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31,456 Article Results

Digitally fast synchronization of single-phase grid-tied inverter using FPGA

10.11591/ijpeds.v15.i4.pp2452-2461
Afarulrazi Abu Bakar , Balarajan Sannasy , Hazwaj Mhd Poad , Tharnisha Sithananthan , Wahyu Mulyo Utomo , Nor Farisha Diana Rosli
As interest in alternative energy sources grows, grid-connected inverters are getting more advanced. Thus, to synchronize the output waveform of an inverter with the grid supply system, the frequency and phase angle ought to be consistent. This paper presents an enhanced digital implementation controller for a grid-connected inverter using the sinusoidal pulse-width modulation (SPWM) switching technique via an appropriately designed low-pass filter. The main contribution of the proposed digital controller algorithm is to synchronize with the grid for the next half-cycle. The proposed control technique used the integrated response from the zero-crossing detector (ZCD) circuit for every half-cycle to trigger the digital phase-locked loop (PLL) implemented using field-programmable gate array (FPGA). An experimental 100 W single-phase full-bridge inverter prototype tested and validated the proposed control algorithm to prove the switching approach works. From the experimental results, the proposed control algorithm demonstrates synchronization with the grid voltage within 8 ms during startup. Furthermore, it exhibits the ability to adapt to phase changes when subjected to a distorted grid, achieving synchronization within 42 ms. This research also emphasizes synchronization between the grid waveform and the inverter output via the phase angle difference.
Volume: 15
Issue: 4
Page: 2452-2461
Publish at: 2024-12-01

Design and implementation of deep neural network hardware chip and its performance analysis

10.11591/ijra.v13i4.pp485-494
Aruna Pant , Adesh Kumar
The artificial neural network (ANN) with a single layer has a limited capacity to process data. Multiple neurons are connected in the human brain, and the actual capacity of the brain lies in the interconnectedness of multiple neurons. As a specified generalization of ANN deep learning makes use of two or more hidden layers, which implies that a greater number of neurons are required to construct the model. A network that has more than one hidden layer, also known as two or more hidden layers, is referred to as a deep neural network, and the process of training such networks is referred to as deep learning. The research article focuses on the design of a multilayer or deep neural network presented for the target field programmable gate array (FPGA) device spartan-6 (xc6stx4-2t9g144) FPGA. The simulation is carried out using Xilinx ISE and ModelSim software. There are two hidden layers in which (2×1) multiplexer blocks are utilized for processing twenty neurons into the output of ten neurons in the first hidden layer and demultiplexers (1×2) and vice versa. The hardware utilization is estimated on FPGA to compute the performance of the deep neural hardware chip based on memory, flip flops, delay, and frequency parameters. The design is scalable and applicable to various FPGA devices, which makes the work novel. FPGA-based neuromorphic hardware acceleration platform with high speed and low power for discrete spike processing on hardware with great real-time performance.
Volume: 13
Issue: 4
Page: 485-494
Publish at: 2024-12-01

Enhancing power quality: An Adaline algorithm for direct resonance current extraction in shunt active power filter

10.11591/ijpeds.v15.i4.pp2470-2479
Nor Farahaida Abdul Rahman , Muhammad Ammirrul Atiqi Mohd Zainuri , Naeem M. S. Hannoon , Muhamad Nabil Hidayat , Rahimi Baharom , Wan Noraishah Wan Abdul Munim
This paper presents an adaptive linear neuron (Adaline) algorithm designed to extract resonance current from the supply current directly. It aims to reduce the computation burden while upholding efficacy in the extraction process. The approach involves establishing the primary power system, evaluating harmonic and resonance current impacts, formulating efficient extraction strategies based on current waveform characteristics, employing the Adaline algorithm for extraction, and constructing a single-phase shunt active power filter (SAPF) to address harmonic currents and parallel resonance effects. Comparative analysis demonstrates the Adaline algorithm’s precision in extracting current amplitudes pre- and post-SAPF implementation. However, observed disparities in extracted resonance current amplitude may stem from the algorithm’s limitations in capturing low-amplitude signals. While a gain adjustment effectively boosts amplitude. However, it introduces considerable ripple and inconsistency, likely linked to parallel resonance effects. Notably, the SAPF exhibits simultaneous harmonic compensation and resonance damping capabilities. Results affirm the SAPF’s effectiveness in reducing harmonic components across all frequencies, including resonance frequency. Furthermore, resonance damping is crucial for further improving SAPF performance and reducing resonance current. This results in significantly improved waveform quality and reduced total harmonic distortion (THD) and individual harmonic distortion (THDi) values of compensated supply current.
Volume: 15
Issue: 4
Page: 2470-2479
Publish at: 2024-12-01

