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Ing. Marek Neruda, Ph.D.

Všechny publikace

Resource Efficient Real-time Reliability Model for Multi-Agent IoT Systems

  • DOI: 10.1109/ACCESS.2021.3138931
  • Odkaz: https://doi.org/10.1109/ACCESS.2021.3138931
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Rising demand for the integration of IoT services in cloud computing has brought cloud- native principles (e.g., system automation, loosely coupled services, etc.) to the edge of the network. A fundamental element of the cloud-native approach is a microservice — an instance, which is usually virtualised, serving for only a defined purpose. Virtualised microservices are mostly used in cloud-based IoT systems, which can be covered with multi-agent system (MAS) paradigm. The maintenance of a MAS requires a constant monitoring to track the system state and to satisfy the service level agreement (SLA) (or any other) requirements. This paper presents a resource efficient reliability model for MAS IoT systems for monitoring purposes. First, we provide a thorough mathematical analysis to describe the generic system model and its elements. This model takes into account SLA requirements and it is characterised with linear time complexity, simplicity of computations and input metrics (e.g., combination of SLA for CPU and its workload), where all of the input data are aligned to the same range. Then, we evaluate time complexity and provide a measurement to demonstrate the reliability of the model application. The results show that the proposed model is efficient for large number of the IoT agents. It is approximately 98 times faster in AQ:4 computation with 1,000 systems and 51 times faster in computations with 1,000 systems.

Simulation of Radio Signal Propagation for UHF RFID Technology in an Indoor Environment Using Ray Tracing (Graphics) Method

  • DOI: 10.3390/app122111065
  • Odkaz: https://doi.org/10.3390/app122111065
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    RFID systems are often used in industry to reduce costs, increase process efficiency and minimize human intervention. The challenge is to design an RFID system before it is implemented in a specific environment in the shortest possible time and at minimum cost while maintaining the accuracy of the results. In this paper, a new approach to predicting indoor UHF RFID signal coverage is presented. It is based on a graphical ray tracing method. Simulations are performed based on spatial analysis of the illumination of a 3D indoor environment created from a 2D floor plan. The results show a heat map representing the predicted RSSI radio signal levels using a color range. The approach is validated by comparison with the results of the empirical Multi-Wall model. The time complexity of the approach is presented. The proposed approach is able to generate a heat map with the accuracy of the empirical Multi-Wall model. The interior room equipment required to refine the results ought to be investigated in the future.

LoRa jako doplněk stávající infrastruktury přístupového systému (LoRa as a complement to the existing access system infrastructure)

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Bezdrátové senzorové sítì (WSN - The Wireless Sensor Network) hrají důležitou roli v konceptu internetu věcí (IoT). Inteligentním budovám poskytují pohodlný způsob shromažďování dat ze senzorů a ovládání elektronických zařízení v budovách a i v jejich okolí. Tento článek popisuje návrh a ověření proveditelnosti řešení, ve kterém je stávající infrastruktura přístupového systému, založená a průmyslové sběrnici RS485, rozšířena o bezdrátovou senzorovou síť LoRa s uzly se senzory pro měření teploty a vlhkosti a komunikační bránu LoRa. Provozní měření na jednom patře bloku ČVUT v Praze ukazuje, že v závislosti na použité datové rychlosti sběrnice RS485 a použité rezervě datové rychlosti, která předchází selhání funkce řízení přístupového systému, je možno provozovat desítky až stovky senzorových uzlů současně vysílajících svá data. Výsledky dokazují, že WSN lze efektivně použít ve stávající infrastruktuře RS485.

Methodology of Studying Effects of Mobile Phone Radiation on Organisms: Technical Aspects

  • DOI: 10.3390/ijerph182312642
  • Odkaz: https://doi.org/10.3390/ijerph182312642
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The negative influence of non-ionizing electromagnetic radiation on organisms, including humans, has been discussed widely in recent years. This paper deals with the methodology of examining possible harmful effects of mobile phone radiation, focusing on in vivo and in vitro laboratory methods of investigation and evaluation and their main problems and difficulties. Basic experimental parameters are summarized and discussed, and recent large studies are also mentioned. For the laboratory experiments, accurate setting and description of dosimetry are essential; therefore, we give recommendations for the technical parameters of the experiments, especially for a well-defined source of radiation by Software Defined Radio.

Auto-ID Technology and the Internet of Things to Enhance the Quality of Health Services U-Health Concept

  • Autoři: Unucka, J., Staša, P., Beneš, F., Švub, J., doc. Ing. Lukáš Vojtěch, Ph.D., Ing. Marek Neruda, Ph.D., Urban, P.
  • Publikace: 2020 IEEE 2nd Eurasia Conference on Biomedical Engineering, Healthcare and Sustainability (ECBIOS). Piscataway: IEEE, 2020. p. 137-140. ISBN 978-1-7281-8712-9.
  • Rok: 2020
  • DOI: 10.1109/ECBIOS50299.2020.9203630
  • Odkaz: https://doi.org/10.1109/ECBIOS50299.2020.9203630
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Health care facilities are subject to high demands on the optimization of the management of medicines and medicaments, resulting inter alia from the requirements of the Joint Accreditation Commission. These demands depend primarily on the quality of the personnel and the ability to prevent errors due to human factors. By meeting these requirements and adhering to them, healthcare facilities will achieve accreditation of the quality of care provided. The whole concept is based on utilization of Auto-ID and Internet of Things technology which brings new opportunities for healthcare sector. To ensure a high standard of care with U-Health concept, we developed e.g. new type of bed that respect the concept of Auto-ID and IoT. This type of bed is equipped with a newly developed intelligent mattress with integrated sensor of surface loading, which enables timely preventive warning when the change of the position is needed.

Evaluation of Electrical Properties of Metalized Woven and Non-woven Polymer-Based Textiles

  • DOI: 10.1109/ISSE49702.2020.9120943
  • Odkaz: https://doi.org/10.1109/ISSE49702.2020.9120943
  • Pracoviště: Katedra elektrotechnologie, Katedra telekomunikační techniky
  • Anotace:
    The smart textiles seem to be a very interesting possibility in many industrial fields e.g. medicine, automotive, textile industry etc. These types of textile are mainly based on metalized threads. It is necessary to know the physical characteristics of smart textiles before their use for a specific application. This article deals with the preparation and characterization of three types of textiles - copper-coated non-woven polyamide fabric and copper and nickel coated woven polyester fabric. Characterization was based on the measurement of textiles properties like the thickness of metallization, electrical resistance. The measurements of thickness metallization were done at micro-section by electron microscopy. The electrical resistance was evaluated for further usage of these fabrics as a heating system in smart textiles, where a low resistance of the heating part is desirable. The sheet resistance was measured in different directions to obtain information about the isotropic or anisotropic character of samples. The highest electrical resistance had woven copper-coated polyamide fabrics. The anisotropic character of samples was more obvious for woven polyester fabrics.

