Search scope:
排序: Display mode:
Block coordinate descent with time perturbation for nonconvex nonsmooth problems in real-world studies Research Article
Rui Liu, Wei-chu Sun, Tao Hou, Chun-hong Hu, Lin-bo Qiao,liuruirui@csu.edu.cn,smsysun@foxmail.com,houtao@csu.edu.cn,huchunhong@csu.edu.cn,qiao.linbo@nudt.edu.cn
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10, Pages 1390-1403 doi: 10.1631/FITEE.1900341
Keywords: 收敛分析;异步块坐标下降法;时间扰动;非凸非平滑优化;真实世界研究
HAM: a deep collaborative ranking method incorporating textual information Research Articles
Cheng-wei Wang, Teng-fei Zhou, Chen Chen, Tian-lei Hu, Gang Chen,rr@zju.edu.cn,zhoutengfei@zju.edu.cn,cc33@zju.edu.cn,htl@zju.edu.cn,cg@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 8, Pages 1119-1266 doi: 10.1631/FITEE.1900382
Keywords: 深度学习;推荐系统;高速公路网络;块坐标梯度下降
A descent method for the Dubins traveling salesman problem with neighborhoods Research Articles
Zheng Chen, Chen-hao Sun, Xue-ming Shao, Wen-jie Zhao,z_chen@zju.edu.cn,mecsxm@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5, Pages 615-766 doi: 10.1631/FITEE.2000041
Keywords: Dubins飞行器;坐标下降法;Dubins旅行商问题
Improved Matching Algorithms for Linear Face Class Model
Fu Yun,Zheng Nanning
Strategic Study of CAE 2005, Volume 7, Issue 2, Pages 47-56
An advanced matching technique for linear face class model is proposed, which can solve the problem of detailed controlling and robust iteration for the realistic facial modeling. A new method——Dynamic Gaussian Pyramid Analysis (DGPA), which combines Non-Uniform Sampling (NUS) method and Multi-Resolution Analysis, is presented. Integrating the PS Sampling and the Cluster Random Sampling, the distribution of the sampled points in each level images of the Gaussian pyramid is adjusted dynamically. In coarse-to-fine scheme, the minimization algorithm is used to compute the near global optimal solution that may fit to yield accurate model matching. Dynamic adjusting the boundary of the sampling cluster area and the resampling ratio, the detailed representations are effectively controlled, and the model creation is quite robust. An improved Stochastic Gradient Descent (SGD) algorithm based on the Correlative Disturbance (CD) and Adaptive Learning Rate (ALR) is exploited to accelerate iteration convergence and compute valid model parameters. With the examples of MPI Caucasian Face and AI&R Asian Face databases, experimental results in subjective evaluation and objective evaluation demonstrate the advanced model matching technique.
Keywords: facial modeling model matching stochastic gradient descent non-uniform sampling multiresolution analysis
Application of Satellite Gravity Gradiometry Data to the Refinement of the Earth’s Gravity Field
Ning Jinsheng,Luo Zhicai,Chen Yongqi
Strategic Study of CAE 2002, Volume 4, Issue 7, Pages 23-28
In recent times, one of the primary scientific objectives of physical geodesy is to determine the geoid with centimeter level and to develop the ultra high global earth’s gravity field model,and for this purpose satellite gravity gradiometry is one of the most promising techniques. This paper first comments on the main progress of satellite gravity gradiometry, and then discusses some theories and methods for refining the earth´s gravity field using satellite gravity gradiometry data.
Keywords: satellite gravity gradiometry satellite gravity gradiometry boundary value problem earth's gravity field model geoid
Study on Down Knock-in Renewal Option Pricing
Wu Yun,He Jianmin
Strategic Study of CAE 2004, Volume 6, Issue 12, Pages 47-50
In this paper, firstly, the basic connotation of modern leasing and the basic principle of real option are dissertated. Then, the down knock-in renewal option pricing model and its solution are put forward. At last, example is provided.
