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1.
Time delays shape the eco‑evolutionary dynamics of cooperation
Sourav Roy, Sayantan Nag Chowdhury, Srilena Kundu, Gourab Kumar Sar, Jeet Banerjee, Biswambhar Rakshit, Prakash Chandra Mali, Matjaž Perc, Dibakar Ghosh, 2023, original scientific article

Abstract: We study the intricate interplay between ecological and evolutionary processes through the lens of the prisoner’s dilemma game. But while previous studies on cooperation amongst selfsh individuals often assume instantaneous interactions, we take into consideration delays to investigate how these might afect the causes underlying prosocial behavior. Through analytical calculations and numerical simulations, we demonstrate that delays can lead to oscillations, and by incorporating also the ecological variable of altruistic free space and the evolutionary strategy of punishment, we explore how these factors impact population and community dynamics. Depending on the parameter values and the initial fraction of each strategy, the studied eco-evolutionary model can mimic a cyclic dominance system and even exhibit chaotic behavior, thereby highlighting the importance of complex dynamics for the efective management and conservation of ecological communities. Our research thus contributes to the broader understanding of group decision-making and the emergence of moral behavior in multidimensional social systems.
Keywords: cooperation, time delay, evolutionary dynamics, social dilemma, social physics
Published in DKUM: 04.04.2024; Views: 39; Downloads: 0
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2.
A conceptual model for a circular city : a case study of Maribor, Slovenia
Kristijan Brglez, Matjaž Perc, Rebeka Kovačič Lukman, 2024, original scientific article

Abstract: Cities play a crucial role in achieving sustainable development. Decision-makers require assistance in developing city transformation plans amidst the emergence of various city models. A content analysis using concept mapping was conducted to examine smart, circular, and green city models. The analysis, supported by Leximancer, revealed that city models are evolving by adopting benefcial solutions from competitors, refecting a strong focus on sustainable development. Additionally, twentyfour research areas essential for implementing a circular city were identifed and validated. Furthermore, a conceptual model for a circular city was developed, incorporating the Defne-Measure-Analyse-Improve-Control tool and a problem-solving system. Testing the model on Maribor highlighted challenges in monitoring the transition towards circularity. The study validates the established model but emphasises the need for further research and case studies to verify its practicality. This scientifc research enhances the understanding of city models and their evolution towards sustainability, providing valuable insights for decision-makers and urban planners.
Keywords: city models, conceptual model, content analysis, problem-solving structure
Published in DKUM: 29.03.2024; Views: 45; Downloads: 2
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3.
The complexity and interconnectedness of circular cities and the circular economy for sustainability
Kristijan Brglez, Matjaž Perc, Rebeka Kovačič Lukman, 2023, original scientific article

Abstract: In our study, we are evaluating the dynamic interplay between circular cities and the circular economy, revealing connections shaped by new research insights, using Web of Science database. We have in depth analysed 671 publications from 1990 to mid- 2023, employing Leximancer and VOSviewer tools. Our analysis uncovered key themes, including buildings, waste management, value chains, and sustainable development, linking the circular cities concept and circular economy framework. Emerging research trends, such as urban metabolism, urban mining, governance models, the built environment, sustainability benchmarks, and value chain management, signify deliberate shifts towards higher circular development and implementation. These trajectories harmonise with overarching sustainable development goals. Contemporary research emphasises urban mining, circular indicators, adaptive resource reuse, and urban structure regeneration. This focus facilitates transitioning from linear models to heightened circularity within urban contexts. Research inclination is shifting from traditional economic and environmental concerns towards holistic urban configurations that prioritise social integration, communal well-being, and the dynamics of the social economy. Through this analytical expedition, we offer novel insights that enhance our understanding of the intricate symbiosis between circular cities and the circular economy. Our findings provide a scientific foundation for formulating targeted strategies by decision-makers and guiding urban landscapes towards transformative trajectories aligned with sustainable development objectives and sustainable cities.
Keywords: bibliometric analysis, circular city, circular economy, content analysis, Leximancer, sustainability, sustainable development goals
Published in DKUM: 29.03.2024; Views: 37; Downloads: 2
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4.
Age and market capitalization drive large price variations of cryptocurrencies
Arthur A. B. Pessa, Matjaž Perc, Haroldo V. Ribeiro, 2023, original scientific article

