1. International energy security risk index - analysis of the methodological settingsIztok Podbregar, Goran Šimić, Mirjana Radovanović, Sanja Filipović, Polona Šprajc, 2020, original scientific article Abstract: The main objective of this paper is to analyze model settings of the International Energy Security Risk Index developed by the U.S. Chamber of Commerce. The study was performed using stepwise regression, principal component analysis, and Promax oblique rotation. The conclusion of the regression analysis shows that Crude Oil Price and Global Coal Reserves are sufficient to explain 90% of the variance of the Index. However, if a model that explains 100% of the variance of the Index is chosen and other variables are added, Global Coal Reserves loses importance due to the presence of other parameters in which it is contained. Regardless of the chosen model of analysis, it is evident that there is room for revising the Index and removing variables that do not contribute to its precision. The research showed that the main disadvantage of the variables that make up the Index rests with the fact that the variables are of different degrees of generality, that is, one parameter is contained in other parameters (unclear which other). The research covers data for 25 countries over a 26-year period, with the first year of the research being 1980 and the last 2016 (the latest available report).
Keywords: international energy security risk index, analysis, stepwise regression, principal component analysis, Promax oblique rotation
Published in DKUM: 04.02.2025; Views: 0; Downloads: 16
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2. The international energy security risk index in sustainable energy and economy transition decision making - a reliability analysisIztok Podbregar, Goran Šimić, Mirjana Radovanović, Sanja Filipović, Damjan Maletič, Polona Šprajc, 2020, original scientific article Abstract: The world economy and society are in a complex process of transition characterized by a high degree of uncertainty. Therefore, further development and management of the transition will largely depend on the quality of the decisions made and, accordingly, on the decision-making process itself. The main goal of this study is to analyze the reliability of International Energy Security Risk Index as a tool to support the process of energy and economy transition decision making, as closely related and highly interdependent phenomena. The index is composed of 29 aggregated variables (grouped into eight categories), and the research is conducted on a research sample of 25 countries over a period of 36 years. The reliability assessment is performed by using Multiple Regression Analysis. Multicollinearity test, plus Multicollinearity test with Variance Inflation Factors, is used for methodological verification. The test results indicate a high degree of unreliability of the Index, as is concluded based on the observed errors in its methodological settings. These errors primarily relate to a high degree of multicollinearity in all 29 variables, whereby independent variables lose their independence and thus jeopardize reliability of the total Index. Out of the eight groups of variables, the fuel imports group is the only one that does not show big methodological errors. The paper presents a recommendation for the improvement of the observed Index (review of the role of individual variables found to be particularly methodologically indicative), as well as a recommendation for different distribution of weighting coefficients.
Keywords: energy and economy transition, decision making, international energy security risk index, multiple regression analysis, multicollinearity test, multicollinearity test with variance inflation factors
Published in DKUM: 04.02.2025; Views: 0; Downloads: 7
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3. Vpliv internega marketinga na sposobnost zaposlenih za agilnostGaja Šimić, 2024, master's thesis Abstract: Sposobnost hitrega prilagajanja spreminjajočim se tržnim razmeram in negotovostim je v sodobnem času postala bistvena konkurenčna prednost organizacij. Za učinkovito odzivanje na nepredvidene situacije je nujna agilnost, tako na ravni organizacije kot na ravni zaposlenih. Agilnost ne predstavlja zgolj metodologije, temveč povzema celotno miselnost o načinu vedenja in procesih odločanja, ki se dogajajo znotraj organizacije. Ključne značilnosti agilnosti vključujejo prilagodljivost, proaktivnost in odpornost na spremembe, ki imajo pomembne koristi tako za zaposlene kot tudi organizacijo samo. Interne marketinške strategije igrajo ključno vlogo pri spodbujanju te agilnosti, saj zaposlene obravnavajo kot interne odjemalce. Glavne aktivnosti internega marketinga se osredotočajo na spodbujanje motivacije in internega komuniciranja, izvajanje internih tržnih raziskav in nenehno usposabljanje, ki skupaj ustvarjajo podporno okolje za vzpostavitev agilnega vedenja. V magistrskem delu smo podrobneje opredelili posamezne dimenzije preučevanih konceptov in obravnavali, kakšen vpliv ima interni marketing na sposobnost zaposlenih za agilnost. Pri tem je pomembno upoštevati, da respondenti največjo vrednost internega marketinga zaznavajo v jasnem zaznavanju podobe blagovne znamke, usklajenih sporočilih, ki jih prejemajo v okviru delovnega mesta ter v organizacijskih prizadevanjih za usposabljanje zaposlenih. V okviru agilnosti pa povprečno najvišje strinjanje izkazujejo na področju iskanja priložnosti za izboljšave pri delu in pri iskanju učinkovitejših načinov za opravljanje svojega dela. Nadaljnje raziskave, ki smo jih izvedli, so pokazale, da interni marketing pozitivno vpliva na vse obravnavane dimenzije agilnosti. Na podlagi podatkov pridobljenih v magistrskem delu, lahko trdimo, da imajo zaposleni v organizacijah, ki izvajajo strategije internega marketinga, večjo verjetnost, da bodo razvili proaktivno vedenje, se hitro prilagodili različnim situacijam ter postali odporni na nenadne spremembe in stresne okoliščine. Te ugotovitve poudarjajo pomen internega marketinga pri oblikovanju agilne delovne sile.
