Tomasz Rutkowski, Krystian Łapa and Radosław Nielek
This paper presents a novel approach to the design of explainable recommender systems. It is based on the Wang–Mendel algorithm of fuzzy rule generation. A method for the learning and reduction of the fuzzy recommender is proposed along with feature encoding. Three criteria, including the Akaike information criterion, are used for evaluating an optimal balance between recommender accuracy and interpretability. Simulation results verify the effectiveness of the presented recommender system and illustrate its performance on the MovieLens 10M dataset.
Robert Rozwałka, Tomasz Rutkowski, Wojciech Staręga and Paweł Sienkiewicz
The paper presents data on the occurrence of Thanatus atratus in Poland. The long-lasting confusion in Polish and European literature about the existence of 2 similar species T. atratus / T. vulgaris in Poland is clarified. Diagnostic images of T. atratus reproductive organs of both sexes are presented.
Robert Rozwałka, Tomasz Rutkowski and Paweł Bielak -Bielecki
In Central Europe, as well as in Poland many introduced spider species have been recorded in the past decades. Most of them are from areas with warm climate, and spreading mainly in synanthropic environment, rarely colonizing natural habitats. Results of research, presented in this paper extend the list of Polish synanthropic araneofauna by four species: Latrodectus mactans, Cheiracanthium mildei, Heteropoda venatoria and Heliophanus cf. apiatus. In addition, new findings of rare or rarely collected synanthropic spider species (Nesticella mogera, Scytodes thoracica, Psilochorus simoni, Uloborus plumipes, Parasteatoda tabulata, Steatoda triangulosa, Mermessus trilobatus, Ostearius melanopygius, Hasarius adansoni, Leptorchestes berolinensis, Pseudeuophrys lanigera) are discussed. Presented data enrich our knowledge about distribution of these species in Poland and show new pathways of potential expansion. For Uloborus plumipes and Hasarius adansoni presence of stable, permanent populations is shown. Findings of Mermessus trilobatus and Ostearius melanopygius in open country suggest that these alien species are gradually colonizing natural biotopes.
Łukasz Minkina, Cezary Nowak, BartŁomiej Pacuk, Dawid Marczak, Tomasz Rutkowski, Szymon Konwerski, Andrzej Matusiak and Adam Byk
Data on the distribution of Aegialiinae in Poland are summarized, and some new records are added. Photographs of all the species occurring in Poland and an identification key to them are provided, along with some fresh aspects of their biology. The aedeagus and epipharynx of all species present in Poland are illustrated photographically for the first time.
Robert Rozwałka, Tomasz Rutkowski, Paweł Sienkiewicz and Katarzyna Renn
Talavera aperta is a rare member of the Salticidae (jumping spiders). Its presence in Poland has been questioned. This paper presents data on 20 new localities of this poorly known species and a map of its distribution in western and central Poland. Detailed drawings of the male body, male palps and the female epigynum are also provided. T. aperta was usually collected from dry, sunny habitats, mostly in June, although some specimens were recorded in other months. In winter, spiders of this species were found in shells of small snails (Cepaea spp., Helicella obvia).