A new authentication algorithm for grid identity trusted computing unlimited by hardware is presented;the trusted root is made as an image data.The grid entity is trusted in the soft platform when its feature of image...A new authentication algorithm for grid identity trusted computing unlimited by hardware is presented;the trusted root is made as an image data.The grid entity is trusted in the soft platform when its feature of image root is entirely matched with that from the other entities＇ feature database in a scale space process.To recognize and detect the stable image root feature,the non-homogeneous linear expandable scale space is proposed.Focusing on relations between the scale parameter of the inhomogeneous Gaussian function terms and the space evolution of thermal diffusion homogeneous equations,three space evolution operators are constructed to exact and mark the feature from image root.Analysis and verification are carried on the new scale space,operators and the core of making decisions for grid entities certifications.展开更多
This paper proposes a model for image restoration by combining the wavelet shrinkage and inverse scale space （ISS） method. The ISS is applied to the wavelet representation to modify the retained wavelet coefficients...This paper proposes a model for image restoration by combining the wavelet shrinkage and inverse scale space （ISS） method. The ISS is applied to the wavelet representation to modify the retained wavelet coefficients, and the coefficients smaller than the threshold are set to zero. The curvature term of the ISS can remove the edge artifacts and preserve sharp edges. For the multiscale interpretation of the ISS and the multiscale property of the wavelet representation, small details are preserved. This paper illustrates that the wavelet ISS model can be deduced from the wavelet based on a total variation minimization problem. A stopping criterion is obtained from this minimization in the sense of the Bregman distance in the wavelet domain. Numerical examples show the improvement for the image denoising with the proposed method in the sense of the signal to noise ratio and with fewer details remained in the residue.展开更多
In some applications,there are signals with piecewise structure to be recovered.In this paper,we propose a piecewise_ISS(P_ISS)method which aims to preserve the piecewise sparse structure(or the small-scaled entries)o...In some applications,there are signals with piecewise structure to be recovered.In this paper,we propose a piecewise_ISS(P_ISS)method which aims to preserve the piecewise sparse structure(or the small-scaled entries)of piecewise signals.In order to avoid selecting redundant false small-scaled elements,we also implement the piecewise_ISS algorithm in parallel and distributed manners equipped with a deletion rule.Numerical experiments indicate that compared with alSS,the P_ISS algorithm is more effective and robust for piecewise sparse recovery.展开更多
We propose a framework of hand articulation detection from a monocular depth image using curvature scale space(CSS) descriptors. We extract the hand contour from an input depth image, and obtain the fingertips and fin...We propose a framework of hand articulation detection from a monocular depth image using curvature scale space(CSS) descriptors. We extract the hand contour from an input depth image, and obtain the fingertips and finger-valleys of the contour using the local extrema of a modified CSS map of the contour. Then we recover the undetected fingertips according to the local change of depths of points in the interior of the contour. Compared with traditional appearance-based approaches using either angle detectors or convex hull detectors, the modified CSS descriptor extracts the fingertips and finger-valleys more precisely since it is more robust to noisy or corrupted data;moreover, the local extrema of depths recover the fingertips of bending fingers well while traditional appearance-based approaches hardly work without matching models of hands. Experimental results show that our method captures the hand articulations more precisely compared with three state-of-the-art appearance-based approaches.展开更多
