University of Minnesota
Software Engineering Center
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Jimin Gao

Recent Publications

Flexible and Extensible Notations for Modeling Languages

In model-based development, a formal description of the software (the model) is the central artifact that drives other development activities. The availability of a modeling language well-suited for the system under development and appropriate tool support are of utmost importance to practitioners. Considering the diverse needs of different application domains, flexibility in the choice of modeling languages and tools may advance the industrial acceptance of formal methods.

On the Advantages of Approximate vs. Complete Verification: Bigger Models, Faster, Less Memory, Usually Accurate.

As software grows increasingly complex, verification becomes more and more challenging. Automatic verification by model checking has been effective in many domains including computer hardware design, networking, security and telecommunications protocols, automated control systems and others. Many realworld software models, however, are too large for the available tools. The difficulty--how to verify large systems--is fundamentally a search issue: the global state space representing all possible behaviors of a complex software system is exponential in size.

Auto-Generating Test Sequences using Model Checkers: A Case Study

Use of model-checking approaches for test generation from requirement models have been proposed by several researchers. These approaches leverage the witness (or counter-example) generation capability of model-checkers for constructing test cases. Test criteria are expressed as temporal properties. Witness traces generated for these properties are instantiated to create complete test sequences, satisfying the criteria. State-space explosion can, however, adversely impact model-checking and hence such test generation. Thus, there is a need to

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