Graduate Thesis Or Dissertation
 

HELM, hierarchical environment for linear modeling

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1z40kw71n

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  • Several problems relating to linear programming modeling have been identified: (1) model formulation, validation and explanation are difficult and time consuming; (2) models must be frequently updated and debugged; (3) flexibility is needed to specify the model schema for a class of problems as a group; and (4) significant differences exist between the way human model designers view a linear programming problem and the way a problem must be specified for solution by a computer. The following methods are used to resolve these problems in HELM: (1) allowing a broad class of similar problems to be specified as a group by using a data-independent modeling language for the model schema; (2) reduction of cognitive complexity of the modeling process by separating model schema from data storage and data acquisition; (3) increasing the range of models that can be specified by delaying binding the specific variables, constraints, and coefficients to be used for a particular instance of the models until run time; and (4) providing a translation facility to convert the model from a form convenient for a model designer to a standard format for use by an optimization module. This thesis describes the modeling language of the HELM (Hierarchical Environment for Linear Modeling) system for conceptualizing, organizing, and specifying the model schema of large-scale linear programming problems. It shows how to transform the standard linear programming form into the HELM model structure. A formal detailed description of HELM syntax is provided and the HELM process of model integration is described. The use of the system is demonstrated with an example.
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