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Presented papers written in English and published in the Conference proceedings will be submitted for posting to IEEE Xplore.
Accepted Papers
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A. Salihbegovic, T. Eterovic, E. Kaljic, S. Ribic (Faculty of Electrical engineering, Sarajevo, Bosnia and Herzegovina)
Design of a domain specific language and IDE for Internet of things applications 
With the goal of relieving the Internet of things application designers of the complexities and heterogeneity of wireless sensory networks (WSNs), devices, communication media, protocols and operating systems, the development of higher level domain specific language has been undertaken. The result is DSL-4-IoT Editor- designer, which is based on high level visual programming language, established on the class of visual domain specific modelling languages ( VDSMLs). DSL-4-IoT is using UML like formal presentations and abstract syntax in a metamodel. The frontend of the Editor has been developed in JavaScript language.
The runtime execution of generated IoT application configuration files, is carried out by the open source project “OpenHab” runtime engine.
To address scalable operations within the IoT system application logic that connects “things” in interconnected wireless sensory networks of devices and users, hierarchical clustering is specified consisting of : system, subsystem, device ( autonomous and powered ) and physical or virtual channel.
Selected VDSML, model driven approach, applied in development of DSL-4-IoT visual design environment, shall contribute the undergoing quest among researchers and designers for design tools that empower IoT application designers, to model their systems at a higher abstraction level, providing them with automatic model transformations to incrementally refine abstract models into more concrete ones and deploy them based on IoT devices and components available on industrial and commercial markets.
In order to demonstrate the viability and usability of the developed DSL-4-IoT visual model based language, an experimental IoT testbed including 15 heterogeneous wireless sensory nodes and spanning two application domain ( smart home and smart patient , alas medical tele monitoring), has been designed and deployed.
Sensors and actuators used in build-up of experimental testbed are either autonomous wireless devices with integral communication transceiver channel, or hooked up to large number of wireless sensory nodes ( stationary, mobile or wearable ), based on different communication technologies ( Wi-Fi, ZigBee, Z-wave, Bluetooth, NFC, ) and protocols ( HTTP, TCP/IP, UDP, MQTT, Modbus, SimpliciTI, serial protocols etc.)
User interface, that provides monitoring as well as full control of all devices, sensors and actuators that have been implemented within the IoT experimental testbed, is provided as web application accessible in any web browser that has JavaScript runtime engine included, connecting to IP address of the IoT testbed server. With the developed editor and IDE, the end user is able to create IoT applications, on all platforms be it computer, laptop or even a smartphone or tablet with the Android or Apple iOS operating system
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A. Šimec, D. Lozić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Basic PHP Implementations, Opcodes and Internal Work
The main purpose of this paper is to investigate how PHP works internally, how variables, arrays, objects, etc. are stored in memory. The paper will cover some generated series of operation codes, commonly known as "opcodes", and why advanced PHP programmers should know, at least, basics of PHP "under-the-hood". Also, one of the goals is to show how function calls and classes work internally, basic concepts like "is pre-increment or post-increment faster" and, as a PHP developer, what you should or should not do in your code.
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B. Sredojev, D. Samardzija (University of Novi Sad, Faculty of Technical Sciences, Novi Sad, Serbia), D. Posarac (RT-RK Institute for Computer Based Systems, Novi Sad, Serbia)
WebRTC technology overview and signaling solution design and implementation
This paper describes the WebRTC technology and implementation of WebRTC client, server and signaling. Main parts of the WebRTC API are described and explained. The client application demonstrates the use of the WebRTC API for achieving real-time communication. The server application is implemented as a WebSocket server. Signaling methods and protocols are not specified by the WebRTC standards, therefore in this study we design and implement a novel signaling mechanism. The corresponding message sequence chart of the WebRTC communication behavior describes a communication flow between peers and the server. Benefits and future development of the WebRTC technology are mentioned.
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D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
Methods for Geotargeting Redirection in Corporate Wide Area Networks
In business organizations, particularly large ones, it is sometimes necessary to manage web users according to their geographic location. Final destination can be either business related web site or web application server. Such redirection can be accomplished in numerous ways. The choice depends on a goal one want to achieve: distribution of user load to optimal site, achieving high availability or booth. Several interesting methods suitable for geographically dispersed clusters of web (application) servers are presented and analyzed. This includes load dispatchers, client side scripts, server side scripts, multiple DNS records as well as combinations of these techniques. Reviewed methods are compared and their benefits and shortcomings are discussed.
