Consider the following State Transition Table from our text. This is the State TransitionTable we were given for Ben Bitdiddle's modified traffic light system. This modified versionhas a Parade Mode built into it. Remember that when the system goes into Parade Mode,the desired behavior is that Academic Ave will be shut down with a red light, and BravadoBlvd will be opened up and stay open as long as the parade is taking place. Once theparade had finished, a Facilities Manager will turn Parade Mode off (by asserting the R,Return to Normal Mode, signal), taking it out of Parade Mode and eventually (hopefully)returning the system to the initial state, S0.Here's the State Transition Diagram for the modified system with Parade mode.Note: P = Parade Mode, R = Return to Normal Mode.PTAPTARTAResetPT.RT.soLa greenL redS1RTAS5La yellowPL redS4L greenL redLa: yellowR redPTAPTS3Lại redL yellowS2L redL greenS7L redL yellowS6L redLe greenPTBRTeRT.As we discussed, there appears to be at least one flaw in this new design, and maybemore. One flaw is that if we are in State S0 (traffic is on Academic Ave), and the FacilitiesManager sets the system into Parade Mode, the system will transition to State S4. Butnone of the traffic lights are changed, so people walking on Academic Ave can just keepwalking. The problem appears to be that as long as there is traffic on Academic Ave, westay in State S4 (due to R'Ta). We will stay in that mode for an unbounded amount of timeas long as the traffic sensor Ta tells us there is continuing traffic on Academic Avenue. As aresult, the Parade could be held up and prevented from starting for a very long time. Thiswould not be good.Question: What if we removed the PTa edge from S0 to S4 above (the second edge fromthe top) and added an edge from S0 to S1 labeled simply P? Would that solve the problemand let the parade begin ASAP? Why or why not? If yes, explain why. If not, say so andexplain why not. And if this doesn't solve the problem, can you find an alternative way tosolve it?

Consider the following State Transition Table from our text. This is the State Transition Table we were given for Ben Bitdiddle's modified traffic light system. This modified version has a Parade Mode built into it. Remember that when the system goes into Parade Mode, the desired behavior is that Academic Ave will be shut down with a red light, and Bravado Blvd will be opened up and stay open as long as the parade is taking place. Once the parade had finished, a Facilities Manager will turn Parade Mode off (by asserting the R, Return to Normal Mode, signal), taking it out of Parade Mode and eventually (hopefully) returning the system to the initial state, S0. Here's the State Transition Diagram for the modified system with Parade mode. Note: P = Parade Mode, R = Return to Normal Mode. PT.

Consider the following State Transition Table from our text. This is the State Transition Table we were given for Ben Bitdiddle's modified traffic light system. This modified version has a Parade Mode built into it. Remember that when the system goes into Parade Mode, the desired behavior is that Academic Ave will be shut down with a red light, and Bravado Blvd will be opened up and stay open as long as the parade is taking place. Once the parade had finished, a Facilities Manager will turn Parade Mode off (by asserting the R, Return to Normal Mode, signal), taking it out of Parade Mode and eventually (hopefully) returning the system to the initial state, S0. Here's the State Transition Diagram for the modified system with Parade mode. Note: P = Parade Mode, R = Return to Normal Mode. PT.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Consider the following State Transition Table from our text. This is the State Transition
Table we were given for Ben Bitdiddle's modified traffic light system. This modified version
has a Parade Mode built into it. Remember that when the system goes into Parade Mode,
the desired behavior is that Academic Ave will be shut down with a red light, and Bravado
Blvd will be opened up and stay open as long as the parade is taking place. Once the
parade had finished, a Facilities Manager will turn Parade Mode off (by asserting the R,
Return to Normal Mode, signal), taking it out of Parade Mode and eventually (hopefully)
returning the system to the initial state, S0.
Here's the State Transition Diagram for the modified system with Parade mode.
Note: P = Parade Mode, R = Return to Normal Mode.
PTA
PTA
RTA
Reset
PT.
RT.
so
La green
L red
S1
RTA
S5
La yellow
P
L red
S4
L green
L red
La: yellow
R red
PTA
PT
S3
Lại red
L yellow
S2
L red
L green
S7
L red
L yellow
S6
L red
Le green
PTB
RTe
RT.
As we discussed, there appears to be at least one flaw in this new design, and maybe
more. One flaw is that if we are in State S0 (traffic is on Academic Ave), and the Facilities
Manager sets the system into Parade Mode, the system will transition to State S4. But
none of the traffic lights are changed, so people walking on Academic Ave can just keep
walking. The problem appears to be that as long as there is traffic on Academic Ave, we
stay in State S4 (due to R'Ta). We will stay in that mode for an unbounded amount of time
as long as the traffic sensor Ta tells us there is continuing traffic on Academic Avenue. As a
result, the Parade could be held up and prevented from starting for a very long time. This
would not be good.
Question: What if we removed the PTa edge from S0 to S4 above (the second edge from
the top) and added an edge from S0 to S1 labeled simply P? Would that solve the problem
and let the parade begin ASAP? Why or why not? If yes, explain why. If not, say so and
explain why not. And if this doesn't solve the problem, can you find an alternative way to
solve it?

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