9,857 research outputs found
Spiking Neural Networks for Early Prediction in Human Robot Collaboration
This paper introduces the Turn-Taking Spiking Neural Network (TTSNet), which
is a cognitive model to perform early turn-taking prediction about human or
agent's intentions. The TTSNet framework relies on implicit and explicit
multimodal communication cues (physical, neurological and physiological) to be
able to predict when the turn-taking event will occur in a robust and
unambiguous fashion. To test the theories proposed, the TTSNet framework was
implemented on an assistant robotic nurse, which predicts surgeon's turn-taking
intentions and delivers surgical instruments accordingly. Experiments were
conducted to evaluate TTSNet's performance in early turn-taking prediction. It
was found to reach a F1 score of 0.683 given 10% of completed action, and a F1
score of 0.852 at 50% and 0.894 at 100% of the completed action. This
performance outperformed multiple state-of-the-art algorithms, and surpassed
human performance when limited partial observation is given (< 40%). Such early
turn-taking prediction capability would allow robots to perform collaborative
actions proactively, in order to facilitate collaboration and increase team
efficiency.Comment: Under review for journa
Early Prediction for Physical Human Robot Collaboration in the Operating Room
To enable a natural and fluent human robot collaboration flow, it is critical
for a robot to comprehend their human peers' on-going actions, predict their
behaviors in the near future, and plan its actions correspondingly.
Specifically, the capability of making early predictions is important, so that
the robot can foresee the precise timing of a turn-taking event and start
motion planning and execution early enough to smooth the turn-taking
transition. Such proactive behavior would reduce human's waiting time, increase
efficiency and enhance naturalness in collaborative task. To that end, this
paper presents the design and implementation of an early turn-taking prediction
algorithm, catered for physical human robot collaboration scenarios.
Specifically, a Robotic Scrub Nurse (RSN) system which can comprehend surgeon's
multimodal communication cues and perform turn-taking prediction is presented.
The developed algorithm was tested on a collected data set of simulated
surgical procedures in a surgeon-nurse tandem. The proposed turn-taking
prediction algorithm is found to be significantly superior to its algorithmic
counterparts, and is more accurate than human baseline when little partial
input is given (less than 30% of full action). After observing more
information, the algorithm can achieve comparable performances as humans with a
F1 score of 0.90
Object Tracking in Hyperspectral Videos with Convolutional Features and Kernelized Correlation Filter
Target tracking in hyperspectral videos is a new research topic. In this
paper, a novel method based on convolutional network and Kernelized Correlation
Filter (KCF) framework is presented for tracking objects of interest in
hyperspectral videos. We extract a set of normalized three-dimensional cubes
from the target region as fixed convolution filters which contain spectral
information surrounding a target. The feature maps generated by convolutional
operations are combined to form a three-dimensional representation of an
object, thereby providing effective encoding of local spectral-spatial
information. We show that a simple two-layer convolutional networks is
sufficient to learn robust representations without the need of offline training
with a large dataset. In the tracking step, KCF is adopted to distinguish
targets from neighboring environment. Experimental results demonstrate that the
proposed method performs well on sample hyperspectral videos, and outperforms
several state-of-the-art methods tested on grayscale and color videos in the
same scene.Comment: Accepted by ICSM 201
Coherent control via interplay between driving field and two-body interaction in a double well
We investigate interplay between external field and interatomic interaction
and its applications to coherent control of quantum tunneling for two repulsive
bosons confined in a high-frequency driven double well. A full solution of the
system is generated analytically as a coherent non-Floquet state by using the
Floquet states as a set of complete bases. It is demonstrated that the photon
resonance of interaction leads to translation of the Floquet level-crossing
points, and the non-resonant interaction causes avoided crossing of partial
levels. In the non-Floquet states, the bosons beyond the crossing points slowly
vary their populations, and the resonant (non-resonant) interactions enhance
(decrease) the tunneling rate of the paired particles. Three different kinds of
the coherent destructions of tunneling (CDT) at the crossing, avoided-crossing
and uncrossing points, and the corresponding stationary-like states, are
illustrated. The analytical results are numerically confirmed and perfect
agreements are found. Based on the results, an useful scheme of quantum
tunneling switch between stationary-like states is presented.Comment: 7 pages, 5 figure
Communication Modalities for Supervised Teleoperation in Highly Dexterous Tasks - Does one size fit all?
