Trust management model that we present is adapted for ubiquitous devices cooperation, rather than for classic client-supplier relationship. We use fuzzy numbers to represent trust, to capture both the trust value and its uncertainty. The model contains the trust representation part, decisionmaking part and a learning part. In our representation, we define the trusted agents as a type-2 fuzzy set. In a decisionmaking part, we use the methods from the fuzzy rule computation and fuzzy control domain to take trusting decision. For trust learning, we use a strictly iterative approach, well adapted to constrained environments. We verify our model in a multi-agent simulation where the agents in the community learn to identify defecting members and progressively refuse to cooperate with them. Our simulation contains significant background noise to validate model robustness.

Předkládaný článek se zabývá tvorbou vhodného webového rozhraní pro vzdělávání osob s mentálním postižením pro práci v zahradnictví. Výzkum je založen na testování několika forem webové navigace skupinou mentálně postižených. Testování probíhalo po dobu sedmi týdnů v modelovém kurzu, který seznamoval účastníky s pracovními činnostmi v zahradnictví. Dílčím výzkumem bylo také identifikováno vhodné zařízení pro práci s webovou podobou modelového kurzu. Formulované výsledky byly na modelový kurz zpětně aplikovány a využity pro účely reálné podpory vzdělávání mentálně postižených pro práci v zahradnictví.

Nowadays simple usability is one of the key tasks of web portals, especially if these are main information portals of the government. The aim of this paper is to evaluate the usability of a web portal eAGRI (eagri.cz) in terms of unregistered users. This means in terms of general public in particular. The main purpose of the testing is to highlight the issues that users may encounter on this portal and determine the level of portal usability. Our usability testing was focused on a public part of the portal. The main idea of eAGRI portal is to create a central access point to information resources of the Ministry of Agriculture of the Czech Republic and its subordinate organizations. Qualitative research methods were applied. Specifically, we used Heuristic evaluation as a usability inspection method and three methods of usability testing: 5 second test, 30 second test and Formalized think-aloud test. KeywordsUsability analysis, eAGRI portal, heuristic evaluation, user testing, 5 second test, 30 second test.

Education of adults with intellectual disabilities in labor activities can help them to successfully and repeatedly carry out their work tasks and significantly help their self-realization. The problem is that the need for frequent repetition of already learned skills requires the constant presence of a teacher or caregiver since such a worker is not able to work independently. This situation increases the cost of employing people with disabilities. The aim is to find a way to reduce the necessary number of caregivers needed in this kind of activity and enable greater self-sufficiency of workers. The presented research intended to verify whether a web course could be an effective educational tool for people with intellectual disabilities. During the research, a group of ten participants with intellectual disabilities was educated to acquire basic skills in horticulture. The first teaching was realized through practical demonstrations at the workplace in the university production garden by professional gardeners. After these demonstrations skills of all participants were verified and so the basic level for further verification and comparison of knowledge was set. Subsequently, using three approaches of repeating the already learned practical curriculum (verbal repetition, no repetition, and repetition using the web course) and different time intervals, the level of knowledge of each participant was verified. Statistical methods were used to compare the results of different repetition approaches. Research results demonstrated that a web course, with specific content that consists of video or animation, combined with the use of pictograms for confident navigation, can be used by people with intellectual disabilities with good results. At the same time, in addition to practical teaching, this was the second best-rated approach of repeating knowledge. Using a web course, participants achieved similar work results as they did in practical teaching. Keywords: adult education, intellectual disabilities, professional education, web course.

Sentiment analysis is currently the most actively researched topic in the field of natural language processing, however, despite it being such a powerful tool, it is not very widely used in the agrarian sector. This research focuses on the discovery and analysis of scientific literature related to Sentiment analysis in agriculture, to provide an overview of how and where Sentiment analysis is used in the agrarian sector and which methods are most commonly used. This article also discusses which applications of Sentiment analysis yield the most benefits and suggests a direction for future research.