Search results for "parametri"
showing 10 items of 1144 documents
Neural Classification of Compost Maturity by Means of the Self-Organising Feature Map Artificial Neural Network and Learning Vector Quantization Algo…
2019
Self-Organising Feature Map (SOFM) neural models and the Learning Vector Quantization (LVQ) algorithm were used to produce a classifier identifying the quality classes of compost, according to the degree of its maturation within a period of time recorded in digital images. Digital images of compost at different stages of maturation were taken in a laboratory. They were used to generate an SOFM neural topological map with centres of concentration of the classified cases. The radial neurons on the map were adequately labelled to represent five suggested quality classes describing the degree of maturation of the composted organic matter. This enabled the creation of a neural separator classify…
CALIBRATION OF LÉVY PROCESSES USING OPTIMAL CONTROL OF KOLMOGOROV EQUATIONS WITH PERIODIC BOUNDARY CONDITIONS
2018
We present an optimal control approach to the problem of model calibration for L\'evy processes based on a non parametric estimation procedure. The calibration problem is of considerable interest in mathematical finance and beyond. Calibration of L\'evy processes is particularly challenging as the jump distribution is given by an arbitrary L\'evy measure, which form a infinite dimensional space. In this work, we follow an approach which is related to the maximum likelihood theory of sieves. The sampling of the L\'evy process is modelled as independent observations of the stochastic process at some terminal time $T$. We use a generic spline discretization of the L\'evy jump measure and selec…
Solutions with sign information for nonlinear Robin problems with no growth restriction on reaction
2019
We consider a parametric nonlinear Robin problem driven by a nonhomogeneous differential operator. The reaction is a Carathéodory function which is only locally defined (that is, the hypotheses concern only its behaviour near zero). The conditions on the reaction are minimal. Using variational tools together with truncation, perturbation and comparison techniques and critical groups, we show that for all small values of the parameter λ > 0, the problem has at least three nontrivial smooth solutions, two of constant sign and the third nodal.
Common functional component modelling
2005
Functional data analysis (FDA) has become a popular technique in applied statistics. In particular, this methodology has received considerable attention in recent studies in empirical finance. In this talk we discuss selected topics of functional principal components analysis that are motivated by financial data.
Signal processing in photonic crystals and nanostructures
2006
International audience; Optical devices employing photonic crystals and novel nanostructure materials may exhibit useful properties for applications to all-optical signal processing. In this work we analyze as a first example four-wave mixing of polarized beams in photonic crystal fibers. We show that by properly tuning the pump wavelength and the linear dispersion properties of the fiber one may obtain broadband parametric amplification and frequency conversion. Next we consider the in-line periodic amplification of short optical pulses by means of quantum-dot semiconductor optical amplifiers. We show by numerical simulations that pattern-free amplification of a 40 Gbit/s soliton signal at…
Measurement of the average shape of longitudinal profiles of cosmic-ray air showers at the Pierre Auger Observatory
2019
The profile of the longitudinal development of showers produced by ultra-high energy cosmic rays carries information related to the interaction properties of the primary particles with atmospheric nuclei. In this work, we present the first measurement of the average shower profile in traversed atmospheric depth at the Pierre Auger Observatory. The shapes of profiles are well reproduced by the Gaisser-Hillas parametrization within the range studied, for E>10 17.8 eV .A detailed analysis of the systematic uncertainties is performed using ten years of data and a full detector simulation. The average shape is quantified using two variables related to the width and asymmetry of the profile, and …
Quality of service and dynamic scheduling for traffic engineering in next generation networks
2007
Nykyisin Internet-operaattorit tuottavat palveluja, jotka ovat sidoksissa verkon suorituskykyyn. Palvelut tunnistetaan niihin liittyvien parametrien mukaan, jotka jaottelevat pakettiliikenteen verkon solmujen kautta. Näitä parametreja kutsutaan palvelun laaduksi (QoS). Tulevaisuudessa tietoliikenneverkoissa aikakriittinen liikenne, kuten ääntä (IP-puhelut, VoIP) ja videokuvaa sisältävä liikenne tulee lisääntymään. Palvelun laatua tarvitaan takaamaan aikakriittisten liikenteiden toiminta tietoverkoissa.Menetelmät, jotka perustuvat pakettien merkitsemiseen, ovat yksinkertaisia ja skaalautuvia. Jonotusmenettelyjä käytetään takaamaan erityyppisten liikenteiden palvelun laatu. Palvelun laadun tu…
Valutazione dei parametri lattodinamografici sul latte bovino, ovino e caprino congelato
2010
Ohjelmointikielten parametrinvälitysmekanismit
2011
Sandström, Petri Ohjelmointikielten parametrinvälitysmekanismit Jyväskylä: Jyväskylän yliopisto, 2011, 28 s. Tietojenkäsittelytiede, kandidaatintutkielma Ohjaaja: Hirvonen, Pertti Tässä tutkimuksessa tutustutaan ohjelmointikielten parametrinvälitykseen kes-kittyen erilaisten parametrinvälitysmekanismien toimintaan. Tutkimuksen jäl-kimmäisessä osassa selvitetään muutaman uudemman ohjelmointikielen perus-teella parametrinvälityksen tämänhetkistä tilaa. Tutkimus toteutetaan pääasial-lisesti kirjallisuuteen perustuvana katsauksena. Tavoitteena on selvittää, minkä-laisia parametrinvälitysmekanismeja ja parametrinvälityksen semanttisia malle-ja ohjelmointikielten historiassa on kehitetty ja mitä …
Empīriskā ticamības funkcija lineārai regresijai
2015
Bakalaura darbā tiek aplūkota empīriskās ticamības (EL) metode lineārai regresijai ar mērķi konstruēt empīriskās ticamības apgabalu vienfaktora lineārās regresijas koeficientiem. Konstruētie EL ticamības apgabali tiek salīdzināti ar parametriskās ticamības apgabaliem. Darbā tiek arī veikta jaudas analīze simulētiem datiem ar dažādi sadalītiem atlikumiem, kur EL metodes sniegums tiek salīdzināts ar t-testu lineārai un robustai regresijai. Tiek secināts, ka empīriskās ticamības metode ir strādā labi, taču tā ir jūtīga pret izlecēju ietekmi. Empīriskiem ticamības apgabaliem pārsvarā gadījumu nav elipses forma un viennozīmīgs novietojums attiecībā pret parametrisko ticamības apgabalu.