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D. Miljković (Hrvatska elektroprivreda d.d., Zagreb, Croatia)
Geographically Dispersed Cluster of Web Application Servers on Virtualization Platforms
For business critical web applications high availability is of paramount importance and clusters of application servers are a viable solution. To achieve even higher availability cluster nodes should be geographically dispersed, i.e. deployed at multiple sites in two or more datacenter premises of a larger business system. In this paper solutions for geographically dispersed clusters of application servers installed on virtualization platforms are described. Most of the time geographically dispersed clusters are overprovisioned and as such are very expensive, considering cost of servers, network, maintenance and software licensing. Virtualization and the choice of appropriate solution can reduce this cost. Advantages and disadvantages of particular solutions are analyzed.
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K. Šimenić, I. Lukić, M. Köhler (Elektrotehnički fakultet Osijek, Osijek, Croatia)
Geolocation and Data Type Impact on SQL Query Execution Time Using Different Database Approaches
Picking the right database approach together with the database and table definition affects query execution time. Servers are located in different geographical positions, affecting round-trip time (RTT). Four methods for database approach and query execution were used in queries consisted of the same data trying to point the time difference. Most common data structures were tested both for the time difference and the needed storage space. Combining data types and choosing a good database approach in terms of simplicity, security and time needed for execution, saves both space and time. Time and storage problems often occur when operating with large amounts of data which is the case in this paper. Also, along with providing facts and results, best methods for database approach and table optimization in the default database setup are given. Later optimization can be achieved in terms of selecting different database engines for specific needs.
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L. Milić (University of Zagreb Faculty of Organization and Informatics, Varaždin, Croatia), L. Jelenković (FAKULTET ELEKTROTEHNIKE I RAČUNARSTVA, ZAGREB, Croatia)
A novel versatile architecture for Internet of Things
This paper presents an overview of contemporary architectures for Internet of Things and then introduces a novel architecture. The main goal of proposed architecture is to remain simple but still applicable to any Internet of Things environment. Specific applications of IoT should be implemented in application layer, using proposed architecture as backbone. Proposed architecture isn’t yet fully defined, but ideas on which is based are well defined and should provide straightforward design and implementation.
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K. Obarčanin, A. Šečić, N. Hadžimejlić (IBEKO Power AB, Stockholm, Sweden)
Design and Development of the Software Solution for Analysis and Acquisition of the High Voltage Circuit Breakers Dynamic Resistance Measurement results
This paper covers the principles and workflow in the design and development of software solutions for control, acquisition and analysis of the dynamic resistance measurement results for high voltage circuit breaker analyzer devices. Over five years of experience in the creation of necessary algorithms and the development of software solutions for circuit breaker analyzer control and data acquisition systems have been summarized in this paperwork.
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M. Saari, P. Sillberg, P. Rantanen, J. Soini (Tampere University of Technology, Pori, Finland), H. Fukai (Keio University, Kanakawa, Japan)
Data Collector Service - Practical approach with embedded Linux
Nowadays embedded systems are one of the most important application areas in information technology. Embedded systems are often used in life critical situations, where reliability and safety are more important criteria that performance. This paper presents a data collector service that has been developed based on embedded Linux, which operates as a key element in a larger intelligent alarm system. The target of this study was to test out how well a cost-efficient single-board computer can be used to gather sensory data, and how this data can be provided for the client over the public Internet. The paper describes the data collector service currently in use and its functionality and also gives a concrete example of how to utilize a micro-controller with an embedded Linux distribution. The paper presents one solution on how to utilize embedded systems for managing and controlling conditions in buildings and also environmental conditions in a smart and cost-effective way.
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A. Guseva (Innovation Dooel, Skopje, Macedonia), M. Gusev, S. Ristov (Ss. Cyril and Methodius University, Faculty of Computer Science and Engineering, Skopje, Macedonia)
Overview of ICT Technologies for the SMILE concept of Adaptive Stimulating Envirvonment
Several ICT technologies are used in the SMILE project for StiMulating IntelLEctual activity with adaptive environment.
In this paper we give an overview of state of the art of these technologies and discuss possibilities of their integration for realization of a SMILE prototype.
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D. Skvorc, M. Orsic, S. Gros (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Android-Powered Web Server for Volunteer-Based Environment Sensing
Many people today are using smartphones and similar forms of mobile computers in every aspect of their life as a standard and undetachable personal outfit. Besides the significant amount of computing power, storage capacity, and communication capabilities, these devices are equipped with a set of embedded sensors. This makes them not only sufficient for being a reliable on-site assistants, but also powerful enough to deliver sensory information collected from the environment to the remote users through the Internet. Having an open community of smartphone users involved as data sources into the global environment sensing program reduces the need for a dedicated sensory infrastructure preinstalled throughout the environment, yet providing a satisfactory level of territory coverage. The necessary prerequisite is, however, that users can contribute effortlessly, with minimum or no overhead compared to normal smartphone usage.
