737 papers found .

701. The NFO Investment Assistant Based on Aided Labeling and Orchestration of Multiple Statistical and Deep Learning Information Extraction Models

ICIST 2022 Proceedings, 162-167
Perić Ivan, Perić Radana, Ghale Doma, Kondić Miroslav, Anđelić Stefan
Abstract: A new fund offer (NFO) is the first subscription offering for any new fund offered by an investment company. A new fund offer occurs when a fund is launched, allowing the firm to raise capital for purchasing securities. Investors can research new launches of funds either by monitoring various investment companies' press releases or by checking NFO-related news aggregate sites. In this paper, we propose an automated digital twin model for NFO detection by using the NLP/NLU models combined with scoring metrics to optimize the model performance. Additionally, we propose an approach to use these models without any labeled data, while creating a model evolution pipeline through investor involvement and feedback, enabling the digital twin to evolve through time and improve NFO alerting quality.

702. Novel approach to generic parametrized lattice scaffold model design

ICIST 2022 Proceedings, 168-171
Turudija Rajko, Aranđelović Jovan, Stojković Miloš, Korunović Nikola, Stojković Jelena
Abstract: In order to create a personalized scaffold design, multiple data and information are needed: 3D scan of the bone, load conditions, placement of the scaffold in relation to the part of the bone that must be recovered/healed etc. Besides previously mentioned prerequisites for scaffold design, certain global guidelines should be observed in order to achieve desired scaffold mechanical properties: difference in results between the numerical analysis and mechanical testing of the scaffold (determined as percentage), trends that indicate how changes in geometry affect the mechanical properties of the scaffold (determined by structural optimization), etc. Some of previously mentioned guidelines were observed by multiple researchers through the development of generic or personalized scaffold designs, which can be used for mechanical or finite element analysis testing, but up to this point, no studies have produced a generic lattice scaffold model that can be used for structural optimization. Because of this, the goal of the study is to develop a flexible and robust parametric model of a generic lattice scaffold design that may be used in structural optimization. Parametric scaffold model developed in this study is meant for long bones recovery/healing and is in tablet form (with flat tops and bottoms) so that it can be used more easily in mechanical testing. It can change the diameter, density, and angle of its struts, with the possibility to modify its overall dimension at the same time, making the model flexible and robust (thus applicable to structural optimization).

703. Utilizing AHP for smart-city development with blockchain-based solutions for Healthcare, Government and Education

ICIST 2022 Proceedings, 172-175
Simjanović Dušan, Zdravković Nemanja, Ranđelović Branislav, Vesić Nenad
Abstract: Smart cities use information and communication technologies (ICT) in overcome many challenges in order to have sustainable development. Overcoming these challenges can be achieved by applying certain criteria, which can ultimately lead to the urban transformation of urban areas, with the aim to provide better services to its dwellers, and also to ensure efficient and optimal utilization of available resources. As disruptive ICT-driven technologies such as Internet of Things (IoT), big data, artificial intelligence (AI) and blockchain are generally considered key drivers in smart city progress, the decision making process in development can be indeed cumbersome. In this paper, we apply analytic hierarchy process (AHP) to perform a multi-criteria analysis for planning the development of smart cities, and focus on one of the disruptive technologies, namely blockchain-based solutions. Constructed to ensure the aid in re-solving the decision-making problems, and itself being a part of multi-criteria analysis, the AHP method is used to provide the most adequate solution and rank sub-criteria by its importance. Our results focus on solutions in the areas of healthcare, education, and government, three of six basic criteria groups that determine a smart city, and we consider different types of blockchain technologies.
Abstract: Obtaining a 3D surface model of the human pubic bone with sufficient accuracy is a difficult task due to its complex geometry. The task can be further complicated by the fact that some parts of the bones are often missing or damaged, resulting in the lack of complete volumetric data. Therefore, our idea is to create a parametric pubic bone model as the base for building 3D surface model with optimal number of parameters, using prediction techniques and artificial neural networks (ANN). The study is conducted at the sample of 32 polygonal models of the male right pubic bone. At the each bone 9 anatomical landmarks are located, and 12 parameters as linear distances between these landmarks are determined and their values are measured on the samples. These values represent the dataset from which different combinations as input and output variables are taken. Three-layer back-propagation architecture of Neural Networks (NN) is chosen, with 1, 2, 3 or 4 neurons in the input layer, while the hidden layer has 5, 10 or 20 neurons. Levenberg - Marquardt (LM) and Bayesian Regularization (BR) algorithm are used for training 15 different NN architectures. Correlation coefficients and Mean Square Errors as performance indicators for all NN architectures are measured and compared with the aim to select optimal number of input parameters and optimal NN architecture. The best results are obtained for 3 input parameters (d1, d3 and d4), 5 neurons in hidden layer and BR training algorithm. The results of the study show that it is enough to localize 4 points and to measure the values of only 3 parameters, in order to get subject specific predictive bone model.