Advanced control and optimization strategies for a 2-phase interleaved boost converter

10.11591/ijeecs.v36.i3.pp1421-1429
Muhammad Adnan Samad , Usmonov Shukurillo Yulbarsovich , Sultonov Ruzimatjon Anvarjon Ugli , Saima Siddiqui
Renowned for their adeptness in smoothing current flow and maintaining balanced operation, 2-phase interleaved boost converters (IBC) demonstrate remarkable efficiency, especially when confronted with demanding loads. This makes them a preferred choice for high-power applications such as renewable energy systems, high-power supplies, and electric vehicle power trains. In contrast, standard boost converters are typically favored in low-power, low-demand scenarios. The control of a 2-phase IBC involves running two boost converters in parallel but with a phase shift to reduce ripple currents, improve efficiency, and increase power handling capabilities. To ensure stability and optimal performance, the control strategies for these converters focus on achieving balanced operation between the phases. Hence, the control of 2-phase IBC presents a significant challenge due to their non-minimum phase behavior. The core focus of this article is the implementation of a composite model predictive control (MPC) technique to regulate a 2-phase interleaved boost converter. It introduces a novel approach, model predictive sliding mode control (MPSMC), which leverages the strengths of both MPC and sliding mode control (SMC). The benefits of this hybrid method, termed MPSMC, are thoroughly developed and simulated using MATLAB/Simulink. The results, as discussed in the respective section, provide an in-depth understanding of its effectiveness in practical applications.
Volume: 36
Issue: 3
Page: 1421-1429
Publish at: 2024-12-01

Improving efficiency of wireless charging system in electric vehicle using a hybrid ultracapacitor-battery energy storage approach

10.11591/ijpeds.v15.i4.pp2685-2699
Liew Hui Fang , Muhammad Izuan Fahmi Romli , Rosemizi Abd Rahim , Nurhakimah Mohd Mukhtar , Norhanisa Kimpol
This research aims to enhance the efficiency of wireless charging systems in electric vehicles by integrating a hybrid ultracapacitor-battery energy storage solution. Traditional standalone battery-based energy storage systems in wireless charging often face sub-optimal charging efficiency, resulting in extended charging times and reduced energy transfer efficiency. To address this limitation, we propose a hybrid approach that combines the rapid charging capability of ultracapacitor (supercapacitor) with the long-term storage capacity of batteries. The optimal charging range is 0 cm to 2 cm, and the combined output voltage and current are 5 V to 12 V and 0.63 A, respectively. This hybrid energy storage system will significantly boost electric vehicles (EVs) charging efficiency. Our research involves experimental evaluation and data analysis to assess crucial parameters, including charging efficiency, energy transfer efficiency, and charging time. The experimental results are validated and compared against existing battery-only systems, shedding light on the advantages and limitations of the hybrid approach. This study contributes to the optimization of wireless charging systems, enhancing energy transfer efficiency, and promoting the broader adoption of wireless charging technology in electric vehicles.
Volume: 15
Issue: 4
Page: 2685-2699
Publish at: 2024-12-01

