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Accuracy of Rotational Speed and Torque Sensors for Determining the Mechanical Power of Rotating Electrical Machines
Gregor Srpčič, Iztok Brinovar, Bojan Štumberger, Sebastijan Seme, Miralem Hadžiselimović, 2019, published scientific conference contribution

Abstract: This paper deals with determining the accuracy of measuring systems for determining the characteristics of rotating electrical machines. Efficiency classes and experimental methods for determining efficiency, are given in a standard, which has to be strictly respected. For determining the efficiency of an electrical machine, it is necessary to have a modern and accurate measurement system with sensors of high accuracy classes, which enables the user to carry out precise measurements and consequently, to determine all the characteristics of the electrical machine. This paper will be focused on torque and speed measurements.
Keywords: efficiency, measuring system, electric machines, torque and rotational sensors, accuracy
Published in DKUM: 04.12.2023; Views: 288; Downloads: 12
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Design influenced by the effect of filter selection on the appraiser variation of the measuring results of a 3D optical measuring system
Josip Groš, Tihomir Mihalić, Srđan Medić, Nikola Šimunić, 2020, original scientific article

Abstract: During the previous decade, 3D optical measuring systems have had an increasing application regarding quality control in different industrial branches where they are commonly used to monitor parts made from sheets, polymers, and castings. The biggest disadvantage of 3D measuring devices is the lack of ISO standards for the calibration of such devices, making it difficult to estimate the quality of the measuring results. The introductory part of the present paper elaborates the working principle of the 3D optical measuring system. In this paper, the free software package GOM inspect is used. When marking the geometric features of the measured metering object, GOM inspects different filters for the selection of the aforementioned features. The experimental part of the paper elaborates the influence of usage of different filters (Gaussian best fit, Chebyshev best-fit, Minimum circumscribed element and Maximum inscribed element) on the measuring results. Reference results are measurements performed on a device with a higher level of accuracy (coordinate measuring device). Afterwards, a comparison of the reference results and measures performed with 3D optical measuring systems using different filters was made.
Keywords: 3D optical measuring systems, Gaussian best fit, Chebyshev best-fit, minimum circumscribed element, maximum inscribed element
Published in DKUM: 01.12.2023; Views: 265; Downloads: 5
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Experimental validation of a thermo-electric model of the photovoltaic module under outdoor conditions
Klemen Sredenšek, Bojan Štumberger, Miralem Hadžiselimović, Sebastijan Seme, Klemen Deželak, 2021, original scientific article

Abstract: An operating temperature of the photovoltaic (PV) module greatly affects performance and its lifetime. Therefore, it is essential to evaluate operating temperature of the photovoltaic module in different weather conditions and how it affects its performance. The primary objective of this paper is to present a dynamic thermo-electric model for determining the temperature and output power of the photovoltaic module. The presented model is validated with field measurement at the Institute of Energy Technology, Faculty of Energy Technology, University of Maribor, Slovenia. The presented model was compared with other models in different weather conditions, such as clear, cloudy and overcast. The evaluation was performed for the operating temperature and output power of the photovoltaic module using Root-Mean-Square-Error (RMSE) and Mean-Absolute-Error (MAE). The average RMSE and MAE values are 1.75C and 1.14C for the thermal part and 20.34 W and 10.97 W for the electrical part.
Keywords: dynamic modeling, thermo-electric model, accuracy, measuring device, temperature, output power, PV module
Published in DKUM: 13.11.2023; Views: 232; Downloads: 11
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Measurement device for testing printed circuit board assemblies coming off the production line
Nejc Friškovec, Manja Obreza, Sebastijan Seme, Klemen Sredenšek, 2022, original scientific article

Abstract: The paper presents an efficient way to evaluate and determine the quality of an assembled printed circuit board coming off the production line. A printed circuit board assembly consists of electronic devices soldered to the printed circuit board, which provides the electrical connections. After assembling the printed circuit board, a function test needs to be performed to guarantee the quality of the product. Usually, the assembly lines are equipped with cameras that detect inaccuracies such as missing components. This level of quality assurance is sometimes not enough, and we need to add another degree of precaution. In addition to camera inspections, electronic measurements must be conducted. The process needs to be automated to provide repeatability and speed. The paper evaluates such a device and presents its advantages, disadvantages, and complexity. The device includes an electrical part that performs the measurements, a mechanical part that consists of a housing and a mounting nest, and a program that supervises the process.
Keywords: electrical measurement, printed circuit board, testing device, automation, intelligent measuring system
Published in DKUM: 30.10.2023; Views: 225; Downloads: 5
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Corporate governance of slovenian and german telecommunications companies
Natalija Pauman, 2019, master's thesis