705. Tracking metadata changes in the government open data portals

ICIST 2022 Proceedings, 180-184
Frtunić Gligorijević Milena, Bogdanović Miloš, Stoimenov Leonid
Abstract: Due to the transparency and open government initiatives, a large amount of open government data has been published on the open data portals. In order to provide data reusability, open data portals have different search mechanisms which depend on the quality of datasets metadata. Therefore, within this paper we present the results of the analysis of metadata changes on 40 government open data portals over a two year period. One of the main dataset search resources on the open data portals are datasets categories and tags used for datasets description. Therefore, the focus of our analysis is on tracking changes in the number of datasets on the portals, and changes that consequentially occurred in categories and tags available on the portals. We present different valuable results that can be used for tracking the trend of metadata changes and growth of the metadata that can affect their findability.

706. A comparative overview on Blockchain-based applications for Software Engineering

ICIST 2022 Proceedings, 185-188
Dimitrijević Nikola, Zdravković Nemanja, Milićević Vladimir
Abstract: In less than a decade, blockchain technology has seen a rise in popularity due to its innate security properties and overall disruptive potential. Surpassing its initial use in fintech and cryptocurrencies, blockchain and similar distributed ledger technologies have been used in healthcare, supply chain management, and within the public sector. However, recent studies show that blockchain-based technologies have found uses in software engineering (SE) as well. Namely, blockchain technologies can be used in all phases of the Software Development Life Cycle - software requirements, the engineering/development process, software testing and quality assurance, as well as software maintenance. In this paper, by utilizing existing literature regarding blokchain technologies and SE, we provide insight on which type of blockchain technology could be beneficial for each of the use-cases in SE, highlighting the advantages and potential disadvantages. We discuss various consensus mechanism support, smart contracts technology, as well as storage solutions, tu finally give recommendations for identified use-cases.

707. Introducing the concept of digital twin into dam safety management

ICIST 2022 Proceedings, 189-192
Milivojević Vladimir, Radovanović Jovana, Ćirović Vukašin, Milivojević Nikola
Abstract: Dams are vital infrastructure objects which must be maintained properly to avoid catastrophic failures or major accidents. Recent development of dam monitoring systems capabilities provides massive datasets that are overwhelming for traditional approach to dam safety analysis, which usually relies on expert’s abilities to identify and undertake necessary measures in a timely manner based solely on observed variables. In most cases, the variables that may not be directly measured are of the biggest importance for structural safety (e.g., damage criticality, load capacity, etc.). These variables can be estimated using various numerical methods, such as finite-element method. The concept of “digital twin” applied to dam structures provides tools for the experts to assess various safety parameters of the dam in near real time by coupling numerical methods with live data from monitoring systems. This paper presents development of a dam safety management system, which serves to improve the maintenance, safety, and functionality of a dam. Dam safety management system is based on elaborate monitoring system and detailed FEM models of the dam and power plant which are used to provide estimations of structural behavior and implementation of various “what-if” analysis. The system also uses MLR models of various dam responses for quick checks of observed values. The integration of data from monitoring system with FEM and MLR models is achieved through efficient data management framework. Quality control of data is performed through fully automated process to provide inputs for data assimilation in numerical models. This way a digital twin of the dam is created that is used for dam safety assessment and evaluation of reactive and proactive measures.

