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1.
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: 59; Downloads: 2
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2.
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: 51; Downloads: 2
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3.
Energy indicators and topics in food supply chains' life cycle assessment
Petra Vidergar, Rebeka Kovačič Lukman, 2019, original scientific article

Abstract: Food supply chains have a significant impact on the environment, using large amounts of fossil energy resources and other non-renewable resources. Energy is directly and indirectly needed in all the steps along the food supply chain. This paper explores energy-related indicators in food supply chains and life cycle assessment within sixty-six research papers, gathered from the Web of Science database. Furthermore, a quantitative content analysis was carried out to assess the research trends and future opportunities regarding energy-related topics. The results revealed that a holistic perspective is needed, as energy-related indicators should be included in the use and end-of-life stages, not only in the production processes, and that the inclusion should follow the life cycle assessment methodology. The current research topics are energy issues related to production processes and environmental impacts. Improvements are possible in extending research areas to renewable resources, whole lifecycle perspectives, and socio-economic consequences.
Keywords: energy, food supply chain, life cycle assessment, Leximancer
Published in DKUM: 05.12.2023; Views: 227; Downloads: 4
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4.
Celostno vrednotenje življenjskega cikla plastičnih tokov v Sloveniji z vidika vplivov na okolje : magistrsko delo
Asja Frangež, 2023, master's thesis

Abstract: Močna porast proizvodnje različnih izdelkov na osnovi različnih plastičnih materialov povečuje tudi nastajanje plastičnih odpadkov, kar ustvarja nove izzive, saj se različni plastični materiali različno reciklirajo oz. zaključujejo svoj življenjski cikel. Kljub temu, da Slovenija že dosega cilj 55 % recikliranja plastične embalaže do leta 2030, pa za oceno vplivov plastike na okolje skozi njen celotni življenjski cikel v Sloveniji še ni bilo opravljene raziskave. Analiza materialnega toka plastike v Sloveniji zajema zadnje statistično leto, tj. 2021. Študija magistrske naloge predstavlja LCA analizo (Analizo življenjskega cikla (angl. Life Cycle Assessment) plastičnih tokov, ki obsegajo 8 vrst plastičnih polimerjev (LDPE, HDPE, PVC, PET, PUR, PP, PS in ostala plastika) ter vse faze življenjskega cikla z različnimi scenariji v končni fazi. Analiza je bila izvedena z uporabo programskega orodja Open LCA in ReCiPe 2016 metodo ocenjevanja vpliva življenjskega cikla. Glavni dejavniki, ki prispevajo k okoljskim obremenitvam, so bili identificirani skozi vse faze življenjskega cikla. Izkazalo se je, da ima največji vpliv na okolje pri vseh osmih proučevanih plastikah faza proizvodnje, vodilna pri vplivih na okolje je ostala plastika (ki je je tudi količinsko največ), sledi ji HD-PE. Najmanj okoljskih vplivov se pojavlja pri plastikah PVC in LDPE. Vseh 8 plastik pa dosega največje vplive na okolje v kategoriji globalnega segrevanja. Po primerjavi z različnima končnima scenarijema (100 % sežig in 100 % reciklaža) ugotovimo, da je najmanj sporen za okolje scenarij 100 % reciklaže, saj ima zaradi povratne zanke najmanjši vpliv na okolje.
Keywords: analiza življenjskega cikla, plastični polimeri, okoljski vplivi, ReCiPe metoda, trajnostno ravnanje
Published in DKUM: 01.09.2023; Views: 421; Downloads: 0
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5.
Transformation of the RESPO decision support system to higher education for monitoring sustainability-related competencies
Andreja Abina, Bojan Cestnik, Rebeka Kovačič Lukman, Sara Zavernik, Matevž Ogrinc, Aleksander Zidanšek, 2023, original scientific article

