Електротехнички факултет [Конференције] / Faculty of Electrical Engineering [Conference paper]

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A Custom Internet of Things Healthcare System
(2015) Vujović, Vladimir; Maksimović, Mirjana; Perišić, Branko
Health is the fundamental capability humans require to perceive, feel, and act effectively, and as such, it represents a primary element in the development of the individual, but also of the environment humans belongs to. That is why it is necessary to provide adequate ways and means to ensure the appropriate healthcare delivery based on parameters monitoring and direct providing of the medical assistance. The new technologies development and implementation, especially the Internet and Wireless Sensor Networks (WSNs) commonly known as the Internet of Things (IoT), enable global approach to the health care system infrastructure development. This leads to e-health system that, in real time manner, supplies a valuable set of information relevant to all of the stakeholders (patients, medical and paramedical stuff, and health insurance) regardless their current location. Commercial systems in this area usually do not meet the general patient needs, and those that do are usually economically unacceptable due to the high operational and development costs. In this paper, based on well-known low-cost technologies, there is a Do-It-Yourself (DIY) solution for a sustainable and adaptable patient oriented infrastructure development, presented.
A Graphical Editor for RESTful Sensor Web Networks Modeling
(2014) Vujović, Vladimir; Maksimović, Mirjana; Perišić, Branko; Milošević, Vladimir
Effectiveness of communication is measured by speed, ease, and accuracy in which the information can be understood. From the cognitive aspect graphical presentations are usually more effective than textual ones, especially when communication between end-users and/or domain practitioners is concerned. Model-Driven Engineering (MDE) graphical tools have become extremely popular concerning the development of applications for a large number of domains. In this paper the emphasis is put on the design and implementation of Graphical Editor for RESTful Sensor Web Network in order to equip designers, with no expert knowledge in specific solution-domain, with a tool that would enable them to easily define tasks, specify network architecture and implement RESTful services. Based on the pilot sensor network design model, the verification, validation and proper functionality of proposed Graphical Editor are performed.
A Low Cost Internet of Things Solution for Traceability and Monitoring Food Safety During Transportation
(2015) Maksimović, Mirjana; Vujović, Vladimir; Omanović-Mikličanin, Enisa
In the last decade, we are faced with a dozen food crisis, which have impact on human health. EU as response to food contamination applies a set of laws and standards for food traceability through all stages of production, processing and distribution, forcing that all food and feed operators implement special traceability systems. One of the main and a crucial element of this system is food transport from manufacturer to consumer, and possibility for monitoring food quality through the transportation process. Applying new technologies, like Internet of Things (IoT), nowadays it is possible to connect food producers, transportation and hospitality/retail companies. A low cost solution based on IoT for real-time food tracebility and monitoring in food transportation process is presented in this paper.
A Proposition of Low Cost Sensor Web Implementation Based on GSM/GPRS Services
(2015) Vujović, Vladimir; Maksimović, Mirjana; Perišić, Branko; Milošević, Goran
In past few years, automatic remote systems for monitoring a wide range of environment or process parameters have exposed a rapid growth concerning the technology issues. Entering the era of Internet of Things (IoTs), a highly dynamic and radically distributed networked system, usage of small, cheap, flexible and end-user programmable computer hardware becomes apparent. These objects, deployed in various environments, are able to communicate and to interact among themselves, with end-users or other entities in the network. Using such objects, tasks like monitoring, control or data processing can be easily done. But, in some case, the target environments are often too dangerous, hazardous, unwired, or difficult to access. In such unfriendly environments there are many challenges for monitoring systems (wireless sensor networks) deployment and maintenance. As the possible solution, in this paper we have suggested the creation of an economical remote monitoring system, based on cheap computer board (Raspberry Pi), wireless sensors and GSM/GPRS (Global System for Mobile Communications/General packet radio service). In other words, the Raspberry Pi platform is utilized as central processing unit which provides a set of services for accessing sensor data, and communicates with end users, while different types of sensors (depending of target parameters) can constitute the detection module. 3G/4G USB Modem or GSM/GPRS shields can be used as GSM/GPRS communication module in order to ensure Internet connection. A whole system presents an IoT solution, precisely a Sensor Web node, which can be accessed all over the world, and provide information from a monitored environment. Performed research shows a possibility of setting up this system for a remote communication, control function and monitoring in unfriendly environments. The usage of low cost pieces of hardware verifies that the Raspberry Pi is highly suitable for numerous IoT concept applications and especially in the unfriendly environments.
