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31,042 Article Results

Reconfigurable ultra-wideband hexagonal antenna with two notched-band features for wireless applications

10.12928/telkomnika.v23i6.27047
Khaled; Azzaytuna University B. Suleiman , Akrem; College of Computer Technology Zawiya Asmeida , Shipun; UTHM University Anuar Hamzah , Mohd Shamian; UTHM University bin Zainal
Owing to the demand for frequency agility, a switchable ultra-wideband (UWB) hexagonal antenna was developed in this study. The proposed antenna features two notch filters introduced by two U-shaped slots on the patch to reduce interference from other wireless networks by rejecting the unique frequency bands. In addition, the proposed antenna comprises a hexagonal radiator attached to a feeding 50 Ω standard microstrip line. To fabricate the antenna prototype, a substrate (Rogers RT/Duroid 5880) with loss tangent and relative permittivity values of 0.0009, and 2.2, respectively, was used. Frequency and pattern reconfigurability were achieved by changing the electrical equivalent circuit of two positive-intrinsic-negative (PIN) diodes sandwiched within two U-shaped slots. The evaluation confirmed that the antenna operated within the D1&D2-ON configuration across the entire UWB range while, effectively filtering the wireless body area network (WBAN) (6.10–6.56 GHz) and radar application (9.16–10.79 GHz) bands when both diodes were OFF. The radiation efficiency and gain reached values of 92.9 % and 7.5 dB, respectively. The proposed design offers a robust performance with enhanced interference rejection. This makes it suitable for modern cognitive radio systems.
Volume: 23
Issue: 6
Page: 1439-1448
Publish at: 2025-12-01

Scaling of Facebook architecture and technology stack with heavy workload: past, present and future

10.11591/ijict.v14i3.pp772-782
Tole Sutikno , Laksana Talenta Ahmad
Leading social media Facebook has improved its architecture to meet user needs. Facebook has improved its systems to handle millions of users with heavy workloads and large datasets using innovative architectural solutions and adaptive strategies. The study examines Facebook’s architectural and technological advances in heavy workload and big data. To understand how Facebook scaled with a growing user base and data volume, history and system architecture will be examined. It will also examine how cloud storage and high-performance computing optimize resource utilization and maintain performance during peak user activity. Facebook is managing big data and heavy workloads with new technologies like the hybrid communication model that uses PULL and PUSH strategies for real-time messaging. Facebook switched from HBase to MyRocks for message storage to improve performance as data grew. Architectural scaling and technology stack research must prioritize data storage innovations and optimized communication protocols to handle heavy workloads and big data. The messenger Sync protocol reduces network congestion and improves synchronous communication, reducing resource consumption and maintaining performance under high load. High-performance computing (HPC) and cloud storage should be studied together to support complex compute workflows. This convergence may improve large-scale application infrastructures and encourage interdisciplinary collaboration for scalable and resilient systems.
Volume: 14
Issue: 3
Page: 772-782
Publish at: 2025-12-01

Design and analysis of a new scheme of the FOSTA for DFIG based wind turbine

10.12928/telkomnika.v23i6.27222
Kheira; Tahar Moulay University of Saida Belgacem , Houaria; Tahar Moulay University of Saida Abdelli , Mebarka; Tahar Moulay University of Saida Atig , Abdelkader; Tahar Moulay University of Saida Mezouar
An super-twisting algorithm (STA)-based controller was designed and implemented in this study to achieve precise control over the stator active and reactive power of a doubly fed induction generator (DFIG)-equipped wind turbine device. The fractional calculus theory (FCT) allowed the STA to maximize its effectiveness and performance. A distinct form is sent to the FCT-based STA controller. The stator flux orientation technique uses control that is independent of stator active and reactive powers. In order to achieve a quick system with sufficient precision and a robust control strategy, the hybrid method control is based on the fractional-order super twisting algorithm (FOSTA) and FCT. To demonstrate the performance, efficacy, and resilience of the stated nonlinear approach, a number of simulations are provided.
Volume: 23
Issue: 6
Page: 1696-1705
Publish at: 2025-12-01