Fuzzy Logic Based Indoor Localization Using WLAN Infrastructure

  • DOI: 10.1109/ECBIOS50299.2020.9203711
  • Odkaz: https://doi.org/10.1109/ECBIOS50299.2020.9203711
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The paper introduces a method and system for real-time positioning of mobile terminals in indoor areas. The system uses wireless LAN infrastructure (usually Wi-Fi) and evaluates signal strength from different access points. The system meets requirements and has been implemented in Java for Android-based mobile devices and successfully tested at the Centre for Assistive Technologies (CAT) at the Czech Technical University in Prague, Faculty of Electrical Engineering. The results demonstrate an average accuracy of approximately 2.5 m, which is satisfactory for determining the position of a client device at room-level (e.g. in hospitals for checking whether a patient or staff member is currently in an expected place or for deciding where they can be assigned). Its potential applications are in healthcare, disaster management, supervision of people with disabilities, etc., but also in monitoring staff and goods in closed areas.

Indoor Positioning System based on Fuzzy Logic and WLAN Infrastructure

  • DOI: 10.3390/s20164490
  • Odkaz: https://doi.org/10.3390/s20164490
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper deals with the issue of mobile device localization in the environment of buildings, which is suitable for use in healthcare or crisis management. The developed localization system is based on wireless Local Area Network (LAN) infrastructure (commonly referred to as Wi-Fi), evaluating signal strength from different access points, using the fingerprinting method for localization. The most serious problems consist in multipath signal propagation and the different sensitivities (calibration) of Wi-Fi adapters installed in different mobile devices. To solve these issues, an algorithm based on fuzzy logic is proposed to optimize the localization performance. The localization system consists of five elements, which are mobile applications for Android OS, a fuzzy derivation model, and a web surveillance environment for displaying the localization results. All of these elements use a database and shared storage on a virtualized server running Ubuntu. The developed system is implemented in Java for Android-based mobile devices and successfully tested. The average accuracy is satisfactory for determining the position of a client device on the level of rooms.

Experimental load test statistics for the selected IPS tools on low-performance IoT devices

  • DOI: 10.2478/jee-2019-0058
  • Odkaz: https://doi.org/10.2478/jee-2019-0058
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The goal of this paper is to propose a testing procedure for selected Intrusion Prevention Systems (IPS) in a realistic network traffic in terms of their suitability on a given hardware microcomputers for low-performance devices for Internet ofThings (IoT). We perform an IPS research in terms of resource usage in order to establish a universal procedure of checking,whether a given microcomputer controlling IoT devices (often in overloaded state) can additionally burden the installation and start-up of IPS. The experiment is repeated on several boards under overload condition to determine the maximum data rate, above which transmission degrades. The presented testing method is an exemplary tool for IoT applications concerning the security of embedded devices with low performance.

Real-Time Localization of Transmission Sources by a Formation of Helicopters Equipped with a Rotating Directional Antenna

  • DOI: 10.1007/978-3-030-14984-0_25
  • Odkaz: https://doi.org/10.1007/978-3-030-14984-0_25
  • Pracoviště: Katedra telekomunikační techniky, Multirobotické systémy
  • Anotace:
    This paper proposes a novel technique for radio frequency transmission sources (RFTS) localization in outdoor environments using a formation of autonomous Micro Aerial Vehicles (MAVs) equipped with a rotating directional antenna. The technique uses a fusion of received signal strength indication (RSSI) and angle of arrival (AoA) data gained from dependencies of RSSI on angle measured by each direc- tional antenna. An Unscented Kalman Filter (UKF) based approach is used for sensor data fusion and for estimation of RFTS positions during each localization step. The proposed method has been verified in simula- tions using noisy and inaccurate measurements and in several successful real-world outdoor deployments.

Autonomous System for UHF RFID Signal Measurement in Industrial Environment

  • Autoři: Švub, J., Staša, P., Beneš, F., doc. Ing. Lukáš Vojtěch, Ph.D., Ing. Marek Neruda, Ph.D., Brožek, T.
  • Publikace: The Proceedings of the 2018 11th IFIP Wireless and Mobile Networking Conference (WMNC). Laxenburg: International Federation for Information Processing, 2018. p. 81-86. ISSN 2163-4033. ISBN 978-3-903176-03-4.
  • Rok: 2018
  • DOI: 10.23919/WMNC.2018.8480906
  • Odkaz: https://doi.org/10.23919/WMNC.2018.8480906
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Deployment of UHF RFID technology in the industrial environment is not easy to perform because of the heterogeneity of the environment, the propagation of the high frequency radio signal, the interference, and the associated timeconsuming implementation. The paper deals with deployment and evaluation of developed autonomous system for measurement of UHF RFID signals in industrial environment. Such a system allows, in defined 3D real-world locations, to obtain autonomously information about the actual Received Signal Strength Indicator of the moving RFID tag (Etalon) that is registered while investigated with each antenna of RFID reader. A corridor was chosen as an experimental area, and Received Signal Strength Indicator was evaluated by both, simulation and measurement methods. The results show a statistically significant relationship between measured and modeled Received Signal Strength Indicator in dBm at the 99% confidence level. The presented autonomous system can contribute to a more comprehensive analysis of measuring the electromagnetic field emitted by the UHF RFID antennas in various industrial environments.

Electrode Shapes and Frequency Band Analysis for Human Body Communication

  • Autoři: Hnyk, P., Kvarda, L., doc. Ing. Lukáš Vojtěch, Ph.D., Ing. Marek Neruda, Ph.D., Zitta, T.
  • Publikace: Proceedings of the 2018 18th International Conference on Mechatronics - Mechatronika (ME) 2018. Brno: Brno University of Technology, Faculty of Mechanical Engineering, 2018. p. 360-365. ISBN 978-80-214-5544-3.
  • Rok: 2018
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Geometric shapes of electrodes for channel optimization of Human Body Communication (HBC) are presented. Effective energy coupling between signal electrodes and the human body is described in deep. The influence of transmitting distance of HBC channel, ground leakage, human body composition, surrounding environment, geometric shapes and contact of the electrodes with the body on capacitive coupling is discussed. Selected geometric shapes of electrodes are developed, measured and compared for its effectiveness. The key finding of the research is that the best shape for capacitive coupling (CC-HBC) electrode is the octagon, and dynamic carrier frequency change.

Electromagnetic Shielding Effectiveness of Woven Fabrics with High Electrical Conductivity: Complete Derivation and Verification of Analytical Model

  • DOI: 10.3390/ma11091657
  • Odkaz: https://doi.org/10.3390/ma11091657
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    In this paper, electromagnetic shielding effectiveness of woven fabrics with high electrical conductivity is investigated. Electromagnetic interference-shielding woven-textile composite materials were developed from a highly electrically conductive blend of polyester and the coated yarns of Au on a polyamide base. A complete analytical model of the electromagnetic shielding effectiveness of the materials with apertures is derived in detail, including foil, material with one aperture, and material with multiple apertures (fabrics). The derived analytical model is compared for fabrics with measurement of real samples. The key finding of the research is that the presented analytical model expands the shielding theory and is valid for woven fabrics manufactured from mixed and coated yarns with a value of electrical conductivity equal to and/or higher than σ = 244 S/m and an excellent electromagnetic shielding effectiveness value of 25–50 dB at 0.03–1.5 GHz, which makes it a promising candidate for application in electromagnetic interference (EMI) shielding.

