Tomas Bata University in Zlín
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Comprehensive benchmarking of knowledge graph embeddings methods for Android malware detection
Get PDFThe rising popularity and open-source model of the Android operating system has made it a main target for attackers creating malware applications. With the mobile industry being an expanding device ecosystem, there is a critical need for developing effective methods to protect against mobile malware. Recognizing the latest approaches and their limitations, we have conducted a comprehensive empirical analysis on the applicability of knowledge graphs for malware detection in view of the influence of the scoring functions, the vector dimension, the stability of the obtained results, the performance of the individual classifiers, and other important time dependencies. In addition, we propose a knowledge-graph based method aimed at improving the quality of classification input data, while offering greater interfacing capabilities with external knowledge and lower computational complexity. The proposed method offers a new perspective on working with Android malware, demonstrating a unique data processing pipeline for malware sample identification and encouraging further innovation in the field. Our findings demonstrate that knowledge graph representation is not only feasible, but also provides well-performing results, remaining competitive with state-of-the-art approaches.Fakulta aplikované informatiky, Univerzita Tomáše Bati ve Zlíně, FAI; European Commission, EC; Univerzita Tomáše Bati ve Zlíně, UTB; Tomas Bata University in Zlín, TBU, (IGA/CebiaTech/2023/004); Tomas Bata University in Zlín, TBU; The Slovenian Research and Innovation Agency, ARIS, (P2-0098, P2-0037, GC-0001); The Slovenian Research and Innovation Agency, ARISInternal Grant Agency of Tomas Bata University [IGA/CebiaTech/2023/004]; Faculty of Applied Informatics, Tomas Bata University in Zlin (ailab.fai.utb.cz); Tomas Bata University's Erasmus+ program; European Union; Slovenian Research and Innovation Agency through program [P2-0098, P2-0037, GC-0001
Bitcoin-to-gold ratio and stock market returns
No full textUsing linear and quantile regressions and daily data covering August 7, 2015, to December 30, 2024, we show that the ratio of Bitcoin-to-gold (BG) prices exerts a significantly positive effect on U.S. stock returns during the COVID-19 pandemic and post-pandemic periods, which holds when accounting for volatility, term spread, default spread, inflation, and liquidity. No significant impact is observed in pre-pandemic. To provide more economic explanations, we reveal that the significant impact of the BG ratio on stock returns during and post-pandemic stems from the channel of risk aversion (appetite). When Bitcoin is replaced with Ethereum, the results remain robust
Timing matters: How pre- and post-holiday promotions affect fresh and frozen product sales in grocery retail
Get PDFThis study investigates the impact of promotional timing on fresh and frozen product sales during holiday periods within the supermarket sector. Using a comprehensive dataset from an Austrian retail chain, spanning six years and over 19 million transaction lines, the research highlights the critical interplay between promotional strategies, consumer purchasing behavior, and product perishability. The findings reveal that pre-holiday promotions are particularly effective for fresh products such as fruits, vegetables, meat, and fish, leveraging consumer urgency due to store closures and perishability. In contrast, frozen products exhibit more stable sales patterns, with less pronounced effects from promotional timing due to their suitability for stockpiling. The analysis emphasizes the importance of tailored promotional strategies. Five key implications emerge: the necessity of timing promotions for fresh products to capitalize on consumer urgency, the reduced sensitivity of frozen products to promotional timing, the effectiveness of promotions for high-frequency items in driving sales and traffic, the importance of customizing promotions by product type and leveraging deal intensity, and the critical role of accurate forecasting to minimize waste, particularly for frozen goods. These insights contribute to both theoretical understanding and practical strategies, offering retailers actionable recommendations to enhance sales performance, optimize inventory management, and reduce wastage during holiday periods. The study also highlights avenues for future research, including product-level analyses and the exploration of consumer behavior across different holiday types.Christian Doppler Forschungsgesellschaft, CDGChristian Doppler Research Association as part of the Josef Ressel Centre for Predictive Value Network Intelligence (PREVAIL) , Austria; Government of Upper Austria as part of the Excellence Network Logistics-Logistikum. RETAIL, Austri
Effect of the morphology of hard segment domains in bio-based polyurethanes on the filtration properties of nanostructured filters
Get PDFRenewable polymers have attracted significant attention in recent years as alternatives to fossil-based materials, driven by concerns about the depletion of such resources and the need for sustainable development. This study reports on the synthesis of polyurethanes from renewable biomass-derived diols, and their subsequent application in nanostructured air filters produced via electrospinning. Comparison is made of the properties of bio-based polyurethane samples that varied in the molecular weights of the inherent poly (1,3-propanediol) soft segments. Their physical-mechanical properties were analysed, along with the morphology and filtration performance of the nanostructures. It was found that the arrangement of the hard segments affected both phase temperature transitions (i.e. the glass transition and melting point) of the prepared polyurethanes. Positive effect hard segments domain arrangements and the best