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MIPRO 2022 - 45th Jubilee International Convention

CTS - Computers in Technical Systems

Thursday, 5/26/2022 9:00 AM - 1:00 PM, Leut II, Hotel Admiral, Opatija

Hybrid Event

Event program
Thursday, 5/26/2022 9:00 AM - 1:00 PM,
Leut II, Hotel Admiral, Opatija
9:00 AM - 11:00 AMPapers 
1.L. Cvitaš, B. Vuletić Komljen, M. Miletić, T. Špoljarić, G. Malčić (Zagreb University of Applied Sciences, Zagreb, Croatia)
Electronic Unit for Controlling the Operation of the Device with a Flooded Evaporator 
Flooded evaporator is one of the physical ways in which thermal energy can be exchanged between a cooling medium and refrigerated medium, but which is rarely used due to management issues. This paper presents the design of an electronic control unit for controlling the operation of a cooling device based on flooded evaporator technology, and for the purpose of flow cooling juices and beer. Sensor and actuator equipment for control and acceptance of process information is installed on a real laboratory model. The control electronic circuit is designed so that the control of system operation and acceptance of sensor values can be performed via computer program MATLAB Simulink and parallel via an internal application in the microcontroller. The model is equipped with various sensors (temperature, pressure, flow) and actuators (fluid solenoid valves, condenser fan, frequency-controlled compressor) and as a result a microcontroller system was developed as a signal interface between the Simulink acquisition card and the physical model. Experimental methods lead to optimal control and regulation algorithms applicable in the later phase of industrial design of the complete device.
2.N. Šare, B. Vuletić Komljen (Zagreb University of Applied Sciences, Zagreb, Croatia), J. Matuško (Faculty of Electrical Engineering and Computing, Zagreb, Croatia), K. Osman (Zagreb University of Applied Sciences, Zagreb, Croatia)
Control of Flooded Evaporator in a Beer Dispenser Unit 
This paper presents a gain-scheduling controller for a flooded evaporator laboratory plant at Polytechnic of Zagreb. The controller is designed based on a relatively simple linear parameter varying model of the process. For such a model a relatively simple gain scheduling controller has been designed with utilising PI controller and PI controller within Smith predictor control scheme. The designed control systems were verified in Matlab/Simulink environment.
3.N. Šare, B. Vuletić Komljen (Zagreb University of Applied Sciences, Zagreb, Croatia), J. Matuško (Faculty of Electrical Engineering and Computing, Zagreb, Croatia), K. Osman (Zagreb University of Applied Sciences, Zagreb, Croatia)
Modelling and Experimental Verification of Device with a Submerged Evaporator for Beer Cooling 
The paper presents the performance of a theoretical mathematical model of a device with a submerged evaporator for cooling beer. In addition to describing the observed system with all its components, assumptions and simplifications were also introduced into the performance of the model. The mentioned model was derived as a system with distributed parameters of the counter clockwise type. The mathematical model obtained was run in the computer program MATLAB Simulink and a simulation of the response of the observed unit parameters was performed: barrel temperature, beer temperature, condenser pressure, evaporator pressure and beer flow. In addition, experimental measurements (recordings) of the same parameters were made on the laboratory model of the beer cooling device. Finally, a graphical result of both approaches is presented with a comparison. In both cases, the results were obtained for different frequencies of the electric motor of the compressor in the propane refrigeration circuit.
4.D. Cetkovic (Faculty of Engineering, University of Rijeka, Rijeka, Croatia), G. Klobučar (High School of Electrical Engineering and Computing, Rijeka, Croatia), V. Komen (Faculty of Engineering, University of Rijeka, Rijeka, Croatia)
Analysis of the Impact of Reactive Power Compensation on the Electric Power Quality of the LV Consumers in Distribution Networks of Various Characteristics 
In various distribution networks, the usage of capacitor banks can have different effects on voltage conditions and the quality of consumer voltage, depending on factors such as the configuration and parameters of the distribution network, consumers load level, etc. This paper presents an approach that, for different types of networks and different consumer load levels, recommends an approach for reactive power compensation in the distribution network. The approach is based on entering the data on the configuration and parameters of the distribution network and load level conditions for each analyzed network. The optimization algorithm proposes different values for the installed power of the reactive power compensation device. The voltage conditions for different intervals of the day are then calculated. The algorithm then evaluates the proposed compensation solution based on the evaluation of voltage variations on the LV side of the transformer over a period of one day. After a predefined number of iterations, the algorithm ends and proposes a solution for the analyzed case.
5.I. Šolc, P. Makarun, J. Kir Hromatko, Š. Ileš (University of Zagreb Faculty of electrical engineering and computing, Zagreb, Croatia)
Testing Direct Yaw Moment Control Using a Scaled Car and a Roadway Simulator 
This paper describes a direct yaw moment control algorithm which was developed and tested using a frontwheel drive scaled electric car driving on a treadmill. The algorithm generates torque references for each wheel based on the desired yaw rate. The scaled vehicle’s parameters are chosen with the goal of achieving dynamic similitude to a fullsize vehicle using the Buckingham Π theorem. Using a scaled vehicle and a roadway simulator allows for easier deployment and testing of control algorithms for vehicle dynamics.
