Juraj Dobrila University of Pula
Recent publications
The aim of this study was to examine the impact of selected ethical factors of business on the perception of defined attributes of decline in the small- and medium-sized enterprise sectors of the V4 countries. The perceptions of ethical business factors between entrepreneurs–engineers and entrepreneurs–non-engineers were evaluated. The study underscores the need for permanent implementation of corporate social responsibility (CSR) analyses from a multilevel perspective that allows the integration of different theoretical frameworks. The results of the study justify the need to carry out deeper structured analyses of the ethical aspects of micro-CSR business at the individual or group level, taking into account multiple categorisation lines. This study also confirms the psychological effects of perceived CSR on a company’s decline. This can be especially advantageous in identifying opportunities for the better use of CSR strategies and in creating adaptive CSR concept platforms.
This study presents an overview of the status of publications related to creativity, communication, and leadership linked to entrepreneurship. A total of 9308 documents extracted from Web of Science (WoS) and Scopus have been evaluated from a global perspective. However, 3409 research articles, extracted from the WoS core collection, were reviewed in depth additionally using graph theory and text-to-network techniques. It considers the importance of the link between entrepreneurship and those elements considered skills by databases such as World Economic Forum (WEF), Global Entrepreneurship and Development Institute (GEDI), and European Skills, Competences, Qualifications and Occupations (ESCO). The real relevance of scientific papers was identified through analysis based on several tools—Google's Page Rank algorithm, VosWiever, Bibliometrix, and Biblioshiny—in various scientometric reviews. The main themes linked to the investigated concepts were identified in relation to the research objectives, allowing us to generate future research guidelines and proposals. The median year for publication is 2016; more than half of the publications by top authors between 2004 and 2022 were published after 2016. These insights allow us to highlight the growing interest in skills linked to entrepreneurship.
As the integration of entrepreneurship and strategic management, strategic entrepreneurship (SE) and related research has been developing for more than 20 years. Enterprises need such a holistic perspective to survive and thrive in the current competitive environment, capturing the efforts to achieve long-term goals, as do entrepreneurs and managers. A comprehensive review scans the evolution of this integrated domain based on 365 publications extracted from Web of Science (WoS), which span from 2001 to 2021, while the knowledge and methods of bibliometrics are mainly employed to complete the process of analysis. To be specific, three aspects are primarily focused on: general characteristics of publications, cooperative relationship network and crucial content. All the analysis steps are realized through bibliometric visualization software VOSviewer and CiteSpace, and the results are then demonstrated in the form of data and graphs for conclusion and discussion. By providing an overall insight into SE, this article gains researchers’ better understanding of theoretical construction and achievements. More importantly, scholars may pay more attention to the development and research of SE from multiple fields.
The relevance of the researched problem is due to the need for monitoring online teaching during the coronavirus pandemic and improving teachers' skills in the process of online teaching and communication with students. The purpose of the research was to find whether there were statistically significant differences in students' positive attitudes towards online teaching conducted in three different study programmes and the communication between students and professors during the coronavirus pandemic. The following methods were used in the research: theoretical (analysis, synthesis, generalisation), diagnostic (Likert scale), statistics and graphical presentation of the results. Our research also shows that students have positive attitudes towards online teaching and communication with teachers. A contribution to such students' attitudes was probably given by the university teachers' existing online teaching skills as well as students' digital skills and competencies owed to the use of social networks. The research aimed to draw attention to the factors that are important for the implementation of quality online teaching in faculties at the time of the pandemic. It emphasised the importance of researching students' perception of the quality of online teaching and various aspects of communication with teachers at a time when they were unable to communicate live. Therefore, the research results can stimulate similar research in higher education to identify those factors that could contribute to the satisfaction of students and teachers with this type of teaching.
