4,747 research outputs found
Topology and geometry of elliptic Feynman amplitudes
We report on the analytic computation of the 2-loop amplitude for Bhabha
scattering in QED. We study the analytic structure of the amplitude, and reveal
its underlying connections to hyperbolic Coxeter groups and arithmetic
geometries of elliptic curves.Comment: 12 pages, 4 figures, conferenc
Two-loop QED corrections to the scattering of four massive leptons
We study two-loop corrections to the scattering amplitude of four massive
leptons in quantum electrodynamics. These amplitudes involve previously unknown
elliptic Feynman integrals, which we compute analytically using the
differential equation method. In doing so, we uncover the details of the
elliptic geometry underlying this scattering amplitude and show how to exploit
its properties to obtain compact, easy-to-evaluate series expansions that
describe the scattering of four massive leptons in QED in the kinematical
regions relevant for Bhabha and M{\o}ller scattering processes.Comment: 9 pages, 3 figure
Towards Real-World Applications of Personalized Anesthesia Using Policy Constraint Q Learning for Propofol Infusion Control
Automated anesthesia promises to enable more precise and personalized
anesthetic administration and free anesthesiologists from repetitive tasks,
allowing them to focus on the most critical aspects of a patient's surgical
care. Current research has typically focused on creating simulated environments
from which agents can learn. These approaches have demonstrated good
experimental results, but are still far from clinical application. In this
paper, Policy Constraint Q-Learning (PCQL), a data-driven reinforcement
learning algorithm for solving the problem of learning anesthesia strategies on
real clinical datasets, is proposed. Conservative Q-Learning was first
introduced to alleviate the problem of Q function overestimation in an offline
context. A policy constraint term is added to agent training to keep the policy
distribution of the agent and the anesthesiologist consistent to ensure safer
decisions made by the agent in anesthesia scenarios. The effectiveness of PCQL
was validated by extensive experiments on a real clinical anesthesia dataset.
Experimental results show that PCQL is predicted to achieve higher gains than
the baseline approach while maintaining good agreement with the reference dose
given by the anesthesiologist, using less total dose, and being more responsive
to the patient's vital signs. In addition, the confidence intervals of the
agent were investigated, which were able to cover most of the clinical
decisions of the anesthesiologist. Finally, an interpretable method, SHAP, was
used to analyze the contributing components of the model predictions to
increase the transparency of the model.Comment: 11 pages, 7 figure
From Canteen Food to Daily Meals: Generalizing Food Recognition to More Practical Scenarios
The precise recognition of food categories plays a pivotal role for
intelligent health management, attracting significant research attention in
recent years. Prominent benchmarks, such as Food-101 and VIREO Food-172,
provide abundant food image resources that catalyze the prosperity of research
in this field. Nevertheless, these datasets are well-curated from canteen
scenarios and thus deviate from food appearances in daily life. This
discrepancy poses great challenges in effectively transferring classifiers
trained on these canteen datasets to broader daily-life scenarios encountered
by humans. Toward this end, we present two new benchmarks, namely DailyFood-172
and DailyFood-16, specifically designed to curate food images from everyday
meals. These two datasets are used to evaluate the transferability of
approaches from the well-curated food image domain to the everyday-life food
image domain. In addition, we also propose a simple yet effective baseline
method named Multi-Cluster Reference Learning (MCRL) to tackle the
aforementioned domain gap. MCRL is motivated by the observation that food
images in daily-life scenarios exhibit greater intra-class appearance variance
compared with those in well-curated benchmarks. Notably, MCRL can be seamlessly
coupled with existing approaches, yielding non-trivial performance
enhancements. We hope our new benchmarks can inspire the community to explore
the transferability of food recognition models trained on well-curated datasets
toward practical real-life applications
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