CSCE 3612 ch9-2

CSCE 3612 ch9-2 - System design techniques Quality...

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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. System design techniques Quality assurance.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Quality assurance Quality  judged by how well product  satisfies its intended function. May be measured in different ways for  different kinds of products. Quality assurance  ( QA ) makes sure that  all stages of the design process help to  deliver a quality product.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Therac-25 Medical Imager (Leveson and Turner) Six known accidents: radiation overdoses  leading to death and serious injury. Radiation gun controlled by PDP-11. Four major software components: stored data; scheduler; set of tasks; interrupt services.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Therac-25 tasks Treatment monitor controlled and  monitored setup and delivery of treatment  in eight phases. Servo task controlled radiation gun. Housekeeper task took care of status  interlocks and limit checks.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Treatment monitor task Treat was main monitor task. Eight subroutines. Treat rescheduled itself after every  subroutine.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed.
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This note was uploaded on 09/30/2008 for the course CSCE 3612 taught by Professor Goodrum during the Fall '08 term at North Texas.

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CSCE 3612 ch9-2 - System design techniques Quality...

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