This paper describes the improved performance measuring model for vessel dry-docking. Dry-docking represents the operation where the vessel is put out of the water to clean and coat the vessels, and equipment check. This model deals with data collected from thirty-four completed dry-dockings, all supported by the Data Envelopment Analysis (DEA) methodology. To solve the limits appearing from extreme values for some vessels, an extension in the form of the categorical model was introduced. By the categorical model implementation, a more precise efficiency measurement was enabled. The performance calculation results contain the efficiency scores for all vessels and target improvements for the inefficient vessels. Inefficiency sources were detected using the DEA methodology, and the proposed solutions are based on process knowledge and data set. This model also introduced and set the parameters for category division and revealed the benchmarks among the studied vessels. The model introduced can be used for efficiency measurement of similar vessels, or as a prediction-based model by introducing vessels with hypothetic data. This model could also be utilized for similar manufacturing processes which can be found in civil engineering, project manufacturing, or transportation. Further research could be conducted based on the slack-based-measure model, respecting the limitation of data homogeneity.
In recent years, scientific research on sustainable tourism has attracted wide attention, which has fueled the concomitant need to comprehend the current state of research in sustainable tourism. In order to identify the research status of sustainable tourism and explore the direction for future research, this paper presents a comprehensive bibliometric analysis of 2,184 academic literature related to sustainable tourism. By using five bibliometric methods of citation analysis, co-analysis, co-occurrence analysis, burst detection analysis and timeline view analysis, this paper reviews and analyzes the study of sustainable tourism from three perspectives of performance analysis, collaboration networks analysis and keywords analysis. The popular issues in the current study, future research and limitations are also discussed in this paper. By systematically reviewing the academic literature on sustainable tourism, this paper expands and deepens the knowledge and understanding of relevant topics, and provides guidance and reference for scholars to carry out research on sustainable tourism in the future.
The impact of COVID-19 on the economy and business is a major issue. We define convergence clubs as countries with the same impact of COVID-19 on service turnover by using a convergence algorithm for testing and clustering. We repeat the procedure in the hospitality and food industry, information and communication, transport, and storage. The impact of COVID-19 on each convergence club identified in the study varies empirically. The findings suggest that the impact of COVID-19 varies between countries and industries depending on the firm’s agility, innovation, ownership, digital adoption, customer perception, pandemic status, and state financial assistance of companies.
This study explores the problems related to the development of innovation research in the field of business and economics and the change in their characteristics following the coronavirus disease 2019 (COVID-19) pandemic. We compile a comprehensive bibliometric analysis of 17,277 pre-epidemic publications and 4,240 post-epidemic publications from the Web of Science. Using bibliometric methods and visualization tools, we present the changes in these publications following the COVID-19 pandemic, and identify the influential countries and regions, sources, and references, and obtain features of keywords over time. The results show that innovation research is rich in content, and involves a wide range; it has been focusing on emerging topics, such as those concerning low-carbon, innovation forms, and epidemic environments, following the COVID-19 pandemic. This study contributes to the body of knowledge on innovation, and helps to understand the features and structures of innovation research in business and economics.
Osteoporosis is among the most common pathologies. Associated complications in osteoporotic patients, in particular hip fractures and vertebral fractures, cause disabilities and significant quality of life deterioration. Standard treatment of osteoporosis, based on pharmacotherapy does still not yield adequate results, and the problem of osteoporosis remains incompletely solved. Additionally, adverse drug events and fractures after long-termed pharmacotherapy pose additional challenges within designing a proper therapy regimen. Improved clinical approach and new synergistic treatment modalities are consequently still needed. The rationale of the presented study was accordingly, to expand our preclinical animal study on human patients with osteoporosis, based on positive effects on bones observed in animals with osteopenia treated with PMA-zeolite. We specifically monitored effects of PMA-zeolite on the bone quality parameters, fracture risk and quality of life in a cohort of initially recruited 100 osteoporosis patients during a follow-up period of 5 years within a randomized, placebo-controlled and double blinded clinical study (TOP study). Obtained results provide evidence on the PMA-zeolite positive effects on the bone strength of osteoporotic patients as the risk of fractures was significantly decreased in PMA-zeolite-treated patients with respect to time before entering the study (p = 0.002). Statistical evidence point also to positive bone changes in the 5-years TOP study course as evidenced through osteocalcin and beta-cross laps values showing a prevalence of the bone-formation process (p < 0.05). BMD values were not significantly affected after the 5-years follow-up in PMA-zeolite-treated patients in comparison with the Placebo group. Results support the initial expectations based on our previously published preclinical studies on clinoptilolite product PMA-zeolite in animals that could be a new therapeutic option in osteoporosis patients.
