# 3.1 Review question: synchronization  (Page 4/4)

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A           15                4

B            9                7

C            3                3

D            6                1

E           12                6

a. round robin with a time quantum of 1 minute

1 2 3 4 5   Elapsed Time

============================

A B C D E   5

A B C D E   10

A B C D E   15

A B     D E   19

A B     D E   23

A B     D E   27

A B        E   30

A B        E   33

A B        E   36

A           E   38

A           E   40

A           E   42

A               43

A               44

A               45

Process Turnaround Time

========================

A        45

B        35

C        13

D        26

E        42

Average Turnaround Time = 32.2 minutes

b. priority scheduling

Process Priority Turnaround Time

==================================

B        7         9

E        6        21

A        4        36

C        3        39

D        1        45

Average Turnaround Time = 30 minutes

c. FCFS (run in order 15, 9, 3, 6, and 12)

Process Turnaround Time

========================

A        15

B        24

C        27

D        33

E        45

Average Turnaround Time = 28.8 minutes

d. shortest job first

Process Running Time Turnaround Time

======================================

C            3          3

D            6          9

B            9          18

E           12          30

A           15          45

Average Turnaround Time = 21 minutes

## Consider a set of three periodic tasks with the execution profiles as follows:

 Process Arrival Time Execution Time Ending Deadline A(1) 0 10 20 A(2) 20 10 40 . . . . . . . . . . . . B(1) 0 10 50 B(2) 50 10 100 . . . . . . . . . . . . C(1) 0 15 50 C(2) 50 15 100 . . . . . . . . . . . .

Develop scheduling diagrams for this set of tasks.

## Suppose that a microcontroller used in an automobile has four priority levels for interrupts. the units interrupting the controller include anImpact sensor subsystem, which needs attention with 0.1 ms, along with four other subsystems as follows:

 Subsystem Interrupt Rate Max service time (ms) Fuel/ignition 500/sec 1 Engine temperature 1/sec 100 Dashboard display 800/sec 0.2 Air conditioner 1/sec 100

Discuss how priorities could be assigned to guarantee the response time of 0.1 ms for the impact sensor and to handle each of theother critical units before the next interrupt is produced.

The impact sensor must be given the highest priority because its required response time is less than the service time for each of theother interrupts types; no other subsystem can share this highest priority.

The air conditioner can be given the lowest priority level because its function is not safety-critical.

We have two priority levels left for three subsystems.

Because the engine temperature monitor has a maximum service time of 100 ms it must have a lower priority than the display andfuel/ignition subsystems, which need several hundreds of service periods per second.

Finally, the display and fuel/ignition subsystems can share the same priority level since each can be served after the other withoutexceeding the time available before the next interrupt.

For example, if the fuel/ignition subsystem service starts right before the display interrupt, a total of 1.2 ms will elapse beforethe service routines of both interrupts are completed, whereas there is 1/800 sec - 1.25 ms available before the next dashboard display interruptarrives.

Note that we have ignored the service time for impact sensor subsystem interrupts that have the highest priority because they occurvery infrequently, and when they do, all else becomes unimportant.

where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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