55,427 research outputs found
An information theory for preferences
Recent literature in the last Maximum Entropy workshop introduced an analogy
between cumulative probability distributions and normalized utility functions.
Based on this analogy, a utility density function can de defined as the
derivative of a normalized utility function. A utility density function is
non-negative and integrates to unity. These two properties form the basis of a
correspondence between utility and probability. A natural application of this
analogy is a maximum entropy principle to assign maximum entropy utility
values. Maximum entropy utility interprets many of the common utility functions
based on the preference information needed for their assignment, and helps
assign utility values based on partial preference information. This paper
reviews maximum entropy utility and introduces further results that stem from
the duality between probability and utility
Extended Minimal Flavour Violating MSSM and Implications for B Physics
The recently reported measurements of the CP asymmetry a(psi K) by the BABAR
and BELLE collaborations are in good agreement with the standard model (SM)
prediction, resulting from the unitarity of the CKM matrix. The so-called
minimal flavour violating (MFV) supersymmetric extensions of the standard
model, in which the CKM matrix remains the only flavour changing structure,
predict a(psi K) similar to the one in the SM. With the anticipated precision
in a(psi K) and other CP asymmetries at the B factories and hadron colliders,
one hopes to pin down any possible deviation from the SM. We discuss an
extension of the MFV-supersymmetric models which comfortably accommodates the
current measurements of the CP asymmetry a(psi K), but differs from the SM and
the MFV-supersymmetric models due to an additional flavour changing structure
beyond the CKM matrix. We suggest specific tests in forthcoming experiments in
B physics. In addition to the CP-asymmetries in B-meson decays, such as a(psi
K) and a(pi pi), and the mass difference Delta M_s in the Bs-bar(Bs) system, we
emphasize measurements of the radiative transition b -> d gamma as sensitive
probes of the postulated flavour changing structure. Interestingly, the
CKM-unitarity analysis in the Extended-MFV model also allows solutions rho < 0,
as opposed to the SM and the MFV models for which only rho > 0 solutions are
now admissible, implying gamma > pi/2, where gamma=- arg (Vub). Such large
values of gamma are hinted by the current measurements of the branching ratios
for the decays B -> pi pi and B -> K pi.Comment: 35 pages, 12 figures. Theoretical analysis modified in view of the
recent CP violation observed in B-> J/Psi K decays. Resulting constraints on
the model parameters are recompute
Thermal response of large area high temperature superconducting YBaCuO infrared bolometer
Thermal analysis of large area high temperature superconducting infrared detector operating in the equilibrium mode (bolometer) was performed. An expression for the temperature coefficient beta=1/R(dR/dT) in terms of the thermal conductance and the thermal time constant of the detector were derived. A superconducting transition edge bolometer is a thermistor consisting of a thin film superconducting YBaCuO evaporated into a suitable thermally isolated substrate. The operating temperature of the bolometer is maintained close to the midpoint of the superconducting transition region where the resistance R has a maximum dynamic range. A detector with a strip configuration was analyzed and an expression for the temperature rise (delta T) above the ambient due to a uniform illumination with a source of power density P(sub i) was calculated. An expression for the thermal responsivity of the detector was derived using the thermal diffusion analysis with appropriate boundary conditions. It was found that the thermal responsibility depends upon the spatial modulation frequency and the angular frequency of the incoming radiation. The problem of the thermal cross talk between different detector elements was addressed. In the case of monolithic HTS detector array with a row of square elements of dimensions 2a and CCD or CID readout electronics the thermal spread function was derived for different spacing between elements. This analysis can be critical for future design and applications of large area focal plane arrays as broad band optical detectors made of granular thin films HTS YBaCuO
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Radio frequency identification (RFID) technologies for locating warehouse resources: A conceptual framework
Copyright @ 2012 Information Technology SocietyIn the supply chain, a warehouse is a crucial component for linking all chain parties. It is necessary to track the real time resource location and status to support warehouse operations effectively. Therefore, RFID technology has been adopted to facilitate the collection and sharing of data in a warehouse environment. However, an essential decision should be made on the type of RFID tags the warehouse managers should adopt, because it is very important to implement RFID tags that work in warehouse environment. As a result, the warehouse resources will be easily tracked and accurately located which will improve the visibility of warehouse operations, enhance the productivity and reduce the operation costs of the warehouse. Therefore, it is crucial to evaluate the reading performance of all types of RFID tags in a warehouse environment in order to choose the most appropriate RFID tags which will enhance the operational efficiency of a warehouse. Reading performance of active and passive RFID tags have been evaluated before while, semi-passive RFID tag, which is battery-assisted with greater sensitivity than passive tags and cheaper than active tags, has not been examined yet in a warehouse environment. This research is in- progress research and it seeks to (i) provide a general overview of the existing real-time data management techniques in tracking warehouse resources location, (ii) provide an overall conceptual framework that can help warehouse managers to choose the best RFID technologies for a warehouse environment, (iii) Finally, the paper submits an experiment design for evaluating the reading performance of semi-passive RFID tags in a warehouse environment
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Encapsulated thermoacoustic projector based on freestanding carbon nanotube film
A suspended nanotube film (or films) producing sound by means of the thermoacoustic (TA) effect is encapsulated between two plates, at least one of which vibrates, to enhance sound generation efficiency and protect the film. To avoid the oxidation of carbon nanotubes at elevated temperatures and reduce the thermal inertia of surrounding medium the enclosure is filled with inert gas (preferably with high heat capacity ratio, γ=Cp/Cv, and low heat capacity, Cp). To generate sound directly as the first harmonic of applied audio signal without use of an energy consuming dc biasing, an audio signal modulated carrier frequency at much higher frequency is used to provide power input. Various other inventive means are described to provide enhanced projected sound intensity, increased projector efficiency, and lengthened projector life, like the use of infrared reflecting coatings and particles on the projector plates, non-parallel sheet alignment in sheet stacks, and cooling means on one projector side.Board of Regents, University of Texas Syste
Design and Simulation of Wave Shaping Schemes for a Virtual Data Communication and Impaired Link Environment System for Advanced ICT Education
Design and Simulation of Waves
Shaping Schemes for a Virtual Data
Communication and Impaired Link
Environment System for Advanced ICT
Education is aimed at providing a simulator for
the performance of digital filtering of signals for
data communication experiments with the aid of
MATLAB. A fundamental aspect of signal
processing is filtering. Filtering involves the
manipulation of the spectrum of a signal by
passing or blocking certain portions of the
spectrum, depending on the frequency of those
portions. This work is designed to provide a
flexible platform for teaching the operations of
waves shaping schemes (lowpass, bandpass and
highpass) modelled over an additive white
Gaussian noise (AWGN) channel.
Keywords – Lowpass, Bandpass, Highpass,
MATLAB
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