Search results for "Markov"
showing 10 items of 628 documents
Markova ķēžu pielietojums latviešu valodas vārdnīcas kontekstā
2021
Lai pētītu Markova ķēžu pielietojumu latviešu valodas vārdnīcas kontekstā,tiek izveidots uz Markova ķēdēm balstīts modelis, kas aprēķina latviešu literārāsvalodas vārdnīcā iekļauto vārdu varbūtību parādīties tekstā. Iegūtās varbūtībastiek salīdzinātas ar reālām vērtībām, kas iegūtas no diviem dažādiem apkopototekstu korpusiem. Pētīšanas procesā tiek veikts aprēķins vidējām vērtībām, kāarī vidējām relatīvām kļūdām. Tiek analizēta vārdam piemītošo īpašību ietek-me uz iegūtās varbūtības precizitāti. Tiek noteikts vārdu tips, kam izmantotāmetode dod labākos rezultātus. Darbā aprakstītas Markova ķēdes un to papla-šinātā modeļu klase, doti piemēri. Tiek iegūts latviešu valodas alfabēta sākumavarb…
Decoherence without entanglement and quantum Darwinism
2020
It is often assumed that decoherence arises as a result of the entangling interaction between a quantum system and its environment, as a consequence of which the environment effectively measures the system, thus washing away its quantum properties. Moreover, this interaction results in the emergence of a classical objective reality, as described by quantum Darwinism. In this Rapid Communication, we show that the idea that entanglement is needed for decoherence is imprecise. We propose a dynamical mixing mechanism capable of inducing decoherence dynamics on a system without creating any entanglement with its quantum environment. We illustrate this mechanism by introducing a simple and exactl…
Gradient walks and $p$-harmonic functions
2017
Studentu augstākās izglītības mācību procesa analīze izmantojot Markova ķēdes
2020
Bakalaura darbā apskatīta Markova modeļu teorija ar absorbējošiem stāvokļiem, ar mērķi šos modeļus pielietot izglītības datu analīzei. Tiek izmantoti Latvijas Universitātes Fizikas, Matemātikas un Optomerijas fakultātes studentu mācību ilguma dati par studentiem, kas fakultātē iestājušies no 2006.gada līdz 2016.gadam. Tika pielāgoti fakultātes programmām atbilstoši Markova modeļi, ar kuru palīdzību analizēts studentu mācību progress, aprēķināts, cik liela daļa studentu pabeidz studijas. Tika veikti secinājumi, kādi ir lielākie šķēršļi absolvēt un ko studiju organizēšanā varētu uzlabot.
A Stochastic Decision Process Model for Optimization of Railway and Tramway Track Maintenance by means of Image Processing Technique
2013
One of the key targets for an efficient transport network management is the search for proper maintenance policies to guarantee acceptable safety and quality standards in the travel and to optimize available resource allocation. Methodologically, the proposed model presented in this paper uses the stochastic dynamic programming and in particular Markov decision processes applied to the rail wear conditions for the railway and tramway network. By performing the integrated analysis of the classes of variables which characterize the rail quality (in terms of safety), the proposed mathematical approach allows to find the solutions to the decision-making process related to the probability of det…
Validating Habitual and Goal-Directed Decision-Making Performance Online in Healthy Older Adults
2021
Everyday decision-making is supported by a dual-system of control comprised of parallel goal-directed and habitual systems. Over the past decade, the two-stage Markov decision task has become popularized for its ability to dissociate between goal-directed and habitual decision-making. While a handful of studies have implemented decision-making tasks online, only one study has validated the task by comparing in-person and web-based performance on the two-stage task in children and young adults. To date, no study has validated the dissociation of goal-directed and habitual behaviors in older adults online. Here, we implemented and validated a web-based version of the two-stage Markov task usi…
Segmentazione del mercato del lavoro ed acquisizione di capitale umano: un'applicazione delle catene di Markov
2001
Modeling TDS data and segmenting consumers thanks to a mixture of semi-Markov processes
2018
International audience
Simuloidun jäähdytyksen suppenemislause
2013
Tämä pro gradu -tutkielma käsittelee simuloitu jäähdytys -nimisen kombinatorisen optimointimenetelmän teoriaa ja käytäntöä. Esimerkiksi kuvankäsittelyssä sovelletun algoritmin ideana on löytää annetulla joukolla määritellyn reaaliarvoisen energiafunktion globaali minimikohta sallimalla - ei pelkästään energiaa vähentäviä - vaan myös energiaa kasvattavia siirtymiä lähtöjoukon alkioiden välillä. Tilastolliseen fysiikkaan analogian omaavan, Gibbsin jakauman ominaisuuksiin pohjautuvan menetelm än matemaattisena perustana toimivat epähomogeeniset Markovin ketjut, joiden suppenemista tarkastellaan Dobrushinin kontraktiokerroinmenetelmän avulla. Simuloidun jäähdytyksen suppenemislause, joka takaa …
Bayesian temporal and spatio-temporal Markov switching models for the detection of influenza outbreaks
2017
Influenza is a disease which affects millions of people every year and causes hundreds of thousends of deads every year. This disease causes substantial direct and indirect costs every year. The influenza epidemic have a particular behavior which shapes the statistical methods for their detection. Seasonal epidemics happen virtually every year in the temperate parts of the globe during the cold months and extend throughout whole regions, countries and even continents. Besides the seasonal epidemics, some nonseasonal epidemics can be observed at unexpected times, usually caused by strains which jump the barrier between animals and humans, as happened with the well known Swine Flu epidemic, w…