In this paper, we present a prototype implementation of an Android-powered web server for autonomous capture and delivery of sensory information from a mobile device to the remote users. In addition, we present an extensible software framework that enables seamless integration of new sensors into the web server as new types of devices appear on the market.
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I. Rendulić, A. Bibulić, N. Mišković (Fakultet elektrotehnike i računarstva, Zagreb, Croatia)
Estimating diver orientation from video using body markers
For an autonomous underwater vehicle to be able to accurately track and follow the diver we need a way to estimate the diver's location. This is a common-type task of object detection and can be solved with fairly high accuracy using modern computer vision algorithms.
Estimating the diver's orientation, which is a very useful information for tracking (especially for low maneuverability vehicles), is a more challenging problem. This is especially the case with often poor underwater video quality due to water turbidity and low lighting. These conditions motivate using highly visible markers mounted on the body of the diver, which can be detected even in harsh conditions.
In this paper we explore computer vision techniques of estimating the orientation of a diver based on two familiar visible markers attached to his body. Both mono and stereo cameras are used to obtain the video of the setup and their performance is compared to an IMU-based reference.
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M. Šegvić (Computer2Cockpit, Zagreb, Croatia), K. Krajček, E. Ivanjko (Fakultet prometnih znanosti, Zagreb, Croatia)
Technologies for Distributed Flight Control Systems: a Review
This paper assess the state of the art in distributed flight control technologies using publicly available scientific and technical publications. Technological developments, such as embedded computing and Micro-Electro-Mechanical Systems (MEMS) are enabling advanced aerospace-oriented distributed systems. Distributed systems are comprised of a large number of simple elements, each with its own sensing, actuation and control, in order to obtain the desired behavior. These systems have the potential be more economic than a centralized system due to the simplicity of the individual components, and possibility of using same production unit for different role within the system. The challenge with these systems is the coordination amongst nodes comprising a distributed control network. The challenges are outweighed by the benefits of improved capability and increased robustness through redundancy and inherent fault tolerance. The state of the art summary comprises a description of current flight control systems with a distributed structure, technologies currently used in flight control systems and also technologies not specifically related to distributed flight control but applicable for the design of future flight control strategies. Described system and technologies are represented with examples of real systems including swarms of small Unmanned Aerial Vehicles (UAVs), distributed networks for sensing and structural health monitoring, and fault tolerant flight control systems.
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| Accepted Papers |
O. Kuljaca, K. Horvat (Brodarski institut d.o.o., Zagreb, Croatia)
Describing function analysis of systems with fuzzy compensated odd symmetric nonlinear actuators
Paper deals with fuzzy compensated odd symmetric nonlinear actuators. Most actuators are nonlinear sporting odd symmetric nonlinearities such as deadzone and saturation. One of ways of dealing with such actuators is to try to compensate for nonlinearities by fuzzy systems. Compensated actuators can improve behavior of the system, but then arises the problem of stability analysis because compensated nonlinearity is now complex nonlinearity not described in common literature. One way of dealing with such problem is to perform stability analysis via describing function method. Paper will describe the method for compensating nonlinearities, recording describing function and performing stability analysis.
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L. Jelenković, T. Budrović (University of Zagreb, Faculty of electrical engineering and computing, Zagreb, Croatia)
Simple Day-Ahead Bidding Algorithm for a System with Microgrids and a Distributor
In this paper we present a heuristic distributed algorithm for day-ahead bidding between collection of microgrids that sell their surplus energy to a distributor -- a single operator of the power grid. Each microgrid is modeled as both energy producer and consumer, with energy storage capabilities. Presented algorithm is simple and produces good results from microgrid perspective. Due to model simplicity, produced results aren't always optimal, and convergence had to be additionally helped. In comparison to similar distributed bidding algorithms for systems with storage capacity presented algorithm is simplest and can be used for both day-ahead and for real-time bidding (with input parameter adjustment).
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M. Konecki (Fakultet organizacije i informatike, Varaždin, Croatia), M. Gams (Institut "Jožef Stefan", Ljubljana, Slovenia), N. Ivković (Fakultet organizacije i informatike, Varaždin, Croatia)
MIA: a Multi-Purpose Intelligent Assistant
Business systems as well as corresponding websites are constantly growing in their complexity and it is harder and harder to use them and find desired functionality or information. Intelligent assistants can be used as a mean of enabling users to find information they seek and to get the answers they require in a way that is quicker and more suited for wider types of users compared to traditional approach because they are not required to know the system in detail but rather to communicate with appropriate intelligent assistant in a more natural language which is similar to talking with their colleagues. Intelligent assistants should be as easy to develop and maintain as possible as these are constant activities that are required in order to get the intelligent asistent to provide the latest information. In this paper a multi-purpose intelligent assistant (MIA) is proposed and its architecture as well as the perception of various business systems about the usage of such asistent is presented and discussed.
