1. Centrality in connected graphs via convexity or concavityDinesh Pandey, Kamal Lochan Patra, 2026, original scientific article Abstract: In graph theory, several central parts of graphs have been defined. The center, median and the security center are three such concepts defined for any connected graph, while others are specific to trees. These definitions typically involve a function defined on the vertex set of the graph.
This paper generalizes the concepts of convex and concave functions, originally defined for trees, to connected graphs. Using this, we provide a unified approach to prove the known results that each of the center, median, and security center of a connected graph is either a cut vertex or lies within a block. Additionally, we introduce three new central parts of a connected graph as generalizations of the subtree core, core vertices, and characteristic set of a tree, and examine their properties in relation to the center, median, and security center. We also show that for any graph G, there exists a supergraph G' such that the subgraph induced by the characteristic center of G' is isomorphic to G. Finally, we propose several open problems related to subgraph core and core center.
Keywords: Center, characteristic center, convex and concave functions, core center, median, security center, subgraph core
Published in RUP: 17.08.2026; Views: 187; Downloads: 3
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2. AI Adoption in European EnterprisesMaja Ćukušić, 2015, published scientific conference contribution Abstract: This paper examines the data on AI adoption in European companies by analysing how different indicators of digital readiness, technological infrastructure and organisational capacity contribute to the successful integration of AI. The study analyses data from 31 European countries and uses fuzzy-set Qualitative Comparative Analysis (fsQCA) to identify three different pathways to AI adoption: digital maturity (a combination of high digital intensity, internet access and ICT security), technology-based readiness (based on in-house data analytics, cloud computing and ICT specialists) and capability-based empowerment (through ICT training alongside ICT staff and ICT security). The results show that multiple configurations can lead to effective AI adoption, underlining the principle of equivalence. The findings underscore the important role of ICT security across all pathways and suggest that workforce development is able to compensate for infrastructural gaps. Some practical guidance for businesses and policy makers are also provided.
Keywords: AI adoption, digital transformation, fsQCA, ICT security, data analytics, cloud computing, ICT skills training, European enterprises
Published in RUP: 04.03.2026; Views: 543; Downloads: 5
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5. Decentralized data management privacy-aware framework for positive energy districtsSidra Aslam, Viktor Bukovszki, Michael Nicolas Mrissa, 2021, original scientific article Keywords: positive energy districts, access control, security, energy transition, decentralized framework, blockchain, security, privacy
Published in RUP: 29.10.2021; Views: 4057; Downloads: 47
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9. Facing the new challengeTea Ward, 2005, undergraduate thesis Keywords: entrepreneurship, eco-efficiency, sustainable development, triple bottom line, ISO 14001, economic view, Kyoto protocol, staff, job security, diplomska dela
Published in RUP: 15.10.2013; Views: 5074; Downloads: 210
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