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Taichi: An Open-Source Computer Graphics Library [article]

Yuanming Hu
2018 arXiv   pre-print
Published ones include [Hu and Fang 2017; Hu et al. 2018 ].  ...  Here we summarize our experience during the development of the SIGGRAPH 2018 paper "A Moving Least Squares Material Point Method with Displacement Discontinuity and Two-Way Rigid Body Coupling" [Hu et  ... 
arXiv:1804.09293v1 fatcat:m5giqsxekjdwrpkmnhzu7qlv2q

Exposure

Yuanming Hu, Hao He, Chenxi Xu, Baoyuan Wang, Stephen Lin
2018 ACM Transactions on Graphics  
X:2 • Hu, Y. et al help of software such as Photoshop and Lightroom; however, photo retouching remains challenging for ordinary users who lack the skill to manipulate their images effectively.  ... 
doi:10.1145/3181974 fatcat:s3pf7fdi25hqncvga2gjbfjdzu

Estimation of COVID-19 case fatality ratio based on a bi-directional correction method [article]

Wanling Hu, Xiaoyun Liu, Tao Wang, Changlong Zhou, Dingfu Liu, Yuanming Zhang, Zhongli Hu, Ying Diao
2020 medRxiv   pre-print
According to statistical theory, Hu et al. (2020) used "the 321 minimum coefficient of variation of the daily estimated CFR" as the selection metrics, 322 that is, they used the real-time CFR minimum coefficient  ... 
doi:10.1101/2020.05.02.20089144 fatcat:jqm2g7xrdjhyhkx3x2utw5agsm

Advanced soft robot modeling in ChainQueen

Andrew Spielberg, Tao Du, Yuanming Hu, Daniela Rus, Wojciech Matusik
2021 Robotica (Cambridge. Print)  
Hu, D. Rus and W.  ...  In order to address shortcomings in the space of computational modeling of soft robots, Hu et al. [1] presented ChainQueen, an open-source, fully differentiable soft robot simulator.  ... 
doi:10.1017/s0263574721000722 fatcat:zgtenagcurel5ci26z6qkn4foe

PlasticineLab: A Soft-Body Manipulation Benchmark with Differentiable Physics [article]

Zhiao Huang, Yuanming Hu, Tao Du, Siyuan Zhou, Hao Su, Joshua B. Tenenbaum, Chuang Gan
2021 arXiv   pre-print
Yuanming Hu is partly supported by a Facebook research fellowship and an Adobe research fellowship.  ...  We refer the reader to ChainQueen (Hu et al., 2019b) and DiffTaichi (Hu et al., 2020) for more details on differentiable MPM with elastic materials.  ...  Closely related to our work is ChainQueen (Hu et al., 2019b) , a differentiable simulator for elastic bodies, and DiffTaichi (Hu et al., 2020) , a system to automatically generate high-performance simulation  ... 
arXiv:2104.03311v1 fatcat:tmp23xtv65d5niikoes3bcd22m

Exposure: A White-Box Photo Post-Processing Framework [article]

Yuanming Hu, Hao He, Chenxi Xu, Baoyuan Wang, Stephen Lin
2018 arXiv   pre-print
A detailed explanation of this metric is given in the supplemental document [Hu et al. 2018b ].  ...  Please see our supplemental document [Hu et al. 2018b] for more details about data collection.  ... 
arXiv:1709.09602v2 fatcat:2kx5a34cz5ahbdfbcqdb2o4lwy

Expression and Functional Analysis of Apaf-1 Isoforms

Mary A. Benedict, Yuanming Hu, Naohiro Inohara, Gabriel Núñez
2000 Journal of Biological Chemistry  
Hu and G. Nú ñ ez, unpublished results. FIG. 6. Cytochrome c-dependent binding of Apaf-1 to procaspase-9 requires the extra WD-40 repeat.  ... 
doi:10.1074/jbc.275.12.8461 pmid:10722681 fatcat:ixi34b2tfbfj3fsnzxc3wenury

ChainQueen: A Real-Time Differentiable Physical Simulator for Soft Robotics [article]

