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Event program
Thursday, 5/25/2017 9:00 AM - 12:15 PM,
Camelia 1, Grand hotel Adriatic, Opatija
9:00 AM - 10:30 AMPapers 
1.M. Shopov (Technical University of Sofia, branch Plovdiv, Plovdiv, Bulgaria)
IoT Gateway for Smart Metering in Electrical Power Systems - Software Architecture 
The paper presents an implementation of IoT gateway for smart metering in electrical power systems. The gateway is based on Ubuntu Core and connects power meters and cloud services. Several software architecture design patterns are evaluated. Adaptation and implementation of one of them for the gateway application is described in the paper.
2.I. Čavrak, I. Žagar, A. Dražić (University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia)
Application Models for Ubiquitous Systems with Sporadic Communication Availability 
Ubiquitous computing systems are predominantly characterized by limited computing power, communication capabilities and energy sources. Yet novel usage scenarios shift their roles from basic data acquisition and forwarding to performing more sophisticated tasks such as data processing, local service provisioning and actuation. In order to meet their goals, horizontal or vertical collaboration and task distribution is often required; utilizing resources identified in the nearby communication environment or offered by remote, cloud- or fog-based services. However, different infrastructural and energy-related constraints can severely influence device’s communication capabilities thus dictating the level of provided functionality. In this paper we focus on the class of ubiquitous systems without permanent communication links, utilizing only sporadic communication with global computing infrastructure. Such systems exploit short-term presence of third-party communication and computational resources in their environment, adapting their service level to available resource properties. A number of identified communication and computation scenarios is described for such a resource constrained and time-variable environment, along with the incentive model for using and provisioning of short-term resources. A general model of adaptive distributed applications exploiting such sporadic communication and computation environment is presented, relying on cloud- and fog-computing paradigms and microservices as its building blocks.
3.P. Rantanen, P. Sillberg, J. Soini (Tampere University of Technology, Pori, Finland)
Towards the Utilization of Crowdsourcing in Traffic Condition Reporting 
The use of traffic information in map applications designed for stand-alone navigation devices as well as in mobile devices has become a common trend. This information is often governed by the various service providers with little or non-existent feedback from the users. Using a wide userbase it is possible to collect information on traffic conditions faster and more efficiently. Combining information collected from multiple users can also be used to validate the information. Additionally, many of the events faced on the road can be challenging to detect by automatic means, but are easily noticed by the road users – animals on the road and broken or missing road signs are only a few examples. To better facilitate the utilization of information gathered from road users, simple and easy-to-use software solutions are required. This paper presents a prototype mobile application, which the road users can take advantage of for both following the on-going traffic conditions while driving and for collectively reporting traffic events other users might be interested in. The software architecture, the application and the data format utilized for transferring the reports is presented in addition to the preliminary findings of the research.
4.M. Saari (Tampere University of Technology / Department of Pori, Pori, Finland), A. Baharudin (Keio University, Tokyo, Japan), S. Hyrynsalmi (Tampere University of Technology / Department of Pori, Pori, Finland)
Survey of Prototyping Solutions Utilizing Raspberry Pi 
Sensor networks are a highly researched application area in the field of Internet of Things (IoT). A key cost and resource question in the development of IoT network sensor solutions is prototype implementation. In this study, the Raspberry Pi—a widely used single board computer—is investigated as it is one of the most commonly used prototyping devices available and is also widely used in scientific research. In this paper, we address which technologies, the usefulness and what kinds of issues arise when the prototyping of a sensor network solution is done with Raspberry Pi. The extant literature is studied by selecting papers with the systematic literature review method. Based on an extensive survey of the selected studies, we found several sensor-based implementations where Raspberry Pi has been used. In addition, this survey revealed subjects, such as e-health and education, which expanded the research topic in new ways. Further research opportunities have been identified in specifying the usefulness of various technologies with single board computers.
