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Abstract: Since the discovery of the Differential Evolution algorithm, new and improved versions have continuously emerged. In this paper, we review selected algorithms based on Differential Evolution that have been proposed in recent years. We examine the mechanisms integrated into them and compare the performance of algorithms. To compare their performances, statistical comparisons were used as they enable us to draw reliable conclusions about the algorithms’ performances. We use the Wilcoxon signed-rank test for pairwise comparisons and the Friedman test for multiple comparisons. Subsequently, the Mann–Whitney U-score test was added. We conducted not only a cumulative analysis of algorithms, but we also focused on their performances regarding the function family (i.e., unimodal, multimodal, hybrid, and composition functions). Experimental results of algorithms were obtained on problems defined for the CEC’24 Special Session and Competition on Single Objective Real Parameter Numerical Optimization. Problem dimensions of 10, 30, 50, and 100 were analyzed. In this paper, we highlight promising mechanisms for further development and improvements based on the study of the selected algorithms.
Keywords: global optimization, differential evolution, benchmark suite, mechanisms, statistical tests, performance
Published in DKUM: 19.05.2025; Views: 0; Downloads: 2
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Abstract: The purpose of this article is to provide an insight into the specifics of social entrepreneurship in different business environments. The article, therefore, examines selected characteristics of social enterprises, namely social value, innovations, and market activities. In addition, differences in the start-up and operational phases of social enterprises were measured. Social enterprises must operate in a specific business context, which essentially hinders or promotes social entrepreneurship. As culture differs between north-western and south-eastern Europe, it is important to examine the differences in social entrepreneurship between these two groups of countries. To analyze the proposed characteristics, we used the latest data from the Global Entrepreneurship Monitor special report on social entrepreneurship. The results indicate that there exist differences in social impact measurement between observed groups of countries. Additionally, we confirmed differences between the observed groups of countries in terms of innovations and market activity of social enterprises in the operational phase. Our results also suggest that social entrepreneurship is more developed in north-western European countries than in south-eastern ones, with some elements in the north-western countries being more noticeable in the operational phase compared to the start-up phase.
Keywords: social entrepreneurship, social value creation, innovations, market activity, Global Entrepreneurship Monitor, GEM
Published in DKUM: 23.01.2025; Views: 0; Downloads: 6
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Abstract: Energy-consuming countries are affected by obstructions in supplies or conflicts that mayoccur along the energy transit path. Hence, the presence of a global logistics hub for energy acting as a connecting bridge between energy-supplying and energy-consuming countries can overcome suchtroubles, support the sustainable flow of energy, and achieve the overall operational efficiency of theenergy supply chain. However, establishing a global energy hub is a complicated issue, especiallyin the absence of a clear approach for this. Through conducting a systematic literature review on 36 papers over the past two decades, we identified the key determinants for each player in theenergy supply chain and proposed a leading and integrated conceptual framework for establishing and operating a global logistics energy hub, with a particular focus on oil and gas. This article contributes to knowledge by providing a comprehensive review targeting energy hubs from a logistics perspective, as previous studies have addressed energy hubs from other perspectives suchas political, legal, and security perspectives, while the logistics perspective has not been tackled comprehensively. Moreover, the suggested framework can be then used by further researchers to develop the performance of energy hubs. Practically, this framework can be employed to identify the requirements for a country to become a global energy hub.
Keywords: global logistics energy hub, energy supply chain, energy transit corridor, oil, gas, conceptual framework, supply chain management, logistics
Published in DKUM: 19.08.2024; Views: 78; Downloads: 11
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Abstract: The rapid spread of the English language, which is frequently referred to as a lingua franca, has had a significant impact on other languages and the peculiar language of computer-mediated communication. What is more, the Internet, social media and digital influencers are the key agents of both language change and changes in the modern society. Due to the globally growing popularity of social media influencers, the purpose of this thesis is to explore the ways in which their language use is affected by the globality of English, with a focus on Croatian influencers. Therefore, data for this paper are drawn from altogether 270 social media posts published by the eight most successful Croatian influencers on YouTube, Instagram and TikTok. The research methods include linguistic, thematic and content analysis. The results reveal that the use of ‘ad hoc loanwords’ and intra-sentential code-switching are more common among Croatian influencers in comparison with outdated Anglicisms and inter-sentential code-switching. While the most frequently used loanwords among Croatian influencers belong to the categories of cyberculture and popular culture, the use of loanwords belonging to particular semantic fields is not strongly related to their thematic content categories. The importance and originality of this thesis are that it is the first study to provide new insights into the language use of Croatian influencers in relation with English as a global and leading online language. However, due to practical constraints, it is limited in terms of the research sample size and generalizability, which offers implications for further research.
Keywords: English as a global language, influence of English on Croatian, Croatian social media influencers, computer-mediated communication, loanwords, code-switching
Published in DKUM: 04.01.2024; Views: 544; Downloads: 98
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Abstract: The scientific monograph comprises results of the Slovenian part of the largest global research project on entrepreneurship Global Entrepreneurship Monitor – GEM, which has completed its 19th cycle in 2017. GEM was established in order to (1) measure the differences regarding the relationship towards entrepreneurship, activities and aspirations of individuals in as many countries as possible, (2) uncover factors that encourage or hinder entrepreneurial activities, especially related to societal values, personal attributes and the entrepreneurship ecosystem, (3) provide a platform for assessing the extent to which entrepreneurial activity influences economic growth within individual economies and (4) uncover policy measures for the purpose of enhancing entrepreneurial capacity in an economy. The research helps to better understand the attitude of the society towards entrepreneurship and individual capabilities, among which are the perception of their own abilities for entrepreneurial activities, the ability to perceive opportunities, entrepreneurial intentions and fear of failure. As GEM monitors entrepreneurial activity throughout the phases of the life cycle (nascent, new businesses and established businesses, discontinuation), according to impact (high growth, innovation, internationalization) and by type (early-stage entrepreneurship activity, employee entrepreneurship activity), the picture is much richer than the one that is based only on data gathered from ordinary statistical databases.
Keywords: Global Entrepreneurship Monitor, entrepreneurship, early-stage entrepreneurial activity, economic development, entrepreneurship ecosystem
Published in DKUM: 02.08.2023; Views: 540; Downloads: 8
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