Joint probabilistic data association is an effective method for tracking multiple targets in clutter, but only the target kinematic information is used in measure-to-track association. If the kinematic likelihoods are...Joint probabilistic data association is an effective method for tracking multiple targets in clutter, but only the target kinematic information is used in measure-to-track association. If the kinematic likelihoods are similar for different closely spaced targets, there is ambiguity in using the kinematic information alone; the correct association probability will decrease in conventional joint probabilistic data association algorithm and track coalescence will occur easily. A modified algorithm of joint probabilistic data association with classification-aided is presented, which avoids track coalescence when tracking multiple neighboring targets. Firstly, an identification matrix is defined, which is used to simplify validation matrix to decrease computational complexity. Then, target class information is integrated into the data association process. Performance comparisons with and without the use of class information in JPDA are presented on multiple closely spaced maneuvering targets tracking problem. Simulation results quantify the benefits of classification-aided JPDA for improved multiple targets tracking, especially in the presence of association uncertainty in the kinematic measurement and target maneuvering. Simulation results indicate that the algorithm is valid.展开更多
Teleseismic and GPS data were jointly inverted for the rupture process of the 2011 Tohoku earthquake. The inversion results show that it is a bilateral rupture event with an average rupture velocity less than 2.0 km/s...Teleseismic and GPS data were jointly inverted for the rupture process of the 2011 Tohoku earthquake. The inversion results show that it is a bilateral rupture event with an average rupture velocity less than 2.0 km/s along the fault strike direction. The source rupture process consists of three sub-events, the first oc- curred near the hypocenter and the rest two ruptured along the up-dip direction and broke the sea bed, causing a maximum slip of about 30 m. The large-scale sea bed breakage may account for the tremendous tsunami disaster which resulted in most of the death and missing in this mega earthquake.展开更多
This paper introduces the origin and development of tourism,the cultural connotation of tourism economy,the history of cultural tourism industry,and the strategic changes of business value and economic development in ...This paper introduces the origin and development of tourism,the cultural connotation of tourism economy,the history of cultural tourism industry,and the strategic changes of business value and economic development in the era of big data.The strategy of economic and cultural joint development under the environment of ecological tourism is explored by developing the way of ethnic culture tourism and strengthening the interactive development of culture and economy.The competitive advantage of big data is analyzed and the importance of basic content and data collection is emphasized.In addition,the present situation of tourism market is evaluated and improved by constructing reasonable economic benefit analysis model.展开更多
The processing and interpretation of gravity and gradient data plays an important role in geophysics.The cross gradient joint inversion is usually used for achieving structure coupling of multiple geophysical models. ...The processing and interpretation of gravity and gradient data plays an important role in geophysics.The cross gradient joint inversion is usually used for achieving structure coupling of multiple geophysical models. In order to realize the coupling of gravity and gravity tensor data,the authors analyzed each component.The results show that different types of data contain different direction information,and derived the joint inversion based on cross gradient function and applied it to model data. The theoretical model results show that the cross gradient method can reduce the multi solution and significantly improve the resolution of the inversion.The method was also applied to inverse the gravity tensor data in Vinton salt dome,showing that this method can get higher resolution results than the separate linear inversion,and be closer to the real density from drilling data.展开更多
The cross-gradients joint inversion technique has been applied to multiple geophysical data with a significant improvement on compatibility, but its numerical implementation for practical use is rarely discussed in th...The cross-gradients joint inversion technique has been applied to multiple geophysical data with a significant improvement on compatibility, but its numerical implementation for practical use is rarely discussed in the literature. We present a MATLAB-based three-dimensional cross-gradients joint inversion program with application to gravity and magnetic data. The input and output information was examined with care to create a rational, independent design of a graphical user interface (GUI) and computing kernel. For 3D visualization and data file operations, UBC-GIF tools are invoked using a series of I/O functions. Some key issues regarding the iterative joint inversion algorithm are also discussed: for instance, the forward difference of cross gradients, and matrix pseudo inverse computation. A synthetic example is employed to illustrate the whole process. Joint and separate inversions can be performed flexibly by switching the inversion mode. The resulting density model and susceptibility model demonstrate the correctness of the proposed program.展开更多
