Journal of Mathematics, Mechanics and Computer Science最新文献_第7页

Necessary and sufficient conditions for the well-posed solvability of a boundary value problem for a linear loaded hyperbolic equation 线性加载双曲型方程边值问题的适定可解性的充分必要条件

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-12-01 DOI: 10.26577/jmmcs.2021.v112.i4.01

S. Kabdrakhova, O. Stanzhytsky

引用次数: 0

MATHEMATICAL MODEL OF THE EPIDEMIC PROPAGATION WITH LIMITED TIME SPENT IN EXPOSED AND INFECTED COMPARTMENTS 传染病在暴露室和感染室中有限时间内传播的数学模型

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-12-01 DOI: 10.26577/jmmcs.2021.v112.i4.14

O. Turar, Semyon Yakovlevich Serovaisky

{"title":"MATHEMATICAL MODEL OF THE EPIDEMIC PROPAGATION WITH LIMITED TIME SPENT IN EXPOSED AND INFECTED COMPARTMENTS","authors":"O. Turar, Semyon Yakovlevich Serovaisky","doi":"10.26577/jmmcs.2021.v112.i4.14","DOIUrl":"https://doi.org/10.26577/jmmcs.2021.v112.i4.14","url":null,"abstract":"A discrete nonlinear mathematical model of the epidemic development is proposed. It involves dividing the population into eight compartments (susceptible, exposed, asymptomatic, easily sick, hospitalized, critically ill, recovered and deceased). At the same time, the time spent in compartments of exposed and all forms of patients is considered limited. Thus, any person who has been in contact with an infected person, after a while, either gets sick or does not, leaving the exposed compartment, and any patient, over time, for sure, either goes to the group of more severe patients, dies or recovers. This deterministic model is presented in a discrete form and simulates the quantitative change of various groups by day during the spread of the epidemic. It is a transformation of the SEIR model. The article also presents a numerical analysis of the proposed model. The development of the COVID epidemic in Kazakhstan is considered as an example. At the end, forecasts are given based on preliminary data from the first months of quarantine. Various parameters of the model when starting numerical experiments were found based on computational experiments. At the same time, for a given deterministic one, the effect of wavelike changes in the number of infected is observed.","PeriodicalId":423127,"journal":{"name":"Journal of Mathematics, Mechanics and Computer Science","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115924254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A brief overview of modern research of the processes dynamics in unsteady water ows using the shallow water equation 用浅水方程对非定常水过程动力学的现代研究综述

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-12-01 DOI: 10.26577/jmmcs.2021.v112.i4.15

A. Berdyshev, Zh. A. Abdiramanov, Nazgul S. Akhtaeva, Dana Nazarbaevna Blieva

{"title":"A brief overview of modern research of the processes dynamics in unsteady water ows using the shallow water equation","authors":"A. Berdyshev, Zh. A. Abdiramanov, Nazgul S. Akhtaeva, Dana Nazarbaevna Blieva","doi":"10.26577/jmmcs.2021.v112.i4.15","DOIUrl":"https://doi.org/10.26577/jmmcs.2021.v112.i4.15","url":null,"abstract":"In hydrodynamics (hydraulics), there are numerous approaches to solving the problem of water ﬂow dynamics control in river beds and channels, while the results of each methods diﬀer, and estimates of their reliability do not always exist. The shallow water equation (or Saint-Venant’s equations in one-dimensional form) is often used by hydraulic engineers in their practice. Its apparent simplicity and ability to describe well enough the behavior of rivers and ﬂows make it a useful tool for many applications, such as the regulation of navigable rivers and irrigation networks in agriculture. The main direction of research in the ﬁeld of numeric problems described by Saint-Venant equations is the development of numerical methods of computation implemented on super-powerful computers. Development of numerical models of surface water dynamics in the shallow water approximation is actively advancing during the recent years. The article is devoted to a review of mathematical studies of the dynamics of processes in unsteady water ﬂows using diﬀerential equations, as well as an assessment of these approaches from the point of view of the model’s reﬂection of real processes. The work is aimed at analyzing diﬀerent approaches to modeling the dynamics of processes in non-stationary water ﬂows. The objectives of the study include the analysis of scientiﬁc publications with diﬀerent approaches to modeling the shallow water equation, taking into account factors, parameters, and modeling methods. dynamics of unsteady river currents, numerical methods, a system of hyperbolic diﬀerential equations, high-performance computing.","PeriodicalId":423127,"journal":{"name":"Journal of Mathematics, Mechanics and Computer Science","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116645481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

