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C.</a></div> <h2 class="title"> <strong>Mathematical optimization approach for facility layout on several rows.</strong> <i>(English)</i> <a class="label nowrap" href="/1460.90114">Zbl 1460.90114</a> </h2> <div class="source"> <a href="/serials/4920" title="Journal Profile">Optim. Lett.</a> <a href="/?q=in%3A459328" title="Articles in this Issue">15, No. 1, 9-23 (2021)</a>. </div> <div class="abstract">Summary: The facility layout problem is concerned with finding an arrangement of non-overlapping indivisible departments within a facility so as to minimize the total expected flow cost. In this paper we consider the special case of multi-row layout in which all the departments are to be placed in three or more rows, and our focus is on, for the first time, solutions for large instances. We first propose a new mixed integer linear programming formulation that uses continuous variables to represent the departments’ location in both \(x\) and \(y\) coordinates, where \(x\) represents the position of a department within a row and \(y\) represents the row assigned to the department. We prove that this formulation always achieves an optimal solution with integer values of \(y\), but it is limited to solving instances with up to 13 departments. This limitation motivates the application of a two-stage optimization algorithm that combines two mathematical optimization models by taking the output of the first-stage model as the input of the second-stage model. This algorithm is, to the best of our knowledge, the first one in the literature reporting solutions for instances with up to 100 departments.</div> <div class="clear"></div> <br> <div class="citations"><div class="clear"><a href="/?q=rf%3A7315886">Cited in <strong>1</strong> Document</a></div></div> <div class="classification"> <h3>MSC:</h3> <table><tr> <td> <a class="mono" href="/classification/?q=cc%3A90C11" title="MSC2020">90C11</a> </td> <td class="space"> Mixed integer programming </td> </tr><tr> <td> <a class="mono" href="/classification/?q=cc%3A90C90" title="MSC2020">90C90</a> </td> <td class="space"> Applications of mathematical programming </td> </tr></table> </div><div class="keywords"> <h3>Keywords:</h3><a href="/?q=ut%3Afacilities+planning+and+design">facilities planning and design</a>; <a href="/?q=ut%3Aunequal-areas+facility+layout">unequal-areas facility layout</a>; <a href="/?q=ut%3Arow+layout">row layout</a>; <a href="/?q=ut%3Amixed+integer+linear+programming">mixed integer linear programming</a>; <a href="/?q=ut%3Acontinuous+optimization">continuous optimization</a></div> <div class="software"> <h3>Software:</h3><a href="/software/31820">RowLayout</a></div> <!-- Modal used to show zbmath metadata in different output formats--> <div class="modal fade" id="metadataModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"> <div class="modal-dialog" role="document"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button> <h4 class="modal-title" id="myModalLabel">Cite</h4> </div> <div class="modal-body"> <div class="form-group"> <label for="select-output" class="control-label">Format</label> <select id="select-output" class="form-control" aria-label="Select Metadata format"></select> </div> <div class="form-group"> <label for="metadataText" class="control-label">Result</label> <textarea class="form-control" id="metadataText" rows="10" style="min-width: 100%;max-width: 100%"></textarea> </div> <div id="metadata-alert" class="alert alert-danger" role="alert" style="display: none;"> <!-- alert for connection errors etc --> </div> </div> <div class="modal-footer"> <button type="button" class="btn btn-primary" onclick="copyMetadata()">Copy to clipboard</button> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> </div> </div> </div> </div> <div class="functions clearfix"> <div class="function"> <!-- Button trigger metadata modal --> <a type="button" class="btn btn-default btn-xs pdf" data-toggle="modal" data-target="#metadataModal" data-itemtype="Zbl" data-itemname="Zbl 1460.90114" data-ciurl="/ci/07315886" data-biburl="/bibtex/07315886.bib" data-amsurl="/amsrefs/07315886.bib" data-xmlurl="/xml/07315886.xml" > Cite </a> <a class="btn btn-default btn-xs pdf" data-container="body" type="button" href="/pdf/07315886.pdf" title="Zbl 1460.90114 as PDF">Review PDF</a> </div> <div class="fulltexts"> <span class="fulltext">Full Text:</span> <a class="btn btn-default btn-xs" type="button" href="https://doi.org/10.1007/s11590-020-01621-z" aria-label="DOI for “Mathematical optimization approach for facility layout on several rows”" title="10.1007/s11590-020-01621-z">DOI</a> </div> <div class="sfx" style="float: right;"> <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" title="Open Access License" class="cc-license-link no-new-tab-icon"> <img src="https://static.zbmath.org/contrib/img/cc/svg/icons/cc.svg" alt="Creative Commons CC license icon" class="cc-license-icon"> <img src="https://static.zbmath.org/contrib/img/cc/svg/icons/by.svg" alt="Creative Commons BY license icon" class="cc-license-icon"> </a> </div> </div> <div class="references"> <h3>References:</h3> <table><tr> <td>[1]</td> <td class="space">Amaral, ARS, A new lower bound for the single row facility layout problem, Discrete Appl. 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