medical linear accelerators are one of the most widespread methods for cancer treatment. despite their advantages, unwanted photoneutrons are produced by high energy linacs. this photoneutrons are as undesired doses to patients and a significant problem for radiation protection of the staffs and patients. photoneutrons radiological risk must be evaluated because of their high let and range.in o...

background: it is now well-demonstrated that histone demethylases play an important role in developmental controls, cell-fate decisions, and a variety of diseases such as cancer. lysine-specific demethylase 5d (kdm5d) is a male-specific histone demethylase that specifically demethylates di- and tri-methyl h3k4 at the start site of active genes. in this light, the aim of this study was to invest...

background: latent adenocarcinoma of prostate refers to cases who present no obvious sign or symptom during their life spans and the tumor is incidentally found at postmortem examination. its frequency can be very important in epidemiologic investigations, prevention and treatment. no previous study has been done in this regard in iran and the studies performed in other countries show various r...

this paper proposes a hybrid method to find cumulative distribution function (cdf) of completion time of gert-type networks (gtn) which have no loop and have only exclusive-or nodes. proposed method is cre-ated by combining an analytical transformation with gaussian quadrature formula. also the combined crude monte carlo simulation and combined conditional monte carlo simulation are developed a...

Monte Carlo is one of the most versatile and widely used numerical methods. Its convergence rate, O(N~^), is independent of dimension, which shows Monte Carlo to be very robust but also slow. This article presents an introduction to Monte Carlo methods for integration problems, including convergence theory, sampling methods and variance reduction techniques. Accelerated convergence for Monte Ca...

results in a total of 40 sporadic prostate cancer and 80 benign prostatic hyperplasia cases, no xmrv was detected by real-time pcr and nested-pcr. rnase l r462q polymorphism analysis reveals that although there was an increase in the risk of prostate cancer correlated with the q/q allele of rnase l at position 462, the frequencies of the rnase l r462q alleles were not statistically significant ...

This paper surveys recent research on using Monte Carlo techniques to improve quasi-Monte Carlo techniques. Randomized quasi-Monte Carlo methods provide a basis for error estimation. They have, in the special case of scrambled nets, also been observed to improve accuracy. Finally through Latin supercube sampling it is possible to use Monte Carlo methods to extend quasi-Monte Carlo methods to hi...

monte carlo simulation is a standard technique for project risk analysis. however, some assumptions of this technique are not reasonable in real world. when a project falls behind the schedule, managers take actions to improve the performance. nevertheless, most of the simulation models as monte carlo omit these reactions in their analysis, which results in unreasonable wide distributions or ev...

normal 0 false false false en-us x-none ar-sa background: prostate cancer is one of the most common cancer types both in western and eastern countries, involving mostly elder men. the mechanisms underlying the prostate cancer development remain unclear. prostate-specific antigen (psa) is the only well accepted marker for prostate cancer diagnosis and prognosis. the diagnosis and treatment of pr...