dramatically improved Peak Signal to Noise Ratio (PSNR) 7～9 dB, with comparisons to other state-of-art compressive sampling methods. 展开更多
关键词 Image-wise sparse prior Patch-wise sparse prior Beta-Bernoulli process Low-dimensional-structure Compressive sampling
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Effects of Prior Corrosion with and Without Stress on the Mechanical Properties of 7475-T761 Aluminum Alloy 认领 引用 被引量：6
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作者 Zuo-Yan Ye Dao-Xin Liu +3 位作者 Meng Yuan Xiao-Ming Zhang Zhi Yang Ming-Xia Lei 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第5期608-613,共6页
The effect of prior corrosion on the mechanical properties of 7475-T761 aluminum alloy was investigated by immersion test, stress corrosion test, cathode charge method and electrochemical polarization test. Results sh... The effect of prior corrosion on the mechanical properties of 7475-T761 aluminum alloy was investigated by immersion test, stress corrosion test, cathode charge method and electrochemical polarization test. Results show that prior corrosion in the solution with 3 wt% NaC1 and 0.5 wt% H202 leads to mechanical properties deterioration of 7475-T761 aluminum alloy. Moreover, the elongation decreases significantly. This is mainly attributed to electrochemical corrosion and hydrogen embrittlement, in which corrosion plays a major role. Tensile stress promotes the degradation of the mechanical properties by accelerating the pitting corrosion and hydrogen embrittlement. 展开更多
关键词 Prior corrosion Corrosion with stress 7475 aluminum alloy Mechanical properties Hydrogen embrittlement
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医疗保健干预性系统评价再评价报告规范:PRIOR声明解读 认领 引用 被引量：2
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作者 安然逊 徐园 +9 位作者 石浩然 邓海波 王磊 孙建华 王晓杰 王钰 朱丽筠 鲁乔丹 周新艺 马玉芬 《中国循证医学杂志》 CSCD 北大核心 2023年第8期978-987,共10页
为促进系统评价再评价的全面与准确报告,BMJ于2022年8月发表了医疗保健干预性系统评价再评价报告规范:PRIOR声明。本文介绍PRIOR声明的产生背景与核心内容,并结合实例对各条目进行解读,以期为国内学者撰写系统评价再评价提供借鉴。
关键词 PRIOR 系统评价再评价 报告规范 解读
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Characterization of the prior particle boundaries in a powder metallurgy Ti2AlNb alloy 认领 引用 被引量：3
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作者 Jinhu Zhang Jinmin Liu +3 位作者 Dongsheng Xu Jie Wu Lei Xu Rui Yang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第11期2513-2525,共13页
Ti2 AlNb-based alloy powder metallurgy(PM)compacts were prepared via hot isostatic pressing(HIP)under relatively low temperature(920 and 980℃)and at certain pressure(130 MPa).The microstructure,composition and orient... Ti2 AlNb-based alloy powder metallurgy(PM)compacts were prepared via hot isostatic pressing(HIP)under relatively low temperature(920 and 980℃)and at certain pressure(130 MPa).The microstructure,composition and orientation of B2,α2 and O phases in the compacts were characterized and analyzed with an aim to investigate the effect of unsuitable HIPping parameters on the appearance of prior particle boundary(PPB),which seriously affects the mechanical properties of the alloy.The results show that moreα2 phase is the characteristics of the PPB in Ti2AlNb-based alloy when HIPped at relatively low temperature.Increasing HIPping temperature to the upper part of the two-phase region can effectively inhibit the formation of PPB.Electron backscatter diffraction measurements show the specific orientation relationship between phases,which helps us understand the origin of a2 and O phase and the corresponding transformation path.The HIPping at a higher temperature can weaken the micro-texture intensity of theα2 and O phase due to the increase of misorientation in B2 phase.Theα2 phase at cell wall keeps the Burgers orientation relationship(BOR)with the grain on one side,and does not satisfy the BOR with the other.It is found that some O phase variants inside the cell HIPped at 980℃can only maintainα2-O OR withα2 owing to theα2→O phase transformation forming the O phase,while these O variants deviate from B2-O OR with B2 phase. 展开更多
关键词 Powder metallurgy Titanium alloys Hot isostatic pressing Prior particle boundary(PPB) Microtexture Ti-22Al-24Nb-0.5Mo alloy
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Structure learning on Bayesian networks by finding the optimal ordering with and without priors 认领 引用 被引量：5
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作者 HE Chuchao GAO Xiaoguang GUO Zhigao 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2018年第6期1209-1227,共19页
Ordering based search methods have advantages over graph based search methods for structure learning of Bayesian networks in terms on the efficiency. With the aim of further increasing the accuracy of ordering based s... Ordering based search methods have advantages over graph based search methods for structure learning of Bayesian networks in terms on the efficiency. With the aim of further increasing the accuracy of ordering based search methods, we first propose to increase the search space, which can facilitate escaping from the local optima. We present our search operators with majorizations, which are easy to implement. Experiments show that the proposed algorithm can obtain significantly more accurate results. With regard to the problem of the decrease on efficiency due to the increase of the search space, we then propose to add path priors as constraints into the swap process. We analyze the coefficient which may influence the performance of the proposed algorithm, the experiments show that the constraints can enhance the efficiency greatly, while has little effect on the accuracy. The final experiments show that, compared to other competitive methods, the proposed algorithm can find better solutions while holding high efficiency at the same time on both synthetic and real data sets. 展开更多
