Classification of online grooming on chat logs using two term weighting schemes

Due to the growth of Internet, it has not only become the medium for getting information, it has also become a platform for communicating. Social Network Service (SNS) is one of the main platform where Internet users can communicate by distributing, sharing of information and knowledge. Chatting has become a popular communication medium for Internet users whereby users can communicate directly and privately with each other. However, due to the privacy of chat rooms or chatting mediums, the content of chat logs is not monitored and not filtered. Thus, easing cyber predators preying on their preys. Cyber groomers are one of cyber predators who prey on children or minors to satisfy their sexual desire. Workforce expertise that involve in intelligence gathering always deals with difficulty as the complexity of crime increases, human errors and time constraints. Hence, it is difficult to prevent undesired content, such as grooming conversation, in chat logs. An investigation on two term weighting schemes on two datasets are used to improve the content-based classification techniques. This study aims to improve the content-based classification accuracy on chat logs by comparing two term weighting schemes in classifying grooming contents. Two term weighting schemes namely Term Frequency – Inverse Document Frequency – Inverse Class Space Density Frequency (TF.IDF.ICSdF) and Fuzzy Rough Feature Selection (FRFS) are used as feature selection process in filtering chat logs. The performance of these techniques were examined via datasets, and the accuracy of their result was measured by Support Vector Machine (SVM). TF.IDF.ICSdF and FRFS are judged based on accuracy, precision, recall and F score measurement

Lapseealise seksuaalne ahvatlemine: kohtupraktika sotsioloogiline analüüs

Käesoleva bakalaureusetöö eesmärgiks oli teada saada millisel viisil, millises sotsiaalses kontekstis ning millistes keskkondades lapsi seksuaalselt ahvatletakse. Analüüs toetus 2018-2020 aastate Tartu Maakohtu kinnistele kohtutoimikutele. Ohvrid olid keskmiselt vanuses 11-14-aastased, samas nooremad olid vaid 6-aastased. Kannatanuteks olid nii poisid kui tüdrukud. Ahvatlejateks olid üldjuhul inimesed, kellega laps oli varasemalt mingil viisil kokku puutunud, näiteks pereliikmed või tuttavad ning inimesed, kellega tutvuti internetis. Kuna lähedastel inimestel on parem võimalus ohvritele ligi pääseda, esineb sellistel juhtudel rohkem kontaktset väärkohtlemist. Toimepanijad kasutavad erinevaid ahvatlusviise, näiteks seksuaalse sisuga failide näitamist, lapse privaatsete kehaosade katsumist, enese alasti eksponeerimist ja seksuaalsetel teemadel rääkimist. Kui ohver tõrjub toimepanija teod tagasi, kasutatavad toimepanijad sellistel juhtudel ka näiteks ähvardamist, vägivalda või ebaseadusliku jälgimist ja jälitamist. Tulemustest selgus, et kontaktkuritegusid pannakse enamasti toime öösel, samas kui internetis toime pandud kuritegude puhul ajaline faktor niivõrd rolli ei mänginud. Väljaspool virtuaalmaailma pandi kuritegusid toime enamasti ohvri kodus, toimepanija kodus, avalikus kohas ning ühel juhul ka koolis. Internetikeskkondades toimus ahvatlemine Snapchatis, Facebooki Messengeris, Instagramis ning erinevates kohtinguportaalides. Kokkuvõttes võib öelda, et toimepanijad eelistavad pigem haavatavaid ohvreid ja neile mugavat ligipääsu. Seega on oluline pakkuda välja lahendusi, mis aitaksid haavatavaid sihtrühmi paremini seksuaalse ahvatlemise eest kaitsta. Edasised uuringud võiksid keskenduda erinevate veebiplatvormide rollide uurimisele, et paremini mõista, kuidas levinud platvormid seksuaalset väärkohtlemist ja muud ekspluateerivat käitumist võimaldavad ning lihtsustavad. Samuti oleks oluline uurida noorte internetikasutajate häirivaid kogemusi populaarsetes veebikeskkondades ning seda, milliseid toimetulekustrateegiaid sellistes olukordades rakendatakse.https://www.ester.ee/record=b5451209*es

Rhetorical moves and identity performance in online child sexual abuse interactions

Online child sexual abuse (OCSA) is a pervasive problem facilitated by the anonymity afforded to offenders online. From a largely social constructionist perspective, this thesis explores linguistic expressions of identity by participants across a range of OCSA interactions, including offenders and suspected offenders, victims, and undercover police officers. The thesis is structured around three individual studies, each involving a different abusive interaction type. Each study employs Swales’ (1981; 1990) move analysis framework, exploring how participants use rhetorical moves as a resource for identity performance. Study 1 concerns a convicted offender who strategically cycled through numerous adopted personas when interacting with victims online. It considers his performance of various identity positions through his use of rhetorical moves across different personas. One persona is found to diverge significantly from the rest, and is identified as a possible reflection of the offender’s ‘home identity’. Study 2 considers interactions between suspected offenders and undercover police officers posing as offenders. It compares the participants’ move use and explores linguistic realisations of supportive exchanges, finding that aside a few notable differences, undercover officers perform the offender identity similarly to genuine suspected offenders. Study 3 explores dark web forum posts authored by ‘newbies’ attempting to join existing online communities of suspected offenders. It examines the identity positions performed in the posts and considers how positions of competence and expertise contribute to the persuasive process of seeking membership into online offending communities. Taking findings from these studies, the thesis discusses the possible contributions of move analysis to OCSA research and how rhetorical moves are used as a resource for identity performance, and offers an approach to identity analysis based on rhetorical moves. It concludes by arguing for move analysis as a useful goal-centred approach to identity investigation and describes potential implications of this work for law-enforcement, education and research

MUROS DE DISCRIMINACIÓN Y EXCLUSIÓN EN LA CONSTRUCCIÓN DE IDENTIDADES: LA MIRADA DE LAS CIENCIAS SOCIALES

info:eu-repo/semantics/publishedVersio