6.K. Osman (Zagreb University of Applied Sciences, Zagreb, Croatia), K. Špehar (Markoja d.o.o., Zagreb, Croatia)
Implementation of Process Flow Measurements in Pressure Pipelines in a Hydropower Plant 
The paper presents the implementation of process measurements of the volume flow in the penstock of a hydropower plant. Based on this data, the operating performance of the individual units is regulated. Furthermore, defects or cracks in the penstock itself can be detected. Furthermore, the reasons for installing flow metres are described and the applicable standards and regulations are presented. The installation of sensors and control units as well as their parameterisation are shown. Finally, a comparison of the applied flow measurement methods is given with a graphical presentation of the measurement results.
7.D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
Concept for Active Attenuation of Aircraft Rotor Noise Using Ultrasonic Speakers 
Aircraft rotors are sources of high levels of noise. Noise levels produced by helicopters and large drones are a great nuisance in urban areas. The theoretical concept of Active Noise Control (ANC) applied to aircraft rotors is presented. Concept of ANC for a ducted rotor is extended to an open rotor. Later uses ultrasonic arrays placed around the truncated cone as secondary sources of ultrasound beams of high directivity driven by the multichannel control device to diminish noise levels produced by the rotor. Amplitude modulated adjacent ultrasound beams originating from the ultrasonic arrays produce a rotational acoustic field that rotates together with the rotor. Noise cancelation by modulated ultrasound beams directed to the rotor targets the position of the dominant sources of rotor noise, i.e., rotor tips.
8.D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
Aircraft Piston Engine Problem Detection Using CHT-EGT Trajectory 
Modern engine monitors provide vast amounts of data obtained from aircraft piston engines. Most important parameters are Cylinder Head Temperatures (CHTs) and Exhaust Gas Temperatures (EGTs) that are available for each engine cylinder. A CHT-EGT trajectory is formed from successive CHT-EGT pairs present in a CHT-EGT scatter plot. The short term CHT-EGT trajectory captures short term dynamics of engine temperatures and can be used for its visualization. By comparing temperatures of the individual cylinders, under the assumption of similarity of operating temperatures of individual cylinders in a normal engine, abnormalities in engine operation can be detected. The method based on the comparison of short term CHT-EGT trajectories can be used to detect abnormalities during dynamic engine operation. During static engine operation, the CHT-EGT trajectory should shrink to a small area, and this can also be used to detect engine abnormalities.
11:00 AM - 11:30 AMBreak 
11:30 AM - 1:00 PMPapers 
1.M. Saari, M. Nurminen, P. Rantanen (Tampere University, Pori, Finland)
Survey of Component-Based Software Engineering within IoT Development 
The Internet of Things (IoT) is a growing area in everyday life. New applications under the umbrella term IoT are being developed continuously. A typical IoT system consists of quite a large set of interchangeable components. In prototype development the Raspberry Pi and Arduino have become core components of wireless sensor network solutions. This research looks at how component-based software engineering (CBSE) and off-the-shelf components can be taken advantage of when defining IoT systems. We will attempt to identify the common properties of IoT systems and compare how well these properties relate to the CBSE component characteristics: composability, deployability, comprehensive documentation, independence, and standardization. The research methodology used in this study is a literature survey. The main results of the study show that CBSE is not widely used. There has been very little research on the software side of applications, as most studies have focused on describing the hardware side of implementations. The conclusion can be made that, in order for studies to be reproducible, the software side should be described in more detail.
2.J. Zidar, I. Aleksi, T. Matić, D. Žagar (Faculty of Electrical Engineering, Computer Science and Information Technology, Osijek, Croatia)
Comparison of Different Acceleration Sensors for Low Power Vibrations and Shock Detection in Supply Chain 
The supply chain is a large process that is responsible for the delivery of products all around the world. Different hazards can affect the products and cause damage during product delivery, e.g. temperature, moisture, vibrations, etc. Shock and vibrations are common during transporting and handling goods in the supply chain and can cause product failures like breakage, deformation, etc. This paper analyzes the properties of several commercially available acceleration sensors for shock and vibrations detection. A Custom PCB board is developed, and sensors are tested to detect product vibrations and shock in the laboratory environment. Packages can travel long journeys before reaching the set destination. Therefore, power consumption is analyzed for the tested sensors. Presented results show that different acceleration sensors need to be used for vibrations and shock detection in the supply chain.
3.J. Đurić, M. Matijević, A. Mahmutović, M. Ivankić (Visoka škola za informacijske tehnologije Zagreb, Zagreb, Croatia)
Monitoring of Plant Growth Using Soil Moisture and Temperature Sensor and Camera 
