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International Conference on Software, Telecommunications and computer Networks (SoftCOM)

作者： David Dumančić David Mijić Mario Vranješ Ratko Grbić TTTechAuto d.o.o. Cara Hadrijana 10b Osijek Croatia Faculty of Electrical Engineering Computer Science and Information Technology Osijek Osijek Croatia

The development of autonomous driving (AD) algorithms and their testing would be very expensive when real-world vehicles and environments would be used from the very beginning of development. That is why in the initial development phases simulators are often used, in which it is possible to achieve realistic simulations of the real world. Therefore, many different simulators for AD have been developed. One of the main tasks of a fully autonomous vehicle is steering angle prediction (SAP). This paper explores SAP using a PilotNet CNN-based algorithm that recognizes essential features from input images to predict vehicle trajectory. After training on real-world images, the algorithm’s performance is evaluated in both CARLA and AirSim simulators, achieving 91.65% autonomy in CARLA and 71.87% in AirSim. The algorithm is further trained on the images obtained from the simulator, resulting in improved performance of 96.34% in CARLA and 78.99% in AirSim in terms of total autonomy. The study demonstrates the benefits of simulators for the development of AD algorithms and highlights the importance of testing in multiple simulators to achieve reliable performance across different environments and scenarios, including different lighting and weather conditions, types of road markings, and track configurations. The paper also highlights the advantages and disadvantages of individual simulators, which can be useful for the development and testing of future SAP algorithms.

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Investigation on continual training of computer-aided diagnosis systems by semi-supervised learning 2022

Investigation on continual training of computer-aided diagno...

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4th International Conference on Intelligent Medicine and Image Processing, IMIP 2022

作者： Muramamatsu, Chisako Nishio, Mizuho Oiwa, Mikinao Yakami, Masahiro Kubo, Takeshi Fujita, Hiroshi Faculty of Data Science Shiga University Japan Department of Radiology Kobe University Hospital Japan Department of Radiology Nagoya Medical Center Japan Preemptive Medicine and Lifestyle-Related Disease Research Center Kyoto University Hospital Japan Department of Radiology Tenri Hospital Japan Department of Electrical Electronic and Computer Engineering Faculty of Engineering Gifu University Japan

ISBN: (纸本)9781450396202

Medical image analysis systems can help radiologists in reading images accurately and promptly. The systems are expected to be robust to images obtained with any imaging systems by different vendors and at different facilities. However, because of the prevalence of diseases and difficulty of collecting samples with various characteristics, the systems may not apply well to all the images. Artificial intelligence-powered systems are expected to learn from experience and be improved continuously. In this study, we investigated whether continual training with local samples can improve system performance using mammography and lung CT databases. Different training strategies using unlabeled data are compared. © 2022 ACM.

关键词： computer aided diagnosis

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An Image Processing Approach for Fatigue Crack Identification in Cellulose Acetate Replicas

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SSRN 2024年

作者： Skibicki, Dariusz Palczyński, Krzysztof Seyda, Jan Pejkowski, Lukasz Macek, Wojciech Faculty of Telecommunications Computer Science and Electrical Engineering Bydgoszcz University of Science and Technology Al. Prof. S. Kaliskiego 7 Bydgoszcz85-796 Poland Faculty of Mechanical Engineering Bydgoszcz University of Science and Technology Al. Prof. S. Kaliskiego 7 Bydgoszcz85-796 Poland Faculty of Mechanical Engineering and Ship Technology Gdańsk University of Technology Narutowicza 11/12 Gdańsk80-233 Poland

The cellulose acetate replication technique is an important method for studying material fatigue. However, extracting accurate information from pictures of cellulose replicas poses challenges because of distortions and numerous artifacts. This paper presents an image processing procedure for effective fatigue crack identification in plastic replicas. The approach employs thresholding, adaptive Gaussian thresholding, and Otsu binarization to convert gray-scale images into binary ones, enhancing crack visibility. Morphological operations refine object shapes, and Connected Components Analysis facilitates crack identification. Despite limited data, the handcrafted feature extraction algorithm proves robust, addressing challenges. The algorithm shows efficacy in detecting cracks as small as 30 μm, even in the presence of cellulose replication artifacts. The results highlight ability to capture significant cracks’ orientation, length, and growth stages, essential for understanding fatigue mechanisms. Analysis of results, especially evaluation metrics encompassing false positives and false negatives, provides a comprehensive understanding of the algorithm’s strengths and limitations. The proposed tool is available on GitHub. © 2024, The Authors. All rights reserved.