Abstract: Cryptocurrencies are considered the latest innovation in finance with considerable impact across social, technological, and economic dimensions. This new class of financial assets has also motivated a myriad of scientific investigations focused on understanding their statistical properties, such as the distribution of price returns. However, research so far has only considered Bitcoin or at most a few cryptocurrencies, whilst ignoring that price returns might depend on cryptocurrency age or be influenced by market capitalization. Here, we therefore present a comprehensive investigation of large price variations for more than seven thousand digital currencies and explore whether price returns change with the coming-of-age and growth of the cryptocurrency market. We find that tail distributions of price returns follow power-law functions over the entire history of the considered cryptocurrency portfolio, with typical exponents implying the absence of characteristic scales for price variations in about half of them. Moreover, these tail distributions are asymmetric as positive returns more often display smaller exponents, indicating that large positive price variations are more likely than negative ones. Our results further reveal that changes in the tail exponents are very often simultaneously related to cryptocurrency age and market capitalization or only to age, with only a minority of cryptoassets being affected just by market capitalization or neither of the two quantities. Lastly, we find that the trends in power-law exponents usually point to mixed directions, and that large price variations are likely to become less frequent only in about 28% of the cryptocurrencies as they age and grow in market capitalization.
Keywords: cryptocurrency, price variation, market value, econophysics
Published in DKUM: 25.03.2024; Views: 79; Downloads: 7
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5.
Analiza hidroloških zahtev za načrtovanje novega sistema odvajanja meteornih voda v Brežicah : magistrsko delo
Luka Papa, 2023, master's thesis

Abstract: V magistrskem delu je obravnavano področje odvodnjavanja urbanih površin, hidrotehnike in hidravlike. Obravnavan je aktualni problem preobremenjenosti mešanih odpadnih komunalnih sistemov in posledično čistilnih naprav, in sicer s pomočjo realnega primera izdelane dokumentacije idejne zasnove za pridobitev projektnih in drugih pogojev (IZP) pri podjetju PROINFRA, d. o. o., številka projekta 193: »Odvajanje meteornih voda za širše območje ob Cesti svobode«. Magistrsko delo zajema teoretične osnove in tehnične usmeritve različnih standardov in programske opreme za konkretni primer. Uporabljeni so bili nemški standardi DWA za inženirske objekte (cevovodi, razbremenilniki in zadrževalniki) in programsko orodje Urbano Canalis 11.
Keywords: gradbeništvo, nizke gradnje, hidrotehnika, dimenzioniranje meteorne kanalizacije
Published in DKUM: 19.12.2023; Views: 249; Downloads: 31
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Analiza primernosti dehidracije blata na ČN Celje : magistrsko delo
Rok Stojnšek, 2023, master's thesis

Abstract: Zadnja leta se v Sloveniji ter tudi na ČN Celje srečujemo s problemom končne dispozicije blata. Količina blata, s katero se srečujemo na ČN Celje na letni ravni je 6000 ton, Toplarna Celje pa lahko za sežig sprejme zgolj 4000 ton. V magistrski nalogi bomo najprej ovrednotili vse stroške, ki nastanejo pri trenutni obdelavi odpadnega blata. Preučili bomo različne možnosti uporabe blata. Blato nastaja dnevno in ga je potrebno dnevno odstranjevati iz sistema, zato se je pripravila analiza primernosti dehidracije. Ena izmed rešitev problematike odstranjevanja blata iz ČN Celje je, da se osredotočimo na ustrezno dehidracijo blata, druga pa, da dehidrirano blato dodatno sušimo in posledično zmanjšamo volumen ter težo. Pri obeh postopkih je treba upoštevati stroške v vseh fazah dehidracije, poleg stroškov investicije tudi stroške porabe energije in polimera, ter stroške odvoza ter sosežiga.
Keywords: gradbeništvo, odpadno blato, čistilna naprava, odpadne vode, komunala, centrifuga, stiskalna preša, sušenje blata, stroškovna analiza
Published in DKUM: 27.10.2023; Views: 268; Downloads: 26
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8.
The benefits, costs and feasibility of a low incidence COVID-19 strategy
Thomas Czypionka, Emil Nafis Iftekhar, Barbara Prainsack, Viola Priesemann, Simon Bauer, André Calero Valdez, Sarah Cuschieri, Enrico Glaab, Eva Grill, Jenny Krutzinna, Christos Lionis, Helena Machado, Carlos Martins, George N Pavlakis, Matjaž Perc, Elena Petelos, Martyn Pickersgill, Alexander Skupin, Eva S. Schernhammer, Ewa Szczurek, Sotirios Tsiodras, Peter Willeit, Paul Wilmes, 2022, original scientific article