The digital revolution has made a significant step forward in the application of information technology in monitoring the changes taking place around us. The Internet of Things is widely used to modernize and optimize agricultural processes. Achieving an ideal model of information technology management in agriculture requires data collection that will ensure an adequate range of impact on agricultural cultures. In this paper, the lifespan of one type of ornamental flower will be monitored by several sensors. Monitoring parameters such as soil moisture and temperature are easily done using various sensors which immediately measure wanted values. Numerous papers report on monitoring and controlling plant growth, but most of them are based only on monitoring values obtained from sensors. Using various sensors and a camera, growers can react promptly and see the change in leaves and/or flowers. Monitoring changes with sensors and camera provides data that helps automate the cultivation of a cultures.
4.E. Simic, M. Begovic (Faculty of Transport and Communications, Sarajevo, Bosnia and Herzegovina)
Airport Delay Prediction Using Machine Learning Regression Models as a Tool for Decision Making Process 
Air traffic has seen a steady increase in the number of operations in recent years. This increase was not accompanied by an expansion of the system's capacity to continue operations without significant impacts on the performance and quality of transport services. It is very difficult to expand the airport infrastructure in today's conditions, so it is necessary to optimize the existing operations to increase the capacity and efficiency of the system. The paper focused on determining the correlation of individual key indicators of airport performance and their impact on delays, which was observed as an output variable. Three machine learning regression methods were applied, Decision Tree, Random Forrest and Support Vector Regression to predict delays with respect to other characteristics of traffic and surrounding airspace. All three methods were able to predict a delay with an error of ±60s in at least 91% of the test set, which shows a clear potential for the use of machine learning in this domain.
5.V. Bidikov, M. Gusev, V. Markozanov (Ss. Cyril and Methodius University in Skopje, North Macedonia Faculty of Computer Science and Engine, Skopje, Macedonia)
Network Traffic Impact on Cloud Usage at Different Providers 
The research question focuses on finding an optimal cost-less and efficient solution, analyzing the differences between uploading and downloading data between different cloud solutions. The conducted experiments compare AWS cloud platform offered by Amazon and use two of its products – computational cloud platform EC2 and storage cloud platform S3. We explore three different versions of S3 storage – S3 Standard, S3 Infrequent Access and S3 Glacier, each of them with its own purposes, characteristics and costs. Additionally we test the data transfer and computational capabilities of a t2.micro instance of the EC2 virtual machine. We then similarly compare the experiment on an European Cloud provider - Scaleway Elements and use two of its products - Virtual Instances based on the Stardust instances for computations and Object Storage a S3 compatible storage platform. For the transfer of data to and from S3, the tool used is Amazon’s client app (AWS CLI) offers a command line interface to upload data to and download from S3 instance with UNIX-like commands. For the transfer to and from the EC2 instance we use SCP with SSH. In order to test the computational performance of the machine, we utilize several short Python scripts which simulate different compute-intensive tasks depending on the size of the input parameters as well as the output results. For the transfer of data to Scaleway we can use the same tool (AWS CLI) since the infrastructure is S3 compatible while for the computational performance we can utilise the same Python scripts. We conclude that the network connection between Amazon nodes is far superior than any other, both in performance and costs. Fetching results from an AWS computational service (EC2) is much cheaper and faster when using an AWS platform as an intermediary (S3) compared to a direct transfer to the local machine. We observe a similar superior network performance in the comparison of Scaleway Cloud Infrastructure.
6.D. Mileski, M. Gusev (Sts Cyril and Methodius University in Skopje, Faculty of Computer Science and Engineering, Skopje, N, Skopje, Macedonia)
Serverless FaaS Scalability Evaluation: An ECG Signal Processing Use Case 
The power of abstraction and virtualization enables new technologies and new paradigms of software development. Container-level virtualization and abstraction of the service scalability and elasticity are made possible by serverless services that provide a completely new way of developing cloud services. One of the types of serverless technologies that provide these benefits is Function as a Service (FaaS). This paper presents a prototype application for processing ECG signals using serverless technologies,more precisely FaaS. The advantage of FaaS processing ECG signals from medical sensors, or any other type of IoT device, is that we develop services for which we do not need to manage the virtual machine or the containers where it will run (serverless), we only need to take care of the input, code, and output of FaaS and other cloud services coupled with FaaS which can also be serverless. The paper presents the advantages of FaaS in terms of elasticity and cost of services and evaluates the scalability performance by checking the following hypotheses. Hypothesis 1: The system will be highly scalable keeping the same response time and throughput, for up to 7000 data streams. Hypothesis 2: The system will be costless to process up to 7000 parallel data Streams.