This study tries to explain the connection between communication modalities
and levels of supervision in teleoperation during a dexterous task, like
surgery. This concept is applied to two surgical related tasks: incision and
peg transfer. It was found that as the complexity of the task escalates, the
combination linking human supervision with a more expressive modality shows
better performance than other combinations of modalities and control. More
specifically, in the peg transfer task, the combination of speech modality and
action level supervision achieves shorter task completion time (77.1 +- 3.4 s)
with fewer mistakes (0.20 +- 0.17 pegs dropped).Comment: Previously published online at 2nd Workshop on the Role of Human
Sensormotor Control in Surgical Robotics at 2015 IEEE/RSJ International
Conference on Intelligent Robots and Systems (IROS), Hamburg, German
Decay to + 2 or + + 2
The BES Collaboration has measured decay to .
Using the mixed hybrid theory for the we estimate the decay to
+ . Using the known coupling
constant, we estimate the to + decay rate and
angular distribution. This is an extension of our previous research on
Decay to + + 2, without the production
of 2, and with an estimate of the
transition.Comment: 11 pages, 7 figures. arXiv admin note: substantial text overlap with
arXiv:1509.0836
Cubic vertex-transitive non-Cayley graphs of order 12p
A graph is said to be {\em vertex-transitive non-Cayley} if its full
automorphism group acts transitively on its vertices and contains no subgroups
acting regularly on its vertices. In this paper, a complete classification of
cubic vertex-transitive non-Cayley graphs of order , where is a prime,
is given. As a result, there are sporadic and one infinite family of such
graphs, of which the sporadic ones occur when , or , and the
infinite family exists if and only if , and in this family
there is a unique graph for a given order.Comment: This paper has been accepted for publication in SCIENCE CHINA
Mathematic
Nonzero Mean Squared Momentum of Quarks in the Non-Perturbative QCD Vacuum
The non-local vacuum condensates of QCD describe the distributions of quarks
and gluons in the non-perturbative QCD vacuum. Physically, this means that
vacuum quarks and gluons have nonzero mean-squared momentum, called virtuality.
In this paper we study the quark virtuality which is given by the ratio of the
local quark-gluon mixed vacuum condensate to the quark local vacuum condensate.
The two vacuum condensates are obtained by solving Dyson-Schwinger Equations of
a fully dressed quark propagator with an effective gluon propagator. Using our
calculated condensates, we obtain the virtuality of quarks in the QCD vacuum
state. Our numerical predictions differ from the other theoretical model
calculations such as QCD sum rules, Lattice QCD and instanton models.Comment: 8 pages, no figures, 4 tables Our previous version had an error, and
the results in this new version are quite different
Quark Virtuality Distribution in Non-perturbative QCD Vacuum
We introduce the quark virtuality distribution [] as an
extenson of the quark virtuality by using nonlocal rather than local quark
vacuum condensates. Our results show that the quark virtuality distribution
decreases gradually from a finite value to zero as increases. This clearly
indicates that quarks are confined inside hadrons, whereas, as approaches
zero quarks have a finite virtuality, which shows asymptotic freedom of quarks
in QCD. The present predictions are important not only for studying the
properties of QCD vacuum states, and non-perturbative QCD problems, but also
for study of the cosmological constant problem, which we have shown should be
treated using nonlocal quark vacuum condensate in the Ghost theory of QCD.Comment: 5 pages, 1 figur
Reconstructing light curves from HXMT imaging observations
The Hard X-ray Modulation Telescope (HXMT) is a Chinese space telescope
mission. It is scheduled for launch in 2015. The telescope will perform an
all-sky survey in hard X-ray band (1 - 250 keV), a series of deep imaging
observations of small sky regions as well as pointed observations. In this work
we present a conceptual method to reconstruct light curves from HXMT imaging
observation directly, in order to monitor time-varying objects such as GRB, AXP
and SGR in hard X-ray band with HXMT imaging observations.Comment: In proceedings of Statistical Challenges of 21st Century Cosmology,
an International Astronomy Union Symposia. 1 figur
- …