Classify the following real time systems into one of three possibilities: hard,
ID: 3897579 • Letter: C
Question
Classify the following real time systems into one of three possibilities: hard, soft or firm (You must justify your choice)
a. Airport security system
b. An on line VIP airline reservation system
c. College of engineering database that provides information on student cheaters for the academic code of conduct committee
d. The computer system controlling the Panama Canal locking/unlocking the Canal for ships
e. An ABS (brake) system for a school bus
f. The U.S. Postal Service’s mail processing system, which classify mail to the appropriate bin depending on ZIP Code
g. military Tank simulator for the training arm forces
h. A controller for an unmanned combat airplane
i. Home security system
j. Tsunami warning system
Explanation / Answer
Answer)
Soft Real Time : This is probably the easiest for understanding and if at any point of time the results fetched are after the deadline time then results can still be considered as valid.
Hard Real Time: Incase if the results are being obtained after the given cut off time then the system is considered to have been failed or destroyed.
Firm Real System: Incase if the process of the execution is being done after the deadline given the the results are not considered but system can still continue and is not considered as failed.
Below are the following real time systems which are classified accordingly as soft, real or firm.
A. Hard
B. Firm
C. Firm
D. Hard
E. Hard
F. Firm
G. Hard
H. Hard
I. Firm
J. Hard