2017, Vol. 19

Browse

Recent Submissions

Now showing 1 - 5 of 30
  • Thumbnail Image
    Item
    Sklízení RF energie v pásmech GSM a Wifi
    (International Society for Science and Engineering, o.s., 2017-12-31) Kokolia, Martin; Láčík, Jaroslav; Raida, Zbyněk
    The paper presents a two-band wearable rectifying antenna operating in the 900 MHz GSM band and the 2.00 GHz ISM band. The rectifier antenna has been designed as a multi-layered structure to reduce size, maintain a sufficient gain and have a sufficiently wide radiation pattern. The rectifier was designed as a voltage doubler to maximize voltage on the load. The manufactured antenna had a gain of 6.3 dBi at 900 MHz and 2.8 dBi at 2.45 GHz. The rectifier worked from -20 dBm and was measured up-to -2 dBm with 19% efficiency for the GSM band and 17% efficiency for the ISM band.
  • Thumbnail Image
    Item
    Autentizace IoT zařízení protokolem OAuth2 nebo HTTP(S) pro ukládání Big Data přes REST API
    (International Society for Science and Engineering, o.s., 2017-12-31) Šeda, Pavel; Mašek, Pavel; Hošek, Jiří
    Currently, the importance of IoT applications in the market is rapidly growing. Depending on this, the importance of proper storage of IoT applications increases, where it is advisable to send data to the server or to receive instructions from it. It is therefore advisable to deal with Big Data and IoT device server authentication, so in this thesis are compared OAuth2 and HTTP(S) protocols for authentication of  IoT device.  The output of this article is a comparison of the speed of data storage when sending data as JSON or XML messages as well as the authentication method via HTTP Digest or OAuth2 protocol.
  • Thumbnail Image
    Item
    Šifrovanie obrazu s využitím logistického zobrazenia
    (International Society for Science and Engineering, o.s., 2017-02-28) Oravec, Jakub; Ovseník, Ľuboš; Turán, Ján
    Secrecy of transmitted information is crucial in some cases. However, conventional ciphering algorithms do not yield desired results when they are used on raster images. One of possibilities for concealing the contents of images is usage of chaotic ciphering algorithms. This article deals with description of one of such algorithms, which is based on usage of logistic map. Proposed algorithm is composed of two steps, confusion and diffusion. The description of algorithm is extended by analysis of yielded results.
  • Thumbnail Image
    Item
    Assessing Parkinson’s disease using prosodic analysis of neutral, stress-modified and rhymed speech
    (International Society for Science and Engineering, o.s., 2017-04-30) Galáž, Zoltán; Kiska, Tomáš; Zvončák, Vojtěch; Mucha, Ján; Smékal, Zdeněk
    Up to 90% of patients with Parkinson’s disease (PD) suffer from hypokinetic dysarthria (HD). One of the most frequent manifestations of HD is dysprosody. Some hidden relations between clinical signs of HD and other motor and non-motor features of PD probably exist. To investigate, whether acoustic analysis of dysarthric speech can provide neurologists and clinical psychologists objective, para-clinical insight into motor and non-motor features of the examined PD patient, 72 PD patients were assessed by 8 clinical rating scales. Prosodic analysis of emotionally-neutral reading, stress-modified reading and poem recitation is performed. Correlation and regression analysis is employed to determine possible relationship between HD and progress of PD. Close relation of monopitch and monoloudness to motor aspects of PD was found. Freezing of gait showed strong connection with speech rate disturbances. Non-motor aspects were found independent of stress and rhythm in speech and strongly associated with speech rate and pausing abnormalities.
  • Thumbnail Image
    Item
    Vplyv absorberov na meranie permitivity materiálov vo volnom priestore pomocou UWB radaru
    (International Society for Science and Engineering, o.s., 2017-10-30) Repko, Miroslav; Gamec, Ján
    This paper focuses on the method of the relative permittivity of the material measurement by the  UWB radar. Especially, this paper focuses on the improvement of the existing method of the obstacle measurement in process of the persons monitoring by the UWB radar. Moreover, this improved method shows the deviation of measurement, in the scenario of measurement without successful condition about transversality on the incident wave. The improvement is based on the suitable position of the absorbers in the place of measurement. By this way, it is possible to attenuate the incident wave in the undesired places, where the curvature of the wavefront is considerable.