1,791 research outputs found
Repulsion Loss: Detecting Pedestrians in a Crowd
Detecting individual pedestrians in a crowd remains a challenging problem
since the pedestrians often gather together and occlude each other in
real-world scenarios. In this paper, we first explore how a state-of-the-art
pedestrian detector is harmed by crowd occlusion via experimentation, providing
insights into the crowd occlusion problem. Then, we propose a novel bounding
box regression loss specifically designed for crowd scenes, termed repulsion
loss. This loss is driven by two motivations: the attraction by target, and the
repulsion by other surrounding objects. The repulsion term prevents the
proposal from shifting to surrounding objects thus leading to more crowd-robust
localization. Our detector trained by repulsion loss outperforms all the
state-of-the-art methods with a significant improvement in occlusion cases.Comment: Accepted to IEEE Conference on Computer Vision and Pattern
Recognition (CVPR) 201
Aseismic Study on Mountain Tunnels in High-Intensity Seismic Area
The chapter discusses the antiseismic and shock absorption study on the mountain tunnels in high-seismic intensity areas using numerical analysis and shaking table test for recent years and proposes the seismic challenges of tunnel design in Sichuan-Tibet Railway. The aseismic design of the tunnel entrance and the inner part in the fracture zone are presented according to the previous research results
Manipulation of magnetic topological textures via perpendicular strain and polarization in van der Waals magnetoelectric heterostructure
Multi-functional manipulation of magnetic topological textures such as
skyrmions and bimerons in energy-efficient ways is of great importance for
spintronic applications, but still being a big challenge. Here, by
first-principles calculations and atomistic simulations, the creation and
annihilation of skyrmions/bimerons, as key operations for the reading and
writing of information in spintronic devices, are achieved in van der Waals
magnetoelectric CrISe/In2Se3 heterostructure via perpendicular strain or
electric field without external magnetic field. Besides, the bimeron-skyrmion
conversion, size modulation and the reversible magnetization switching from
in-plane to out-of-plane could also be realized in magnetic-field-free ways.
Moreover, the topological charge and morphology can be precisely controlled by
a small magnetic field. The strong Dzyaloshinskii-Moriya interaction and
tunable magnetic anisotropy energy in a wide window are found to play vital
roles in such energy efficient multi-functional manipulation, and the
underlying physical mechanisms are elucidated. Our work predicts the
CrISe/In2Se3 heterostructure being an ideal platform to address this challenge
in spintronic applications, and theoretically guides the low-dissipation
multi-functional manipulation of magnetic topological textures.Comment: 7 pages, 5 figure
Enhanced thermopower in an intergrowth cobalt oxide LiNaCoO
We report the measurements of thermopower, electrical resistivity and thermal
conductivity in a complex cobalt oxide LiNaCoO, whose
crystal structure can be viewed as an intergrowth of the O3 phase of
LiCoO and the P2 phase of NaCoO along the c axis. The
compound shows large room-temperature thermopower of 180 V/K, which
is substantially higher than those of LiCoO and NaCoO.
The figure of merit for the polycrystalline sample increases rapidly with
increasing temperature, and it achieves nearly 10 K at 300 K,
suggesting that LiNaCoO system is a promising candidate for
thermoelectric applications.Comment: Submitted to AP
Grain setting defect1 (GSD1) function in rice depends on S-acylation and interacts with actin 1 (OsACT1) at its C-terminal
Grain setting defect1 (GSD1), a plant-specific remorin protein specifically localized at the plasma membrane and plasmodesmata of phloem companion cells, affects grain setting in rice through regulating the transport of photoassimilates. Here, we show new evidence demonstrating that GSD1 is localized at the cytoplasmic face of the plasma membrane and a stretch of 45 amino acid residues at its C-terminal is required for its localization. Association with the plasma membrane is mediated by S-acylation of cysteine residues Cys-524 and Cys-527, in a sequence of 45 amino acid residues essential for GSD1 function in rice. Furthermore, the coiled-coil domain in GSD1 is necessary for sufficient interaction with OsACT1. Together, these results reveal that GSD1 attaches to the plasma membrane through S-acylation and interacts with OsACT1 through its coiled-coil domain structure to regulate plasmodesmata conductance for photoassimilate transport in rice
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