The Noether symmetry and the conserved quantity on time scales in event space are studied in this paper. Firstly, the Lagrangian of parameter forms on time scales in event space are established. The Euler-Lagrange equ...The Noether symmetry and the conserved quantity on time scales in event space are studied in this paper. Firstly, the Lagrangian of parameter forms on time scales in event space are established. The Euler-Lagrange equations and the second EulerLagrange equations of variational calculus on time scales in event space are established. Secondly, based upon the invariance of the Hamilton action on time scales in event space under the infinitesimal transformations of a group, the Noether symmetry and the conserved quantity on time scales in event space are established.Finally, an example is given to illustrate the method and results.展开更多
This paper mainly focuses on the issues about generic multi-scale object perception for detection or recognition. A novel computational model in visually-feature space is presented for scene & object representatio...This paper mainly focuses on the issues about generic multi-scale object perception for detection or recognition. A novel computational model in visually-feature space is presented for scene & object representation to purse the underlying textural manifold statistically in nonparametric manner. The associative method approximately makes perceptual hierarchy in human-vision biologically coherency in specific quad-tree-pyramid structure, and the appropriate scale-value of different objects can automatically be selected by evaluating from well-defined scale function without any priori knowledge. The sufficient experiments truly demonstrate the effectiveness of scale determination in textural manifold with object localization rapidly.展开更多
The closure of a turbulence field is a longstanding fundamental problem, while most closure models are introduced in spectral space. Inspired by Chou＇s quasi-normal closure method in spectral space, we propose an ana...The closure of a turbulence field is a longstanding fundamental problem, while most closure models are introduced in spectral space. Inspired by Chou＇s quasi-normal closure method in spectral space, we propose an analytical closure model for isotropic turbulence based on the extended scale similarity theory of the velocity structure function in physical space. The assumptions and certain approximations are justified with direct numerical simulation. The asymptotic scaling properties are reproduced by this new closure method, in comparison to the classical Batchelor model.展开更多
In this paper, we have studied the perfect fluid distribution in the scale invariant theory of gravitation, when the space-time described by Einstein-Rosen metric with a time dependent gauge function. The cosmological...In this paper, we have studied the perfect fluid distribution in the scale invariant theory of gravitation, when the space-time described by Einstein-Rosen metric with a time dependent gauge function. The cosmological equations for this space-time with gauge function are solved and some physical properties of the model are studied.展开更多
目的了解国外公园绿地服务设计研究热点和趋势,为我国服务设计介入城市公园绿地服务质量改进提供理论指导和建议。方法系统检索Web of Science核心合集数据库、Scopus、Embase、Ebsco、Science Direct、EI Compendex等6个数据库中公园...目的了解国外公园绿地服务设计研究热点和趋势,为我国服务设计介入城市公园绿地服务质量改进提供理论指导和建议。方法系统检索Web of Science核心合集数据库、Scopus、Embase、Ebsco、Science Direct、EI Compendex等6个数据库中公园绿地和服务设计相关文献,使用Bicomb软件进行关键词词频统计并构建词篇矩阵和共现矩阵,使用SPSS进行关键词聚类挖掘研究热点并进一步通过多维尺度分析了解热点之间的影响关系、识别潜力节点、探索未来发展趋势。结果共检索相关文献360篇,系统聚类结果表明国外公园绿地服务设计研究围绕公园绿地的环境保护和社会效益、以用户体验为中心的服务设计理论与运用、多元主体视角下公园绿地的包容性与公平性、利益相关者参与的可持续环境共创四大热点议题展开,多维尺度分析结果表明四大议题处于不同研究地位与发展阶段。结论未来公园绿地的服务设计研究应当致力于推动生态系统服务与效益共生、推进服务设计理论顶层设计和实践探索、强化公平性评估与协同设计体系,以及深化跨学科融合与数字化技术介入。展开更多
针对低温大空间室内雪乐园因保冷需求与功能特殊性导致的防火分区划分困难、疏散距离超标等火灾防控设计难题,提出“防火单元+动态疏散”的复合设计策略。通过BS 9999:2017 Code of Practice for Fire Safety in the Design,Management ...针对低温大空间室内雪乐园因保冷需求与功能特殊性导致的防火分区划分困难、疏散距离超标等火灾防控设计难题,提出“防火单元+动态疏散”的复合设计策略。通过BS 9999:2017 Code of Practice for Fire Safety in the Design,Management and Use of Duildings风险分级理论与火灾荷载控制方法,构建“主分区-防火单元”分级防火体系;结合低温环境下人员密度分层模型与疏散路径优化算法,提出动态疏散优化方案;并通过火灾动力学模拟与人员疏散模拟对设计模型进行多场景验证。试验结果表明,火灾场景下可用安全疏散时间(ASET>1800 s)显著超过必需疏散时间(RSET=408 s),烟气毒性指标(一氧化碳浓度<500 ppm)与能见度(>10 m)均满足安全阈值。研究结果表明,该设计策略在保障人员安全疏散的同时,实现了功能与安全的平衡,为低温大空间建筑消防规范修订与工程实践提供理论支撑。展开更多