Yuanming Hu, Jiancheng Liu, Andrew Spielberg, Joshua B. Tenenbaum, William T. Freeman, Jiajun Wu, Daniela Rus, Wojciech Matusik
2018 arXiv   pre-print
Physical simulators have been widely used in robot planning and control. Among them, differentiable simulators are particularly favored, as they can be incorporated into gradient-based optimization algorithms that are efficient in solving inverse problems such as optimal control and motion planning. Simulating deformable objects is, however, more challenging compared to rigid body dynamics. The underlying physical laws of deformable objects are more complex, and the resulting systems have
more » ... of magnitude more degrees of freedom and therefore they are significantly more computationally expensive to simulate. Computing gradients with respect to physical design or controller parameters is typically even more computationally challenging. In this paper, we propose a real-time, differentiable hybrid Lagrangian-Eulerian physical simulator for deformable objects, ChainQueen, based on the Moving Least Squares Material Point Method (MLS-MPM). MLS-MPM can simulate deformable objects including contact and can be seamlessly incorporated into inference, control and co-design systems. We demonstrate that our simulator achieves high precision in both forward simulation and backward gradient computation. We have successfully employed it in a diverse set of control tasks for soft robots, including problems with nearly 3,000 decision variables.
arXiv:1810.01054v1 fatcat:pnd2a6jk2vbmdgryblf7rvttgq

Nonconvex and Nonsmooth Sparse Optimization via Adaptively Iterative Reweighted Methods [article]

Hao Wang, Fan Zhang, Yuanming Shi, Yaohua Hu
2021 arXiv   pre-print
We propose a general formulation of nonconvex and nonsmooth sparse optimization problems with convex set constraint, which can take into account most existing types of nonconvex sparsity-inducing terms, bringing strong applicability to a wide range of applications. We design a general algorithmic framework of iteratively reweighted algorithms for solving the proposed nonconvex and nonsmooth sparse optimization problems, which solves a sequence of weighted convex regularization problems with
more » ... tively updated weights. First-order optimality condition is derived and global convergence results are provided under loose assumptions, making our theoretical results a practical tool for analyzing a family of various reweighted algorithms. The effectiveness and efficiency of our proposed formulation and the algorithms are demonstrated in numerical experiments on various sparse optimization problems.
arXiv:1810.10167v2 fatcat:aft4oqd4bjcrpkmq5qbhdaob6i

Analysis of diffraction imaging in non-conjugate configurations

Ran Pan, Yuanming Feng, Yu Sa, Jun Q. Lu, Kenneth M. Jacobs, Xin-Hua Hu
2014 Optics Express  
Diffraction imaging of scattered light allows extraction of information on scatterer's morphology. We present a method for accurate simulation of diffraction imaging of single particles by combining rigorous light scattering model with ray-tracing software. The new method has been validated by comparison to measured images of single microspheres. Dependence of fringe patterns on translation of an objective based imager to off-focus positions has been analyzed to clearly understand diffraction
more » ... aging with multiple optical elements. The calculated and measured results establish unambiguously that diffraction imaging should be pursued in non-conjugate configurations to ensure accurate sampling of coherent light distribution from the scatterer.
doi:10.1364/oe.22.031568 pmid:25607106 fatcat:ndkauvg55rdz5cwupu3cg3srfq

A NOVEL 3d TRANSITION-METAL ALCOCRCUTI HIGH-ENTROPY ALLOY

Menglan Shen, Yuanming Huo, Tao He, Yong Xue, Yujia Hu, Wanbo Yang
2021 Materiali in Tehnologije  
The phase component, microstructure and compressive properties of a novel 3d transition metal high entropy alloy, AlCoCrCuTi, in as-cast and annealed conditions were investigated. The phases of the as-cast AlCoCrCuTi alloy are composed of primary phase AlCo2Ti (L21), eutectic structure {AlCo2Ti (L21)+ Al3Cr7 (BCC)} and interdendritic phase AlCu2Ti (L21). Through annealing, a rosette feature of the as-cast AlCo2Ti + Al3Cr7 eutectic structure is deteriorated due to the lath-like Al3Cr7 changed to
more » ... finely-divided one. In mechanics performance, the as-cast alloy exhibits a balanced synergy in hardness (593±37 HV) and ultimate strength (745 MPa), while the hardness of the annealed alloy slightly increases to 647±23 HV at the expense of the ultimate strength. Moreover, the alloy either in as-cast or annealed conditions unfortunately display a typically brittle character. The deficiency of elongation might stem from the diversified brittle and hard phases incorporated, such as AlCo2Ti + Al3Cr7.
doi:10.17222/mit.2021.013 fatcat:3dz77rypmjaz5hdcqfxh5aanji