Character N-gram model for toxicity prediction

10.11591/ijai.v13.i4.pp4380-4387
Eman Shehab , Hamada Nayel , Mohamed Taha
Molecular toxicity prediction is a crucial step in the drug discovery process. It has a direct relationship with human health and medical destiny. Accurately assessing a molecule’s toxicity can aid in the weeding out of low-quality compounds early in the drug discovery phase, avoiding depletion later in the drug development process. Computational models have been used automatically for molecular toxicity prediction. In this paper, a machine learning-based model has been proposed. TF/IDF representation scheme has been used for N-gram and integrated with simplified molecular-input line-entry system (SMILES). Multiple machine learning classifiers such as logistic regression (LR), support vector machine (SVM), random forest (RF), decision tree (DT), k-nearest neighbors (KNN), AdaBoost, multi-layer perceptron (MLP), and stochastic gradient descent (SGD) classifiers have been implemented. A wide range of N-gram models have been implemented and trigram reported the best results. RF and SVM achieved 85% and 84% accuracy respectively. Comparable to state-of-the-art models, our results are acceptable as we used minimum available resources.
Volume: 13
Issue: 4
Page: 4380-4387
Publish at: 2024-12-01

Global Leadership Initiative on Malnutrition criteria for predicting surgical site infection in elective laparotomy patients

10.11591/ijphs.v13i4.24175
Pauline Octaviani , Yohannessa Wulandari , Febiansyah Ibrahim , Diyah Eka Andayani
Laparotomy surgery patients are at risk for complication including surgical site infections (SSI) which are associated with high morbidity and mortality. Malnutrition has been identified as a risk factor for the occurrence of SSI but preoperative malnutrition identification remains low. The Global Leadership Initiative on Malnutrition (GLIM) has published a new, practical, and easily applicable definition of malnutrition. This study aims to evaluate whether malnutrition according to GLIM criteria is a predictor of SSI in elective laparotomy patients. This prospective cohort study involved 123 subjects aged 18-65 years undergoing elective laparotomy, without diabetes history. Their malnutrition status was assessed using GLIM criteria with bioelectrical impedance analysis (BIA) to evaluate muscle mass. A total 62 subjects were categorized into the malnutrition group and the remaining into nonmalnutrition group and then monitored for the presence of SSI up to 10 days postoperatively. SSI occurred in 13.8% of the subjects. The analysis showed a strong association between malnutrition and SSI in elective post laparotomy (RR 4.6; 95%CI 1.4-15.1; p=0.005). Malnutrition according to GLIM criteria is a significant predictor of SSI in elective post laparotomy patients.
Volume: 13
Issue: 4
Page: 1895-1902
Publish at: 2024-12-01

Guided imitation optimizer: a metaheuristic combining guided search and imitation search

10.11591/ijai.v13.i4.pp4217-4228
Purba Daru Kusuma , Meta Kallista
This paper proposes a novel metaphor-free metaheuristic, namely the guided imitation optimizer (GIO). This metaheuristic combines the guided search and imitation-based search. There are five guided searches and three imitation based searches. Meanwhile, there are three references used in this metaheuristic: global finest, a randomly picked solution among the swarm, and a randomized solution within the search space. GIO is then evaluated by using 23 classic functions that consist of seven high dimension unimodal functions (HDUF), six high dimension multimodal functions (HDMF), and ten fixed dimension multimodal functions (FDMF). Through simulation, GIO is superior to golden search optimizer (GSO), grey wolf optimizer (GWO), puzzle optimization algorithm (POA), and coati optimization algorithm (COA) in handling most of these functions. GIO is the first finest in tackling seventeen functions and second finest in tackling six functions. Tight competition occurs between GIO and COA due to the performance of COA which becomes the second finest in handling most of these functions.
Volume: 13
Issue: 4
Page: 4217-4228
Publish at: 2024-12-01

Robust adaptive sliding mode control of a bidirectional DC-DC converter feeding a resistive and CPL based on PSO

