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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML> <HEAD> <TITLE>Journal</TITLE> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" href="css/core.css" type="text/css" />  <script src="js/jquery-1.3.2.js" type="text/javascript"></script> <script src="js/jquery.blink.js"></script> <script src="js/jquery.validate.js" type="text/javascript"></script> <script src="js/cmxforms_az.js" type="text/javascript"></script>  <script type="text/javascript" src="js/jMenu.js"></script> </HEAD> <BODY topmargin="0" leftmargin="0" cellspacing="0" cellpadding="0" marginHeight=0 marginWidth=0 bottommargin="0" rightmargin="0"> <table width="1000" border="0" height="235" cellspacing="0" cellpadding="0" align="center" background="images/header.jpg"> <tr> <td width="680" valign="top"> <div class="menu"> <a href="view.php?lang=az&menu=0">Home</a><a href="view.php?lang=az&menu=2">Editorial Board</a><a href="view.php?lang=az&menu=12">Aims and Scope</a><a href="view.php?lang=az&menu=3">Abstracting and Indexing</a><a href="view.php?lang=az&menu=5">Information for Authors</a><a href="view.php?lang=az&menu=11">Submit Online</a><a href="view.php?lang=az&menu=4">Subscription </a><a href="view.php?lang=az&menu=8">Current Issue</a><a href="view.php?lang=az&menu=9">Copyright Information</a><a href="view.php?lang=az&menu=6">All Issues</a><a href="view.php?lang=az&menu=10">Contacts</a> </div> </td> <td width="285" valign="top" class="authblock"> <script> function trim(str) { return str.replace(/^\s+|\s+$/g,''); } function check_form(myForm) { if (trim(myForm.login.value) == '') { alert("Please enter the name of the user."); myForm.login.focus(); return false; } else if (trim(myForm.pass.value) == '') { alert("Please enter your password."); myForm.pass.focus(); return false; } else { return true; } } dom = (document.getElementById)? true : false; ie4 = (document.all && !dom)? true : false; </script> <form name="login_form" method="POST" onSubmit="return check_form(this);"> <div class="registration"><A HREF="view.php?lang=az&menu=register">New user</A></div> <table cellspacing="0" cellpadding="0" border="0"> <tr> <td> <table cellpadding="0" border="0" style="margin-top: -4px;"> <tr><td height="6"></td></tr> <tr> <td colspan="2"><B>Authorization</B></td> </tr> <tr><td height="6"></td></tr> <tr> <td><label for="username">Username:</label></td><td><input name="login" type="text" value="" maxlength="20" tabindex="1"></td> <td rowspan="2"><BR><input name="submit_login" type="submit" id="submit" value="Login" class="login-button" tabindex="3"></td> </tr> <tr> <td><label for="password">Password:</label></td><td><input name="pass" type="password" value="" maxlength="20" tabindex="2"></td> </tr> <tr> <td></td><td style="padding: 3px 0 0 4px;"><label for="password"><a href="view.php?lang=az&menu=recovery">Forgot password?</a></label></td> </tr> </table> </td> </tr> </table> </div> </form> </td> <td width="30" class="lang" style="padding-top:50px;"><A href="view.php?lang=az&menu=0"><IMG src="images/home.gif" width="29" height="15" border="0"></A><A href="view.php?lang=az&menu=map"><IMG src="images/sitemap.gif" width="29" height="15" border="0"></A><A href="view.php?lang=az&menu=contacts"><IMG src="images/feedback.gif" width="29" height="15" border="0"></A></td> <td width="22" class="lang"> </td> </tr> </table> <BR> <table width="1000" border="0" cellspacing="0" cellpadding="0" align="center"> <tr> <td width="634" valign="top" class="centerbg"> <h1 class="headname">Journal</h1><div class="section-name"><h1><span>Volume 21, №1</span></h1></div> <div class="welcome"> </div><div class="cover"></div><div class="clear"></div>  <div id="news"><strong>Estimation and Prediction Dynamics of the Spread of the