Multi-Channel Access to Improve QWL in Health Care Services - Infrastructure Based QoS Ensurance in IoT

  • DOI: 10.23919/ELMAR.2018.8534645
  • Odkaz: https://doi.org/10.23919/ELMAR.2018.8534645
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    We propose a multi-channel access to improve Quality of Work Life in health care services and Quality of Service in the Internet of Things with suitably chosen infrastructure. The demo of the proposed solution of multi-channel communication system is realized for the hospital cleaning staff. The Quality of Work Life is improved by exactly described procedures of work plan and the Quality of Service is improved by redundant transmission channels and technologies, following the scenario and service strategy.

Penetration Testing of Intrusion Detection and Prevention System in Low-Performance Embedded IoT Device

  • Autoři: Zitta, T., Ing. Marek Neruda, Ph.D., doc. Ing. Lukáš Vojtěch, Ph.D., Matějková, M., Jehlička, M., Hach, L., Moravec, J.
  • Publikace: Proceedings of the 2018 18th International Conference on Mechatronics - Mechatronika (ME) 2018. Brno: Brno University of Technology, Faculty of Mechanical Engineering, 2018. p. 387-391. ISBN 978-80-214-5544-3.
  • Rok: 2018
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The penetration testing method of provided security protection by IDS/IPS (Intrusion Detection System / Intrusion Prevention System) tool Suricata in the lowperformance embedded IoT device is presented. Penetration testing tools are presented with emphasis on software tools, such as NMAP and Metasploit. The used testing method is described in deep. IDS/IPS tool Suricata is implemented in embedded platform Raspberry Pi 3. Main contribution is the implemented testing method for Suricata IPS that can be used in other applications of security rules of embedded IoT devices.

Surface Area Evaluation of Electrically Conductive Polymer-Based Textiles

  • DOI: 10.3390/ma11101931
  • Odkaz: https://doi.org/10.3390/ma11101931
  • Pracoviště: Katedra elektrotechnologie, Katedra telekomunikační techniky
  • Anotace:
    In this paper, the surface area of coated polymer-based textiles, i.e., copper and nickel plated woven polyester fabric, copper and acrylic coated woven polyester fabric, and copper and acrylic coated non-woven polyamide fabric, is investigated. In order to evaluate the surface area of the woven fabrics, Peirce’s geometrical model of the interlacing point and measurement using an electron microscope are used. Non-woven fabrics are evaluated using an optical method, handmade method, and MATLAB functions. An electrochemical method, based on the measurement of the resistance between two electrodes, is used for relative comparison of the effective surface area of the coated woven and non-woven fabrics. The experimental results show that the measured and calculated warp lengths do not differ within the standard deviation. The model for the surface area evaluation of the Pierce’s geometrical model for monofilament (non-fibrous) yarns is extended to multifilament yarns and to a uniform sample size. The experimental results show the increasing trend of surface area evaluation using both modeling and electrochemical methods, i.e., the surface area of the copper and acrylic coated woven Polyester fabric (PES) is the smallest surface area of investigated samples, followed by the surface area of the copper and acrylic coated non-woven fabric, and by copper and nickel plated woven PES fabric. These methods can be used for surface area evaluation of coated polymer-based textiles in the development of supercapacitors, electrochemical cells, or electrochemical catalysts.

Software Implementation of Secure Firmware Update in IoT Concept

  • DOI: 10.15598/aeee.v15i4.2467
  • Odkaz: https://doi.org/10.15598/aeee.v15i4.2467
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper focuses on a survey of secure firmware update in the Internet of Things, design and description of safe and secure bootloader implementation on RFID UHF reader, encryption with AES-CCM and versioning with use of external backup flash memory device. In the case of problems with HW compatibility or other unexpected errors with new FW version, it is possible to downgrade to previous FW image, including the factory image. Authentication is provided by the UHF RFID service tag used to extract unique initialization vector of the encryption algorithm for each update session. The results show slower update speed with this new upgrade method of approximately 27% compared to older one, using the only AES-CBC algorithm.

The security of RFID readers with IDS/IPS solution using Raspberry Pi

  • DOI: 10.1109/CarpathianCC.2017.7970418
  • Odkaz: https://doi.org/10.1109/CarpathianCC.2017.7970418
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper presents developed detection rules for LLRP (Low Level Reader Protocol) interface, implementation of IDS (Intrusion Detection System) and IPS (Intrusion Prevention System) solution for UHF (Ultra High Frequency) RFID (Radio Frequency Identification) reader using Raspberry Pi 3. Developed security solution is used for securing current RFID readers supporting LLRP. The paper also deals with a comparison of IPS/IDS solutions and subsequently selection of the appropriate one for the implementation using Raspberry Pi. Main contribution is the securing of RFID readers which are usually available without any encryption support on the market. The functionality is tested with software metasploit framework.

DoA Outdoor RFID Locator - System Verification Report

  • Pracoviště: Katedra teorie obvodů, Katedra telekomunikační techniky
  • Anotace:
    The paper discusses testing the RFID locator system in real traffic in a 1 km2 area of interest for localization. Digital processing of the signal, arriving to a 20-element antenna array at the individual receiving stations, is based on the direction on arrival (DoA) method. The achieved accuracy is typically within 1 m, thus the system met its creators' expectations. The paper describes the basic operating principle of the proposed system and compares the existing outdoor localization methods. There is also a description and the results of the experimental verification of the technology at two locations, including a determination of the localization error. The key idea is to use this technology in area of security application (especially critical infrastructures) and disaster management application.

Indoor Signal Propagation of LoRa Technology

  • Autoři: Gregora, L., doc. Ing. Lukáš Vojtěch, Ph.D., Ing. Marek Neruda, Ph.D.,
  • Publikace: Proceedings of the 2016 17th International Conference on Mechatronics - Mechatronika (ME) 2016. Prague: Czech Technical University in Prague, Faculty of Electrical Engineering, 2016. p. 476-479. ISBN 978-80-01-05883-1.
  • Rok: 2016
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    With an increasing number of small devices, the concept of LPWANs becomes more popular. The most important requirements on LPWANs include long battery lifetime, low price of devices, ability to connect millions of devices and long range coverage; the long range coverage is the most critical issue of this technology. In this paper we discuss indoor signal propagation of LoRa technology. At the beginning of the paper, there is an introduction to LoRa technology. Later, the paper presents a measurement of an indoor propagation of LoRa signal in a reinforced concrete building in Prague, the Czech Republic. The measurement is realized with one mobile transmitter and one receiver with a fixed location for each experiment. The measurement is performed for two experiments, one with the receiver in the basement of the building, one with the receiver on the roof of the building. Results of the measurement are graphically visualized for both measurement experiments at the end of this paper and show that the best signal coverage is for the roof location, where it includes also flats of neighboring entrances.

