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2nd International Microwave and Antenna Symposium, IMAS 2024

作者： Allah, H. Ataa Allah, F. Ataa Aznabet, M. Palacios, C. Akazzim, Y. El Mrabet, O. Jofre, M. Romeu, J. Jofre-Roca, L. University Abdelmalek Essaadi Intelligent System Design Laboratory Tetouan Morocco Universitat Politècnica de Catalunya Dept. Signal Theory and Communications Barcelona Spain Universitat Politècnica de Catalunya Dept. Network Engineering Barcelona Spain

ISBN: (纸本)9798350356359

This paper presents a study on a highly sensitive microwave sensor designed for the detection of a single yeast bioparticle. The sensor design integrates a planar microwave annular ring-gap resonator, coupled with a microfluidic channel for precise bioparticle manipulation. To optimize field confinement and maximize electric field strength, a small gap has been introduced into the resonator. This approach holds great potential for various applications. © 2024 IEEE.

关键词： Microwave sensors

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A Proposal of Fair Output Curtailment Method for Photovoltaic Generators and Wind Farms

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IEEJ Transactions on Power and Energy 2025年第1期145卷 21-31页

作者： Sugawara, Daichi Saitoh, Hiroumi Taguchi, Koyo Miyazaki, Yuichi Department of Electrical Engineering Tohoku University 6-6-05 Aramaki Aza-Aoba Aoba-ku Sendai980-8579 Japan Power System Eng. Dept. Tohoku Electric Power Network Co. Inc. 1-7-1 Honcho Aoba-ku Sendai980-8551 Japan

In an electric power system featuring an abundance of renewable energy sources (RES), such as photovoltaic generators (PVs) and wind farms (WFs), the need for curtailing RES output arises to maintain supply-demand balance during periods of anticipated excess generation across the electric power system. Ensuring equitable treatment among RES units regarding curtailment and minimizing overall curtailed energy become pivotal. This paper introduces a method to equitably establish upper output limits for each RES. The effectiveness of these methods is substantiated through numerical simulations. It was found that the key to achieving fairness is to uniformly improve the output control performance of RESs. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Mixed-integer linear programming

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Optimized Microwave Ring-Gap Resonator for Microchannel Particules State Monitoring

Optimized Microwave Ring-Gap Resonator for Microchannel Part...

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Microwave and Antenna Symposium (IMAS), International

作者： H. Ataa Allah F. Ataa Allah M. Aznabet C. Palacios Y. Akazzim O. EL Mrabet M. Jofre J. Romeu L Jofre-Roca Intelligent System Design Laboratory University Abdelmalek Essaadi Tetouan Morocco Dept. Signal Theory and Communications Universitat Politècnica de Catalunya Barcelona Spain Dept. Network Engineering Universitat Politècnica de Catalunya Barcelona Spain

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

关键词： Microwave antennas Sensitivity Transmitting antennas Microwave sensors Sensors Reliability Electric fields Microfluidics Monitoring Microchannels

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Application and Assessment of Click Modular Firewall vs POX Firewall in SDN/NFV Framework

Application and Assessment of Click Modular Firewall vs POX ...

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2020 IEEE Region 10 Conference, TENCON 2020

作者： Monir, Md Fahad Pan, Dan Independent University Dept. of Computer Science and Engineering Dhaka Bangladesh Telenor Sverige AB Dept. of Network Development System Stockholm Sweden

ISBN: (纸本)9781728184555

The evolution of Software Defined networks (SDN) and network Function Virtualization (NFV) introduced a revolutionary development in network architecture. SDN together with NFV provides users a platform to design flexible virtual networks (VNs) on a shared computer infrastructure. However, network administrators have specific requirements to secure this network. There are new security demands for VN such as flexible network function migrations and user-focused security system, which may not be supported by traditional firewalls. In our work we have implemented SDN and NFV based firewalls on an open source platform mininet. POX module and Click Modular Router are used to develop our firewall modules. Then we evaluated the performance of both firewalls with packet loss and throughput measurement. © 2020 IEEE.

