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Workshop on Smart Grid and Renewable Energy (SGRE)

作者： Naki Guler Farzaneh Bagheri Hasan Komurcugil Sertac Bayhan Electrical and Electronic Engineering Technology Faculty Gazi University Ankara Turkey Department of Electrical and Electronic Engineering Antalya Bilim University Antalya Turkey Department of Computer Engineering Eastern Mediterranean University Famagusta Turkey Qatar Environment and Energy Research Institute Doha Qatar

This paper proposes a single-phase bidirectional battery charger which comprises a three-level F-type converter and a bidirectional dc-dc converter. The proposed charger is suitable for electric vehicles and battery energy storage systems. The bidirectional dc-dc converter is integrated into the system to prevent the charge current oscillations caused by double-line frequency voltage ripples of the F-type converter when operates as a single-phase rectifier. The F-type converter operates as rectifier and inverter during charging and discharging modes, respectively. The power flow of the battery is controlled with a bidirectional dc-dc converter. The current control of both F-type and bidirectional dc-dc converters is achieved by the model predictive control (MPC) method. The control strategy is designed by considering the power balance theory. For this purpose, the voltage of the common connection point of both converters (dc-link) is regulated. The grid current reference of the F-type converter is obtained by using a proportional-integral (PI) controller whose input is the dc-link voltage error. Thus, bidirectional power flow control is achieved. The effectiveness of the proposed power converter structure as well as the control strategy is investigated by simulation studies performed on MATLAB/Simulink environments. The results show that the proposed system is capable of controlling the grid and battery currents in both power directions.

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Design of Miniaturized Metamaterial Reflector with Doubly Interdigital Structure for 5G Use Cases

Design of Miniaturized Metamaterial Reflector with Doubly In...

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13th International Electrical engineering Congress, iEECON 2025

作者： Somwong, Tanee Chomtong, Pongsathorn Khamsuthat, Jirayut Chudpooti, Nonchanutt Akkaraekthalin, Prayoot Rajamangala University of Technology Suvarnabhumi Faculty of Engineering and Architecture Department of Electronic and Telecommunications Engineering Nonthaburi Thailand King Mongkut's University of Technology North Bangkok Faculty of Technical Education Department of Teacher Training in Electrical Engineering Bangkok Thailand King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Industrial Physics and Medical Instrumentation Bangkok Thailand King Mongkut's University of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering Bangkok Thailand

ISBN: (纸本)9798331543952

This paper presents the design of a miniaturized metamaterial reflector composing of an open-loop transmission line unit cell structure. The transmission line ends are connected by using a double interdigital technique, resulting in a large capacitive value compared to the conventional methods. When combined with the open-loop line employing the trisection step-impedance structure with adjusting of the capacitive value, its second and third resonant frequencies will be controllable. As a result, this approach can reduce the unit cell size from a typical value of λ/2 to an approximate value of λ/16, therefore overall size of the reflector is significantly decreased. The designed unit cell is measured to be 1.05 cm × 1.0 cm. We implemented the proposed reflector on an FR-4 PCB with a relative permittivity of about 4.4, a substrate height (h) of 1.6 mm, and a loss tangent of about 0.02. The operating frequency range targets of 5G use cases were set to be at 1.8 GHz, 2.6 GHz and 3.5 GHz, respectively. When used with a dipole antenna, the bandwidths of 390 MHz, 604 MHz, and 1.1 GHz and the antenna gains of about 8.23 dB, 8.14 dB, and 8.19 dB were obtained at the operating frequencies, respectively. © 2025 IEEE.

关键词： Antenna reflectors

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Azimuthally and radially polarized beams generated in a helical fiber grating 22

Azimuthally and radially polarized beams generated in a heli...