Abstract: A result-oriented engagement system for performance optimisation (RESPO) has been developed to systematically monitor and improve the competencies of individuals in business, lifelong learning and secondary schools. The RESPO expert system was transferred for use in higher education institutions (HEIs) based on successful practical application trials. The architecture and functionality of the original RESPO expert system have been transformed into a new format that will collect information on the required competencies and the available educational programmes to help students effectively develop competencies through formal and non-formal education. First, the initial version of the RESPO system and its functionality were tested on a selected group of students and higher education staff to validate and improve its effectiveness for the needs of HEIs. This paper summarises the key findings and recommendations of the validators for transforming the RESPO application into an application for HEIs. In addition, the selection of competencies in the RESPO application database has been adapted to align with selected study programmes and the need to develop sustainability-related competencies. These findings can support professionals working in higher education institutions in developing students’ future competencies and fostering the targeted use of learning analytics tools.
Keywords: higher education, competencies development, decision support, STEM education, sustainability
Published in DKUM: 02.08.2023; Views: 233; Downloads: 15
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6.
Decision support concept for improvement of sustainability-related competences
Andreja Abina, Tanja Batkovič, Bojan Cestnik, Adem Kikaj, Rebeka Kovačič Lukman, Maja Kurbus, Aleksander Zidanšek, 2022, original scientific article

Abstract: In this paper, we derived competences from previously developed competence models, ensuring the effective use of advanced technologies in future factories to improve the sustainability of their business models and strategies. Based on the analysis of the Hogan competence model and competence models for sustainability and leadership, we compiled a selection of competences for digitalisation, automation, robotics, artificial intelligence, and soft competences such as emotional intelligence and cultural literacy. We also included competences required for sustainability, corporate social responsibility, and circular economy. The selected competences formed the core for the conceptual development of a decision support tool for the individualised selection of training for employees. The concept was tested in customised training to improve employees’ skills and motivation for lifelong learning at the selected industrial partner. The developed assessment algorithm was used to monitor the progress of individual employees’ skills development before and after their training participation. The results of the assessment help human resource departments make decisions for selecting the most effective and optimal training for employees to improve their sustainability-related competences. Such a systematic approach can improve and evaluate competences that companies need to transition to a circular economy.
Keywords: circular economy, sustainability, competence development, employee training plan, decision support
Published in DKUM: 26.07.2023; Views: 334; Downloads: 34
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7.
Celostno vrednotenje življenjskega cikla embalaže za paradižnik iz vidika vplivov na okolje : diplomsko delo univerzitetnega študijskega programa
Nika Purešević, 2022, undergraduate thesis

Abstract: Ta naloga predstavlja celovito oceno življenjskega cikla embalaže za paradižnik iz vidika vplivov na okolje. V nalogi so analizirane štiri različne plastične embalaže za paradižnik – polipropilenska folija, polipropilenska vrečka kombinirana s kartonsko škatlo iz valovitega recikliranega papirja, navadna plastična vrečka iz polietilena nizke gostote in škatla iz recikliranega polietilena tereftalata. Analizo vrednotenja življenjskega cikla smo izvedli z uporabo programskega orodja Open LCA in CML Centrum voor Milieukunde Leiden, metodo za vrednotenje vplivov. Rezultati so pokazali, da imata procesa proizvodnje plastične embalaže in kartonske škatle največji vpliv na okolje. Gledano skozi celoten življenjski cikel, predstavlja R PET škatla najslabšo možnost za izbiro embalaže, saj ima vpliv na večino okoljskih kazalcev izrazitejši, v primerjavi z drugimi embalažami. LDPE in PP vrečka nista tako sporni za okolje, kot pa R PET škatla ali celo sestavljena embalaža iz PP folije in kartonske škatle. Vse embalaže pa dosegajo največje vplive na okolje v kategoriji globalnega segrevanja ozračja.
Keywords: življenjski cikel, plastična embalaža, polipropilen, reciklirani polietilen tereftalat, polietilen nizke gostote, vpliv na okolje
Published in DKUM: 16.01.2023; Views: 507; Downloads: 51
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8.
Sustainable development in transport and logistics
Vasja Omahne, 2021, master's thesis