Alterations in White Matter Integrity in Young Adults with Smartphone Dependence

Yuanming Hu, Xiaojing Long, Hanqing Lyu, Yangyang Zhou, Jianxiang Chen
2017 Frontiers in Human Neuroscience  
Copyright © 2017 Hu, Long, Lyu, Zhou and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).  ... 
doi:10.3389/fnhum.2017.00532 pmid:29163108 pmcid:PMC5673664 fatcat:5334pimpbjgqjk4ai63qvjk3ly

FC^4: Fully Convolutional Color Constancy with Confidence-Weighted Pooling

Yuanming Hu, Baoyuan Wang, Stephen Lin
2017 2017 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)  
Hu was an intern at Microsoft Research.  ...  State-of-the-art techniques [38, 6, 7, 31, 5] have harnessed the power of convolutional neural networks (CNNs) to learn color constancy models from large training sets, * This work was done when Yuanming  ... 
doi:10.1109/cvpr.2017.43 dblp:conf/cvpr/HuWL17 fatcat:67m4wc5azngtrhpgky7pggbx74

Rapid and Variable-Volume Sampling Loading in Nonaqueous Microchip Electrophoresis

Zhenhua Li, Yuanming Guo, Yongdong Zhou, Xiaoning Zhang, Hongmei Hu
2014 Journal of the Brazilian Chemical Society  
Um esquema rápido e de volume variável de carregamento de amostras para eletroforese nãoaquosa em microchip com fluorescência induzida a laser (NAMCE-LIF) foi desenvolvido, incluindo um plugue de polímero poroso, uma bomba de microvácuo de baixo custo e uma fonte de alta tensão com potencial único. O plugue de polímero poroso foi fabricado dentro do canal de separação como uma válvula de seleção, que impedia o tampão de corrida do reservatório de descarte de tampão (BW) de fluir de volta ao
more » ... l de separação, mas permitia a migração eletroforética ao longo do canal de separação. Aplicando uma pressão subatmosférica ao headspace do reservatório de descarte (SW), amostra e tampão de corrida eram passados imediatamente ao SW. Concomitantemente, uma parte do fluxo de amostra era conduzido através do plugue de polímero poroso pela força elétrica, formando uma zona de amostra no canal de separação. O comprimento da zona de amostra injetada era proporcional ao tempo de injeção. O método proposto foi aplicado com sucesso na separação de Rodamina 123 (Rh123) e Rodamina 6G (Rh6G). Os limites de detecção para Rh123 e Rh6G baseados em S/N = 3 foram 0,63 e 0,48 nmol L -1 , respectivamente. O sistema provou possuir um potencial para aperfeiçoamento de rendimento, repetibilidade, sensibilidade, desempenho da separação da eletroforese não aquosa em microchip e uma ampla gama de aplicações. A rapid and variable-volume sample loading scheme for nonaqueous microchip electrophoresis with laser induced fluorescence detection (NAMCE-LIF) was developed, which included a porous polymer plug, a low-cost microvacuum pump, and a single potential supply. The porous polymer plug was fabricated within the separation channel as a select valve, which prevented the running buffer from buffer waste reservoir (BW) flowing back into the separation channel, but allowed electrophoretic migration along the separation channel. By applying a subatmospheric pressure to the headspace of sample waste reservoir (SW), sample and running buffer were drawn immediately to SW. At the same time, a branch of the sample stream was driven across the porous polymer plug by the electric force and formed a sample zone in the separation channel. The injected sample zone length was in proportion with the injection time. The proposed method was successfully applied to separation of Rhodamine 123 (Rh123) and Rhodamine 6G (Rh6G). The limits of detection for Rh123 and Rh6G based on S/N = 3 were 0.63 and 0.48 nmol L -1 , respectively. The system has been proved to possess an exciting potential for improving throughput, repeatability, sensitivity, separation performance of nonaqueous microchip electrophoresis and a wide range of applications.
doi:10.5935/0103-5053.20140038 fatcat:gbj5gynjyrgt3ikkdmeuwwq4oi

DiffTaichi: Differentiable Programming for Physical Simulation [article]

Yuanming Hu, Luke Anderson, Tzu-Mao Li, Qi Sun, Nathan Carr, Jonathan Ragan-Kelley, Frédo Durand
2020 arXiv   pre-print
For more details, readers are referred to Hu et al. (2019a) .  ...  We follow ChainQueen's implementation (Hu et al., 2019b) and use the moving least squares material point method (Hu et al., 2018 ) to simulate the system.  ... 
arXiv:1910.00935v3 fatcat:eesc7eajwre2dgukd7m2ag4v4a
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