Tourism service providers need to have expressive communication skills to be able to offer a better tourism product and create a pleasant tourist experience. To better understand, conceptualize, and achieve the multidimensional concept of communication skills, this paper aims to investigate the literature and propose a measurement scale adapted to the modern tourism workplace. Results, based on a literature review and questionnaire survey, show that five communication skill dimensions emerge: written, oral, listening, digital, and non-verbal communication skills. The paper's theoretical contribution is the systematization of the literature and the conceptualization of communication skills up to date, while its empirical contribution is based on the examination of collected data related to the validated scale measurement. The scale presented in this paper will assist future empirical research on communication skills required in the field of tourism. The paper will help generate novel research questions for identifying and analyzing acquired communication skills.
This paper explores three groups of time–frequency distributions: the Cohen’s, affine, and reassigned classes of time–frequency representations (TFRs). This study provides detailed insight into the theory behind the selected TFRs belonging to these classes. Extensive numerical simulations were performed with examples that illustrate the behavior of the analyzed TFR classes in the joint time–frequency domain. The methods were applied both on synthetic and real-life non-stationary signals. The obtained results were assessed with respect to time–frequency concentration (measured by the Rényi entropy), instantaneous frequency (IF) estimation accuracy, cross-term presence in the TFRs, and the computational cost of the TFRs. This study gives valuable insight into the advantages and limitations of the analyzed TFRs and assists in selecting the proper distribution when analyzing given non-stationary signals in the time–frequency domain.
The natural clinoptilolite material is an inorganic crystal mineral called zeolite. It has been extensively studied and used in industrial applications and veterinary and human medicine due to positive effects on health. Limited data is available in the scientific literature about its effects on the levels of physiologically relevant minerals in the human organism. Accordingly, we performed a comprehensive and controlled monitoring of the relevant mineral and contaminants levels in human subjects supplemented with a certified clinoptilolite material within three clinical trials with different supplementation regimens. Effects of a registered and certified clinoptilolite material PMA-zeolite on selected mineral and metal levels were determined by standard biochemical methods and inductively coupled plasma mass spectrometry (ICP-MS) in the blood of subjects enrolled in three clinical trials: short-term (28 days, Mineral Metabolism and selected Blood Parameters study MMBP), medium-term (12 weeks, Morbus Crohn study), and long-term (4 years, Osteoporosis TOP study) supplementation. Lower concentrations were observed for copper (Cu) in patients with osteoporosis, which normalized again in the long-term supplementation trial, whereas sodium (Na) and calcium (Ca) levels diminished below the reference values in patients with osteoporosis. In the short- and long-term supplementation trials, increased levels of lead (Pb) were observed in PMA-zeolite-supplemented subjects, which decreased in the continued long-term supplementation trial. Increased levels of aluminum (Al) or Pb attributable to eventual leakage from the material into the bloodstream were not detected 1 h after intake in the short-term supplementation trial. Nickel (Ni) and Al were statistically significantly decreased upon long-term 4-year supplementation within the long-term supplementation trial, and arsenic (As) was statistically significantly decreased upon 12-weeks supplementation in the medium-term trial. Alterations in the measured levels for Na and Ca, as well as for Pb, in the long-term trial are probably attributable to the bone remodeling process. Checking the balance of the minerals Cu, Ca, and Na after 1 year of supplementation might be prescribed for PMA-supplemented patients with osteoporosis. Clinical Trial Registration [ https://clinicaltrials.gov ], identifiers [NCT03901989, NCT05178719, NCT04370535, NCT04607018].
