Hybrid Event

Event program

Tuesday, 5/26/2026 9:00 AM - 1:00 PM, Nava 1, Hotel Admiral, Opatija Papers  1. R. Ahmed (DHA Suffa University, Karachi, Pakistan), K. Ozkan, M. Ullah (LUT University, Lappeenranta, Finland) Integrated Energy Storage and Social Welfare Based Auction Mechanism for Wind-Generated Electricity  The production of the renewable energy has been targeted as a primary source of energy in recent years. Wind turbines play a crucial role in renewable electricity generation. The electricity generated by wind turbines is stored in batteries and later supplied to consumer. This study involves the storage process of the generated electricity by wind turbine, incorporating an AC/DC converter, voltage regulator, battery controller, battery and inverter to convert DC to AC in order to supply electricity to consumers. In this paper, the economical aspect of the supplied electricity is examined through the introduction of an auction system based on the concept of social welfare. The proposed auction system aims to determine the optimal trading point that benefits both consumers and sellers. The process works based on arranging consumer bids in descending order and seller bids in ascending order. The intersecting point is considered as trading point which represents the concept of the social welfare. The auction system is analyzed in the MATLAB environment. 2. K. Kvaternik (AVL AST d.o.o., Zagreb, Croatia), D. Pavkovic (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia), S. Stanković (Academy of Applied Technical and Preschool Studies Department of Niš, Niš, Serbia), M. Cipek (University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia), N. Faiz (M. Auezov South Kazakhstan University, Faculty of Information Technologies, Telecommunications and , Shymkent, Kazakhstan) Droop Control System Design and Simulation Verification for a Battery plus Supercapacitor Hybrid Power Supply  To manage energy flows and control the voltage in DC microgrids within narrow bounds, this paper proposes a control system for an actively-controlled battery/ultracapacitor hybrid energy storage system (HESS). The system uses a droop control system arrangement, wherein the individual voltage-controlled two-quadrant DC/DC converters for the battery and supercapacitor are extended by external droop feedback control loops tuned according to the Damping Optimum criterion. Voltage excursions from load changes are suppressed using a zero-pole-cancelling feed-forward compensator, with a Luenberger observer-based load compensator as an alternative if load measurement is not available. The proposed control strategy has been successfully tested by means of simulations. 3. S. Križanić, N. Žajdela Hrustek, N. Vrček (Faculty of organization and informatics, Varaždin, Croatia) Comparative Analysis of Business Process Digital Twins and Simulation Models: A Case Study in Drone Production  This paper investigates the theoretical and practical foundations and the distinctions between business process digital twins and business process simulation models. The research includes an overview of simulation methodologies and the concept of digital twins, followed by a case study involving drone production. In the case study, both a simulated production model and a digital twin of the drone production are developed and analyzed. The results demonstrate that there is no significant deviation between the simulated model and the digital twin, confirming that the digital twin operates accurately and reflects real-world conditions. This research contributes to a deeper understanding of the intersection between digital twin technology and simulations and indicates that simulation models can be used to validate the correct execution and fidelity of digital twins in a modern production environment, as well as provide insight into their interrelationships and respective roles in business process optimization. 4. M. Plenča, S. Aksentijević, A. Jugović, M. Jardas (University of Rijeka, Faculty of Maritime Studies, Rijeka, Croatia) Smart Port Ecosystems and the Hydrogen Economy: A Case Study of Maritime Decarbonization in Split  This paper investigates the technical, regulatory, and environmental feasibility of integrating hydrogen refueling infrastructure into existing port systems, focusing on the Port of Split as a case study. The aim is to analyze the implementation potential of a hydrogen refueling station designed for passenger transport, to meet a daily demand of approximately 1,130 kg of hydrogen for the Split-Supetar ferry route. The methodology combines techno-modelling analysis based on results from the Interreg IT-HR project TransH2 with both qualitative and quantitative indicators of feasibility. The anticipated environmental effects include the elimination of significant amounts of CO₂ emissions, together with reductions in noise and improvements in air quality. This work contributes to developing a scalable framework for hydrogen maritime infrastructure in Croatia and the Adriatic region. 5. V. Omelyanenko, O. Omelianenko (Institute of Industrial Economics of National Academy of Sciences of Ukraine, Sumy, Ukraine), I. Pidorycheva (Institute of Industrial Economics of National Academy of Sciences of Ukraine, Kyiv, Ukraine), O. Prokopenko (Estonian Entrepreneurship University of Applied Sciences, Tallinn, Estonia), Y. Revtiuk (Poznan University of Technology, Poznan, Poland) Industrial Smart City Project Management  The paper addresses the problem of managing industrial smart city projects, emphasizing the limitations of fragmented and sector-based project management approaches. The study proposes an ecosystem-oriented project management framework based on the principles of industrial symbiosis, where industrial enterprises, urban infrastructure, digital platforms, and stakeholders interact as elements of a unified system. Particular attention is paid to the formation of a technological core as a system-forming digital-industrial platform that supports technology transfer, innovation diffusion and sustainable development. A methodology for the integral evaluation of the technological core of an industrial smart city project is developed, incorporating parameters of digital integration, technological openness, innovation capacity, ecosystem interaction, technological maturity, and sustainability. The applicability of the proposed approach is illustrated through a comparative assessment of selected European industrial smart city projects 6. L. Calcich, V. Valentić, V. Kirinčić, R. Prenc (RITEH, Rijeka, Croatia) Digital