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This paper provides an overview of the application of social networks in Serbian entrepreneurship and the entrepreneurial ecosystem. Social networks have become a necessary marketing tool in business since their inception for scientific and social purposes. There is almost no business branch that operates without the use of social networks, as an auxiliary or basic marketing tool. In Serbia, social networks have experienced significant expansion in recent years, and everyday life is almost unimaginable without platforms like Instagram, Facebook, and Twitter. Entrepreneurship in Serbia heavily relies on social networks for marketing and operational purposes. On the other hand, the entrepreneurial ecosystem is a term that has attracted a lot of attention from scientists and researchers in the last ten years. The main goal of entrepreneurship is to create an economic and social system that enables business growth and development, which will also contribute to the economic prosperity of the country. Entrepreneurial ecosystems encompass a broader concept, intertwining entrepreneurs, organizations, individuals, and institutions at the national level to support and catalyze entrepreneurship development collectively or systemically. The aim of this paper is to elucidate the concept of the entrepreneurial ecosystem in Serbia and demonstrate the use of social networks for its growth and development in the modern business environment.

This paper presents the onomastic material from Korman, a village located in the northwestern part of Pomoravlje of Aleksinac. After some remarks about the village itself, the paper contains a list of microtoponyms as well as a list of anthroponyms, including surnames, male personal names, female personal names, male nicknames, female nicknames, male hypocoristics and female hypocoristics. The main reason for extracting the onomastic material from Korman is that it has not yet been presented to the scientific public and the material presented in this paper will serve for future broader onomastic research.

A new method for the accurate measurement of safety rod drop times is proposed. It is based on a fast electromagnetic transducer and an analog-to-digital converter (ADC) connected to a computer system. Evaluation of recorded data is conducted by a developed computer codes. The first measurements performed at the HERBE fast-thermal RB reactor show that a relative uncertainty (confidence level 95%) of less than 6% can be achieved in determination of rod drop time (with time intervals ranging from 0.4-10.0 s). Further improvements in accuracy are possible.

The application of innovative technologies that foster smart production resources’ interconnectivity alongside the virtual space that facilities to support process simulation makes the technology factor become the center of Industry 4.0. The production process modeling and simulation can be used to facilitate flexibility and automation of a shop floor. In our previous research, we have created a Domain-Specific Modeling Language (DSML) named MultiProLan, aiming to create production process models suitable for the automatic generation of executable code that enables the automatic execution of production processes. As the next step, we have proposed research on a DSML language aimed at Industry 4.0 human worker modeling. Industry 4.0 still considers workers as a cost, while favoring technological aspects over the workers’ wellbeing. Industry 5.0 complements Industry 4.0, focusing on a human-centric approach that puts core human needs and interests at the top of production processes. Based on our research proposal, here we present a blueprint of the HResModLan DSML prototype aimed at the formal specification of a human worker within Industry 5.0. Presented abstract and concrete syntaxes of the language are tested on a case study of a furniture factory to demonstrate whether they are a good base for the further development of the HResModLan language.

This paper examines physical activity and exercise as used for the health of the ancient Greeks. Records and testimonies from philosophers, trainers, physicians, athletes... guided people toward improving vitality through exercise. These sources contain historical facts relating to the maintenance of individual physical, psychological, social and affective health through movement and exercise. Conclusions about the continuous relationship between direct physical activity and exercise (PAE) and physical exercise and health (PEH) were reached through multifaceted analysis (historical, comparative, causal, semantic) and synthesis, as well as inductive and deductive reasoning. The subject of this paper is the common-sense recognition and deliberation on the significance of PAE for human health during the paleo society, its problematisation and application in practice leading to PEH. The starting premise is cognitively provocative, referring to the origins and utility of paleo science and practice in today's understanding and practice of PAE and PEH. Paleo philosophers believed that PAE, only in optimal amounts, i.e., the "measure of common-sense moderation, " can have a beneficial, positive effect on a healthy lifestyle for humans/athletes. Their frequent critical views on deviations from the common-sense essence of PEH were directed towards preserving the benefits of a healthy lifestyle-PEH. They believed that common sense (bon sens) represents the fundamental axiom for the development of "practical science, " through which the problems of the life of an individual, society and nature were understood, solved, and guided. Philosophers, physicians, and trainers were the most knowledgeable about the importance of PAE for a healthy lifestyle of an individual in ancient Greece! The second premise, although sporadically considered in this paper, contains meaning and expression for provoking modern science and practice of PAE and PEH, pointing out that there is a current tendency of individuals to relinquish the common-sense nature of exercise in favour of personal prophylaxis. The conclusion is that despite sometimes "aggressive" efforts of the society to institutionalise PAE to PEH, individuals continue to seek the factors of health, sustainability and survival (conditio humana). Although direct and simple life activity, PEH appears to be an unknown determinant of the quality of life, as if theories on nature and nurture in human development through PAE are not truthful.