关键词： network function virtualization

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A proposal of linear programming based method for achieving fair curtailment of wind power generation and conditions associated with the fair curtailment

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IEEJ Transactions on Power and Energy 2021年第7期141卷 506-519页

作者： Saitoh, Hiroumi Sugawara, Daichi Wayama, Wataru Sekinuma, Kazuhiro Department of Electrical Engineering Tohoku University 6-6-05 Aramaki Aza-Aoba Aoba-ku Sendai980-8579 Japan Power System Eng. Dept. Tohoku Electric Power Network Co. Inc. 1-7-1 Honcho Aoba-ku Sendai980-8551 Japan

If excess generation caused by increasing of photovoltaic and wind power generation plants is foreseen in a power system, the generation outputs of those plants are curtailed as a last resort in order to maintain the integrity of the power system. This paper proposes how the problem of minimizing curtailed excess wind power and allocating it fairly to all wind power generators can be formulated and solved with a linear programming method. Especially, necessary conditions for the minimum and fair allocation are identified mathematically. The validity of the LP based method has been checked with numerical computation of a simplified power system model. © 2021 The Institute of Electrical Engineers of Japan.

关键词： Linear programming

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Increasing Hosting Capacity of Uncontrollable Distributed Energy Resources in Isolated Power systems

Increasing Hosting Capacity of Uncontrollable Distributed En...

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Phivos Therapontos Andreas Stavrou Petros Aristidou Distribution System Operator Electricity Authority of Cyprus Nicosia Cyprus Department of Electrical and Computer Engineering University of Cyprus Nicosia Cyprus Transmission Network Owner Electricity Authority of Cyprus Nicosia Cyprus Dept. of Electrical & Computer Engineering & Informatics Cyprus University of Technology Limassol Cyprus

Due to the push for more sustainable generation, small-scale distributed energy resources (DERs) penetration has increased significantly. Most countries have no remote monitoring and control requirements for DERs below a certain size. Therefore, they can be labeled as uncontrollable DERs (UDERs). In isolated systems, the UDERs hosting capacity is limited due to frequency stability concerns, as it is impossible to modify or curtail their generation in a centralized manner. In this paper, we propose the utilization of the active power over-frequency reduction curve for increasing the hosting capacity of UDERs in isolated power systems. Cyprus’s power system has been used to evaluate the proposed solution’s performance. The optimal settings of the curve have been identified, and it was found that UDERs hosting capacity can be increased significantly with the proposed methodology.

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OFDM-Based Digital Semantic Communication with Importance Awareness

arXiv

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arXiv 2024年

作者： Liu, Chuanhong Guo, Caili Yang, Yang Ni, Wanli Quek, Tony Q.S. The Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China The Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China Department of Electronic Engineering Tsinghua University Beijing100084 China The Dept. of Information Systems Technology and Design Singapore University of Technology and Design 487372 Singapore

Semantic communication (SemCom) has received considerable attention for its ability to reduce data transmission size while maintaining task performance. However, existing works mainly focus on analog SemCom with simple channel models, which may limit its practical application. To reduce this gap, we propose an orthogonal frequency division multiplexing (OFDM)based SemCom system that is compatible with existing digital communication infrastructures. In the considered system, the extracted semantics is quantized by scalar quantizers, transformed into OFDM signal, and then transmitted over the frequency-selective channel. Moreover, we propose a semantic importance measurement method to build the relationship between target task and semantic features. Based on semantic importance, we formulate a sub-carrier and bit allocation problem to maximize communication performance. However, the optimization objective function cannot be accurately characterized using a mathematical expression due to the neural network-based semantic codec. Given the complex nature of the problem, we first propose a low-complexity sub-carrier allocation method that assigns sub-carriers with better channel conditions to more critical semantics. Then, we propose a deep reinforcement learning-based bit allocation algorithm with dynamic action space. Simulation results demonstrate that the proposed system achieves 9.7% and 28.7% performance gains compared to analog SemCom and conventional bit-based communication systems, respectively. Copyright © 2024, The Authors. All rights reserved.