关键词 Bayesian network structure learning ordering search space graph search space prior constraint
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Effect of silicon and prior deformation of austenite on isothermal transformation in low carbon steels 认领 引用 被引量：2
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作者 Minghui CAI Hua DING +1 位作者 Jiansu ZHANG Long LI 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS 2009年第2期100-109,共10页
Isothermal transformation （TTT） behavior of the low carbon steels with two Si contents （0.50 wt pct and 1.35 wt pct） was investigated with and without the prior deformation. The results show that Si and the prior ... Isothermal transformation （TTT） behavior of the low carbon steels with two Si contents （0.50 wt pct and 1.35 wt pct） was investigated with and without the prior deformation. The results show that Si and the prior deformation of the austenite have significant effects on the transformation of the ferrite and bainite. The addition of Si refines the ferrite grains, accelerates the polygonal ferrite transformation and the formation of M/A constituents, leading to the improvement of the strength. The ferrite grains formed under the prior deformation of the austenite become more homogeneous and refined. However, the influence of deformation on the tensile strength of both steels is dependent on the isothermal temperatures. Thermodynamic calculation indicates that Si and prior deformation reduce the incubation time of both ferrite and bainite transformation, but the effect is weakened by the decrease of the isothermal temperatures. 展开更多
关键词 Low carbon steel Si content Prior deformation of austenite Ferrite transformation Bainite transformation
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Dark channel prior based blurred image restoration method using total variation and morphology 认领 引用 被引量：1
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作者 Yibing Li Qiang Fu +1 位作者 Fang Ye Hayaru Shouno 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2015年第2期359-366,共8页
The blurred image restoration method can dramatically highlight the image details and enhance the global contrast, which is of benefit to improvement of the visual effect during practical ap- plications. This paper is... The blurred image restoration method can dramatically highlight the image details and enhance the global contrast, which is of benefit to improvement of the visual effect during practical ap- plications. This paper is based on the dark channel prior principle and aims at the prior information absent blurred image degradation situation. A lot of improvements have been made to estimate the transmission map of blurred images. Since the dark channel prior principle can effectively restore the blurred image at the cost of a large amount of computation, the total variation （TV） and image morphology transform （specifically top-hat transform and bottom- hat transform） have been introduced into the improved method. Compared with original transmission map estimation methods, the proposed method features both simplicity and accuracy. The es- timated transmission map together with the element can restore the image. Simulation results show that this method could inhibit the ill-posed problem during image restoration, meanwhile it can greatly improve the image quality and definition. 展开更多
关键词 image restoration dark channel prior total variation (TV) morphology transform
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ASSESSING LOCAL PRIOR INFLUENCE IN BAYESIAN ANALYSIS 认领 引用
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作者 SHIH JIANQING 《Applied Mathematics(A Journal of Chinese Universities)》 1995年第2期123-132,共10页
A general method for assessing local influence of minor perturbations of prior in Bayesian analysis is developed in this paper. U8ing some elementary ideas from differelltial geometryl we provide a unified approach fo... A general method for assessing local influence of minor perturbations of prior in Bayesian analysis is developed in this paper. U8ing some elementary ideas from differelltial geometryl we provide a unified approach for handling a variety of problexns of local prior influence. AS applications, we discuss the local influence of small perturbstions of normal-gamma prior density in linear model and investigate local prior influence from the predictive view. 展开更多
关键词 Local prior influence curvature Kullback-Leibler divergence Fisher information normal-gamma prior predictive distribution.
