251 research outputs found
Real-time optical intensity correlation using photorefractive BSO
Available from British Library Document Supply Centre- DSC:DX187344 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
Cardiovascular magnetic resonance of quinticuspid aortic valve with aortic regurgitation and dilated ascending aorta
We report a rare case of a quinticuspid aortic valve associated with regurgitation and dilation of the ascending aorta, which was diagnosed and post-surgically followed up by cardiovascular magnetic resonance and dual source computed tomography
XVTP3D: Cross-view Trajectory Prediction Using Shared 3D Queries for Autonomous Driving
Trajectory prediction with uncertainty is a critical and challenging task for
autonomous driving. Nowadays, we can easily access sensor data represented in
multiple views. However, cross-view consistency has not been evaluated by the
existing models, which might lead to divergences between the multimodal
predictions from different views. It is not practical and effective when the
network does not comprehend the 3D scene, which could cause the downstream
module in a dilemma. Instead, we predicts multimodal trajectories while
maintaining cross-view consistency. We presented a cross-view trajectory
prediction method using shared 3D Queries (XVTP3D). We employ a set of 3D
queries shared across views to generate multi-goals that are cross-view
consistent. We also proposed a random mask method and coarse-to-fine
cross-attention to capture robust cross-view features. As far as we know, this
is the first work that introduces the outstanding top-down paradigm in BEV
detection field to a trajectory prediction problem. The results of experiments
on two publicly available datasets show that XVTP3D achieved state-of-the-art
performance with consistent cross-view predictions.Comment: 11 pages, 6 figures, accepted by IJCAI 2
Photo-Otto engine with quantum correlations
We theoretically prose and investigate a photo-Otto engine that is working
with a single-mode radiation field inside an optical cavity and alternatively
driven by a hot and a cold reservoir, where the hot reservoir is realized by
sending one of a pair of correlated two-level atoms to pass through the optical
cavity, and the cold one is made of a collection of noninteracting boson modes.
In terms of the quantum discord of the pair of atoms, we derive the analytical
expressions for the performance parameters (power and efficiency) and stability
measure (coefficient of variation for power). We show that quantum discord
boosts the performance and efficiency of the quantum engine, and even may
change the operation mode. We also demonstrate that quantum discord improves
the stability of machine by decreasing the coefficient of variation for power
which satisfies the generalized thermodynamic uncertainty relation. Finally, we
find that these results can be transferred to another photo-Otto engine model,
where the optical cavity is alternatively coupled to a hot thermal bosonic bath
and to a beam of pairs of the two correlated atoms that play the role of a cold
reservoir
Uncertainty Relations Based on Modified Wigner-Yanase-Dyson Skew Information
Uncertainty relation is a core issue in quantum mechanics and quantum
information theory. We introduce modified generalized Wigner-Yanase-Dyson
(MGWYD) skew information and modified weighted generalizedWigner-Yanase-Dyson
(MWGWYD) skew information, and establish new uncertainty relations in terms of
the MGWYD skew information and MWGWYD skew information.Comment: 16 page
Simulation assisted machine learning
Motivation: In a predictive modeling setting, if sufficient details of the
system behavior are known, one can build and use a simulation for making
predictions. When sufficient system details are not known, one typically turns
to machine learning, which builds a black-box model of the system using a large
dataset of input sample features and outputs. We consider a setting which is
between these two extremes: some details of the system mechanics are known but
not enough for creating simulations that can be used to make high quality
predictions. In this context we propose using approximate simulations to build
a kernel for use in kernelized machine learning methods, such as support vector
machines. The results of multiple simulations (under various uncertainty
scenarios) are used to compute similarity measures between every pair of
samples: sample pairs are given a high similarity score if they behave
similarly under a wide range of simulation parameters. These similarity values,
rather than the original high dimensional feature data, are used to build the
kernel.
Results: We demonstrate and explore the simulation based kernel (SimKern)
concept using four synthetic complex systems--three biologically inspired
models and one network flow optimization model. We show that, when the number
of training samples is small compared to the number of features, the SimKern
approach dominates over no-prior-knowledge methods. This approach should be
applicable in all disciplines where predictive models are sought and
informative yet approximate simulations are available.
Availability: The Python SimKern software, the demonstration models (in
MATLAB, R), and the datasets are available at
https://github.com/davidcraft/SimKern.Comment: This manuscript has been accepted for publication in Bioinformatics
published by Oxford University Press:
https://doi.org/10.1093/bioinformatics/btz199 (open access). Timo M. Deist
and Andrew Patti contributed equally to this wor
Efficiency at maximum power output of quantum heat engines under finite-time operation
We study the efficiency at maximum power, , of irreversible quantum
Carnot engines (QCEs) that perform finite-time cycles between a hot and a cold
reservoir at temperatures and , respectively. For QCEs in the
reversible limit (long cycle period, zero dissipation), becomes
identical to Carnot efficiency . For QCE cycles in
which nonadiabatic dissipation and time spent on two adiabats are included, the
efficiency at maximum power output is bounded from above by
and from below by . In the
case of symmetric dissipation, the Curzon-Ahlborn efficiency
is recovered under the condition that
the time allocation between the adiabats and the contact time with the
reservoir satisfy a certain relation.Comment: to be published in Phys. Rev. E (2012
All-in-one aerial image enhancement network for forest scenes
Drone monitoring plays an irreplaceable and significant role in forest firefighting due to its characteristics of wide-range observation and real-time messaging. However, aerial images are often susceptible to different degradation problems before performing high-level visual tasks including but not limited to smoke detection, fire classification, and regional localization. Recently, the majority of image enhancement methods are centered around particular types of degradation, necessitating the memory unit to accommodate different models for distinct scenarios in practical applications. Furthermore, such a paradigm requires wasted computational and storage resources to determine the type of degradation, making it difficult to meet the real-time and lightweight requirements of real-world scenarios. In this paper, we propose an All-in-one Image Enhancement Network (AIENet) that can restore various degraded images in one network. Specifically, we design a new multi-scale receptive field image enhancement block, which can better reconstruct high-resolution details of target regions of different sizes. In particular, this plug-and-play module enables it to be embedded in any learning-based model. And it has better flexibility and generalization in practical applications. This paper takes three challenging image enhancement tasks encountered in drone monitoring as examples, whereby we conduct task-specific and all-in-one image enhancement experiments on a synthetic forest dataset. The results show that the proposed AIENet outperforms the state-of-the-art image enhancement algorithms quantitatively and qualitatively. Furthermore, extra experiments on high-level vision detection also show the promising performance of our method compared with some recent baselines.Award-winningPostprint (published version
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