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Chapter 1: Introduction to Real-Time Systems
Albert M. K. Cheng
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Correctness of Real-Time Systems
Satisfaction of logical correctness constraints Satisfaction of timing constraints
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A Real-Time System A Sensor input Decision, action X Y D S State
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Distinguishing Embedded and Real-Time Systems
Real-time system: meets timing constraints Embedded system: part of another system Real-time systems Embedded systems
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Specification, analysis, and verification
Structural/Functional Behavioral - Sequence of events and actions Given: Specification (SP), Safety Assertion (SA) Goal: Relate SP to SA Analysis - 3 cases: SA is a theorem derivable from SP. SA is unsatisfiable with respect to SP. Negation of SA is satisfiable under certain conditions.
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Analysis Techniques Simulation Testing Verification
Run-time monitoring
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