Mobile Application for Controlling UHF RFID Reader

  • Autoři: Zitta, T., Ing. Marek Neruda, Ph.D., doc. Ing. Lukáš Vojtěch, Ph.D.,
  • Publikace: Proceedings of the 2016 17th International Conference on Mechatronics - Mechatronika (ME) 2016. Prague: Czech Technical University in Prague, Faculty of Electrical Engineering, 2016. pp. 471-475. ISBN 978-80-01-05883-1.
  • Rok: 2016
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper presents design and implementation of mobile application for management of UHF (Ultra High Frequency) RFID (Radio Frequency Identification) reader. Developed mobile application is used for simplify and accelerate configuration of RFID readers. The paper also deals with analysis of UHF RFID reader parameters and subsequently determination the requirements on UHF RFID readers, data networks, mobile devices and development of mobile application. Application is developed for OS Android. JAVA Library LTK (LLRPToolkit) is used for implementing LLRP (Low Level Reader Protocol) for reader management. Main benefit of this application is utilizing LLRP on Android platform which was never been done before as application utilizing LLRP is not available on Google Play Store. The functionality is checked and tested with software RiFiDi and UHF RFID readers.

RFID Lokalizátor

  • Pracoviště: Katedra elektromagnetického pole, Katedra teorie obvodů, Katedra telekomunikační techniky
  • Anotace:
    Systém RFID lokalizátor umožňuje identifikovat oběti katastrof či zraněné osoby v definované oblasti. Systém zpracovává přenášené signály a do podrobné mapy zobrazuje v reálném čase polohu tagů, kterými jsou označeny oběti katastrofy či ranění. Řešení umožní optimalizovat postup záchranných prací a zároveň minimalizovat čas potřebný k záchraně, a to i v situaci, kdy jsou standardní komunikační systémy v důsledku katastrofy mimo provoz.

Software Implementation of a Secure Firmware Update Solution in an IOT Context

  • DOI: 10.15598/aeee.v14i4.1858
  • Odkaz: https://doi.org/10.15598/aeee.v14i4.1858
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The paper presents the secure delivery of firmware updates to Internet of Things (IoT) devices. Additionally, it deals with the design of a safe and se- cure bootloader for an Ultra High Frequency Radiofrequency Identification (UHF RFID) reader. A software implementation of a secure firmware update solution is performed. The results show the implementation of the Advanced Encryption Standard (AES) encryption into existing IoT devices, e.g. UHF RFID reader, requires at least 49.7 kB of flash memory and 10 kB of RAM, and therefore there is space to integrate even more security features into existing devices without hardware upgrade.

The Issue of LPWAN Technology Coexistence in IoT Environment

  • Autoři: Krupka, L., doc. Ing. Lukáš Vojtěch, Ph.D., Ing. Marek Neruda, Ph.D.,
  • Publikace: Proceedings of the 2016 17th International Conference on Mechatronics - Mechatronika (ME) 2016. Prague: Czech Technical University in Prague, Faculty of Electrical Engineering, 2016. p. 480-487. ISBN 978-80-01-05883-1.
  • Rok: 2016
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper discusses Low Power Wide Area Network technologies. The purpose of this work is a presentation of these technologies in a mutual context in order to analyse their coexistence. In this work there are described Low Power Wide Area Network terms and their representatives LoRa, Sigfox and IQRF, of which characteristics, topology and some significant technics are inspected. The technologies are also compared together in a frequency spectrum in order to detect risk bands causing collisions. A potential increased risk of collisions is found around 868.2 MHz. The main contribution of this paper is a summary of characteristics, which have an influence on the resulting coexistence.

Application of Shielding Textile Materials in Electric Vehicles

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    New designed power systems of electric and hybrid vehicles influence other systems by generated disturbing electromagnetic field. One of the promising measures to mitigate this negative effect can be found in additional shielding of cables, which can be provided by electrically conductive textile materials. This paper focuses on verification of utilization of specifically designed shielding textile material, which are used as additional cable shielding in order to prevent undesirable effects of electromagnetic disturbance on data transmission. The results of our measurements verify that this concept provides advantageous characteristics of electrically conductive textile materials such as shielding capability, elasticity and easy handling.

Design of RFID Outdoor Localization System RFID Locator for Disaster Management

Design of Solar Harvested Semi Active RFID Transponder with Supercapacitor Storage

  • DOI: 10.15598/aeee.v13i4.1485
  • Odkaz: https://doi.org/10.15598/aeee.v13i4.1485
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper presents the analysis, design and manufacture of a low cost, low maintenance and long-range prototype of RFID transponder with continuous operability. A prototype of semi-active RFID transponder is produced with a range that can be extended via a DC input to allow all of the readers signal power to be reflected via backscatter modulation. The transponder is powered via solar harvested power which is selected over other energy harvesting technologies as it provides a greater energy density and lower cost. Solar has one major drawback in terms of providing a steady DC voltage in it needed a constant supply of sunlight. A method of power storage is proposed, and the use of a supercapacitor over a rechargeable battery is used as it has a longer lifespan due to higher recharge rates. The prototype underwent a series of experiments in various working environments and proves an effective solution in providing long lasting operability. The paper concludes the use of solar harvesting with supercapacitor storage has potential for further uses in external remote sensors used in the Internet of Things.

GNSS/RFID Active Transponder Design

  • DOI: 10.15598/aeee.v13i5.1384
  • Odkaz: https://doi.org/10.15598/aeee.v13i5.1384
  • Pracoviště: Katedra elektromagnetického pole, Katedra teorie obvodů, Katedra telekomunikační techniky
  • Anotace:
    The paper describes a design of global navigation satellite system (GNSS)/Radio frequency identification (RFID) active transponder which is primarily designed for localization of objects as a part of localization system designated for efficient handling of situations with mass casualties. The precise localization is improved by differential GNSS. The block diagram of such GNSS/RFID active transponder is described including main operation procedures of the firmware. Measurement of the localization by algorithms of RTKLIB library and by algorithms of GNSS module is compared. Dynamic tests, i.e. GNSS/RFID active transponder placed in the moving car (50~kmph), and static tests, i.e. GNSS/RFID active transponder placed in the position for 15~min, are performed.

Outdoor Localization Technique Using Active RFID Technology Aimed for Security and Disaster Management Applications

RFID Platform as a Service, Containerized Ecosystem, Feasibility and Security Impact Analysis

  • DOI: 10.15598/aeee.v13i5.1499
  • Odkaz: https://doi.org/10.15598/aeee.v13i5.1499
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper presents a new concept as a special type of virtualization of particular event based communication components in RFID ecosystems. The new approach is containers based virtualization, and it is applied and tested on the container of Object name service. The results of the experiment allowed us to do the preliminary analysis of security consequences on the isolated containerized DNS-based RFID sub-service. We confirmed feasibility with this sandboxing technology represented by the special container. They bring the benefits in terms of efficient software component life-cycle management and integrity improvements. Experiments results of the containerization are discussed to show the possible isolation ways of other components like EPCis and middleware. There is present evaluation towards external threats and vulnerabilities. The result is a higher level of integrity, availability of whole ecosystem and resiliency against external threats. This gives a new opportunity to build robust RFID as Platform as a service, and it proves the ability to achieve a positive impact on the end to end service Quality of service.

