oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 2 )

2018 ( 4 )

2016 ( 1 )

2015 ( 31 )

Custom range...

Search Results: 1 - 10 of 2008 matches for " Osvaldo Agamennoni "
All listed articles are free for downloading (OA Articles)
Page 1 /2008
Display every page Item
Attraction and Stability of Nonlinear Ode's using Continuous Piecewise Linear Approximations
Andres Garcia,Osvaldo Agamennoni
Mathematics , 2010,
Abstract: In this paper, several results concerning attraction and asymptotic stability in the large of nonlinear ordinary differential equations are presented. The main result is very simple to apply yielding a sufficient condition under which the equilibrium point (assuming a unique equilibrium) is attractive and also provides a variety of options among them the classical linearization and other existing results are special cases of the this main theorem in this paper including and extension of the well known Markus-Yamabe conjecture. Several application examples are presented in order to analyze the advantages and drawbacks of the proposed result and to compare such results with successful existing techniques for analysis available in the literature nowadays.
Closed-Form Trajectories of the Unicycle
Andres Garcia,Osvaldo Agamennoni,Jose Figueroa
Mathematics , 2009,
Abstract: This paper presents a methodology to stabilize some kind of Nonlinear Control system known as Driftless, utilizing the concept of \textit{Pseudo-Kinetic Energy} introduced in this work. Once this controller is applied to the Unicycle-type robot, stability is guaranteed with the salient property that the structure of the controller allows to solve in closed-form the trajectories of the vehicle. While the proposed controller only ensures stability (not asymptotic stability) the obtained closed-form solutions will show a path to obtain in closed form the solutions for the general control problem of the unicycle. Some conclusions and future directions for research are also depicted.
From Norman Mailer to Matthew Barney. The post human myth of Gary Gilmore Da Norman Mailer a Matthew Barney. Il mito post-umano di Gary Gilmore
Francesca Agamennoni
Between , 2012,
Abstract: Gary Gilmore, a murderer who was condamned to death in the USA in 1976, gained international notoriety thanks to his decision to accept and encourage his death sentence, refusing every kind of juridical appeal, surprisingly turning his own execution into a public and intentional suicide. For its power to make American institutions wonder about ethical and political problems, like the legitimacy of death penalty or the relationship between individual freedom and public law, this case inspired in 1979 The Executioner's Song, a non-fiction novel by Norman Mailer. about twenty years later Gilmore became a character of The Cremaster Cycle, one of the most important works by the american video-artist Matthew Barney, who based the plot of his Cremaster 2 (the second episode of this five-movie saga) on Mailer's novel. The comparison between Cremaster 2 and its literary model will provide an example of the transformation of a story between different artistic languages, but also between different historical and cultural backgrounds: in the post human era the story of Gary Gilmore has lost most of its political and ethical meanings becoming a symbol of the struggle between human willingness and biological destiny. Gary Gilmore, un assassino condannato a morte negli Stati Uniti nel 1976, guadagnò notorietà internazionale per la sua decisione di accettare la propria sentenza di morte, rifiutando ogni tipo di commutazione o ricorso in appello, trasformando paradossalmente la sua esecuzione in una sorta di suicidio pubblico e intenzionale. Per la sua capacità di interrogare le istituzioni americane su problemi politici ed etici, come la legittimità della pena di morte o il rapporto tra legge e libertà individuale, questo caso ha ispirato nel 1979 il non-fiction novel di Norman Mailer The Executioner's Song. Circa vent'anni dopo Gilmore è diventato un personaggio del Cremaster Cycle, una delle opere più importanti del video-artista americano Matthew Barney, che ha basato la trama di Cremaster 2 (secondo episodio di una saga di cinque film) sull'opera di Mailer. Il confronto tra Cremaster 2 e il suo modello letterario fornirà dunque un esempio della trasformazione di una storia nel passaggio tra codici artistici diversi ma anche tra diversi momenti storici e culturali: nell'era del post human la storia di Gilmore, perso gran parte del suo significato politico ed etico, è diventata il simbolo della lotta tra volontà umana e destino biologico.
Improved dynamic window approach by using Lyapunov stability criteria
Berti,H.; Sappa,A. D.; Agamennoni,O. E.;
Latin American applied research , 2008,
Abstract: this paper presents improvements over the dynamic window approach (i-dwa), used for computing in real time autonomous robot navigation. a novel objective function that includes lyapunov stability criteria is proposed. it allows to guarantee a global and asymptotic convergence to the goal avoiding collisions and resulting in a more simple and self-contained approach. experimental results with simulated and real environments are presented to validate the capability of the proposed approach. additionally, comparisons with the original dwa are given.
A new approach to Wiener-like modeling
Castro,L. R.; Agamennoni,O. E.; D'Attellis,C. E.;
Latin American applied research , 2003,