Abstract: In the summer of 2021, European governments removed most NPIs after experiencing prolonged second and third waves of the COVID-19 pandemic. Most countries failed to achieve immunization rates high enough to avoid resurgence of the virus. Public health strategies for autumn and winter 2021 have ranged from countries aiming at low incidence by re-introducing NPIs to accepting high incidence levels. However, such high incidence strategies almost certainly lead to the very consequences that they seek to avoid: restrictions that harm people and economies. At high incidence, the important pandemic containment measure ‘test-trace-isolate-support’ becomes inefficient. At that point, the spread of SARS-CoV-2 and its numerous harmful consequences can likely only be controlled through restrictions. We argue that all European countries need to pursue a low incidence strategy in a coordinated manner. Such an endeavour can only be successful if it is built on open communication and trust.
Keywords: disease dynamics, exponential growth, virality, strategy
Published in DKUM: 25.09.2023; Views: 438; Downloads: 32
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9.
Advances in monitoring and understanding the dynamics of suspended-sediment transport in the river Drava, Slovenia: an analysis more than a decade-long
Janja Kramer Stajnko, Renata Jecl, Matjaž P. Nekrep, 2023, original scientific article

Abstract: Managing sediment transport in streams is crucial to the surface water resource development strategy and has several implications for flood risk and water management, hydropower use, and balancing river morphology. This paper summarises the movement and behaviour of suspended sediment within the Slovenian portion of the River Drava, covering a span of thirteen years from 2005 to 2018. An analysis of relevant data collected during this period is also presented. Suspended-sediment dynamics strongly depend on flow velocity, seasonal variations in sediment sources, and human interventions in the riverbed. The transportation of material in the River Drava results in the accumulation of sediments in reservoirs and riverbeds, consequently impeding the natural hydrological cycle by reducing the outflow into aquifers. The 2018 high-water event is analysed in terms of the dependence of concentration of suspended sediments on discharge, where counterclockwise hysteresis was observed, providing an essential clue to the origin of sediment. Sediments from the River Drava in Slovenia are managed with some conventional processes and are mainly deposited or reintegrated into rivers and aquatic ecosystems. Some additional sediment management strategies with long-term solutions for efficient and comprehensive water management, hydropower, and ecological problems are proposed.
Keywords: sediment transport, streams, suspended sediment dynamics, suspended sediment transport, river Drava, sediment management, monitoring, water management
Published in DKUM: 13.09.2023; Views: 342; Downloads: 21
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10.
Sustainability in tourism determined by an asymmetric game with mobility
Manuel Chica, Juan M. Hernández, Matjaž Perc, 2022, original scientific article

Abstract: Many countries worldwide rely on tourism for their economic well-being and development. But with issues such as over-tourism and environmental degradation looming large, there is a pressing need to determine a way forward in a sustainable and mutually rewarding manner. With this motivation, we here propose an asymmetric evolutionary game with mobility where local stakeholders and tourists can either cooperate or defect in a spatially structured setting. Our study reflects that sustainable tourism is primarily determined by an optimal trade-off between economic benefits of the stakeholders and their costs related to the application of sustainability policies. In contrast, the specific benefits and costs of the tourists are comparatively less relevant. The reader can also observe that allowing for greater tourist mobility decreases cooperation and leads to faster polarization among local stakeholders. In agreement with observations worldwide, we identify decreasing population densities in tourist areas in terms of both, stakeholders and tourists, to be a key aid to greater cooperation and overall sustainability of tourism. These results are rooted in spatial formations and complex alliances that manifest spontaneously through the evolutionary dynamics in a structured population.
Keywords: asymmetric game, spatial structure, migration, evolutionary game theory, sustainable tourism, over-tourism
Published in DKUM: 24.08.2023; Views: 418; Downloads: 21
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