We point out deeciencies of previous treatments of liveness. We deene a new liveness condition in two forms: one based on nite trace theory, and the other on automata. We prove the equivalence of these two deenitions. We also introduce a safety condition and provide modular and hierarchical veriication theorems for both safety and liveness. Finally, we present a veriication algorithm for liveness.

There are many tourism cities in China and sustainable development of urban tourism has become an important field of tourism research. An ecological safety evaluation index system of tourism city was constructed. The evaluation index system was composed of resource, environmental, economic and social subsystem. Classification standard of evaluation indexes was discussed. Then an evaluation mode...

FUNCTION Mass/energy flow and balance GENERAL FUNCTION Flow and storage of heat, etc. PHYSICAL FUNCTION States of components what? what? what? what? what?

Ferry accidents often occur the result of ship handling difficulty which interfacing human, machine and environment. Therefore, a decision tool model as a comprehensive information system, based on the ship handling difficulty, needs to be developed through the combination of Analytic Hierarchy Process (AHP) and Fuzzy Logic System. The Fuzzy Logic System part consists of ship condition, ship ha...