5,935 research outputs found
Improving non-linear fits
In this notes we describe an algorithm for non-linear fitting which
incorporates some of the features of linear least squares into a general
minimum fit and provide a pure Python implementation of the algorithm.
It consists of the variable projection method (varpro), combined with a Newton
optimizer and stabilized using the steepest descent with an adaptative step.
The algorithm includes a term to account for Bayesian priors. We performed
tests of the algorithm using simulated data. This method is suitable, for
example, for fitting with sums of exponentials as often needed in Lattice
Quantum Chromodynamics
Probabilistic data flow analysis: a linear equational approach
Speculative optimisation relies on the estimation of the probabilities that
certain properties of the control flow are fulfilled. Concrete or estimated
branch probabilities can be used for searching and constructing advantageous
speculative and bookkeeping transformations.
We present a probabilistic extension of the classical equational approach to
data-flow analysis that can be used to this purpose. More precisely, we show
how the probabilistic information introduced in a control flow graph by branch
prediction can be used to extract a system of linear equations from a program
and present a method for calculating correct (numerical) solutions.Comment: In Proceedings GandALF 2013, arXiv:1307.416
Process chain approach to high-order perturbation calculus for quantum lattice models
A method based on Rayleigh-Schroedinger perturbation theory is developed that
allows to obtain high-order series expansions for ground-state properties of
quantum lattice models. The approach is capable of treating both lattice
geometries of large spatial dimensionalities d and on-site degrees of freedom
with large state space dimensionalities. It has recently been used to
accurately compute the zero-temperature phase diagram of the Bose-Hubbard model
on a hypercubic lattice, up to arbitrary large filling and for d=2, 3 and
greater [Teichmann et al., Phys. Rev. B 79, 100503(R) (2009)].Comment: 11 pages, 6 figure
Quantifying Timing Leaks and Cost Optimisation
We develop a new notion of security against timing attacks where the attacker
is able to simultaneously observe the execution time of a program and the
probability of the values of low variables. We then show how to measure the
security of a program with respect to this notion via a computable estimate of
the timing leakage and use this estimate for cost optimisation.Comment: 16 pages, 2 figures, 4 tables. A shorter version is included in the
proceedings of ICICS'08 - 10th International Conference on Information and
Communications Security, 20-22 October, 2008 Birmingham, U
Molecular junctions for thermal transport between graphene nanoribbons: covalent bonding vs. interdigitated chains
Proper design and manufacturing thermal bridges based on molecular junctions
at the contact between graphene platelets or other thermally conductive
nanoparticles would provide a fascinating way to produce efficient heat
transport networks for the exploitation in heat management applications. In
this work, using Non Equilibrium Molecular Dynamics, we calculated thermal
conductance of alkyl chains used as molecular junctions between two graphene
nanoribbons, both as covalently bound and Van der Waals interdigitated chains.
Effect of chain length, grafting density, temperature and chain interdigitation
were systematically studied. A clear reduction of conductivity was found with
increasing chain length and decreasing grafting density, while lower
conductivity was observed for Van der Waals interdigitated chains compared to
covalently bound ones. The importance of molecular junctions in enhancing
thermal conductance at graphene nanoribbons contacts was further evidenced by
calculating the conductance equivalence between a single chain and an
overlapping of un-functionalized graphene sheets. As an example, one single
pentyl covalently bound chain was found to have a conductance equivalent to the
overlapping of an area corresponding to about 152 carbon atoms. These results
contribute to the understanding of thermal phenomena occurring within networks
of thermally conductive nanoparticles, including graphene nanopapers and
graphene-based polymer nanocomposites, which are or high interest for the heat
management application in electronics and generally in low-temperature heat
exchange and recovery
- …