关键词： Cellulose

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Phase Optimization and Relay Selection for Joint Relay and IRS-Assisted Communication

Phase Optimization and Relay Selection for Joint Relay and I...

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IEEE Conference on Vehicular Technology (VTC)

作者： Uyoata E. Uyoata Mobayode Akinsolu Enoruwa Obayiuwana Abimbola Sangodoyin Ramoni Adeogun Wireless Communication Network Section Aalborg University Aalborg Denmark Faculty of Arts Computing and Engineering Wrexham University Wrexham UK Department of Electronic and Electrical Engineering Obafemi Awolowo University Ife Nigeria School of Computer Science University of Lincoln Lincoln

ISBN: (数字)9798331517786

ISBN: (纸本)9798331517793

The use of Intelligent Reflecting Surfaces (IRSs) is considered a potential enabling technology for enhancing the spectral and energy efficiency of beyond 5G communication systems. In this paper, a joint relay and intelligent reflecting surface (IRS)-assisted communication is considered to investigate the gains of optimizing both the phase angles and selection of relays. The combination of successive refinement and reinforcement learning is proposed. Successive refinement algorithm is used for phase optimization and reinforcement learning is used for relay selection. Experimental results indicate that the proposed approach offers improved achievable rate performance and scales better with number of relays compared to considered benchmark approaches.

关键词： Vehicular and wireless technologies Communication systems 5G mobile communication Simulation Diversity reception Reinforcement learning Benchmark testing Energy efficiency Relays Optimization

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Post DC Fault Circulating Current Suppression Control

Post DC Fault Circulating Current Suppression Control

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IEEE General Meeting Power& Energy Society

作者： Rohan Kamat Tarcar Ajay Shetgaonkar Marjan Popov Mart van der Meijden Wilhelm Winter Mario Ndreko Robert Dimitrovski Matthias Burkhardt Aleksandra Lekić Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft The Netherlands TenneT TSO B.V. Arhnem The Netherlands TenneT GmbH Bayreuth Germany

The radial topology of the Multi-terminal High Voltage Direct Current (MTDC) power system is a preferred connection for the gigawatt- renewable power due to its scalability and reliability. However, a radial topology with a metallic return bipolar converter configuration MTDC network possesses technical challenges regarding DC fault current interruption and grid expansion. Furthermore, such HVDC networks are energized in a specific manner, usually involving a separate energizing controller. This paper proposes a design of DC Hubs with direct current circuit breakers (DCCBs) along with a network energization sequence without requiring a separate controller. Additionally, a PI-based controller for post-DC fault circulating current in MTDC’s metallic return is proposed. This control operates after DCCB recloses, removing any offset in the metallic cable by regulating the power setpoint in the converters. The proposed control is investigated under a pole-to-ground fault occurrence in the DC Hub. The proposed solution is validated by RSCAD/RTDS @ simulation by applying detailed and average equivalent models of turbines, DCCBs and converters. The results of this simulation show a successful suppression of the DC circulating current, which results in a balanced operation of the MMCs in the post fault steady state conditions.

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Generalized Hat Functions for Fractional Delay Optimal Control Problems With ψ-Caputo Fractional Derivative

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Mathematical Methods in the Applied sciences 2025年

作者： Karami, S. Heydari, M.H. Baleanu, D. Shasadeghi, M. Department of Mathematics Shiraz University of Technology Shiraz Iran Department of Computer Science and Mathematics Lebanese American University Beirut Lebanon Electrical Engineering Faculty Shiraz University of Technology Shiraz Iran

The primary focus of this study is to examine delay optimization problems, subject to a dynamical system that involves (Formula presented.) -Caputo fractional derivative. The generalized hat functions are applied to develop a computational technique for addressing such problems. To achieve this, a new matrix for the (Formula presented.) -Riemann–Liouville fractional integral of the generalized hat functions is derived. The proposed approach utilizes the generalized hat functions to approximate the control and state variables, successfully converting the solution of the primary problem into a set of algebraic equations. The established algorithm is a straightforward and effective mathematical technique for numerically solving this family of problems. Finally, several examples are examined to validate the accuracy and applicability of the proposed approach. © 2025 John Wiley & Sons Ltd.

