Chapt 6 Resources - PowerPoint PPT Presentation

Loading...

PPT – Chapt 6 Resources PowerPoint presentation | free to download - id: 14aa9-ZWNlN



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Chapt 6 Resources

Description:

Hand draw tonight....Turn next week a printed version sing AweSim software, a ... inspector also does adjustment, can't be used for insp when performing adjust ... – PowerPoint PPT presentation

Number of Views:48
Avg rating:3.0/5.0
Slides: 31
Provided by: cwu
Learn more at: http://www.cwu.edu
Category:
Tags: chapt | insp | resources

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Chapt 6 Resources


1
Chapt 6 Resources Gates
  • Intro/ steps in the process
  • Distributions...What Why
  • Resource Block
  • Await Node
  • Free node
  • Alter node
  • Group block
  • Open Node
  • Close node
  • Examples

2
Quiz non attributional
Activity AWAIT COLCT CREATE Entity
TERMINATE QUE ATRB NNQ GOON
  • Object flow thru network_________
  • Node that is an entry point in to a system______
  • Data attached to an entity________
  • A symbol that can represent the passage of
    time____
  • Node that generates a histogram______
  • Node that represents people or item waiting in
    line___

3
Quiznon attributional
  • Hand draw tonight.Turn next week a printed
    version sing AweSim software, a single server
    operation of a 7-11 store using AweSim objects,
    customers arrive at the counter at a rate that is
    Exponentially distributed with a mean of 4.5
    minutes, the duration of the service time is
    normally distributed with a mean of 3.2 minutes
    and a standard deviation of 0.6 minutes, end the
    simulation after 1000 customers. Collect data to
    be able to produce a histogram of how long
    customers are in the system.

4
Distributions
  • Use statistical distribution to represent your
    data or when an approximation is required.
  • Want to simulate arrival times of customers can
    either
  • Collect data, use real datamust collect vast
    amounts
  • Collect representative sample of data, use
    distribution that best represents the data for
    the population
  • Have little or no data and make rough
    approximations of the expected population

5
Uniform Distribution
  • Used to generate random numbers between a range.

6
Exponential Distributions
  • Used to represent the arrival or service time
    time of random variables. Also used to represent
    time to failure.

7
Normal Distributions
  • Use statistical distribution to represent your
    data or when an approximation is known. Commonly
    used for service times.

8
Triangular Distributions
  • Used when only an approximation of the population
    is known. Used for service times.

9
Introduction
  • Entities move thru the networkwaits at
    quesencounters activities that take time
  • Can also model networks where the entity requires
    a resource to perform an activity
  • Entity picks up resources at an AWAIT Node before
    going on to an activity
  • Resource block dictates the priorities of
    resources
  • Gate Nodes start stop entity flow

10
RESOURCE Block
  • Block entities do not flow thru, no in/ out
  • Identifies resource name/ label RLBL, initial
    of resource units available CAP, order which
    to AWAIT PREEMPT allocate resources
  • Resource 1, called ScrapeMetal, capacity of
    1000, files 3 7 will be polled for entities
    waiting for ScrapeMetal

11
AWAIT Node
  • Used to store entities waiting for units of
    resources or a GATE to open
  • AWAIT Node called Needbooks, entity requires 2
    units of the resource BOOKS, if available they
    are allocated to the entity branches M1, no
    limit for of entity that can wait in file 1.

12
AWAIT Node
  • AWAIT Node called Needbooks1, of books
    required by entity is prescribed by the value of
    attribute (4), if available they are allocated to
    the entity branches M2, no limit for of
    entity that can wait in file 1.