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Does the Penrose Suggestion as to Black Holes from a Prior Universe Showing Up in Today’s Universe Have Credibility? Examined from a Singular, and Nonsingular Beginning of Cosmological Expansion 认领 引用 被引量：1
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作者 Andrew Walcott Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2021年第1期149-171,共23页
We examine if there are grounds to entertain the Penrose suggestion as to black holes from a prior cycle of creation appearing in the present cosmos. There are two cases to consider. One a singular start to the Univer... We examine if there are grounds to entertain the Penrose suggestion as to black holes from a prior cycle of creation appearing in the present cosmos. There are two cases to consider. One a singular start to the Universe or as Karen Freeze and others have modeled a non-singular start. The two cases are different and touch upon the limits of validity of the Penrose singularity theorem. We will first of all state the two cases, singular and nonsingular, and then afterwards, briefly allude to the Penrose singularity theorem. The plausibility of the singular cosmological expansion start point w case analysis of Black holes from a prior universe will be discussed first Afterwards, a synopsis of the Penrose singularity theorem. After that, the Nonsingular case of a starting point of the expansion of the Universe will be entertained and described. Since the nonsingular start to the expansion of the Universe is not so well known, a considerable amount of space will be spent upon what I view as mathematical constructions allowing for its analysis. About the only way to ascertain these cases will be by GW astronomy, hence the details of GW production from the early Universe will be covered in excruciating detail. The methodology for that section is simple. Use a construction for a minimal time-step, then from there get emergent space-time conditions for a bridge from a nonsingular start to the universe, to potential Quantum gravity conditions. Our Methodology is to construct using a “trivial” solution to massive gravitons, and a nonsingular start for expansion of the universe. Our methodology has many unintended consequences, not the least is a relationship between a small timestep, which is called t, and then the minimum scale factor and even the tension or property values of the initial space-time wall, all of which are a consequence of a “trivial” solution taking into account “massive” gravitons. From there we next will in future articles postulate conditions for experimental detectors for subsequent data sets to obtain falsifiable data sets. Finally upon doing this, the outlines of the way to ascertain data sets as to either falsify or confirm the Penrose suggestion will be the final concluding part of the manuscript. 展开更多
关键词 Minimum Scale Factor Cosmological Constant Space-Time Bubble Penrose Singularity Prior Universe Black Holes
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Some Likelihood Based Properties in Large Samples: Utility and Risk Aversion, Second Order Prior Selection and Posterior Density Stability 认领 引用
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作者 Michael Brimacombe 《Open Journal of Statistics》 2016年第6期1037-1049,共13页
The likelihood function plays a central role in statistical analysis in relation to information, from both frequentist and Bayesian perspectives. In large samples several new properties of the likelihood in relation t... The likelihood function plays a central role in statistical analysis in relation to information, from both frequentist and Bayesian perspectives. In large samples several new properties of the likelihood in relation to information are developed here. The Arrow-Pratt absolute risk aversion measure is shown to be related to the Cramer-Rao Information bound. The derivative of the log-likelihood function is seen to provide a measure of information related stability for the Bayesian posterior density. As well, information similar prior densities can be defined reflecting the central role of likelihood in the Bayes learning paradigm. 展开更多
关键词 Arrow-Pratt Theorem Expected Utility Information Similar Priors Likelihood Function Prior Stability Score Function Risk Aversion
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Analytical Investigation of Prior Austenite Grain Size Dependence of Low Temperature Toughness in Steel Weld Metal 认领 引用 被引量：4
