1,618 research outputs found
Almost Surely Regret Bound for Adaptive LQR
The Linear-Quadratic Regulation (LQR) problem with unknown system parameters
has been widely studied, but it has remained unclear whether regret, which is the best known dependence on time, can
be achieved almost surely. In this paper, we propose an adaptive LQR controller
with almost surely regret upper bound. The
controller features a circuit-breaking mechanism, which circumvents potential
safety breach and guarantees the convergence of the system parameter estimate,
but is shown to be triggered only finitely often and hence has negligible
effect on the asymptotic performance of the controller. The proposed controller
is also validated via simulation on Tennessee Eastman Process~(TEP), a commonly
used industrial process example
Robot Composite Learning and the Nunchaku Flipping Challenge
Advanced motor skills are essential for robots to physically coexist with
humans. Much research on robot dynamics and control has achieved success on
hyper robot motor capabilities, but mostly through heavily case-specific
engineering. Meanwhile, in terms of robot acquiring skills in a ubiquitous
manner, robot learning from human demonstration (LfD) has achieved great
progress, but still has limitations handling dynamic skills and compound
actions. In this paper, we present a composite learning scheme which goes
beyond LfD and integrates robot learning from human definition, demonstration,
and evaluation. The method tackles advanced motor skills that require dynamic
time-critical maneuver, complex contact control, and handling partly soft
partly rigid objects. We also introduce the "nunchaku flipping challenge", an
extreme test that puts hard requirements to all these three aspects. Continued
from our previous presentations, this paper introduces the latest update of the
composite learning scheme and the physical success of the nunchaku flipping
challenge
Safe and Efficient Switching Controller Design for Partially Observed Linear-Gaussian Systems
Switching control strategies that unite a potentially high-performance but
uncertified controller and a stabilizing albeit conservative controller are
shown to be able to balance safety with efficiency, but have been less studied
under partial observation of state. To address this gap, we propose a switching
control strategy for partially observed linear-Gaussian systems with provable
performance guarantees. We show that the proposed switching strategy is both
safe and efficient, in the sense that: (1) the linear-quadratic cost of the
system is always bounded even if the original uncertified controller is
destabilizing; (2) in the case when the uncertified controller is stabilizing,
the performance loss induced by the conservativeness of switching converges
super-exponentially to zero. The effectiveness of the switching strategy is
also demonstrated via numerical simulation on the Tennessee Eastman Process
Fuzzy Random Traveling Salesman Problem
The travelling salesman problem is to find a shortest path from the travelling salesman’s hometown, make the round of all the towns in the set, and finally go back home. This paper investigates the travelling salesman problem with fuzzy random travelling time. Three concepts are proposed: expected shortest path, (α, β)-path and chance shortest path according to different optimal desire. Correspondingly, by using the concepts as decision criteria, three fuzzy random programming models for TSP are presented. Finally, a hybrid intelligent algorithm is designed to solve these models, and some numerical examples are provided to illustrate its effectiveness
Distribution of the k-regular partition function modulo composite integers M
Let denote the regular partitons of a natural number . In
this paper, we study the behavior of modulo composite integers
which are coprime to . Specially, we prove that for arbitrary regular
partiton function and integer coprime to , there are infinitely
many Ramanujan-type congruences of modulo
Physics Inspired Optimization on Semantic Transfer Features: An Alternative Method for Room Layout Estimation
In this paper, we propose an alternative method to estimate room layouts of
cluttered indoor scenes. This method enjoys the benefits of two novel
techniques. The first one is semantic transfer (ST), which is: (1) a
formulation to integrate the relationship between scene clutter and room layout
into convolutional neural networks; (2) an architecture that can be end-to-end
trained; (3) a practical strategy to initialize weights for very deep networks
under unbalanced training data distribution. ST allows us to extract highly
robust features under various circumstances, and in order to address the
computation redundance hidden in these features we develop a principled and
efficient inference scheme named physics inspired optimization (PIO). PIO's
basic idea is to formulate some phenomena observed in ST features into
mechanics concepts. Evaluations on public datasets LSUN and Hedau show that the
proposed method is more accurate than state-of-the-art methods.Comment: To appear in CVPR 2017. Project Page:
https://sites.google.com/view/st-pio
An improvement on the parity of Schur's partition function
We improve S.-C. Chen's result on the parity of Schur's partition function.
Let be the number of Schur's partitions of , i.e., the number of
partitions of into distinct parts congruent to . S.-C. Chen
\cite{MR3959837} shows .
In this paper, we improve Chen's result to $\frac{x}{(\log{x})^{\frac{11}{12}}}
\ll \sharp \{0\le n\le x:A(2n+1)\; \text{is odd}\}\ll
\frac{x}{(\log{x})^{\frac{1}{2}}}.
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