| Summary: | The Constraint Nets model (CN) proves to be useful for a wide variety of purposes,
ranging from intelligent agent systems, and real-time embedded systems, to integrated
hybrid systems with various time structures: discrete, continuous, and time-based. This
thesis describes a new visual programming environment called CNJ (Constraint Nets in
Java) which utilizes component-based technology.
CNJ uses JavaBeans, Bean Introspection, drag-and-drop, and Java Swing MDI
(Multiple Document Interface) technologies, as well as XML-based CNML as its
standard interchange format. The environment supports constraint net modeling,
simulation, and animation for hybrid systems. Furthermore, it provides support for a topdown
design, middle-out design, and bottom-up design where the module bean can be
reused anywhere in any other CN model, saving designers time and effort. As an
experiment, a hybrid dynamic elevator system is developed successfully, and test results
confirm the effectiveness of the tool for hybrid system modeling and real-time
simulation.
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