Tomas Bata University in Zlín
Institutional repository of Tomas Bata University LibraryNot a member yet
10673 research outputs found
Sort by
Structure and dynamics of the hyaluronan oligosaccharides and their solvation shell in water: organic mixed solvents
Get PDFHyaluronan (HA) is a natural polysaccharide occurring ubiquitously in the connective tissues of vertebrates widely used in the cosmetic and pharmaceutic industries. In numerous applications HA oligosaccharides are being chemically modified using reactions incompatible with aqueous solutions, often carried out in water: organic mixed solvents. We carry out molecular-dynamics (MD) simulations of HA oligosaccharides in water:1,4-dioxane and water:tert-butanol mixtures of different compositions. HA molecule causes a separation of the solvent components in its surroundings, especially in tert-butanol containing solutions, constituting thus a sol-vation shell enriched by water. Furthermore, interactions with ions are stronger than in pure water and depend on the solvent composition. Consequently, the dynamics of the HA chain varies with the solvent composition and causes observable conformational changes of the HA oligosaccharide. Composition of mixed solvents thus en-ables us to modify the interaction of HA with other molecules as well as its reactivity.Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT: 90140; Univerzita Tomáše Bati ve Zlíně: IGA/FT/2016/011, IGA/FT/2017/009, IGA/FT/2018/010, IGA/FT/2021/010, IGA/FT/2022/009Ministry of Education, Youth and Sports of the Czech Republic [IGA/FT/2016/011]; Ministry of Education, Youth and Sports of the Czech Republic through the e-INFRA CZ [e-INFRA CZ LM2018140]; Tomas Bata University in Zlin [IGA/FT/2017/009, IGA/FT/2018/010, IGA/FT/2021/010, IGA/FT/2022/009]; [90140
Inclusive leadership and turnover intention: the role of follower–leader goal congruence and organizational commitment
Get PDFPurpose: Using a dual-lens of leader–member exchange (LMX) and social exchange theory (SET), this study aims to propose a conceptual model that explores the nexus between inclusive leadership and turnover intention as mediated by follower–leader goal congruence and organizational commitment. Design/methodology/approach: Data were collected via a survey questionnaire from a sample of 322 front line employees working in different banks in Pakistan. The structural equational modeling (SEM) technique was used for hypotheses testing. Findings: Findings of the study show that inclusive leadership has a positive influence on follower–leader goal congruence which in turn has a positive influence on organizational commitment. Further, organizational commitment has a negative influence on turnover intention. Additionally, the results lend support to the mediating effects of follower–leader goal congruence on the relationship between inclusive leadership and organizational commitment, and the mediating effect of organizational commitment on the relationship between follower–leader goal congruence and turnover intention.
Research limitations/implications: This research extends the literature on inclusive leadership, follower–leader goal congruence, organizational commitment and turnover intention. This study focuses on the follower–leader centric approach.
Practical implications: The findings of this study can guide policymakers and management of the banking industry to develop the inclusive leadership qualities of existing managers to reduce the turnover intention of their employees.
