background: as bremsstrahlung photon beam fluence is important parameter to be known in a photonuclear reaction experiment as the number of produced particle is strongly depends on photon fluence. materials and methods: photon production yield from different thickness of aluminum target has been estimated using artificial neural network (ann) model. target thickness and incoming electron energy...

Multivariate gamma distribution finds abundant applications in stochastic modelling, hydrology and reliability. Parameter estimation in this distribution is a challenging one as it involves many parameters to be estimated simultaneously. In this paper, the form of multivariate gamma distribution proposed by Mathai and Moschopoulos [9] is considered. This form has nice properties in terms of mar...

Two simple algorithms to generate gamma random numbers are proposed in this article. Both algorithms use the ratio-of-uniforms method and are based on logarithmic transformations of the gamma random variable. One algorithm applies to all positive shape parameter value without limitation. It has good performance compared with other existing algorithms for both shape parameter values greater than...

This paper proposes a software reliability model (SRM) based on a mixed gamma distribution, so-called the mixed gamma SRM. In addition, we develop the parameter estimation method for the mixed gamma SRM. Concretely, the estimation method is based on the Bayesian estimation and the parameter estimation algorithm is described by MCMC (Markov chain Monte Carlo) method with grouped data.

We investigate a class of prior models, called Gamma chains, for modelling depedicies in time-frequencyrepresentations of signals. We assume transform coefficients are drawn independently from Gaussians wherethe latent variances are coupled using Markov chains of inverse Gamma random variables. Exact inference isnot feasible but this model class is conditionally conjugate, so st...

A new method of the perturbed angular gamma-gamma-correlation (PAC) measurements was developed using one HPGe detector only (1-PAC). For quantifying the perturbation factor, the ratio R gamma 1 + gamma 2 of the summing peak composed of two cascade gamma-rays (the perturbation-affected parameter) to the summing peak composed of one gamma-ray and one X-ray (the perturbation non-affected parameter...

Background: The commissioning accuracy of Volumetric Modulated Arc Therapy (VMAT) need to be evaluated.Objective: To test and evaluate commissioning accuracy of VMAT based on the TG 119 protocols at local institution. Material and Methods: The phantom, structure sets, VMAT and IMRT beam parameter setup, dose prescriptions and planning objectives were following TG 119 guidelines to c...

We propose two approximate methods (one based on parsimony and one on pairwise sequence comparison) for estimating the pattern of nucleotide substitution and a parsimony-based method for estimating the gamma parameter for variable substitution rates among sites. The matrix of substitution rates that represents the substitution pattern can be recovered through its relationship with the observabl...

The method of higher-order L-moments (LH-moment) was proposed as a more robust alternative compared to classical characterize extreme events. new derivation will be done for Mielke-Johnson’s Kappa and Three-Parameters Type-II (K3D-II) distributions based on the LH-moments approach. data maximum monthly rainfall Embong station in Terengganu were used case study. analyses conducted using with η=0...