UHF RFID Tag Design for Disaster Management

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper deals with the Ultra High Frequency (UHF) Radio Frequency Identification (RFID) tag design as a part of RFID localization system primarily designated for mass disasters. The design of RFID tag considers many casualties in an area of hundreds square meters, human body impedance, battery lifetime, maximal output power, resistant encapsulation etc. All requirements are taken into account in the design of several versions of RFID tag and the best one is chosen. Subsequently the design is manufactured and measured. Results show the designed RFID tag prototype is suitable for application in a disaster management.

FE Model of EM Shielding Textile Materials

  • DOI: 10.1109/MECHATRONIKA.2014.7018310
  • Odkaz: https://doi.org/10.1109/MECHATRONIKA.2014.7018310
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Technical textile materials can be successfully used also as a protection against external electromagnetic field. There are available technologies to improve the material surface – with use of different (galvanize, plate, etc.) technologies. The paper deals with woven textiles – compound of cotton, polyester and conductive fibers. The paper presents the impact of electromagnetic field on special woven textile materials and describes the shielding principles. The measurement technique used at FEL CTU in Prague is also described and the base measuring technologies are discussed. Nevertheless, the major part of the paper is dedicated to experience of authors with numerical (FE) modeling of shielding textiles and to description of designed and used methodology of FE model evaluation. The numerical results are compared to measurement and to mathematical (Matlab) model results.

Heating Ability of Electrically Conductive Textile Materials

  • DOI: 10.1109/MECHATRONIKA.2014.7018332
  • Odkaz: https://doi.org/10.1109/MECHATRONIKA.2014.7018332
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Electrically conductive textile materials can be successfully used also as textile conductors. Electrical heating system consists of power supply, supply conductors and the appliance which is formed by electrically conductive textile material with the ability of heat production. The paper presents modelling principles of these materials. Preparation of samples is discussed. Measurement techniques are described and the results show specific conditions for advantageous use of these materials especially in the area of medical applications.

Modelling of Conductive Textile Materials for Shielding Purposes and RFID Textile Antennas

  • DOI: 10.5755/j01.eee.20.8.8443
  • Odkaz: https://doi.org/10.5755/j01.eee.20.8.8443
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Present production of electronic devices requires gently handling with raw materials, whereas production costs and demands on environmental friendliness increase. This lack largely solves modern conductive textile materials that can be used as a barrier against electromagnetic and electrostatic fields as well as functional electrically conductive structures for use in the manufacture of textile antennas. The basic parameter of these materials is electrical conductivity, which is determined by resistance measurement of the fabric. Production therefore precedes measurement. This paper focuses on optimization of consumption of raw materials by the method of modelling of conductive textile structures so that electrical conductivity can be calculated preferentially to the fabric production. Model focuses on the calculation of resistance of the fabric to derive the electrical conductivity according to the methods specified in the standard EN 1149-1.

Monometallic Textile Electrodes for “Green” Batteries

  • DOI: 10.5755/j01.eee.20.8.8434
  • Odkaz: https://doi.org/10.5755/j01.eee.20.8.8434
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Global trends in the development of modern electrical devices include also eco-friendly demands. One of the areas is seen in environmentally friendly batteries (electrochemical power sources) which do not contain poisonous and heavy metals. Modern structures based on coated textile materials are an alternative to the current all-metal electrodes. The use of environmentally friendly metals often entails the necessity to apply multiple layers of metals, which negatively affects the lifetime of the electrodes and battery cells. Accordingly, this paper focuses on the design and manufacture of monometallic textile electrodes for "green" batteries, i.e. the use of ecological technologies for eco-friendly electronics, especially the new-generation electrochemical power sources. The proposed technological processes were verified by realization of specimens and measurement in laboratory conditions with good results. Industrially applicable technologies were used for applying a thick monometallic deposit to create the specimens. This will allow future mass production and deployment in electrical engineering applications.

Comparison Among Models to Estimate the Shielding Effectiveness Applied to Conductive Textiles

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The purpose of this paper is to present a comparison among two models and its measurement to calculate the shielding effectiveness of electromagnetic barriers, applying it to conductive textiles. Each one, models a conductive textile as either a (1) wire mesh screen or (2) compact material. Therefore, the objective is to perform an analysis of the models in order to determine which one is a better approximation for electromagnetic shielding fabrics. In order to provide results for the comparison, the shielding effectiveness of the sample has been measured by means of the standard ASTM D4935-99.

Control Procedure of Emergency Calls for Femtocells

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Fourth generation (4G) of cellular wireless standards includes small base stations, located at individual buildings as homes or other separated areas, called femtocells. They provide higher transfer rate and level of received signal. These small and low-power cellular base stations can provide a wide-range of military applications – while they can easily be set for closed and from environment isolated areas (or buildings) such as headquarters, ships, airplanes, trains etc. [1]. This technology allows to extend service coverage indoors or at the edges where direct access would be unavailable or limited. The safe and secure internal communication and data exchange channels are offered with possibility of external (internet) connection. Several standards bodies, such as 3GPP, WiMAX Forum, and IEEE 802.16, have started to develop standard solutions to enable and optimize femtocells operation [2]. Despite of possible advantages of WiMAX solution [3] the whole technology is solved by 3GPP group, including emergency call cases. However, they are not described and published in deep detail for close subscriber group (CSG). The paper focuses on proposal of two control procedures which allow an access to CSG in the case of emergency calls.

Design of Radiofrequency Protective Clothing Containing Silver Nanoparticles

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Electromagnetic shielding materials find their use not only at electrical devices construction, but also at personnel protective aids construction of fitters and maintenance workers of power devices under operation. Standards about effects of electromagnetic fields are published and producers manufacture protective aids, suits, etc. especially for antenna systems in microwave frequency bands, which power levels of electromagnetic fields exceed required hygiene limits. However, performance of protective clothing applications is still discussed in radio frequency band. Research of textile material properties shows different ways of production conductive material. Most of them embody some disadvantage considering protective clothing construction, i.e. versatility, peeling, etc. However, using silver nanoparticles increases product manufacture qualities. Therefore the paper focuses on proposal of construction design of protective clothing structure using silver nanoparticles, standardization of effects of electromagnetic fields, measurement and simulations of such material. The results show satisfactory values of electromagnetic shielding efficiency, i.e. about 40 dB (30 MHz – 1.5 GHz). Considering the most unprotected parts, i.e. eyes, mouth and nose, measurement results of hoods reach about 15 dB. Our experiments show the protective clothing can be manufactured form textile material with silver nanoparticles and with breathable and transparent material, which protects eyes, mouth and nose.

Embedded System with RFID Technology and Inductive Proximity Sensor

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Monitoring of technology processes is crucial for quality management and also for effectiveness of following logistics chain to achieve customer expectations and requirements. This leads the author of this paper to develop system for technology monitoring based on RFID and induction proximity sensor, which can be used to monitor and identify movement of goods, components or mechanical parts of the machines in many types of industry. This system has been developed in Centre of Automatic Identification at CTU in Prague. The paper focuses on full description of the system and its evaluation in real operation.

