Analýza obsahu webových diskuzních fór jako zdroj dat pro výzkum nových trendů v užívání psychoaktivních látek ve srovnání s daty získanými od jiných populací Mgr. Eva Drápalová ABSTRACT Background: One of the most significant new trends in substance abuse today is an unprecedented rate of new psychoactive substances (NPS) emergence on a global drug market. While collection of scientific data about the effects and risks of numerous NPS is a timely process, the substantial amount of information about the very same substances is being exchanged on drug discussion forums, creating a pool of data with a potential for research of the NPS trend. Aims: This dissertation aims to evaluate a potential of internet discussion forum content analysis methods by (i) describing and comparing the characteristics of discussion forum visitors to NPS users who do not visit such forums; and subsequently by comparing the internet forum content analysis results describing (ii) a prevalence of NPS use, (iii) effects and context of NPS use and (iv) discussed internet retailers selling NPS with data retrieved by other methods. Methods: Differences between two groups of internet survey respondents were analyzed using Pearson Chi-square and Student's t-test to address the first aim of this dissertation. Furthermore the results of both...

In a learning community, conventional discussion forums are integral to webbased interventions in traditional classrooms as well as on-line learning environments. Despite popular belief that they are a great success in fostering deep and meaningful discussions and support active learning; research has found that there are millions of messages posted by users to express such an opinion, but it is hard to be directly delivered to all users. Finally there are millions of postings in databases across the country stored away and never reused. This thesis introduces a PhD student’s current research work. It proposes a distributed intelligent discussion forum system dedicated to supporting both students and teachers. The system is developed with the primary goal of reducing the number of problems associated with conventional discussion forum systems in web-based environments and improving the effectiveness of dialogue between students with each other and with teachers so that it can enhance each individual student’s ability to share and learn knowledge.