Browsing by Author "Genc, Burkay"

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Citation - WoS: 7
Citation - Scopus: 10
Extending a sentiment lexicon with synonym-antonym datasets: SWNetTR plus
(Tubitak Scientific & Technological Research Council Turkey, 2019) Saglam, Fatih; Sever, Hayri; Genc, Burkay; Sever, Hayri; 11916; Bilgisayar Mühendisliği
In our previous studies on developing a general-purpose Turkish sentiment lexicon, we constructed SWNetTR-PLUS, a sentiment lexicon of 37K words. In this paper, we show how to use Turkish synonym and antonym word pairs to extend SWNetTR-PLUS by almost 33% to obtain SWNetTR++, a Turkish sentiment lexicon of 49K words. The extension was done by transferring the problem into the graph domain, where nodes are words, and edges are synonym- antonym relations between words, and propagating the existing tone and polarity scores to the newly added words using an algorithm we have developed. We tested the existing and new lexicons using a manually labeled Turkish news media corpus of 500 news texts. The results show that our method yielded a significantly more accurate lexicon than SWNetTR-PLUS, resulting in an accuracy increase from 72.2% to 80.4%. At this level, we have now maximized the accuracy rates of translation-based sentiment analysis approaches, which first translate a Turkish text to English and then do the analysis using English sentiment lexicons.
Citation - WoS: 1
Citation - Scopus: 2
Identifying criminal organizations from their social network structures
(Tubitak Scientific & Technological Research Council Turkey, 2019) Cinar, Muhammet Serkan; Sever, Hayri; Genc, Burkay; Sever, Hayri; 11916; Bilgisayar Mühendisliği
Identification of criminal structures within very large social networks is an essential security feat. By identifying such structures, it may be possible to track, neutralize, and terminate the corresponding criminal organizations before they act. We evaluate the effectiveness of three different methods for classifying an unknown network as terrorist, cocaine, or noncriminal. We consider three methods for the identification of network types: evaluating common social network analysis metrics, modeling with a decision tree, and network motif frequency analysis. The empirical results show that these three methods can provide significant improvements in distinguishing all three network types. We show that these methods are viable enough to be used as supporting evidence by security forces in their fight against criminal organizations operating on social networks.