SEA TAC example

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SEA TAC example

• 2 types of customers, coach arrival rate exp
  m1min 1st class arrival rate uniform 4-5min.
  1 Q for each class of customer, 1 server for 1st
  class uniform 5-8 mins, 4 servers for coach, 1_at_
  normal m15 sd5, 3_at_ uniform 5-10 min. How long
  each type of customer in line

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Chapt 7 (portions)

• Read/ Write Nodes (pgs 222-228)
• Assembly Modeling (pgs 239-262)
• Accumulate Node
• Batch/ Unbatch Node
• Control Statements

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Interface Assembly

• Build on Basic concepts from chapters 5 6
• Able to integrate/ interface software with other
  programs
• Provided by reading inputs from files,
  spreadsheets, databases
• Then outputted to files, spreadsheets..
• Able to model the assembly of entities into a
  single entity ie CPM, collect up to a certain
  then release entities
• Also retrieve entities that were combined, ie
  separate parts after they were batched together
  for a specific process

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Read Node

• Used to read one or more values from an external
  file
• Table 2.9 Users Guide

Node readin Read from spreadsheet three columns
of data 3 branches
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Write Node

• Used to write values to an external file ie .xls

Called sentoxls put in file called
airportque.xls send TNOW ATRIB(2) real values 3
decimal pt 1 following
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Write Example

• Single server to obtain table with 4 columns,
  entity , arrival time, wait time, system time

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Assembly Modeling

• Wait until four units of a order arrive before
  boxing and shipping
• Start an operation that needs one bolt, one
  washer, one nut, spud wrench
• Start activity pour foundation once activities
  of unslab elect, underslab, plumb, gravel
  compact are completed
• Accumulate
• Batch
• Unbatch

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Accumulate Node

• Collect entities until a certain number are
  reached
• When achieved the node is released

Save atrib of entity of
SR til subsequent release
of branches
FR til 1st release
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• Pert example

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• Pert example

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Batch Node

• Collect entities until a certain number are is
  reached
• Then release a single entity that represents the
  batch
• Typically used for modeling pallets and loads of
  cars/ trucks that accumulate before moving

Collecting values on ATRB..then released
Batch from when
Sorted on /default 1
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UnBatch Node

• Put entities of a batch back into the network or
  split an entity into multiple units
• Individual entities of the batch are restored

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• Batch Unbatch example

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• Batch Unbatch example

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Chapt 7 examples

• Read example
• 7-1 read the following into a model, valuse of
  ATRIB0, ATRIB1 and LTRIB1 from file
  ATTRIBUTES.DAT for 1000 entities

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Chapt 7 examples

• Write example
• 7-2 (b) write out the values of current simulated
  time, the first real attribute, and the first
  integer attribute of the current entity to the
  file TRACE.DAT

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Chapt 7 examples

• 7-9 Use ACCUMULATE toa) all preceding activities
  must be completed before a successor can be
  started, b) any one activity must be
  completed before a follow one activity can be
  completed, c) 3 out of 5 activities must be
  completed before an activity can be completed
• a)

3 predecessors
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Chapt 7 examples

• 7-9 Use ACCUMULATE to b) any one activity must
  be completed before a follow one activity can be
  completed, c) 3 out of 5 activities must be
  completed before an activity can be completed
• b)

1 predecessors
Or use
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Chapt 7 examples

• 7-9 Use ACCUMULATE toc) 3 out of 5 activities
  must be completed before an activity can be
  completed
• c)

1 predecessors
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PERT Example

• Collect entities until a certain number are is
  reached
• When achieved the node is released
• Concrete slab after excavation

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PERT Example

• Concrete slab after excavation

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Control Statements

• Class assignment
• simulate model shown in figure 7-1 of book
• show out put on xls chart
• due 11/26

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Where are we going

• Skip Chapt 8, will do Chapt 9 11/19
• Chapt 10 11/26
• No class 12/3
• Projects due 12/10