Keywords: leasing renewal leasing option real option down knock-in option
Wu Xiugang,Shen Yongming,Zheng Yonghong,Yang Zhifeng
Strategic Study of CAE 2003, Volume 5, Issue 2, Pages 57-61
Based on depth-averaged mathematic model of flow and pollutant transportation in non-orthogonal curvilinear coordinates, the k-ε double equations´ turbulence model and the coupling arithmetic of velocity-water depth are adopted, which are applied to the numerical simulation of the flow and the contamination diffusion-transportation. The flow field and concentration of discharge both along bank and in the centerline of the meandering channel in laboratory are calculated, and the calculating results accord well with the measured data.
Keywords: curvilinear coordinates meandering channel diffusion-transportation IMPLEC algorithm concentration field
Zhang Qiang,Lu Lipeng
Strategic Study of CAE 2003, Volume 5, Issue 11, Pages 47-50
The evolution of coherent structures in the wall region of a turbulent boundary layer under adverse pressure gradients was studied by using DNS method. The motions of the second and the fourth quadrant were analyzed. The results show that to the shear stress, the contribution of sweep motions is stronger than that of ejections under adverse pressure gradient. And the sweeps contribute to the transport of shear-stress and kinetic energy of turbulence more strongly than the ejections under adverse pressure gradient.
Keywords: coherent structures turbulent boundary layer adverse pressure gradients direct numerical simulation
Fractional-order global optimal backpropagation machine trained by an improved fractional-order steepest descent method Research Articles
Yi-fei Pu, Jian Wang,puyifei@scu.edu.cn,wangjiannl@upc.edu.cn
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6, Pages 809-962 doi: 10.1631/FITEE.1900593
Reinforcement design of anchor blocks for external tendons
Hong Hao,Tong Yuqiang ,He Zhiqi,Liu Zhao
Strategic Study of CAE 2013, Volume 15, Issue 8, Pages 95-98
Reinforced blocks are common anchorage forms for external tendons. However, there was no mature design method. Through finite element analysis, the paper revealed that the tensile stress concentration was caused by three typical local actions. On this basis, three equations for calculating resultant forces of these local actions were formulated. Thus a quantitative reinforcement design method of anchor blocks was proposed. Finally, an anchor block of the Fourth Nanjing Yangtze River Bridge was presented as a design example to demonstrate the effectiveness and convenience of the proposed method.
Keywords: anchor block external prestressing reinforcement design bursting force cantilever action tie-back
The Nanoscale Density Gradient as a Structural Stabilizer for Glass Formation Article
Shaoxiong Zhou, Bangshao Dong, Yanguo Wang, Jingyu Qin, Weihua Wang
Engineering 2023, Volume 29, Issue 10, Pages 120-129 doi: 10.1016/j.eng.2023.01.010
The rapid cooling of a metallic liquid (ML) results in short-range order (SRO) among the atomic arrangements and a disordered structure in the resulting metallic glass (MG). These phenomena cause various possible features in the microscopic structure of the MG, presenting a puzzle about the nature of the MGs' microscopic structure beyond SRO. In this study, the nanoscale density gradient (NDG) originating from a sequential arrangement of clusters with different atomic packing densities (APDs), representing the medium-range structural heterogeneity in Zr60Cu30Al10 MG, was characterized using electron tomography (ET) combined with image simulations based on structure modeling. The coarse polyhedrons with distinct facets identified in the three-dimensional images coincide with icosahedron-like clusters and represent the spatial positions of clusters with high APDs. Rearrangements of the different clusters according to descending APD order in the glass-forming process are responsible for the NDG that stabilizes both the supercooled ML and the amorphous states and acts as a hidden rule in the transition from ML to MG.
Keywords: Rapid cooling Amorphous solid Density gradient Electron tomography Atomic clusters
A Weighted Block-matching Criterion for the Hardware Implementation of Motion Estimators
Zhang Xia,Zheng Nanning,Zhang Guanglie,Wu Yong,Wang Shaorui,Xu Weipu
Strategic Study of CAE 2002, Volume 4, Issue 1, Pages 47-53
In all kinds of digital video processing algorithms, motion compensated algorithm can acquire perfect performance because the motion information in the video signal has been considered. The hardware implementation of the motion estimator is the core of the various motion compensated digital video processings, which will be applied in real systems. Block-matching motion estimating algorithm is widely used in real system because of its low computing complication, easy realization and high call frequency of the block-matching criterion in the hardware systems. A new criterion called weighted minimized maximum error is proposed in this paper. This criterion can reduce the complexity of the motion estimator, decrease the area of the hardware and increase the speed of the hardware. On the other hand, the criterion is suitable to be applied to the recursive searching strategy which has an inherent weakness called error propagation.