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Optical Components and Materials XXII 2025

作者： Meng, Zhang Wang, Peng Zhao, Hua Li, Hongpu Graduate School of Science and Technology Shizuoka University Johoku 3-5-1 Chuo-Ku Hamamatsu 432-8561 Japan School of the Electronic Engineering Nanjing Xiaozhuang University Nanjing 211171 China School of the Computer and Electronic Information Nanjing Normal University Nanjing 210023 China Faculty of the Engineering Shizuoka University Johoku 3-5-1 Chuo-Ku Hamamatsu 432-8561 Japan

ISBN: (纸本)9781510684720

Azimuthally polarized (AP) and radially polarized (RP) beams are the two common types of cylindrical vector beam that has a spatially varying polarization distribution. In this study, an efficient method allowing the flexible generation of the azimuthally and radially polarized beams has been proposed and experimentally demonstrated, which is realized by using a helical fiber grating with an intermediate-period (HFG). To the best of our knowledge, this is the first time that such two kinds of cylindrical vector beams can be flexibly generated by using only one fiber component, i.e., the HFG. The proposed method provides the potential application of the HFG to not only the laser processing but also the optical tweezer, and the optical manipulator as well. © 2025 SPIE.

关键词： Azimuthally polarized beam cylindrical vector modes helical fiber grating radially polarized beam

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Design of Miniaturized Metamaterial Reflector with Doubly Interdigital Structure for 5G Use Cases

Design of Miniaturized Metamaterial Reflector with Doubly In...

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International Electrical engineering Congress (iEECON)

作者： Tanee Somwong Pongsathorn Chomtong Jirayut Khamsuthat Nonchanutt Chudpooti Prayoot Akkaraekthalin Department of Electronic and Telecommunications Engineering Faculty of Engineering and Architecture Rajamangala University of Technology Suvarnabhumi Nonthaburi Thailand Department of Teacher Training in Electrical Engineering Faculty of Technical Education King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9798331543952

ISBN: (纸本)9798331543969

关键词： Wireless communication 5G mobile communication Dipole antennas Simulation Resonant frequency Reflector antennas Transmission line measurements Metamaterials Gain Substrates

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Explainable Deep Learning Model for Cardiac Arrhythmia Classification

Explainable Deep Learning Model for Cardiac Arrhythmia Class...

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2022 International Conference on Future Trends in Smart Communities, ICFTSC 2022

作者： Abdullah, Talal A.A. Zahid, Mohd Soperi Bin Mohd Tang, Tong Boon Ali, Waleed Nasser, Maged Computer & Information Sciences Universiti Teknologi PETRONAS Perak Malaysia Electrical & Electronic Engineering Universiti Teknologi PETRONAS Perak Malaysia King Abdulaziz University Faculty of Computing and Information Technology Information Technology Department Perak Malaysia School of Computer Sciences Universiti Sains Malaysia Penang Malaysia

ISBN: (纸本)9798350334548

In this work, we proposed a hybrid deep learning model that (CNN-GRU) combines a One-Dimensional Neural Network (1D CNN) and a Gated Recurrent Unit (GRU) to classify four types of cardiac arrhythmia and applied LIME to provide explanations for its predictions. LIME is a well-known local explanation method that can explain any machine learning model by simulating its behaviours to generate explanations. However, LIME can only explain tabular, text, and image datasets. Therefore, we proposed a visual presentation of LIME on signal dataset by applying a heatmap to highlight important areas on the heartbeat signals. Moreover, we propose an effective method to segment heartbeats from ECG records, ensuring that all key features are extracted correctly, such as QRS Complex, P Wave, and T Wave. The proposed hybrid model was trained using ECG lead II from the MIT-BIH dataset and evaluated based on accuracy, precision, recall, f1 score, and AUC-ROC performance matrix. To highlight the proposed model's validity, we compare it against the standalone CNN and GRU models and prove its superiority in terms of accuracy and ROC. © 2022 IEEE.

关键词： Electrocardiograms

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A T-Type converter-based Electric Vehicle Charger with Active Power Filter Functionality 48

A T-Type converter-based Electric Vehicle Charger with Activ...