Adaptive Delay Bank Filter for Selective Elimination of harmonics in SRF-PLL structures
(2015) Lubura, Slobodan; Šoja, Milomir; Lale, Srđan; Ristović, Milica; Ikić. Marko
This paper proposes the usage of adaptive delay bank (ADB) based on cascaded delayed signal cancellation (CDSC) structure for selective elimination of the harmonics in the synchronous reference frame phase locked loop (SRF-PLL) structures. The ADB is inserted inside the SRF-PLL structure and it is frequency adaptive, which is the advantage over CDSC structures which are used in PLL as pre-filters, not being adaptive at all. Detailed mathematical analysis and simulation results confirmed suggested method for selective harmonic elimination in PLL.
An Improved Version of Student Attendance Management System Based on RFID
(Faculty of Electrical Engineering, University of East Sarajevo, 2019) Mijić, Danijel; Bjelica, Ognjen; Durutović, Jelena; Ljubojević, Miloš
Student attendance registration is one of the routine but time-consuming tasks of teaching staff at higher education institutions. Various technical solutions are implemented to alleviate the administrative burden and partly automate this task. Most of them include the use of one or more of the following - Radio Frequency Identification (RFID) technology, biometric solutions such as fingerprint and face recognition and mobile devices - mostly smartphones. In this paper, we present an improved version of our system based on RFID and some results of its use in a real environment. The main improvements have been made to a hardware component RFID reader and to a web-based application that is used by the faculty staff. Besides the usual features of similar systems related to student attendance, the system also includes features that enable integration with external systems, recording of necessary data regarding the work of teachers in class and generating of periodical reports on their work.
Analysis of discretization methods applied on DCSOGI block as part of SRF-PLL structure
(2016) Ristović Krstić, Milica; Lubura, Slobodan; Lale, Srđan; Šoja, Milomir; Ikić. Marko; Milovanović, Dragiša
Phase Locked Loop (PLL) is wide used for grid parameters estimation, as well for grid-converters synchronization. Key block at single-phase Synchronous Reference Frame PLL (SRF-PLL) structure is two-phase generator which is used for generation of two quadrature signals, which are necessary for SRF block. One of the issues that could appear during estimation of grid parameters is appearance of DC offset in measured grid voltage. In this paper is described second order generalized integrator (SOGI) which is capable to fully reject DC offset and noise which could appear in measured input grid voltage. This two-phase generator is named DC-SOGI. Analog DC-SOGI is made of two second order filters. While these structures are mostly digitally implemented, then it is interesting to analyze discretization method and sampling time impact on two-phase generator. Simulation results confirm given assumption.
Analysis of single-phase PLL with novel two-phase generator for gridconnected converters
(2011) Lale, Srdjan; Lubura, Slobodan; Šoja, Milomir; Ikić. Marko
It is very important for proper work of gridconnected converters to have accurate detection of phase angle, frequency and amplitude of grid voltage. Estimation of these grid parameters can be achieved using PLL (phase locked loop) based on SRF (synchronous reference frame) theory. This PLL should have robustness against noise and offset introduced by measurement and data conversion. This paper proposes an improved PLL alorithm that has excellent noise and offset rejection property. The main part of the proposed PLL is a novel two-phase generator which is used to obtain two quadrature signals for SRF block and PI regulator in closed control loop.
Analyzing the Еffects of Мobility and Season on COVID-19 Cases Using Negative Binomial Regression: a European Case Study
(Faculty of Electrical Engineering, University of East Sarajevo, 2021) Janković, Radmila; Amelio, Alessia; Ćosović, Marijana
This paper develops a Generalized Linear Model using the Negative Binomial Regression with log link function to analyze the effects of mobility trends and seasons on COVID-19 cases. The data of four European countries was used, namely Austria, Greece, Italy, and Czech Republic. The dataset includes daily observations of registered COVID-19 cases, and the data of six types of mobility trends: retail and recreation, grocery and pharmacy, parks, transit stations, workplaces, and residential mobility for the period Feb 15 - Nov 15, 2020. The results suggest that the number of COVID-19 cases differs between seasons and different mobility trends.