Zeolite can impart antibacterial properties to dental materials in the long-term when incorporated with inorganic cations. However, due to its porosity, it may jeopardize the mechanical integrity of the dental material. The aim of this project was to determine the effect on physical properties when zeolite is added to commercially available Ag-reinforced Glass Ionomer Cement (GIC). Sample groups were prepared according to the percentage of zeolite-clinoptilolite (0% - control, 0.5%, 1%, 2%, and 4% wt) added to Ag-GIC. Water sorption, solubility, Vickers hardness, and flexural strength were determined. Specifically, 10 × 2 mm circular disks were fabricated for the Vickers hardness, water sorption, and water solubility tests and 25 × 5 × 2 mm bars were created for the flexural strength test. The results from the surface hardness, water sorption, and flexural strength tests suggested that adding 0.5–4% wt of zeolite to Ag-reinforced GIC did not diminish its physical properties. However, the water solubility results showed that higher concentrations (2–4% wt) of zeolite had a statistically significant increase in water solubility compared to the control. Up to 4% wt zeolite can be incorporated into Ag-reinforced GIC without compromising mechanical properties. Incorporation of 0.5–1% wt zeolite to Ag-reinforced GIC will maintain an adequate surface hardness, water sorption, and flexural strength without compromising water solubility. Further research is needed to determine the effects of higher water solubility on clinical efficacy of zeolite modified Ag-GIC. Graphical abstract
Sustainable business model innovation (SBMI) has received growing attention since it can provide sustainable competitive advantages for corporations under a dynamic external environment. This paper aims to understand the current situations and progress of SBMI research by conducting a bibliometric study of the existing literature. By collecting data from Web of Science and using bibliometric tools, the basic characteristics of SBMI research are first presented to show the productivity and citations of publications utilizing recognized bibliometric indicators. Then, the cooperation networks among countries/regions, institutions, and authors are drawn to determine their collaborative relationships. Furthermore, keyword analysis is presented to explore the evolution of the hotspots and themes of SBMI research through co-occurrence analysis, burst detection analysis, and thematic evolution analysis. Finally, we integrate the antecedents-decisions-outcomes framework for SBMI research. The findings in this study indicate that the development of SBMI research is positive and that greater collaboration among institutions and authors is required to explore the internal drivers and design SBMI as well as other topics to be developed.
In late 2019 and early 2020, a sudden but not unexpected external shock occurred in the tourism industry. This study presents an explorative analysis of the literature review discussing a predicted exogenous shock in tourism caused by the appearance of viruses. Furthermore, the VAR models and panel econometrics is used to analyse and model the impact of the Covid-19 pandemics on tourist arrivals in Slovenia and Croatia. Applied analysis is used to test tourism artefacts in the short term on daily data for 2020. The results of econometric modelling and data plotting confirm significant volatilities in the analysed time-series and their peculiar response to the influence of the Covid-19 pandemic on tourist arrivals. Therefore, innovative tourism policy and management should not expect pre-pandemic values and demand; moreover, tourist expectations will change drastically in a calamitous decade, while several other determinants, not only Covid-19, will influence tourist arrivals. The study is novel in two respects. First, the study adds value to empirical research on the determinants of tourism demand. Moreover, the study can be considered a starting point for further short-, medium-, and long-term econometric analyses of sudden shocks affecting tourism demand and government decisions affecting tourism supply.
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521 members
Tihomir Orehovački
  • Faculty of Informatics
Daniel Tomic
  • Faculty of Economics and Tourism "Dr.Mijo Mirkovic"
Vanja Bevanda
  • Faculty of Economic and Tourism "Dr. Mijo Mirković"
Snjezana Mocinic
  • Dipartimento di Scienze della Formazione
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Pula, Croatia