Keywords: interni marketing, agilnost, proaktivnost, prilagodljivost, odpornost na spremembe
Published in DKUM: 12.09.2024; Views: 24; Downloads: 30
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4. Decision-making in sustainable energy transition in Southeastern Europe : probabilistic network-based modelNena Hribar, Goran Šimić, Simonida Vukadinović, Polona Šprajc, 2021, original scientific article Abstract: Background: Sustainable energy transition of a country is complex and long-term process, which requires decision-making in all stages and at all levels, including a large number of different factors, with different causality. The main objective of this paper is the development of a probabilistic model for decision-making in sustainable energy transition in developing countries of SE Europe. The model will be developed according to the specificities of the countries for which it is intended—SE Europe. These are countries where energy transition is slower and more difficult due to many factors: high degree of uncertainty, low transparency, corruption, investment problems, insufficiently reliable data, lower level of economic development, high level of corruption and untrained human resources. All these factors are making decision-making more challenging and demanding.
Methods: Research was done by using content analysis, artificial intelligence methods, software development method and testing. The model was developed by using MSBNx—Microsoft Research’s Bayesian Network Authoring and Evaluation Tool.
Results: Due to the large number of insufficiently clear, but interdependent factors, the model is developed on the principle of probabilistic (Bayesian) networks of factors of interest. The paper presents the first model for supporting decision-making in the field of energy sustainability for the region of Southeastern Europe, which is based on the application of Bayesian Networks.
Conclusion: Testing of the developed model showed certain characteristics, discussed in paper. The application of developed model will make it possible to predict the short-term and long-term consequences that may occur during energy transition by varying these factors. Recommendations are given for further development of the model, based on Bayesian networks.
Keywords: sustainable energy transition, SE Europe, decision-making, Bayesian networks
Published in DKUM: 19.08.2024; Views: 88; Downloads: 12
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5. Prices of conventional and renewable energy as determinants of sustainable and secure energy development : regression model analysisSandi Knez, Goran Šimić, Anica Milovanović, Sofia Starikova, Franc Željko Županič, 2022, original scientific article Abstract: Background
The prices of energy resources are important determinants of sustainable energy development, yet associated with significant unknowns. The estimates of the impact of prices of energy products in the domestic market (for domestic consumers) are rare—hence the importance and novelty of this research. Therefore, the main goal of the paper is to assess the impact of domestic prices of gasoline, gas, coal, and solar energy on sustainable and secure energy future.
Methods
The research includes 14 countries (of which 7 are developed and 7 are developing countries) and a period of 5 years (2014–2018). The model also includes discrete variables: level of development (developing or developed), and the fact as to whether the country is an energy exporter or not. For the purposes of analysis, the following elements were used: Panel Data Analysis, Linear regression (with random and fixed effects), Durbin–Wu–Hausman test, and Honda test, with the use of R-studio software for statistical computing.
Results
The research showed that the biggest negative impact on energy sustainability was recorded by an increase in the price of coal and the smallest one by an increase in the price of solar energy. An increase in the price of gasoline has a positive impact, while an increase in the price of gas has no impact. The basic methodological result showed that the fixed effects linear model is more accurate than the random effect model.
Conclusions
The results of the paper, important as a sustainable energy policy recommendation, showed that the impact of changes in energy product prices is significantly greater in developing countries, but that the status of the country as an energy exporter has no significance. In addition, the paper points to the need to intensify the research on the assessment of the impact of energy product prices for domestic consumers on their ability to pay that price, because with a certain (so far undefined) increase in energy product prices, a certain group of domestic consumers moves into a category that is not in line with sustainable energy development and is extremely undesirable in every respect—energy poverty.
Keywords: sustainable energy development, conventional energy prices, solar prices, developing countries, R-studio
Published in DKUM: 26.06.2024; Views: 133; Downloads: 14
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6. Energy security of the European Union and corruption in Central Asia as the main challenges for the European sustainable energy futureBojana Vasić, Ivan Pekić, Goran Šimić, 2023, original scientific article Abstract: Background
The main goal of the paper is to define, analyze and assess the basic security, development and institutional challenges faced by the Central Asian countries after 2022. Following the COVID-19 pandemic, and with the outbreak of the Ukrainian crisis, Europe faced problems in ensuring energy security, which were further complicated by its decision to stop importing natural gas from the Russian Federation. The Central Asian region is rich in energy resources, but at the same time, it is also a region of special geopolitical interest of often-conflicting parties, characterized by limited information and insufficient academic literature about development, various aspects of security, internal specificities and future challenges.
