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Outline. detailed operations Model 04-02 Model 04-03 Model 04-04 general usage of ARENA. Part A. Process A. EXPO(5). Tria(1,4,8). Rework. 9\%. Part B. 91\%. Process B. Batches of 4 EXPO(30). Shipped. Tria(3,5,10). Electronic Assembly/Test System. Scrapped.

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outline
Outline
  • detailed operations
    • Model 04-02
    • Model 04-03
    • Model 04-04
  • general usage of ARENA
electronic assembly test system
Part A

Process A

EXPO(5)

Tria(1,4,8)

Rework

9%

Part B

91%

Process B

Batches

of 4 EXPO(30)

Shipped

Tria(3,5,10)

Electronic Assembly/Test System

Scrapped

Part A TRIA(1,3,4)

Part B WEIB (2.5, 5.3)

20%

80%

EXPO(45)

Salvaged & Shipped

Sealer

models
Models
  • Model 4.1: basic
  • Model 4.2: resource schedule, resource failure, frequency – time persistence statistics
  • Model 4.3: changing animation queue, changing entity picture, adding resource picture, adding variables and plots
  • Model 4.4: using modules in Advanced Transfer
model 04 01
Model 04-01
  • ignore details
    • the 2-minute traveling times
    • the working hours of stations
    • schedule of the re-workers
    • failure of the sealer
    • the number of racks used
new features of model 04 02 refinements of model 04 01
New Features of Model 04-02: Refinements of Model 04-01
  • run length 10 days, 16 hours per day
  • two 8 hr shifts / day
    • 1 re-worker in the first shift
    • 2 re-workers in the second shift
  • sealer may break down
    • life time expo(120)
    • repair time expo(4)
  • statistics of the status of sealer: on and off
  • statistics of the rework queue (distribution of # of racks)
    • each rack possible to hold 10 items
schedule of the rework station
Schedule of the Rework Station
  • define schedule of re-workers (Schedule module)
  • associate the schedule with the (resource of the) re-work station
    • option on resource when a service is interrupted: ignore, wait, preempt
  • modify the # of hours per day to suit the schedule
failure of resource
Failure of Resource
  • define a failure (Failuremodule in Advanced Processes)
  • associate the failure with a resource
  • the treatment of incomplete work at a failure
    • same as schedule: ignore, wait, and preempt
collect statistics
Collect Statistics
  • to get time-in-system statistics of a type of entities (customer-average statistics)
    • use Record module
    • record exit time - creation time
    • compile statistics
  • to get time-persistent statisticsof a collection of values of variables or a collection of states of resources
    • use Statisticsmodule (in Advance Process Template)
    • may need to self-define categories
statistics for racks and for sealers
Statistics for Racks and for Sealers
  • time-persistent statistics –Statistics module
  • statistics on sealer status
    • fraction of idle, failed, and busy time of sealer
  • statistics on number of racks needed
    • fractions of time for different number of racks used
new features of model 04 03 refinements of model 04 02
New Features of Model 04-03: Refinements of Model 04-02
  • animation of queues
    • length and points of queues
  • changing entity pictures
    • creating new one: copy, edit, and assign entity picture
  • adding resource pictures
    • creating resource picture from animation tool bar
  • adding variable plots
new features of model 04 04 refinements of model 04 03
New Features of Model 04-04: Refinements of Model 04-03
  • saving connection links by station and route modules
    • stations: module for program and icon for animation
    • route: module for program and icon for animation
  • changing an entity picture
yield management
Yield Management
  • C = capacity of plane, 100
  • Q = # of reservations allowed
  • X = actual # of passengers appear
    • ~ Binomial (Q, 0.95)
  • V= net profit
    • = 1600X – 40000 – 180 min(X, C)- 2500 max(X-C, 0)
  • result: Q* = 106
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