10.11591/ijpeds.v15.i4.pp2397-2408
Julius Derghe Cham , Francis Lénine Djanna Koffi , Alexandre Teplaira Boum , Ambe Harrison
A DC-DC converter functioning in bidirectional (two-way) mode is a crucial component of direct current (DC) microgrids since it allows electricity to flow in both directions. However, because of load changes and other factors, the DC-bus voltage might become unstable. This research proposes a robust adaptive controller for a half-bridge two-way DC-DC converter founded on particle swarm optimization (PSO). Using a DC-DC half-bridge bidirectional converter, the effectiveness of various conventional and proposed control techniques is investigated. In comparison to a conventional sliding mode controller (CSMC), it is found that a PSO-based sliding mode control with an adaptive law is the optimal control approach for a bidirectional half-bridge DC-DC converter. This is because minimal steady-state error and the shortest rising and settling times are guaranteed. The benefits of robustness, chattering reduction, and simple design are combined in the suggested controller, which is especially beneficial when dealing with load and input voltage changes. The controller ensures robustness and stability in the face of parameter changes. Numerical simulations conducted in a MATLAB-Simulink environment on a DC-DC half-bridge converter operating in bidirectional mode show the controller's improved performance over its existing counterpart.
Volume: 15
Issue: 4
Page: 2397-2408
Publish at: 2024-12-01

Efficient deep learning models for Telugu handwritten text recognition

10.11591/ijeecs.v36.i3.pp1564-1572
Buddaraju Revathi , B. N. V. Narasimha Raju , Boddu L. V. Siva Rama Krishna , Ajay Dilip Kumar Marapatla , S. Suryanarayanaraju
Optical character recognition (OCR) technology is indispensable for converting and analyzing text from various sources into a format that is editable and searchable. Telugu handwriting presents notable challenges due to the resemblance of characters, the extensive character set, and the need to segment overlapping characters. To segment the overlapping characters, we assess the width of small characters within a word and segment the overlapping characters accordingly. This method is well suited for the segmentation of overlapping compound characters. To address the recognition of similar characters with less training periods we have used ResNet 18 and SqueezeNet models which have achieved character recognition rates of 95% and 94% respectively.
Volume: 36
Issue: 3
Page: 1564-1572
Publish at: 2024-12-01

Machine learning prediction of quality of life: Insight from property crime and tropical climate analysis

10.11591/ijai.v13.i4.pp4509-4515
Anis Zulaikha Mohd Zukri , Siti Rasidah Md Sakip , Suraya Masrom
The study addresses the prediction of quality of life, leveraging machine learning models with a focus on health, socioeconomics, subjective well-being, and environmental indicators. Thus, this study aims to evaluate the efficacy of machine learning in quality-of-life prediction based on property crime and temperature. Five machine learning algorithms were used to be empirically compared namely generalized linear model (GLM), random forest (RF), decision tree (DT), gradient boosted tree (GBT) and support vector machine (SVM) are compared empirically. The performance of each machine learning algorithm in predicting the quality of life has been observed based on the attributes of property crime and tropical climate (temperature). Despite initial low correlation with quality of life, temperature significantly contributes to specific algorithms, enhancing predictive accuracy. This shows the complexity of machine learning impacts. SVM emerges as the best-performing algorithm, followed by RF and DT. The findings highlight the importance of seemingly unrelated factors in prediction outcomes. This paper presents a fundamental research framework useful for helping educators and researchers to explore in depth quality of life prediction with using property crime and temperature as a factor. 
Volume: 13
Issue: 4
Page: 4509-4515
Publish at: 2024-12-01

Probing the depths: assessing the efficacy of the two-tier deception-driven security model

10.11591/ijeecs.v36.i3.pp1631-1639
Anazel P. Gamilla , Thelma D. Palaoag , Marlon A. Naagas
In the age characterized by relentless cyber threats, the need for innovative and proactive security measures has never been more important. Deception is defined as the deliberate structure of tricks, traps, and false information to mislead and discourage threats, while providing timely warning signals and useful information to defenders. The two-tier deception-driven security model's implementation focuses on applying deception security techniques to deceive potential attackers and protect network resources, with an emphasis on a proactive defense approach. The study emphasized the deployment and deep testing of the model, which aims to assess its efficacy and feasibility in real-time practice. The study shows that the two-layered approach effectively defends the network within the multiple layers using a combination of decoys, honeypots, and deceptive network segments. The deception security model effectively prevents and confuses potential threats, improving the network's overall resilience and threat defense capabilities. The findings suggest that integrating deception techniques into cybersecurity frameworks can provide a robust layer of protection against evolving cyber threats. Furthermore, this research contributes to the ongoing discourse on proactive cybersecurity strategies and offers practical insights for improving network defense mechanisms.
Volume: 36
Issue: 3
Page: 1631-1639
Publish at: 2024-12-01

