205 research outputs found
On the complex constant rank condition and inequalities for differential operators
In this note, we study the complex constant rank condition for differential
operators and its implications for coercive differential inequalities. These
are inequalities of the form for exponents and homogeneous
constant-coefficient differential operators and . The
functions are defined on open and bounded
sets satisfying certain regularity assumptions.
Depending on the order of and , such an inequality might be
viewed as a generalisation of either Korn's or Sobolev's inequality,
respectively. In both cases, as we are on bounded domains, we assume that the
Fourier symbol of satisfies an algebraic condition, the complex
constant rank property.Comment: 15 page
Driver-aware charging infrastructure design
Public charging infrastructure plays a crucial role in the context of
electrifying the private mobility sector in particular for urban regions.
Against this background, we develop a new mathematical model for the optimal
placement of public charging stations for electric vehicles in cities. While
existing approaches strongly aggregate traffic information or are only
applicable to small instances, we formulate the problem as a specific
combinatorial optimization problem that incorporates individual demand and
temporal interactions of drivers, exact positioning of charging stations, as
well as various charging speeds, and realistic charging curves. We show that
the problem can be naturally cast as an integer program that, together with
different reformulation techniques, can be efficiently solved for large
instances. More specifically, we show that our approach can compute optimal
placements of charging stations for instances based on traffic data for cities
with up to inhabitants and future electrification rates of up to
Transport and magnetic properties of La_(1-x)Ca_xMnO_3-films (0.1<x<0.9)
By laser ablation we prepared thin films of the colossal magnetoresistive
compound La_(1-x)Ca_xMnO_3 with doping levels 0.1<x<0.9 on MgO substrates.
X-ray diffraction revealed epitaxial growth and a systematic decrease of the
lattice constants with doping. The variation of the transport and magnetic
properties in this doping series was investigated by SQUID magnetization and
electrical transport measurements. For the nonmetallic samples resistances up
to 10^13 Ohm have been measured with an electrometer setup. While the transport
data indicate polaronic transport for the metallic samples above the Curie
temperature the low doped ferromagnetic insulating samples show a variable
range hopping like transport at low temperature.Comment: 2 pages, 3 EPS figures, LT22 Proceedings to appear in Physica
Contrastive Representation Learning for Whole Brain Cytoarchitectonic Mapping in Histological Human Brain Sections
Cytoarchitectonic maps provide microstructural reference parcellations of the
brain, describing its organization in terms of the spatial arrangement of
neuronal cell bodies as measured from histological tissue sections. Recent work
provided the first automatic segmentations of cytoarchitectonic areas in the
visual system using Convolutional Neural Networks. We aim to extend this
approach to become applicable to a wider range of brain areas, envisioning a
solution for mapping the complete human brain. Inspired by recent success in
image classification, we propose a contrastive learning objective for encoding
microscopic image patches into robust microstructural features, which are
efficient for cytoarchitectonic area classification. We show that a model
pre-trained using this learning task outperforms a model trained from scratch,
as well as a model pre-trained on a recently proposed auxiliary task. We
perform cluster analysis in the feature space to show that the learned
representations form anatomically meaningful groups.Comment: Accepted to ISBI 202
BUSSARD -- Better Understanding Social Situations for Autonomous Robot Decision-Making
We report on our effort to create a corpus dataset of different social
context situations in an office setting for further disciplinary and
interdisciplinary research in computer vision, psychology, and
human-robot-interaction. For social robots to be able to behave appropriately,
they need to be aware of the social context they act in. Consider, for example,
a robot with the task to deliver a personal message to a person. If the person
is arguing with an office mate at the time of message delivery, it might be
more appropriate to delay playing the message as to respect the recipient's
privacy and not to interfere with the current situation. This can only be done
if the situation is classified correctly and in a second step if an appropriate
behavior is chosen that fits the social situation. Our work aims to enable
robots accomplishing the task of classifying social situations by creating a
dataset composed of semantically annotated video scenes of office situations
from television soap operas. The dataset can then serve as a basis for
conducting research in both computer vision and human-robot interaction.Comment: In SCRITA 2023 Workshop Proceedings (arXiv:2311.05401) held in
conjunction with 32nd IEEE International Conference on Robot & Human
Interactive Communication, 28/08 - 31/08 2023, Busan (Korea
Decision-Theoretic Planning with Linguistic Terms in GOLOG
Abstract In this paper we propose an extension of the action language GOLOG that integrates linguistic terms in non-deterministic argument choices and the reward function for decision-theoretic planning. It is often cumbersome to specify the set of values to pick from in the non-deterministic-choice-of-argument statement. Also, specifying a reward function is not always easy, even for domain experts. Instead of providing a finite domain for values in the non-deterministic-choice-of-argument statement in GOLOG, we now allow for stating the argument domain by simply providing a formula over linguistic terms and fuzzy fluents. In GOLOG's forwardsearch DT planning algorithm, these formulas are evaluated in order to find the agent's optimal policy. We illustrate this in the Diner Domain where the agent needs to calculate the optimal serving order
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