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10 results on '"Nugroho, Endang Retno"'

3. Directional Flat Panel Antenna Design for Analog to Digital TV Broadcast Transition in Indonesia

Author

Nugroho, Rianto, Ruliyanta, and Nugroho, Endang Retno

Subjects
Digital TV, HFSS, Flat Panel Antenna, Directional, DVB-T2
Abstract

The television industry in Indonesia is currently in a transition phase from analog broadcasts to digital broadcasts. This study aims to design and manufacture directional flat panel antennas that optimize digital broadcast reception at frequencies in the 450-700 MHz range and produce optimal gain, return loss, bandwidth, and VSWR (voltage standing wave ratio) values in the manufacture of antennas using PCB with double layer FR4 Epoxy type with a thickness of 1.6 mm and a dielectric constant value of 4.4. The design of this dimensional antenna uses mathematical analysis. It is simulated with Ansys High-Frequency Structural Simulator (HFFS) software version 13 until the final optimization results are obtained according to the desired specifications. The design results with Ansys HFSS obtained a frequency range of 395 MHz to 821 MHz, in other words, a wide bandwidth of 426 MHz, a gain of 3.68 dB, a return loss of -14.0447 dB, and a VSWR of 1.4954. The results of the handmade antenna design obtained a frequency range between 410 MHz to 805 MHz or a bandwidth of 395 MHz, a gain of 3.85 dB, a return loss of -18.612 dB, and a VSWR of 1.26. Based on the test analysis results, the directional flat panel antenna design has better parameter values ​​than previous studies.

Published
2023

7. Industrial internet of things solution for monitoring ammonia and carbon monoxide in industrial staging areas.

Author

Diana, Arina Rose, Nugroho, Endang Retno, Wicaksono, Sandy Rachmat, and Azman, Novi

Subjects
*CARBON monoxide, *INTERNET of things, *GAS cylinders, *GAS leakage, *HUMAN activity recognition, *LEAK detection, *WORK-related injuries
Abstract

Hazardous gas leaks are currently leading the cause of industrial accidents. Human activities in industrial areas, especially when conducting inspection using a Gas Cylinder containing CO and NH3 which are invisible and have a negative impact on health with Permissible Exposure Limit 50 ppm. Due to the risks of gas leakage, some solution to minimize the risk to human health is needed. There are still many conventional gas leak detections which no regular and real-time monitoring. To overcome this, a CO & NH3 gas monitoring and detection system were designed in the staging area which can automatically be monitored remotely based on the Internet of Things (IoT). The sensors used are MQ-7 to measure CO gas concentration and MQ-135 sensors to measure NH3 gas concentration. Gas concentration status will be monitored via the web in real-time and notification of each gas status will be sent via Telegram. Once the gas concentration is exceeding the safe limit, it will turn the DC fan on. Buzzer and LED are used as indicators of gas condition status in the room. Are better for continuing this study also monitor other parameters like room temperature for making more safer environment for workers. [ABSTRACT FROM AUTHOR]

Published
2022
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8. Optimization of electric load flow at Jakarta International Stadium with Newton Raphson method.

Author

Ruliyanta, Ruliyanta, Keraf, Adhyartha, Nugroho, Endang Retno, and Amanda, Seprita

Subjects
NEWTON-Raphson method, CAPACITOR banks, STADIUMS, ELECTRICAL load
Abstract

Jakarta International Stadium is a multi-function stadium which has a building area of 222,940 m2 consisting of nine floors and can accommodate 82,000 spectators. In this study, the optimization level of the power flow (load flow) with the Newton Raphson method will be seen and calculate the short circuit current referring to the IEC International Electrotechnical Commission (IEC) standard, namely IEC 60909.1 to IEC 60909.4 standards. Optimization is done by adding a 300 kVAR Capacitor Bank and tapping a 2% transformer on the west side panel and adding a 480kVAR capacitor bank and 2.5% tapping transformer on the east side panel. The optimization results resulted in a decrease in current at a voltage of 20 kV from 193.9 Ampere to 173.3 Ampere or a decrease of 20.6 Ampere, this decrease reached 10.62%. [ABSTRACT FROM AUTHOR]

Published
2022
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