Abstract: The support for an ongoing global pursuit of sustainable development, consumer awareness about sustainability, and regulations have affected the transport and logistics sector due to the fact that it presents ample environmental, social and economic challenges. The transport sector contributes globally to about 14% of greenhouse gas emissions, and around one third of the European Union's emissions, yet also represents an important economic sector, employing around 10 million individuals, thus requiring an in-depth discussion, especially regarding environmental impact. Due to increasing global concern for the environment, companies and policymakers are facing pressure to reduce the environmental impact related to transport and logistics activities and make them more sustainable. Before choosing a best practice for improvement, especially regarding the environmental perspective, a thorough analysis regarding the environmental impact has to be carried out based on reliable data and methodology. For such purposes, the life cycle assessment (LCA) defined by standards ISO 14040 and 14044 is commonly used. While the LCA focuses only on the environmental perspective, sustainability is represented by three dimensions, which are environmental, economic and social and those are interlinked, which presents a challenge, as each dimension has a major impact on every stage of the life cycle of a product, process or service. Thus there is a need to evaluate all three perspectives of sustainability in order to make transport and logistics processes more sustainable. Another option to make transport and logistics processes more sustainable and to achieve sustainable development is through education. Thus, it is important to integrate sustainability-oriented topics in logistics programs and courses, and consequently educate future logisticians about sustainability. Considering environmental burdens and sustainable development in transport and logistics, we explored LCA regarding its use in transport and logistics and studied the integration of sustainability into logistics education in EU, as it is important to educate future logistics managers and decision makers to gain sufficient knowledge on the importance of sustainability. Also, as logistics processes pose several environmental challenges and impacts, social and economic impacts are the ones that are frequently overlooked. Thus we additionally focused on performing an applicable comprehensive sustainability evaluation of a monkey toy and evaluated its environmental (through LCA), social (through SLCA) and economic (through LCC) impacts through the life cycle. At the same time, we explored options to enhance the present CE concept in the monkey toy company. Exploring the use of LCA in transport and logistics, we focused on the state-of-the-art of transport-related life cycle assessment studies, as they are important for the decision-making processes. Our research of LCA & transport studies was framed around the requirements of the International Organization for Standardization. A specific focus was given to the quality of life cycle assessment phases, comprehending goal and scope, inventory, life cycle impact assessment, and interpretation. Thirty-four research and review papers were studied, sourced from the Web of Science database. Studying the monkey toy, we firstly assessed the environmental impacts of the toy through LCA and additionally combined it with SLCA and LCC to evaluate the toy's sustainability comprehensively. Based on the results of the sustainability evaluation, we gained an insight into environmental, economic and social hotspots that the monkey represents. We then presented a possible enhancement of the CE concept. Lastly, focusing on logistics education, we analyzed and elaborated upon an integration of sustainability topics at higher education programs in logistics and their curricula for bachelor and master degrees at universities across Europe.
Keywords: logistics, transport, sustainability, life-cycle assessment, logistics education
Published in DKUM: 26.03.2021; Views: 1481; Downloads: 55
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9.
Celostno vrednotenje življenjskega cikla prehrambenih oskrbovalnih verig
Petra Vidergar, 2020, master's thesis/paper

