61 research outputs found
Про оцінку ймовірності переповнення буферу для мереж зв’язку
In recent years, a large number of research of telecommunications traffic have been conducted. It was found that traffic has a number of specific properties that distinguish it from ordinary traffic. Namely: it has the properties of self-similarity, multifractality, long-term dependence and distribution of the amount of load coming from one source.
At present, many other models of traffic with self-similarity properties and so on have been built in other researched works on this topic. Such models are investigated in this paper, which considers traffic in telecommunications networks, the probability of overflow traffic buffer. Statistical models are built to analyze traffic in telecommunications networks, in particular to research the probability of buffer overflow for communication networks.
The article presents the results of the analysis of processes in telecommunication networks, in particular traffic; research of possibilities of representation of real processes in the form of random processes on the basis of use of statistical simulation model; the necessary mathematical and statistical models are selected and analyzed; software-implemented models using the Matlab environment; visual graphs for comparison of the received data are given; the analysis of the received models is carried out.
Pages of the article in the issue: 64 - 69
Language of the article: UkrainianУ даній статті досліджується трафік у телекомунікаційних мережах, ймовірність переповнення буфера трафіку. Для цього у роботі проаналізовано процеси у телекомунікаційних мережах, зокрема залежності трафіку; проведено дослідження можливостей представлення реальних процесів у вигляді випадкових процесів на основі використання статистичного імітаційного моделювання; підібрано та проаналізовано необхідні математичні, статистичні моделі; програмно реалізовано дані моделі за допомогою середовища Matlab; побудовано необхідні графіки для порівняння отриманих даних; проведено аналіз отриманих моделей
Модифікація атомної структури рідкої евтектики Al0.973Ni0.027 карбоновими нанотрубками
The short-range order structure of the liquid Al0.973Ni0.027 eutectic alloy and eutectic based composites with carbon nanotubes containing 5, 10 and 15% was investigated. The changes of the main structure parameters (interatomic distances, coordination numbers, cluster sizes) was analyzed depending on the nanotubes content and temperature of the composites. As a result of the addition of carbon nanotubes, the atomic structure contracting of the liquid Al0.973Ni0.027 eutectic was revealed.Досліджено структуру ближнього порядку рідкої евтектики Al0.973Ni0.027 та композитів на її основі з вмістом карбонових нанотрубок 5, 10 та 15 об.%. Проаналізовано зміну основних структурних параметрів (міжатомних відстаней, координаційних чисел, розмірів кластера) залежно від вмісту нанотрубок та температури композитів. Виявлено що в результаті додавання карбонових нанотрубок відбувається ущільнення атомної структури рідкої евтектики Al0.973Ni0.027
Use of personal protective equipment
The purpose of the study is to determine whether people know what personal protective equipment they can have and how they can be made from improvised means.Цель исследования – определить, знает ли население, какие средства индивидуальной защиты бывают и как их можно сделать из подручных средств
Chlamydia trachomatis growth inhibition and restoration of LDL-receptor level in HepG2 cells treated with mevastatin
Impact of caloric and dietary restriction regimens on markers of health and longevity in humans and animals: a summary of available findings
Considerable interest has been shown in the ability of caloric restriction (CR) to improve multiple parameters of health and to extend lifespan. CR is the reduction of caloric intake - typically by 20 - 40% of ad libitum consumption - while maintaining adequate nutrient intake. Several alternatives to CR exist. CR combined with exercise (CE) consists of both decreased caloric intake and increased caloric expenditure. Alternate-day fasting (ADF) consists of two interchanging days; one day, subjects may consume food ad libitum (sometimes equaling twice the normal intake); on the other day, food is reduced or withheld altogether. Dietary restriction (DR) - restriction of one or more components of intake (typically macronutrients) with minimal to no reduction in total caloric intake - is another alternative to CR. Many religions incorporate one or more forms of food restriction. The following religious fasting periods are featured in this review: 1) Islamic Ramadan; 2) the three principal fasting periods of Greek Orthodox Christianity (Nativity, Lent, and the Assumption); and 3) the Biblical-based Daniel Fast. This review provides a summary of the current state of knowledge related to CR and DR. A specific section is provided that illustrates related work pertaining to religious forms of food restriction. Where available, studies involving both humans and animals are presented. The review includes suggestions for future research pertaining to the topics of discussion
Optimization of Capital Investment Distribution in an Open Economy on the Basis of the “Input–Output” Model
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