DEVELOPMENT OF A DECISION SUPPORT SYSTEM FOR EVALUATING INVESTMENT PROJECTS TAKING INTO ACCOUNT MULTI-FACTORITY BASED ON THE METHOD OF HIERARCHY ANALYSIS AND GAME THEORY 基于层次分析法和博弈论的多因素投资项目评价决策支持系统的开发

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-12-01 DOI: 10.26577/jmmcs.2021.v112.i4.10

T. Kartbayev, A.A. Turgynbaeva, A. Kerimakym

引用次数: 0

NATURAL LANGUAGE PROCESSING METHODS FOR CONCEPT MAP MINING: THE CASE FOR ENGLISH, KAZAKH AND RUSSIAN TEXTS 概念图挖掘的自然语言处理方法:英语、哈萨克语和俄语文本的案例

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-12-01 DOI: 10.26577/jmmcs.2021.v112.i4.08

A. Nugumanova, A. S. Tlebaldinova, Y. Baiburin, Ye. V. Ponkina

{"title":"NATURAL LANGUAGE PROCESSING METHODS FOR CONCEPT MAP MINING: THE CASE FOR ENGLISH, KAZAKH AND RUSSIAN TEXTS","authors":"A. Nugumanova, A. S. Tlebaldinova, Y. Baiburin, Ye. V. Ponkina","doi":"10.26577/jmmcs.2021.v112.i4.08","DOIUrl":"https://doi.org/10.26577/jmmcs.2021.v112.i4.08","url":null,"abstract":"Concept maps are used for knowledge visualization via representing an input text or domain at the conceptual level. Concept maps reﬂect the systemic relations between key concepts of a text/ domain and thereby contribute to a deeper understanding of text/domain ideas, save time spent on reading and analysis. However, the process of concept maps construction is laborious and time consuming. Currently, there is a lot of research on the idea of automatic generation concept map from natural language texts. The problem has a high practical value, but in theoretical terms, methods for its solution are mainly language-dependent. Such methods require high-quality annotated linguistic resources, which is a serious problem for low-resource languages like Kazakh. In this work, we analyze the issues related to language-dependent approaches and present our experimental work on automatic generating concept maps from English, Kazakh and Russian texts. We use a well-known language-dependent method called ReVerb which was originally developed for English, and on the example of this method we explore the issues that we have encountered in the case of Kazakh and Russian languages.","PeriodicalId":423127,"journal":{"name":"Journal of Mathematics, Mechanics and Computer Science","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116570230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Requirements for symmetric block encryption algorithms developed for software and hardware implementation 为软件和硬件实现开发的对称块加密算法的要求

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-12-01 DOI: 10.26577/jmmcs.2021.v112.i4.12

K. Sakan, N. Kapalova, A. Haumen, O. Suleimenov

引用次数: 0

SOLUTION OF A TWO-DIMENSIONAL BOUNDARY VALUE PROBLEM OF HEAT CONDUCTION IN A DEGENERATING DOMAIN 简并域内二维热传导边值问题的解

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-09-01 DOI: 10.26577/jmmcs.2021.v111.i3.06

N. Gulmanov

引用次数: 0

AN INVERSE PROBLEM OF RECOVERING THE RIGHT HAND SIDE OF 1D PSEUDOPARABOLIC EQUATION 一维伪抛物方程右手边的反演问题

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-09-01 DOI: 10.26577/jmmcs.2021.v111.i3.03

Khanat Kenzhebay

引用次数: 2

SIMULATION OF NUCLEATE BOILING BUBBLE BY THE PHASE-FIELD AND LATTICE BOLTZMANN METHOD 相场和晶格玻尔兹曼法模拟核沸腾气泡

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-09-01 DOI: 10.26577/jmmcs.2021.v111.i3.09

B. Satenova

引用次数: 0

ON REPRESENTATION OF ONE CLASS OF SCHMIDT OPERATORS 一类施密特算子的表示

Journal of Mathematics, Mechanics and Computer Science Pub Date : 2021-09-01 DOI: 10.26577/jmmcs.2021.v111.i3.05

I. Orazov

引用次数: 0