Mathematical Modeling and Control of COVID-19 Using Super Twisting Sliding Mode and Nonlinear Techniques

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Performance index (PI)</td><td class="align_center">Descriptions</td><td class="align_center">Mathematical representation</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left"><span style="width: 21.9302ptpx;"><svg height="8.98583pt" id="M208" style="vertical-align:-0.2324905pt" version="1.1" viewbox="-0.0498162 -8.75334 21.9302 8.98583" width="21.9302pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M303 0V28C221 34 213 39 213 125V525C213 610 221 616 303 622V650H38V622C120 616 128 610 128 525V125C128 40 120 34 38 28V0H303Z"></path></g><g transform="matrix(.013,0,0,-0.013,3.95,0)"><path d="M673 0V28C608 34 594 43 563 129C499 303 432 494 370 665L339 656L132 132C98 43 84 37 20 28V0H238V28C162 35 154 45 175 108C188 150 203 192 219 237H432C454 176 474 122 487 83S491 36 428 28V0H673ZM418 280H234C265 362 296 450 328 535H330L418 280Z"></path></g><g transform="matrix(.013,0,0,-0.013,12.176,0)"><path d="M716 650H478V622C549 617 570 605 575 566C579 535 582 493 582 401V326C582 161 537 40 393 40C269 40 205 133 205 294V521C205 611 213 617 291 622V650H33V622C111 615 120 611 120 521V272C120 154 148 80 208 34C252 0 309 -14 368 -14C434 -14 501 7 548 55C605 116 623 201 623 319V401C623 493 626 536 629 563C633 605 656 618 716 622V650Z"></path></g></svg></span></td><td class="align_center">Integral absolute of the control signal</td><td class="align_center"><span style="width: 52.2734ptpx;"><svg height="20.7512pt" id="M209" style="vertical-align:-5.726pt" version="1.1" viewbox="-0.0498162 -15.0252 52.2734 20.7512" width="52.2734pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,.007)"><path d="M480 853C480 879 456 900 424 900C303 900 237 760 239 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colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Description and mathematical representation of the performance index.</div>

Computational Intelligence and Neuroscience

tab4

Table 4

Table 4: Mathematical Modeling and Control of COVID-19 Using Super Twisting Sliding Mode and Nonlinear Techniques 