Abstract: Oskrba s hrano je eno izmed najbolj zapletenih logističnih področij v zadnjih desetletjih glede na neprestano rast potrošnje prehrambenih izdelkov, predvsem v hitro razvijajočih se državah. Oskrbne verige hrane postajajo vse bolj globalne in prepletene znotraj široke mreže pridelovalcev, distributerjev, logističnih centrov, trgovin in potrošnikov. Kompleksnost na področju prehrambne industrije prinaša odgovorno spremljanje sledljivosti blaga, preverjanja kakovosti, ustreznosti in časovne zadostnosti z ozirom na zadovoljitev potreb vse zahtevnejših potrošnikov. Z večanjem proizvodnih kapacitet in zadovoljitvijo potreb po hrani globalnega prebivalstva je neizogibna posledica onesnaževanje okolja z različnimi izpusti in odpadnimi snovmi. Za bolj celovito razumevanje oskrbovalnih verig hrane, njihovih vlog in potencialov izboljšav moramo sisteme proučiti na zelo podroben, sistemski in strukturiran način, ki presega le opis materialnih tokov, porabljeno energijo, transportne poti in časovne omejitve. V zadnjih letih se povečuje zanimanje za vrednotenje oskrbnih verig predvsem z vidika emisij v zrak (npr. CO2) in uvajanja trajnostne embalaže ter skrbnega ravnanja z odpadki. Poudarek je tudi na spodbujanju potrošnikov k nakupu okolju prijaznih gospodinjskih aparatov in drugih naprav. Redko pa najdemo raziskave, ki vključujejo celovito vrednotenje oskrbne verige od samega začetka pridobivanja materialov, skozi transport do proizvodnega obrata, proizvodne procese, transport do distribucijske mreže, potrošnika in, ne nazadnje, skozi fazo uporabe izdelka v času njegove življenjske dobe, vse do zadnje faze, ko izdelek izgubi svojo prvotno funkcijo in postane odpadek in lahko tudi vir za nadaljnjo uporabo. Pri pregledu literature na področju trajnostne oskrbe s hrano lahko v zadnjih letih zasledimo novejšo metodo celostnega vrednotenja okoljskih vplivov oskrbovalnih verig, imenovano Life Cycle Assessment, ali vrednotenje življenjskega cikla (v nadaljevanju LCA). Metoda temelji na ISO (Mednarodna organizacija za standardizacijo) standardih 14040 in 14044 ter je ena izmed najbolj celovitih in znanstveno ter metodološko podprtih postopkov za vrednotenje vplivov na okolje v celotnem življenjskem ciklu izdelka, procesa ali storitve.
Keywords: Oskrbne verige hrane, Analiza življenjskega cikla, Krožno gospodarstvo, Trajnostna logistika, Vpliv na okolje.
Published in DKUM: 13.03.2020; Views: 1578; Downloads: 34
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10.
Izvajanje krožnega gospodarstva v državah članicah eu-13
Samo Kumperščak, 2018, bachelor thesis/paper

Abstract: V diplomskem delu smo raziskali področje krožnega gospodarstva ter izvajanje le-tega znotraj držav EU-13. Z izvajanjem krožnega gospodarstva bi države postale bolj konkurenčne ter bi imele manjši, negativen vpliv na okolje. Cilji diplomskega dela so ugotovitev prisotnosti izvajanja krožnega gospodarstva v državah članicah EU-13, predvsem na osnovi strateških in političnih usmeritev, ki so bile spodbujene s strani Evropske komisije in parlamenta, preučevanje priložnosti, izzivov in ovir izvajanja načel krožnega gospodarstva ter predstavitev konkretnih predlogov za boljše vključevanje krožnega gospodarstva v državah EU-13. S pomočjo različnih virov smo razdelali pojem krožnega gospodarstva ter pripomogli k boljšemu razumevanju le-tega. Vključevanje krožnega gospodarstva v politične strategije je pomembno za nadaljnji razvoj države. Vključevanje krožnega gospodarstva znotraj držav lahko izboljšamo s pomočjo finančnih spodbud. Diploma je napisana z uporabo opisne metode, s katero smo predstavili teoretično ozadje in definicije. Uporabili smo tudi kvalitativno raziskavo in primerjalno metodo. Ugotovljeno je, da so zametki krožnega
Keywords: krožno gospodarstvo, EU-13, politične usmeritve, izzivi, ovire
Published in DKUM: 27.02.2019; Views: 1299; Downloads: 118
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