Vol. 7 No. 4 (2021) | U.Porto Journal of Engineering

<!DOCTYPE html> <html lang="en" xml:lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title> Vol. 7 No. 4 (2021) | U.Porto Journal of Engineering </title> <link rel="icon" href="https://journalengineering.fe.up.pt/public/journals/3/favicon_en_US.png"> <meta name="generator" content="Open Journal Systems 3.4.0.3"> <link rel="alternate" type="application/atom+xml" href="https://journalengineering.fe.up.pt/index.php/upjeng/gateway/plugin/APP%5Cplugins%5Cgeneric%5CwebFeed%5CWebFeedGatewayPlugin/atom"> <link rel="alternate" type="application/rdf+xml" href="https://journalengineering.fe.up.pt/index.php/upjeng/gateway/plugin/APP%5Cplugins%5Cgeneric%5CwebFeed%5CWebFeedGatewayPlugin/rss"> <link rel="alternate" type="application/rss+xml" href="https://journalengineering.fe.up.pt/index.php/upjeng/gateway/plugin/APP%5Cplugins%5Cgeneric%5CwebFeed%5CWebFeedGatewayPlugin/rss2"> <link rel="stylesheet" href="https://journalengineering.fe.up.pt/index.php/upjeng/$$$call$$$/page/page/css?name=bootstrap" type="text/css" /> </head> <body class="pkp_page_issue pkp_op_view has_site_logo"> <div class="pkp_structure_page"> <nav id="accessibility-nav" class="sr-only" role="navigation" aria-label="Quick jump to page content"> <ul> <li><a href="#main-navigation">Main Navigation</a></li> <li><a href="#main-content">Main Content</a></li> <li><a href="#sidebar">Sidebar</a></li> </ul> </nav> <header class="navbar navbar-default" id="headerNavigationContainer" role="banner"> <div class="container-fluid"> <div class="row"> <nav aria-label="User Navigation"> <ul id="navigationUser" class="nav nav-pills tab-list pull-right"> <li class=" menu-item-1"> <a href="https://journalengineering.fe.up.pt/index.php/upjeng/user/register"> Register </a> </li> <li class=" menu-item-2"> <a href="https://journalengineering.fe.up.pt/index.php/upjeng/login"> Login </a> </li> </ul> </nav> </div> </div> <div class="container-fluid"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#nav-menu" aria-expanded="false" aria-controls="nav-menu"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <div class="site-name"> <a href=" https://journalengineering.fe.up.pt/index.php/upjeng/index " class="navbar-brand navbar-brand-logo"> <img src="https://journalengineering.fe.up.pt/public/journals/3/pageHeaderLogoImage_en_US.png" alt="U. 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here:"> <ol class="breadcrumb"> <li> <a href="https://journalengineering.fe.up.pt/index.php/upjeng/index"> Home </a> </li> <li> <a href="https://journalengineering.fe.up.pt/index.php/upjeng/issue/archive"> Archives </a> </li> <li class="active"> Vol. 7 No. 4 (2021) </li> </ol> </nav> <div class="issue-toc"> <div class="heading row"> <div class="thumbnail col-md-4"> <a class="cover" href="https://journalengineering.fe.up.pt/index.php/upjeng/issue/view/2183-6493_007-004"> <img class="img-responsive" src="https://journalengineering.fe.up.pt/public/journals/3/cover_issue_58_en_US.png" alt=""> </a> </div> <div class="issue-details col-md-8"> <p class="published"> <strong> Published: </strong> 2021-11-26 </p> </div> </div> <div class="sections"> <section class="section"> <div class="media-list"> <div class="article-summary media"> <div class="cover media-left"> <a href="https://journalengineering.fe.up.pt/index.php/upjeng/article/view/2183-6493_007-004_0001" class="file"> <img 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Vol. 7 No. 4 (2021) | U.Porto Journal of Engineering