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Opis: Fay, Hurlbert and Tennant recently introduced a one-player game on a finite connected graph G, which they called cup stacking. Stacks of cups are placed at the vertices of G, and are transferred between vertices via stacking moves, subject to certain constraints, with the goal of stacking all cups at a single target vertex. If this is possible for every target vertex of G, then G is called stackable. In this paper, we prove that if G admits a Hamilton path, then G is stackable, which confirms several of the conjectures raised by Fay, Hurlbert and Tennant. Furthermore, we prove stackability for certain powers of bipartite graphs, and we construct graphs of arbitrarily large minimum degree and connectivity that do not allow stacking onto any of their vertices.
Ključne besede: Games in graphs, Hamilton path, Cartesian product
Objavljeno v ReVIS: 02.07.2025; Ogledov: 55; Prenosov: 0
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Opis: One way to demonstrate the research focus and progress in a scientific field is through scientific publishing. Scientific articles are a starting point for analyzing the main topics, concerns, and author networks within a specific domain. This way, we can track the development of the discipline. Through publications, researchers create narratives that reveal the direction and development of specific disciplines. These narratives help form scientific paradigms. The main goal of this article is to detect and discuss the development of predominant scientific topics in particular period of Slovenian sociological science. The analysis starts with the emergence of the transition process from non-democratic Yugoslavia towards the independent Republic of Slovenia and onwards to contemporary times. We analyzed 774 scientific articles published between 1984 and 2022 in the journal Social Science Forum, which had an impact factor of 0.175 in 2022. The findings indicate that Slovenian sociologists’ research interests reflect historical transformations – from the transition to independence to EU accession. We use ontology-based analysis with OntoGen to track these thematic shifts systematically. This positions our work as a localized application of established text-mining approaches. The method applied allows us to uncover patterns of knowledge production tied to key sociopolitical moments in Slovenian history.
Ključne besede: Slovenian sociology, bibliographical data, OntoGen, concept, ontology creation
Objavljeno v ReVIS: 12.06.2025; Ogledov: 141; Prenosov: 5
Celotno besedilo (1,62 MB)
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Opis: We propose a formal model of a knowledge graph (abbr. KG) that classifies the ground triples into sets that correspond to the triple types. The triple types are partially ordered by the sub-type relation. Consequently, the sets of ground triples that are the interpretations of triple types are partially ordered by the subsumption relation. The types of triple patterns restrict the sets of ground triples, which need to be addressed in the evaluation of triple patterns, to the interpretation of the types of triple patterns. Therefore, a schema graph of a KG should include all triple types that are likely to be determined as the types of triple patterns. The stored schema graph consists of the selected triple types that are stored in a KG and the complete schema graph includes all valid triple types of KG. We propose choosing the schema graph, which consists of the triple types from a strip around the stored schema graph, i.e., the triple types from the stored schema graph and some adjacent levels of triple types with respect to the sub-type relation. Given a selected schema graph, the statistics are updated for each ground triple t from a KG. First, we determine the set of triple types stt from the schema graph that are affected by adding a triple t to an RDF store. Finally, the statistics of triple types from the set stt are updated.
Ključne besede: knowledge graphs, RDF stores, graph database systems
Objavljeno v ReVIS: 02.06.2025; Ogledov: 220; Prenosov: 2
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Opis: The European Union has been trying to adjust its tourism policy in response to the challenges posed by the recent COVID-19 pandemic. The funding of the EU Cohesion Policy has been one of the primary mechanisms guaranteeing that all regions can be prepared to receive tourists and cope with the sustainability challenges the pandemic has raised. The recovery and resilience plan (PRR) is the most recent instrument created to help economic growth in most European Union countries. The implementation of the PRR in Algarve and Alentejo has been fundamental to understanding the Portuguese tourism sector, as these regions are heavily dependent on tourism sector revenue and were hit hard by the consecutive lockdowns in recent years. Therefore, this policy, in brief, critically assesses the tourism-related projects that received funding from the PRR until November 2023 (ex ante) and their potential to guarantee long-term tourism sustainability in Algarve and Alentejo. Despite not achieving the expected efficiency results due to delays in project execution and low investment, the PRR is still a positive upgrade for tourism-related policy in Algarve and Alentejo.
Ključne besede: sustainable tourism, EU cohesion policy, recovery and resilience, Algarve, Alentejo
Objavljeno v ReVIS: 20.05.2025; Ogledov: 306; Prenosov: 2
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Opis: This article reviews the development and strengths of Industrial Symbiosis Networks (ISN) in Slovenia, which is crucial for transitioning to a Circular Economy (CE). Industrial Symbiosis (IS), as one of the tools for implementing a circular economy, promotes the collaborative use of resources, energy, and waste among industries, enhancing resource efficiency and reducing environmental impact. However, challenges such as inadequate regulatory support, underdeveloped markets for secondary raw materials, financial constraints, lack of awareness, and data-sharing issues hinder IS adoption. This article systematically reviews CE opportunities to enhance IS, including examples, digital platforms, eco-industrial parks, and government initiatives, using the PRISMA model (Preferred Items for Systematic Reviews and Meta-Analysis). By addressing these challenges and leveraging opportunities, Slovenia can further integrate IS into its industrial framework, advancing its CE goals. This analysis provides a foundation for future research and policy development in Slovenian Industrial Symbiosis.
Ključne besede: industrial symbiosis, networks, circular Economy, resource efficiency, Slovenia
Objavljeno v ReVIS: 19.05.2025; Ogledov: 403; Prenosov: 4
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