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    <subfield code="a">Mendon&#xE7;a, Nathalia de Paiva </subfield>
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    <subfield code="a">Lopes, Is&#xE1;ira Leite e </subfield>
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    <subfield code="a">Gomes, Vanessa de Souza </subfield>
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    <subfield code="a">Ferreira, Matheus Andrade </subfield>
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    <subfield code="a">Cruz, Bruno Rog&#xE9;rio </subfield>
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    <subfield code="a">Silva, Carolina Souza Jarochinski e </subfield>
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    <subfield code="a">Gomide, Lucas Rezende </subfield>
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  <datafield tag="245" ind1=" " ind2=" ">
    <subfield code="a">SILVICULTURAL TASKS SCHEDULING OPTIMIZATION: A CASE STUDY OF FUNCTIONS AND METHODS</subfield>
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    <subfield code="a">Publica&#xE7;&#xE3;o on-line; 27 ref.; 3 illus; 2 tables; Sumaries (En, Pt)</subfield>
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ABSTRACT &#x2013; Scheduling problems are tasks of the operational routine in companies, which demand an optimal solution to support the decision. However, these problems have not been frequently investigated in forestry science. Therefore, it was proposed to describe a mathematical formulation for silviculture optimization under scheduling restriction of the workforce /sequencing of tasks (SSRCMM). Seeking the most suitable method to solve this combinatorial problem, two strategies were compared: i) Integer Linear Programming (ILP) and ii) simulated annealing (SA). The main criteria to assess strategies&#x2019; performance were to provide feasible solutions at an acceptable processing time and fi nal project cost. The instance approached is a real problem outlined in 32 stands and fi ve silvicultural tasks scheduled within a 40-day deadline. Three objective functions were also tested, defi ning case studies (S) to attend to the recurring managers&#x2019; decisions by minimizing: S&#xE56;&#x2013; project cost, S&#xE57; &#x2013; makespan, and S&#xE58; &#x2013; workforce usage. The results reveal a robust model to support the forest planner in operational-level tasks. The ILP achieved the optimal solution only for the minimization of the project cost (S&#xE56;) due to the delay in processing time of the other case studies. Thus, the SA stands out as an effi cient method to solve the SSRCMM by providing satisfactory solutions in a reduced time. All the objective functions fi tted properly with their proposed goals. The makespan and workforce usage functions increased by US$1,820.29 (S&#xE57;) and US$2,146.39 (S&#xE58;) from the S&#xE56;, respectively, to fi nish the project earlier and reduce the oscillation of workforce usage over the days. Facing these fi ndings, it is suggested that future researchers incorporate other challenges in decision-making, involving a multi-objective formulation or methods to reveal new insights for forest management and planning.

Keywords: Integer linear programming; Simulated annealing; Operational research.</subfield>
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RESUMO &#x2013; Problemas de agendamento s&#xE3;o tarefas da rotina operacional presentes nas empresas, que exigem uma solu&#xE7;&#xE3;o &#xF3;tima para apoiar a decis&#xE3;o. No entanto, esses problemas ainda n&#xE3;o foram investigados com frequ&#xEA;ncia na ci&#xEA;ncia florestal. Neste sentido, prop&#xF4;s-se descrever uma formula&#xE7;&#xE3;o matem&#xE1;tica para a otimiza&#xE7;&#xE3;o da silvicultura sob restri&#xE7;&#xE3;o de agendamento da m&#xE3;o de obra/sequenciamento das atividades (SSRRMM). Buscando o m&#xE9;todo mais adequado para solucionar este problema combinat&#xF3;rio, comparou-se duas estrat&#xE9;gias: i) Programa&#xE7;&#xE3;o Linear Inteira (PLI) e ii) Simulated annealing (SA). Os principais crit&#xE9;rios para avaliar o desempenho das estrat&#xE9;gias foram fornecer solu&#xE7;&#xF5;es f&#xE1;ctiveis em tempo de processamento e custo final do projeto aceit&#xE1;veis. A inst&#xE2;ncia abordada &#xE9; um problema real contendo 32 talh&#xF5;es e cinco atividades silviculturais programadas dentro de um prazo de 40 dias. Testou-se ainda tr&#xEA;s fun&#xE7;&#xF5;es objetivo, defi nindo estudos de caso (S) para atender &#xE0;s decis&#xF5;es recorrentes dos gestores, minimizando: S&#xADE; - custo do projeto, S&#xADF; - makespan e S&#xAE0; - utiliza&#xE7;&#xE3;o da m&#xE3;o de obra. Os resultados revelam um modelo robusto para apoiar o planejador 
florestal em tarefas a n&#xED;vel operacional. O PLI alcan&#xE7;ou a solu&#xE7;&#xE3;o &#xF3;tima apenas para a minimiza&#xE7;&#xE3;o do custo do projeto (S&#xADE;) devido &#xE0; demora no tempo de processamento dos outros estudos de caso. Desta forma, destaca-se o SA como um m&#xE9;todo eficiente para solucionar o SSRRMM, fornecendo solu&#xE7;&#xF5;es satisfat&#xF3;rias em um tempo reduzido. Todas as fun&#xE7;&#xF5;es objetivo se ajustaram adequadamente aos seus objetivos propostos. As fun&#xE7;&#xF5;es de makespan e de uso da m&#xE3;o de obra aumentaram US$ 1.820,29 (S&#xADF;) e US$ 2.146,39 (S&#xAE0;) em rela&#xE7;&#xE3;o ao S&#xADE;, respectivamente, para terminar o projeto mais cedo e reduzir a oscila&#xE7;&#xE3;o do uso da m&#xE3;o de obra ao longo dos dias. Diante dessas descobertas, sugere-se aos futuros pesquisadores incorporar outros desafios na tomada de decis&#xE3;o, envolvendo uma formula&#xE7;&#xE3;o multi-objetivo ou m&#xE9;todos para revelar novos insights dentro do manejo e planejamento fl0orestal. 

Palavras-Chave: Programa&#xE7;&#xE3;o linear inteira; Simulated annealing; Pesquisa Operacional </subfield>
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  <datafield tag="650" ind1=" " ind2=" ">
    <subfield code="a">SILVILCULTURA</subfield>
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  <datafield tag="650" ind1=" " ind2=" ">
    <subfield code="a">PLANEJAMENTO FLORESTAL</subfield>
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  <datafield tag="650" ind1=" " ind2=" ">
    <subfield code="a">MODELO MATEM&#xC1;TICO</subfield>
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    <subfield code="0">812</subfield>
    <subfield code="9">346929</subfield>
    <subfield code="d">Vi&#xE7;osa-MG Sociedade de Investiga&#xE7;&#xF5;es Florestais - Universidade Federal de Vi&#xE7;osa. Depto. de Engenharia Florestal 1977</subfield>
    <subfield code="o">2024-7727</subfield>
    <subfield code="t">Revista &#xC1;rvore (Brazil)</subfield>
    <subfield code="x">0100-6762</subfield>
    <subfield code="g">v. 46 p. 1-11 ; (2022)</subfield>
    <subfield code="w">BR2024004856</subfield>
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    <subfield code="u">https://www.scielo.br/j/rarv/a/YTxHRLJV5k3tS8tFXN8d3Yk/?format=pdf&amp;lang=en</subfield>
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    <subfield code="c">ANA</subfield>
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    <subfield code="c">330367</subfield>
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