1,263,628 research outputs found
Model predictive control based on LPV models with parameter-varying delays
© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper presents a Model Predictive Control (MPC) strategy based on Linear Parameter Varying (LPV) models with varying delays affecting states and inputs. The proposed control approach allows the controller to accommodate the scheduling parameters and delay change. By computing the prediction of the state variables and delay along a prediction time horizon, the system model can be modified according to the evaluation of the estimated state and delay at each time instant. Moreover, the solution of the optimization problem associated with the MPC design is achieved by solving a series of Quadratic Programming (QP) problem at each time instant. This iterative approach reduces the computational burden compared to the solution of a non-linear optimization problem. A pasteurization plant system is used as a case study to demonstrate the effectiveness of the proposed approach.Peer ReviewedPostprint (author's final draft
Predictive models for multibiometric systems
Recognizing a subject given a set of biometrics is a fundamental pattern recognition problem. This paper builds novel statistical models for multibiometric systems using geometric and multinomial distributions. These models are generic as they are only based on the similarity scores produced by a recognition system. They predict the bounds on the range of indices within which a test subject is likely to be present in a sorted set of similarity scores. These bounds are then used in the multibiometric recognition system to predict a smaller subset of subjects from the database as probable candidates for a given test subject. Experimental results show that the proposed models enhance the recognition rate beyond the underlying matching algorithms for multiple face views, fingerprints, palm prints, irises and their combinations
Leptogenesis in minimal predictive seesaw models
We estimate the Baryon Asymmetry of the Universe (BAU) arising from
leptogenesis within a class of minimal predictive seesaw models involving two
right-handed neutrinos and simple Yukawa structures with one texture zero. The
two right-handed neutrinos are dominantly responsible for the "atmospheric" and
"solar" neutrino masses with Yukawa couplings to proportional to and , respectively, where
is a positive integer. The neutrino Yukawa matrix is therefore characterised by
two proportionality constants with their relative phase providing a
leptogenesis-PMNS link, enabling the lightest right-handed neutrino mass to be
determined from neutrino data and the observed BAU. We discuss an SUSY
GUT example, where vacuum alignment provides the required Yukawa
structures with , while a symmetry fixes the relatives
phase to be a ninth root of unity.Comment: 16 pages, 2 tables. v2: minor changes, references added, version
accepted in JHE
Complexity in forecasting and predictive models
Te challenge of this special issue has been to know the
state of the problem related to forecasting modeling and
the creation of a model to forecast the future behavior
that supports decision making by supporting real-world applications.
Tis issue has been highlighted by the quality of its
research work on the critical importance of advanced analytical methods, such as neural networks, sof computing,
evolutionary algorithms, chaotic models, cellular automata,
agent-based models, and fnite mixture minimum squares
(FIMIX-PLS).info:eu-repo/semantics/publishedVersio
Marginal and simultaneous predictive classification using stratified graphical models
An inductive probabilistic classification rule must generally obey the
principles of Bayesian predictive inference, such that all observed and
unobserved stochastic quantities are jointly modeled and the parameter
uncertainty is fully acknowledged through the posterior predictive
distribution. Several such rules have been recently considered and their
asymptotic behavior has been characterized under the assumption that the
observed features or variables used for building a classifier are conditionally
independent given a simultaneous labeling of both the training samples and
those from an unknown origin. Here we extend the theoretical results to
predictive classifiers acknowledging feature dependencies either through
graphical models or sparser alternatives defined as stratified graphical
models. We also show through experimentation with both synthetic and real data
that the predictive classifiers based on stratified graphical models have
consistently best accuracy compared with the predictive classifiers based on
either conditionally independent features or on ordinary graphical models.Comment: 18 pages, 5 figure
Sustainable Investing and the Cross-Section of Maximum Drawdown
We use supervised learning to identify factors that predict the cross-section
of maximum drawdown for stocks in the US equity market. Our data run from
January 1980 to June 2018 and our analysis includes ordinary least squares,
penalized linear regressions, tree-based models, and neural networks. We find
that the most important predictors tended to be consistent across models, and
that non-linear models had better predictive power than linear models.
Predictive power was higher in calm periods than stressed periods, and
environmental, social, and governance indicators augmented predictive power for
non-linear models
Predictive Collective Variable Discovery with Deep Bayesian Models
Extending spatio-temporal scale limitations of models for complex atomistic
systems considered in biochemistry and materials science necessitates the
development of enhanced sampling methods. The potential acceleration in
exploring the configurational space by enhanced sampling methods depends on the
choice of collective variables (CVs). In this work, we formulate the discovery
of CVs as a Bayesian inference problem and consider the CVs as hidden
generators of the full-atomistic trajectory. The ability to generate samples of
the fine-scale atomistic configurations using limited training data allows us
to compute estimates of observables as well as our probabilistic confidence on
them. The methodology is based on emerging methodological advances in machine
learning and variational inference. The discovered CVs are related to
physicochemical properties which are essential for understanding mechanisms
especially in unexplored complex systems. We provide a quantitative assessment
of the CVs in terms of their predictive ability for alanine dipeptide (ALA-2)
and ALA-15 peptide
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