Modern diagnostics of athlete preparation involves the acquisition ofalargenumberof data,whichrequiressuperiorknowledge,serious logistics, protocols, staff, time, etc. Technological breakthroughs in surface electromyography (sEMG) in measuring the activities of respiratory muscles in vivo opened new possibilities in this direction. The correlation between physical preparedness and the ability to maintain breath has been a theoretical phenomenon for over a century.The result at the duration of the breath holding time (BHT) is generally considered a positive indicator of the volume of respiratory capacity during physical activity. Experimental research determined involuntary activities of auxiliary respiratory musculature at the end of the quiet retention of breath and are determined as a physiological break point of breath holding. The time from the start of the breath holding to the first involuntary breathing movement (IBM) is called the control pause (CP). Since this time is not the physiological maximum of breath holding, it is very important to determine the exact moment of reaching the first IBM and the time-frequency characteristics of sEMG signals during the IBM phase (work problem). Using Wavelet methodology, the analysis of sEMG signals is performed on three skeletal muscles, two inhaling (M. Scalenus - Anterior et Medium - SC, and M. Parasternal Intercostales-IC) and one exhalatory (M. Rectus abdominis - Ra), that in addition to others, have auxiliary role and function in the respiratory cycle, and that are sensitive to physiological changes due to apnea, so in their neuromotor response are a possible indicator of metabolic processes that are detected as involuntary breathing movements. Multiple growths in the electrical activity of these muscles during IBM in certain frequency ranges have enabled precise IBM measurement, thus determining the physiologically acceptable duration of the CP. Observation and analysis of the specific respiratory and muscular response indicate dominations of hypoxic or hypercapnic metabolic condition (subject of research). Based on monitoring these changes in 12 subjects classified in the group categorized amateur athletes, it was determined that better-trained subjects have longer CP and react hypercapnically. The conclusions of this non-experimental case study correspond to the practice of training preparation but open the space for new research, primarily those who should develop an affordable method for non-invasive realtime physical preparation.

This paper considers direct mobile-to-mobile (M2M) communications with a dual antenna selection (AS) system at a destination mobile node (DMN) in interference limited, dissimilar composite fading environments. In particular, we model dissimilar interference limited signals at the inputs of the dual branch AS system as (i) the ratio of two Nakagami-m (N) random variables (RVs) at the first branch and (ii) the ratio of two Rice RVs at the second branch, in order to account for non line-of-sight (NLOS) and line-of-sight (LOS) communications, respectively. Moreover, we assume variable powers of the desired as well as interference signals at the output of the DMN in order to account for the impact of shadowing. For the proposed model, we derive probability density functions, cumulative distribution functions, outage probabilities and average level crossing rates. The derived statistical results are evaluated for all the statistical measures considered and are graphically presented in order to provide insight into the impact of composite fading severities and LOS factors for the desired signal, as well as for the interference, on the system performances.

This paper discusses the body of an athlete (sport), ancient Greek sculpture (history of art), digital environment (digital devices - new technologies) and sports marketing (new information systems in business) thus enabling support to different approaches to the system of knowledge in each of the given disciplines. The interdisciplinary (pluralistic) approach opens a possibility to expand not only knowledge, but the scientific awareness as well. The subject of the paper focuses on the phenomenon of the 'permanent record' of sculptures whose theme refers to the events related to an athlete's body in the period of Ancient Greece. Owing to its values, the contents of these masterpieces have had a beneficial effect as they influenced the art of each subsequent period of civilization and are preserved for the future. In the course of a more detailed research and analysis of the history of heritage, new knowledge has been gained that can contribute to the general benefit of the society that we live in. In the digital world, 3D computer animation takes up a very important place within the mass and popular media thus becoming not only the guardian of the heritage of ancient Greece sculptural art depicting the bodies of athletes, but also one of the integral parts of today's general culture, which is mostly used in the promotion of marketing in sports. It is thought that this paper can be inspiring for others in generating new original ideas towards further research.

This research study focuses on the male and female nicknames recorded in the village Donji Ljubeš, located near Aleksinac. The nicknames are analysed from the aspect of motivation and classified into twelve groups. Criteria to determine the motivation were received from local residents. In this field research, 160 personal nicknames were collected. There are 139 male and 21 female nicknames. As a contribution to the work, a dictionary of nicknames was compiled. The collected material was accentually and semantically processed. Considering that the research of this kind in the area of Aleksinačko Pomoravlje is in deficit, this study can significantly contribute to the onomastics of the given area.

This paper deals with theonyms and also with other similar names that are motivated by onyms and appellative lexis of the Christian origin and which are part of the wider study concerned with names as recorded in Radomir Andrić's poetry. Semantical analysis and classification of theonyms, biblical names, Christian holy days, church names, icons, frescoes and other chrematonyms, personal names and nicknames of the holy men and of other similar onyms. The paper is followed by dictionary which is consisted of authentic, real names and unauthentic, unreal names of different types and kinds.