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48th Annual Conference of the IEEE Industrial electronics Society, IECON 2022

作者： Bayhan, Sertac Komurcugil, Hasan Hamad Bin Khalifa University Qatar Environment and Energy Research Institute Doha Qatar Gazi University Technology Faculty Department of Electrical-Electronic Engineering Ankara06500 Turkey Eastern Mediterranean University Department of Computer Engineering Famagusta Turkey

ISBN: (数字)9781665480253

ISBN: (纸本)9781665480253

An electric vehicle (EV) charging infrastructure is a backbone in electrifying the transport sector and can offer a wide range of functionalities to the utility grid if equipped with the right hardware and software. This study presents a T-type converter-based EV charger with active power filter (APF) functionality. The considered power topology in this study consists of a three-phase T-type converter (AC/DC power stage) and a dual active bridge converter (DC/DC power stage), which regulates the power flow between the grid and EV battery. The presented hybrid control algorithm allows the EV charger to operate either in EV charger mode or APF mode. A simulation model is developed in PSIM environment and the performance of the proposed control algorithm is tested in charging mode and APF mode. © 2022 IEEE.

关键词： Charging (batteries)

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A Square Patch Partially Reflective Surface for Improving the Antenna Gain Characteristic of Low-Cost Dual Polarized Microstrip Antenna

A Square Patch Partially Reflective Surface for Improving th...

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2022 Research, Invention, and Innovation Congress: Innovative Electricals and electronics, RI2C 2022

作者： Chudpooti, Sukanya Sangpet, Patchadaporn Chudpooti, Nonchanutt Sathitanon, Nontakorn Somjit, Nutapong Akkaraekthalin, Prayoot King Mongkut's University of Technology North Bangkok Facutly of Appied Science Department of Industrial Physics and Medical Instrumentation Bangkok Thailand Faculty of Engineering King Mongkut's University of Technology North Bangkok Department of Electrical and Computer Engineering Bangkok Thailand King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Computer and Information Sciences Bangkok Thailand University of Leeds School of Electronic and Electrical Engineering Leeds United Kingdom

ISBN: (数字)9781665473248

ISBN: (纸本)9781665473248

This paper presents an improvement gain of a dual-polarized microstrip patch antenna by using the partially reflective surface (PRS). The PRS is designed from a 10 × 10 array patches structure, which is patterned on a 0.8-mm FR-4 substrate. A-dual-port fed by two SMA connectors, which is selected to use as the source of an experiment. The square metallic patch is used to design the PRS layer. The dimension of the square patch is 5 mm × 5 mm. The length of the square patch is varied from 3.0mm to 4.5 mm by step of 0.5 mm to investigate the reflection coefficients, e.g., magnitude response and phase response. Based on the simulated results, a 4.5-mm square patch provides the highest reflection coefficient of 0.53. To prove the design concept, the size of a square patch of 4.5 mm is selected to fabricate and measure the radiation pattern. At an operating frequency of 3.5 GHz, the maximum gain at the zero degrees is increased from 1.2 dBi to 4.96 dBi when compared without and with PRS. © 2022 IEEE.

关键词： Reflection

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Design of an electronically Controlled Biquadratic Filter Using Commercial ICs

Design of an Electronically Controlled Biquadratic Filter Us...

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13th International Electrical engineering Congress, iEECON 2025

作者： Ritnathikul, Somkid Duangmalai, Danupat Kaewdang, Khanittha Kwuanphet, Settasuk Chalermpong, Thanawat Pitaksuttayaprot, Koson Phetchabun Rajabhat University Faculty of Agricultural and IndustrialTechnology Department of Computer Engineering Phetchabun6700 Thailand Ubon Ratchathani University Faculty of Engineering Department of Electrical and Electronic Engineering Ubon Ratchathani34190 Thailand Nakhon Phanom University Faculty of Industrial Technology Department of Electrical Engineering Nakhon Phanom48000 Thailand Phetchabun Rajabhat University Faculty of Agricultural and Industrial Technology Department of Electronics and Automation Systems Engineering Phetchabun6700 Thailand

ISBN: (纸本)9798331543952

This paper presents an electronically controlled biquadratic filter designed for precise frequency selection in applications such as audio processing, telecommunications, and cochlear implants. The design utilizes AD830, AD844, and LM13700 integrated circuits, facilitating high-pass, band-pass, and low-pass responses with improved stability and real-time tunability. PSPICE simulations validate the filter's adaptability and performance, demonstrating its effectiveness in dynamic environments and its suitability for high-frequency applications requiring flexible frequency control. The results indicate a calculated pole frequency of 2.23 MHz, while simulations yield a slightly lower value of 2.0 MHz, affirming the design's practical viability and alignment with theoretical expectations. © 2025 IEEE.