708. Haptic user interface for biofeedback in aquatic sports: A design concept

ICIST 2022 Proceedings, 193-197
Hribernik Matevž, Kos Anton, Umek Anton, Sodnik Jaka
Abstract: This paper focuses on a problem of providing real-time biofeedback to a swimmer through a haptic user interface. This interface is integral part of a special wearable device that can be used during swimming. Wearable devices have been proved to be very efficient for providing feedback during various activities, including sports and particularly swimming. We considered several modalities for this interface and finally decided for the haptic modality as it has not been studied in this context before and can, according to our experiences, provide promising results. The proposed haptic biofeedback interface consists of a wearable device attached to the swimmer's lower back and equipped with sensors, a processor, and vibrotactile motors in the belt. The selected hardware configuration allows multiple modes of operation depending on the requirements of the biofeedback application. The wearable device is designed to be part of a larger biofeedback system or to be operated independently.

709. Business context-based approach for Digital Twin services integration

ICIST 2022 Proceedings, 198-202
Jelisić Elena, Janković Marija, Ivezić Nenad, Kulvatunyou Boonserm, Kehagias Dionysios, Marjanović Zoran
Abstract: Digital Twins (DTs) are among the most popular and quickly evolving technologies, particularly within Industry 4.0. The rapid expansion of a new generation of information technologies, such as the Internet of Things (IoT), artificial intelligence (AI), and cloud computing, results in new requirements for DT modeling. Consequently, a five-dimensional DT model is emerging, focusing on servitization, but with limited consideration of standardization for integration of the services. In this paper, we propose a new, business context-based approach that enables accurate and fast integration of DT services, contributing to the standardization of DT integration specifications. Furthermore, we present an initial validation result from the aerospace domain. Keywordsdigital twin; services integration; business context.

710. Extending RCA algorithm to consider ternary relations

ICIST 2022 Proceedings, 203-209
Leutwyler Nicolas, Lezoche Mario, Panetto Hervé, Torres Diego
Abstract: Relational Concept Analysis (RCA) is a multirelational data mining method that aims to extract knowledge from multiple formal contexts (i.e., objects, attributes, and a binary relation between them) and the relations between them. One of the problems RCA has is the lack of the possibility of extracting knowledge directly from data that is represented with ternary relations. While there are some existing solutions towards this problem, either they require complex preprocessing of the input data, or they lose some capabilities of RCA such as the different meanings of the relations between concepts (∃, ∀, etc). In this work, we present an intuitive extension to RCA to be able to use it with data directly represented with ternary relations. As an example of its usage, we apply it to a dataset called Knomana which includes ternary relations.

711. Defining functional requirements for computer-based tests for assessing the psychological response of athletes to acute stress and early detection of overtraining

ICIST 2022 Proceedings, 210-213
Mitrović Vladimir, Mitić Petar, Mišić Dragan, Dopsaj Milivoj, Kos Anton, Trajanović Miroslav
Abstract: Coping with acute stress in sports and overtraining syndrome are extremely important concepts related to sports success. The aim of this paper is to consider the possibility of development and validation of tests within an online platform OpenClick that would assess these phenomena of athletes. Such tests would be reliable, fast, simple, undemanding, but above all, they would provide quality and usable information to coaches and athletes.