Application of Game-Based Learning in Cultural Heritage
(2020) Cosović, Marijana; Ramic-Brkić, Belma
Although the end of Moore's law has been predicted for many years, the capacity to store information in information and communication technology is still progressing in ways we could not imagine. Hence, the museum environments are also bene ting from improvements in data collection, storage and processing as well as allowing the great body of information within cultural heritage domain to be applied through interesting processes in the museums, one of which is game-based learning. Although, concept of employing games in the learning process is known for a long-time research teams in game-based learning and in the CH eld in general often lack uni ed approach with results that are ex- tended globally and team effort contributing to a larger systematically organized body of knowledge. In this paper we identify advantages and disadvantages of game-based learning application in the museums. By doing this we attempt to tackle promotion of cultural heritage, raise awareness of its importance and motivate users to visit cultural institutions such as museums more often.
Aspects of remote monitoring and recording system of non-ionizing electromagnetic radiation
(2015) Šuka, D. S.; Simić, M. I.; Pejović, P. V.
The paper discusses the possibilities and aspects of continuous, remote monitoring system of non-ionizing electromagnetic radiation using certain networks for measuring and storage of measurement results. First are stated the motives for the usage and installation of such networks and preliminary activities necessary for the proper design of systems, as well. Further, the system architecture and methodology of such measurements are described, where defined requirements are placed in front of the remote monitoring station. Control of measurements is achieved from a remote distance via GSM, GPRS or other telecommunication services. Such systems allow full control of remote monitoring stations, as well as continuous recording of all measurement results. Measurement results from all monitoring stations are collected in control centre, where a comprehensive analysis of all measurement data can be done and published on certain website afterwards.
Classication Methods in Cultural Heritage
(Research Area of the CNR of Pisa Institute of Information Science and Technologies “A. Faedo” (ISTI), 2019) Ćosović, Marijana; Amelio, Alessia; Junuz, Emina
This paper describes relevant classifi cation methods applied to the cultural heritage context. In particular, a categorisation of the classifi cation methods is provided according to tangible and intangible cultural heritage, where movable and immovable objects can be in the focus. A short description of each method is reported for each cultural heritage category in terms of feature representation, classifi cation approach and obtained results. The proposed survey can be useful in the research community of pattern recognition and visual computing for exploring the current literature about the topic. It will hopefully provide new insights for the advancement of knowledge discovery in cultural heritage.
CNN Classification of the Cultural Heritage Images
(Faculty of Electrical Engineering, University of East Sarajevo, 2020) Ćosović, Marijana; Janković, Radmila
The cultural heritage image classification represents one of the most important tasks in the process of digitalization. In this paper, a deep learning neural network was applied in order to classify images of architectural heritage belonging to ten categories, in particular: (i) bell tower, (ii) stained glass, (iii) vault, (iv) column, (v) outer dome, (vi) altar, (vii) apse, (viii) inner dome, (ix) flying buttress, and (x) gargoyle. The Convolutional neural network was used for image classification, with the same architecture applied on two sets of the data: the full dataset consisting of 10 categories as well as dataset with 5 different image categories. The results show that both architectures performed well and obtained accuracy of up to 90%.
Determination of Normative Value Power Losses in Distribution power grids with Renewable Energy Sources using Criterion Method
(Faculty of Electrical Engineering, University of East Sarajevo, 2020) Gundebommu, Sree Lakshmi; Cosovic, Marijana; Rubanenko, Olena
The paper presents the possibility of using criterion programming and neuro-fuzzy modeling in determining the value of planning technical power losses. Proposed is an optimal control in normal mode power grids which considers the value of planned technical power losses. Improved method for determining normative values of technical energy losses using the criteria programming and neuro-fuzzy modeling is presented.
Evaluating the optimal heat detector deployment for fire detection
(2014) Maksimović, Mirjana; Vujović, Vladimir; Perišić, Branko; Milošević, Vladimir
Wireless Sensor Networks (WSNs), composed of spatially distributed autonomous sensor nodes, have a wide range of application. One of the most interesting phenomena that can be monitored by WSN, among various physical, chemical and biological phenomena and different kind of events, is fire. In case of fire presence continuous monitoring and/or recording of sensitive or restricted parts are necessary for timely response and reaction. Fire monitoring applications require accurate deployment of the sensor nodes because their positions have a dramatic impact on the effectiveness of the WSN and the efficiency of its operation. The choice of the deployment scheme depends highly on the type of sensors, application and the environment that the sensors will operate in (residential buildings, hospitals, historical buildings, malls etc.). The main advantage of WSN usage can be also identified as a simple reconfiguration and maintenance of the created infrastructure, what can be of great importance for systems that are physically unaffected by changes, but they tend to change in terms of safety (e.g. ships, oil productive platforms, etc.). Knowing that the positions of nodes have a dramatic impact on the effectiveness of the WSN and the efficiency of its operation, in this paper the various strategies for positioning nodes in WSNs are considered: grid, triangular and strip. The objective of this paper is to properly place the heat detectors in certain indoor area, in such way that next two important network design objectives are satisfied: to maximize the network lifetime after fire ignition and to use a minimum number of sensors in order to achieve full area coverage.