5.A. Drmic, M. Silic, G. Delac, K. Vladimir, A. Kurdija (University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia, Zagreb, Croatia)
Evaluating Robustness of Perceptual Image Hashing Algorithms 
In this paper we evaluate the robustness of perceptual image hashing algorithms. The image hashing algorithms are often used for various objectives, such as images search and retrieval, finding similar images, finding duplicates and near-duplicates in a large collection of images, etc. In our research, we examine the image hashing algorithms for images identification on the Internet. Hence, our goal is to evaluate the most popular perceptual image hashing algorithms with the respect to ability to track and identify images on the Internet and popular social network sites. Our basic criteria for evaluation of hashing algorithms is robustness. We find a hashing algorithm robust if it can identify the original image upon visible modifications are performed, such as resizing, color and contrast change, text insertion, swirl etc. Also, we want a robust hashing algorithm to identify and track images once they get uploaded on popular social network sites such as Instagram, Facebook or Google+. To evaluate robustness of perceptual hashing algorithms, we prepared an image database and we performed various physical image modifications. To compare robustness of hashing algorithms, we computed Precision, Recall and F1 score for each competing algorithm. The obtained evaluation results strongly confirm that P-hash is the most robust perceptual hashing algorithm.
6.K. Obarčanin, R. Ostojić, S. Džuzdanović (DV Power, Stockholm, Lidingö, Sweden)
Parameters for Condition Assessment of the High Voltage Circuit Breakers Arcing Contacts using Dynamic Resistance Measurement 
Circuit Breakers are one of the most important elements in the transmission and distribution of electrical energy, and assessing their condition is of the upmost importance regarding the health and safety of the transmission and distribution system. Numerous procedures and parameters exist that directly reflect the state of the circuit breaker, but this paper focuses on a relatively new procedure that measures and estimates the states of the arcing contacts of the circuit breaker. The state of the arcing contacts is in a direct correlation with the health of the circuit breaker, and the important parameters during this Dynamic Resistance test will be explained. The results obtained using developed algorithm are demonstrated in the field on a real circuit breaker, completing thus all necessary steps for the assessment of the arcing contacts.
10:30 AM - 11:00 AMBreak 
11:00 AM - 12:15 PMPapers 
1.N. Kakanakov, M. Shopov (Technical University of Sofia, Plovdiv branch, Plovdiv, Bulgaria)
Adaptive Models for Security and Data Protection in IoT with Cloud Technologies 
The paper presents an example Sensor-cloud architecture that integrates security. It is based on the multi-tier client-server model with separation of physical and virtual instances of sensors, gateways, application servers and data storage. It proposes the application of virtualized sensor nodes as a prerequisite for increasing security, privacy, reliability and data protection. All main concerns in Sensor-Cloud security are addressed: from secure association, authentication and authorization to privacy and data integrity and protection. The main concept is that securing the virtual instances is easier to implement, manage and audit and the only bottleneck is the physical interaction between real sensor and its virtual reflection.
2.A. Šarić (RIT Croatia, Dubrovnik, Croatia), B. Mihaljević, K. Marasović (RIT Croatia, Zagreb, Croatia)
Making a Smart City Even More Intelligent Using Emergent Property Methodology 
With the emergence of IoT (Internet of Things) smart cities have assumed a crucial role in providing intelligent services in real time to residents and visitors, by integrating services such as smart transportation, smart parking and smart people management. By introducing emergent properties as the system's new behaviors or new structures, the system gains another higher level of intelligence that can not be derived from its underlying substructures individually. In this paper we propose a new model for introducing emergent properties by integrating existing smart city subsystems which are already in use in the city of Dubrovnik, Croatia. The article starts with an overview of the emerging property methodology and smart city technologies. The existing smart city subsystems are explained along with their integration within emergent properties model. The paper concludes with our findings and recommendations, open issues and future research possibilities.
