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Trust and Reputation in Distributed Systems
Samek, Jan ; Návrat,, Pavol (referee) ; Šafařík,, Jiří (referee) ; Hanáček, Petr (advisor)
This Ph.D. thesis deals with trust modelling for distributed systems especially to multi-context trust modelling for multi-agent distributed systems. There exists many trust and reputation models but most of them do not dealt with the multi-context property of trust or reputation. Therefore, the main focus of this thesis is on analysis of multi-context trust based models and provides main assumptions for new fully multi-contextual trust model on the bases of them. The main part of this thesis is in providing new formal multi-context trust model which are able to build, update and maintain trust value for different aspects (contexts) of the single entity in the multi-agent system. In our proposal, trust value can be built on the bases of direct interactions or on the bases on recommendations and reputation. Moreover we assume that some context of one agent is not fully independent and on the bases of trust about one of them we are able to infer trust to another's. Main contribution of this new model is increasing the efficiency in agent decision making in terms of optimal partner selection for interactions. Proposed model was verified by implementing prototype of multi-agent system when trust was used for agents' decision making and acting.
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Multi-Context Reputation System for WWW
Kadlec, Petr ; Zbořil, František (referee) ; Samek, Jan (advisor)
This Diploma Thesis introduces the basic concepts of reputation and trust, reputation systems and problems of multi-contextual models of reputation. It also describes practical aspects of multi-contextual models in web environment. Described contextual models are then used for design and implementation of real web application.
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Multiple-Context Trust Model for a Social Network Using Personality Analysis
Švec, Tomáš ; Zbořil, František (referee) ; Samek, Jan (advisor)
Tato diplomová práce navazuje na bakalářskou práci, ve které byl vytvořen model důvěry pro sociální síť Facebook. Do tohoto modelu jsou zapracovány připomínky z konference UMAP 2013 a ověřena jeho škálovatelnost a flexibilita. V další části práce jsou uvedeny základní termíny z psychologie osobnosti a zkoumána závislost důvěry na osobnosti uživatele. Je vybrán model Big Five k reprezentaci charakteru uživatele a navržen dotazník, u nějž bude zkoumána korelace s modelem důvěry. Tato korelace je na základě sociologických poznatků odhadnuta a později ověřena na reálných uživatelích sociální sítě Facebook.
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When the family is not around
Kantor, Táňa ; Suchánek, Radek (referee) ; Mléčka, Jan (advisor)
The aim of this work is to introduce a new concept of children's home which seeks to find a relationship between family environment, specific needs of children or necessary architecture requirements which are important in perceiving the space in which children are.
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Adventure Game with Intelligent Cooperating Actors
Vacek, Lukáš ; Samek, Jan (referee) ; Zbořil, František (advisor)
The goal of this master's thesis is to design and implement framework that can be used for development of agent systems. Framework is implemented in Java and encapsulates JADE library. Framework is used for implementation of adventure game. There are several characters (agents) with specific roles who cooperate and try to achieve their goals.
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Trust and Reputation in Distributed Systems
Malačka, Ondřej ; Samek, Jan (referee) ; Zbořil, František (advisor)
The goal of this master's thesis is to design and implement agent system for dealing with sportsmen. It will be possible to apply trust and reputation principles on this system. This system is implemented in Jason agent language. Agents there posing as sports club managers. The main target of these managers is to have the maximal profit. The environment of agents is changing by playing the matches between the teams. Players quality evalution follows the played matches. Based on played matches, managers can evaluate the worth of each player and trade them in order to achieve the maximal possible profit. Untrustworthy agents take a place in this system. These agents overvalue their players using inccorect behavior. The experiments will be made within this masters's thesis in order to compare gain of apllication trust and reputation principles.
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Evaluation of Trust or Reputation Based on Social Network Analysis
Švec, Tomáš ; Malačka, Ondřej (referee) ; Samek, Jan (advisor)
This thesis' goal is to apply the terms trust and reputation from the point of view of artificial intelligence to social network analysis methods. It evaluates current available interactions for a model of trust considering various social networks. A mathematical model of trust for Facebook is designed and described in further parts. This model had been implemented in Python programming language. Experiments regarding this thesis are conducted on a sample amount of Facebook users and furthermore analyzed from the perspective of both artificial intelligence and social psychology.
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Trust in media: an analysis of the determinants of perceived media credibility
Smetanová, Kateřina ; Jirák, Jan (advisor) ; Cebe, Jan (referee)
This diploma thesis "Důvěra v média: analýza determinantů vnímané důvěryhodnosti médií" deals with the issue of trust in the media among the population aged 20-30. This age group is defined based on developmental psychology as young or early adulthood. The diploma thesis asks how members of the selected target group trust the given media and what this perceived trustworthiness is conditioned by. The diploma thesis is divided into a theoretical and an analytical part. In its introduction, the theoretical part deals with the central topic of this diploma thesis, which is trust in the media. There is also focus on a interdisciplinary links (trust studies), approaches to research on trust in the media, characteristics and results of trust research in the Czech Republic. It also deals with the definition of the concept of trust, its functions in society and its concept in various fields such as sociology, political science, psychology and anthropology. At the end, the theoretical part offers the necessary anchoring of the topic from the point of view of media theory by means of the definition of the function and effects of the media on society and the dual broadcasting system. The analytical part first describes the research methodology, then offers the interpretation of the results of the...
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Climate change deniers and believers on the TikTok media platform: similarity and difference in the distribution of their knowledge claims
Kasenov, Ayken ; Balon, Jan (advisor) ; Coufal, Linda (referee)
In the era of the dominance of social networks, not only communication but also conflicts have undergone significant changes. Polarization and radicalization that occur due to the isolation of groups in their informational echo chambers cause radicalization of ideas. The ideas of existence of the climate change have split the users of TikTok into two opposing categories. This study aims to understand what are the similarities and differences in how users of the social network TikTok perceived the differences inside and outside an algorithm-based social network. To answer this question, a comparison of the interview data of 5 climate change believers and 5 deniers was made. The results of the research suggest that echo chambers do not prevent the creation of an opinion-challenging environment for both groups. However, the groups have perceived their informational environment differently, with climate change believers noticing more frequent exposure to opposing information.
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The Role of Trust in Media in Resilience: The Cases of the Czech and Slovak Republic
Doubravová, Barbora ; Bahenský, Vojtěch (advisor) ; Földes, Kristián (referee)
The marter thesis deals with the role of trust in media in resilience. The aim of the thesis is to explore the approach to trust in media by the state and journalists as a factor in countering the issue of disinformation, with potentially co-explanatory differences between the Czech Republic and the Slovak Republic in their societal resilience. The thesis utilizes exploratory research of a qualitative nature. The results are primarily extracted through 15 interviews with journalists and national officials, as well as experts from both countries. As the results illustrate, the state and media sector in both countries consider trust in the media as a crucial factor in resilience against disinformation and countering disinformation. Journalists' perspectives on the subject are similar in both countries, while the approaches of national officials are to a certain extent differen. In the Czech Republic, national officials express a stronger criticism regarding the quality of media on the national level, at the same time, a passive approach to building their trust. On the other hand, national officials in Slovakia depict a greater eagerness to contribute to trust in media. However, it is often diminished by a lack of resources or political will. The results outline the necessity of a comprehensive...
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