In this paper we reparameterize covariance structures in longitudinal data analysis through the modified Cholesky decomposition of itself. Based on this modified Cholesky decomposition, the within-subject covariance m...In this paper we reparameterize covariance structures in longitudinal data analysis through the modified Cholesky decomposition of itself. Based on this modified Cholesky decomposition, the within-subject covariance matrix is decomposed into a unit lower triangular matrix involving moving average coefficients and a diagonal matrix involving innovation variances, which are modeled as linear functions of covariates. Then, we propose a penalized maximum likelihood method for variable selection in joint mean and covariance models based on this decomposition. Under certain regularity conditions, we establish the consistency and asymptotic normality of the penalized maximum likelihood estimators of parameters in the models. Simulation studies are undertaken to assess the finite sample performance of the proposed variable selection procedure.展开更多
The structure-coupled joint inversion method of gravity and magnetic data is a powerful tool for?developing improved physical property models with high resolution and compatible features;?however, the conventional pro...The structure-coupled joint inversion method of gravity and magnetic data is a powerful tool for?developing improved physical property models with high resolution and compatible features;?however, the conventional procedure is inefficient due to the truncated singular values decomposition?(SVD) process at each iteration. To improve the algorithm, a technique using damped leastsquares?is adopted to calculate the structural term of model updates, instead of the truncated SVD. This?produces structural coupled density and magnetization images with high efficiency. A so-called?coupling factor is introduced to regulate the tuning of the desired final structural similarity level.?Synthetic examples show that the joint inversion results are internally consistent and achieve?higher?resolution than separated. The acceptable runtime performance of the damped least squares?technique used in joint inversion indicates that it is more suitable for practical use than the truncated SVD method.展开更多
从众多用户收集的高维数据可用性越来越高,庞大的高维数据涉及用户个人隐私,如何在使用高维数据的同时保护用户的隐私极具挑战性。文中主要关注本地差分隐私下的高维数据发布问题。现有的解决方案首先构建概率图模型,生成输入数据的一...从众多用户收集的高维数据可用性越来越高,庞大的高维数据涉及用户个人隐私,如何在使用高维数据的同时保护用户的隐私极具挑战性。文中主要关注本地差分隐私下的高维数据发布问题。现有的解决方案首先构建概率图模型,生成输入数据的一组带噪声的低维边缘分布,然后使用它们近似输入数据集的联合分布以生成合成数据集。然而,现有方法在计算大量属性对的边缘分布构建概率图模型,以及计算概率图模型中规模较大的属性子集的联合分布时存在局限性。基于此,提出了一种本地差分隐私下的高维数据发布方法PrivHDP(High-dimensional Data Publication Under Local Differential Privacy)。首先,该方法使用随机采样响应代替传统的隐私预算分割策略扰动用户数据,提出自适应边缘分布计算方法计算成对属性的边缘分布构建Markov网。其次,使用新的方法代替互信息度量成对属性间的相关性,引入了基于高通滤波的阈值过滤技术缩减概率图构建过程的搜索空间,结合充分三角化操作和联合树算法获得一组属性子集。最后,基于联合分布分解和冗余消除,计算属性子集上的联合分布。在4个真实数据集上进行实验,结果表明,PrivHDP算法在k-way查询和SVM分类精度方面优于同类算法,验证了所提方法的可用性与高效性。展开更多
基金Defense Advanced Research Project "the Techniques of Information Integrated Processing and Fusion" in the Eleventh Five-Year Plan (513060302).
文摘Joint probabilistic data association is an effective method for tracking multiple targets in clutter, but only the target kinematic information is used in measure-to-track association. If the kinematic likelihoods are similar for different closely spaced targets, there is ambiguity in using the kinematic information alone; the correct association probability will decrease in conventional joint probabilistic data association algorithm and track coalescence will occur easily. A modified algorithm of joint probabilistic data association with classification-aided is presented, which avoids track coalescence when tracking multiple neighboring targets. Firstly, an identification matrix is defined, which is used to simplify validation matrix to decrease computational complexity. Then, target class information is integrated into the data association process. Performance comparisons with and without the use of class information in JPDA are presented on multiple closely spaced maneuvering targets tracking problem. Simulation results quantify the benefits of classification-aided JPDA for improved multiple targets tracking, especially in the presence of association uncertainty in the kinematic measurement and target maneuvering. Simulation results indicate that the algorithm is valid.
基金financially supported by the National Natural Science Foundation of China (Nos. 90915012 and 41090291)the Research Project in Earthquake Science, CEA (No.201108002)
文摘Teleseismic and GPS data were jointly inverted for the rupture process of the 2011 Tohoku earthquake. The inversion results show that it is a bilateral rupture event with an average rupture velocity less than 2.0 km/s along the fault strike direction. The source rupture process consists of three sub-events, the first oc- curred near the hypocenter and the rest two ruptured along the up-dip direction and broke the sea bed, causing a maximum slip of about 30 m. The large-scale sea bed breakage may account for the tremendous tsunami disaster which resulted in most of the death and missing in this mega earthquake.
基金the professional brand construction project in Jiangsu Colleges and Universities(PPZY2015A098)
文摘This paper introduces the origin and development of tourism,the cultural connotation of tourism economy,the history of cultural tourism industry,and the strategic changes of business value and economic development in the era of big data.The strategy of economic and cultural joint development under the environment of ecological tourism is explored by developing the way of ethnic culture tourism and strengthening the interactive development of culture and economy.The competitive advantage of big data is analyzed and the importance of basic content and data collection is emphasized.In addition,the present situation of tourism market is evaluated and improved by constructing reasonable economic benefit analysis model.