Measurement of Mobile Communication Devices on the Testing Railway Ring

  • Pracoviště: Katedra telekomunikační techniky, Katedra počítačů
  • Anotace:
    Paper describes results from the measurement of the transmission system that is designed for active backup of transmission lines through mobile networks. Measurements have been designed and implemented to verify the ability of uninterruptible data transfer during train movement in places with different quality of mobile networks. Testing was realized on the Small test ring of the Railway Research Institute in Velim. We present the results of the measurement on the physical, link and network layer of the reference model ISO / OSI, including results evaluation.

Modelling of Surface and Bulk Resistance for Wearable Textile Antenna Design

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Antennas and other high frequency structure design influence also textile industry in the form of smart textile applications. One of them calls wearable antennas. Proper design of these antennas includes also modelling based on knowledge of textile material parameters of its functional surface, substrate and structure. Paper focuses on modelling of textile structure with electrically conductive fibres and its verification by optic and DC surface and bulk resistance measurement methods.

Popis stanice

  • Autoři: Ing. Marek Neruda, Ph.D., Prošek, P., Suchánek, A.
  • Publikace: Antarktida. Praha: Academia, 2013. p. 232-239. ISBN 978-80-200-2140-3.
  • Rok: 2013

RFID Textile Antenna and Its Development

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Implementation of textile antennas for RFID tags represents a realistic developmental assignment. The successful operation of such textile antennas mainly requires the mechanical stability of the textile composite, which realizes a RFID tag antenna. A good function of the antenna and thus the sensitivity of the complete tag can be provided for just compliance with the mechanical construction and stability of required dimensions. A good choice of textile material for both electrically conductive structures and the insulating layer of the resultant fabric composite is the most important prerequisite for the successful implementation.

Wearable Textile Electrodes for ECG Measurement

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The electrocardiogram (ECG) is one of the most important parameters for monitoring of the physiological state of a person. Currently available systems for ECG monitoring are both stationary and wearable, but the comfort of the monitored person is not at a satisfactory level because these systems are not part of standard clothing. This article is therefore devoted to the development and measurement of wearable textile electrodes for ECG measurement device with high comfort for the user. The electrode material is made of electrically conductive textile. This creates a textile composite that guarantees high comfort for the user while ensuring good quality of ECG measurements. The composite is implemented by a carrier (a T-shirt with flame retardant) and sensing electrodes embroidered with yarn based on a mixture of polyester coated with silver nanoparticles and cotton. The electrodes not only provide great comfort but are also antibacterial and antiallergic due to silver nanoparticles.

Komunikační systém pro českou antarktickou stanici Johann Gregor Mendel

  • Autoři: Machula, V., Ing. Marek Neruda, Ph.D.,
  • Publikace: Access server. 2012, 11.(201212), ISSN 1214-9675.
  • Rok: 2012
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Článek seznamuje s poslední verzí řešení komunikačního systému na české antarktické stanici. Popisuje především poslední verzi systému, který převzal funkci centrálního komunikačního prvku a aktuální řešení komunikace a sběru dat na stanici. Závěrečná část popisuje řešení komunikace v rámci antarktické stanice, tj. automatizovaný sběr dat z měřicích stanovištích vzdálených od základny několik metrů až kilometrů.

Měření RFID v HF a UHF pásmech

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Vyzvaná přednáška se věnovala problematice meření RFID technologie v pásmech UHF a HF dle příslušných norem.

Modeling of Smart Textile Materials for ESD Applications

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Protection of electronic devices and components against effects of electrostatic discharge is considered as very important part of their production and operating conditions. Many facilities exist such as metal covers and sheets, their grounding, etc. Consumption of specific metal is staggering, therefore modern textile materials can be used instead. Paper focuses on modeling of antistatic textile materials which are compound of non-conductive and conductive fibres. Conductive structure in the textiles enables to distribute the charge and it prevents from undesirable sparks.

Modelling of Electromagnetic Parameters of Planar Textile Materials

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Modern textile materials with increased electric surface conductivity or the ability to shield electromagnetic fields find their application mainly in electrical engineering.

Self-drying Planar Textile Materials with Electrically Conductive Structures

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Smart textiles expand into different industrial areas and they are not only used to wear. Conductive fabrics serve to antenna design, shielding, cable connection or conducting electrical current for self-drying. The paper focuses on design and simulation of drying abilities of highly conductive textile material. Measurement results are subsequently presented and discussed.

Textile Antenna for 50 Ohm Applications

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The new generation of textile materials have the capability to conduct electricity and at the same time be wearable. There are much more applications involved if an antenna is made from parts that are totally wearable. This new property of conductivity in textile materials is used to implement the wireless functions to clothing. In general, the antennas are made of highly conductive metal with is a solid structure, which results in stable output. The challenge with textile antenna is output stability which is given by pure textile material of the radiating element, dielectric material and also ground, which can be can be folded and twisted. The paper presents the design and fabricated output results of the textile antenna which is used for the 50 ohm system (as GPS or WLAN) at 2,45 GHz.

Verification of Surface Conductance Model of Textile Materials

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Surface conductance is one of the main parameters which describes basic characteristics of specific textile materials. These textile materials are used, for example, in environments with higher requirements on hardware electrostatic protection during their production process. Published measurement standardized methods are followed by modeling methods which do not reach satisfactory results. This paper is therefore focused on the modeling of surface conductance of textile materials. The results show that the structure of textile materials can be seen as serial-parallel connections of resistors. A derivation of this model is described.

Autonomous Measurement and Communication System Development Methodology

  • Autoři: Machula, V., Ing. Marek Neruda, Ph.D., Šafránek, M.
  • Publikace: 13th International Conference on Research in Telecommunication Technologies 2011. Brno: VUT v Brně, Fakulta elektrotechniky a komunikačních technologií, 2011. pp. 66-69. ISBN 978-80-214-4283-2.
  • Rok: 2011
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The paper focuses on description of design, development and testing of autonomous device used for data gathering from various types of sensors by proposed design and implementation methodology. The methodology ensures performance of initial requirements, device testing during design and deployment and successful setting in full operation. Device also serving as communication point for measurement part and also for other connected remote units.

Calibration Set for Measuring of Electromagnetic Shielding Efficiency

  • Autoři: Ing. Marek Neruda, Ph.D., doc. Ing. Lukáš Vojtěch, Ph.D., Souček, J.
  • Publikace: 13th International Conference on Research in Telecommunication Technologies 2011. Brno: VUT v Brně, Fakulta elektrotechniky a komunikačních technologií, 2011. pp. 18-22. ISBN 978-80-214-4283-2.
  • Rok: 2011
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Electromagnetic Susceptibility protects electronic devices from unwanted operation or destruction. One of the main instruments can be considered as shielding sheets or barriers. Their effectiveness is measured by parameter called Electromagnetic Shielding Efficiency, which is measured by e.g. standard ASTM D4935-99. It describes dimensions of calibration set, which cannot be bought. Therefore the paper describes design, realization and measurement of calibration set for ESE measurement verification. The importance of ESE value knowledge of different material grows also with the research of effects of electromagnetic field to biological systems.

