Digital Signal Processing

2406 Submissions

[2] viXra:2406.0065 [pdf] submitted on 2024-06-13 20:58:43

Implementation of Brinell Hardness Measurement Device Using Hough Transform in Raspberry pi 3

Authors: Jang Chol Guk, Ra Song Nam, Kim Hyon Jin, Ri Yong Gwang, Yun Jong Gyong
Comments: 8 Pages.

In Brinell hardness measurement, the diameter measurement of the indentation is an important process related to the measurement accuracy.In this paper, a special image input device was designed to input the magnified image of the indentation to increase the accuracy of hardness measurement. Then, a method for determining Brinell hardness according to the indentation diameter obtained by Hough transform on the input image was established and implemented as a device using a single-board computer Raspberry Pi 3. The experimental results demonstrate that the designed measurement device can be used to provide the high accuracy and convenient measurement.
Category: Digital Signal Processing

[1] viXra:2406.0064 [pdf] submitted on 2024-06-13 20:57:46

A Compact CPW-Fed Quintuple -Band-Notched Antenna for UWB Applications

Authors: Kwang Su Kim, Jin Myong Kim, Pok Sol Chae, Song Gwon Ri
Comments: 6 Pages.

In this paper, a compact coplanar waveguide (CPW)-fed quintuple-band-notched antenna for ultra-wideband(UWB) applications is presented. The voltage standing wave ratio (VSWR) results show that the proposed antenna exhibits good wideband performance over an UWB frequency range from 1.4 to 10.7 GHz with VSWR less than 2, except for five stop-bands at 2.1 to 2.6 GHz, 3.3 to 3.75 GHz, 5.15 to 5.85 GHz, 7.2 to 7.6 GHz and 8.15 to 8.52 GHz for filtering the worldwide interoperability for microwave access (WiMAX) systems, wireless local area networks (WLANs), downlink of X-band satellite communication system and ITU band signals, respectively. Good radiation patterns and gain characteristics are obtained in the whole UWB frequency range except the notched frequency bands. The simulation results were compared with the measured results and good agreement is obtained. The proposed antenna provides the simple structure and good characteristics and is suitable for UWB applications.
Category: Digital Signal Processing