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作者 X.F. Zhang P. Hall +2 位作者 H. Terasak M. Sato Y. Komizo 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2012年第3期241-248,共8页
Prior austenite grain size dependence of the low temperature impact toughness has been addressed in the bainitic weld metals by in situ observations.Usually,decreasing the grain size is the only approach by which both... Prior austenite grain size dependence of the low temperature impact toughness has been addressed in the bainitic weld metals by in situ observations.Usually,decreasing the grain size is the only approach by which both the strength and the toughness of a steel are increased.However,low carbon bainitic steel with small grain size shows a weakening of the low temperature impact toughness in this study.By direct tracking of the morphological evolution during phase transformation,it is found that large austenite grain size dominates the nucleation of intragranular acicular ferrite,whereas small austenite grain size leads to grain boundary nucleation of bainite.This kinetics information will contribute to meet the increasing low temperature toughness requirement of weld metals for the storage tanks and offshore structures. 展开更多
关键词 In situ observation Prior austenite grain size Low temperature toughness Intragranular nucleation Grain boundary nucleation
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A distribution prior model for airplane segmentation without exact template 认领 引用 被引量：1
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作者 DAI Ming ZHOU Zhiheng GUO Yongfan 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2020年第1期56-63,共8页
In many practical applications of image segmentation problems,employing prior information can greatly improve segmentation results.This paper continues to study one kind of prior information,called prior distribution.... In many practical applications of image segmentation problems,employing prior information can greatly improve segmentation results.This paper continues to study one kind of prior information,called prior distribution.Within this research,there is no exact template of the object;instead only several samples are given.The proposed method,called the parametric distribution prior model,extends our previous model by adding the training procedure to learn the prior distribution of the objects.Then this paper establishes the energy function of the active contour model(ACM)with consideration of this parametric form of prior distribution.Therefore,during the process of segmenting,the template can update itself while the contour evolves.Experiments are performed on the airplane data set.Experimental results demonstrate the potential of the proposed method that with the information of prior distribution,the segmentation effect and speed can be both improved efficaciously. 展开更多
关键词 image segmentation active contour model(ACM) prior distribution level set method
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Experimental and simulated characterization of creep behavior of P92 steel with prior cyclic loading damage 认领 引用 被引量：1
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作者 Wei Zhang Xiaowei Wang +2 位作者 Jianming Gong Yong Jiang Xin Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2017年第12期1540-1548,共9页
The effect of prior cyclic loading on creep behavior of P92 steel was investigated. Creep tests on prior cyclic loading exposure specimens were performed at 650？C and 130 MPa. In order to clarify the influence of pri... The effect of prior cyclic loading on creep behavior of P92 steel was investigated. Creep tests on prior cyclic loading exposure specimens were performed at 650？C and 130 MPa. In order to clarify the influence of prior cyclic loading on creep behavior, optical microscope, scanning electron microscope and transmission electron microscope were used. Experimental results indicate that the prior cyclic loading degrades the creep strength significantly. However, the degradation tends to be saturated with further increase in prior cyclic loading. From the view of microstructural evolution, the recovery of martensite laths takes place during prior cyclic loading exposure. This facilitates the dislocation movement during the following creep process. Therefore, premature rupture of creep test occurs. Additionally, saturated behavior of degradation can be attributed to the near completed recovery of martensite laths. Based on the effect of prior cyclic loading, a newly modified Hayhurst creep damage model was proposed to consider the prior cyclic loading damage. The main advantage of the proposed model lies in its ability to directly predict creep behavior with different levels of prior cyclic loading damage. Comparison of the predicted and experimental results shows that the proposed model can give a reasonable prediction for creep behavior of P92 steel with different level of prior cyclic loading damage. 展开更多
