Fakulta elektrotechniky a komunikačních technologií

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    COMPARISON OF GRAND PIANOS ANT. PETROF AND MISTRAL
    (Journal Akustika, 2024-11-24) Jirásek, Ondřej; Peloušek, Tomáš
    This paper describes the measurement of two Petrof grand pianos: Ant. Petrof and Mistral. The goal was to compare their parameters, i.e. harmonic spectra, decay time, relative sound level, spectral centroids, and cumulative line spectra (CLS). The complete range of 88 tones (keys) was measured in the anechoic chamber of Petrof, where we used a play-bench for precision. The obtained data were analysed and put into comparison. This analysis was supplemented by a comparison of selected samples (keys A2 and A4 played in forte and piano dynamics) to samples of three competing brands (Shigeru Kawai, Yamaha, Steinway).
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    Smart City Concept, Applications and Services
    (Hilaris, 2014-11-11) Novotný, Radovan; Kuchta, Radek; Kadlec, Jaroslav
    The purpose of this article is to summarize the current state of understanding the smart city concept and to present a proposed communication platform for the development of city services.
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    Monometalic Textile Electrodes for "Green" Batteries
    (Kaunas University of Technology, 2014-11-08) Vojtěch, Lukáš; Hájek, Jiří; Neruda, Marek; Zatloukal, Miroslav
    This papes focused on design and manufacture of monometalic textile electrodes for "green " batteries, using ecological technologies.
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    Thermoresistant Newcastle disease vaccine effectivelyprotects SPF, native, and commercial chickens inchallenge with virulent virus
    (Wiley-VCH, 2023-03-07) Abdoshah, Mohammad; Hassanzadeh, Mohammad; Masoudi, Shahin; Ashtari, Abbas; Yousefi, Alireza; Partovi Nasr, Minoo
    Background: Due to the more stability and a better homogenecity in immune response, the use of thermoresistant vaccines in different chicken types has been increased. Objective: This study aimed to evaluate the efficacy of a newly developed Newcastle disease vaccine (ND.TR.IR ) originating from 1-2 strain in specific pathogen-free (SPF) and native and broiler chickens. Methods: Following determination of pathogenicity indices on the candidate seed, three efficacy examinations were conducted. In the first experiment, 120 1-day-old SPF chickens were randomly allocated to six groups and either vaccinated with ND.TR.IR via eye drop at 1, 7, and 21 days of age (V-1, V-7, and V-21), or considered as non-vaccinated control groups (C-1, C-7, and C-21). At 20th post-vaccination day, sera hemag-glutination inhibition (HI) antibody titres against ND virus (NDV) were measured and then the chickens were challenged by virulent NDV (vNDV). In the second and third experiments, the efficacy of ND.TR.IR vaccine was compared to routine vaccination program (B1 and LaSota) in native and broiler chickens that were vaccinated at 10 and 20 days of age, respectively. The HI antibody titres were measured on 10, 20, 30, and 40 days of age, and also challenge efficacy test with vNDV was conducted on 30 days of age. Results: The studied virus, as a vaccinal seed, complied with the pathogenicity indices of avirulent NDV and molecular identity of 1-2 strain. In the efficacy evaluation trials, the vaccinated chickens had higher HI antibody titres against NDV compared with their corresponding control chickens (p < 0.05). Results of the challenge tests indicated 95% and 100% protection against vNDV in native, SPF, and broiler-vaccinated chickens, respectively. Conclusions: The present findings indicated that administration of ND.TR.IR induced appropriate HI antibody titres against NDV in SPF, native, and broiler chickens associated with good protection in efficacy test.
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    UAV-BS Integration with Urban Infrastructure: An Energy Efficiency Perspective
    (IEEE, 2024-11-04) Kirubakaran, Balaji; Vikhrova, Olga; Andreev, Sergey; Hošek, Jiří
    The integration of uncrewed aerial vehicles (UAVs) with fifth-generation (5G) cellular networks has been a prominent research focus in recent years and continues to attract significant interest in the context of sixth-generation (6G) wireless networks. UAVs can serve as aerial wireless platforms to provide on-demand coverage, mobile edge computing, and enhanced sensing and communication services. However, UAV-assisted networks present new opportunities and challenges due to the inherent size, weight, and power constraints of UAVs, their controllable mobility, and the line-ofsight (LoS) characteristics of communication channels. This article discusses these opportunities and challenges from the viewpoint of mobile network operators (MNOs), and offers a novel perspective on efficiently utilizing modern city infrastructures for UAV deployment in typical urban scenarios. In these scenarios, UAV-mounted base stations (UAV-BSs) can significantly improve service continuity and network energy efficiency. We compare system performance in terms of user satisfaction and energy efficiency between conventional UAV deployment, which follows demand dynamics, and an alternative approach where UAVs land on urban infrastructure equipped with charging stations. To identify the preferred UAV locations, while considering the limited availability of such stations and environmental dynamics, we employ a data-driven genetic algorithm. This algorithm closely approximates the true optimal locations subject to a moderate computational budget.