712. SMART2M Digital Platform as the Communication Channel for Academia - Industry Collaboration

ICIST 2022 Proceedings, 214-217
Mitrevski Nikola, Ilić Đorđe, Marković Jelena, Šušteršič Tijana, Živić Fatima, Grujović Nenad, Filipović Nenad
Abstract: This paper deals with the concept of digital platforms that serve as the online collaboration channel. We have created the SMART2M digital platform for innovations, http://innovate.smart2m.eu/, to facilitate the solution of challenges and different competitions that may be used by the academia, as well as the industry. The detailed description, accompanying content and specification will reinforce the concept of approving the solution, which can be a solution to homework in case of academia, or the actual product, technical solution or service in case of industry. Academia can reward the students with points for a successfully submitted solution, while organizations can offer monetary incentives or cooperation agreement for the winning ideas. Challenges are presented to a wide group of solvers as a public Call to solve problems - innovate. Users who represent potential solvers send ideas to the entities that published the problem. The final solutions are owned by the entity that announced the Call, or can be further negotiated with the applicants through the direct connection.

713. Automatic Recognition of Personal Data in Textual Documents

ICIST 2022 Proceedings, 218-221
Dragutinović Đorđe, Čapko Darko, Marković Marko, Gostojić Stevan
Abstract: This paper presents an application used to recognize personal data in textual documents written in Serbian and English languages. Recognition is performed using SpaCy and Classla named entity recognition models. The results of personal data recognition are presented and analyzed. Keywordspersonal data, named entity recognition, SpaCy, Classla

714. Towards Local Cloud Infrastructure in Developing Countries as a Response to Data Localization Regulations

ICIST 2022 Proceedings, 222-226
Inđić Vladimir, Kovačević Marija, Simić Miloš, Sladić Goran
Abstract: Successful application of data localization laws is possible only if the country has an IT infrastructure mature enough to store all sensitive data, which is usually not the case in developing countries. This paper proposes a model for building local cloud infrastructure in developing countries compliant with data localization laws. The infrastructure will be developed gradually by adding location-aware commodity hardware nodes placed within the country’s borders over a more extended period. Each node is considered a volunteer for a period defined by the participation policy. This kind of policy describes the formation of a cluster of geographically close nodes that might all be disposed of and replaced after the defined period expires. The government authorities take responsibility for motivating national universities and firms that do business inside the country’s borders to take the key role in provisioning computing and storage nodes for a more extended period specified by the participation contracts and policies. In return, authorities guarantee a set of benefits such as tax reductions and funds for R&D. The authorities should make laws and regulations that follow the gradual development of the local cloud infrastructure by introducing soft data localization first. Hard data localization will replace soft data localization at the moment of infrastructure maturity. Keywordslocal cloud infrastructure, developing countries, data localization regulations, data localization laws, location-aware nodes, participation policies, participation contracts
Abstract: This paper tackles the problem of handwritten mathematical expressions recognition using an algorithm from the field of optical character recognition. The segmentation of mathematical symbols was done with the help of numerical methods of vertical and horizontal histogram projections while for the classification of characters, a convolutional neural network was used. Measurements were done on CROHME’s 2011 competition database, but the neural network was trained using Kaggle’s database of math symbols. The success rate of the algorithm appears in Levenshtein distance and in the number of correct predictions. The neural network reached a success rate of 18%, while on the same database without symbols like sin, cos, tan, i, j, ..., and ÷ 30% was reached.

716. Challenges and techniques for code protection in a distributed environment

ICIST 2022 Proceedings, 232-235
Pesovski Ivica, Zdravkova Katerina
Abstract: The digital transformation is impacting every aspect of our everyday life. The recent social-distancing and isolation measures accelerated the migration of many very traditional processes to online operation. Different vendors develop their own applications for diverse purposes, which expose end-users to significant security risks. Source code protection is crucial for making the internet world a secure environment. This paper discusses code obfuscation, white-box encryption, tamper-proofing, and diversification techniques. The recommendations and discussions in this article contribute toward ensuring a secure digital world. Following them and comprehending their advantages and disadvantages will enable the delivery of code that end users will trust and use.

