Search results for "penalty"
showing 10 items of 56 documents
Solving some optimal control problems using the barrier penalty function method
2005
In this paper we present a new approach to solve the two-level optimization problem arising from an approximation by means of the finite element method of optimal control problems governed by unilateral boundary value problems. The minimized functional depends on control variables and state variables x. The latter are the optimal solution of an auxiliary quadratic programming problem, whose parameters depend on u.
A penalized approach to covariate selection through quantile regression coefficient models
2019
The coefficients of a quantile regression model are one-to-one functions of the order of the quantile. In standard quantile regression (QR), different quantiles are estimated one at a time. Another possibility is to model the coefficient functions parametrically, an approach that is referred to as quantile regression coefficients modeling (QRCM). Compared with standard QR, the QRCM approach facilitates estimation, inference and interpretation of the results, and generates more efficient estimators. We designed a penalized method that can address the selection of covariates in this particular modelling framework. Unlike standard penalized quantile regression estimators, in which model selec…
Differential geometric least angle regression: a differential geometric approach to sparse generalized linear models
2013
Summary Sparsity is an essential feature of many contemporary data problems. Remote sensing, various forms of automated screening and other high throughput measurement devices collect a large amount of information, typically about few independent statistical subjects or units. In certain cases it is reasonable to assume that the underlying process generating the data is itself sparse, in the sense that only a few of the measured variables are involved in the process. We propose an explicit method of monotonically decreasing sparsity for outcomes that can be modelled by an exponential family. In our approach we generalize the equiangular condition in a generalized linear model. Although the …
Investigation of data encryption impact on broadcasting visible light communications
2014
Este trabajo investiga el impacto de la encriptación y desencriptación de datos en un sistema de comunicaciones de luz visible (VLC) de difusión en interiores incrustado en la capa física. Se ha implementado el cifrado RSA para proporcionar una transmisión de datos segura en la capa física. El artículo muestra el rendimiento de la tasa de error de bits (BER) para los sistemas VLC seguros y no seguros (8 y 12 bits) para velocidades de datos de 2 y 12 Mbps. Para una BER de 10e-4 mostramos que hay penalizaciones de potencia de 2-4 dB con las VLC seguras. También se investiga el impacto de la longitud de la clave en la propagación del error y la penalización de potencia. EU Cost Action IC1101 T…
Variable selection with unbiased estimation: the CDF penalty
2022
We propose a new SCAD-type penalty in general regression models. The new penalty can be considered a competitor of the LASSO, SCAD or MCP penalties, as it guarantees sparse variable selection, i.e., null regression coefficient estimates, while attenuating bias for the non-null estimates. In this work, the method is discussed, and some comparisons are presented.
Variable Selection with Quasi-Unbiased Estimation: the CDF Penalty
2022
We propose a new non-convex penalty in linear regression models. The new penalty function can be considered a competitor of the LASSO, SCAD or MCP penalties, as it guarantees sparse variable selection while reducing bias for the non-null estimates. We introduce the methodology and present some comparisons among different approaches.
Wage penalties for post-secondary education interruption in France
2017
International audience; In France, more and more young people are interrupting their post-secondary education (Mora, 2014) even if re-entering higher education implies all kinds of costs. Yet, little attention has been given so far to the eect of temporary dropout on future wages but it has been studied in other countries. We have attempted to measure the net effect of schooling discontinuities on young wages on the basis of a study of a sample of youth who left post-secondary education in 1998 and returned a few years later. Firstly, from an OLS regression, temporary interruption seems to have a positive effect on wages. However, people who interrupted temporary their education could have …
La peine de mort dans l'Encyclopédie et ses Suppléments
2012
This is a study of Montesquieu's and Beccaria's views on the right to apply death punishment as stated in the great Encyclopedia and in the Supplements. Without providing any unique answer to the question whether society may claim the right of life and death, the encyclopaedists reconsidered and diffused the reformism of the major authors of the eighteenth-century legal culture, thus promoting a societal justice before the Revolution.
Illuminismo e giustizia penale. Il caso della ghigliottina
2011
International audience; A mechanical daughter of the enlightenment, the guillotine remains a frightening symbol of its dialectic. Being one of the most troubling inventions of utilitarian rationalism in modern europe, it meets the expectations of equality, secularism, and humanity of the legal culture of Philosophes. Focusing on the texts and contexts of the institution of this lethal machine in the administration of justice, this article examines the anthropological sense and the political dimension of the recourse to the machine. Is the mechanization of capital punishment a step forward in the humanization of social relations or the entry in the era of technical inhumanity? In this ambigu…