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RISS 인기검색어
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- 저자 : Yifeng Zhu (검색결과 5 건)
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SuperDepthTransfer: Depth Extraction from Image Using Instance-Based Learning with Superpixels
( Yuesheng Zhu ),( Yifeng Jiang ),( Zhuandi Huang ),( Guibo Luo ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.10
In this paper, we primarily address the difficulty of automatic generation of a plausible depth map from a single image in an unstructured environment. The aim is to extrapolate a depth map with a more correct, rich, and distinct depth order, which is both quantitatively accurate as well as visually pleasing. Our technique, which is fundamentally based on a preexisting DepthTransfer algorithm, transfers depth information at the level of superpixels. This occurs within a framework that replaces a pixel basis with one of instance-based learning. A vital superpixels feature enhancing matching precision is posterior incorporation of predictive semantic labels into the depth extraction procedure. Finally, a modified Cross Bilateral Filter is leveraged to augment the final depth field. For training and evaluation, experiments were conducted using the Make3D Range Image Dataset and vividly demonstrate that this depth estimation method outperforms state-of-the-art methods for the correlation coefficient metric, mean log10 error and root mean squared error, and achieves comparable performance for the average relative error metric in both efficacy and computational efficiency. This approach can be utilized to automatically convert 2D images into stereo for 3D visualization, producing anaglyph images that are visually superior in realism and simultaneously more immersive.
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Qingjie Zhang,Yifeng Niu,Lin Wang,Lincheng Shen,Huayong Zhu 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.6
The average consensus problem of high-order multi-agent systems with multiple time-varying communication delays is investigated in this paper. By using the idea of state decomposition, the condition for guaranteeing average consensus is converted into verifying the stability of zero equi-librium of disagreement system. Considering multiple time-varying communication delays, Lyapunov-Krasovskii approach in time-domain is employed to analyze the stability of zero equilibrium. With the help of Free-weighting Matrices (FWM) approach, the tolerant upper bounds on communication delays can be obtained through solving feasible linear matrix inequalities (LMIs). Delay-dependent stability criteria for both strongly-connected fixed and switching topologies are provided in the main results. Further, the conclusion is extended to the case of jointly-connected switching topologies. Numerical examples and simulation results are given to demonstrate the effectiveness and the benefit on reducing conservativeness of the proposed method.
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Jianguo Cai,Yuhang Zhou,Yifeng Zhu,Yixiang Xu,Jin Zhang 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.3
In this paper, the kinematic characteristic of the radially retractable roof structure was firstly discussed and the motion boundary of the system was also studied. The results show that the diameter of the outer boundary of the system increases firstly and then decreases when the roof is open. Moreover, the numerical study of the structural behavior of the retractable roof with radial foldable bars and circumferential foldable bars was carried out, respectively. It can be found the latter one has a better structural behavior. Then the mechanical behaivor of the system during the motion was also investigated. Finally, a loop linkage based on a special scissor-like element was proposed to support the retractable roof.
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On Block-decoupling of Boolean Control Networks
Lei Wang,Jiandong Zhu,Yifeng Li 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.1
In this paper, two block-decoupling problems of Boolean control networks (BCNs), one of which is related to system decomposition and the other is not, are investigated by using the method of the semi-tensor product of matrices. Necessary and sufficient graphic conditions for block-decoupling of BCNs in the two cases are obtained. Moreover, a logical coordinate transformation is constructed to achieve block-decoupling related to system decomposition when the corresponding graphic conditions are satisfied. Finally, two illustrative examples are provided to illustrate the theoretical results.
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Static performance of a new GFRP–metal string truss bridge subjected to unsymmetrical loads
Dongdong Zhang,Jiaxin Yuan,Qilin Zhao,Feng Li,Yifeng Gao,Ruijie Zhu,Zhiqin Zhao 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.5
A unique lightweight string truss deployable bridge assembled by thin-walled fiber reinforced polymer (FRP) and metal profiles was designed for emergency applications. As a new structure, investigations into the static structural performance under the serviceability limit state are desired for examining the structural integrity of the developed bridge when subjected to unsymmetrical loadings characterized by combined torsion and bending. In this study, a full-scale experimental inspection was conducted on a fabricated bridge, and the combined flexural–torsional behavior was examined in terms of displacement and strains. The experimental structure showed favorable strength and rigidity performances to function as deployable bridge under unsymmetrical loading conditions and should be designed in accordance with the stiffness criterion, the same as that under symmetrical loads. In addition, a finite element model (FEM) with a simple modeling process, which considered the multi segments of the FRP members and realistic nodal stiffness of the complex unique hybrid nodal joints, was constructed and compared against experiments, demonstrating good agreement. A FEM-based numerical analysis was thereafter performed to explore the effect of the change in elastic modulus of different FRP elements on the static deformation of the bridge. The results confirmed that the change in elastic modulus of different types of FRP element members caused remarkable differences on the bending and torsional stiffness of the hybrid bridge. The global stiffness of such a unique bridge can be significantly enhanced by redesigning the critical lower string pull bars using designable FRP profiles with high elastic modulus.
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