关键词 Prior cyclic loading Creep behavior Martensite morphology Life prediction
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Influence of prior austenite grain size on the critical strain for completion of DEFT through hot compression test 认领 引用 被引量：1
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作者 Jing Tian Wangyue Yang +1 位作者 Zuqing Sun Jianping He 《Journal of University of Science and Technology Beijing》 2006年第2期135-138,共4页
A low carbon steel was used to determine the critical strain εc for completion of deformation enhanced ferrite transformation （DEFT） through a series of hot compression tests. In addition, the influence of prior au... A low carbon steel was used to determine the critical strain εc for completion of deformation enhanced ferrite transformation （DEFT） through a series of hot compression tests. In addition, the influence of prior austenite grain size （PAGS） on the critical strain was systematically investigated. Experimental results showed that the critical strain is affected by PAGS. When γ→α transformation completes, the smaller the PAGS is, the smaller the critical strain is. The ferrite grains obtained through DEFT can be refined to about 3 μm when the DEFT is completed. 展开更多
关键词 low carbon steel hot compression deformation enhanced ferrite transformation critical strain prior austenite grain size
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In situ NMR diffusion coefficients assessment of lithium ion conductor using electrochemical priors and Arrhenius constraint——A computational study 认领 引用 被引量：1
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作者 Liang Deng Wen-Hui Yang +3 位作者 Xing Lyu Shu-Feng Wei Zheng Wang Hui-Xian Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第2期362-366,共5页
In situ NMR measurements of the diffusion coefficients,including an estimate of signal strength,of lithium ion conductor using diffusion-weighting pulse sequence are performed in this study.A cascade bilinear model is... In situ NMR measurements of the diffusion coefficients,including an estimate of signal strength,of lithium ion conductor using diffusion-weighting pulse sequence are performed in this study.A cascade bilinear model is proposed to estimate the diffusion sensitivity factors of pulsed-field gradient using prior information of the electrochemical performance and Arrhenius constraint.The model postulates that the active lithium nuclei participating electrochemical reaction are relevant to the NMR signal intensity,when discharge rate or temperature condition is varying.The electrochemical data and the NMR signal strength show a highly fit with the proposed model according our simulation and experiments.Furthermore,the diffusion time is constrained by temperature based on Arrhenius equation of reaction rates dependence.An experimental calculation of Li_4Ti_5O_（12）（LTO）/carbon nanotubes（CNTs） with the electrolyte evaluating at 20 ℃ is presented,which the b factor is estimated by the discharge rate. 展开更多
关键词 Lithium ion conductor Diffusion coefficient Nuclear magnetic resonance Pulsed-field gradient Electrochemical priors
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Smoothness Prior Approach for Spectral Smoothing and Baseline Correction 认领 引用
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作者 Lu Li He Chen +2 位作者 Siying Chen Yinchao Zhang Long Gao 《Journal of Beijing Institute of Technology》 EI CAS 2017年第1期121-128,共8页
Smoothness prior approach for spectral smoothing is investigated using Fourier frequency filter analysis.We show that the regularization parameter in penalized least squares could continuously control the bandwidth of... Smoothness prior approach for spectral smoothing is investigated using Fourier frequency filter analysis.We show that the regularization parameter in penalized least squares could continuously control the bandwidth of low-pass filter.Besides,due to its property of interpolating the missing values automatically and smoothly,a spectral baseline correction algorithm based on the approach is proposed.This algorithm generally comprises spectral peak detection and baseline estimation.First,the spectral peak regions are detected and identified according to the second derivatives.Then,generalized smoothness prior approach combining identification information could estimate the baseline in peak regions.Results with both the simulated and real spectra show accurate baseline-corrected signals with this method. 展开更多