Originality/value: By incorporating LMX and SET, this study tests a model that demonstrates the mediating role of follower–leader goal congruence and organizational commitment in the relationship between inclusive leadership and employees’ turnover intention.Tomas Bata University in Zlin, TBU: IGA/FaME/2022/008Internal Grant Agency of Fame through Tomas Bata University in Zlin; [IGA/FaME/2022/008
Boosting the photoelectrochemical performance of Au/ZnO nanorods by co-occurring gradient doping and surface plasmon modification
Get PDFBand bending modification of metal/semiconductor hybrid nanostructures requires low-cost and effective designs in photoelectrochemical (PEC) water splitting. To this end, it is evinced that gradient doping of Au nanoparticles (NPs) inwards the ZnO nanorods (NRs) through thermal treatment facilitated faster transport of the photo-induced charge carriers. Systematic PEC measurements show that the resulting gradient Au-doped ZnO NRs yielded a photocurrent density of 0.009 mA/cm(2) at 1.1 V (vs. NHE), which is 2.5-fold and 8-fold improved compared to those of Au-sensitized ZnO and the as-prepared ZnO NRs, respectively. The IPCE and ABPE efficiency tests confirmed the boosted photoresponse of gradient Au-incorporated ZnO NRs, particularly in the visible spectrum due to the synergistic surface plasmonic effect of Au NPs. A gradient Au dopant profile promoted the separation and transfer of the photo-induced charge carriers at the electrolyte interface via more upward band bending according to the elaborated electrochemical impedance spectroscopy and Kelvin probe force microscopy analyses. Therefore, this research presents an economical and facile strategy for preparing gradient plasmonic noble NP-incorporated semiconductor NRs, which have excellent potential in energy conversion and storage technologies.LTT20010; RP/CPS/2022/007; Tomas Bata University in Zlin, TBUMinistry of Education, Youth and Sports of the Czech Republic DKRVO [RP/CPS/2022/007]; Ministry of Education, Youth and Sports of the Czech Republic INTER-EXCELLENCE [LTT20010]; Tomas Bata University in Zli
Mining Top-K high utility itemsets using bio-inspired algorithms with a diversity within population framework
No full textHigh-utility itemset mining (HUIM), as a necessary data mining task, has paid the attention of many researchers. It includes numerous applications in various arears. Recently, a method, which improved the memory usage and runtime for HUIs mining, was proposed, is called TKO-BPSO. It helps to automatically increase the border thresholds and might considerably reduce the combinational problem for pruning the search space effectively. However, the idea only works to maintain the current optimal values in the next populations, leading to the variety within populations is limited. To handle this problem, we propose a new bio-inspired algorithm-based HUIM framework to explore HUIs, namely TKO-HUIMF-PSO (Top-K high utility itemset mining in One phase based on a HUIM Framework of Particle Swarm Optimization). The main idea of TKO-HUIMF-PSO adapts the standard roadmap of bio-inspired algorithms by applying roulette wheel selection to all the discovered HUIs to determine the target values of the next population. Consequently, it improves the diversity within populations. Significant experiments conducted on publicly available several real and synthetic datasets delineate that the proposed algorithm is efficient and effective in terms of runtime and memory usage. © 2022 IEEE.IGA/CebiaTech/022/001; Technology Agency of the Czech Republic, TACR: FW0101038
Flexible, ultrathin and light films from one-dimensional nanostructures of polypyrrole and cellulose nanofibers for high performance electromagnetic interference shielding
Get PDFCombining highly conducting one-dimensional nanostructures of polypyrrole with cellulose nanofibers (CNF) into flexible films with tailored electrical conductivity and mechanical properties presents a promising route towards the development of eco-friendly electromagnetic interference shielding devices. Herein, conducting films with a thickness of 140 μm were synthesized from polypyrrole nanotubes (PPy-NT) and CNF using two approaches, i.e., a new one-pot synthesis consisting of in situ polymerization of pyrrole in the presence of structure guiding agent and CNF, and a two-step synthesis, in which CNF and PPy-NT were physically blended. Films based on one-pot synthesis (PPy-NT/CNFin) exhibited higher conductivity than those processed by physical blending, which was further enhanced up to 14.51 S cm-1 after redoping using HCl post-treatment. PPy-NT/CNFin containing the lowest PPy-NT loading (40 wt%), thus the lowest conductivity (5.1 S cm-1), displayed the highest shielding effectiveness of −23.6 dB (>90 % attenuation), thanks to the good balance between its mechanical properties and electrical conductivity.Grantová Agentura České Republiky, GA ČR: 21-09830SCzech Science Foundation [21-09830S, A2_FCHI_2022_007
Simulation for education: Improving personal responsiveness in case of violent attack
