Problems of Qualitative Change of Parameters in Different Hierarchical Levels

  • E. Apelt
  • D. Apelt
Conference paper
Part of the Advances in Simulation book series (ADVS.SIMULATION, volume 1)


Technical, economic and social connections can be modelled on different levels of structure. The interaction of aggregates within a production unit or the relation between systems of material processing within the economy are different examples of technological systems. For this, in general, models will be elaborated, in which all system-elements as well as all parameters, describing the system-elements, correspond a priori to the given aggregation level- In this case models of different aggregation level primarily are based on different databases. Two procedures are usual:
  1. 1

    Extent and aggregation level of the model is fixed (inflexible models)

  2. 2

    The model will be internally generated from database. The extent of the model can be changed by addition or omission of homogenous elements (quantitatively variable models)


An advantage in modelling complex connections in hierarchically built systems can be achieved, if it is possible to generate models from a homogenous database not only by addition or omission of single elements but also to choise the hierarchical level. The problem in this type of procedure is, that a change of hierarchical level is connected with aggregation or disaggregation of elements- This can lead to a change of properties of parameters.


Expert System Hierarchical Level Single Element Aggregation Level Abstraction Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Akademie-Verlag Berlin 1988

Authors and Affiliations

  • E. Apelt
    • 1
  • D. Apelt
    • 2
  1. 1.AdW der DDRInstitut für chemische TechnologieBerlinGermany
  2. 2.Humboldt-Universität BerlinBereich AsienwissenschaftenBerlinGermany

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