Facility location, layout, design, and materials handling
Jafar Fathali; Morteza Nazari; Kobra Mahdvar
Abstract
In this paper, we discuss the obnoxious and semi-obnoxious version of the backup 2-median problem on a tree. In the obnoxious case of the 2-median problem, all vertices have negative weights, whereas in the semi-obnoxious model the vertices may have either positive or negative weights. In these two problems, ...
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In this paper, we discuss the obnoxious and semi-obnoxious version of the backup 2-median problem on a tree. In the obnoxious case of the 2-median problem, all vertices have negative weights, whereas in the semi-obnoxious model the vertices may have either positive or negative weights. In these two problems, we should find the location of two facility servers on the tree so that the sum of minimum weighted distances from vertices in the tree to the set of functioning servers is minimized. In the backup model, each facility server may probably fail. If a facility server fails, the remaining server should serve the clients. Vertex optimality is an important property for the 2-median problem. This property indicates that the set of vertices involves an optimal solution of the 2-median problem. We verify that the vertex optimality holds for the semi-obnoxious backup 2-median problem on a tree network. In the obnoxious 2-median problem, the set of leaves contains an optimal solution, we show that this property does not hold for the obnoxious backup 2-median problem.
Facility location, layout, design, and materials handling
Syufrianto Asmit; Hernadewita Hernadewita; Ahmad Ismail
Abstract
Genset or generator set is one of the sources of electricity used in oil palm plantations; genset are placed in a special building that is a Genset’s house. Some of the problems encountered in the Genset’s house are oil spills, fuel oil spills, and dirty floors; scattered items in Genset’s ...
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Genset or generator set is one of the sources of electricity used in oil palm plantations; genset are placed in a special building that is a Genset’s house. Some of the problems encountered in the Genset’s house are oil spills, fuel oil spills, and dirty floors; scattered items in Genset’s house, packaging of hazardous and untreated substances, no safety sign board, and no work instruction. The study has conducted in an oil palm plantation company located in Central Kalimantan Province. The used method in this study is 5S (Seiri, Seiso, Seiton, Sheiketsu, and Shitsuke) by observing, interviewing, and literature review related to the discussed aspects. The results of the study show that the implementation of 5S makes the Genset’s house cleaner, the more orderly place of the goods, the no oil spill, the wider genset room, and the fundamental advantage is to reduce the environmental pollution due to the hazardous and toxic substances. So that the applied 5S principle to other parts of the company has proved to be effective in the maintenance of Genset’s houses and has reduced the possibility of fires and accidents.