3.F. Sušac, I. Aleksi, Ž. Hocenski (Fakultet elektrotehnike, računarstva i informacijskih tehnologija, Osijek, Croatia)
Digital Chess Board Based on Array of Hall-Effect Sensors 
This paper addresses a novel concept of digital chess board realized with an array of Hall Effect sensors. Main task of digital chess board is autonomous detection of player's moves. Therefore, players do not have to write down their own moves on a sheet of paper. Noninvasive piece moves detection is considered, with minimum required installations in a game room. The digital chess board presented in this paper has a Hall Effect sensor placed under the middle of each field on the chess board, while each chess piece has a permanent magnet placed on its bottom. Sensors, total of 64, are organized as 8x8 array. Microcontroller reads sensor data and sends them to a remote PC for storage in a database and board visualization. Rows are multiplexed in time, i.e. one row is active in a certain time instance. States in the column of the currently active row are stored in a corresponding matrix column. Con to this approach is in its ability to detect piece presence on the field, without the information about the piece type. The proposed approach is low cost, non-invasive and requires only power and communication cable.
4.S. Kružić, J. Musić, I. Stančić (Fakultet elektrotehnike, strojarstva i brodogradnje, Split, Croatia)
Influence of Human-Computer Interface Elements on Performance of Teleoperated Mobile Robot 
Mobile robots are becoming ubiquitous with constant development of innovative applications, which usually include certain degree of autonomy on robot's side. However, due to uncertain and dynamic nature of operational environment, algorithms for autonomous operation might fail, and in order to assist the robot, the need to take control over the mobile robot from remote location arises. In order to efficiently and safely teleoperate the robot, dislocated human operator has to have high degree of situational awareness. This can potentially be achieved with appropriate human-computer interface, so that the remote environment model constructed with available sensor data is presented at appropriate time and in appropriate manner, and that robot commands can be issued intuitively and easily. In the research, influence of human-computer interface elements (both for input commands and user feedback) on performance of teleoperated mobile robot was studied in several application scenarios and with several human-machine interface set-ups. The user study was performed in which accuracy and speed of completion of given tasks were measured on a real robot. Statistical analysis was performed in order to identify the optimal combination of human-computer interface elements. Finally, conclusions were drawn with emphasis on benefits of information technology in particular case.
5.R. Rodin, I. Štajduhar (Faculty of Engineering, Rijeka, Croatia)
The Challenge of Measuring Distance to Obstacles for The Purpose of Generating a 2-D Indoor Map Using an Autonomous Robot Equipped with an Ultrasonic Sensor 
In this paper, we deal with some preliminaries concerning the problem of creating a reasonably accurate 2D indoor map, using an autonomous mobile robot equipped with an ultrasonic sensor. For this purpose, we utilize the robotic frame DiddyBorg, coupled with the latest Raspberry Pi model. The accuracy of the used ultrasonic sensor is tested in a simulated and a real-world environment. Ultrasonic sensor flaws cause errors in the area mapping process, in the form of precision decline and unwanted ghost points, usually around the corners of an indoor environment. We present a method for filtering these unwanted occurrences. The method has been tested in a controlled test box environment and in the real-world indoor environment. We have used a square, a triangle, and a hexagon as shapes for the testing environment. As a basis for the mapping process, ordinary trigonometry was used, whereas cluster analysis was used for the removal of errors. Experimental results suggest that the proposed method is reasonably accurate in determining correct position and distance of measured points from single-point scans.
12:15 PM - 3:00 PMLunch break
Thursday, 5/25/2017 3:00 PM - 6:15 PM,
Camelia 1, Grand hotel Adriatic, Opatija
3:00 PM - 3:30 PMInvited Lecture
A. Merluzzi,  G. Brunetti  (Danieli Automation S.p.A., Buttrio, Italy)
Metals Industry: Road to Digitalization  
3:30 PM - 4:15 PMPapers
1.R. Dzeng, H. Hsueh, C. Ho (National Chiao-Tung University, Hsinchu, Taiwan)
Automated Posture Assessment for Construction Workers 
