Ivan Srba

Ivan Srba
Kempelen Institute of Intelligent Technologies

PhD

About

31
Publications
7,344
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401
Citations

Publications

Publications (31)
Article
Full-text available
In the current time of globalization, collaboration among people in virtual environments is becoming an important precondition of success. This trend is reflected also in the educational domain where students collaborate in various short-term groups created repetitively but changing in each round (e.g. in MOOCs). Students in these kind of dynamic g...
Article
Full-text available
Enormous amounts of knowledge sharing occur every day in community question answering (CQA) sites, some of which (for example, Stack Overflow or Ask Ubuntu) have become popular with software developers and users. In spite of these systems' overall success, problems are emerging in some of them - increased failure and churn rates. To investigate thi...
Article
Full-text available
Community question-answering (CQA) systems, such as Yahoo! Answers or Stack Overflow, belong to a prominent group of successful and popular Web 2.0 applications, which are used every day by millions of users to find an answer on complex, subjective, or context-dependent questions. In order to obtain answers effectively, CQA systems should optimally...
Conference Paper
Students' performance in Massive Open Online Courses (MOOCs) is enhanced by high quality discussion forums or recently emerging educational Community Question Answering (CQA) systems. Nevertheless, only a small number of students answer questions asked by their peers. This results in instructor overload, and many unanswered questions. To increase s...
Conference Paper
In this paper, we describe a black-box sockpuppeting audit which we carried out to investigate the creation and bursting dynamics of misinformation filter bubbles on YouTube. Pre-programmed agents acting as YouTube users stimulated YouTube's recommender systems: they first watched a series of misinformation promoting videos (bubble creation) and th...
Preprint
False information has a significant negative influence on individuals as well as on the whole society. Especially in the current COVID-19 era, we witness an unprecedented growth of medical misinformation. To help tackle this problem with machine learning approaches, we are publishing a feature-rich dataset of approx. 317k medical news articles/blog...
Preprint
The negative effects of misinformation filter bubbles in adaptive systems have been known to researchers for some time. Several studies investigated, most prominently on YouTube, how fast a user can get into a misinformation filter bubble simply by selecting wrong choices from the items offered. Yet, no studies so far have investigated what it take...
Article
Purpose Partisan news media, which often publish extremely biased, one-sided or even false news, are gaining popularity world-wide and represent a major societal issue. Due to a growing number of such media, a need for automatic detection approaches is of high demand. Automatic detection relies on various indicators (e.g. content characteristics) t...
Article
Full-text available
Hate speech should be tackled and prosecuted based on how it is operationalized. However, the existing theoretical definitions of hate speech are not sufficiently fleshed out or easily operable. To overcome this inadequacy, and with the help of interdisciplinary experts, we propose an empirical definition of hate speech by providing a list of 10 ha...
Chapter
From a computer science perspective, addressing on-line hate speech is a challenging task that is attracting the attention of both industry (mainly social media platform owners) and academia. In this chapter, we provide an overview of state-of-the-art data-science approaches – how they define hate speech, which tasks they solve to mitigate the phen...
Preprint
Full-text available
From a computer science perspective, addressing on-line hate speech is a challenging task that is attracting the attention of both industry (mainly social media platform owners) and academia. In this chapter, we provide an overview of state-of-the-art data-science approaches - how they define hate speech, which tasks they solve to mitigate the phen...
Chapter
Massive spreading of medical misinformation on the Web has a significant impact on individuals and on society as a whole. The majority of existing tools and approaches for detection of false information rely on features describing content characteristics without verifying its truthfulness against knowledge bases. In addition, such approaches lack e...
Chapter
While digital space is a place where users communicate increasingly, the recent threat of COVID-19 infection even more emphasised the necessity of effective and well-organised online environment. Therefore, it is nowadays, more whenever in the past, important to deal with various unhealthy phenomena, that prohibit effective communication and knowle...
Data
This paper is an extended version of the conference paper presented at DIONE 2020, held online on 17, April 2020.
Chapter