The effectiveness of bentonite in reducing soil resistance in acidic water swampland

10.12928/telkomnika.v23i6.27094
Dian; Universitas Sriwijaya Eka Putra , Muhammad; Sriwijaya University Irfan Jambak , Zainuddin; Sriwijaya University Nawawi
This study aims to evaluate the effectiveness of bentonite mixtures in reducing grounding resistance in acidic swampy areas. The method used is an experiment comparing resistance before and after the addition of bentonite in various compositions (25%, 50%, 75%, and 100%), supplemented with linear regression analysis. The results showed that bentonite significantly reduced soil resistance in three types of electrodes: iron rebar, copper-coated iron, and galvanised iron. The highest reduction in resistance was achieved in iron rebar electrodes, from 35.93 Ω to 22.46 Ω (a 37% reduction) with the addition of 25% bentonite. Linear regression analysis showed a consistent negative relationship between the percentage of bentonite and grounding resistance, with a coefficient of determination (R²) varying between 26.40% and 73.39%. These findings indicate that bentonite is effective as a natural grounding material in acidic swampy areas. This research makes an important contribution to the development of more efficient and safer electrical systems in swampy areas and challenging environments, while also supporting the use of natural materials to reduce dependence on synthetic chemicals.
Volume: 23
Issue: 6
Page: 1657-1665
Publish at: 2025-12-01

Automatic diagnosis of rice plant diseases using VGG-16 and computer vision

10.12928/telkomnika.v23i6.26975
Al-Bahra; University of Raharja Al-Bahra , Henderi; University of Raharja Henderi , Nur; University of Raharja Azizah , Muhammad; Yarsi Pratama University Hudzaifah Nasrullah , Didik; STIE Arlindo Setiyadi
Pathogens are organisms that cause disease in plants. In the case of rice, these pathogens can include fungi, bacteria, nematodes, protozoa, and viruses. This study aims to investigate rice plant diseases using a hybrid system that employs the visual geometry group-16 (VGG-16) architecture and computer vision techniques, alongside various optimization algorithms and hyperparameters. We utilize the convolutional neural network (CNN) architecture of VGG-16 for feature extraction, implementing a process known as transfer learning. Additionally, this research compares different optimization algorithms with the VGG-16 model to identify the most effective optimization for the CNN architecture applied to the tested dataset. The main contribution of this study is the development of a model for identifying rice plant diseases based on data collected using VGG-16 for feature extraction and neural networks for classification with specific parameters. Our findings indicate that the best optimization algorithm is stochastic gradient descent (SGD) with momentum, achieving training and validation loss results of 0.173 and 0.168, respectively. Furthermore, the training and validation accuracies were 0.95 and 0.957. The model’s performance metrics include an accuracy of 95.75, precision of 95.75, recall of 95.75, and an F1-score of 95.73.
Volume: 23
Issue: 6
Page: 1600-1610
Publish at: 2025-12-01

Performance enhancement of PV generator using a sensor based dual axis solar tracking system in Algeria

10.12928/telkomnika.v23i6.26872
Sakina; Udes/Centre De Développement des Énergies Renouvelables (CDER) Atoui , Harb; University of Algiers 1 Benyoucef Benkhedda Hadjer , Belaïd; University of Algiers 1 Benyoucef Benkhedda Abdelghani
This article presents the implementation of a two-axis solar tracking system and its impacts to increase the performance of the photovoltaic system in northern Algeria. The system enhances the efficiency of solar systems by optimizing their exposure to sunlight making the sunbeam perpendicular to solar panel. The main objective of the study is to develop a technically proficient and economically viable solution to increase solar energy production. The design relies on integrating light sensors and motors controlled by an Arduino board, enabling automatic adjustment of solar panel positions. This approach offers dynamic and precise orientation, based on light dependent resistor (LDR) sensor design and threshold value, resulting in a significant increase in energy output. The results show that the dual-axis solar tracking system can capture 60.64% more solar energy, taking into account the power consumption of the two electric actuators. The findings of this study will positively influence the promotion of clean and sustainable energy sources while providing a practical solution for more efficient utilization of solar energy in Algeria.
Volume: 23
Issue: 6
Page: 1706-1717
Publish at: 2025-12-01