关键词： delay optimal control problem generalized hat functions operational matrix of ψ-Riemann–Liouville fractional integral ψ-Caputo fractional derivative

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Enhanced Beam Controllability ⨉ Butler Matrix with Digital Phase Shifters

Enhanced Beam Controllability ⨉ Butler Matrix with Digital ...

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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Hao Wan Jin Xu Lei Zhu School of Electronics and Information Northwestern Polytechnical University Xi’an P.R. China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macau China

In this paper, a new method for designing a reconfigurable $4 \times 4$ Butler matrix is proposed with digital phase shifters (PSs). The equation for the relationship between digital PSs and phase differences (PD) of the sequenced ports is derived and discussed. With these derived equations, more PDs can be achieved by changing the value of the PSs. The design concept is demonstrated by a Butler Matrix composed of 4 transformer-based couplers and 4 PSs based on open-/short-circuit microstrip line-loaded slotline, which produce total of 16 PDs with compact size approximately to 4th order Butler matrix.

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Performance Evaluation of Multi-Gb/s Sub-6 GHz Signals over Bidirectional Microwave Photonic Links for Urban and Rural Areas

Performance Evaluation of Multi-Gb/s Sub-6 GHz Signals over ...

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International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： Jan Bohata Dong-Nhat Nguyen Luis Vallejo Beatriz Ortega José Mora Stanislav Zvánovec Faculty of electrical engineering Czech Technical University in Prague Prague Czech Republic TNO Delft Netherland School of Computer Science and Electronic Engineering Bangor University Bangor United Kingdom Universitat Politè cnica de València Valencia Spain

ISBN: (数字)9798350348743

ISBN: (纸本)9798350348750

We propose and experimentally demonstrate a full-duplex fiber-space-fiber system in the 5G sub-6 GHz frequency bands for simultaneous transmission of multi-Gb/s downlink and uplink signals. In the downlink direction, transmission of a 2.4-Gb/s 64-quadrature amplitude modulation (64-QAM) signal at 5-GHz over a seamless optical link of 10-km standard single-mode fiber (SSMF), 1.2-m free-space optics (FSO) and 1.4-km SSMF with error-vector magnitude (EVM) lower than 4% is achieved by using external modulation. In the uplink direction, a directly modulated laser is employed to transmit 2-Gb/s 4-QAM signal at 3.5-GHz over the same hybrid channel with the measured EVM below 11% and thus value satisfying the 3GPP limit. The proposed system provides a practical solution for extension or recovery of broadband wireless connectivity.

关键词： Wireless communication Optical fibers 5G mobile communication Optical recording Optical fiber networks Microwave communication Optical fiber communication

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A systematic review and meta-data analysis of clinical data repositories in Africa and beyond: recent development, challenges, and future directions

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Discover Data 2024年第1期2卷 1-39页

