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Search: L773:1896742599

  • Result 1-2 of 2
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1.
  • Noreus, Olof, et al. (author)
  • Estimation of Missing Data for Model Validation
  • 2000
  • In: Control Systems, Preprints, Conference. - : TAPPI Press. - 1896742599 ; , s. 89-95
  • Conference paper (other academic/artistic)abstract
    • To be able to validate models based on signals logged from processes, it is necessary to have a continuous data set. Since missing data is a common problem when logging process variables, it can be almost impossible to find a continuous data set. In general it might be necessary to replace missing data also when estimating models for the signals and this paper compares different approaches for missing data estimation. The result shows that on the available data set there is no significant difference in the performance and for the model validation problem it is probably enough to use the simplest method. However, for other applications and on other data sets, there are probably important differences.
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2.
  • Åström, Karl Johan (author)
  • Control Problems in Paper Making - Revisited
  • 2000
  • In: Quantifying the benefits of process control. Conference Proceedings Preprints. - 1896742599 ; , s. 129-136
  • Conference paper (other academic/artistic)abstract
    • This paper looks at process control in the pulp and paper industry from the perspective of pioneering work carried out in the early 1960s. One of the aims of the Billerud-IBM Project was to explore the technical and economical advantages that could be obtained by using a digital computer for control and supervision of a paper machine. The study also explored the features of a digital computer that were useful for control of industrial processes. Details on the work on modelling are presented. The author of this paper also gives some personal reflections on: drastic changes in the industry; system deficiencies; process control technology; user's views; autonomous control; supply of competent personnel and codesign of processes and controllers
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  • Result 1-2 of 2
Type of publication
conference paper (2)
Type of content
other academic/artistic (2)
Author/Editor
Åström, Karl Johan (1)
Isaksson, Alf J. (1)
Gulliksson, Mårten (1)
Noreus, Olof (1)
University
Lund University (1)
Mid Sweden University (1)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (1)
Engineering and Technology (1)
Year
2000 (2)

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