基金Foundation item: Supported by the National Natural Science Foundation (61070151,60903203,61103246)the Natural Science Foundation of Fujian Province (2010J01353)+1 种基金the Xiamen University of Technology Scientific Research Foundation (YKJ11024R)Xiamen Scientific Research Foundation (3502Z20123037)
文摘A new authentication algorithm for grid identity trusted computing unlimited by hardware is presented;the trusted root is made as an image data.The grid entity is trusted in the soft platform when its feature of image root is entirely matched with that from the other entities＇ feature database in a scale space process.To recognize and detect the stable image root feature,the non-homogeneous linear expandable scale space is proposed.Focusing on relations between the scale parameter of the inhomogeneous Gaussian function terms and the space evolution of thermal diffusion homogeneous equations,three space evolution operators are constructed to exact and mark the feature from image root.Analysis and verification are carried on the new scale space,operators and the core of making decisions for grid entities certifications.
基金supported by the National Natural Science Foundation of China (61101208)
文摘This paper proposes a model for image restoration by combining the wavelet shrinkage and inverse scale space （ISS） method. The ISS is applied to the wavelet representation to modify the retained wavelet coefficients, and the coefficients smaller than the threshold are set to zero. The curvature term of the ISS can remove the edge artifacts and preserve sharp edges. For the multiscale interpretation of the ISS and the multiscale property of the wavelet representation, small details are preserved. This paper illustrates that the wavelet ISS model can be deduced from the wavelet based on a total variation minimization problem. A stopping criterion is obtained from this minimization in the sense of the Bregman distance in the wavelet domain. Numerical examples show the improvement for the image denoising with the proposed method in the sense of the signal to noise ratio and with fewer details remained in the residue.
基金National Natural Science Foundation of China(Nos.11871137,11471066,11290143)the Fundamental Research of Civil Aircraft(No.MJ-F-2012-04)。
文摘In some applications,there are signals with piecewise structure to be recovered.In this paper,we propose a piecewise_ISS(P_ISS)method which aims to preserve the piecewise sparse structure(or the small-scaled entries)of piecewise signals.In order to avoid selecting redundant false small-scaled elements,we also implement the piecewise_ISS algorithm in parallel and distributed manners equipped with a deletion rule.Numerical experiments indicate that compared with alSS,the P_ISS algorithm is more effective and robust for piecewise sparse recovery.
基金supported by the National Natural Science Foundation of China(Nos.6122700461370120+5 种基金6139051061300065and 61402024)Beijing Municipal Natural Science Foundation,China(No.4142010)Beijing Municipal Commission of Education,China(No.km201410005013)the Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality,China
文摘We propose a framework of hand articulation detection from a monocular depth image using curvature scale space(CSS) descriptors. We extract the hand contour from an input depth image, and obtain the fingertips and finger-valleys of the contour using the local extrema of a modified CSS map of the contour. Then we recover the undetected fingertips according to the local change of depths of points in the interior of the contour. Compared with traditional appearance-based approaches using either angle detectors or convex hull detectors, the modified CSS descriptor extracts the fingertips and finger-valleys more precisely since it is more robust to noisy or corrupted data;moreover, the local extrema of depths recover the fingertips of bending fingers well while traditional appearance-based approaches hardly work without matching models of hands. Experimental results show that our method captures the hand articulations more precisely compared with three state-of-the-art appearance-based approaches.