Abstract: In the master’s thesis we researched corporate governance and the quality of corporate governance. Corporate governance and management of organizations stem from the need and the desire for the existence and development of an organization. It is necessary to establish certain kind of monitoring and controlling in organizations, which we define with the term “corporate governance”. Corporate governance is the system of regulating and controlling corporate conduct and of balancing interests of all shareholders and other stakeholders to which company has influence. The interests of directors and shareholders may be in contrast. The purpose of corporate governance is to find a way to satisfy the interest of both, the board of directors and the shareholders, and at the same time to create long-team and sustainable growth for the company. Corporate governance is extremely important for individual organizations and, consequently, for their business. Compering different organizations, their corporate governance is done in different ways. Corporate governance in developed countries and leading economies is certainly different than in smaller and less developed countries. In this case, arises a question what kind of corporate governance can be labelled as “good” or “first-class” corporate governance. In order to improve corporate governance practices, various legal regulations and other forms of binding and less binding rules, recommendations, codes and standards have been developed. Quality is extremely important for organizations, therefore several methods, methodologies and indexes for measuring the quality of corporate governance have been developed. The purpose of methods is to evaluate and compare the quality of corporate governance between individual companies and between different countries. The results can serve for developing measures to improve corporate governance practices. At the same time, findings can serve to modify and supplement existing legislation and recommendations. The corporate governance index, as a measure of the quality of corporate governance processes, can also be one of the important indicators of the company's potential in order to access to new sources of capital and to reduce the capital´s costs in comparison with other companies. The main purpose of the master's thesis is to study corporate governance and its impact on the business of Slovenian and German telecommunication companies. We make comparison between following companies: Telekom Slovenije, d.d., A1 Slovenija, d.d., Deutsche Telekom AG and Telefónica Deutschland Holding AG. The quality of corporate governance in selected companies was measured with the SEECGAN methodology and index. The methodology was designed to measure the quality of corporate governance. It ensures transparency and provides a structured overview of the main areas of corporate governance between different companies. In empirical part of master’s thesis, we found out that Telekom Slovenije, d.d. has "first-class" quality of corporate governance, A1 Slovenia, d.d. has a "good" quality of corporate governance, Deutsche Telekom AG has a "first-class" quality of corporate governance and Telefónica Deutschland Holding AG has a "good" quality of corporate governance. We found out that both countries have companies with “first-class” and “good” corporate governance. The quality of corporate governance is not related to the national origin or country of operation of the company. One of the main finding of the analysis is that there are no significant differences between the quality of corporate governance in specific areas of SEECGAN index in Slovenian and German companies.
Keywords: corporate governance, quality of corporate governance, telecommunication companies, public stock companies, SEECGAN index and methodology, measuring the quality of corporate governance
Published in DKUM: 24.10.2019; Views: 1048; Downloads: 105
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The role of logistics in performance management
Mimo Drašković, 2016, independent scientific component part or a chapter in a monograph

Abstract: Apart from the proven and significant role of logistics in integrating marketing and management systems of a company, the position on the connection between the logistics and institutional (top) level of a business strategy in contemporary literature and business practice is being acknowledged. The mentioned position implies the implementation of performance management. In this way, the earlier opinion and praxis of connecting logistics with operations and provisional functioning in the area concerning a degree of integrations of business functions are being surpassed. The relationship between performance management and logistics can be considered from two aspects: a) role of logistics in enhancement of performance management and b) roles of measuring and analysis in enhancing the logistics performances themselves. This paper explains the mentioned dual relationship through the prism of acquirement of key competences and competitive advantages of an organization through enhancement of certain performances.
Keywords: logistics, performance management, enhancement, measuring, analysis
Published in DKUM: 09.05.2018; Views: 947; Downloads: 84
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The use of the Kano model to enhance costumer satisfaction
Laura Južnik, Mitja Kozar, 2017, original scientific article

Abstract: Background/purpose: The interest of measuring customer satisfaction is reflected in its ability to gain customer loyalty, enhance favourable word of mouth, lead to repeat purchases and improve a company’s market share and profitability. The issue of integrating the Kano model of customer satisfaction with other models and tools to support development or improvement of a product, or to determine market strategies, is relatively unexplored in the Slovenian sector. This research aims to construct the Kano model in order to enhance customer satisfaction in the case of home appliances. Design/Methodology/Approach: Data was collected using an online survey amongst randomly selected individuals from the service interventions for an end users database. Principal component factor analysis was first used to identify the underlying factors of home appliance characteristics. In the next phase we calculated the derived and stated importance of customer satisfaction, which was then used to construct the Kano model of customer satisfaction. We further analysed which factors are the strongest drivers, or predictors, of repeat purchase using multiple regression analysis. Results: In the study we identified the underlying home appliance factors. The results show that these factors are: sales environment, price, user features, design features and technical features. The results were then used to construct the Kano model where the analysis goes beyond the qualitative analysis by implementing two approaches, stated and derived importance approach. According to the Kano model, marketers should concentrate on delight characteristics such as: wider knowledge of the salesperson, professional skills of the salesperson, design of home appliance, brand of home appliance. What is more, factors called ‘user features’ are the strongest predictors of repeat purchase. Conclusion: This paper links the Kano model with measuring customer satisfaction and presents a contribution for marketing research theory. Therefore, the results could be used to support optimization of business decision-making, as well as for further scientific research.
Keywords: optimization, business decisions, Kano model, consumers, satisfaction, measuring satisfaction
Published in DKUM: 23.01.2018; Views: 1416; Downloads: 203
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Techniques of measuring heart rate in cattle
Marjan Janžekovič, Bogomir Muršec, Ignac Janžekovič, 2006, original scientific article

