Michal Greguš

Michal Greguš
Comenius University Bratislava · Department of Information Systems

RNDr. PhD.

About

51
Publications
50,098
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526
Citations
Citations since 2016
32 Research Items
497 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120

Publications

Publications (51)
Article
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To solve the problem of energy efficiency of modern enterprise it is necessary to reduce energy consumption. One of the possible ways is proposed in this research. A multi-level hierarchical system for energy efficiency management of the enterprise is designed, it is based on the modular principle providing rapid modernization. The novelty of the w...
Article
A small data approach is an important area of research in the medical field. Many tasks in this area require the development of such direction due to the high cost of obtaining dataset or the inability to obtain sufficient observations for the analysis. Intelligent analysis of small datasets, which are very common in this area, will improve the qua...
Article
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An electronic method of protection for printed documents based on which latent elements are formed in a printed way has been developed. The development of security features has been done electronically. Protection using latent elements has been improved by overlapping fractal grids, which allows creation of graphics traps. The printing of designed...
Chapter
In this paper, we propose a new committee-based method for insurance data analytics problem. The main idea of the method is to increase the prediction task’s accuracy. The division of the dataset into segments using dichotomy approach are performed in accordance with the developed algorithm. Both the Kolmogorov-Gabor polynomial and the neural-like...
Chapter
This paper describes the developed SGD-based Wiener polynomial approximation method for the missing data recovery of air pollution monitoring tasks. The main steps of algorithmic implementation of the method have been described and the necessity of a combination of both of these tools is substantiated. The basic parameters of the method (the degree...
Chapter
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In the paper, a new method for solving the multiple linear regression task via a linear polynomial as a constructive formula is proposed. It is based on the use of high-speed SGTM Neural-Like Structure. This linear non-iterative computational intelligence tool is used for identification of polynomial coefficients. As a result of the implementation...
Article
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This article considers the current problem of investigation mobile application and development of mobile system for medical recommendations. The article develops a method for the selection of constituent elements for constructing a text template. The text block pattern is described using Bukus-Naur notation. An algorithm for fuzzy duplicate searche...
Article
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This paper presents the structure of the advisory system for cyclists LvivBicycleMap. The developed system uses the modular principle that allows quick upgrading. The constructed algorithm and model are based on Petri networks theory, which allows to investigate the dynamics of the designed system. The Java language is used to implement the softwar...
Article
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Protecting images from unauthorized access and use is an important task in various areas. The problem of unauthorized use of images is solved at different levels: from the provisions on copyright, to methods of cryptography and steganography, digital watermarking etc. The paper considers a new, authors-developed approach to encryption-decryption of...
Article
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The article covers the formalization of time-dependent and time-independent data of various origins of the investigated object, which are necessary for personalization of patient’s data in the process of seeking an individual approach to choosing a treatment strategy. This allowed to simulate the warehouse of the state of the object being studied i...
Article
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This paper considers the actual problem of Big Data analysis of medical information. Big Data is characterized by heterogeneity and constant growth requires the use of non-standard approaches to storage and processing of data. The analysis of personalized medical information for system development is proposed. The methods of construction of patient...
Article
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The method of image transformation based on fractal geometry is developed. The method is based on building an image based on the Hilbert curve. The image is based on the principle of conformity of the contrast of the image of the filling density of the plane with lines. The mathematical substantiation of the method is given. The corresponding softw...
Article
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Missing data is a typical problem for many hands-on tasks and researches, which has required human intervention and contributed to an increase in errors during algorithms application that demand for a large number of metrics. Solving this particular problem is essential for medicine and healthcare, because it allows more easily diagnosing certain t...
Article
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The search for dependencies that exist between a plurality of state parameters of the constituent elements of a biological system is an important task for its diagnosis. An integral indicator of the body’s status as a biosystem is the weight, the changes of which often correlate with the processes occurring in this organ. Using the Spearman’s rank...
Chapter
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Student mobility programs allow students to travel abroad and to attend part of their studies on foreign academic institutions learning to know other countries, cultures and people. It enhances personal development with priceless experiences and provides a unique opportunity to interact in international and multicultural environment. Yet, study exc...
Chapter
The service sector is closely related with the technology developments and consequently the access to services, their provision, and consumption are optimized. The banking industry is no exception to it. It is strongly influenced by technology developments and tries to meet new challenges and thus to develop further itself. Particularly affected an...
Chapter
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Globalization has changed the economy of the whole world: today, products are being transported all over the globe to arrive at the place of sale whereas before many articles, food and drink products in particular, were mostly supplied by nearby producers. Goods often cover distances over the whole continent or even across oceans by travelling to t...
Conference Paper
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The development of information and communication technology (ICT) changed the world irreversibly and created new innovative ways of processing. Nowadays, people interact through social networks that allow creating and maintaining connections with their peers, relatives, colleagues, friends or partners. Social networks alternated the way people comm...
Article
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Nice (July 14 2016), Berlin (December 19 2016), London (March 22 2017) and Stockholm (April 07 2017) – these four European metropoles are marked by a common occurrence burnt deep into the souls of all European citizens: recent terror attacks made by cars injuring several accidental people passing by. These attacks shall cause fear across Europe whe...
Conference Paper
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In current digital era, people are staring at their smart phones all the time: checking newest posts and messages of their connections in social network sites. At the same time, global attacks and armed accidents representing menace to public safety occur with continuously increasing frequency. In such times, it is important to use all possible com...
Article
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The emergence of information and communication technology changed the world irreversibly through penetrating every facet of our lives. It enables interactive communication in real time with immense number of end users across time and space and allows processing of huge number of requests at the same time. In times of continuously growing expectatio...
Conference Paper