Construction workers often suffer various kinds of musculoskeletal disorders (MSDs), which are injuries in the human musculoskeletal system. MSDs are often aroused due to sudden exertion such as lifting heavy equipment, or repeated and cumulative stressed motions. OWAS (Ovako Working posture Assessment System) may be used to evaluate the exposure of MSDs risk by sampling the snapshots of a worker’s postures and categorize the postures. However, tracking and categorizing postures of different body parts by human eyes are tedious work with limited accuracy and easy to make mistakes even with facilitation of video recording. This research develops an automatic tracking and categorizing system, named Posture Assessment System for MSD (PAS-MSD) for OWAS using Microsoft Kinect. The PAS-MSD captures human postures during his/her movement, recognizes human skeleton, and assesses the risk of MSD. An experiment with typical construction activities such as handling and moving of materials, hammering, and tiling was conducted. Except for the hammering activity where the subjects’ body parts were easily blocked by the target hammered box and could not be detected by Kinect, the posture identification accuracies for all other activities exceed 90% (i.e., 91.6%-93.9%). The OWAS categorization accuracies are also satisfactory, ranging from 85.4%-88.5%.
2.S. Ul'yanov, N. Maksimkin (Matrosov Institute for System Dynamics and Control Theory of SB RAS, Irkutsk, Russian Federation)
Software Toolbox for Analysis and Design of Nonlinear Control Systems and Its Application to Multi-AUV Path-Following Control 
In the paper, we present a software toolbox for rigorous analysis and design of nonlinear continuous and discretecontinuous (digital) control systems based on the reduction method and sublinear vector Lyapunov functions. For these systems, the toolbox provides solution of the following problems: verification of dynamic properties of dissipativity, asymptotic and practical stability; computation of estimates of basic direct indicators of dynamic quality (accuracy, domains of attraction and dissipativity, settling time and others); synthesis of parameters that ensure desirable or optimal quality of the system. In addition, we show how the toolbox could be applied to solve the path-following control problem for a single autonomous underwater vehicle (AUV) as well as for multi-AUV formations. In our statements of the path-following control problem, we take into account together uncertainties of AUVs model, inaccuracy of measurements, and constraints on control actions.
3.G. Bakalar, M. Baggini, S. Bakalar (Bonum Mare Consulting, Cocoa Beach, United States)
Remote Alarm Reporting System Responsive to Stoppage of Ballast Water Management Operation on Ships 
This paper reviews ballast water treatment systems regarding functional and operational problems. The researched invention in this paper aids in understanding how important it is to learn more about ballast water treatment system (BWTS) experiences from crewmembers, since has been proven that more time would be needed for the maintenance of ballast water management systems. Ballast water treatment systems could be in failure or under repair. The state of art in this field has been analysed and the essence of the invention has been described in detail. New invented sensors based on flow measurement methodologies should report malfunctions through wireless and wired communications automatically and that was ascertained in this paper. This invention is the solution concerning the quality control of ship’s ballast water, and this is the system which would timely and with a higher degree of certainty establish the quality of ballast water treatment operations on ships. The system according to this invention is autonomous in relation to the ship’s crew and eliminates a possibility that the members of the ship’s crew influence the control of the ballast water, and it excludes the possibility of concealing a possible defect or irregular operation of the device for ballast water management.
4:15 PM - 4:45 PMBreak 
4:45 PM - 6:15 PMPapers 
1.U. Kuhar, G. Kosec, A. Švigelj (Jozef Stefan Institute, Ljubljana, Slovenia)
Measurement Noise Propagation in Distribution-System State Estimation 
The distribution power networks are growing in complexity due to the increasing penetration of the distributed power generation such as from wind and solar plants, and distributed resources such as electric vehicles and batteries, which are making the operation of the system more and more challenging. The first step towards more efficient operational capabilities is to introduce an observability of the system. Power system is considered observable, when all its system variables are known, in other words, system variables are chosen in such a way that when known, they allow computation of all other physical quantities in the system. In this paper a State Estimation (SE) software that considers bus voltage magnitudes and phase angles as state variables is presented. To deduce the state of the system from measurements a non-linear relation between measurements and state variables is used. The system is also overdetermined, i.e. there are more measurements then state variables. A nonlinear Weighted Least Square (WLS) approach is used to solve the problem at hand with the final goal to demonstrate how quality of measurements affects the quality of power system state awareness. The results are presented in terms of statistical information about the state variables estimated with presented state estimator using generated measurements with added zeromean Gaussian noise. We show that noise propagation through the SE algorithm is greatly influenced by the selection and placement of measurement devices.
