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With the wide-spread application of process models and simulators, estimation of model parameters becomes a crucial project. In chemical industry the processes are mostly highly non-linear which makes the identification of model parameters difficult. In the practice the process simulators are not just for design but optimization of operating plants in numerous cases various sets of process data is available to determine the necessary model parameters. With further examination of the historical process data, a new possibility becomes applicable: some time-series segments can provide more information about the estimated model parameters than other parts of the recorded time-series.
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