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Emergence of digital technology, especially the information and communication technology (ICT), created new ways of processing that augmented the physical reality by creating one common virtual space for collaboration across time and distance. The pene-trance of virtual teaming into all facets of business operations and processing changed the busin...
Article
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Complete complementary codes represent special group of codes with unique properties, which were not detected for any other codes. These codes found a wide application in several science areas with the broadest application possibilities in telecommunications. This review paper analyses the applications of these codes proposed so far and aims to pro...
Conference Paper
Full-text available
https://www.esd-conference.com/upload/book_of_proceedings/Book_of_Proceedings_Zagreb_2016_Online.pdf https://www.bib.irb.hr/849739/download/849739.Book_of_Proceedings_Zagreb_2016_Online_2.pdf#page=109 The emergence and rapid development of information and communication technologies revolutionized the way of life known so far and created completel...
Conference Paper
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The information and communication technology (ICT) has been evolutionary changing the known way of working and living through interconnecting people across time and space and enabling globalization. The revolutionary development of ICTs enabled the global information exchange to increase in volume and speed rapidly and continuously during last deca...
Conference Paper
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Standard workday today includes use of software applications that enable faster task processing and can do so for several tasks in parallel for us. Still, also the best applications can stop working or may not work correctly. For investigating such unintended malfunctioning of a software application, logging is very important. By examining applicat...
Conference Paper
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Researchers focusing on code division multiple access devote significant attention to complete complementary codes. The reason for the interest on these codes lies in the unique ideal overall correlation properties of these codes that no other codes dispose of. These ideal overall auto-correlation and cross-correlation allow concurrent transmission...
Conference Paper
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Complete complementary codes attract the attention of researchers thanks to their unique ideal correlation properties. Still, the boarder on maximum number of signatures is limiting. Quasi orthogonal complete complementary codes allow higher maximum number of signatures in exchange for a slight loss of some ideality of correlation properties. This...
Article
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The way of working has significantly changed over the past century. Before, people were working in manufactures executing the same task each day. With the industrial revolution the composition of working changed significantly. The evolution went from individually executed tasks to tasks executed in teams. Team work represents the future of working....
Article
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The enterprises need to react promptly and efficiently to any technological or economical demand, despite the fact that globalization causes different-nature challenges nowadays. One of the main technical issues is complicated heterogeneous systems. Mainly, these systems have grown over years, and caused different technological and economic problem...
Conference Paper
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As novel forms of crowdsourcing emerge on the market, we emphasize that the important aspect of location-dependency is more complex than assumed and, thus, suggest a typology along two dimensions of locality: the first dimension refers to whether or not the crowdsourcees interact while being collocated or dispersed; the second dimension refers to t...
Conference Paper
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This paper deals with the future development of cloud computing. A detailed SWOT Analysis examines the most important factors to be considered for the future of cloud computing. Based on the outcomes, the real value of cloud computing is discussed, followed by the challenges for the future development of cloud computing. Those points finally lead t...
Conference Paper
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The Business today is powered not only by structured data but increasingly important role is played by information that is unstructured, social and distributed via different channels. Subject of this communication is mainly related to the organization or its products, services, and employees. Channels include blogs, social media, emails or customer...
Article
In the following work we analyze how the negotiation support systems could assist the parties in reaching an integrative agreement. It is analyzed if the electronic systems could enable overcoming the problem of insufficient information and with it, imperfect solution. The same would be the case in eliminating human error and extending the negotiat...
Article
Mobile business refers to all kinds of business activities, which are performed with the help of mobile devices on networks and the internet. The term 'mobile' implies an anytime access to business processes from mobile appliance. Mobile business is characterised by a large number of uncertainties especially in the sectors of technology, strategy a...
Conference Paper
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Due to their technological complexity, traditional software development paradigms are not appropriate to face the challenges in the modern Web 2.0 world. Having the ability to adapt rapidly to the fast changing Web in an open environment, and challenged by the need for applications to be flexible, Service-Oriented Architecture (SOA), Service-Orient...
Conference Paper
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This paper attempts to explain the concept of servitization in order to declare and emphasize its capabilities in being an influential strategy that provides competitive advantage in manufacturing industries. This is conducted by a detailed elaboration of its notion and origins in the literature as well as the characteristics and processes regardin...
Article
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Modern service enterprises are challenged by a strong competition and dynamically changing business environments. Consequently, the precision of the business requirements identification and rigorous planning regarding investments to information technologies play a key role in the implementation of new capabilities. As the business today is more and...
Article
Today’s economic environment including commercial as well as non-commercial environments requires from suppliers cost effective services. The debates regarding this topic are presenting different strategies. In the first group are supporters of traditional technology including internal solutions with low level of flexibility. On the other hand we h...
Article
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The main challenge about dealing with servitization arises from the fact that one has to consider several diverging research disciplines, comprising of service science, manufacturing and operations management equally. Besides, contemporary economic environments are influenced by rapid development of information and communication technologies in dif...
Article
Business environment becomes harder and faster and needs more sophisticated technologies to enable simultaneous brainstorming, which means for collaboration team members more travelling and therefore increase in time and money. Besides, the massive development of the mobile technologies has been influencing extensively inter/intra enterprise collab...
Article
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The paper evaluates the innovative capabilities as well as change management potential in a large production company. The paper undertakes to analyse the impacts in shift to different organizational structure accompanied by a massive restructuring and downsizing. In the conclusion we propose an action plan for reducing identified barriers to enhanc...
Article
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Strategic role of information systems plays in contemporary management a key role in today's global, dynamical and highly competitive environment. In this paper we identify a strategic information system (IS) issues in an organization. We critically analyze and evaluate the organization's practice to solve the problems connected with the implementi...

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