460 research outputs found
Bichromatic field generation from double-four-wave mixing in a double-electromagnetically induced transparency system
We demonstrate the double electromagnetically induced transparency
(double-EIT) and double four-wave mixing (double-FWM) based on a new scheme of
non-degenerate four-wave mixing (FWM) involving five levels of a cold 85Rb
atomic ensemble, in which the double-EIT windows are used to transmit the probe
field and enhance the third-order nonlinear susceptibility. The phase-matching
conditions for both four-wave mixings could be satisfied simultaneously. The
frequency of one component of the generated bichromatic field is less than the
other by the ground-state hyperfine splitting (3GHz). This specially designed
experimental scheme for simultaneously generating different nonlinear
wave-mixing processes is expected to find applications in quantum information
processing and cross phase modulation. Our results agree well with the
theoretical simulation.Comment: Accepted by NJ
Unbiased Math Word Problems Benchmark for Mitigating Solving Bias
In this paper, we revisit the solving bias when evaluating models on current
Math Word Problem (MWP) benchmarks. However, current solvers exist solving bias
which consists of data bias and learning bias due to biased dataset and
improper training strategy. Our experiments verify MWP solvers are easy to be
biased by the biased training datasets which do not cover diverse questions for
each problem narrative of all MWPs, thus a solver can only learn shallow
heuristics rather than deep semantics for understanding problems. Besides, an
MWP can be naturally solved by multiple equivalent equations while current
datasets take only one of the equivalent equations as ground truth, forcing the
model to match the labeled ground truth and ignoring other equivalent
equations. Here, we first introduce a novel MWP dataset named UnbiasedMWP which
is constructed by varying the grounded expressions in our collected data and
annotating them with corresponding multiple new questions manually. Then, to
further mitigate learning bias, we propose a Dynamic Target Selection (DTS)
Strategy to dynamically select more suitable target expressions according to
the longest prefix match between the current model output and candidate
equivalent equations which are obtained by applying commutative law during
training. The results show that our UnbiasedMWP has significantly fewer biases
than its original data and other datasets, posing a promising benchmark for
fairly evaluating the solvers' reasoning skills rather than matching nearest
neighbors. And the solvers trained with our DTS achieve higher accuracies on
multiple MWP benchmarks. The source code is available at
https://github.com/yangzhch6/UnbiasedMWP
Photonic realization of topologically protected bound states in domain-wall waveguide arrays
We present an analytical theory of topologically protected photonic states
for the two-dimensional Maxwell equations for a class of continuous periodic
dielectric structures, modulated by a domain wall. We further numerically
confirm the applicability of this theory for three-dimensional structures.Comment: 6 pages, 5 figures. To appear in the Phys. Rev.
Applying the Cox Model to Study Online Gambling Behavior
Although a key objective of Internet gambling service providers is player retention, there is a concomitant need to reduce the social costs of gambling. Our study shows how habit and prospect theories help build an integrative framework for decision support in regulated Internet gambling environments. To illustrate the practical implication of this framework, we applied the Cox model with time-dependent covariates on real gambling data collected from 4,222 users of a gambling website. The results help establish the positive association of key indicators such as the prior outcomes on the activity lifespan of an Internet gambler and the moderating effect of gambling frequency on the positive association between prior outcomes and gambling lifespan. This research is expected to contribute to the literatures on IT adoption and diffusion in general, and IT-based addictive behavior in particular
Viia-hand: a Reach-and-grasp Restoration System Integrating Voice interaction, Computer vision and Auditory feedback for Blind Amputees
Visual feedback plays a crucial role in the process of amputation patients
completing grasping in the field of prosthesis control. However, for blind and
visually impaired (BVI) amputees, the loss of both visual and grasping
abilities makes the "easy" reach-and-grasp task a feasible challenge. In this
paper, we propose a novel multi-sensory prosthesis system helping BVI amputees
with sensing, navigation and grasp operations. It combines modules of voice
interaction, environmental perception, grasp guidance, collaborative control,
and auditory/tactile feedback. In particular, the voice interaction module
receives user instructions and invokes other functional modules according to
the instructions. The environmental perception and grasp guidance module
obtains environmental information through computer vision, and feedbacks the
information to the user through auditory feedback modules (voice prompts and
spatial sound sources) and tactile feedback modules (vibration stimulation).
The prosthesis collaborative control module obtains the context information of
the grasp guidance process and completes the collaborative control of grasp
gestures and wrist angles of prosthesis in conjunction with the user's control
intention in order to achieve stable grasp of various objects. This paper
details a prototyping design (named viia-hand) and presents its preliminary
experimental verification on healthy subjects completing specific
reach-and-grasp tasks. Our results showed that, with the help of our new
design, the subjects were able to achieve a precise reach and reliable grasp of
the target objects in a relatively cluttered environment. Additionally, the
system is extremely user-friendly, as users can quickly adapt to it with
minimal training
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