filtration properties were observed for a bio-polyether-based aromatic polyurethane prepared with molar ratio of diisocyanate:polyether polyol:chain extender of 4.7:1:3.7 and a molar mass of used renewable polyol 1000 g/mol, a nanostructure boasting the largest pore size of those tested. Filter with pressure drop of 49 Pa only possessed quality factor exceeding 0.045 Pa-1. The work confirms the fact that the effects of fiber diameter and pore size on the filtration properties of nanostructured air filters fabricated to eliminate ultra-fine particles cannot be judged separately.Funding text 1: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Vladimir Sedlarik reports financial support was provided by Ministry of Education Youth and Sports of the Czech Republic. Vladimir Sedlarik reports financial support was provided by Ministry of the Environment of the Czech Republic. Simona Uhercova reports financial support was provided by Tomas Bata University in Zlin. Vladimir Sedlarik reports financial support was provided by Tomas Bata University in Zlin. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.This work was supported from the European Just Transition Fund within the Operational Programme: Just Transition under the aegis of the Ministry of the Environment of the Czech Republic, project CirkArena number CZ.10.03.01/00/22_003/0000045 and Operational Programme Johannes Amos Comenius OP JAC \"Application potential development in the field of polymer materials in the context of circular economy compliance (POCEK)\", number CZ.02.01.01/00/23_021/0009004. Authors are further grateful for co-funding from the development process of Centre of Polymer Systems, Tomas Bata University in Zlin, program DKRVO (RP/CPS/2024-28/002) supported by the Ministry of Education Youth and Sports of the Czech Republic. Muhammad Yasir also expresses his gratitude for support from the \u201CCreativity, Intelligence & Talent for the Zlin Region\u201D (CIT - ZK) programme. Simona Uhercov\u00E1 would also like to thank the Internal Grant Agency at Tomas Bata University in Zlin for its co-funding (project no. IGA/CPS/2024/003).; Funding text 2: Authors are further grateful for co-funding from the development process of Centre of Polymer Systems, Tomas Bata University in Zlin , program DKRVO (RP/CPS/2024-28/002) supported by the Ministry of Education Youth and Sports of the Czech Republic. Muhammad Yasir also expresses his gratitude for support from the \u201CCreativity, Intelligence & Talent for the Zlin Region\u201D (CIT - ZK) programme. Simona Uhercov\u00E1 would also like to thank the Internal Grant Agency at Tomas Bata University in Zlin for its co-funding (project no. IGA/CPS/2024/003).; Funding text 3: This work was supported from the European Just Transition Fund within the Operational Programme: Just Transition under the aegis of the Ministry of the Environment of the Czech Republic , project CirkArena number CZ.10.03.01/00/22_003/0000045 and Operational Programme Johannes Amos Comenius OP JAC \"Application potential development in the field of polymer materials in the context of circular economy compliance (POCEK)\", number CZ.02.01.01/00/23_021/0009004.European Just Transition Fund within the Operational Programme: Just Transition under the aegis of the Ministry of the Environment of the Czech Republic [CZ.10.03.01/00/22_003/0000045]; Operational Programme Johannes Amos Comenius OP JAC [CZ.02.01.01/00/23_021/0009004]; Tomas Bata University in Zlin [RP/CPS/2024-28/002]; Ministry of Education Youth and Sports of the Czech Republic; Creativity, Intelligence & Talent for the Zlin Region" (CIT-ZK) programme; Internal Grant Agency at Tomas Bata Uni-versity in Zlin [IGA/CPS/2024/003
Knowledge inflows and outflows in collaborative spaces. The study of makerspaces in Central European countries
Get PDFIn recent years, a multitude of novel work environments have developed throughout Europe. Among these is the makerspace (MS), a new kind of collaborative space that fosters a do-it-yourself ethos. In its nature, MS has the potential to facilitate strong knowledge interactions. Therefore, the objective of this paper is to examine the significance of local knowledge inflows and outflows from and to MSs in the selected Central European countries, including the Czech Republic, Slovakia, and Poland. Instead of the conventional examination of intra-MS knowledge flows, the authors investigate external knowledge flows and typologies of their spatial scales within the context of an exploratory research approach. Furthermore, the paper examines the underlying causal conditions that facilitate local knowledge interactions. To this end, the authors conducted 22 in-depth interviews and carried out three case studies of various MSs. A fuzzy-set qualitative content analysis (fsQCA) was employed to ascertain the potential determinants of stronger local interactions. It has been determined that local knowledge ecosystems are developing within MSs operating in both metropolitan and non-metropolitan regions. Establishing global pipelines is not a prerequisite for MS success, particularly in non-metropolitan areas, where it may be superseded by national or local buzz.Polish National Science Centre [2019/35/O/HS4/00861]; INTER-EXCELLENCE, sub-programme INTER-COST [LTC20047
Addictions in potential sperm donors: What is possible to control?
No full textINTRODUCTION: Third-party sperm donation represents the sole viable option for conception for a considerable number of infertile couples. The donation process is predicated on ensuring the high quality and safety of the donated cells. While screening for transmissible and genetic diseases is in place, there is an absence of uniform screening for substance use in potential donors. AIM: The aim of this review is to provide summary information on national approaches to sperm donation and to highlight the lack of standardised screening protocols and a uniform approach to assessing dependency in potential sperm donors.
