Formal concepts and closed itemsets proved to be of big importance for knowledge
discovery, both as a tool for concise representation of association rules and a tool for …

Abstract In Formal Concept Analysis (FCA), a concept lattice graphically portrays the
underlying relationships between the objects and attributes of an information system. One of …

Customer support systems based on chatbots gain an increasing popularity. Chatbots are
becoming more and more important to a plethora of applications not only for social services …

Decision trees and their ensembles are very popular models of supervised machine
learning. In this paper we merge the ideas underlying decision trees, their ensembles and …

The research of object-oriented concept is one of the basic contents of formal concept
analysis. To overcome the complexity of computing object-oriented concept, this paper …

Discovery of the pattern search space is an essential component of Itemset Mining. The most
common approach to reduce pattern search space is to compute only frequent closed …

With this dissertation, I have finished a big and very important part of my life. I have given all
my enthusiasm, put a lot of effort to arrive at this point, but it would not have been possible …

Abstract Information retrieval (IR) chatbot is a special class of virtual assistants, which is
widely used nowadays in customer support services. However, the work of modern IR …