Life Behavior of a System under Discrete Shock Model

We study the life behavior of a system which is subjected to shocks of random magnitudes over discrete time periods. We obtain the survival function and mean time to failure of the system assuming that the sizes of the shocks follow a discrete probability distribution under cumulative and mixed shock models

On Extreme Residual Lives after the Failure of the System

The concept of residual lifetime has attracted considerable research interest in reliability theory. It is useful for evaluating the dynamic behavior of a system. In this paper, we study the extreme residual lives, that is, the minimum and maximum residual lives of the remaining components after the failure of the system. The system is assumed to have an arbitrary structure. We obtain signature-based distributional and ordering results for the extreme residual lives

Consecutive k-within-m-out-of-n:F system with exchangeable components

As a generalization of k-out-of-n:F and consecutive k-out-of-n:F systems, the consecutive k-within-m-out-of-n:F system consists of n linearly ordered components such that the system fails iff there are m consecutive components which include among them at least k failed components. In this article, the reliability properties of consecutive k-within-m-out-of-n:F systems with exchangeable components are studied. The bounds and approximations for the survival function are provided. A Monte Carlo estimator of system signature is obtained and used to approximate survival function. The results are illustrated and numerics are provided for an exchangeable multivariate Pareto distribution

Consecutive k-within-m-out-of-n:F system with exchangeable components

As a generalization of k-out-of-n:F and consecutive k-out-of-n:F systems, the consecutive k-within-m-out-of-n:F system consists of n linearly ordered components such that the system fails iff there are m consecutive components which include among them at least k failed components. In this article, the reliability properties of consecutive k-within-m-out-of-n:F systems with exchangeable components are studied. The bounds and approximations for the survival function are provided. A Monte Carlo estimator of system signature is obtained and used to approximate survival function. The results are illustrated and numerics are provided for an exchangeable multivariate Pareto distribution

Üç katmanlı süzgeç öbekleri ile plaka çıkarma işlemi (Extracting license plates from images with 3-tier filter banks)

The purpose of this project is to extract the license plates from images which are taken from a camera system. Nowadays, there are many different applied methods which deal the problem of extracting plates. In this paper, the images are processed with 3- tier filter bank and successful results are taken. Gabor filters which have band-pass characteristics are preferred as filter bank. Instead of single filtering, 3-tier filtering system with different variances are applied

CAN HOMEOPATHY BE A "REMEDY" FOR LOSS OF SMELL AND TASTE IN PATIENTS WITH COVID-19?

Background: Homeopathy is applied as a supportive in the treatment of viral infections and in relieving their symptoms. Objective: To create an awareness that effective remedial results can be obtained by homeopathy in patients with loss of smell and taste in Coronavirus Disease 2019. Methods: A prospective, cohort and randomized study was conducted. The main inclusion criterion was the loss of smell and taste for at least one week. Homeopathic remedies were also applied as supportive therapy. Visual Analog Scale (VAS) was used to evaluate the loss of smell and taste perception before and after treatment. Results: A total of 30 patients, 32.17±10.25 years, were included in the study. The mean pre-treatment VAS-smell perception of the patients was 0.67±1.24, while the mean VAS-taste perception was 2.57±3.01. After the treatment, the mean of VAS-smell perception was 8.67±1.92, while the mean of VAS-taste increased to 9.43±1.22. There was a strong positive correlation between ΔVAS-smell perception and ΔVAS-taste perception (r: 0.563, p: 0.001). There was also a strong negative correlation between ΔVAS-taste perception and the level of ferritin (r: -0.552, p: 0.002). Conclusion: The present study on the effective improvement via homeopathy treatment in patients with loss of smell and taste in COVID-19 that “has spoiled the taste of life and living” should be supported by further studies

Consecutive -within--out-of-:F System with Nonidentical Components

As a generalisation of consecutive -out-of-:F and -out-of-:F system models, a consecutive -within--out-of-:F system consists of linearly ordered components and fails if and only if there are consecutive components which include among them at least failed components. In this paper, we study the survival function of a consecutive -within--out-of-:F system consisting of independent but nonidentical components. We obtain exact expressions for the survival function when 2≥. A detailed analysis for consecutive 2-within--out-of-:F systems is presented and the asymptotic behaviour of hazard rate of these systems is investigated using mixture representations

On Stress-Strength Reliability with a Time-Dependent Strength

The study of stress-strength reliability in a time-dependent context needs to model at least one of the stress or strength quantities as dynamic. We study the stress-strength reliability for the case in which the strength of the system is decreasing in time and the stress remains fixed over time; that is, the strength of the system is modeled as a stochastic process and the stress is considered to be a usual random variable. We present stochastic ordering results among the lifetimes of the systems which have the same strength but are subjected to different stresses. Multicomponent form of the aforementioned stress-strength interference is also considered. We illustrate the results for the special case when the strength is modeled by a Weibull process

On system reliability in stress-strength setup

In this paper we study stress-strength reliability for a general coherent system. The exact expression as well as bounds and approximations for system reliability are presented. We also illustrate the estimation procedure for exponential stress-strength distributions.