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OPTIMIZATION MODEL FOR VEHICLE ROUTING AND EQUIPMENT REPLACEMENT IN FARM MACHINERY REA
Grano,Carolina; Abensur,Eder.
ABSTRACT: An equipment replacement decision takes into account economic engineering models based on discounted cash flow (DCF) such as the Annual Equivalent Cost (AEC). Despite a large number of researches on industrial assets replacement, there is a lack of studies applied to farm goods. This study aimed at assessing an alternative model for economic decision analysis on farm machinery replacement, with no restrictions on the number of replacements and assessed goods during a defined timeline. The results of the hybrid model based on the combination of the vehicle routing problem and the equipment replacement problem (RVPSE) applied to three different farm tractors showed the model reliability, providing a wider range of decisions for management support.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Economic engineering; Annual equivalent cost; Integer linear programming.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500987
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Optimal selective logging regime and log landing location models: a case study in the Amazon forest Acta Amazonica
SILVA,Paulo Henrique da; GOMIDE,Lucas Rezende; FIGUEIREDO,Evandro Orfanó; CARVALHO,Luis Marcelo Tavares de; FERRAZ-FILHO,Antônio Carlos.
ABSTRACT Reduced-impact logging is a well known practice applied in most sustainable forest management plans in the Amazon. Nevertheless, there are still ways to improve the operational planning process. Therefore, the aim of this study was to create an integer linear programming (ILP) to fill in the knowledge gaps in the decision support system of reduced impact logging explorations. The minimization of harvest tree distance to wood log landing was assessed. Forest structure aspects, income and wood production were set in the model, as well as the adjacency constraints. Data are from a dense ombrophylous forest in the western Brazilian Amazon. We applied the phytosociological analysis and BDq method to define the selective logging criteria. Then, ILP...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forest planning; Reduced-impact logging; Integer linear programming; Sustainable forest management; Liocourt quocient.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000100018
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