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M. Konecki, R. Kudelić (Fakultet organizacije i informatike, Varaždin, Croatia), H. Gjoreski (Institut "Jožef Stefan", Ljubljana, Slovenia)
GUIDL IA: an intelligent assistant for aiding visually impaired in using GUIDL
GUIDL (Graphical User Interface Description Language) system has been proposed as an effective aiding technology that enables inclusion of visually impaired computer users into activities of graphical user interface design. GUIDL implements many aiding concepts that make creation of graphical user interfaces suitable for visually impaired. In order to make GUIDL even more accessible to visually impaired a GUIDL IA (intelligent assistant) is proposed in order to provide a more suitable and simpler way of getting help about various parts of GUIDL system. GUIDL IA enables visually impaired to ask questions in the form of natural language compared to browsing through instruction manual which makes getting the right information easier and quicker. GUIDL IA also enables visually impaired to hear the answer through integrated text-to-speech synthesizer that enables more natural pronunciation of given answers. In this paper GUIDL IA is presented and discussed along with the results about its effectives.
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A. Hajdarevic, I. Dzananovic (Thermal Power Plant "Tuzla", Tuzla, Bosnia and Herzegovina), L. Banjanovic-Mehmedovic (University of Tuzla, Faculty of Electrical Engineering, Tuzla, Bosnia and Herzegovina), F. Mehmedovic (ABB Ltd. Representative Office in Bosnia and Herzegovina, Tuzla, Bosnia and Herzegovina)
Anomaly Detection in Thermal Power Plant using Probabilistic Neural Network
Anomalies are integral part of every system's behavior and sometimes cannot be avoided. Therefore it is very important to timely detect such anomalies in real-world running power plant system. Artificial neural networks are one of anomaly detection techniques. This paper gives a type of neural network (probabilistic) to solve the problem of anomaly detection in selected sections of thermal power plant. Selected sections are steam superheaters and steam drum. Inputs for neural networks are some of the most important process variables of these sections. It is noteworthy that all of the inputs are observable in the real system installed in thermal power plant, some of which represent normal behavior and some anomalies. In addition to the implementation of this network for anomaly detection, the effect of key parameter change on anomaly detection results is also shown. Results confirm that probabilistic neural network is excellent solution for anomaly detection problem, especially in real-time industrial applications.
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S. Ravlić (Ravel d.o.o., Zagreb, Croatia), A. Marušić, J. Havelka (Faculty of Electrical Engineering and Computing, Zagreb, Croatia)
Neutral Grounding in Middle Voltage Power Systems: Simulation Model
In middle voltage networks in Croatia there are four neutral earthing concepts: isolated neutral point, low-impedance grounded networks, resonant grounded networks and networks with partial compensation. The paper will generally discuss modelling and simulation software developed for analysis of four grounding concepts mentioned earlier. Model was made using Matlab. Real time simulations were performed to test the behavior of middle voltage networks with different grounding concepts in case when single phase earth faults occur. The manner in which neutral point is treated has a fundamental influence on the value of the current and on overvoltages. The paper will also discuss influences that cable network connected to middle voltage side of network transformer and the moment when a fault occurs have on the value of the current and on overvoltages. Based on the simulation results, the paper presents the possibilities and limitations of various neutral earthing concepts in medium voltage systems.
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M. Pavetić, T. Bjažić (Tehničko veleučilište u Zagrebu, Zagreb, Croatia)
Utjecaj momenta tereta na brzinu vrtnje sinkronog elektromotornog pogona
U ovom radu opisan je sustav dvaju mehanički spregnutih elektromotornih pogona. Primarni elektromotorni pogon je sinkroni s permanentnim magnetima, zasnovan na Siemensovom Sinamics S120 modularnom sustavu, a sekundarni pogon je asinkroni, također zasnovan na Sinamics S120 modularnom sustavu. Na primarnom pogonu projektirani su regulatori momenta i brzine vrtnje, a sekundarni pogon je konfiguriran za promjenu momenta tereta, odnosno za emulaciju opterećenja primarnog elektromotornog pogona. Dana je usporedba odziva na promjenu referentne veličine i momenta tereta za regulator brzine vrtnje sinkronog pogona projektiran prema tehničkom i simetričnom optimumu. Budući da je rad prvenstveno edukativnog karaktera, dane su i smjernice za emulaciju rada radnih mehanizama.