Twin–Enabled Virtual Power Plants for Smart Energy Systems and E-Mobility Integration in Croatia  This paper analyzes and examines the optimal structure and operation of the Croatian power system under a scenario of full electrification of road transport, employing the concept of a digital twin–enabled virtual power plant. Particu- lar emphasis is placed on the flexibility of electric vehicles and their aggregation into a virtual power plant as a distributed source of energy storage and system regulation. The system is modeled on an hourly basis for a representative year, assuming that total electricity demand is supplied exclusively by solar and onshore wind generation, complemented by battery energy storage systems. Additional electricity demand from electric vehicles is incorporated into the model, and three control strategies are analyzed: uncontrolled charging, smart charging, and bidirectional vehicle-to-grid (V2G) oper- ation. The obtained results enable a quantitative assessment of the impact of different flexibility levels on the optimal system design. Smart charging reduces the required installed capacities of renewable generation and energy storage, while the implementation of V2G further lowers total system costs and significantly decreases the need for stationary battery storage systems. These findings could confirm that digital twin–enabled virtual power plants, integrated within smart energy systems and e-mobility, will enable a more resilient, robust, and secure Croatian power system. 7. G. Marković (Fakultet informatike i digitalnih tehnologija, Rijeka, Croatia) Cognitive Enterprise Architecture: Extending the Business Motivation Model through Temporal Knowledge Graphs and Agentic AI for Dynamic Strategic Alignment  In contemporary business environments, achieving sustainable organizational agility remains challenging due to a persistent gap between strategic intent and technical implementation. Traditional enterprise architecture frameworks, including the Business Motivation Model (BMM), provide standardized vocabularies for documenting strategic directions; however, they remain predominantly static and descriptive rather than operational. This research introduces the Cognitive BMM—an extension of the Object Management Group's Business Motivation Model that integrates temporal knowledge graphs and artificial intelligence to enable adaptive enterprise architecture capable of dynamic strategic alignment. The proposed framework extends the BMM with a temporal dimension that enables recording validity periods for objectives, capabilities, and IT resources, ensuring that decisions are predicated upon current business facts. Upon this temporal foundation, we superimpose agentic AI capabilities through a multi-layered architecture comprising: (i) a memory layer implemented as a temporal knowledge graph; (ii) a reasoning layer employing large language models; and (iii) a planning layer that decomposes strategic objectives into actionable tactics. To address limitations of standard RAG systems, we introduce corrective retrieval strategies that evaluate document relevance. Through responsibility-based alignment formalization and multi-agent systems representing organizational hierarchy, Cognitive BMM transforms business-IT alignment from a periodic planning exercise into a continuous, self-correcting system. 8. M. Ilic, M. Kolarski, A. Tomčić, S. Penjivrag, M. Tošić (VizLore Labs, Novi Sad, Serbia) Edge-Driven Orchard Analytics: Automated Treetop Detection using YOLOv11  Smart farming represents the application of modern Information and Communication Technologies (ICT) in agriculture, and using these advances to maximize yield and optimize processes. One major agricultural challenge is that of fruit cracking, a peel disorder which occurs mainly in the pre-harvest stage and limits fruit quality and yield, and causes significant food waste. The Horizon project CrackSense aims to address this challenge by developing and upscaling smart sensing technologies, leading to efficient and high-resolution monitoring of agri-environmental conditions through the use of state-of-the-art machine learning (ML) models. This paper presents a localized edge-computing solution for automated treetop detection in citrus orchards. This is a crucial step in the overall CrackSense approach to food cracking risk assessment. We utilize the YOLOv11 architecture, trained on open-access datasets, to perform simultaneous object detection and instance segmentation of tree canopies. On-site deployment in remote environments with limited connectivity is achieved by implementing this detection system on specialized edge devices, capable of accommodating these models in the field. The technical pipeline integrates raw model inferences with custom post-processing algorithms designed to refine canopy boundaries and extract precise treetop coordinates. This approach minimizes data transmission overhead and bandwidth costs by processing data at the source. 9. K. Topolko Herceg (Faculty of Organization and Informatics, Varaždin, Croatia) Continuous Auditing: From Regulatory Compliance to Digital Resilience  In today's digital economy, organizations face a paradox: strict regulatory frameworks impose rigid compliance standards, while the dynamic nature of cyber threats demands digital resilience. This paper analyzes the transformation of internal auditing from a reactive oversight function into a strategic, proactive partner that bridges the gap between regulatory requirements and operational security. The focus shifts from passive fulfillment of legal obligations toward proactive, agile management approach that generates added value. By reducing the information asymmetry between IT and management, continuous auditing establishes a direct channel of transparency that is essential for agile decision-making across the organization. By integrating agile principles and data analytics directly into business processes, auditors ensure the integrity of digital assets and business continuity under crisis conditions. Rather than retroactively correcting errors, continuous auditing becomes a guardian of digital trust, enabling management to make strategic decisions with greater certainty, knowing that the data and processes underlying those decisions are verified and resilient to manipulation. The paper concludes that continuous auditing enables organizations to build a robust ecosystem where compliance serves as the foundation and digital resilience as a key competitive advantage in an uncertain economic environment.