Methods
The research included qualitative and quantitative analyses carried out for Kazakhstan, the Kyrgyz Republic, Turkmenistan, Uzbekistan, Tajikistan and Germany. Data processing was performed based on 16 selected indicators in the fields of economy, energy, governance and climate change, for the time period 2011 to 2021. Data processing was performed using correlation and regression analysis (ANOVA).
Results
The results showed that corruption represents one of the biggest problems faced by the countries of Central Asia, with the biggest variations in the calculated Standardized Confidence level, which shows that this indicator trend, in relation to the 16 indicators used, is the least predictable. This represents a significant problem for all countries that are supplied with energy products from this region, or plan to do so. Energy security is positive only in the case of Turkmenistan. Regression analysis shows that Kazakhstan reported the best positive trend for most indicators. Data for Germany show consistent values over the observed period.
Conclusions
The main conclusions of the paper indicate that the countries of Central Asia have certain specificities when it comes to sustainable development, where energy security, corruption and government efficiency can be considered the biggest problems. The European Union must find ways and mechanisms to overcome these and many other impediments if they decide to import energy products from the aforementioned region.
Keywords: energy security, corruption perception, governance efectiveness, Central Asia, Germany
Published in DKUM: 15.04.2024; Views: 257; Downloads: 12
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7. Sustainability-oriented surface modification of polyester knitted fabrics with chitosanTanja Pušić, Tea Bušac, Kristina Šimić, Mirjana Čurlin, Ana Šaravanja, Katia Grgić, Julija Volmajer Valh, 2024, original scientific article Abstract: The existing research deals with the process of modifying polyester knitted fabrics and polyester/cotton knitted fabrics with chitosan and the stability of functionalized surface with chitosan in the washing process according to a standard and an innovative washing procedure. The current research concept aims to evaluate the degree of progressivity and progressiveness: the modification of polyester knitted fabrics with chitosan and an innovative washing process. The polyester and polyester/cotton fabrics modified with chitosan were characterized by a staining test, microscopic analysis, zeta potential measurement, and pilling tendency of the knitted fabrics before and after five and ten washing cycles with reference detergent ECE A. The results of the zeta potential measurement of knitted fabrics functionalized with chitosan confirmed cationization of the polyester and polyester/cotton fabric with chitosan. The presence of chitosan on the washed knitted fabrics in reduced quantities is demonstrated by the staining test, the colour strength (K/S), and the zeta potential values. The staining test and surface charge of the tested knitted fabrics confirmed the research hypothesis regarding the degree of progressivity of the modification of polyester and polyester/cotton knitted fabrics with chitosan and the sustainability of the innovative washing process. The streaming potential proved to be a favorable method for monitoring the stability of chitosan in the washing process in combination with a staining test with the selected dye Remazol Red RB.
Keywords: knitted fabrics, polyester, polyester/cotton, chitosan, washing, surfaces
Published in DKUM: 05.02.2024; Views: 285; Downloads: 25
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10. Predlog modela usposabljanja strokovnih delavcev v triatlonuMateja Šimic, 2021, undergraduate thesis Abstract: V diplomskem delu je predstavljen predlog modela usposabljanja za naziv Strokovni delavec 2 – športno treniranje – triatlon, duatlon, akvatlon. Triatlon kot olimpijski šport je izjemno zanimiv, s svojo raznovrstnostjo in možnostjo aktivnega ukvarjanja skozi vsa starostna obdobja pa vzbuja vse večje zanimanje med širšo množico.
V diplomskem delu se prepletajo različne metode, v največji meri sem uporabljala deskriptivno metodo dela. Večino potrebnih podatkov sem pridobila iz literature (Nacionalni program športa v RS 2014-2023, Zakon o športu, Pravilnik o usposabljanju strokovnih delavcev v športu ipd.), nekaj pa tudi prek Programsko-strokovnega sveta Triatlonske zveze Slovenije.
Glavni namen in cilj diplomskega dela je bila izdelava predloga modela usposabljanja strokovnih delavcev na 2. stopnji športnega treniranja v triatlonu in njegovih izpeljankah po postavkah kurikuluma ter v skladu s Pravilnikom o usposabljanju strokovnih delavcev v športu, saj Triatlonska zveza Slovenije še nima ustrezno potrjenega programa na tej stopnji.
Z uporabo takšnega modela usposabljanja bi lahko Triatlonska zveza Slovenije v prihodnosti pridobila večje število strokovnih delavcev, ki lahko izvajajo program športnega treniranja triatlona, duatlona in akvatlona, omogočila kakovostno vadbo večjemu številu vadečim ter dosegla večjo strokovnost in konkurenčnost strokovnega kadra.
Keywords: usposabljanje, strokovni delavec, triatlon, kurikulum, Triatlonska zveza Slovenije
Published in DKUM: 02.11.2021; Views: 945; Downloads: 45
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