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Z. Lipošćak (HEP-Operator distribucijskog sustava d.o.o., Zagreb, Croatia)
Funkcije naprednih mjernih sustava za električnu energiju
Direktive europske unije 2009/72/CE i 2009/73/CE od 13. srpnja 2009. godine u području naprednog mjerenja zahtijevaju da država članica osigura implementaciju naprednih mjernih sustava koji će pridonijeti aktivnom sudjelovanju kupaca na tržištu električne energije. Isto tako potrebno je provesti ekonomsku analizu dugoročnih troškova i dobiti te pripremiti vremenski plan izgradnje naprednog mjernog sustava u periodu od najviše deset godina. Ukoliko ekonomska analiza pokaže isplativost ugradnje naprednih mjernih sustava za određene kategorije kupaca ili područja primjene, najmanje 80% obračunskih mjernih mjesta je potrebno opremiti naprednim brojilima do 2020. godine.
Zahtjevi europskih direktiva prema izgradnji naprednih mjernih sustava ugrađeni su u hrvatsko zakonodavstvo kroz Zakon o energiji , NN 120/2012 i Zakon o tržištu električne energije, NN 22/2013.
Zakonom o energiji definirano je da operator mreže/sustava utvrđuje tehničke zahtjeve i troškove uvođenja naprednih mjernih uređaja i sustava za njihovo umrežavanje te ih dostavlja Agenciji (HERA). Na temelju podataka Agencija provodi analizu troška i dobiti te pribavlja mišljenje predstavnika tijela za zaštitu potrošača za uvođenje naprednih mjernih uređaja za krajnje kupce. Ministar na temelju analize utvrđuje odlukom plan i program mjera za uvođenje naprednih mjernih uređaja za krajnje kupce, a provođenje odluke nadzire Agencija. Prilikom korištenja naprednih mjernih uređaja nužno je prikupljati, obrađivati i koristiti mjerne podatke u skladu s propisima o zaštititi osobnih podataka.
Od sustava naprednog mjerenja potrošnje električne energije očekuje se veliki doprinos u ostvarenju ciljeva 20/20/20 Europske Unije do kraja 2020. godine; smanjenje potrošnja energije za 20%, smanjenje emisije stakleničkih plinova za 20% i povećanje udjela energije iz obnovljivih izvora za 20%.
Zbog velikih očekivanja i nužnosti zadovoljenja potreba različitih subjekata, vrlo je složen i osjetljiv početni korak utvrđivanja tehničkih karakteristika naprednih mjernih uređaja i sustava za njihovo umrežavanje za potrebe hrvatskog tržišta električne energije. Posebno se preporučuje da sustav naprednih mjernih uređaja podržava barem minimalni skup funkcija predložen u Preporuci Europske Komisije 2012/148/EU, a koje su u skladu s aktivnostima normiranja u ovom području. To je potrebno za osiguravanje tehničke i komercijalne interoperabilnosti u naprednom mjerenju, osiguranje privatnosti i sigurnosti podataka te omogućavanje kreiranja i razvoja novih energetskih usluga.
U radu bi se prikazala razmišljanja i moguće tehničke karakteristika naprednih brojila električne energije i sustava za njihovo umrežavanje, potrebne za nesmetani rad sudionika na tržištu električne energije i kao podrška ostvarenju energetskih ciljeva Republike Hrvatske i Europske Unije.
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A. Burlakov, A. Khmelnov (Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences, Irkutsk, Russian Federation)
The Computer Architecture and Hardware Description Language
The paper introduces CAHDL, a Computer Architecture and Hardware Descriptive Language. CAHDL is aimed to specify processor instructions and computer hardware formally. Although CAHDL supports RTL modeling to some extent, it is does not describe digital circuits. CAHDL is designed first to specify CPU and hardware behavior, rather than their structure. CAHDL can be applied in simulators, compilers, disassemblers, testers and other programs requiring specification of computer architecture. The paper examples some CAHDL syntactic constructions and explain their semantics. Parsing methods are also briefly reviewed. In the end of the paper a simulator developed to approbate the language and to debug specifications written in CAHDL is observed.
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N. Frid, D. Ivošević, V. Sruk (University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia)
Heterogeneity Impact on MPSoC Platforms Performance
Embedded systems have become an integral part of High Performance Computing (HPC) due to their appealing energy and resource consumption characteristics.
Required performance goals can be achieved either through design of a custom made FPGA architecture platform targeting particular application or by exploiting existing of-the-shelf embedded CPUs combined in a parallel heterogeneous architecture. The first approach provides optimal speed performance in most cases, while time/cost efficiency and reusability emerge as problems. The alternative is more time and cost efficient requiring less designer effort, but with possible deterioration in speed performance depending on the efficiency of scheduling and mapping heuristics.
In this paper both approaches are compared on a set of typical applications to discover types of applications which are better suited for each of these two architectures. A complementary approach - combining the best of both worlds in more complex applications is also discussed.
