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Summary

Summary Operations Management

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  • Course
  • Operations Management
  • Institution
  • Hogeschool Windesheim (HW)

This summary shows the main topics of this course. This is part of the exam simulation. This summary contains chapter 5 and chapter 8 of the book operations management 12th edition. There is also chapter 5 of the book Russell which deals with Waiting line theories.

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Document information

  • May 23, 2022
  • 4
  • 2021/2022
  • Summary

Subjects

  • forecasting
  • constraint management
  • theory of constraints
  • idle time
  • effiiciency
  • time series method
  • trend patterns
  • seasonal patterns
  • waiting line theories singele and multiple server model

Written for

  • Hogeschool Windesheim (HW)
  • Technische Bedrijfskunde
  • Operations Management
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Samenvatting OPM
Precedence diagram = A diagram that allows one to visualize immediate predecessors
better
- Activity-on-node (AON) = an approach used to create a network diagram, in which
nodes represent activities and arc represent the precedence relationship between
them.

Constructing a precedence diagram:
Desired output rate = Ideally is matched to the staffing or production plan
Cycle time = Maximum time allowed for work a unit at each station
Theoretical Minimum (TM) = benchmark or goal for the smallest number of
stations possible
- = total time required to assemble each unit
Idle time = the total unproductive time for all stations in the assembly of each unit
Efficiency = the ratio of productive time to total time, expressed as a percent



Balance Delay = the amount by which efficiency falls short of 100%
o Balance Delay (%) = 100% - Efficiency

Notatie Operating Characteristic
r Desired output rate in units per hour
c Cycle time in hours
TM Theoretical minimum
n Number of stations
Total time required to assemble each unit
L Average number of customers in the system (waiting and being served)
Lq Average number of customer in the waiting line
W Average time a customer spends in the system (waiting and being
served)
Wq Average time a customer spends waiting
P0 Probability of no customers in the system
Pn Probability of n customers in the system
ρ Utilization rate; the portion of time the system is in use
Et Forecast error for period t
Dt Actual demand in period t
Ft Forecast for period t
Y Dependent variable
X Independent variable
a Y-intercept of the line
b Slope of the line

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