13
FREE Node
  • FREE Node used to release units of resources when
    entity arrives at the node
  • Node called Freeupbooks, 4 BOOKS are made
    available when entity arrives

14
Inspector considered as a resource Ex
  • TVs in a production line get inspected, go to
    packing or need to be adjusted, inspector also
    does adjustment, cant be used for insp when
    performing adjust

15
Flex Machining System Ex
  • Under const

16
ALTER Node
  • Used to change the capacity of a resource type by
    CC units, increased, - Decrease
  • Decrease resource BOOKS by 3

17
Group Block
  • Provides a method of grouping resources so that
    any member of the group can be used to provide
    service to an entity
  • 3 examples of Group resources of BOOKS, Pencils,
    Packs

L IDLE
FM PREFERRED ORDER
NEXT FREE
18
PREEMPT Node
  • Similar to AWAIT but an entity can preempt one
    unit of a resource that has been allocated to
    another entity
  • High priority to preempt 2 units of resource
    Books put remaining resource in attribute 2

19
Machine tool w/ breakdowns Ex
  • Parts are sent to Drill, Drill machine breaks
    down, which stops the processing of parts except
    by hand. Drill is modeled as a resources parts
    require one unit of Drill. An entity representing
    Drill status is modeled in a disjoint network,
    delayed by time to failure, after which the Drill
    status arrives to a PREEMPT node. PREEMPT stops
    drilling by Drill, the part is drilled by hand
    it takes twice as long

20
Parts are sent to Drill, Drill machine breaks
down, which stops the processing of parts except
by hand. Drill is modeled as a resources parts
require one unit of Drill. An entity representing
Drill status is modeled in a disjoint network,
delayed by time to failure, after which the Drill
status arrives to a PREEMPT node. PREEMPT stops
drilling by Drill, the part is drilled by hand
it takes twice as long
Byhand
PREEMPT
21
GATE Block
  • Provides a method of grouping resources so that
    any member of the group can be used to provide
    service to an entity
  • Ex LABELEDGATE is open, file 1

22
OPEN Node
  • Used to open a gate with a gate label (GLBL) or
    gate code specified by an expression
  • Ex Open gate, called Exampleopengate is used to
    open gate gatetomtl

23
CLOSED Node
  • Used to close a gate with a gate label (GLBL) or
    gate code specified by an expression
  • Ex Close Gate, closegate, closes gate called,
    closetofuel

24
Gates to Model Shifts Ex
  • Model the activity of a process only in operation
    during the day shift. Entities arrive and routed
    to an AWAIT node that is associated with the gate
    called dayshift. In a disjoint network an entity
    is created that closed the gate after 8 hours
    and opens it 16 hours later

25
Model the activity of a process only in operation
during the day shift. Entities arrive and routed
to an AWAIT node that is associated with the gate
called dayshift. In a disjoint network an entity
is created that closed the gate after 8 hours
and opens it 16 hours later
Close gate
Open gate
26
Exercises
  • 6-2 two types of customers 1) regular, uniform
    distributed btwn 15-20 min, 2) harder, expon
    distributed , mean 20 min. 60 are regular
    customers, 40 harder. Customers arrive at a
    rate represented with a triangular distribution
    min 10, max 50, mode 20. Find statistics
    that represent time in system, Use AWAIT/FREE

Customer in
Customer Serviced
Customer out
27
Exercises
  • 6-2 two types of customers 1) regular, uniform
    distributed btwn 15-20 min, 2) harder, expon
    distributed , mean 20 min. 60 are regular
    customers, 40 harder. Customers arrive at a
    rate represented with a triangular distribution
    min 10, max 50, mode 20. Find statistics
    that represent time in system, Use AWAIT/FREE

28
Exercises
  • Person arrives at bank cant find parking drives
    around block comes back parks.

29
ExercisesDue Monday 10/29
  • 6-9 Machine tool processes 2 diff parts. T1
    arrival time is tri dis 20-30-50. Interarrival
    time of T2 tri dis 35-50-60. Processing time for
    T1 is exp, m20, T2 uniform min 15- max 20.
    Processing includes inspection, 1 fail, return
    to que the rework time 90 of original. Find
    time in system of part utilization of machine.
    Use create/ await/ a conditional split of
    activities/ free/ collect/ terminate.

30
Chapt 5 Basic Network Modeling
  • Intro/ steps in the process
  • Single server queuing system
  • CREATE Node
  • TERMINATE Node
  • ASSIGN Node
  • GOON Node
  • COLCT Node
  • SELECT Node
  • EXAMPLES
About PowerShow.com