A hybrid ARIMA and DNN approach with residual learning for electric vehicle charging demand forecasting

10.12928/telkomnika.v23i6.27219
Wahyu; National Research and Innovation Agency (BRIN) Cesar , Dwidharma; National Research and Innovation Agency (BRIN) Priyasta , Prasetyo; National Research and Innovation Agency (BRIN) Aji , Melyana; National Research and Innovation Agency (BRIN) Melyana , Agus; National Research and Innovation Agency (BRIN) Suprianto , Osen; National Research and Innovation Agency (BRIN) Fili Nami , Riza; National Research and Innovation Agency (BRIN) Riza
The rapid growth of electric vehicle (EV) adoption has created significant challenges for power grid management and charging infrastructure planning. Accurate forecasting of EV charging demand is therefore essential to ensure reliable electricity supply and effective station deployment. This study proposes a novel hybrid forecasting framework that combines autoregressive integrated moving average (ARIMA) with deep neural networks (DNN) through a residual learning strategy. In this approach, ARIMA models the linear temporal patterns, while DNN captures the nonlinear residuals, resulting in improved efficiency and predictive accuracy. The proposed hybrid model is one of the first applications of the residual learning approach for EV demand forecasting in Indonesia. Experimental evaluation using real-world daily consumption data shows that the hybrid method achieved the highest prediction accuracy of 98.22%, consistently outperforming single-model baselines. Beyond technical performance, the model can support stakeholders in planning charging infrastructure and help maintain grid stability in rapidly growing EV ecosystems.
Volume: 23
Issue: 6
Page: 1555-1565
Publish at: 2025-12-01

Prospective classroom teachers’ views on instructional technologies and web-based digital educational tools

10.11591/ijere.v14i6.34918
Görkem Avcı , Elvan Subaşıoğlu
This study examined prospective classroom teachers’ perceptions of instructional technologies and the web-based digital tools they actively use. Using a case study design with semi-structured interviews, data were collected from 15 prospective teachers who had completed an instructional technology course. The findings show that participants strongly emphasized the necessity of technology integration in education. The most commonly used tools included assessment, visual–infographic design, coding, drawing–shaping, augmented and virtual reality, animation, interactive presentations, and artificial intelligence. These tools were found to significantly support effective and efficient learning, enhance motivation, and promote sustainable learning. Accordingly, the study recommends the systematic use of web-based digital tools to support digital transformation in education.
Volume: 14
Issue: 6
Page: 5219-5228
Publish at: 2025-12-01

Novel fractional order sinusoidal oscillators using operational trans resistance amplifier

10.12928/telkomnika.v23i6.27250
Battula; University College of Engineering Kakinada Tirumala Krishna , Vanitha; GITAM University Kakollu , Manchala; Jawaharlal Nehru Technological University Kakinada Madhusudhan Prasad
The design of fractional order circuits in very large-scale integration (VLSI) domain is gaining the interest of many researchers. At the same time design of fractional circuits using the current mode devices is attracting the research community. In this paper, several possible fractional order sinusoidal oscillators using operational trans resistance amplifier (OTRA) as a basic building block is presented. The necessary condition for the frequency of oscillation and condi tion for oscillations is derived. Fractional order operator sα is the most crucial one to be approximated. In this paper, the fractional order element is approxi mated by the continued fraction expansion (CFE). The approximation is carried out up to fifth order. The circuits are tested with the simulation software named LTspice. The results agree with the theoretical one. The proposed circuits of fers a frequency of 15 MHz, 20 MHz, and 25 MHz which is higher in value as compared to the existing circuits. The proposed circuits finds applications in bio medical, communication circuits.
Volume: 23
Issue: 6
Page: 1635-1645
Publish at: 2025-12-01

Business intelligence through data visualization: a case study using marketing campaign dataset

