Predmet ovog članka je odnos između moći i pravde u ljudskom društvu, govoreći u širem smislu. Uže posmatrano, odnos između, od čoveka neodvojivog, osećaja inferiornosti, iz kojeg se, usled sprege ...straha i potrebe za većom bezbednošću tela, rađa nagon za moć, koji u većini slučajeva nikada ne biva zadovoljen. Cilj članka je da pokaže da postoji veza između nedovoljne količine akumulirane moći koja se uvek meri u odnosu na nečiju tuđu moć, sa jedne strane, i porekla potrebe za društvenom pravdom, sa druge strane. Teorijski okviri koji su korišćeni se odnose, pre svega, na psihologiju čoveka Alfreda Adlera i teoriju pravde Džona Rolsa, ali i na teorije društvenog ugovora i realpolitičku teoriju. U članku smo došli do zaključaka koji se odnose na potvrdu teze da se održavanje koncepta društvene pravde pre da objasniti kroz realpolitičku teorijsku paradigmu, nego gledajući sa pozicija normativno-ontološke paradigme politike.
In a typical wireless power transfer (WPT) system, the load, the mutual inductance, and the required tuning frequency can vary in a particular range. Variation of each parameter can substantially ...impact the dynamic characteristics of the system. Thus, they can be considered as sources of uncertainty in the system. To address this, robust control methods such as μ-synthesis are developed to deal with possible system uncertainties. This article first undertakes the generic dynamic analysis of the series-series WPT compensation network for two modes of operation, i.e., constant output voltage (COV) mode and constant output current (COC) mode, in the presence of three aforementioned uncertainty sources. Subsequently, the frequency detuning as a function of the compensation capacitor variation is explored and broadened as a technique to obtain the optimized compensation capacitor value that can lead to a plant with minimized dynamic deviations from its nominal system in the operating range between COC and COV modes. As such, this approach offers a design procedure for a least conservative robust controller, which can significantly improve the system performance. The optimized structure and the corresponding designed μ-synthesis controller are comprehensively elaborated. The theoretical achievements and experimental results show superior dynamic performance of the optimized structure and the corresponding designed controller in the presence of three uncertainty sources compared to the COC and COV modes of operation.
Metaheuristic techniques have shown remarkable performance in a vast variety of engineering problems. Accurate solving of nonlinear equation set in selective harmonic elimination (SHE) has been one ...of the widely discussed numerical problems in power electronics. Current study aims at conducting an inclusive comparison of prominent stochastic methods adopted for SHE and modified SHE (MSHE) pulse width modulation techniques. The problem is defined as finding local optima of cascaded H-bride converter operation parameters. The survey investigates key indices of low-order harmonic components and weighted total harmonic distortion. Floating fundamental component is introduced for SHE and MSHE to achieve higher rate of flexibility for optimization techniques. Finally, an advanced modulation technique is proposed to address the dc-link voltage ripples. Simulation and experimental results are presented as a proof of concept.
The aim of this study is to identify the key success factors of kaizen implementation, as well as the most important benefits of its application, in companies in transition and in developing ...economies. Identified critical success factors are; initiating and evaluating changes and employees' ideas, management and employee support, building an adequate evaluation system, developing internal communication system, and strategic orientation of employees to change. The most important benefits of kaizen implementation are employee empowerment, employee development, and improvement of company performance. Results should improve practice and enable more efficient general management and engineering management of future kaizen implementation processes.
This paper presents a control strategy for residential battery energy storage systems, which is aware of volatile electricity markets and uncertain daily cycling loads. The economic benefits of ...energy trading for prosumers are achieved through a novel modification of a conventional model predictive control (MPC). The proposed control strategy guarantees an optimal global solution for the applied control action. A new cost function is introduced to model the effects of volatility on customer benefits more effectively. Specifically, the newly presented cost function models a probabilistic relation between the power exchanged with the grid, the net load, and the electricity market. The probabilistic calculation of the cost function shows the dependence on the mathematical expectation of market price and net load. Computational techniques for calculating this value are presented. The proposed strategy differs from the stochastic and robust MPC in that the cost is calculated across the market price and net load variations rather than across model constraints and parameter variations.