关键词： LSI circuits

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A novel fault-tolerant scheduling approach for collaborative workflows in an edge-IoT environment

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Digital Communications and Networks 2022年第6期8卷 911-922页

作者： Tingyan Long Yong Ma Lei Wu Yunni Xia Ning Jiang Jianqi Li Xiaodong Fu Xiangmi You Bo Zhang College of Computer Science Chongqing UniversityChongqing400030China School of Computer and Information Engineering Jiangxi Normal UniversityJiangxi330022China School of Mathematical Sciences University of Electronic Science and Technology of ChinaChengdu611731China Mashang Consumer Finance Co. Ltd.(MSCF)Chongqing401129China Global Energy Interconnection Research Institute Co.Ltd. Beijing102209China Faculty of Information Engineering and Automation Kunming University of Science and TechnologyYunnan650500China CISDI Research&Development CO. LTDChongqing401122China

As a newly emerging computing paradigm, edge computing shows great capability in supporting and boosting 5G and Internet-of-Things (IoT) oriented applications, e.g., scientific workflows with low-latency, elastic, and on-demand provisioning of computational resources. However, the geographically distributed IoT resources are usually interconnected with each other through unreliable communications and ever-changing contexts, which brings in strong heterogeneity, potential vulnerability, and instability of computing infrastructures at different levels. It thus remains a challenge to enforce high fault-tolerance of edge-IoT scientific computing task flows, especially when the supporting computing infrastructures are deployed in a collaborative, distributed, and dynamic environment that is prone to faults and failures. This work proposes a novel fault-tolerant scheduling approach for edge-IoT collaborative workflows. The proposed approach first conducts a dependency-based task allocation analysis, then leverages a Primary-Backup (PB) strategy for tolerating task failures that occur at edge nodes, and finally designs a deep Q-learning algorithm for identifying the near-optimal workflow task scheduling scheme. We conduct extensive simulative case studies on multiple randomly-generated workflow and real-world edge-IoT server position datasets. Results clearly suggest that our proposed method outperforms the state-of-the-art competitors in terms of task completion ratio, server active time, and resource utilization.

关键词： Edge computing Fault tolerance DQN algorithm Primary-backup model

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Robust Data Transmission Rate Allocation to Improve Energy Efficiency in 6G Networks

Robust Data Transmission Rate Allocation to Improve Energy E...

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2021 IEEE Globecom Workshops, GC Wkshps 2021

作者： Pourkabirian, Azadeh Anisi, Mohammad Hossein Islamic Azad University Faculty of Computer and Information Technology Engineering Qazvin Branch Qazvin Iran University of Essex School of Computer Science and Electronic Engineering Colchester United Kingdom

ISBN: (纸本)9781665423908

The future sixth-generation (6G) network is expected to support both sensing and communications. Since the sensing performance will highly rely on the residual battery of smart devices, energy efficiency is one of the main concerns in the design of 6G. Motivated by these facts, we design an energy efficient data transmission rate allocation approach for 6G networks. To have a more realistic deployment, we assume that perfect channel state information is not available. Imperfect channel state information (CSI) might waste energy sources or degrade quality of service (QoS). Thus, we apply the maximum likelihood estimation (MLE) method to estimate the true channel characteristics for a given set of observations. The proposed approach is robust against unknown channel statistics and allows adapting UEs transmission rate to the channel quality which reduce energy consumption and guarantees QoS. Both numerical analysis and simulation results confirm the effectiveness of the proposed work in terms of energy efficiency and throughput maximization. © 2021 IEEE.

关键词： Energy efficiency

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