12,321 research outputs found
Orbifold cup products and ring structures on Hochschild cohomologies
In this paper we study the Hochschild cohomology ring of convolution algebras
associated to orbifolds, as well as their deformation quantizations. In the
first case the ring structure is given in terms of a wedge product on twisted
polyvectorfields on the inertia orbifold. After deformation quantization, the
ring structure defines a product on the cohomology of the inertia orbifold. We
study the relation between this product and an -equivariant version of the
Chen--Ruan product. In particular, we give a de Rham model for this equivariant
orbifold cohomology
Cumulative Prospect Theory Based Dynamic Pricing for Shared Mobility on Demand Services
Cumulative Prospect Theory (CPT) is a modeling tool widely used in behavioral
economics and cognitive psychology that captures subjective decision making of
individuals under risk or uncertainty. In this paper, we propose a dynamic
pricing strategy for Shared Mobility on Demand Services (SMoDSs) using a
passenger behavioral model based on CPT. This dynamic pricing strategy together
with dynamic routing via a constrained optimization algorithm that we have
developed earlier, provide a complete solution customized for SMoDS of
multi-passenger transportation. The basic principles of CPT and the derivation
of the passenger behavioral model in the SMoDS context are described in detail.
The implications of CPT on dynamic pricing of the SMoDS are delineated using
computational experiments involving passenger preferences. These implications
include interpretation of the classic fourfold pattern of risk attitudes,
strong risk aversion over mixed prospects, and behavioral preferences of self
reference. Overall, it is argued that the use of the CPT framework corresponds
to a crucial building block in designing socio-technical systems by allowing
quantification of subjective decision making under risk or uncertainty that is
perceived to be otherwise qualitative.Comment: 17 pages, 6 figures, and has been accepted for publication at the
58th Annual Conference on Decision and Control, 201
Study of the Brazil and Falkland currents using their images of Nimbus 5 and oceanographic data in 1972 - 1973
The Western Edge of the Sub-tropical Convergence of the South-western Atlantic Ocean, called the Front, which is a thermal discontinuity between the Brazil and Falkland Currents, was studied utilizing the Temperature Humidity Infrared Radiometer (THIR) of Nimbus V in the 10.5 to 12.5 micrometers channel and historical oceanographic data. Some important results obtained are: the oceanographic Front could be detected from Nimbus THIR data; oceanographic charts showed that the transition zone where the Brazil and the Falkland Currents meet was the Front detected from satellite data; ocean current speeds calculated with THIR data were of the same order of magnitude as those calculated oceanographically; fisheries statistics for Pargo Roseo showed that the maximum catches were in September of 1973, in the period when the Front was observed most distinctly and clearly. The results showed the great potentiality of satellite data to study surface thermal structures, surface currents and oceanic fisheries
Fast-Light in a Photorefractive Crystal for Gravitational Wave Detection
We demonstrate superluminal light propagation using two frequency multiplexed
pump beams to produce a gain doublet in a photorefractive crystal of Ce:BaTiO3.
The two gain lines are obtained by two-wave mixing between a probe field and
two individual pump fields. The angular frequencies of the pumps are
symmetrically tuned from the frequency of the probe. The frequency difference
between the pumps corresponds to the separation of the two gain lines; as it
increases, the crystal gradually converts from normal dispersion without
detuning to an anomalously dispersive medium. The time advance is measured as
0.28 sec for a pulse propagating through a medium with a 2Hz gain separation,
compared to the same pulse propagating through empty space. We also demonstrate
directly anomalous dispersion profile using a modfied experimental
configuration. Finally, we discuss how anomalous dispersion produced this way
in a faster photorefractive crystal (such as SPS: Sn2P2S6) could be employed to
enhance the sensitivity-bandwidth product of a LIGO type gravitational wave
detector augmented by a White Light Cavity.Comment: 14 pages, 5 figure
Kan replacement of simplicial manifolds
We establish a functor from local Kan simplicial manifolds to weak Kan
simplicial manifolds. It gives a solution to the problem of extending local Lie
groupoids to Lie 2-groupoids.Comment: 19 pages, 11 figures, Lemma 2.2 improved, Prop.-Def. 2.3 modified. to
appear in Letters in Mathematical Physic
Muon Pair Production by Electron-Photon Scatterings
The cross section for muon pair productions by electrons scattering over
photons, , is calculated analytically in the leading order. It is
pointed out that for the center-of-mass energy range, ,
the cross section for is less than b. The differential
energy spectrum for either of the resulting muons is given for the purpose of
high-energy neutrino astronomy. An implication of our result for a recent
suggestion concerning the high-energy cosmic neutrino generation through this
muon pair is discussed.Comment: a comment added, to appear in Phys. Rev. D, Rapid Communicatio
Towards Dynamic Pricing for Shared Mobility on Demand using Markov Decision Processes and Dynamic Programming
In a Shared Mobility on Demand Service (SMoDS), dynamic pricing plays an
important role in the form of an incentive for the decision of the empowered
passenger on the ride offer. Strategies for determining the dynamic tariff
should be suitably designed so that the incurred demand and supply are balanced
and therefore economic efficiency is achieved. In this manuscript, we formulate
a discrete time Markov Decision Process (MDP) to determine the probability
desired by the SMoDS platform corresponding to the acceptance rate of each
empowered passenger at each state of the system. We use Estimated Waiting Time
(EWT) as the metric for the balance between demand and supply, with the goal
that EWT be regulated around a target value. We then develop a Dynamic
Programming (DP) algorithm to derive the optimal policy of the MDP that
regulates EWT around the target value. Computational experiments are conducted
that demonstrate the regulation of EWT is effective, through various scenarios.
The overall demonstration is carried out offline. The MDP formulation together
with the DP algorithm can be utilized to an online determination of the dynamic
tariff by integrating with our earlier works on Cumulative Prospect Theory
based passenger behavioral modeling and the AltMin dynamic routing algorithm,
and form the subject of future works.Comment: 17 pages, 6 figures, and has been accepted for publication at the
23rd IEEE International Conference on Intelligent Transportation Systems,
202
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