DESIGN: The review draws on a total of 44 sources, comprising legislation and up-to-date data from national and supranational organisations, and expert scientific studies.
RESULTS: The prevalence of substance use is highest among men of reproductive age, who fall into the group of potential sperm donors. The screening for substance use is currently limited to anamnestic interviews, in which basic questions are asked. In the Czech Republic and other European
What is uric acid concentration in urine in patients with uric acid kidney stones? - a case study
Get PDFThis case report describes a patient with uric acid kidney stones. Alkalization therapy using mainly potassium citrate is the first-choice treatment. When hyperuricosuria > 4 mmol/24 hours is present, xanthine oxidase inhibitors are added. It implies that accurate urine uric acid measurement is of high importance. Uric acid was measured in a 24-hour collection and a second-morning sample. Urine uric acid was measured after sample alkalization to pH > 6.5 and heating to 56 °C for 10 minutes, and for educational reasons without sample treatment. The uric acid excretion in the sample without alkalization in the 24-hour collection was 2.436 mmol, after alkalization, the excretion was 4.650 mmol/24 hours. Sample alkalization led to a prescription for xanthine oxidase inhibitor medication that is indicated as the second-line therapy when hyperuricosuria > 4 mmol/24 hours is present. This case study shows how the correct preanalytical phase is essential for medical decision-making. This record is sourced from MEDLINE/PubMed, a database of the U.S. National Library of Medicin
Decentralised construction of a global coordinate system in a large swarm of minimalistic robots
Get PDFCollective intelligence and autonomy of robot swarms can be improved by enabling individual robots to become aware that they are the constituent parts of a larger whole and to identify their role within the swarm. In this study, we present an algorithm to enable positional self-awareness in a swarm of minimalistic, error-prone, stationary robots which can only locally broadcast messages and estimate the distance from their neighbours. Despite being unable to measure the bearing of incoming messages, the robots running our algorithm can calculate their position within a swarm deployed in a regular formation. We show through experiments with up to 200 Kilobot robots that such positional self-awareness can be employed by the robots to create a shared coordinate system and dynamically self-assign location-dependent tasks. Our solution has fewer requirements than state-of-the-art algorithms and includes collective noise-filtering mechanisms. Therefore, it has an extended range of robotic platforms on which it can run. All robots are interchangeable, run the same code, and do not need any prior knowledge. Through our algorithm, robots reach collective synchronisation and autonomously become aware of the swarm’s spatial configuration and their position within it.Open Access funding enabled and organized by Projekt DEAL. This work was supported by OP VVV project International Mobility of Researchers of TBU in Zl\u00EDn project no. CZ.02.2.69/0.0/0.0/16_027/0008464 and further by program \u201CExcellence initiative\u2014research university\u201D for the AGH University in Krakow as well as the ARTIQ project: UMO-2021/01/2/ST6/00004 and ARTIQ/0004/2021. A. Reina acknowledges support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany\u2019s Excellence Strategy\u2014EXC 2117\u2013422037984. S. Garnier acknowledges support from the National Science Foundation under grant no. #EF-2222418.Ministerstvo Scaron;kolstv, Mldezcaron;e a Tecaron;lovchov
Innovative adaptive industrial gripper
No full textThis study presents the development and evaluation of an adaptive Universal Jamming Gripper (UJG) designed for industrial applications. The gripper employs a membrane filled with granular materials that transition between flexible and rigid states under vacuum pressure, enabling adaptive grasping of objects with diverse geometries. Various membrane fillings, including ground coffee, polystyrene microspheres (EPS), and thermoplastic elastomer granules (TPE), were tested to determine optimal grip stability. Experimental results demonstrated that the gripping force is significantly influenced by the object’s shape and the type of filling used, with EPS microspheres providing superior adaptability and stability. Performance tests on an industrial robotic arm confirmed the gripper’s effectiveness in handling objects of different sizes and shapes. The study highlights the advantages of adaptive grippers in enhancing automation flexibility, reducing downtime, and improving efficiency. Future research will focus on long-term durability, real-object testing, and integration with robotic systems to optimize industrial implementation.This research was funded by the Internal Grant Agency of Tomas Bata University supported under project No. IGA/CebiaTech/2024/002. Thanks to the developers of the AI tools, which were used only for language proofreading of some parts of the text
Implementation of game-based learning in subject of applied informatics in industrial automation curricula
No full textThis article deals with the implementation of the game-based learning concept in teaching students of the Applied Informatics in Industrial Automation curriculum in both full-time and part-time study at Faculty of Applied Informatics, Tomas Bata University in Zlin, Czechia, Europe, in the form of a educational computer game using object-oriented programming in MATLAB software. The article presents a basic description of the game-based learning concept with examples of the use of computer games in teaching in various sectors, and the subsequently the modification of the created game, the structure of this game from both the programmer's and the user's perspective, and an evaluation of its use in teaching at a university in the form of a questionnaire. The questionnaire consisted of a total of 6 questions, which were used to verify students’ satisfaction with the expansion of teaching using this computer game. The popularity of this computer game in teaching was ensured by the fact that it is based on a similar knowledge game that is broadcast every weekday on Czech Television