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D. Adzinets, D. Lavnikevich , M. Lukashevich (Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus), Y. Seitkulov (L.N.Gumilyov Eurasian National University, Astana, Kazakhstan), M. Tatur (Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus)
Problem-oriented on tasks Data Mining parallel processor
In this paper the clustering, classification, regression, and associative search are viewed as formal tasks Data Mining. Objects presented in the form of multi-dimensional numerical vectors of informative features are initial data. For each of the tasks exist many known algorithms of solving, but they have fundamental differences. For example, the first group is based on calculation of the distance between the images in a specific metric, the second group is based on approximation of regression or discriminant function, and others are based on analysis and processing of math graphs. These differences are a cause for very narrow application of known neuro-computers and associative processors. At the same time, the universal parallel processors (multi-core CPU and GPU) have objective limitations in accordance with the Amdahl's and Gustafson's Laws, and aren't optimal for solving Data Mining. We propose an approach that unifies hardware and software implementation of the tasks of regression, classification, clustering and associative search through the unification of different algorithms in a unified mathematical model. This opens the way to create of hardware universal core of computation for all tasks Data Mining and Knowledge Discovery, and hence to the creation of a new type of cognitive or intelligent computers.
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T. Erdelić, S. Vrbančić, L. Rožić (University of Zagreb, Faculty of Transport and Traffic Sciences , Zagreb, Croatia)
A Model of Speed Profiles for Urban Road Networks Using G-means Clustering
In this paper, we present a method for computing speed profiles by processing GPS data collected by vehicles in an urban area. The vehicles were tracked during a five year period on the road network of the capital city of Croatia (Zagreb). Traffic congestions in Croatia appear almost exclusively in urban areas, therefore Zagreb was chosen for this study as it is by far the largest city. The roads with a large daily vehicle flow were observed. The profiles for these roads were computed for each day of the week, where each day was segmented into five minute intervals. As there are no congestions during the night, the free flow speed for the roads was determined by averaging vehicle speeds that occurred during that time. The speed profiles were clustered using G-means, a variant of the k-means clustering algorithm, to reduce storage space and to categorize roads with insufficient data or roads not yet examined. By applying this algorithm we reduced the number of total speed profiles by more than 90%. The profiles were developed as part of the SORDITO project, with the goal of developing algorithms for vehicle route optimisations.
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T. Kanduč, B. Rodič (Faculty of Information Studies, Novo mesto, Slovenia)
Optimisation of factory floor layout using force-directed graph drawing algorithm
In this paper we tackle the problem of optimising floor layout in the factory with respect to minimising overall costs. The goal is to find better layout in order to reduce the costs of workers that transport the products between the machines. On the other hand, moving a machine from its original position represents one-time cost that need to be offset by reduction of labour costs.
First we have analysed the current state of the manufacturing system by constructing a detailed discrete event simulation model. The DES model is used to develop optimisation methods and verify modifications needed for process optimisation. From the simulation runs we have obtained all important data outputs to tackle the optimisation process. Afterwards, we have developed a novel heuristic method that is based on force-directed graph drawing algorithms, which produces improved floor layout proposals.
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K. Jurković, H. Pandžić, I. Kuzle (University of Zagreb Faculty of Electrical Engineering and Computing, Zagreb, Croatia)
Review on Unit Commitment under Uncertainty Approaches
Wind power has already become an important renewable energy resource in many regions of the world. Because of its variability and uncertainty, integration of wind power presents a challenge that, if not adequately addressed, can jeopardize the operational reliability of a power system. Generally, generation unit commitment decisions are made once a day, i.e., the commitment decisions are made 24 or more hours ahead of the actual operation. Taking into account the uncertainty of wind power prediction, these decisions need to provide sufficient flexibility at a minimum price. This paper describes the current practice and analyzes unit commitment formulations available in literature highlighting their advantages and shortcomings.
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N. Mijić (EKO EURO TIM d.o.o, Banja Luka, Bosnia and Herzegovina)
Određivanje mjerne nesigurnosti 3D laserskog skenera
3D laserski skeneri nude korisnicima nove mogućnsti za konformniji i efektivniji rad, ali u stručnoj javnosti još uvijek ne postoji konsenzus u vezi ustaljene procedure za testiranje tačnosti i kalibraciju 3D laserskih skenera. Proces određivanja mjerne nesigurnosti laserskog skenera realizovan je u Metrološkoj laboratoriji Građevinskog fakulteta u Beogradu. Test polje za metrološku kontrolu formirano je pomoću 46 crno bijelih signalnih markica. Obrada rezultata mjerenja izvršena je u softverskom paketu MATLAB. Mjerna nesigurnost je određena na osnovu dužine, horizontalnog i vertikalnog ugla lasera.
