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- János Abonyi, Balazs Feil, Sandor Z. Németh, Peter Arva
- Fuzzy Sets and Systems
- 2005

The partitioning of a time-series into internally homogeneous segments is an important data mining problem. The changes of the variables of a multivariate time-series are usually vague and do not focus on any particular time point. Therefore it is not practical to define crisp bounds of the segments. Although fuzzy clustering algorithms are widely used to… (More)

Segmentation is the most frequently used subroutine in clustering, indexing, summarization, anomaly detection, and classification of time series. Although in many real-life applications a lot of variables must be simultaneously monitored, most of the segmentation algorithms are used for the analysis of only one time-variant variable. Hence, this paper… (More)

- János Abonyi, Balazs Feil, Sandor Z. Németh, Peter Arva
- IDA
- 2003

The segmentation of time-series is a constrained clustering problem: the data points should be grouped by their similarity, but with the constraint that all points in a cluster must come from successive time points. The changes of the variables of a time-series are usually vague and do not focused on any particular time point. Therefore it is not practical… (More)

- János Abonyi, Sandor Z. Németh, Csaba Vincze, Peter Arva
- Computers in Industry
- 2003

The huge amount of data recorded by modern production systems definitely have the potential to provide information for product and process design, monitoring and control. This paper presents a soft-computing based approach for the extraction of knowledge from the historical data of production. Since Self-Organizing Maps (SOM) provide compact representation… (More)

- Balazs Feil, János Abonyi, +4 authors Gabor Nagy
- ICAISC
- 2004

Nonlinear state estimation is a useful approach to the monitoring of industrial (polymerization) processes. This paper investigates how this approach can be followed to the development of a soft sensor of the product quality (melt index). The bottleneck of the successful application of advanced state estimation algorithms is the identification of models… (More)

- Balazs Feil, János Abonyi, Sandor Z. Németh, Peter Arva
- Computers & Chemical Engineering
- 2005

Time-series segmentation algorithms, such as methods based on Principal Component Analysis (PCA) and fuzzy clustering, are based on input-output process data. However, historical process data alone may not be sufficient for the monitoring of process transitions. Hence, the key idea of this paper is to incorporate the first-principle model based state… (More)

Process manufacturing is increasingly being driven by market forces and customer needs and perceptions, resulting in necessity of flexible multi-product manufacturing. The increasing automation and tighter quality constraints related to these processes make the operator's job more and more difficult. This makes decision support systems for the operator more… (More)

- Peter Pach, Balazs Feil, Sandor Z. Németh, Peter Arva, János Abonyi
- IEEE Trans. Systems, Man, and Cybernetics, Part A
- 2006

Fuzzy decision tree induction algorithms require the fuzzy quantization of the input variables. This paper demonstrates that supervised fuzzy clustering combined with similarity-based rule-simplification algorithms is an effective tool to obtain the fuzzy quantization of the input variables, so the synergistic combination of supervised fuzzy clustering and… (More)

Selecting the embedding dimension of a dynamic system is a key step toward the analysis and prediction of nonlinear and chaotic time-series. This paper proposes a clustering-based algorithm for this purpose. The clustering is applied in the reconstructed space defined by the lagged output variables. The intrinsic dimension of the reconstructed space is then… (More)