关键词： Reinforcement learning

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A study on diagnostic analysis with precise decomposition for the decrepit automatic tensioning device

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Transactions of the Korean Institute of Electrical Engineers 2019年第5期68卷 696-700页

作者： Park, Byung-Gon Oh, Wan-Shik Seo, Ki-Bum Dept. of Railroad Electrical System Engineering Woosong University Korea Republic of Dept. of Korea Rail Network Authority Korea Railroad Electrical System Engineering Woosong University Korea Republic of Dept. of Korea Railway Electrification Technology Association Korea Republic of

- The contact wire used in the electric railways is expanded and contracted according to the as a function of temperature, and the tension on the contact wire would be changed due to the elastic expansion caused by aging and abrasion. In the case of outdoor temperature rising, the contact wire would be expanded, and the tension on the wire decreased, then sagging of the contact wire could be occurred. When the pantographs of the rolling stock come through the section of contact wire sagged, the contact wire could be broken consequently because of the incomplete contact and arc caused by vibration of the overhead, and expedited abrasion on the contact wire and pantograph. On the other way, the outdoor temperature dropping, the tension on the contact wire would be increased and the wire lifted up. Then it harms the equilibrium of the contact wire, and constant electricity collection of the pantograph. In this study a diagnostic analysis with precise decomposition for the decrepit wheel type automatic tensioning device(2 ton) accorded with the KRS-PW 0010-18(R) was carried out and tried to figure out the operation status of the device, and to identify the possibility of life time extension and the aging changes, so that the maintenance policy optimized for the tensioning device would be suggested through this study. Copyright © The Korean Institute of Electrical Engineers

关键词： Atmospheric temperature

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Explainable Semantic Communication for Text Tasks

arXiv

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arXiv 2023年

作者： Liu, Chuanhong Guo, Caili Yang, Yang Ni, Wanli Zhou, Yanquan Li, Lei Quek, Tony Q.S. The Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China The Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China Department of Electronic Engineering Tsinghua University Beijing100084 China School of Artificial Intelligence Beijing University of Posts and Telecommunications Beijing100876 China The Dept. of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore

Task-oriented semantic communication has gained increasing attention due to its ability to reduce the amount of transmitted data without sacrificing task performance. Although some prior efforts have been dedicated to developing semantic communications, the semantics in these works remains to be unexplainable. Challenges related to explainable semantic representation and knowledge-based semantic compression have yet to be explored. In this paper, we propose a triplet-based explainable semantic communication (TESC) scheme for representing text semantics efficiently. Specifically, we develop a semantic extraction method to convert text into triplets while using syntactic dependency analysis to enhance semantic completeness. Then, we design a semantic filtering method to further compress the duplicate and task-irrelevant triplets based on prior knowledge. The filtered triplets are encoded and transmitted to the receiver for completing intelligent tasks. Furthermore, we apply the propsed TESC scheme to two emblematic text tasks: sentiment analysis and question answering, in which the semantic codec is meticulously customized for each task. Experimental results demonstrate that 1) TESC scheme outperforms benchmarks in terms of Top-1 accuracy and transmission efficiency, and 2) TESC scheme enjoys about 150% performance gain compared to the traditional communication method. Copyright © 2023, The Authors. All rights reserved.

关键词： Semantics

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Analysis on the method of forward-reverse fault localization of electric railways for the improvement of accuracy

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Transactions of the Korean Institute of Electrical Engineers 2018年第12期67卷 1735-1742页

作者： Su-Kim, Myeong Cheol-Kim, Seong Dept. of Railroad Electrical System Engineering Woosong University Korea Republic of Dept. of Korea Rail Network Authority Korea Republic of

- The number of electric railway failures will increase due to the external and internal effects of electric railroads. The grounding test with 25,000V is to artificially test the transmission voltage to ground, and it is possible to cause risks of electric shock and other equipment insulation damage in neighboring enclosure. In 2016, method of fault localization changed to low - voltage at 380V from artificially high- voltage in the grounding tests since opening of Seoul Metropolitan Express Railway;The method is more accurate and safer rather than the previous one because it gets more data from unlimited grounding tests. However, an electric current falls on the track section where the track branches and vehicle bases with many lines. To precisely detect a transitive phenomenon, it is necessary to continuously study and additionally install. Copyright © The Korean Institute of Electrical Engineers.

关键词： Railroads

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