Basic information:

Vlado Sruk (Croatia), Dejan Škvorc (Croatia)

Program Committee:

Željko Hocenski (Croatia), Leonardo Jelenković (Croatia), Hrvoje Mlinarić (Croatia), Jadranko F. Novak (Croatia), Vlado Sruk (Croatia), Dejan Škvorc (Croatia)

Registration / Fees:
Price in EUR
Up to 9 
May 2022
From 10 
May 2022
Members of MIPRO and IEEE
Students (undergraduate and graduate), primary and secondary school teachers

The discount doesn't apply to PhD students.


Vlado Sruk
University of Zagreb
Faculty of Electrical Engineering and Computing 
Unska 3 
HR-10000 Zagreb, Croatia

Phone: +385 1 612 99 45 
Fax: +385 1 612 96 53

The best papers will get a special award.
Accepted papers will be published in the ISSN registered conference proceedings. Presented papers in English will be submitted for inclusion in the IEEE Xplore Digital Library.
There is a possibility that the selected scientific papers with some further modification and refinement are being published in the following journals: Journal of Computing and Information Technology (CIT)MDPI Applied ScienceMDPI Information JournalFrontiers and EAI Endorsed Transaction on Scalable Information Systems.


Opatija is the leading seaside resort of the Eastern Adriatic and one of the most famous tourist destinations on the Mediterranean. With its aristocratic architecture and style, Opatija has been attracting artists, kings, politicians, scientists, sportsmen, as well as business people, bankers and managers for more than 170 years.

The tourist offer in Opatija includes a vast number of hotels, excellent restaurants, entertainment venues, art festivals, superb modern and classical music concerts, beaches and swimming pools – this city satisfies all wishes and demands.

Opatija, the Queen of the Adriatic, is also one of the most prominent congress cities in the Mediterranean, particularly important for its ICT conventions, one of which is MIPRO, which has been held in Opatija since 1979, and has attracted more than a thousand participants from over forty countries. These conventions promote Opatija as one of the most desirable technological, business, educational and scientific centers in South-eastern Europe and the European Union in general.

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