Fusion algorithms on identifying vacant parking spots using vision-based approach

10.11591/ijeecs.v36.i3.pp1640-1654
Ginanjar Suwasono Adi , Hertog Nugroho , Griffani Megiyanto Rahmatullah , Muhammad Yusuf Fadhlan , Dinan Mutamaddin
In densely populated cities, parking space scarcity results in issues like traffic congestion and difficulty finding parking spots. Recent advancements in computer vision have introduced methods to address parking lot management challenges. The availability of public image datasets and rapid growth in deep learning technology has led to vision-based parking management studies, offering advantages over sensor-based systems in comprehensive area coverage, cost reduction, and additional functionalities. This study presents an innovative fusion algorithm that integrates object detection with occupancy state algorithms to accurately identify vacant parking spaces. The employment of the YOLOv7 framework for vehicle instance segmentation, combined with three occupancy algorithms Euclidean distance (ED), intersection over reference (IoR), and intersection over union (IoU) are compared to determine the occupancy state of observed areas. The proposed method is evaluated using the CNRPark-EXT dataset, and its performance is compared with state-of-the-art methods. As a result, the proposed approach demonstrates robustness under varying conditions. It outperforms existing methods in terms of system evaluation performance, achieving accuracies of 98.88%, 97.99%, and 90.04% for ED, IoR, and IoU, respectively. This fusion detection method enhances adaptability and addresses occlusions, emphasizing YOLOv7’s advantages and accurate shape approximation for slot annotation. This study contributes valuable insights for effective parking management systems and has potential usage in the real-world implementation of intelligent transportation systems.
Volume: 36
Issue: 3
Page: 1640-1654
Publish at: 2024-12-01

Performance analysis of fifteen level reduced device count asymmetrical multilevel inverter

10.11591/ijpeds.v15.i4.pp2243-2252
Murugesan Manivel , Lakshmanan Palani , Sivaranjani Subramani , Bharani Prakash Thiagarajan , Divya Kannusamy , Jebakumar Immanuel Devasahayam , V. J. Vijayalakshmi
In this article, a fifteen-level reduced device count asymmetrical multilevel inverter is introduced for electric vehicle applications. This novel multilevel inverter topology minimizes the power switches required. Control of the proposed inverter is accomplished via the nearest-level control method. In a typical multilevel inverter, ten to twelve switches are used to create the fifteen levels. A high number of switches are used in traditional multilevel inverters, which increases the distortion from all harmonics, switching losses, cost, and cost per switch. Only nine switches are needed for the suggested architecture. It significantly minimizes the total harmonic distortion by 5% and lowers the switching losses, low-order harmonics, and complexity. The efficiency of the suggested multilevel inverter (MLI) is 98.35%.
Volume: 15
Issue: 4
Page: 2243-2252
Publish at: 2024-12-01

Electrical circuit approaches to modeling brain chaos: insights into neural dynamics

10.11591/ijeecs.v36.i3.pp1503-1511
Kaouther Selmi , Kods Bachta , Kais Bouallegue
This paper investigates the simulation of brain chaos dynamics using a combination of the Chua circuit and diode tunnel mechanisms, aiming to examine chaotic behavior in brain networks. Leveraging the inherent chaotic properties of the Chua circuit, Fitzhugh-Nagumo (FHN) function and the nonlinear characteristics of diode tunneling, our model offers a platform to mimic the intricate synaptic interactions observed in the brain. By subjecting the model to various stimuli and perturbations, we analyze the emergence and evolution of chaotic patterns, shedding light on the underlying mechanisms of cerebral chaos. Through numerical simulations and experimental validation, we demonstrate the effectiveness of our approach in replicating key features of brain chaos and highlight its potential implications for understanding neurological disorders and cognitive processes. This research contributes to the broader effort of leveraging computational models to explore the complex dynamics of the brain and their implications for neuroscience and microengineering.
Volume: 36
Issue: 3
Page: 1503-1511
Publish at: 2024-12-01
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