Experimental verification of single-phase PLL with novel two-phase generator for gridconnected converters
(2012) Lubura, Slobodan; Šoja, Milomir; Lale, Srđan; Ikić. Marko
For proper work of grid-connected converters it is important to have accurate detection of phase angle, frequency and amplitude of grid voltage. Estimation of these grid parameters can be achieved using PLL (phase locked loop) based on SRF (synchronous reference frame) theory. This PLL should have robustness against noise and offset introduced by measurement and data conversion. This paper proposes an improved PLL algorithm that has excellent noise and offset rejection property. The main part of proposed PLL is a novel two-phase generator which is used to obtain two quadrature signals for SRF block and PI regulator in closed control loop. Performances of proposed PLL are verified through experimental results given in this paper.
Implementation of CORDIC Algorithm on FPGA Altera Cyclone
(2012) Ristović, Milica; Lubura, Slobodan; Jokić, Dejan
In paper is presented HDL Code generation of Cordic Algorithm in MATLAB/Simulink, using HDL Code generation tool, and its implementation on FPGA Altera Cyclone, using Altera Quartus II. There are also tested data types which Cordic uses, as well as time which is need for sine or cosine calculation of given angle, depending on these data types. With this information Cordic can be easily implemented in any digital system.
Improving computing issues in Internet of Things driven e-health systems
(2017) Maksimović, Mirjana
The Internet of Things (IoT) progress shows a positive influence on all aspects of healthcare. Enabling access to high-quality healthcare to anyone, from anywhere are the main advantages of the IoT-driven e-health systems. Increasing numbers of medical devices and sensors and 24/7 monitoring of health parameters, consequently lead to enormous quantities and varieties of data. Having in mind the amounts of generated data and importance of on-time diagnosis and decision making as well as a significance of fast reactions in a case of detected abnormalities, transmitting all data to the Cloud for analysis may not be appropriate. For that reason, implementing a Fog computing, which realizes mini analytic processing centers at the edge of the network, appears as a better approach. This paper analyzes the manners and benefits of implementing Fog computing in the IoT-driven e-health systems. It is expected that the IoT and Fog computing together will revolutionize healthcare like nothing else before.
MasterBroker: REST oriented Service Broker
(2014) Kosmajac, Dijana; Vujović, Vladimir; Maksimović, Mirjana; Davidović, Nikola; Perišić, Branko
Considering historical development and expansion of World Wide Web, it is obvious that there is no unique tendency in terms of supporting software technologies. Moreover, vast amount of different technologies has emerged because the system as a whole became quite complex and diverse. Heterogeneity, which is characteristic of distributed systems based on Web, is one of the main challenges which system designer may encounter. The paper presents and discusses a software solution proposal which mainly relies on widely deployed Internet stack protocols and REST (Representational State Transfer) style of Web services. Further, the paper compares standardized approach based on SOAP (Simple Object Access Protocol) to a proposed one based on REST. As a result, the implementation represents a control component with broker architecture
Novel Band-Pass and Notch filter with Dynamic Damping of Fractional Order
(2017) Bošković, Marko; Šekara, Tomislav B.; Rapaić, Milan R.; Lutovac, Budimir; Daković, Miloš; Govedarica, Vidan
The paper introduces a novel the second order band-pass and notch filter with dynamic damping factor βd of fractional order. Indeed, the factor βd has a form of fractional differentiator of order α, i.e. βd=β/s α, where β and α are adjustable parameters. Shaping of the frequency response enables achieving better phase response compared to the integer-order counterparts which is of great concern in many applications. The aim of the paper is to exploit an extra degree of freedoms of presented filters to achieve the desired filter specifications and obtain desired response in the frequency and the time domain.

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