Communication and Automatic Data Collecting System with a Use of Satellite Network, High Reliability and Low Power cConsumption for Czech Antarctic Station

  • Autoři: Šafránek, M., Ing. Marek Neruda, Ph.D., Chod, J.
  • Publikace: Workshop 2011. Praha: České vysoké učení technické v Praze, 2011.
  • Rok: 2011
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Article is focused on Communication and automatic data collecting system. This system was proposed by scientists from Department of Telecommunication Engineering from CTU in Prague. The first version of system was put into operation on the Czech Antarctic Station of Johann Gregor Mendel in Antarctica. The operation of the system showed new options for innovation of the system. These possibilities for innovation were made into new version of system called BENDER II. The BENDER II is tested in real mode on the Czech Antarctic Station at the beginning of 2011.

Modeling of Textile DC Bulk Resistance for Antenna Design with Electrically Conductive Fibres

  • Autoři: Ing. Marek Neruda, Ph.D., doc. Ing. Lukáš Vojtěch, Ph.D.,
  • Publikace: Proceedings of the 11th International Conference Knowledge in Telecommunication Technologies and Optics. Ostrava: VŠB - TUO, FEI, Katedra elektroniky a telekomunikační techniky, 2011. pp. 199-202. ISBN 978-80-248-2399-7.
  • Rok: 2011
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Development of high frequency applications influences also textile industry with for example wearable antennas. Modeling of these antennas requires knowledge of material parameters of substrates and functional surfaces. This paper focuses on modeling of textile structure with electrically conductive fibres in order to calculate DC bulk resistance. Measurement method is subsequently proposed for model verification.

Planar Materials Electromagnetic Shielding Efficiency Derivation

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Detailed and complete derivation of published models misses in scientific literature and published approximated equations differ from each other in many cases. It can cause unwanted repetition of mistakes in published equations. This paper is therefore focused on derivation of electromagnetic shielding efficiency of planar materials. Derivation obviates discrepancy published in scientific literature and consequently possible incorrect applications in technical practice. Results of modeling and measurement show a strong dependence of shielding efficiency and material electric conductivity and related equivalent sheet model thickness. This result is in accordance with practical experience from EMC branch.

Analyzing of Data Flows at Czech Antarctic Station

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Paper deals with data transmission behind polar circle with respect to multimedia content and reliable data transport. Two different transmission algorithms are discussed in the paper. The first one is common periodic transfer used for transmission of collected data. The second one is transmission on demand trigged by scientists in Czech Republic.

Application of Shielding Textiles for Increasing Safety Airborne Systems - Limitation of GSM Interference

Bezdrátový přenos dat na polárním kruhu

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Vědecké práce v odlehlých částech světa si žádají vhodně navržená komunikační řešení, která umožní splňovat požadavky kladené na konkrétní situaci. Antarktida je jedním z takových míst, které je výzvou pro návrh komunikačního zařízení jak z hlediska extrémních provozních podmínek, tak z hlediska omezených zdrojů energie.

Data Hardware Protection of Electronic Identifiers

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Data protection of personal information contained in electronic identifiers is one of the most important tasks in RFID technology development. This paper is focused on design and development of data hardware protection of electronic identifiers. New developed textile materials based on metallic and polymeric fibers reach electromagnetic shielding efficiency of tens of decibel in a wide frequency spectrum. The paper describes a development of specific application and its testing.

Laboratorní úloha pro měření elektromagnetické stínicí účinnosti

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Nová laboratorní úloha zaměřená na měření stínící účinnosti nových textilních materiálů zvyšuje obecné povědomí o problematice elektromagnetické kompatibility, názorně studentům ukazuje praktické využití daných materiálů a nutí studenty zvyšovat jejich samostatnost při řešení dílčích problémů, jak je vyžadováno v praxi.

Měření parametrů vysokofrekvenčního RFID signálu

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Příspěvek popisuje didaktickou pomůcku a novou laboratorní úlohu pro měření parametrů vysokofrekvenčního RFID signálu.

Optimization of compress algorithm in data satellite networks

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Satelite communication offers voice and data services. Two example designs of data transfer reduction are described. The first one illustrates IP optimization and the second one considers FTP optimization. Different compression methods and ciphering are considered.

Optimization of TCP Satellite Communication in Inmarsat Network

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The purpose of this paper is to present the improvements of packet data transmission via originally only voice oriented Inmarsat satellite network. The window size has been optimized to enable transferring files between the hosts in Inmarsat satellite network with increased throughput and also reduced transfer times.

RF Protective Clothing Developement

  • Autoři: Ing. Marek Neruda, Ph.D., doc. Ing. Lukáš Vojtěch, Ph.D.,
  • Publikace: Proceedings of the 2010 Networking and Electronic Commerce Research Conference. Dallas, TX: American Telecommunications Systems Management Association Inc., 2010. pp. 203-207. ISBN 978-0-9820958-3-6.
  • Rok: 2010
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper is focused on development of protective clothing for personnel maintaining mounting work and service near antenna systems during their full operation.

RFID Lab

Satelitní pracoviště sítě Inmarsat

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Článek se zabývá popisem nově vzniklého pracoviště satelitních technologií. V článku jsou popsány všechny klíčové součásti vybudovaného pracoviště. V první části je provedeno seznámení s použitou satelitní technologií společnosti Inmarsat, na které je celé pracoviště založeno. Další části se věnují popisu ovládání a diagnostiky všech klíčových prvků měřicího pracoviště. Poslední část je věnována aplikacím a úlohám určeným pro toto pracoviště.

Surface Conductance of Textile Materials Modeling

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Main contribution of this paper is in description of a new model of surface conductance and its numerical solution.

Data Networks in the Area of Antarctic Circle

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Antarctica is an area without wired networks. The main instruments for data transfers are wireless networks, especially satellite ones. Their number is naturally limited. In the area of Antarctica there are special conditions such as yearlong low temperatures, limited power sources or period without human presence in the case of Czech base station. The scientists from all over the world try to research land, ice, different kinds of animals and plants, air or UV radiation. They naturally use a lot of kind of devices which help them in their research. The paper describes communication system which ensures yearly data transfer from Antarctica to Czech Republic respectively Internet.

Data Transfer Optimalization via Inmarsat Satellite Network

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The scientists from Czech Republic have started their research in Antarctica in 1927 and it continues up to the present day. In 2007 the first Czech polar base became operational. It is called Czech Mendel's Antarctic Base on James Rosse Island. The scientists use voice and data services. Voice communication is realized via Iridium satellite network. Data services require higher bit rates, which are offered by Inmarsat satellite network. The price for these services depends on specific terminal features and quantity of transferred data. Two example designs are included in order to demonstrate data transfer optimalization. The first one is focused on data IP optimization and the second one considers FTP optimization. Different compression methods and ciphering are considered.