Coronavirus Infection Using Minimax Approximation Criterion and Polynomial Splines (pages: 101-117) <br><em>A.M. Abbasov<sup>1,2</sup>, Z.F. Mamedov<sup>2</sup>, M. Tvaronavičienė<sup>3.4</sup>, A. Borodin<sup>2,5</sup>, I.Y. Vygodchikova<sup>6</sup>, A.A. Aliev<sup>5</sup></em><br><a style="font-size:12px !important;color: #299cd3;line-height: 2;"><img src="/images/doi.png" style="height: 14px;margin-top: 4px;">10.30546/1683-6154.21.1.2022.101</a></strong><br><br><sup style="text-align: justify;">1</sup><span style="text-align: justify;">Institute of Control Systems of ANAS, Baku, Azerbaijan</span> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><o:p></o:p></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><sup>2</sup>Azerbaijan State University of Economics, Baku, Azerbaijan<o:p></o:p></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><sup>3</sup>Vilnius Gediminas Technical University (Vilnius Tech.), Vilnius, Lithuania <o:p></o:p></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><sup>4</sup>Institute of Humanities and Social Sciences, Daugavpils University, Daugavpils, Latvia <o:p></o:p></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><sup>5</sup>Plekhanov Russian University of Economics, Moscow, Russia<o:p></o:p></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><sup>6</sup>National Research Saratov State University named after N.G. Chernyshevsky, Saratov, Russia<b style="mso-bidi-font-weight:
normal"><o:p></o:p></b></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><b style="mso-bidi-font-weight:normal"><o:p> </o:p></b></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><b style="mso-bidi-font-weight:normal"><br /> Abstract.</b> Presented methodology is on the spread of coronavirus infection dynamics using minimax criterion with the spline approximation. The study is based at authors mathematical method of approximation the dynamic series. The fundamental difference from classical problem of Chebyshev (1854) is the introduction of limiting conditions that allow joining splines in minimax optimality criterion mode. The approximation model is improved as a result of hierarchical procedure, at each stage of which new spline is attached. In the experiments used data on the spread of the coronavirus infection in Russia for period of more than a year with daily registration of cases of infection. So, quadratic approximation function is obtained with a negative coefficient at the highest degree of the variable, indicating a sharp decrease in the spread of coronavirus infection in Russia since mid-January 2021. <o:p></o:p></p> <p class="MsoNormal" style="text-align:justify;mso-layout-grid-align:none;
text-autospace:none"><o:p> </o:p></p> <p class="MsoNormal" style="mso-layout-grid-align:none;text-autospace:none"><b style="mso-bidi-font-weight:normal">Keywords:</b> Coronavirus, Dynamic Series, Spline Approximation, Minimax. <o:p></o:p></p> <p class="MsoNormal" style="mso-layout-grid-align:none;text-autospace:none"><o:p> </o:p></p> <p class="MsoNormal" style="mso-layout-grid-align:none;text-autospace:none"><b style="mso-bidi-font-weight:normal">AMS Subject Classification:</b> 41A15, 49J35, 65D07.<b><o:p></o:p></b></p></div><div id="clear2"></div><div class="pagi"><p> </p><p style="float:right;"><A HREF="javascript:history.go(-1)">Back</A> | <A HREF="#">Top</A></p></p></div><br /><br /> </td> <td width="348" valign="top"> <div class="newsblock" style="padding: 20px 0 10px 10px; width:305px;margin-top: 13px;"> <style> .button { border-top: 1px solid #96d1f8; background: #65a9d7; background: -webkit-gradient(linear, left top, left bottom, from(#3e779d), to(#65a9d7)); background: -webkit-linear-gradient(top, #3e779d, #65a9d7); background: -moz-linear-gradient(top, #3e779d, #65a9d7); background: -ms-linear-gradient(top, #3e779d, #65a9d7); background: -o-linear-gradient(top, #3e779d, #65a9d7); padding: 9.5px 19px; -webkit-border-radius: 8px; -moz-border-radius: 8px; border-radius: 8px; -webkit-box-shadow: rgba(0,0,0,1) 0 1px 0; -moz-box-shadow: rgba(0,0,0,1) 0 1px 0; box-shadow: rgba(0,0,0,1) 0 1px 0; text-shadow: rgba(0,0,0,.4) 0 1px 0; color: white; font-size: 14px; font-family: Georgia, serif; text-decoration: none; vertical-align: middle; } .button:hover { border-top-color: #28597a; background: #28597a; color: #fff; text-decoration: none; } .button:active { border-top-color: #1b435e; background: #1b435e; } </style> <script> /* $(document).ready(function() { $('.blink').blink({ delay: 2000 }); }); */ </script> <table cellspacing="0" cellpadding="0" border="0" style="width: 100%;"> <tbody> <tr> <td valign="top" style="padding-top: 8px;"><a href="http://coia-conf.org" class="blink button" target="_balnk">COIA- 2024</a></td> <td valign="top"><div class="section-name" style="margin-bottom: 5px;"><h1><span style="border-bottom: 0px solid #555555"><b>27-29 August 2024<br>Istanbul, Turkey </b> </span></h1></div></td> </tr> </table> </div> <div class="newsblock" style="padding: 15px 0 12px 10px;width:305px;margin-top: 13px;font-size: 16px;font-weight: bold;"> <a href="images/CALL_FOR_SI_TB_NV2.pdf" class="" target="_balnk">Call for Papers: Special Issue: Control, Teams, and Games</a> </div> <div class="newsblock" style="padding: 15px 0 12px 10px;width:305px;margin-top: 13px;font-size: 16px;font-weight: bold;"> <a href="images/CALL-FOR_PAPERS_SI.pdf" class="" target="_balnk">Call for Papers: Special issue on Artificial intelligence; where do we stand?</a>  </div> <div class="newsblock" style="padding: 15px 0 12px 10px;width:305px;margin-top: 13px;font-size: 16px;font-weight: bold;"> <a href="images/call_for_papers_on_coronavirus.pdf" class="" target="_balnk">Call for Papers: Special Issue on Coronavirus</a> </div> <style> .axtar-button {margin-top:2px !important; width:101% !important; height:40px !important; border:1px solid #c4c4c4 !important; cursor:pointer;} </style> <div class="newsblock" style="padding: 10px 0 10px 10px;width:305px;margin-top: 13px;font-size: 16px;font-weight: bold; margin-bottom:100px;"> <form name="search_form" method="POST" action="/view.php?lang=az&menu=articlesearch"> <table cellspacing="0" cellpadding="0" border="0" style="width: 100%;"> <tbody> <tr> <td colspan="2"><span style="border-bottom: 0px solid #555555"><b>Search</b> </span></td> </tr> <tr> <td style="padding: 10px 10px 0 0;"> <select name="search_combo" id="search_combo" style="width:96%; padding:5px; border-radius:8px;"> <option value="1" selected>Topic</option> <option value="2">Author</option> </select> </td> <td style="padding: 10px 10px 0 0;"><input name="inputarticlesearch" name="inputarticlesearch" type="text" value="" maxlength="100" style="width:96%; padding:5px; border-radius:8px;"></td> </tr> <tr> <td colspan="2" style="padding: 10px 10px 10px 0;"><input name="submit_axtar" type="submit" id="submit_axtar" value="Search" class="axtar-button blink button"></td> </tr> </tbody> </table> </form> </div> </td> </tr> </table> <div class="footer"> <table width="970" border="0" cellspacing="0" cellpadding="0" align="center"> <tr> <td valign="top" width="480">© Applied and Computational Mathematics An International Journal</td> <td valign="top">Address: Z. Khalilov 23, AZ1148, Baku, Azerbaijan<BR>Tel.: (+994) 12 539 15 95    (+994) 12 510 08 74    Email: <A href="mailto:office@acmij.az">office@acmij.az</A></td> </tr> </table> </div>  <script async src="https://www.googletagmanager.com/gtag/js?id=UA-136079144-1"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-136079144-1'); </script> </BODY> </HTML>