作者： Adewole, Kayode S. Alozie, Emmanuel Olagunju, Hawau Faruk, Nasir Aliyu, Ruqayyah Yusuf Imoize, Agbotiname Lucky Abdulkarim, Abubakar Imam-Fulani, Yusuf Olayinka Garba, Salisu Baba, Bashir Abdullahi Hussaini, Mustapha Oloyede, Abdulkarim A. Abdullahi, Aminu Kanya, Rislan Abdulazeez Usman, Dahiru Jafaru Department of Computer Science University of Ilorin Ilorin Nigeria Department of Information Technology Sule Lamido University Kafin Hausa Nigeria Department Information and Media Studies Faculty of Communication Bayero University Kano Nigeria Department of Electrical and Electronics Engineering Faculty of Engineering University of Lagos Lagos Nigeria Department of Electrical Engineering Ahmadu Bello University Zaria Nigeria Department of Electrical and Telecommunications Engineering Kampala International University Kampala Uganda Department of Telecommunication Science University of Ilorin Ilorin Nigeria Department of Software Engineering Sule Lamido University Kafin Hausa Kafin Hausa Nigeria Department of Cyber Security Sule Lamido University Kafin Hausa Kafin Hausa Nigeria Department of Economics Faculty of Social and Management Sciences Kafin Hausa Nigeria Department: University Medical Services Sule Lamido University Kafin Hausa Kafin Hausa Nigeria Department of Computer Science and Information Technology Baze University Abuja Nigeria Department: International Law and Jurisprudence Faculty of Law Bayero University Kano Nigeria

A Clinical Data Repository (CDR) is a dynamic database capable of real-time updates with patients' data, organized to facilitate rapid and easy retrieval. CDRs offer numerous benefits, ranging from preserving patients' medical records for follow-up care and prescriptions to enabling the development of intelligent models that can predict, and potentially mitigate serious health conditions. While several research works have attempted to provide state-of-the-art reviews on CDR design and implementation, reviews from 2013 to 2023 cover CDR regulations, guidelines, standards, and challenges in CDR implementation without providing a holistic overview of CDRs. Additionally, these reviews need to adequately address critical aspects of CDR; development and utilization, CDR architecture and metadata, CDR management tools, CDR security, use cases, and artificial intelligence (AI) in CDR design and implementation. The collective knowledge gaps in these works underscore the imperative for a comprehensive overview of the diverse spectrum of CDR as presented in the current study. Existing reviews conducted over the past decade, from 2013 to 2023 have yet to comprehensively cover the critical aspects of CDR development, which are essential for uncovering trends and potential future research directions in Africa and beyond. These aspects include architecture and metadata, security and privacy concerns, tools employed, and more. To bridge this gap, in particular, this study conducts a comprehensive systematic review of CDR, considering critical facets such as architecture and metadata, security and privacy issues, regulations guiding development, practical use cases, tools employed, the role of AI and machine learning (ML) in CDR development, existing CDRs, and challenges faced during CDR development and deployment in Africa and beyond. Specifically, the study extracts valuable discussions and analyses of the different aspects of CDR. Key findings revealed that most architectural mod

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Enhancing Power Grid Stability: Design and Integration of a Fast Bus Tripping System in Protection Relays

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IEEE Transactions on Consumer Electronics 2024年

作者： Ghiasi, Mohammad Wang, Zhanle Mehrandezh, Mehran Alhelou, Hassan Haes Ghadimi, Noradin University of Regina Faculty of Engineering and Applied Science ReginaSKS4S 0A2 Canada School of Engineering CambridgeMA United States Monash University Department of Electrical and Computer System Engineering Australia Islamic Azad University Young Researchers and Elite Club Ardabil Branch Ardabil Iran

This article introduces a novel method for efficiently and promptly operating protection relays within a power system, with a specific emphasis on adaptive overcurrent (OC) protection in a power grid. The approach utilizes SEL751 and SEL751A relays that communicate through the IEC-61850 GOOSE protocol, establishing connections using intelligent electronic devices (IED) at several locations in the system. The power system, consisting of transformers, bus bars, and feeders, employs protection relays to identify OC faults based on time and current parameters. Relay configurations are tested in a case study at the Omicron Lab involving a 138/25kV substation. The test encompasses various fault scenarios on the low-voltage (LV) and high-voltage (HV) sides, incorporating different current values and fault times, utilizing the chosen time-overcurrent U3 (very inverse) curve. The proposed approach exhibits the ability to promptly remove faults in transformers and substations at both the HV and the LV levels. Furthermore, the experimental results closely match the theoretical calculations, validating the effectiveness of the proposed approach in the protection of AC grids. Additionally, built-in cybersecurity measures in SEL relays ensure secure and reliable operation, mitigating the risks of cyber-related relay failures. © 1975-2011 IEEE.

关键词： Relay protection

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