Introduction/Objective. Numerous studies on surface electromyographic (sEMG) signals in response to different respiratory parameters, particularly on sternocleidomastoid (SCM) muscles and diaphragm (DIA), indicated the promising advantages of their simultaneous monitoring with possible applications in the analysis of their correlation. This motivated а detailed statistical analysis of the average power (PAV) on sEMG signals during prolonged breath-holding, simultaneously measured in the SCM and DIA areas. Methods. The physiological breath-holding method was applied to 30 healthy volunteers, with sEMG of SCM and DIA regions measured before, during, and after the breath-holding exercise. All the subjects were sitting in an upward position, with nostrils closed by the right index finger and thumb during breath-hold. To synchronize the records, the user would press a special switch using the other hand at the beginning and at the end of breath-holding experiment. The average power of sEMG (PAV) was measured for each 500 ms signal window. Results. The PAV remains constant before and 3 seconds after the exercise. During the ending of breathholding, at least one region had the PAV afflux of a minimum of 91%. Student’s t-test between SCM signals shows a significant difference of p < 0.001, while the DIA lacks it. Although the results showed that SCM is the dominant region in 76.67% of cases, the exclusive PAV afflux in the DIA region was detected in precisely five cases (16.67% of the total namber of participants). Conclusions. Our research concludes that there is the necessity of simultaneous measurement of SCM and DIA to observe dominant changes in sEMG during breath-holding. The physiological response of the respiratory center can be observed by approximately doubling PAV in one of SCM or DIA regions.

Background/Aim. Ultrasonography is a cheap, easily available and convenient method for diagnosis. The aims of this study were: to determine the utility of ultrasonography for preoperative identification and localization of enlarged parathyroid glands (PTG) in patients with different forms of hyperparathyroidism (HPT); to examine the frequency of PTG detection in patients previously non-suspected for HPT but having symptoms relevant to the disease; to determine sensitivity and positive predictive value (PPV) of ultrasonography for identification of PTG in HPT and to compare obtained results with those obtained by scintigraphy. Methods. This investigation was designed as a retrospective–prospective study. The total number of patients undergoing ultrasonography prior to surgery was 179 and the number of those subjected to scintigraphy, mostly by the 201Tl/99mTc method, was 112. The patients (52 male, 128 female) were divided into the following four groups: group A – patients with primary (p)HPT (n = 78); group B – patients with secondary (s)HPT (n = 47); group C – patients with tertiary (t)HPT (n = 13); group D – patients with unrecognized (u)HPT, but with anamnestic data implying the disease (n = 42). High resolution ultrasonography was performed by a single experienced observer. Diagnosis of HPT was based on characteristic clinical and biochemical parameters. Final proof of HPT diagnosis was surgery followed by histopathological examination. Results. Ultrasonography detected enlarged PTG in 93.85% of total patients, whereas scintigraphy uncovered 75.89% of positive cases (p < 0.05). The total number of positive PTG detected by ultrasonography was 211 vs 225 detected by surgery (sensitivity – 95.9%; PPV – 99.4%). Histopathology confirmed the predominance of adenoma in the A and D groups in comparison with the B group of patients having PTG hyperplasia. The group C was characterized by the presence of adenomas in hyperplastic PTG. The mean size of PTG measured by ultrasonography was 17.59 ± 8.0 mm (n = 164) vs 18.36 ± 8.54 mm (n = 179) measured after surgery. Ultrasonography proved itself as an accurate technique in all HPT groups, regarding its high sensitivity (range 93.6–100%) and PPV (95.6–100%). In contrast, scintigraphy was shown to be less reliable, especially in the sPTH group (sensitivity: 51.7%; PPV: 78.4%). Conclusion. Ultrasonography is more sensitive and accurate method for pre-operative localization of PTG in comparison with 201Tl/99mTc scintigraphy. It can be also efficiently used for detection of PTG and diagnosis of HPT in patients previously not suspected for this disease.

The subject of this research is the individual respiration constant calculated based on the respiratory musculature breathing equation. This non-experimental observation conducted on a sample of students from the Faculty of Sports and Physical Education in Belgrade (N=30). The measurement aimed at the acquisition and analysis of the average power of the surface electromyography signal (sEMG) in the protocols before and after prolonged respiratory retention. The results of the research showed that the individual coefficient of control break (Cp) represents a unique characteristic of the respiratory muscles of the subjects. In a relatively trained sample of young people of both sexes, it determined that after holding their breath, until the moment of the so-called "stroke" (progression of respiration to adapt to a stressful situation), recovery time has a linear course and is directly related to the engagement of the monitored respiratory muscles of the subjects, i.e., indirectly the capacity of the individual to assimilate O2 from the inhaled air. In the practical meaning of this research, we emphasize that individual results can be correlated with the equation of respiration of respiratory muscles, to find out and approach the original method for the presented personal respirational constant.

The subject of this paper is the motivation of personal names in village Donji Ljubeš, which is located in the northwestern part of Aleksinačko Pomoravlje. The research is based on a corpus that makes both male and female personal names excerpted from birth registers born in that village. The personal names of people are analysed from the semantic aspect. There are 72 male names registered for 172 people and 81 females names registered for 181 people. A total of 153 personal names of Slovenian origin were listed, by which 353 persons were named. This paper contributes to the onomastic research of Aleksinačko Pomoravlje, since the papers of this type in the given area are in deficit.