Electrical and Electronic Engineering, Control and Systems Engineering, Safety, Risk, Reliability and Quality, Agricultural and Biological Sciences
22
Scopus Publications
Scopus Publications
Data Transmission of LoRa as Wireless Sensor Network for Integrated Krakatau Observatory Network Journal of Electrical and Electronics Engineering, 2025
Vegetation Characteristics and the Estimation of Above-Ground Biomass and Carbons Stock in Petengoran Mangrove Forest, Lampung Bay, Indonesia Ladiva Nirmala Ulvan, Indah Trisnawati, Melvi Ulvan, Ardian Ulvan 2024 IEEE International Workshop on Metrology for Agriculture and Forestry Metroagrifor 2024 Proceedings, 2024 Mangrove is an important blue carbon ecosystem that plays a significant role in mitigating climate change. They are known for their ability to absorb and store atmospheric carbon into the biomass. In this study, the above-ground biomass, carbon stock, and the relationship between vegetation characteristic (density and canopy coverage) and carbon stock are examined. Allometric equations were used to obtain carbon stock values in four zones of Petengoran Mangrove Forest. Three species were identified at the research site. The order of their contribution to the overall carbon stock was Rhizophora apiculata > Rhizophora mucronata > Sonneratia alba. The average above-ground biomass obtained was 114.616 t/ha, while the carbon stock was 53.870 t C/ha. It was also seen that different density and canopy coverage in each zone contributed to regional variations in the value of the carbon stock, demonstrating that the characteristics of vegetation affect the values of the carbon stocks.
Design of Eddy Gas Analyzer as Carbon Sensing Device to Measure CO2 Gas in Oil Palm Plantation Ardian Ulvan, Hana Yunus Putri, Mona Arif Muda Batubara, Aryanto, Heru Pranoto, Melvi 2024 IEEE International Workshop on Metrology for Agriculture and Forestry Metroagrifor 2024 Proceedings, 2024 Climate change and global warming are pressing issues, with CO2 being a primary driver. Oil palm plantations are often associated with significant CO2 emissions due to deforestation, peatland exploitation, and mill operations. To support mitigation efforts and enhance sustainability in the oil palm industry, accurate and continuous monitoring of CO2 concentrations is crucial. This work presents the design, implementation, and testing of an IoT -based device called the Eddy Gas Analyser, which measures the concentration of CO2 gas and related weather variables. This analyser serves as a key component in the eddy covariance method, one of the most accurate and non-destructive techniques for measuring carbon emissions. The Eddy Gas Analyser utilizes industrial-grade micro controllers and CO2 sensors, along with sensors for water vapor, temperature, humidity, and barometric pressure. While not a complete eddy covariance system (as it lacks a 3D wind speed sensor), this device provides essential data for CO2 flux calculations. The IoT integration allows for real-time data transmission and remote monitoring, potentially enabling more widespread and cost-effective deployment compared to traditional systems. Two Eddy Gas Analyser units were installed at heights of 1m and 7m on a 31m meteorological tower in an oil palm plantation. Commissioning tests conducted over a 7-day period demonstrated the functionality, durability, and reliability of the devices. The results showed distinct CO2 concentration patterns at different heights, highlighting the potential for this system to capture vertical CO2 gradients. This study lays the groundwork for a more comprehensive eddy covariance system and represents a step towards developing low-cost, innovative solutions for monitoring carbon emissions in agricultural settings. Future work will focus on integrating 3D anemometer measurements and extending the monitoring period to capture long-term trends and seasonal variations.
Design of A Low Cost Three Dimensional Anemometer Device for Carbon Flux Measurement Melvi, Setiawan Margo Waluyo, Irfan Mirda, Muhammad Rafif Musyaffa, Mona Arif Muda Batubara, Aryanto, Heru Pranoto, Ardian Ulvan 2024 IEEE International Workshop on Metrology for Agriculture and Forestry Metroagrifor 2024 Proceedings, 2024 Eddy covariance method has been widely used to measure the flux of CO2 gas exchange between ecosystems and the atmosphere, typically employing gas analysers and 3D anemometers. However, the high cost of these devices often limits their widespread application. This research aims to design and build an affordable 3D anemometer using low-cost airspeed sensors. Our main objective is to develop a 3D anemometer device capable of measuring three-dimensional wind speed and direction, and to perform data acquisition for potential use in carbon flux measurements. The research method employed is experimental, involving the design, manufacture, and direct application of the device in a palm oil plantation. We present a novel design using six digital airspeed sensors arranged in a 3D Cartesian coordinate system. The device utilizes an Arduino Portenta H7 microcontroller for data acquisition and Raspberry Pi 5 for data logger and data transmission. The device's design minimizes aerodynamic interference, and the sensors were calibrated to ensure accurate readings. Our results demonstrate the successful construction of a 3D anemometer device with a power consumption of 2.2 Wh, reflecting achievements in both power efficiency and cost-effectiveness. The commissioning test was done for 7 days, in which the device was tested on measuring the speed and direction of carbon flux continuously for 40 minutes in every hours. The system achieved a data acquisition success rate of 99.93%, demonstrating high reliability. Additionally, we present raw data visualizations and discuss the device's ability to measure wind speed and direction in all three dimensions. These findings support the potential application of 3D anemometer devices in understanding and monitoring ecological processes involving changes in carbon dioxide in the environment. Although this initial test focused on raw sensor data, future work will include direct comparisons with state-of-the-art 3D anemometers and demonstration of its application in eddy covariance measurements The results indicate that this low-cost solution holds promise for practical use in environmental monitoring and agricultural applications.