The presence of external links or sources in the articles are considered as one of the indicators for assessing their quality by a librarian and information community. In this article, we explore linking patterns of the most popular traditional and “alternative” (partisan) digital news media in two V4 countries of Central Europe: Czech and Slovak R...
Chapter
This work deals with time-aware recommender systems in a domain of location-based social networks, such as Yelp or Foursquare. We propose a novel method to recommend Points of Interest (POIs) which considers their yearly seasonality and long-term trends. In contrast to the existing methods, we model these temporal aspects specifically for individua...
Article
In university courses as well as in MOOCs, Community Question Answering (CQA) systems have been recently recognized as a promising alternative to standard discussion forums for mediating online discussions. Despite emerging research on educational CQA systems, a study investigating when and how to use these systems to support university education i...
Conference Paper
Systems for Community Question Answering (CQA) are well-known on the open web (e.g. Stack Overflow or Quora). They have been recently adopted also for use in educational domain (mostly in MOOCs) to mediate communication between students and teachers. As students are only novices in topics they learn about, they may need various scaffoldings to achi...
Conference Paper
Full-text available
Successfulness of Community Question Answering (CQA) systems on the open web (e.g. Yahoo! Answers) motivated for their utilization in new contexts (e.g. education or enterprise) and environments (e.g. inside organizations). In spite of initial research how their specifics influence design of CQA systems, many additional problems have not been addre...
Conference Paper
Full-text available
Community Question Answering (CQA) systems (e.g. StackOverflow) have gained popularity in the last years. With the increasing community size and amount of user generated content, a task of expert identification arose. To tackle this problem, various reputation mechanisms exist, however, they estimate user reputation especially according to overall...
Conference Paper
Full-text available
Community Question Answering (CQA) systems, such as Yahoo! Answers and Stack Overflow, represent a well-known example of collective intelligence. The existing CQA systems, despite their overall successfulness and popularity, fail to answer a significant amount of questions in required time. One option for scaffolding collaboration in CQA systems is...
Conference Paper
Full-text available
Community Question Answering (CQA) is a well-known example of a knowledge management system for effective knowledge sharing in open online communities. In spite of the increasing research effort in recent years, the beneficial effects of CQA systems have not been fully discovered in organizational and educational environments yet. We present a nove...
Chapter
Full-text available
Web 2.0 has had a tremendous impact on education. It facilitates access and availability of learning content in variety of new formats, content creation, learning tailored to students’ individual preferences, and collaboration. The range of Web 2.0 tools and features is constantly evolving, with focus on users and ways that enable users to socializ...
Conference Paper
Full-text available
One of the approaches how to support collaboration during formal or informal learning is application of concepts which have been successfully veri-fied in different domains. Especially various web-based knowledge sharing ap-plications have been applied as a model for designing learning environments so far (e.g. social networking sites or forums). H...
Conference Paper
Full-text available
Nowadays, it is possible to access almost unlimited sources of infor-mation by ubiquitous information and communication technologies. However, sometimes it is difficult to find required information by standard web search engines. In these situations, Internet users have a possibility to ask their ques-tions in popular community question answering s...
Conference Paper
Full-text available
We propose a method for creating different types of study groups with aim to support effective collaboration during learning. We concentrate on the small groups which solve short-term well-defined problems. The method is able to apply many types of students' characteristics as inputs, e.g. interests, knowledge, but also their collaborative characte...
Conference Paper
Full-text available
In recent years we have witnessed expansion of Web 2.0. Its main feature is allowing users' collaboration in content creation using various means, e.g. annotations, discussions, wikis, blogs or tags. This approach has influenced also web-based learning, for which the term "Learning 2.0" has been introduced. In this paper we explore using tags in su...
Conference Paper
Full-text available
Current web is known as a space with constantly growing interactivity among its users. It is changing from the data storage into a social interaction place where people not only search interesting information, but also communicate and collaborate. Obviously, social networks are the most used places for common interaction among people. We present a...