New rule with local one step ahead prediction: wls rule, Mechanical Engineering

New Rule with Local One Step Ahead Prediction: WLS Rule

Along with an observation to improve the performance measure of the system, a dynamic posteriori rule, the WLS that is weighted loss of slack rule used.

The weighted loss of slack rule evaluates the condition of all other operations in the respective queue whether operation j would be scheduled. This decision will reason a loss of slack for all the other operations waiting in the queue.  It is most crucial, whether an operation would have negative slack tsi after scheduling of operation j. Hence, the unsafe loss of slack of operation i because of the scheduling of operation j before i is:

         1087_New Rule with Local One Step Ahead Prediction-WLS Rule.png

In Eq. (6), the differences of the exponentially weighted slack after and before the scheduling of operation j are totaling up.  The  exponential  weighting  offers  an incentive to prefer long operations (that reason larger losses of slack than short ones) while their slack reduces and therefore assists to maintain the maximal tardiness same whereas still providing minute throughput times on the middle.

The queue is further divided into two subsequences. The high priority queue consists of those operations for that tsj < maxJ  oj  oi, that is the operations such have negative slack or might acquire negative slack because of the scheduling of several other operations before operation j. These dangerous operations are ordered as per to the above Eq. (6). The uncritical operations are scheduled as per to the ODD rule.

This is obvious that the WLS rule is an extremely good compromise among the two classes of rules. For extensive queues and high pressure, this dominates SL/OPN both in Tmean and Trms,

and it performs well in all situations while avoiding extreme values of Tmax. Thus, it can be  said  that  it  is  prime  candidate  for  a  good  simple  priority  rule  especially  in decentralized scheduling.

Posted Date: 3/5/2013 8:06:03 AM | Location : United States







Related Discussions:- New rule with local one step ahead prediction: wls rule, Assignment Help, Ask Question on New rule with local one step ahead prediction: wls rule, Get Answer, Expert's Help, New rule with local one step ahead prediction: wls rule Discussions

Write discussion on New rule with local one step ahead prediction: wls rule
Your posts are moderated
Related Questions
1. Production Capacity : Machines idled by breakdowns cannot produce thus the capacity of the systems is reduced. 2. Production cost: Labor costs per unit rise beca

This assignment will simulate large deformations (nonlinear geometry) and occurrence of necking and buckling due to static tensile and compressive loading of a given elastic-plasti

Chain conveyors consists of overhead mounted endless chain. It is supported from the ceiling and has a fixed path to travel. It saves valuable floor space. The arrangement i


Q. Corrosion in Boiler? With proper BFW treatment, and maintaining pH within a certain range (9.2 to 9.4) and removing oxygen from the system, a stable passive film will be for

calculate carbide tool and you are required to turn 60mm dia piece of C20

A steel tube of 30 mm external diameter and 20mm internal diameter encloses a copper rod of 15mm diameter to which it is rigidly joined at each end. If at a temperature of 10 o C,

Q. What is Epoxy Powder? The coating manufacturer shall be consulted as to the product best suited to the Applicator's speed of coating, pipe diameter and wall thickness, and t

Confined Space Standard Various examples of workplace exist in industrial practice where spaces are characterized by several restrictions. Such spaces are identified as: manh

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same  which one of the following will not be affected? Solution) In free space, nei