Proportional and Simultaneous Control System Design for Portable Ventilators Based on Internet of Things Aryanto, Ardian Ulvan, Melvi Aip Conference Proceedings, 2022 This research is about proportional and simultaneous monitoring of real-time ventilator automation systems based on the Internet of Things. The ventilator has a crucial role in the world of critical health, where its role is a substitute for respiratory function/ventilation for patients with respiratory function disorders. A ventilator is a means of breathing with negative or positive pressure that produces controlled air in the airway so that the patient can maintain ventilation and oxygen administration for a long time. The research method is by adding a breathing sensor per minute to measure the air pressure entering the ventilator, the ESP8266 Module as the controller. The research objective was to combine a simple ventilator system, monitoring with a smartphone in one device (standalone) wirelessly connected without a cable channel. Based on the design of the ventilator breathing apparatus, the tool can be done in real- time continuously for 5 days with breathing per minute on average it is 20 breaths per minute (normal human).
PREFACE Iop Conference Series Materials Science and Engineering, 2019 PREFACE The 4th International Conference on Science, Technology and Interdisciplinary Research (IC-STAR 2018) was organized by University of Lampung, in Tanjung Pandan, Belitung, Indonesia, on August, 29th - 30th 2017. Following the successful of previous events, IC-STAR 2018 shared and highlighted the original and novel ideas, significant advances, the technological state-of-the-art, current status, and future challenges on all aspects related to the research and development in the field of science, engineering and technology, and their inter-discipline cross-linked. IC-STAR 2018 accomplished as a forum for information dissemination, gathering, and networking for academia, researchers, engineers, and professionals within the areas. The conference also provided advanced orientation and understanding for related industries and academia to looking across industrial partnerships, business strategic, and policy and regulations, including the environmental awareness and the mitigation of natural disasters. One of the most important outcomes of IC-STAR 2018 was the understanding to emphasize Krakatau and its potential disaster as a common issue and interest. List of Editorial board, IC-STAR 2018 Committee and Conference Photographs are available in this pdf.
Combined centralised and distributed mechanism for utilisation of node association in broadband wireless network A Ulvan, M Ulvan, H Pranoto Iop Conference Series Materials Science and Engineering, 2018 Mobile broadband wireless access system has the stations that might be fixed, nomadic or mobile. Regarding the mobility, the node association procedure is critical for network entry as well as network re-entry during handover. The flexibility and utilisation of MAC protocols scheduling have an important role. The standard provides the Partition Scheme as the scheduling mechanism which separates the allocation of minislots for scheduling. However, minislots cannot be flexibly reserved for centralised and distributed scheduling. In this paper we analysed the scheduling mechanism to improve the utilisation of minislots allocation during the exchange of MAC massages. The centralised and distributed scheduling is implemented in some topology scenarios. The result shows the proposed mechanism has better performance for node association than partition scheme.
Downlink power control for interference management in femtocell-macrocell cellular communication network Misfa Susanto, Dika Fauzia, Melvi, Syaiful Alam Qir 2017 2017 15th International Conference on Quality in Research Qir International Symposium on Electrical and Computer Engineering, 2017 Deployment of femtocell in macrocell cellular network which forms two-tier femtocell-macrocell cellular network faces more complicated interference problems, since it uses the same licensed frequency spectrum as its macrocell. This paper addresses the interference problems for downlink transmission in such two-tier cellular communication network. In this paper, interference management using power control is proposed in that two-tier network. This paper considers multi-cell cellular network composing of three macrocell systems. Ten femtocells are deployed in each macrocell system. This paper takes worst case for the scenario that is all femtocells and macrocells in downlink transmissions. Simulation for the system without power control was carried out first as a baseline system. Then, two methods of power control called as PC-1 and PC-2 in this paper were explored to reduce the interference effects. The use of two power controls is to take a trade-off, the increasing of quality of service (QoS) in macrocell system while is not degrading much QoS in femtocell system. Both power control methods are based on the estimated Signal to Interference Plus Noise Ratio (SINR). Both of power control methods also ensure that the results of controlled transmitting power will not exceed the maximum or the minimum of allowable transmitting powers. Simulations have been carried out and performance parameter in term of Cumulative Distribution Function (CDF) of SINR have been collected for co-tier (femtocell-femtocell and macrocell-macrocell), cross-tier (femtocell-macrocell and macrocell-femtocell), and the total interferences. The simulation results show that both power control methods outperform the baseline system.
Spectrum-less communication by virtualizing the core network of 4G wireless network Arpn Journal of Engineering and Applied Sciences, 2017
The analysis of signalling process of the services in integrated IMS Arpn Journal of Engineering and Applied Sciences, 2016
Integrated IMS-femtocell testbed Ardian Ulvan, Melvi Ulvan, Robert Bestak 2013 36th International Conference on Telecommunications and Signal Processing Tsp 2013, 2013
Handover scenario and procedure in lte-based femtocell networks Ubicomm 2010 4th International Conference on Mobile Ubiquitous Computing Systems Services and Technologies, 2010
IMS signalling in lte-based femtocell network Ubicomm 2010 4th International Conference on Mobile Ubiquitous Computing Systems Services and Technologies, 2010
The study of IMS functionality in femtocell environment Melvi Ulvan, Robert Bestak, Ardian Ulvan Proceedings Micc 2009 2009 IEEE 9th Malaysia International Conference on Communications with A Special Workshop on Digital Tv Contents, 2009