Datové přenosy u polárního kruhu

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    V článku je popsán návrh a realizace komunikačního systému pro antarktickou polární stanici. Článek rovněž popisuje kroky, které bylo nutné učinit pro to, aby mohlo zařízení fungovat ve velmi nehostinných podmínkách, které u polárního kruhu panují.

Digital Signal Processing in Telecommunication Engineering

  • Autoři: Kopp, M., Ing. Marek Neruda, Ph.D.,
  • Publikace: Workshop 09 CTU REPORTS. Praha: České vysoké učení technické v Praze, 2009. pp. 78-79. ISBN 978-80-01-04286-1.
  • Rok: 2009
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper deals with the innovation of the subject Digital Signal Processing in Telecommunication Engineering. The changes were introduced into the education starting the winter period 2008. The improvement of the subject is based on a novel laboratory setup for the digital image and video processing.

Femtocells in 3G Mobile Networks

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The paper discusses usage of femtocell and related challenges, such as interferences, frequency spectrum planning, handovers or integration of femtocells into mobile network.

Femtocells Integration into Mobile Networks

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The paper investigates the influence of femtocells to the traditional mobile network hierarchy and their features.

Full Face Hood for Electromagnetic Shielding

  • Pracoviště: Katedra elektromagnetického pole, Katedra telekomunikační techniky
  • Anotace:
    Two prototypes of human head protective hood were developed in the project called BE-TEX "Human and technology protection against high frequency radiation - research and development of new textiles". Interesting results of shielding efficiency were achieved by specially prepared yarn and suitable construction of full face hood. The shielding efficiency defines an attenuation of high frequency signal after spill by shielding material. Measurement results were gained in 500 MHz frequency range. Electric field intensity was compared for situations with ad without fool head hood.

Laboratorní úlohy pro měření optických a metalických sítí

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    V rámci modernizace předmětu Základní měření ve sdělovací technice X37MST bylo vytvořeno několik laboratorních úloh zaměřených na problematiku datových sítí a přenosu dat. Studenti mají ve všech úlohách za úkol seznámit se s možnostmi analýzy optických a metalických datových sítí založených na technologii Ethernet.

Measurement of electromagnetic shielding efficiency of planar textiles

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    New types of textiles were developed in the project Be-Tex, which is focused on human and technology protection against high frequency radiation. The shielding effectiveness defines an attenuation of high frequency signal after spill by shielding material. These textiles can reduce an effect of intensities of electromagnetic fields, which protect human body.

Napájecí zdroj pro extrémní podmínky

  • Autoři: Zavrtálek, J., Ing. Marek Neruda, Ph.D.,
  • Publikace: Access server. 2009, 7(12), 1-5. ISSN 1214-9675.
  • Rok: 2009
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Článek popisuje speciální napájecí zdroj s širokým rozmezím vstupních napětí s nízkým nárokem na vstupní napájení a minimální vlastní spotřebou. Návrh byl uzpůsoben pro extrémní podmínky napájení komunikačních zařízení na české polární základně.

Technologie HSDPA

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Síť UMTS byla v České republice spuštěna v roce 2005. Od té doby byly vydány nové specifikace, které vedly ke zvýšení přenosových rychlostí. Jedna z technologií se označuje jako HSDPA (High-speed Downlink Packet Access) a umožňuje zvýšit přenosovou rychlost až na 14,4 Mbit/s, resp. 48 Mbit/s v sestupném směru. Tento článek popisuje vlastnosti, kterými disponuje HSDPA ve srovnání s UMTS.

Víceúčelové zařízení pro zajišťování spolehlivé funkce systému pro komunikaci a sběr dat na české polární stanici

  • Autoři: Zavrtálek, J., Ing. Marek Neruda, Ph.D.,
  • Publikace: Access server. 2009, 7.(200902), 0002. ISSN 1214-9675.
  • Rok: 2009
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    Článek se zabývá vlastnostmi a funkcemi zařízení zhotoveného pro řízení a zajištění funkčnosti komunikačního systému na české polární základně v Antarktidě. Podrobněji jsou rozebrány jednotlivé části zařízení včetně podmínek jeho provozu.

Basic Measurements in Telecommunications - Laboratory Courses Innovation

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The main goal of our project is an innovation of laboratory exercises of subject "Basic measurements in communication." A part of our solution is a creation a new laboratory exercises, which comprises in concentrate form basic measurements in telecommunication. There are three new separate measuring workplaces. In this subject students acquaint oneself with basic measuring principles, new technologies and ways of verification of their features.

Digital Image Processing in Education

  • Autoři: Kopp, M., Ing. Marek Neruda, Ph.D.,
  • Publikace: RTT 2008. Bratislava: STU v Bratislave, 2008. ISBN 978-80-227-2939-0.
  • Rok: 2008
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This paper deals with the innovation of the subject Digital Signal Processing in Telecommunication Engineering. The changes will be introduced into the education starting the winter period 2008. The improvement of the subject is based on a novel laboratory setup for the digital image and video processing. Further, new laboratory activities were designed, tested and established. The practical experiments are based on the TMS320C6455 starter kits completed by video daughter boards.

Evolution of 3GPP Core Network

Evolution of 3GPP MAC Layer

Innovation of the Course X32MKS "Mobile communication systems"

  • Autoři: Šafránek, M., Ing. Marek Neruda, Ph.D.,
  • Publikace: RTT 2008. Bratislava: STU v Bratislave, 2008. ISBN 978-80-227-2939-0.
  • Rok: 2008
  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    A boom in mobile communication technologies characterizes the beginning of 21st century. The main goal of the project is innovate educational process of subject "Mobile communication systems" in practical courses. In the project we realize the measuring place for new mobile technology called UMTS (Universal Mobile Telecommunication system) and CDMA-2000. Students will work on this workplace on the independent project and acquaint oneself with basic characteristics of these modern mobile technologies.

Satellite Data Transfer in the area of Antarctic Circle

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    This article deals with the satellite communication system Inmarsat which was installed on the Czech Mendel's Antartic Base on James Rosse Island. The Inmarsat system (at least one part), was tested on the Department of Telecommunications Engineering at Czech Technical University in Prague. Some measurement results are published in this article. The last part is focused on those projects which are able to be resolved by means of this communication system.

Long Term Evolution (beyond UMTS)

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    In order to maintain the future competitiveness of WCDMA technology, 3GPP organization has started a process of defining the long-term evolution (LTE) for 3G. This paper discusses main features of proposed LTE technology.

Protocol MAC-hs in UMTS

  • Autoři: Ing. Marek Neruda, Ph.D.,
  • Publikace: TRANSCOM 2007 - Proceedings, Section 1 - Transport and Communications Technologies. Žilina: University of Žilina, 2007. pp. 173-176. ISBN 978-80-8070-692-0.
  • Rok: 2007

Technology HSUPA

  • Pracoviště: Katedra telekomunikační techniky
  • Anotace:
    The paper is focused on a new technology High-Speed Uplink Packet Access, which is implemented into the telecommunication system of third generation Universal Mobile Telecommunications System.

Za stránku zodpovídá: Ing. Mgr. Radovan Suk