A Framework for Model-Based Adaptive Training

Precision: The exactness of detail in the model description

Figure 4-3 Partial Concept Hierarchy shows an example of 5 different levels for Proto-MOBAT training subject detail.

In Workmanship-MOBAT, several different concept hierarchies, in distinct categories, have been created for components, definitions, topics, defects, causes, fixes, preventions, conclusions, dispositions, checks and repairs. Each of these categories contain hierarchies.

For example:(a1) Flux Þ (a2) Rosin Þ (a3) Rosin Connection Þ (a4) Residue ; or (b1)Solder Þ (b2)Soldering Þ (b3) Solder Impurities Þ (b4)Solder Masking Þ (b5) Solder Paste Þ (b6) Solder Projection.

“Rosin” is a type of “flux” therefore rosin (a2) is more precise then flux (a1).

“Soldering” is a process for using “solder” therefore solder (b1) is at a higher level of abstraction then soldering (b2).

Both these hierarchies are only valid in the Workmanship-MOBAT domain and a different sequence may be applicable for the same concepts in other domains.

The precision of a model can be described by the concept level within a description hierarchy of training properties in the subject domain. Within such a hierarchy, the decision to train at a high abstract level would be less precise then training at a detailed level. The lower topic levels provide fine levels of detail (granularity) for the training problem at hand.

The process of modifying the level of precision of a model is termed abstraction. The more abstract aspects of a model are generally more easily understood. A typical training strategy is utilising models of the domain at a high level to promote understanding and then to progress to more precise aspects of models as the training evolves.

Typically, the higher abstract models are presented before more detail or complexity is introduced. The most precise models are often numerical descriptions. Numerical descriptions are generally used with quantitative models instead of the usual symbolic representations in qualitative models.

In Workmanship-MOBAT, quantitative simulation models are utilised for each of the circuit board assembly process steps (e.g., screen print process, component placement).


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