2.J. Stanić (Mi-Maris d.o.o., Ivanić Grad, Croatia), D. Maršić, G. Malčić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Application of Integrated Fail-Safe Technology for Safe and Reliable Natural Gas Distribution 
Simultaneously with the development of modern industrial plants there are also increasing demands for more powerful industrial automation systems in terms of safer and more reliable process. Failure or malfunction of specific component of the system can result with fatality or negative effects on the equipment and/or the environment. Apart from this, a downtime of a plant can cause big financial losses. However, the implementation of fail-safe (FS) technology and fail-safe programmable logic controllers (PLC) prevents above-mentioned harmful consequences. This paper focuses on the implementation of fail-safe technology in a gas pressure reducing station. It generally describes how fail-safe system of boiler room directly effects on the reliability of natural gas distribution.
3.D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
Brief Review of Self-Organizing Maps 
As a particular type of artificial neural networks, self-organizing maps (SOMs) are trained using an unsupervised, competitive learning to produce a low-dimensional, discretized representation of the input space of the training samples, called a feature map. Such a map retains principle features of the input data. Self-organizing maps are known for its clustering, visualization and classification capabilities. In this brief review paper basic tenets, including motivation, architecture, math description and applications are reviewed.
4.D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
Fault Detection for Aircraft Piston Engine Using Self-Organizing Map 
Aircraft piston engine can be monitored using an advanced graphic engine monitor. Such engine monitor can supply a large amount of data containing evolution of engine parameters through the time. Analysis of a vast amount of multidimensional temporal data by a self-organizing map may aid in data visualization, but also in detection of engine parameter deviations from normality indicating potential problems in operation of aircraft piston engine. For determination of engine parameter space that corresponds to normal engine operation quantization error of the self-organizing map is used.
5.T. Šimović (KPT, Zagreb, Croatia), G. Malčić (TVZ, Zagreb, Croatia)
Redundantno upravljanje hlađenjem energetskog transformatora 
Rad prikazuje poboljšanje standardnog rješenja relejnog upravljačkog kruga hlađenja energetskog transformatora uvođenjem dodatnog sekundarnog računalnog upravljačkog kruga. Kod OFAF i OFWF načina hlađenja transformatora pomoću standardnog upravljačkog kruga, i u ručnom i u automatskom načinu rada prva grupa hlađenja je stalno uključena, dok se ostale grupe povremeno uključuju ili porastom temperature ulja ili namota. Posljedica takvog nejednolikog rada su češći kvarovi u prvoj grupi hlađenja te zatajenje ostalih grupa usljed povremenog rada. Redundantni računalni sustav upravljanja temeljen na PLC uređaju bi u slučaju neprekidnog rada jedne grupe hlađenja određeno vrijeme ili njenog zatajenja rada, automatski isključio standardni relejni upravljački sklop i po vremenskom algoritmu izmjenjivao grupe hlađenja u radu. U slučaju kvara ili prestanka rada računalnog sustava, sustav bi se vratio na relejno upravljanje. Očekivana korist ovakvog kombiniranog rješenja je podjednako trošenje hladnjaka, povećana pouzdanost sustava hlađenja te smanjenje potrebe fizičke prisutnosti osoblja održavanja u transformatorskom postrojenju.
6.L. Kapraljević, G. Kemfelja (CROMOBIL d.o.o., Zagreb, Croatia), D. Maršić, G. Malčić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Platforma za izradu korisnički specifičnih uređaja 
Primjenom mikrokontrolerskih struktura u elektroničkim sklopovima moguće je ostvariti specifične funkcije pojedinih sklopova i projektirati ih kao zasebne uređaje te ih zatim povezati u funkcionalne cjelinu čineći time modularno računalo. Gledajući standardna rješenja na tržištu, pomoću takve objektne strategije izrade elektroničkog sklopovlja postiže se veća fleksibilnost prilikom same izrade, a posebno daljnjeg mogućeg proširenja uređaja. Temeljem te ideje, u ovom radu prikazan je projekt sklopovskog i programskog rješenja platforme za izradu korisnički specifičnih uređaja.
Basic information:

Vlado Sruk (Croatia), Leonardo Jelenković (Croatia), Dejan Škvorc (Croatia), Jadranko F. Novak (Croatia), Nikola Mišković (Croatia)

Steering Committee:

Matjaž Colnarič (Slovenia), Željko Hocenski (Croatia), Niko Guid (Slovenia)

Registration / Fees:
Price in EUR
Before 8 May 2017
After 8 May 2017
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 ISBN registered conference proceedings. Papers written in English and presented at the Conference will be submitted for posting to IEEE Xplore.
There is a possibility that the selected scientific papers with some further modification and refinement are being published in the Journal of Computing and Information Technology (CIT).

International Program Committee General Chair:

Petar Biljanović (Croatia)

International Program Committee:

Slavko Amon (Slovenia), Vesna Anđelić (Croatia), Michael E. Auer (Austria), Dubravko Babić (Croatia), Snježana Babić (Croatia), Almir Badnjevic (Bosnia and Herzegovina), Mirta Baranović (Croatia), Bartosz Bebel (Poland), Ladjel Bellatreche (France), Eugen Brenner (Austria), Gianpiero Brunetti (Italy), Andrea Budin (Croatia), Željko Butković (Croatia), Željka Car (Croatia), Matjaž Colnarič (Slovenia), Alfredo Cuzzocrea (Italy), Marina Čičin-Šain (Croatia), Marko Čupić (Croatia), Marko Delimar (Croatia), Todd Eavis (Canada), Maurizio Ferrari (Italy), Bekim Fetaji (Macedonia), Renato Filjar (Croatia), Tihana Galinac Grbac (Croatia), Paolo Garza (Italy), Liljana Gavrilovska (Macedonia), Matteo Golfarelli (Italy), Stjepan Golubić (Croatia), Francesco Gregoretti (Italy), Stjepan Groš (Croatia), Niko Guid (Slovenia), Jaak Henno (Estonia), Ladislav Hluchy (Slovakia), Vlasta Hudek (Croatia), Željko Hutinski (Croatia), Mile Ivanda (Croatia), Hannu Jaakkola (Finland), Leonardo Jelenković (Croatia), Dragan Jevtić (Croatia), Robert Jones (Switzerland), Peter Kacsuk (Hungary), Aneta Karaivanova (Bulgaria), Marko Koričić (Croatia), Tomislav Kosanović (Croatia), Mladen Mauher (Croatia), Igor Mekjavic (Slovenia), Branko Mikac (Croatia), Veljko Milutinović (Serbia), Nikola Mišković (Croatia), Vladimir Mrvoš (Croatia), Jadranko F. Novak (Croatia), Jesus Pardillo (Spain), Nikola Pavešić (Slovenia), Vladimir Peršić (Croatia), Slobodan Ribarić (Croatia), Janez Rozman (Slovenia), Karolj Skala (Croatia), Ivanka Sluganović (Croatia), Mario Spremić (Croatia), Vlado Sruk (Croatia), Stefano Stafisso (Italy), Uroš Stanič (Slovenia), Ninoslav Stojadinović (Serbia), Mateo Stupičić (Croatia), Jadranka Šunde (Australia), Aleksandar Szabo (Croatia), Laszlo Szirmay-Kalos (Hungary), Dina Šimunić (Croatia), Zoran Šimunić (Croatia), Dejan Škvorc (Croatia), Antonio Teixeira (Portugal), Edvard Tijan (Croatia), A Min Tjoa (Austria), Roman Trobec (Slovenia), Sergio Uran (Croatia), Tibor Vámos (Hungary), Mladen Varga (Croatia), Marijana Vidas-Bubanja (Serbia), Mihaela Vranić (Croatia), Boris Vrdoljak (Croatia), Damjan Zazula (Slovenia)


Opatija, with its 170 years long tourist tradition, 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 renowned artists, politicians, kings, scientists, sportsmen as well as business people, bankers, managers for more than 170 years.

The tourist offering of Opatija includes a vast number of hotels, excellent restaurants, entertainment venues, art festivals, superb modern and classical music concerts, beaches and swimming pools and is able to provide the perfect response to all demands.

Opatija, the Queen of the Adriatic, is also one of the most prominent congress cities on the Mediterranean, particularly important for its international ICT conventions MIPRO that have been held in Opatija since 1979 gathering more than a thousand participants from more than forty countries. These conventions promote Opatija as the most desirable technological, business, educational and scientific center in Southeast Europe and the European Union in general.

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