758,680 research outputs found
Conditioned Martingales
It is well known that upward conditioned Brownian motion is a
three-dimensional Bessel process, and that a downward conditioned Bessel
process is a Brownian motion. We give a simple proof for this result, which
generalizes to any continuous local martingale and clarifies the role of finite
versus infinite time in this setting. As a consequence, we can describe the law
of regular diffusions that are conditioned upward or downward.Comment: Corrected several typos, improved formulations. Accepted by
Electronic Communications in Probability; Electronic Communications in
Probability, 2012, Volume 17, Issue 4
Conditioned Brownian trees
We consider a Brownian tree consisting of a collection of one-dimensional
Brownian paths started from the origin, whose genealogical structure is given
by the Continuum Random Tree (CRT). This Brownian tree may be generated from
the Brownian snake driven by a normalized Brownian excursion, and thus yields a
convenient representation of the so-called Integrated Super-Brownian Excursion
(ISE), which can be viewed as the uniform probability measure on the tree of
paths. We discuss different approaches that lead to the definition of the
Brownian tree conditioned to stay on the positive half-line. We also establish
a Verwaat-like theorem showing that this conditioned Brownian tree can be
obtained by re-rooting the unconditioned one at the vertex corresponding to the
minimal spatial position. In terms of ISE, this theorem yields the following
fact: Conditioning ISE to put no mass on and letting
go to 0 is equivalent to shifting the unconditioned ISE to the right
so that the left-most point of its support becomes the origin. We derive a
number of explicit estimates and formulas for our conditioned Brownian trees.
In particular, the probability that ISE puts no mass on
is shown to behave like when goes to 0. Finally,
for the conditioned Brownian tree with a fixed height , we obtain a
decomposition involving a spine whose distribution is absolutely continuous
with respect to that of a nine-dimensional Bessel process on the time interval
, and Poisson processes of subtrees originating from this spine.Comment: 42 page
Air conditioned suit
An environmentally controlled suit is described consisting of an airtight outergarment attached by an airtight bellows to the wall of a sterile chamber, an undergarment providing for circulation of air near the skin of the wearer, and a circulation system comprised of air supply and distribution to the extremities of the undegarment and central collection and exhaust of air from the midsection of the undergarment. A workman wearing the undergarment and attached circulation system enters the outer garment through a tunnel in the chamber wall and the attached bellows to work in the chamber without any danger of spreading bacteria
ConSIT: A conditioned program slicer
Conditioned slicing is a powerful generalisation of static and dynamic slicing which has applications to many problems in software maintenance and evolution, including reuse, reengineering and program comprehension. However there has been relatively little work on the implementation of conditioned slicing. Algorithms for implementing conditioned slicing necessarily involve reasoning about the values of program predicates in certain sets of states derived from the conditioned slicing criterion, making implementation particularly demanding. The paper introduces ConSIT, a conditioned slicing system which is based upon conventional static slicing, symbolic execution and theorem proving. ConSIT is the first fully automated implementation of conditioned slicing. An implementation of ConSIT is available for experimentation at &http://www.mcs.gold.ac.uk/tilde/~mas01sd/consit.htm
Simulation of conditioned diffusions
In this paper, we propose some algorithms for the simulation of the
distribution of certain diffusions conditioned on terminal point. We prove that
the conditional distribution is absolutely continuous with respect to the
distribution of another diffusion which is easy for simulation, and the formula
for the density is given explicitly
Domain Conditioned Adaptation Network
Tremendous research efforts have been made to thrive deep domain adaptation
(DA) by seeking domain-invariant features. Most existing deep DA models only
focus on aligning feature representations of task-specific layers across
domains while integrating a totally shared convolutional architecture for
source and target. However, we argue that such strongly-shared convolutional
layers might be harmful for domain-specific feature learning when source and
target data distribution differs to a large extent. In this paper, we relax a
shared-convnets assumption made by previous DA methods and propose a Domain
Conditioned Adaptation Network (DCAN), which aims to excite distinct
convolutional channels with a domain conditioned channel attention mechanism.
As a result, the critical low-level domain-dependent knowledge could be
explored appropriately. As far as we know, this is the first work to explore
the domain-wise convolutional channel activation for deep DA networks.
Moreover, to effectively align high-level feature distributions across two
domains, we further deploy domain conditioned feature correction blocks after
task-specific layers, which will explicitly correct the domain discrepancy.
Extensive experiments on three cross-domain benchmarks demonstrate the proposed
approach outperforms existing methods by a large margin, especially on very
tough cross-domain learning tasks.Comment: Accepted by AAAI 202
Apparatus for supplying conditioned air at a substantially constant temperature and humidity
The apparatus includes a supply duct coupled to a source of supply air for carrying the supply air therethrough. A return duct is coupled to the supply duct for carrying return conditioned air therethrough. A temperature reducing device is coupled to the supply duct for decreasing the temperature of the supply and return conditioned air. A by-pass duct is coupled to the supply duct for selectively directing portions of the supply and return conditioned air around the temperature reducing device. Another by-pass duct is coupled to the return duct for selectively directing portions of the return conditioned air around the supply duct and the temperature reduction device. Controller devices selectively control the flow and amount of mixing of the supply and return conditioned air
Conditioned Unitary Transformation on biphotons
A conditioned unitary transformation ( polarization rotation) is
performed at single-photon level. The transformation is realized by rotating
polarization for one of the photons of a polarization-entangled biphoton state
(signal photon) by means of a Pockel's cell triggered by the detection of the
other (idler) photon after polarization selection. As a result, polarization
degree for the signal beam changes from zero to the value given by the idler
detector quantum efficiency. This result is relevant to practical realization
of various quantum information schemes and can be used for developing a new
method of absolute quantum efficiency calibration
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