231 research outputs found
Highly Efficient Regression for Scalable Person Re-Identification
Existing person re-identification models are poor for scaling up to large
data required in real-world applications due to: (1) Complexity: They employ
complex models for optimal performance resulting in high computational cost for
training at a large scale; (2) Inadaptability: Once trained, they are
unsuitable for incremental update to incorporate any new data available. This
work proposes a truly scalable solution to re-id by addressing both problems.
Specifically, a Highly Efficient Regression (HER) model is formulated by
embedding the Fisher's criterion to a ridge regression model for very fast
re-id model learning with scalable memory/storage usage. Importantly, this new
HER model supports faster than real-time incremental model updates therefore
making real-time active learning feasible in re-id with human-in-the-loop.
Extensive experiments show that such a simple and fast model not only
outperforms notably the state-of-the-art re-id methods, but also is more
scalable to large data with additional benefits to active learning for reducing
human labelling effort in re-id deployment
FPS-SFT: A Multi-dimensional Sparse Fourier Transform Based on the Fourier Projection-slice Theorem
We propose a multi-dimensional (M-D) sparse Fourier transform inspired by the
idea of the Fourier projection-slice theorem, called FPS-SFT. FPS-SFT extracts
samples along lines (1-dimensional slices from an M-D data cube), which are
parameterized by random slopes and offsets. The discrete Fourier transform
(DFT) along those lines represents projections of M-D DFT of the M-D data onto
those lines. The M-D sinusoids that are contained in the signal can be
reconstructed from the DFT along lines with a low sample and computational
complexity provided that the signal is sparse in the frequency domain and the
lines are appropriately designed. The performance of FPS-SFT is demonstrated
both theoretically and numerically. A sparse image reconstruction application
is illustrated, which shows the capability of the FPS-SFT in solving practical
problems
Tensor Discriminant Analysis for View-based Object Recognition
In this paper, we use a general M th order tensor dis-criminant analysis approach [11] for view based object recognition. This method is an extension of the 2D im-age coding technique [10] to general M th order tensors for discriminant analysis, and has good convergence prop-erty. We demonstrate the performance advantages of this approach over existing techniques using experiments on the COIL-100 and the ETH-80 datasets. Specifically, our ex-perimental results on ETH-80 show the particular strength of this tensor discriminant analysis method when only a small number of training samples with big intra-class vari-ation are available. 1
Imaging molecular orbitals with laser-induced electron tunneling spectroscopy
Photoelectron spectroscopy in intense laser fields has proven to be a
powerful tool for providing detailed insights into molecular structure. The
ionizing molecular orbital, however, has not been reconstructed from the
photoelectron spectra, mainly due to the fact that its phase information can be
hardly extracted. In this work, we propose a method to retrieve the phase
information of the ionizing molecular orbital with laser-induced electron
tunneling spectroscopy. By analyzing the interference pattern in the
photoelectron spectrum, the weighted coefficients and the relative phases of
the constituent atomic orbitals for a molecular orbital can be extracted. With
this information we reconstruct the highest occupied molecular orbital of
N. Our work provides a reliable and general approach for imaging of
molecular orbitals with the photoelectron spectroscopy.Comment: 6 pages, 4 figures, including Supplementary Material
Understanding the tribological impacts of alkali element on lubrication of binary borate melt
Melt lubricants have been regarded as an effective class to deliver lubrication on moving mechanical contacts at extreme temperatures. Among the elementary constituents, alkali elements play a critical role in governing the physical-chemical characteristics of the lubricant despite the obscurity regarding their intrinsic roles on the rubbing interfaces. The present study attempts to unfold the effects of sodium on the tribological responses of mating steel pair under borate melt lubrication. It has been found that the involvement of Na inspires a total reversal in lubricating potentials of the lone B2O3melt manifested by remarkable friction reduction, wear inhibition and prolonged load-bearing capacity. These exceptional performances are attributed to the accretion of nanothin Na layers on the contact interfaces. The interfacial occurrences are interpreted from a physico-chemistry perspective while the influences of surface microstructure are also discussed in detail. Multiple characterizations are employed to thoroughly examine the sliding interfaces in multi-dimensions including Scanning Electron Microscopy (SEM), Scanning Transmission Electron Microscopy (STEM) and Atomic Force Microscopy (AFM). In addition, chemical fingerprints of relevant elements are determined by Energy Dispersive Spectroscopy (EDS) and Electron Loss Energy Spectroscopy (EELS)
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