Abstract: in this paper we propose a wiener-like approximation scheme that uses rational wavelets for the linear dynamical structure and orthonormal high level canonical piecewise linear functions for approximating the nonlinear static part. this structure allows to approximate anynonlinear, time-invariant, causal dynamic systems with fading memory and has the following advantages: capability of time-frequency location, design of the linear dynamic part taking into account the a priori knowledge of the system, and minimum number of parameters of orthonormal high level canonical piecewise linear functions determined straightforwardly.
An NIIR structure using HL CPWL functions
Castro,L. R.; Figueroa,J. L.; Agamennoni,O. E.;
Latin American applied research , 2005,
Abstract: in this paper we present a nonlinear infinite impulse response (niir) model structure for black-box identification of nonlinear dynamic systems. the proposed model structure allows the implementation of an identification algorithm in which the degrees of freedom of the nonlinear output error (noe) model can be easily increased or decreased during the identification process. this property is very attractive to find the appropriate niir model, avoiding overfitting. this is done using high level canonical piecewise linear (hl cpwl) functions with an increasing (decreasing) grid division. therefore, the algorithm may start using a linear estimation of the model. the parameters of the hl cpwl functions are updated using a simple algorithm based on a modified steepest descent method with an independently adaptive learning rate.
A new approach to Wiener-like modeling
L. R. Castro,O. E. Agamennoni,C. E. D'Attellis
Latin American applied research , 2003,
Abstract: In this paper we propose a Wiener-like approximation scheme that uses Rational Wavelets for the linear dynamical structure and Orthonormal High Level Canonical Piecewise Linear functions for approximating the nonlinear static part. This structure allows to approximate anynonlinear, time-invariant, causal dynamic systems with fading memory and has the following advantages: capability of time-frequency location, design of the linear dynamic part taking into account the a priori knowledge of the system, and minimum number of parameters of Orthonormal High Level Canonical Piecewise Linear functions determined straightforwardly.
An NIIR structure using HL CPWL functions
L. R. Castro,J. L. Figueroa,O. E. Agamennoni
Latin American applied research , 2005,
Abstract: In this paper we present a nonlinear infinite impulse response (NIIR) model structure for black-box identification of nonlinear dynamic systems. The proposed model structure allows the implementation of an identification algorithm in which the degrees of freedom of the Nonlinear Output Error (NOE) model can be easily increased or decreased during the identification process. This property is very attractive to find the appropriate NIIR model, avoiding overfitting. This is done using High Level Canonical Piecewise Linear (HL CPWL) functions with an increasing (decreasing) grid division. Therefore, the algorithm may start using a linear estimation of the model. The parameters of the HL CPWL functions are updated using a simple algorithm based on a modified steepest descent method with an independently adaptive learning rate.
Improved dynamic window approach by using Lyapunov stability criteria
H. Berti,A. D. Sappa,O. E. Agamennoni
Latin American applied research , 2008,
Abstract: This paper presents improvements over the Dynamic Window Approach (I-DWA), used for computing in real time autonomous robot navigation. A novel objective function that includes Lyapunov stability criteria is proposed. It allows to guarantee a global and asymptotic convergence to the goal avoiding collisions and resulting in a more simple and self-contained approach. Experimental results with simulated and real environments are presented to validate the capability of the proposed approach. Additionally, comparisons with the original DWA are given.
The Precise Determination of Mass through the Oscillations of a Very High-Q Electromechanical System  [PDF]
Osvaldo F. Schilling
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.53015
Abstract:

The present paper is based upon the fact that if an object is part of a highly stable oscillating system, it is possible to obtain an extremely precise measure for its mass in terms of the energy trapped in the system, rather than through a ratio between force and acceleration, provided such trapped energy can be properly measured. The subject is timely since there is great interest in Metrology on the establishment of a new electronic standard for the kilogram. Our contribution to such effort includes both the proposal of an alternative definition for mass, as well as the description of a realistic experimental system in which this new definition might actually be applied. The setup consists of an oscillating type-II superconducting loop subjected to the gravity and magnetic fields. The system is shown to be able to reach a dynamic equilibrium by trapping energy up to the point it levitates against the surrounding magnetic and gravitational fields, behaving as an extremely high-Q spring-load system. The proposed energy-mass equation applied to the electromechanical oscillating system eventually produces a new experimental relation between mass and the Planck constant.

Page 1 /2008
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.