Basic information:

Neven Vrček (Croatia), Slavko Vidović (Croatia), Ernest Vlačić (Croatia), Ranko Smokvina (Croatia)

Darinko Bago (Croatia), Hrvoje Balen (Croatia), Vladimir Olujić (Croatia), Nedjeljko Perić (Croatia), Tadej Slapnik (Slovenia), Marija Šćulac Domac (Croatia), Ivan Vidaković (Croatia), Slavko Vidović (Croatia), Ernest Vlačić (Croatia)

Zoran Aralica (Croatia), Boris Blumenschein (Croatia), Darko Bosnar (Croatia), Bojan Jerbić (Croatia), Goran Marković (Croatia), Mladen Mrvelj (Croatia), Matija Srbić (Croatia), Marija Šutina (Croatia), Domen Verdnik (Croatia), Marko Vidović (Croatia)

Neven Vrček
University of Zagreb
Faculty of Organization and Informatics
Pavlinska 2
HR-42000 Varaždin, Croatia

Phone: +385 42 390 830
E-mail: nvrcek@foi.unizg.hr

Accepted papers will be published in the ISSN registered conference proceedings. Papers in English presented at the conference will be submitted for inclusion in the IEEE Xplore Digital Library. 

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 180 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 attracts 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.

For more details, please visit www.opatija.hr and visitopatija.com.