5, working shedding technology and flow analysis
Decide the capacity such as processing to enhance the inaccuracy of Cheng of Petri net convection, the coloured Petri network that extension used here () of net of Petri of the following abbreviation. A lot of jobs shed a model to use Petri net to regard the description of flow as the tool. Petri net shows the activity to be changes, entity or the job such as equipment, tool, personnel shed condition to express to be library place, thereby flow map is Petri net.
Should say, petri net has more powerful flow analysis and evaluation capacity. But often compare with Petri net to large flow complex, need is used simplify measure (undertake deleting to certain library place, changes and arc or shirt-sleeve, but the) of certain structure quality that does not change Petri network. In addition the job that describes a language as flow with Petri net sheds a model, the regulation of usable Petri net regards the tie in flow as the condition, but the structure that cannot convey flow explicitly, understand the executive process of flow hard. For this pair of more complex systems here introduces object-oriented idea. Thinking of object-oriented mankind of thought press close to, it has rich semantics. The union that object-oriented technology and job shed considers to have two kinds of methods. It is the methodological implementation that the job sheds a model to use object-oriented process designing firstly, all sorts of ideas that include technological process and its correlation try to describe with the form of the object. Another kind of method is to use object-oriented technology to build a model for flow, can describe technological process effectively with many objects gather. Like document [5] puts forward to use object-oriented technology, the current work that by the object structure of configuration, object and object behavior model make flows model and be based on this flow of current model to analyse a method, can increase earnings flow model but sex of put sb in a very important position and flexibility.
Petri network model reachs his to expand the form has stronger close sex, intelligibility and abstract ability and computerization capacity, it can use the qualitative property that analyses a model not only, return the mensurable property that can analyse a model, already was in of flow build model and optimize a respect to receive wide application. The job sheds the element of model element and Petri net to have clear corresponding concern, flow is emulated shed the job above all wire mould of Petri of model translate into, its key is a flow regulation map to model of patulous Petri network. Flow regulation collect is the technological process of going from place to place that uses the act that defines conduct of descriptive domain flow, it is comprised by a group of orderly flow regulation, branch of the first concern that uses expressive activity, collateral relation, condition, incorporate and concern circularly. Flow model shows with Petri net, the flow such as the security that can analyse consistency of flow activity connective, technological process with mature algorithm is characteristic, need not flow to must change ability to move via example in that way like the job. Concerned job sheds a model to change a method to what extend Petri network, can consult concerned document [6, 7] , here discusses no longer.
Previous12 Next