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    Item type:Publication,
    Decision Support Model and Software for Consolidated Order Assignment to Delivery Trucks
    (2017-11-15)
    Leenawong, Chartchai
    ;
    Wattanawalun, Champ
    ;
    Wongsa, Kittipish
    ;
    Lethaisong, Karnkanok
    In this research, a decision model for assisting in loading consolidated orders onto delivery trucks to distribute to scattered customers is constructed. Each truck can have more than one drop-off location. The case-study company based in Bangkok produces bubble wraps that can simply be stacked up on top of the companys small trucks. Most customer orders are less than truck-load. Thus, consolidating orders into full trucks according to customer locations is necessary to ensure minimum transportation and in-transit inventory carrying costs. 0-1 integer programming is used in the model construction. Also, a decision support system for dealing with this problem is developed for ease of use to logistics managers and planners.
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    A mathematical model for pollution in a river and its remediation by aeration
    (2009-03-01)
    Pimpunchat, Busayamas
    ;
    Sweatman, Winston L.
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    Wake, Graeme C.
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    Triampo, Wannapong
    ;
    Parshotam, Aroon
    We present a simple mathematical model for river pollution and investigate the effect of aeration on the degradation of pollutant. The model consists of a pair of coupled reaction-diffusion-advection equations for the pollutant and dissolved oxygen concentrations, respectively. The coupling of these equations occurs because of reactions between oxygen and pollutant to produce harmless compounds. Here we consider the steady-state case in one spatial dimension. For simplified cases the model is solved analytically. We also present a numerical approach to the solution in the general case. The extension to the transient spatial model is relatively straightforward. The study is motivated by the crucial problem of water pollution in many countries and specifically within the Tha Chin River in Thailand. For such real situations, simple models can provide decision support for planning restrictions to be imposed on farming and urban practices. © 2008 Elsevier Ltd. All rights reserved.