Science Journal of Circuits, Systems and Signal Processing

Volume 9, Issue 2, December 2020

  • Comparative Study on Thyristor and Rectifier Circuit Based DC Motor Control with Improved Power Factor and Total Harmonic Distortion

    Salma Nazia Rahman, Tanzina Akter, Mirza Muhammad Yeamin Hossain, Md. Abdullah Al Mahmud

    Issue: Volume 9, Issue 2, December 2020
    Pages: 31-41
    Received: Mar. 17, 2020
    Accepted: Mar. 31, 2020
    Published: Aug. 05, 2020
    Abstract: DC motor is used in many industrial applications. Because it has versatile control characteristics. With the increasing use of power semiconductor units, the speed control of the DC motor is increasingly getting sophisticated and precise. The DC motor can control by various methods, which is as field control, armature voltage control, armature resi... Show More
  • Classical Image Based Classification of Coffee Beans on Their Botanical Origins in Tongo and Wambara, Benishangul Gumuz, Ethiopia

    Lamessa Dingeta Olika, Dejenie Demisse Amberber

    Issue: Volume 9, Issue 2, December 2020
    Pages: 42-48
    Received: Jun. 19, 2020
    Accepted: Jul. 29, 2020
    Published: Aug. 13, 2020
    Abstract: Ethiopia is a homeland of coffee. Coffee is a major export commodity of Ethiopia, which has a significant role in earning foreign currency. This research was conducted with the objective of developing an appropriate computer routine algorithm that can characterize different varieties of Beneshanguel coffee based on their growing region. Imaging tec... Show More
  • Delay Based Auto-Calibrated PVT Monitor System and Method

    Alexandro Giron, Esteban Martinez, Victor Avendaño

    Issue: Volume 9, Issue 2, December 2020
    Pages: 49-58
    Received: Mar. 24, 2020
    Accepted: Apr. 15, 2020
    Published: Sep. 03, 2020
    Abstract: In this paper, an auto-calibrated PVT (process, voltage, temperature) monitoring system based on delay chains and flip-flops is presented. The system and method are proposed to be used by IP’s (Intellectual property) that require to monitor PVT conditions during its operation and depending on the detected changes be configurable or adaptive. The me... Show More