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D. Budimir, D. Brčić, N. Jelušić (Fakultet prometnih znanosti, Zagreb, Croatia)
Analiza operativnih karakteristika javnog gradskog prijevoza temeljem prikupljanja podataka poretnim osjetilima
Analiza funkcije javnog gradskog prijevoza (JGP-a) i njegovih operativnih karakteristika, temelj je svake optimizacije samog podsustava.
U radu se prikazuje koncept agilnog prikupljanja podataka o prometnim tokovima tramvajskog podsustava JGP-a, te argumentira prilagodba prikupljanih podataka dobivenih pokretnim osjetilima (GPS putanje) u definirani logički model prostornih podataka. Logički model prostornih podataka razvijen je temeljem linearnih referentnih sustava (LRS) koji su ujedno i referenca za integracije s drugim digitalnim podatcima iz okruženja, pa tako i s podacima prikupljanim iz dinamičkog okruženja pokretnim osjetilima (podaci iz realnog prometnog toka).
Na ovaj način dovedeni su podatci u isti prostorni okvir (integracijom prikupljanih podataka s drugim podacima), vodeći računa o odnosima među relevantnim podacima koji su georeferencirani u logički model prostornih podataka (LRS). Stvoren je koncept algoritma, na temelju podataka prikupljenih pokretnim osjetilima, koji na pojednostavljen način (mjerenjem i kompariranjem podataka) kao output daje operativne karakteristike JGP-a.
Istraživanje, koncept obrade i rezultati istraživanja sačinjeni su u sklopu projekta „Razvoj planova održive urbane mobilnosti“, odobrenog i provedenog projekta kratkoročne financijske potpore istraživanju Sveučilišta u Zagrebu, temeljem namjenskog višegodišnjeg institucijskog financiranja znanstvene djelatnosti na javnim sveučilištima.
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J. Ostojić (HAC ONC d.o.o., Zagreb, Croatia), E. Kalajdžić (Enel-Split d.o.o., Zagreb, Croatia)
Optimizacija procesa naplate cestarine na Autocesti Rijeka-Zagreb
Autocesta Rijeka-Zagreb je tijekom 2013. pokrenula nekoliko projekata iz domene unapređenja poslovanja i uvođenja novih poslovnih i organizacijskih rješenja. Obzirom na nužnu potrebu unaprjeđenja poslovnih procesa, prepoznata je poslovna potreba optimizacije poslovnih procesa naplate cestarine.
Poslovni proces naplate cestarine na Autocesti Rijeka-Zagreb, kao jedan od ključnih poslovnih procesa uključuje sve relevantne aktivnosti od trenutka evidencije ulaska vozila na autocestu pa sve do evidentiranja ove transakcije u financijskom modulu SAP ERP sustava.
Cilj projekta „Optimizacija poslovnog procesa naplate cestarine na Autocesti Rijeka-Zagreb“, je bio osigurati transparentnost poslovnih procesa uzevši u obzir cjelokupnu postojeću infrastrukturu tvrtke i sve postojeće uvjete plaćanja cestarine. Jedan od prioriteta projekta je bio i izrada novog, pouzdanog sučelja koji vrši prijenos podataka iz Sustava naplate cestarine u SAP ERP sustav.
Kao potpora unapređenju poslovnih procesa odabrana je platforma ARIS, njemačke firme Software AG. Tijekom analize poslovnih procesa ciljano su se uočavale slabe točke koje su se tretirale kao prigode za poboljšanja, te su na kraju projekta dokumentirano predstavljene zajedno sa prijedlozima na koji način poboljšati i unaprijediti poslovne procese.
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S. Skok (Tehnički fakultet, Rijeka, Croatia), M. Filipović (HEP-ODS, Gospić, Croatia), V. Kirinčić (Tehnički fakultet, Rijeka, Croatia)
Vođenje elektroenergetskih mikromreža na osnovi sinkroniziranih mjerenja
Područje elektroenergetike nezaustavljivo se sve više usmjerava prema tematici naprednih elektroenergetskih mreža (engl. Smart Grid) i mikromreža (engl. Microgrids). Naime, operatori sustava suočeni su sa sve većim izazovima koje nameću ekonomski pokazatelji, odnosno kako sa što manjim ulaganjima u elektroenergetsku mrežu postići što veću “zaradu”. Nažalost, danas elektroenergetski sustav sve više “vode” ekonomisti, raznorazne udruge ili stranke “zelenih” ili pak inozemni vlasnici obnovljivih izvora energije odnosno, lijepo nazvani, tzv. povlašteni proizvođači. Ovaj je rad pokušaj pomoći u vođenju elektroenergetskoga sustava, odnosno rješenja vezanog uz podjelu distribucijskoga elektroenergetskog sustava na mikromreže s integriranim obnovljivim izvorima energije. Rad se posebno odnosi na mogućnost odvajanja mikromreže u otočni pogon te vođenje i nadzor mikromreže u stvarnom vremenu na osnovi već primijenjene tehnologije sinkroniziranih mjerenja fazora napona i struja. Cilj je rada otvoriti pitanja vezana uz primjenu mikromreža, kao i uz moguće izmjene postojećih Mrežnih pravila, te u konačnici odrediti prioritete razvoja u elektroenergetici.
