3,088 research outputs found
The Devil in the Details: Simple and Effective Optical Flow Synthetic Data Generation
Recent work on dense optical flow has shown significant progress, primarily
in a supervised learning manner requiring a large amount of labeled data. Due
to the expensiveness of obtaining large scale real-world data, computer
graphics are typically leveraged for constructing datasets. However, there is a
common belief that synthetic-to-real domain gaps limit generalization to real
scenes. In this paper, we show that the required characteristics in an optical
flow dataset are rather simple and present a simpler synthetic data generation
method that achieves a certain level of realism with compositions of elementary
operations. With 2D motion-based datasets, we systematically analyze the
simplest yet critical factors for generating synthetic datasets. Furthermore,
we propose a novel method of utilizing occlusion masks in a supervised method
and observe that suppressing gradients on occluded regions serves as a powerful
initial state in the curriculum learning sense. The RAFT network initially
trained on our dataset outperforms the original RAFT on the two most
challenging online benchmarks, MPI Sintel and KITTI 2015
Massless vs. Massive Hawking Radiation in AdS Spacetime
We study massless and massive Hawking radiations on a two-dimensional AdS
spacetime. For the massless case, the quantum stress-energy tensor of a
massless scalar field on the AdS background is calculated, and the expected
null radiation is obtained. However, for the massive case, the scattering
analysis is performed in order to calculate the absorption and reflection
coefficients which are related to statistical Hawking temperature. On the
contrary to the massless case, we obtain a nonvanishing massive radiation.Comment: 13 pages, revtex, to appear in Phys. Lett.
A Large-Scale 3D Face Mesh Video Dataset via Neural Re-parameterized Optimization
We propose NeuFace, a 3D face mesh pseudo annotation method on videos via
neural re-parameterized optimization. Despite the huge progress in 3D face
reconstruction methods, generating reliable 3D face labels for in-the-wild
dynamic videos remains challenging. Using NeuFace optimization, we annotate the
per-view/-frame accurate and consistent face meshes on large-scale face videos,
called the NeuFace-dataset. We investigate how neural re-parameterization helps
to reconstruct image-aligned facial details on 3D meshes via gradient analysis.
By exploiting the naturalness and diversity of 3D faces in our dataset, we
demonstrate the usefulness of our dataset for 3D face-related tasks: improving
the reconstruction accuracy of an existing 3D face reconstruction model and
learning 3D facial motion prior. Code and datasets will be available at
https://neuface-dataset.github.io.Comment: 9 pages, 7 figures, and 3 tables for the main paper. 8 pages, 6
figures and 3 tables for the appendi
Effect of Bisphosphonates on Anodized and Heatâ Treated Titanium Surfaces: An Animal Experimental Study
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141247/1/jper1035.pd
Molecular Detection of Dirofilaria immitis Specific Gene from Infected Dog Blood Sample Using Polymerase Chain Reaction
Background: Dirofilaria immitis, a filarial nematode, is the most important parasite-affecting dogs, causing cardiopulmonary dirofilariasis. Current diagnostic tools for detecting D. immitis include morphological assays, antigen detection, and X-ray. Herein, we developed a method for the molecular detection of D. immitis in blood using polymerase chain reaction (PCR).
Methods: The study was conducted at Eulji University, Republic of Korea in 2016. To detect D. immitis-specific gene regions, we aligned the cytochrome c oxidase subunit I (COI) genes of seven filarial nematodes and designed primers targeting the unique region. We used dog glyceraldehyde-3-phosphate dehydrogenase (GAPDH)-targeted primers as the internal control. We conducted PCR-amplified genomic DNA from canine blood samples. The products were confirmed by sequencing.
Results: Gene alignment revealed a D. immitis COI-specific gene region, and the activity of designed primers was confirmed by PCR and sequencing. Plasmid DNA made from the PCR products was a positive control. The limit of detection for our method was 50 copies. The D. immitis COI and dog GAPDH genes could be discriminated from blood samples simultaneously.
Conclusion: This study provides a method for highly specific and sensitive molecular diagnosis of D. immitis used as a diagnostic and therapeutic tool from the early stage of infection
LaughTalk: Expressive 3D Talking Head Generation with Laughter
Laughter is a unique expression, essential to affirmative social interactions
of humans. Although current 3D talking head generation methods produce
convincing verbal articulations, they often fail to capture the vitality and
subtleties of laughter and smiles despite their importance in social context.
In this paper, we introduce a novel task to generate 3D talking heads capable
of both articulate speech and authentic laughter. Our newly curated dataset
comprises 2D laughing videos paired with pseudo-annotated and human-validated
3D FLAME parameters and vertices. Given our proposed dataset, we present a
strong baseline with a two-stage training scheme: the model first learns to
talk and then acquires the ability to express laughter. Extensive experiments
demonstrate that our method performs favorably compared to existing approaches
in both talking head generation and expressing laughter signals. We further
explore potential applications on top of our proposed method for rigging
realistic avatars.Comment: Accepted to WACV202
Fabrication of double-ceramic-layer TBCs by suspension plasma spray
Rare-earth zirconates, such as La2Zr2O7 and Gd2Zr2O7, have been investigated as one of the candidates for replacing conventional yttria-stabilized zirconia (YSZ) for thermal barrier coating (TBC) applications at higher turbine inlet temperatures. Rare-earth zirconate oxides exhibit little phase transformation upon heating up to melting temperature as well as low thermal conductivity, where as their mechanical properties is inferior to those of YSZ TBCs. Double-ceramic-layer (DCL) TBCs have been investigated in order to take advantage of beneficial characteristics of both YSZ and rare-earth zirconate.
In this study, the fabrication of DCL-TBCs with YSZ layer and rare-earth-zirconate top layer by using suspension plasma spray are reported. Microstructure, compositional profile, thermal conductivity, and thermal durability of DCL-TBCs are characterized. The usefulness of these DCL-TBCs is also discussed
Dark to light! A new strategy for large Stokes shift dyes: coupling of dark donor with tunable high quantum yield acceptors
10.1039/c4sc01821dChemical Science5124812-481
Decay Rate and Low-Energy Near-Horizon Dynamics of Acoustic Black Holes
We study the low-energy dynamics of an acoustic black hole near the sonic
horizon. For the experimental test of black hole evaporation in the laboratory,
the decay rate (greybody factor) of the acoustic black hole (sonic hole) can be
calculated by the usual low-energy perturbation method. As a consequence, we
obtain the decay rate of the sonic horizon from the absorption and the
reflection coefficients. Moreover, we show that the thermal emission from the
sonic horizon is only proportional to a control parameter which describes the
velocity of the fluid.Comment: 13pages, 3figures, RevTeX3, some minors corrected. version to appear
in PL
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