10.12928/telkomnika.v23i6.27166
Aditi; Chandigarh College of Engineering and Technology Bansal , Ankit; Chandigarh College of Engineering and Technology Gupta
In today’s competitive business environment, data-driven marketing strategies are essential for successful campaign outcomes. This study presents a comprehensive analysis of marketing campaign data, emphasizing its role in enhancing customer engagement, improving decision-making, and increasing conversion rates. It explores the complexity of campaign dynamics and consumer behavior, demonstrating how business intelligence and data visualization techniques support informed marketing decisions and actionable insights. Advanced data science methods such as data cleaning, feature engineering, and cross-validation enhance predictive accuracy and campaign optimization. Visualization plays a central role in transforming raw data into interpretable insights, enabling businesses to identify trends in customer preferences and purchasing behavior. Key findings reveal that customers aged 51–70, particularly those with higher education and income levels, show the greatest purchasing power, especially for wine and meat products. These insights help align marketing strategies with data-driven understanding to design personalized campaigns that resonate with target audiences. By combining analytical methods with effective visualization, businesses can develop impactful campaigns that drive engagement, boost conversions, and foster revenue growth. The study concludes with directions for future research, including real-time data processing and automated decision-making systems to ensure continuous improvement in digital marketing strategies.
Volume: 23
Issue: 6
Page: 1466-1475
Publish at: 2025-12-01

Lightning studies on effects on distribution lines: a bibliometric analysis

10.12928/telkomnika.v23i6.26976
Vladimir; Universidad Católica de Manizales Henao - Céspedes , Luis Fernando; Universidad Nacional de Colombia Sede Manizales Díaz - Cadavid
The study of lightning effects on distribution lines is of vital importance for the reliability and safety of electrical systems, as lightning is one of the main causes of failures. The purpose of this study is to perform a bibliometric analysis to evaluate academic productivity trends and research trajectories in this field. The methodology was based on a comprehensive search of the Scopus database, from which a total of 545 articles published between 1932 and 2024 were analyzed. For the analysis, the VOSviewer tool and the Bibliometrix library in R were used. The results reveal a constant increase in productivity since the 1970s, with Japan and China emerging as the most prolific countries. The research has evolved from early theoretical and experimental studies toward the use of advanced computational models and, more recently, the application of machine learning techniques for fault detection. In conclusion, the findings of this study provide a consolidated view of the field, which is fundamental for engineers to be able to design more robust protection systems and to guide future research toward model validation and the integration of renewable energy technologies.
Volume: 23
Issue: 6
Page: 1687-1695
Publish at: 2025-12-01

Object detection and tracking with decoupled DeepSORT based on αβ filter

10.12928/telkomnika.v23i6.27500
Lakhdar; University of Sciences and Technology of Oran (USTO-MB) Djelloul Mazouz , Abdessamad; University of Sciences and Technology of Oran (USTO-MB) Kaddour Trea , Tarek; University of Sciences and Technology of Oran (USTO-MB) Amiour , Abdelaziz; University of Sciences and Technology of Oran (USTO-MB) Ouamri
With the rapid growth of the population, the demand for autonomous video surveillance systems has substantially increased. Recently, artificial intelligence has played a key role in the development of these systems. In this paper, we present an enhanced autonomous system for object detection and tracking in video streams, tailored for transportation and video surveillance applications. The system comprises two main stages: detection stage; this stage employs you only look once (YOLO)v8m, trained on the KITTI dataset, and is configured to detect only pedestrians and cars. The model achieves an average precision of 97.3% and 87.1% for cars and pedestrians classes respectively, resulting a final mean average precision (mAP) of 92.2%. Tracking stage; the tracking component utilizes the DeepSORT algorithm, which originally incorporates a Kalman filter for motion prediction and performs data association using cosine and Mahalanobis distances to maintain consistent object identifiers across frames. To improve tracking performance, we introduce two key modifications to the original DeepSORT: architecture modification and Kalman filter replacement. The tracking tests are carried out on KITTI and MOTChallenge Benchmarks. The final order tracking accuracy (HOTA) scores achieve 77.645 and 54.019 for Cars and Pedestrians classes respectively in the KITTI-Benchmark and 45.436 for the Pedestrians class in the MOTChallenge-Benchmark.
Volume: 23
Issue: 6
Page: 1729-1742
Publish at: 2025-12-01