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Basic information:
Chairs:
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)
International Program Committee Chairman:
Petar Biljanović (Croatia)
International Program Committee:
Alberto Abello Gamazo (Spain), Slavko Amon (Slovenia), Vesna Anđelić (Croatia), Michael E. Auer (Austria), Mirta Baranović (Croatia), Ladjel Bellatreche (France), Eugen Brenner (Austria), Andrea Budin (Croatia), Željko Butković (Croatia), Željka Car (Croatia), Matjaž Colnarič (Slovenia), Alfredo Cuzzocrea (Italy), Marina Čičin-Šain (Croatia), Marko Delimar (Croatia), Todd Eavis (Canada), Maurizio Ferrari (Italy), Bekim Fetaji (Macedonia), 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), Yike Guo (United Kingdom), 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), Dragan Knežević (Croatia), Mladen Mauher (Croatia), Igor Mekjavic (Slovenia), Branko Mikac (Croatia), Veljko Milutinović (Serbia), Vladimir Mrvoš (Croatia), Jadranko F. Novak (Croatia), Jesus Pardillo (Spain), Nikola Pavešić (Slovenia), Vladimir Peršić (Croatia), Goran Radić (Croatia), Slobodan Ribarić (Croatia), Janez Rozman (Slovenia), Karolj Skala (Croatia), Ivanka Sluganović (Croatia), Vlado Sruk (Croatia), Uroš Stanič (Slovenia), Ninoslav Stojadinović (Serbia), Jadranka Šunde (Australia), Aleksandar Szabo (Croatia), Laszlo Szirmay-Kalos (Hungary), Davor Šarić (Croatia), 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), Boris Vrdoljak (Croatia), Robert Wrembel (Poland), Damjan Zazula (Slovenia)
Registration / Fees:
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REGISTRATION / FEES
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Price in EUR
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Before May 11, 2015
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After May 11, 2015
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| Members of MIPRO and IEEE |
180
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200
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| Students (undergraduate and graduate), primary and secondary school teachers |
100
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110
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| Others |
200
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220
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Contact:
Vlado Sruk
Faculty of Electrical Engineering and Computing
Unska 3
HR-10000 Zagreb, Croatia
Phone: +385 1 612 99 45
Fax: +385 1 612 96 53
E-mail: vlado.sruk@fer.hr
Opatija - 170 years of tourism:
 Opatija – the cradle of European and Croatian tourism, a favourite destination of the aristocracy, film and music stars, artists, writers and visitors from all over the world, who come here every year to enjoy the charm of this Adriatic town – this year celebrates its 170th anniversary as a tourist resort.
This is a tradition that provides certain obligations, but is also a guarantee of quality. The reputation of a top destination that stretches back seventeen decades is today reflected in the wide range of facilities and services on offer that all together make Opatija an attractive destination for all seasons.
Opatija owes its unique image to its ideal location on the spot where the wooded slopes of Mount Učka descend all the way down to the coast, providing perfect shade along the thirteen-kilometre-long Lungomare seafront promenade. Just as the Opatija area is a meeting point of the sea and the mountain, its visual impression is a blend of different styles, as this is a melting pot where magnificent Central European elegance, playful Mediterranean charm and the historically-rich medieval architecture of the small towns in the hinterland come together.
In addition to the architecture that leaves a strong impression on every visitor, especially when the town is viewed from the sea, and its lush parks and gardens that have been Opatija's trademarks since its beginnings as a tourist resort, Opatija also has hotels and restaurants whose quality ranks alongside that of any other European destination. Opatija's gastronomic offer is based on a Mediterranean cuisine rich in fresh fish and seafood and locally grown seasonal ingredients, while the traditional recipes of this region reveal a wealth of flavours and can be sampled in the area's numerous taverns.
Opatija entered the European stage in the mid-19th century as a health resort for the European nobility, and health tourism has remained one of the main segments of the town's tourism offer right up to the present day. However, top medical experts and a wide range of spa & wellness services are just one of the reasons for visiting this town located at the top of Kvarner Bay. Also known as "the town of festivals", Opatija boasts a number of events throughout the year. The theatrical performances and concerts that take place at the magnificent Open Air Theatre are particularly impressive.
For more details please look at www.opatija.hr/ and www.opatija-tourism.hr/.
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