717. Network dynamics of the online chess platform Lichess: A social network analysis case study

ICIST 2022 Proceedings, 236-239
Obradović Predrag, Mišić Marko
Abstract: This paper is interested in unraveling the dynamics of a network of chess players constructed by observing 20 000 online chess matches played on Lichess.com. A complex network of players is built based on match data and social network analysis techniques are applied. The results are compared to over-the-board chess and other previously studied online chess platforms, to determine if and how the differences in implemented matchmaking algorithms impact network structure and topological properties of the network models. We show that the Lichess social network follows a power-law degree distribution and is not a small world network. It is highly disassortative and clustering is weakly expressed, making Lichess.com more similar to other online chess platforms than over-the-board chess. We employ assortativity analysis to explore the correlations between the difference in player ratings and show that the matchmaking algorithm remains fair, matching players of vastly differing skill level in less than 3% of the matches.

718. An application of graph neural networks for stock market data

ICIST 2022 Proceedings, 240-243
Radojičić Dragana, Radojičić Nina
Abstract: This research is developed in order to describe the behavior present in the market and Limit Order book dynamics, using the concepts of supervised and unsupervised learning. The main mathematical object of interest is the limit order book, whose job is to keep track of all incoming and outgoing orders. There is a wide variety of possibilities to be explored for how to use machine learning techniques to get insights into market behavior. More precisely, in order to develop a statistical arbitrage strategy, the leverage of machine learning techniques can be employed. Furthermore, the concept can be enhanced with the feature that interprets the relationship of different features previously extracted from the limit order book data. The main idea is to employ a Graph Neural Network in order to describe the relationship between different features, and that relationship can be seen as a new feature that is potentially informative and possesses the power to uncover hidden and unknown knowledge from the data set. This work studies the ability to use Graph Neural Networks in order to get more insights from the stock market data. More precisely, this work investigates the ability to use Graph Neural Networks to label the stock market data into one of the labels from the set S={sell, buy, idle}. The obtained results are examined by using the F-score measure and compared with the results obtained by using the recurrent neural networks. This study discusses the potential for using GNNs for stock market data.

719. A review of machine learning methods applied in smart machining

ICIST 2022 Proceedings, 244-246
Barać Milica, Vitković Nikola, Mišić Dragan, Stojković Jelena
Abstract: The transition to clean (green) production is one of the biggest topics facing the whole world. The manufacturing industry is a major polluter, so any effort to reduce pollution is welcome. Smart sustainable production with minimal pollution and energy consumption is no longer just an idea, but a necessity. Smart production include state-of-the-art technologies such as the Cyber-Physical Systems, Big Data, Cloud Computing, Internet of Things and Artificial Intelligence. The aim of this paper is to find and analyze the application of machine learning methods that are mostly used to optimize manufacturing processes with a greater focus on machining processes, i.e., turning and milling processes. The paper gives a brief overview of machine learning methods that have been identified as the most used in data processing for machining processes optimization.

720. UAV system assistance in hazardous materials transport applications

ICIST 2022 Proceedings, 247-250
Milošević Maša, Cvetković Aleksandra, Ćirić Ivan
Abstract: Prevention of traffic accidents in transport using new technical achievements is one of the main topics in academic and industrial circles, especially due to the accelerated development of autonomous vehicles. Special attention is paid to the safety of transport of hazardous substances, such as hazardous waste. This paper describes one of the methods to improve communication between vehicles and vehicles and infrastructure in order to reduce traffic accidents during the transport of explosives and toxic substances. The possibility of complete monitoring of the transport of dangerous goods using Unmanned Aerial Vehicles (UAVs), which also enable communication between vehicles in areas of poor or no network signal coverage, is discussed. Simulation results indicate the reduced interrupt probability of communication in the network with UAVs.


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