Keywords: video processing motion compensation motion estimation block-matching criterion
Survey on Extraction Methods of Transition Region
Liu Suolan,Yang Jingyu
Strategic Study of CAE 2007, Volume 9, Issue 9, Pages 89-96
Image segmentation is treated as a key issue in image processing and machine vision, and has been the bottleneck of development. Transition region is a special region located between the object and background. Having the aid of extraction of transition region to segment image is a kind of burgeoning technology. Two kinds of methods have been introduced: methods based on gradient and methods based on non-gradient. Briefly, the extracted effects and existent problem have been analyzed.
Keywords: transition region extraction image segmentation gradient method non-gradient method
Quantifying multiple social relationships based on a multiplex stochastic block model Science Letter
Mincheng Wu, Zhen Li, Cunqi Shao, Shibo He,s18he@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 11, Pages 1458-1462 doi: 10.1631/FITEE.2000617
Keywords: 社交网络;多重网络;随机块模型
A distributed stochastic optimization algorithm with gradient-tracking and distributed heavy-ball acceleration Research Articles
Bihao Sun, Jinhui Hu, Dawen Xia, Huaqing Li,huaqingli@swu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 11, Pages 1463-1476 doi: 10.1631/FITEE.2000615
Keywords: 分布式优化;高性能算法;多智能体系统;机器学习问题;随机梯度
Title Author Date Type Operation
Block coordinate descent with time perturbation for nonconvex nonsmooth problems in real-world studies
Rui Liu, Wei-chu Sun, Tao Hou, Chun-hong Hu, Lin-bo Qiao,liuruirui@csu.edu.cn,smsysun@foxmail.com,houtao@csu.edu.cn,huchunhong@csu.edu.cn,qiao.linbo@nudt.edu.cn
Journal Article
HAM: a deep collaborative ranking method incorporating textual information
Cheng-wei Wang, Teng-fei Zhou, Chen Chen, Tian-lei Hu, Gang Chen,rr@zju.edu.cn,zhoutengfei@zju.edu.cn,cc33@zju.edu.cn,htl@zju.edu.cn,cg@zju.edu.cn
Journal Article
A descent method for the Dubins traveling salesman problem with neighborhoods
Zheng Chen, Chen-hao Sun, Xue-ming Shao, Wen-jie Zhao,z_chen@zju.edu.cn,mecsxm@zju.edu.cn
Journal Article
Application of Satellite Gravity Gradiometry Data to the Refinement of the Earth’s Gravity Field
Ning Jinsheng,Luo Zhicai,Chen Yongqi
Journal Article
Numerical Computation of Flow and Pollutant Diffusion - Transportation With Non-orthogonal Curvilinear Coordinates
Wu Xiugang,Shen Yongming,Zheng Yonghong,Yang Zhifeng
Journal Article
The Ejection and Sweep in the Wall Region of a Turbulent Boundary Layer Under Adverse Pressure Gradient
Zhang Qiang,Lu Lipeng
Journal Article
Fractional-order global optimal backpropagation machine trained by an improved fractional-order steepest descent method
Yi-fei Pu, Jian Wang,puyifei@scu.edu.cn,wangjiannl@upc.edu.cn
Journal Article
Reinforcement design of anchor blocks for external tendons
Hong Hao,Tong Yuqiang ,He Zhiqi,Liu Zhao
Journal Article
The Nanoscale Density Gradient as a Structural Stabilizer for Glass Formation
Shaoxiong Zhou, Bangshao Dong, Yanguo Wang, Jingyu Qin, Weihua Wang
Journal Article
A Weighted Block-matching Criterion for the Hardware Implementation of Motion Estimators
Zhang Xia,Zheng Nanning,Zhang Guanglie,Wu Yong,Wang Shaorui,Xu Weipu
Journal Article
Quantifying multiple social relationships based on a multiplex stochastic block model
Mincheng Wu, Zhen Li, Cunqi Shao, Shibo He,s18he@zju.edu.cn
Journal Article