•The numerical analysis of SAR and temperature distribution within a child head.•Determination of SAR and increasing of temperature within biological tissues.•Dependence of the SAR and temperature ...values on the distance.•Comparison of results obtained by numerical calculation with experimental results.
This paper represents the numerical analysis of Specific Absorption Rate (SAR) and temperature distribution within a real child head model exposed to mobile phone radiation at the frequency of f=900MHz. In this research the SAR and temperature distribution are obtained by numerical solutions of the equation of electromagnetic waves propagation and by bioheat equation, respectively, and are shown inside different biological tissues and organs during exposure to electromagnetic radiation from a mobile phone. As electromagnetic properties of tissues depend on the electromagnetic waves frequency, the value of SAR and temperature will be different for different tissues and organs. The maximum absorption of electromagnetic energy is in the surface layers of the model, whereby this value is greater than the maximum allowed value defined by standards. Furthermore, the increase in temperature is the highest in those biological tissues and organs that are closest to the source of radiation i.e. a mobile phone. Moving away from a mobile phone, the temperature decreases, but more slowly than the SAR values. In the analysis of the temperature rise resulting from tissues and organs heating due to the effects of electromagnetic fields on a child’s head, special attention will be given to the maximum temperature increase in the brain.
Fraud is linked to economic and financial pressures that force people to commit it. Any fraud, regardless of the gender and age of the fraud perpetrators, inevitably leaves a short-term or long-term ...negative mark on society's economy. Many financial frauds in the past (Enron, WorldCom, Parmalat) have left profound negative consequences on global financial markets. Such 'financial strikes' on the financial markets led to financial losses of many companies (not only those in which frauds were committed), the dismissal of many workers, and even the bankruptcy of companies. Successful detection and prevention of fraud imply the harmonious and efficient operation of several factors. One of them understands people's attitudes towards fraud. It is necessary to understand what motivates an individual to commit fraud and the conditions under which someone would commit fraud. Plenty of resources and time have been invested in understanding the motives for adult fraud, i.e., mature people. Experience has shown that it is much more challenging to educate people of that era about the harmful effects of fraud and thus convince them not to commit fraud. For these reasons, the subject of this paper is the consideration of the attitudes of the younger population towards fraud in Serbia. More precisely, the paper discusses the attitudes of young people aged 18 to 30 regarding motives, pressures, and opportunities to commit fraud, participate in corruption, or offer bribes. The main objective is to indicate the tendency of young people to participate in fraud and examine whether respondents' gender influences their willingness to participate in fraud. The research results suggest that, according to young people, the main motive why someone would participate in fraud is financial gain and that young people would participate in fraud only if they could get medical intervention sooner. They also believe that fraud is most prevalent in public administration and that men are more prone to fraud than women, but that the influence of gender is very small.
Abstract Amid the COVID-19 pandemic, teachers globally transitioned to distance learning, presenting significant challenges, particularly in developing countries. In that sense, the study ...investigates the usefulness and satisfaction (US) of distance learning (DL) among accounting students in Serbian public universities during the COVID-19 pandemic. The research focuses on three key factors affecting perceived US derived from existing literature, including teaching process quality (TPQ), technical qualities of distance learning platforms (TQ), and compatibility with social and pandemic conditions (CSPC). The developed theoretical model is predominantly based on the user satisfaction model. Data from 373 surveyed students, gathered through a validated questionnaire, underwent analysis using the partial least squares structural equation model (PLS-SEM). Results reveal that CSPC and TPQ significantly impact the US, whereas TQ has a minor and statistically insignificant effect. The R 2 value indicates these three constructs explain a significant portion of the variance for the US, with moderate effects of CSPC and TPQ and a small effect of TQ, indicated by f 2 values. Moreover, the model is found to be significantly predictive, according to the Q 2 value. Besides theoretical implications, the study suggests important practical implications for university management, emphasizing regular student surveys, continuous improvement of DL systems, and effective and continuous teacher training as the vital measures for enhancing teaching quality. Improving TPQ and TQ also impacts the Serbian economy by fostering workforce development, enhancing digital transformation, stimulating telecommunication industry growth, driving digital information sector development, attracting investment and innovation, boosting global competitiveness, and promoting lifelong learning.
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