Get PDFThis article is focused on our proposal of simulation for education. Our deal was to create a tool that would help people improve their responsiveness in a violent attack. Our research analyses the terrorist attacks and other violent attacks, and we try to find the best possibilities of security measures. In the last years, Soft targets are a huge problem in the area of security and safety. The security measures are limited for protecting the Soft targets, which are the place or event with many people's accumulation and weak security measures against violent attacks. The critical factor is time - time to the reaction of the attacks. So, we want to prepare the people for a possible conflict situation. This article presents our educational platform that people can use for training, education, and improving their ability (quick decision-making, responsiveness, etc.). This article is divided into several parts. We present state of the art, Soft targets - definition, characteristics, statistics of the terrorist attacks. Then we introduce our educational platform, which is based on videos and photos. © 2021 The Authors.Ministerstvo Vnitra České Republik
Clusters and Innovation: The relationship between membership in clusters organisations and technological maturity of companies in Poland
Get PDFThis article aims to investigate the relationship between cluster organisation membership and the performance of companies in terms of their technological maturity. The article introduces and operationalises a new concept of technological maturity which reflects competitiveness, innovativeness, and market reputation of a company in a particular sector. To compare the technological maturity between cluster organisation members and non-members a composite index was created. The study is based on theoretical and empirical analyses. The empirical part is based on firm-level data collected in the survey from 464 companies identified in the technological fields covered by the National Smart Specializations in Poland. A set of statistical tests has been employed to assess whether (a) the indicators differ significantly between cluster organisation members and non-members (b) the composite index differs significantly between cluster organisation members and non-members. Results of the analysis show a positive relationship between being a member of the cluster organisation and the technological maturity of the company. The regression analysis proved that the relationship remains significant when controlling for the industry, geographical location, and size of a company. The article contributes to the discussion about the role of cluster organisations and their economic impact. © 2022 The Author(s). Published by Vilnius Gediminas Technical University.Ministrstvo za Gospodarski Razvoj in Tehnologij
EEG-based lie detection using ERP P300 in response to known and unknown faces: An overview
No full textConcealed information detection is nowadays an essential part of security. Conventional lie detectors are expensive, time-consuming, and their accuracy depends on the subject. Many researchers have focused on investigating concealed information for lie detection using electroencephalography (EEG) to recognize a lie better. This work aimed to provide an overview of scientific studies on EEG-based lie detection in the context of ERP P300 during the presentation of known and unknown faces published in the last five years (2017-2022). To the best of our knowledge, there is no recent available review of the most used methods for EEG data analysis in this field. For that reason, this article was created containing the current most used methods for feature extraction and classification, protocols, and accuracy of individual approaches. © 2022 IEEE.Tomas Bata University in Zlin, TBU: IGA/CebiaTech/2022/00
A practical approach to cleaning molds from rubber residues
Get PDFIn this paper, methods of fouling prevention and cleaning of the molds from vulcanized rubber residues are presented. The surface free energy of mold surfaces has been measured and the mold release agents were compared by measuring the force needed for the release of the form. The efficiency of sodium hydroxide solvent currently used for mold cleaning in industrial practice is compared with an acid-based solvent. The effect of the acid on the mold surface is monitored as well. The relative mass loss and the change in the surface roughness parameters Sa and Sz were evaluated during the corrosion testing in the acid at various temperatures. The mold wear during a year of use in the company, and a year of continuous acid exposure was then extrapolated for steel and stainless-steel molds. Nitric acid was significantly more effective than NaOH in dissolving rubber with full dissolution occurring after 3 h at 80°C when stirred, losing 33 % of its initial mass, while NaOH lost only 0.3 % after 24 h. Stainless steel proved very resistant to acid corrosion at 50°C with a calculated loss of 0.003 cm of thickness per year of submersion, while 1.7131 steel would lose 0.264 cm of thickness. © 2022 IEEE
Detection and face recognition of people by camera for security applications
No full textThis article discusses the possibility of applying software evaluation for detection and recognition in the inside and outside security areas. The methods of face detection and recognition, the methods used in practice are listed in the description. The program Wolfram Mathematica software was used for face detection with a subsequent comparison with the database of persons and outlines methods of testing according to the international standard. Finally, the testing of these software programs is described with a focus on their reliability according to predetermined scenarios. There are listed the final comparison between several evaluation programs which can process the face detection. © 2019, Danube Adria Association for Automation and Manufacturing, DAAAM. All rights reserved.IGA/CebiaTech/2019/003, IGA/FAI/2019/003; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT: LO1303, MSMT-7778/2014; European Regional Development Fund, ERDF: CEBIA-Tech ED2.1.00/03.008