关键词 smoothness priors low-pass filter second derivative spectral smoothing baselinecorrection
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Analysis of the stress intensity factor of welded joints under prior corrosion and complex stress fields 认领 引用
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作者 Zhiyu Jie Yadong Li Xing Wei 《Journal of Modern Transportation》 2016年第4期270-276,共7页
Taking cruciform welded joints under different corrosion degrees, together with 45° inclined angle and full penetration load-carrying fillet, as the research object, the stress intensity factor of a quarter-circu... Taking cruciform welded joints under different corrosion degrees, together with 45° inclined angle and full penetration load-carrying fillet, as the research object, the stress intensity factor of a quarter-circular comer crack of welded joints is calculated based on FRANC3D with ABAQUS. Effects of different corrosion pit sizes, crack aspect ratios, and crack depths on stress intensity factor are analyzed. The results show that pit depth plays a major role in stress intensity factor, while the effect of pit radius is relatively small. The cracking modes of the surface and the deepest point are mode I, and mixed modes I and II, respectively. Effects of pit depths, crack aspect ratios, and crack depths on the stress intensity factor at the surface point are greater than at the deepest point. 展开更多
关键词 Stress intensity factor Welded joint Prior corrosion Complex stress field. Numerical simulation
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One-Sample Bayesian Predictive Analyses for a Nonhomogeneous Poisson Process with Delayed S-Shaped Intensity Function Using Non-Informative Priors 认领 引用
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作者 Otieno Collins Orawo Luke Akong’o Matiri George Munene 《Open Journal of Statistics》 2023年第5期717-733,共17页
The delayed S-shaped software reliability growth model (SRGM) is one of the non-homogeneous Poisson process (NHPP) models which have been proposed for software reliability assessment. The model is distinctive because ... The delayed S-shaped software reliability growth model (SRGM) is one of the non-homogeneous Poisson process (NHPP) models which have been proposed for software reliability assessment. The model is distinctive because it has a mean value function that reflects the delay in failure reporting: there is a delay between failure detection and reporting time. The model captures error detection, isolation, and removal processes, thus is appropriate for software reliability analysis. Predictive analysis in software testing is useful in modifying, debugging, and determining when to terminate software development testing processes. However, Bayesian predictive analyses on the delayed S-shaped model have not been extensively explored. This paper uses the delayed S-shaped SRGM to address four issues in one-sample prediction associated with the software development testing process. Bayesian approach based on non-informative priors was used to derive explicit solutions for the four issues, and the developed methodologies were illustrated using real data. 展开更多
关键词 Failure Intensity Non-Informative Priors Software Reliability Model Bayesian Approach Non-Homogeneous Poisson Process
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基于融合降噪先验与多尺度特征聚合的微地震震源定位方法 认领 引用 被引量：1
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作者 黄建平 王秋阳 +5 位作者 李媛媛 黎国龙 路依霖 李三福 段文胜 雷刚林 《中国石油大学学报（自然科学版）》 EI CAS CSCD 北大核心 2026年第1期65-75,共11页
随着地震勘探采集数据量的激增,传统微地震定位方法难以满足当前水力压裂实时定位的需求且在采集过程中受环境噪声干扰,导致信噪比较低,影响震源定位精度。为此,提出一种基于深度学习的自监督-监督混合学习方法,首先采用卷积降噪自编码... 随着地震勘探采集数据量的激增,传统微地震定位方法难以满足当前水力压裂实时定位的需求且在采集过程中受环境噪声干扰,导致信噪比较低,影响震源定位精度。为此,提出一种基于深度学习的自监督-监督混合学习方法,首先采用卷积降噪自编码器(CDAE)进行自监督预训练,在去噪的同时学习数据中的波形特征;随后将CDAE的编码器部分作为特征提取模块,与全卷积定位模块级联,构建联合定位模型;最后利用少量标签数据微调网络,实现从含噪的微地震数据到震源空间分布的非线性映射。通过线性模型和Marmousi-2模型进行试验测试并与U-Net等网络进行对比。结果表明,提出的联合定位网络在仅使用少量标签数据训练情况下,仍可实现高精度震源定位效果。 展开更多
关键词 微地震监测 降噪先验 特征聚合 震源定位 深度学习
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