Abstract: The intensive animal breeding systems can cause severe environment degradation. However, the highly productive animals are extremely sensitive to the environmental changes. The animal welfare can be in direct contradiction with the need for highly intensive and economically successful milk production. The research is aimed at complementing the method of establishing the stress in calves, race heifers, fattened cattle and milk-cows with different body masses. Measuring of heart rate is one of painless measurements of physiological parameters of stress and, from the point of view of animals it has many advantages over the measurements including taking of blood samples. For measuring the heart rate of different categories of cattle without interference into their body we have tested the usefulness of special apparatuses used worldwide by top sportsmen during training for following up, measuring and monitoring the heart rate. These are Polar monitors of the heart rate, made by Finnish company Polar Electro Oy and working wirelessly with ECG precision. The receiver counts the heart rate on the basis of pulse-to-pulse time average algorithms in 5, 15 or 60-second intervals. The computer interface ensures magnetic transfer of measured and saved data on animals into a PC where the analysis of each collected data file follows. The used type of transmitter "Polar sport tester profi" having two electrodes in an air-tight sealed frame has enabled us to obtain a good signal on calves of up to 180 kg body mass. Periodic response in case of young cattle of up to 280 kg body mass has been registered only if electrolyte was added between the animal skin and the feeler. By further modifications and tests of the mentioned apparatuses the expected response has been reached also on adult animals. We found that use of these apparatuses on animals did not have any influence on special animal acting behaviour. The production of milk and meat in herds did not change during the test.
Keywords: Polar monitors, modified apparatus, heart rate, cattle, measuring
Published in DKUM: 12.07.2017; Views: 1332; Downloads: 100
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Implementation of EasyTime formal semantics using a LISA compiler generator
Iztok Fister, Marjan Mernik, Iztok Fister, Dejan Hrnčič, 2012, original scientific article

Abstract: A manual measuring time tool in mass sporting competitions would not be imaginable nowadays, because many modern disciplines, such as IRONMAN, last a long-time and, therefore, demand additional reliability. Moreover, automatic timing-devices based on RFID technology, have become cheaper. However, these devices cannot operate as standalone because they need a computer measuring system that is capable of processing incoming events, encoding the results, assigning them to the correct competitor, sorting the results according to theachieved times, and then providing a printout of the results. This article presents the domain-specific language EasyTime, which enables the controlling of an agent by writing the events within a database. It focuses, in particular, on the implementation of EasyTime with a LISA tool that enables the automatic construction of compilers from language specifications, using Attribute Grammars.
Keywords: domain specific modelling language, compiler, code generator, measuring time
Published in DKUM: 06.07.2017; Views: 1543; Downloads: 365
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Measuring information security performance with 10 by 10 model for holistic state evaluation
Igor Bernik, Kaja Prislan Mihelič, 2016, original scientific article

Abstract: Organizations should measure their information security performance if they wish to take the right decisions and develop it in line with their security needs. Since the measurement of information security is generally underdeveloped in practice and many organizations find the existing recommendations too complex, the paper presents a solution in the form of a 10 by 10 information security performance measurement model. The model—ISP 10×10M is composed of ten critical success factors, 100 key performance indicators and 6 performance levels. Its content was devised on the basis of findings presented in the current research studies and standards, while its structure results from an empirical research conducted among information security professionals from Slovenia. Results of the study show that a high level of information security performance is mostly dependent on measures aimed at managing information risks, employees and information sources, while formal and environmental factors have a lesser impact. Experts believe that information security should evolve systematically, where it’s recommended that beginning steps include technical, logical and physical security controls, while advanced activities should relate predominantly strategic management activities. By applying the proposed model, organizations are able to determine the actual level of information security performance based on the weighted indexing technique. In this manner they identify the measures they ought to develop in order to improve the current situation. The ISP 10×10M is a useful tool for conducting internal system evaluations and decision-making. It may also be applied to a larger sample of organizations in order to determine the general state-of-play for research purposes.
Keywords: information security, organizations, efficiency, measuring, security management
Published in DKUM: 19.06.2017; Views: 1698; Downloads: 477
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