Deadlock-able non-resolvable net system, Mechanical Engineering

See the Petri net represent in following figures (a) and (b) as represented in the figure for analysis and depiction of qualitative pathological behaviors.

962_Deadlock-able Non-Resolvable Net System.png

Figure: (a): An Unbounded Deadlock-able Non-Resolvable Net System

690_Deadlock-able Non-Resolvable Net System1.png

Figure: (b): Increasing the Number of Initial Markings 'Kills', the Live Net System

We can clearly consider that firing of transition t2 providing us a new marking M(0, 0, 1, 1) that means that p3 and p4 acquire one tokens each. Here by firing t2 we acquire a new marking M1 (1, 0, 1, 0). While we iterate this step n times the marking Mn(1, 0, n, 1) is attained. Hence we can consider that marking of p is dependent on the number of times we flow the tokens whereas firing the transitions t2 and t4. If we arbitrarily raise number of iterations to a very huge value then a condition termed as overflow can appear in these cases and the place p3 is said to be unbounded.

These situations should be carefully dealt along with as unbounded-ness is a pathological or unwanted situation. In other words we must say that the property of bounded-ness is a more advantageous situation.

In the similar manner Petri net if we fire transition t1 then it is clearly observable that no other transition able to be fired and the system come into a state of deadlock. It is a extremely not wanted situation. This is desirable for each model to be in a deadlock-free state and hence at least one transition must always convince the conditions for firing.

Once again we have a state of liveliness that is stronger than deadlock-freeness. A transition is live whether it is potentially friable in all reachable markings. Hence a live transition all the time has the possibility of firing and a net system is termed as live if all the transitions are friable.

The reversibility's property holds a significant position in the Petri net modelling analysis. A reversible net system is only that can reach to its initial marking from any of its intermediate markings. In the following figure (a), the above situation is not satisfied and so lead to a nonreversible net structure. If a total deadlock is attained at any reachable marking, the net system can't be reversible except the reverse is not all times true. Therefore a system might not be reversible however; it can hold the liveliness and thus deadlock-freeness.

Posted Date: 2/23/2013 6:04:23 AM | Location : United States







Related Discussions:- Deadlock-able non-resolvable net system, Assignment Help, Ask Question on Deadlock-able non-resolvable net system, Get Answer, Expert's Help, Deadlock-able non-resolvable net system Discussions

Write discussion on Deadlock-able non-resolvable net system
Your posts are moderated
Related Questions
First law of thermodynamics applied to flow process

Determine the maximum stress - thick cylinder: A thick cylinder of steel with an internal diameter of 100 mm & external diameter of 200 mm is subjected to an internal pressure

The Linear Dimension Command                                    You can use this command to generate horizontal and vertical dimensions.Creating a linear dimension is eas

"Extension of screw conveyer by using spline shaft, U-joint with the help of hydraulic cylinder" For fully automatic extension of screw conveyer according to screed width we ha

Stress Strai n Curves (Tension): When a bar or specimen is subjected to a gradually increasing axial tensile load, the strains and stresses can be found out for number of loa

what are the properties magnet ? also how the repulsion is measured?

Evaluate the power output of turbine: Q: A turbine in steam power plant operating under steady state conditions receives the superheated steam at 3MPa and 350ºC at the rate o

Solid Modeling: 3-D solid modelling techniques provide the user along with complete information regarding the model. These may be quickly created without having to describe in

IMPULS E TURBINE: The steam turbine in which the steam expands while passing through nozzle and remains at the constant pressure over the blades is called as impulse turbine.

Q. External coatings on vessels? All pressure vessels that will be installed underground shall have an external coating applied according to the following procedure: • All e