OR In SCM at Karlsruher Institut Für Technologie | Flashcards & Summaries

Lernmaterialien für OR in SCM an der Karlsruher Institut für Technologie

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Bin Packing Problems

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packing items of different volumes into a finite number of objects (bins) of given capacity such that the number of bins used is minimized

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APS: demand planning

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  • forecasts of future costs and trends of the demand for long-, mid- and short-term
  • historical data + market analysis
  • cross-divisional functionality
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The Wagner-Whitin algorithm

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  • Exact solution by a dynamic programming algo
  • Bellmans principle of optimality
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Complexity of SALB

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  • no hope for finding an optimization polynomial time algorithm
  • SALB is NP-hard
  • there are a number of related combinatorial optimization problems for which elaborated algorithms exist that make the SALB problems tractable for commercial MIP solvers
    • assignment, sequencing, grouping, selection problems
  • exact solution methods
    • branch and bound
    • dynamic programming
  • for large problems: heuristic
Lösung ausblenden
TESTE DEIN WISSEN

Mult-Item Models (time varying demand): Joint fixed (setup) costs


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TESTE DEIN WISSEN
  • more realistic, when a joint fixed (setup) cost Ko --> incurred whenever any product is ordered
  • problem is NP-complete and mainly treated by heuristics
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classical supply chain dimensions

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--> structure the complex planning processes in a supply chain in a hierachical manner


  • functional dimension (supply chain process)
    • procuremnet, production, distribution, sales
  • time dimension (planning horizon)
    • long term strategic
    • mid term tactical
    • short term operational
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Operations and supply chain strategy

--> infrastructural elements

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  • intangible resources (poeple, policies, ...)
  • as important as structural elements
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Characteristics of SCM

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  • takes into account every facility
  • objective of SCM is to be efficient and cost-effective across the entire system
  • SCM encompasses the firms activities at many levels
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Definition Supply Chain Management

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It is a decision making process that
aims at optimizing overall supply chain performance


  • SCM is a set of approaches utilized to efficiently integrate 
  • suppliers, manufactures, warehouses... 
  • so that merchandise is produced and ditributed 
  • in order to minimize systemwide costs 
  • or maximize total profit 
  • while satisfying service level requirements
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Defintion Processes

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processes represent individual activities involved in producing and distributing goods and services


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time dimension of SCM --> strategic level

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TESTE DEIN WISSEN
  • deals with high capital cost decisions that have a long-range scope and a long-lasting effect
  • data is aggregated, based on forecasts, often incomplete or imprecise
  • strategic decisions focus on th development of objectives
    • where to locate facilities
    • how many new facilities
    • which suppliers should be used
    • ...
Lösung ausblenden
TESTE DEIN WISSEN

Functional dimension of SCM

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TESTE DEIN WISSEN
  • procurement
    • provide resources necessary for production
  • production
    • determinaation of production locations, times and quantities
  • distribution
    • choice of transport routes
  • sales
    • planning processes concerned with customer order and demand forecast
Lösung ausblenden
  • 69805 Karteikarten
  • 1770 Studierende
  • 192 Lernmaterialien

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Q:

Bin Packing Problems

A:

packing items of different volumes into a finite number of objects (bins) of given capacity such that the number of bins used is minimized

Q:

APS: demand planning

A:
  • forecasts of future costs and trends of the demand for long-, mid- and short-term
  • historical data + market analysis
  • cross-divisional functionality
Q:

The Wagner-Whitin algorithm

A:
  • Exact solution by a dynamic programming algo
  • Bellmans principle of optimality
Q:

Complexity of SALB

A:
  • no hope for finding an optimization polynomial time algorithm
  • SALB is NP-hard
  • there are a number of related combinatorial optimization problems for which elaborated algorithms exist that make the SALB problems tractable for commercial MIP solvers
    • assignment, sequencing, grouping, selection problems
  • exact solution methods
    • branch and bound
    • dynamic programming
  • for large problems: heuristic
Q:

Mult-Item Models (time varying demand): Joint fixed (setup) costs


A:
  • more realistic, when a joint fixed (setup) cost Ko --> incurred whenever any product is ordered
  • problem is NP-complete and mainly treated by heuristics
Mehr Karteikarten anzeigen
Q:

classical supply chain dimensions

A:

--> structure the complex planning processes in a supply chain in a hierachical manner


  • functional dimension (supply chain process)
    • procuremnet, production, distribution, sales
  • time dimension (planning horizon)
    • long term strategic
    • mid term tactical
    • short term operational
Q:

Operations and supply chain strategy

--> infrastructural elements

A:
  • intangible resources (poeple, policies, ...)
  • as important as structural elements
Q:

Characteristics of SCM

A:
  • takes into account every facility
  • objective of SCM is to be efficient and cost-effective across the entire system
  • SCM encompasses the firms activities at many levels
Q:

Definition Supply Chain Management

A:

It is a decision making process that
aims at optimizing overall supply chain performance


  • SCM is a set of approaches utilized to efficiently integrate 
  • suppliers, manufactures, warehouses... 
  • so that merchandise is produced and ditributed 
  • in order to minimize systemwide costs 
  • or maximize total profit 
  • while satisfying service level requirements
Q:

Defintion Processes

A:

processes represent individual activities involved in producing and distributing goods and services


Q:

time dimension of SCM --> strategic level

A:
  • deals with high capital cost decisions that have a long-range scope and a long-lasting effect
  • data is aggregated, based on forecasts, often incomplete or imprecise
  • strategic decisions focus on th development of objectives
    • where to locate facilities
    • how many new facilities
    • which suppliers should be used
    • ...
Q:

Functional dimension of SCM

A:
  • procurement
    • provide resources necessary for production
  • production
    • determinaation of production locations, times and quantities
  • distribution
    • choice of transport routes
  • sales
    • planning processes concerned with customer order and demand forecast
OR in SCM

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