Journal of Electrical Engineering and Information Technologies

Undercover

Aleksandra Krkoleva — 2024-12-17

Undercover

Impresum

Aleksandra Krkoleva — 2024-12-17

Impresum

Aleksandra Krkoleva — 2024-12-17

Table of contents

221. LUMINESCENCE PROPERTIES AND APPLICABILITY OF TABLE SALT AS AN ACCIDENT DOSIMETER IN RADIOLOGICAL EMERGENCIES

Aleksandar Krleski — 2024-12-17

In the event of a nuclear incident, it is important to assess the population's exposure thereto at individual level. In retrospective dosimetry, the absorbed dose is determined from materials that have wide application in everyday life. In the early stages after the accident, results obtained with retrospective dosimetry methods are used for triage and allow actions taken to focus on places where they are most needed, that is, they serve as support for making strategic decisions of action. Dosimetric data, in addition to assessment of individual doses, can also be used to assess long-term effects, as well as to improve epidemiological analyses. Materials suitable for examination with luminescent techniques are electronic components, building materials from which quartz can be isolated, porcelain, or dental ceramics.
Crystals characterized by good response to optically or thermally stimulated luminescence and widely distributed in the environment are very useful in retrospective dosimetry for dose estimates in nuclear incidents. When exposed to ionizing radiation, common salt, mainly comprised of NaCl, is a material that exhibits significantly greater luminescence than many other materials. The aim of this study is to investigate thermoluminescence (TL) and optically stimulated luminescence (OSL) characteristics of commercially available table salt.
A protocol for measuring luminescent properties in materials for retrospective dosimetry was applied. Both irradiated and nonirradiated samples showed satisfactory TL/OSL responses. A linear dose response was observed, identifying the material as suitable for retrospective dosimetry. Preheating and reading temperatures were determined, and the SAR method yielded highly accurate dose measurements.

222. THE IMPACT OF HIGH ORDER HARMONICS OF SUPPLY VOLTAGE ON OPERATING CHARACTERISTICS OF INDUCTION MOTORS

Ivan Temelkovski — 2024-12-17

This paper considers the impact of high order harmonics on efficiency, power factor (PF), stator current, and electromagnetic torque developed by a three-phase induction cage motor. In that regard, three cases are examined in detail: the first - when the induction motor is connected to sinusoidal voltage, the second - when the induction motor is connected to voltage that contains high order harmonics (second and third order) despite the fundamental harmonic, and the third - when the induction motor is connected to voltage that contains both, i.e. fundamental and third order harmonic. Based on the simulation created in the Matlab SIMULINK programming and numeric platform, an analysis was made of each of the three cases, clearly highlighting the differences observed.
The main aim of this paper is to make a comparison and estimate the error that could be made by neglecting the presence of one of the supply voltage high order harmonics for the induction motor, as well as to highlight the importance of taking these harmonics into account in calculations for operating characteristics of induction machines.

223. MITIGATING AIR POLLUTION IN NORTH MACEDONIA: THE ROLE OF POWER ELECTRONICS IN ENERGY GENERATION AND CONSUMPTION

Slobodan Mirčevski — 2024-12-17

Environmental pollution and global warming are the greatest world problems today. Climate change and global warming (1.4 ̊C in 2023) as an issue of human survival on the planet Earth are a direct consequence of pollution. Environmental pollution should be divided into air pollution, water pollution, and soil contamination. This paper considers only air pollution in the Republic of North Macedonia and possible solutions thereto. All pollution types are a result of human habits, industrialization and the need for energy sources. Although the greatest environmental pollution comes from developed countries, the most polluted towns are easily found in underdeveloped countries, mainly as a result of poor standards, inadequate heating, and traffic using old buses, cars, etc. The impact of power electronics in industrialization and energy generation is very significant, and therefore it could be equally important for finding a solution to the problem. Power electronics are necessary not only for classical types of power plants (coal, hydro, oil, gas, and nuclear), but even more for renewable power sources such as wind farms, small hydropower plants, and solar plants. The industry is the greatest consumer of electricity, with electric drives accounting for two thirds of that consumption. Households are the second biggest consumer of electricity, with electric drives such as air conditioners and other HVAC (Heating, Ventilation, Air Conditioning) systems, washing machines, refrigerators, dust cleaners, and auxiliary domestic tools having a dominant share. Power electronics is a structure block of any contemporary electric drive and the best way to improve energy efficiency and reduce electricity consumption. On the other hand, they imply less need for electricity. Electric transport is a powerful way to reduce CO 2 emissions. High power fans with filters are necessary for air cleaning at power plants and industrial facilities. Water cleaning is done with the help of purification stations with pumps. In all these cases, power electronics for variable speed drives are used. High-efficiency motors (HEM) are already in use and contribute to lower electricity consumption.

224. COMPARISON OF LORAWAN AND MOBILE IOT NETWORKS AND SERVICES

Hristijan Slavkoski — 2024-12-17

The Internet of Things (IoT) is transforming the telecom world by introducing billions of low power devices each day since the start decade of this century. Massive IoT deployments are provided by using mobile IoT technologies in 4G, 5G and beyond. On the other side, there are widespread non-cellular or non-mobile IoT solutions such as LoRaWAN that provide long-range, lowpower solution in areas with limited mobile coverage. As more low power and low demanding IoT devices connect to the global Internet, choosing the right network technology for their connectivity is becoming increasingly important. Thus, this paper compares LoRaWAN, used for wide-area networks connecting low power devices, and mobile IoT technologies like Narrowband IoT (NB-IoT) and LTE-M. We compare how these technologies handle data, their battery life, how fast they send data, how many devices they can support, how much data they can handle, and how far their network can reach. This paper contributes to being able to decide which technology is best for different IoT scenarios.

225. SURVEY ON TECHNICAL, BUSINESS AND REGULATORY ASPECTS OF ARTIFICIAL INTELLIGENCE IN TELECOM NETWORKS AND SERVICES

Dimitar Tanevski — 2024-12-17

The advancement of AI/ML models, along with the complexity of new-generation networks, including IMT-2020, has made AI functionality indispensable in telecom architecture and business strategies. Standardization bodies such as ETSI and ITU-T have established the foundation for architectural frameworks, with ITU-T Y.3172 and ETSI’s ENI models, leading to various recommendations and supplementary documents covering internal communication, quality of service, fault and recovery, and security frameworks and procedures. Globally, regulatory efforts surrounding AI in telecom, such as the EU's Artificial Intelligence (AI) Act and initiatives from the U.S. and China, emphasize risk categorization, fines for non-compliance, and ethical principles to ensure responsible deployment. Industry collaborations, exemplified by Nokia and NVIDIA's partnership for tech efficiency, and the deployment of AI-driven chatbots by telecom giants like AT&T, Deutsche Telekom, and Vodafone, highlight tangible benefits such as reduced costs, improved performance, and enhanced customer experience. These advancements not only drive down CAPEX and OPEX but also fuel revenue growth and bolster customer satisfaction, underscoring the transformative impact of AI in telecommunications

INSTRUCTIONS FOR AUTHORS

Aleksandra Krkoleva — 2024-12-17

INSTRUCTIONS FOR AUTHORS