基金Supported by Project of National Key Research and Development Plan(No.2017YFC0601606,2017YFC0602203)National Science and Technology Major Project(No.2016ZX05027-002-03)+1 种基金National Natural Science Foundation of China(No.41604098,41404089) State Key Program of National Natural Science of China(No.41430322)
文摘The processing and interpretation of gravity and gradient data plays an important role in geophysics.The cross gradient joint inversion is usually used for achieving structure coupling of multiple geophysical models. In order to realize the coupling of gravity and gravity tensor data,the authors analyzed each component.The results show that different types of data contain different direction information,and derived the joint inversion based on cross gradient function and applied it to model data. The theoretical model results show that the cross gradient method can reduce the multi solution and significantly improve the resolution of the inversion.The method was also applied to inverse the gravity tensor data in Vinton salt dome,showing that this method can get higher resolution results than the separate linear inversion,and be closer to the real density from drilling data.
基金Supported by the National Natural Science Foundation of China (No. 61001105), the National Science and Technology Major Projects (No. 2011ZX03001- 007- 03) and Beijing Natural Science Foundation (No. 4102043).
文摘The cross-gradients joint inversion technique has been applied to multiple geophysical data with a significant improvement on compatibility, but its numerical implementation for practical use is rarely discussed in the literature. We present a MATLAB-based three-dimensional cross-gradients joint inversion program with application to gravity and magnetic data. The input and output information was examined with care to create a rational, independent design of a graphical user interface (GUI) and computing kernel. For 3D visualization and data file operations, UBC-GIF tools are invoked using a series of I/O functions. Some key issues regarding the iterative joint inversion algorithm are also discussed: for instance, the forward difference of cross gradients, and matrix pseudo inverse computation. A synthetic example is employed to illustrate the whole process. Joint and separate inversions can be performed flexibly by switching the inversion mode. The resulting density model and susceptibility model demonstrate the correctness of the proposed program.
文摘In this paper we reparameterize covariance structures in longitudinal data analysis through the modified Cholesky decomposition of itself. Based on this modified Cholesky decomposition, the within-subject covariance matrix is decomposed into a unit lower triangular matrix involving moving average coefficients and a diagonal matrix involving innovation variances, which are modeled as linear functions of covariates. Then, we propose a penalized maximum likelihood method for variable selection in joint mean and covariance models based on this decomposition. Under certain regularity conditions, we establish the consistency and asymptotic normality of the penalized maximum likelihood estimators of parameters in the models. Simulation studies are undertaken to assess the finite sample performance of the proposed variable selection procedure.
文摘The structure-coupled joint inversion method of gravity and magnetic data is a powerful tool for?developing improved physical property models with high resolution and compatible features;?however, the conventional procedure is inefficient due to the truncated singular values decomposition?(SVD) process at each iteration. To improve the algorithm, a technique using damped leastsquares?is adopted to calculate the structural term of model updates, instead of the truncated SVD. This?produces structural coupled density and magnetization images with high efficiency. A so-called?coupling factor is introduced to regulate the tuning of the desired final structural similarity level.?Synthetic examples show that the joint inversion results are internally consistent and achieve?higher?resolution than separated. The acceptable runtime performance of the damped least squares?technique used in joint inversion indicates that it is more suitable for practical use than the truncated SVD method.
文摘从众多用户收集的高维数据可用性越来越高,庞大的高维数据涉及用户个人隐私,如何在使用高维数据的同时保护用户的隐私极具挑战性。文中主要关注本地差分隐私下的高维数据发布问题。现有的解决方案首先构建概率图模型,生成输入数据的一组带噪声的低维边缘分布,然后使用它们近似输入数据集的联合分布以生成合成数据集。然而,现有方法在计算大量属性对的边缘分布构建概率图模型,以及计算概率图模型中规模较大的属性子集的联合分布时存在局限性。基于此,提出了一种本地差分隐私下的高维数据发布方法PrivHDP(High-dimensional Data Publication Under Local Differential Privacy)。首先,该方法使用随机采样响应代替传统的隐私预算分割策略扰动用户数据,提出自适应边缘分布计算方法计算成对属性的边缘分布构建Markov网。其次,使用新的方法代替互信息度量成对属性间的相关性,引入了基于高通滤波的阈值过滤技术缩减概率图构建过程的搜索空间,结合充分三角化操作和联合树算法获得一组属性子集。最后,基于联合分布分解和冗余消除,计算属性子集上的联合分布。在4个真实数据集上进行实验,结果表明,PrivHDP算法在k-way查询和SVM分类精度方面优于同类算法,验证了所提方法的可用性与高效性。