基金Supported by the National Natural Science Foundation of China(11572212 and 11272227)the Innovation Program for Postgraduate in Higher Education Institutions of Jiangsu Province(KYZZ15_0349)the Innovation Program of USTS(SKCX15_061)
文摘The Noether symmetry and the conserved quantity on time scales in event space are studied in this paper. Firstly, the Lagrangian of parameter forms on time scales in event space are established. The Euler-Lagrange equations and the second EulerLagrange equations of variational calculus on time scales in event space are established. Secondly, based upon the invariance of the Hamilton action on time scales in event space under the infinitesimal transformations of a group, the Noether symmetry and the conserved quantity on time scales in event space are established.Finally, an example is given to illustrate the method and results.
文摘This paper mainly focuses on the issues about generic multi-scale object perception for detection or recognition. A novel computational model in visually-feature space is presented for scene & object representation to purse the underlying textural manifold statistically in nonparametric manner. The associative method approximately makes perceptual hierarchy in human-vision biologically coherency in specific quad-tree-pyramid structure, and the appropriate scale-value of different objects can automatically be selected by evaluating from well-defined scale function without any priori knowledge. The sufficient experiments truly demonstrate the effectiveness of scale determination in textural manifold with object localization rapidly.
文摘The closure of a turbulence field is a longstanding fundamental problem, while most closure models are introduced in spectral space. Inspired by Chou＇s quasi-normal closure method in spectral space, we propose an analytical closure model for isotropic turbulence based on the extended scale similarity theory of the velocity structure function in physical space. The assumptions and certain approximations are justified with direct numerical simulation. The asymptotic scaling properties are reproduced by this new closure method, in comparison to the classical Batchelor model.
文摘In this paper, we have studied the perfect fluid distribution in the scale invariant theory of gravitation, when the space-time described by Einstein-Rosen metric with a time dependent gauge function. The cosmological equations for this space-time with gauge function are solved and some physical properties of the model are studied.
文摘目的了解国外公园绿地服务设计研究热点和趋势,为我国服务设计介入城市公园绿地服务质量改进提供理论指导和建议。方法系统检索Web of Science核心合集数据库、Scopus、Embase、Ebsco、Science Direct、EI Compendex等6个数据库中公园绿地和服务设计相关文献,使用Bicomb软件进行关键词词频统计并构建词篇矩阵和共现矩阵,使用SPSS进行关键词聚类挖掘研究热点并进一步通过多维尺度分析了解热点之间的影响关系、识别潜力节点、探索未来发展趋势。结果共检索相关文献360篇,系统聚类结果表明国外公园绿地服务设计研究围绕公园绿地的环境保护和社会效益、以用户体验为中心的服务设计理论与运用、多元主体视角下公园绿地的包容性与公平性、利益相关者参与的可持续环境共创四大热点议题展开,多维尺度分析结果表明四大议题处于不同研究地位与发展阶段。结论未来公园绿地的服务设计研究应当致力于推动生态系统服务与效益共生、推进服务设计理论顶层设计和实践探索、强化公平性评估与协同设计体系,以及深化跨学科融合与数字化技术介入。
文摘针对低温大空间室内雪乐园因保冷需求与功能特殊性导致的防火分区划分困难、疏散距离超标等火灾防控设计难题,提出“防火单元+动态疏散”的复合设计策略。通过BS 9999:2017 Code of Practice for Fire Safety in the Design,Management and Use of Duildings风险分级理论与火灾荷载控制方法,构建“主分区-防火单元”分级防火体系;结合低温环境下人员密度分层模型与疏散路径优化算法,提出动态疏散优化方案;并通过火灾动力学模拟与人员疏散模拟对设计模型进行多场景验证。试验结果表明,火灾场景下可用安全疏散时间(ASET>1800 s)显著超过必需疏散时间(RSET=408 s),烟气毒性指标(一氧化碳浓度<500 ppm)与能见度(>10 m)均满足安全阈值。研究结果表明,该设计策略在保障人员安全疏散的同时,实现了功能与安全的平衡,为低温大空间建筑消防规范修订与工程实践提供理论支撑。
