WEBSOM is a method in which the self-organizing map algorithm is used to automatically organize collections of documents on a map to enable easy exploration of the collection. This article illustrates with case studies how collections of various types of text can be successfully organized using the WEBSOM. The emphasis is on describing the particular challenges that each type of material poses,...

Automatic structuring is one means to ease access to document collections, be it for organization or for exploration. Of even greater help would be a presentation that adapts to the user’s way of structuring and thus is intuitively understandable. We extend an existing useradaptive prototype system that is based on a growing self-organizing map and that learns a feature weighting scheme from a ...

The original Self-Organizing Feature Map (SOFM) has been extended in many ways to suit different goals and application domains. However, the topologies of the map lattice that we can found in literature are nearly always square or, more rarely, hexagonal. In this paper we study alternative grid topologies, which are derived from the geometrical theory of tessellations. Experimental results are ...

Hydrologic regionalization deals with the investigation of homogeneity in watersheds and provides a classification of watersheds for regional analysis. The classification thus obtained can be used as a basis for mapping data from gauged to ungauged sites and can improve extreme event prediction. This paper proposes a wavelet power spectrum (WPS) coupled with the self-organizing map method for c...