نتایج جستجو برای: location genetic algorithms monte carlo simulation

تعداد نتایج: 1641746  

Journal: :journal of physical & theoretical chemistry 2009
m. monajjemi n. dalili mansour a. kazemi babaheydari m. khaleghian

serum albumin is the most aboundant protein in blood plasma. its two major roles aremaintaining osmotic pressure and depositing and transporting compounds. in this paper,albumin-methanol solution simulation is carried out by three techniques including montecarlo (mc), molecular dynamic (md) and langevin dynamic (ld) simulations. byinvestigating energy changes by time and temperature (between 27...

Journal: :iranian journal of nuclear medicine 0
mohsen hajizadeh saffar medical physics research center, school of medicine, mashhad university of medical sciences, mashhad, iran shabnam oloomi medical physics department, mashhad university of medical science, mashhad, iran peter knoll department of nuclear medicine, wilhelminenspital, vienna, austria hadi taleshi department of medical physics, faculty of medical sciences, tarbiat modares university, tehran, iran

introduction: scattered photon is one of the main defects that degrade the quality and quantitative accuracy of nuclear medicine images. accurate estimation of scatter in projection data of spect is computationally extremely demanding for activity distribution in uniform and non-uniform dense media. methods: the objective of this paper is to develop and validate a scatter correction technique t...

Journal: :The Annals of Applied Statistics 2011

2002
Ingo Wald Thomas Kollig Carsten Benthin Alexander Keller Philipp Slusallek

Interactive graphics has been limited to simple direct illumination that commonly results in an artificial appearance. A more realistic appearance by simulating global illumination effects has been too costly to compute at interactive rates. In this paper we describe a new Monte Carlo-based global illumination algorithm. It achieves performance of up to 10 frames per second while arbitrary chan...

2007
Drew Creal

Bayesian estimation of DSGE models typically uses Markov chain Monte Carlo as importance sampling (IS) algorithms have a difficult time in high-dimensional spaces. I develop improved IS algorithms for DSGE models using recent advances in Monte Carlo methods known as sequential Monte Carlo samplers. Sequential Monte Carlo samplers are a generalization of particle filtering designed for full simu...

2003
Juan G. Lazo Lazo Marco Aurélio C. Pacheco Marley M. B. R. Vellasco Marco A. G. Dias

Abstract A decision to invest in the development of an oil reserve requires an in-depth analysis of several uncertainty factors. Such factors may involve either technical uncertainties related to the size and economic quality of the reserve, or market uncertainties. When a great number of investment alternatives are involved, the task of selecting the best alternative or a decision rule is very...

Journal: :Multiscale Modeling & Simulation 2005
Stefan Wessel Simon Trebst Matthias Troyer

Simulation of the dynamics of nanoscale systems are usually restricted to a purely classical description, which becomes inadequate once technological minimization reaches scales on which quantum mechanical effects become relevant. In this paper we propose a multiscale approach to estimate quantum corrections to such classical descriptions. Quantum fluctuations in a quantum magnet are absorbed i...

Journal: :journal of physical & theoretical chemistry 2008
z. varmaghani f. mollaamin l. pishkar b. khalili hadda

medicinal chemistry depends on many other disciplines ranging from organic chemistry andpharmacology to computational chemistry. typically medicinal chemists use the moststraightforward ways to prepare compounds. the validation of any design project comes from thebiological testing.studies of the binding site of vinblastine by a single cross—linking experiment identified it asbeing between resi...

Journal: :مهندسی قدرت ایران 0
ali saberi noughabi university of birjand, iran nader hatefi torshizi university of birjand, iran hamidreza najafi university of birjand, iran

in this paper, an interval approach is presented to achieve perfect selectivity and maximum sensitivity in distance relay zones, considering uncertainties. for this purpose, first, the uncertainties affecting the settings of the three zones of a distance relay are discussed. then, by using the monte-carlo simulation, the uncertainties are modelled and the impedances seen by the distance relay a...

Journal: :iranian journal of radiation research 0
s.h. mousavie anijdan department of medical physics and engineering, school of medicine, tehran university of medical sciences, tehran, iran a. shirazi department of medical physics and engineering, school of medicine, tehran university of medical sciences, tehran, iran s.r. mahdavi department of medical physics and engineering, school of medicine, tehran university of medical sciences, tehran, iran a. ezzati department of energy engineering, sharif university of technology, tehran, iran b. mofid department of radiation oncology, shahid beheshti university of medical sciences, tehran, iran s. khoei department of medical physics and engineering, school of medicine, tehran university of medical sciences, tehran, iran

background: gold nanoparticles (gnps) have been shown as a good radiosensitizer. in combination with radiotherapy, several studies with orthovoltage x-rays have shown considerable dose enhancement effects. this paper reports the dose enhancement factor (def) due to gnps in 18 megavoltage (mv) beams. materials and methods: different geometrical 50-nm gnps configurations at a concentration of 5 m...

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