Machine learning-based energy management system for electric vehicles with BLDC motor integration

10.11591/ijpeds.v16.i4.pp2400-2410
K. S. R. Vara Prasad , V. Usha Reddy
This paper proposes a machine learning-based energy management system for electric vehicles with BLDC motor integration. Efficient energy management is essential for improving the performance, range, and reliability of electric vehicles (EVs), particularly those powered by brushless DC (BLDC) motors. Traditional energy management systems (EMS), such as rule-based and fuzzy logic controllers, often lack the adaptability required for dynamic driving conditions and optimal energy distribution. This paper presents a machine learning (ML)-based EMS framework tailored for EVs equipped with BLDC motors, aiming to enhance system responsiveness and energy efficiency. ML algorithms, including decision trees, random forests, support vector machines (SVMs), and XGBoost, are trained on diverse datasets that reflect varying load demands, driving cycles, and battery state-of-charge (SOC) levels. The proposed EMS is modeled and validated in Python programming to simulate realistic EV operating scenarios. Simulation results indicate that the ML-based EMS outperforms conventional methods by achieving up to 15% energy savings, reducing battery stress, and maintaining smoother SOC transitions. These findings highlight the potential of ML-driven strategies for creating adaptive, intelligent EMS solutions in next-generation BLDC motor-based EVs.
Volume: 16
Issue: 4
Page: 2400-2410
Publish at: 2025-12-01

Approach to self-synchronization of a group of static power converters

10.11591/ijpeds.v16.i4.pp2342-2352
Victor Lavrinovsky , Nikita Dobroskok , Valery Bulychev , Ruslan Migranov , Yuriy Yu Perevalov , Anastasia Stotckaia
This study examines the control and synchronization of an orderly connected network of three-phase bidirectional power converters, serving as the grid interface for an energy storage system. The primary objective is to ensure stable operation under single-phase and non-symmetrical three-phase grid conditions. The control employs independent phase voltage regulation for compatibility. To achieve seamless coordination of an unlimited group of converters, the paper proposes a synchronization method based on a modified Kuramoto model. This method is designed to be compatible with independent phase control during asymmetric grid states. The proposed approach utilizes a structured connection graph, defined by phase shift magnitude, to synchronize the converter group. A brief overview of the tools for synchronizing oscillator groups is provided. A computer model was developed to study the operating modes of this converter class under both symmetrical and asymmetrical loads. Simulation studies confirmed the viability of the synchronization method. Furthermore, the research results were successfully applied in the design and implementation of a physical 10 kW grid - connected uninterruptible power supply prototype, demonstrating practical feasibility.
Volume: 16
Issue: 4
Page: 2342-2352
Publish at: 2025-12-01

Effect of the angular offset of the stator windings on DSIM performance

10.11591/ijpeds.v16.i4.pp2234-2242
Fatma Lounnas , Salah Haddad
The study outlined in this paper aims to analyze the effect of the different displacement angles between the two stator windings on the performance of a dual stator induction motor, which is a squirrel cage induction motor with two identical windings in its stator. The rated power of each winding is 1.1 kW and fed by an inverter operating with the pulse width modulation technique. The analytical model of the machine is used to analyze its characteristics to investigate the impact of the displacement angles between the two stator windings. A simulation program for the system has been developed using MATLAB/Simulink. Simulation results characterizing the comportment of this machine for different displacement angles of the stator windings show that the torque pulsations are noticeably lower at 30° shift than in the other two scenarios of 0° and 60°, the model exhibits noteworthy performances at this shift. The torque pulsations are noticeably lower at 30° shift than in the other two scenarios of 0° and 60°, and the model exhibits noteworthy performance at this shift. In this case, there are also reduced rotor current ripples, which decrease rotor heating. Despite this, the harmonics increased the peak stator phase currents for a 30° electrical offset.
Volume: 16
Issue: 4
Page: 2234-2242
Publish at: 2025-12-01
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