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12th International Renewable Energy Congress, IREC 2021

作者： Kraiem, Sana Hadj Slama, Jaleleddine Ben Hamouda, Mahmoud Université De Sousse Ecole Nationale d'Ingénieurs De Sousse LATIS- Laboratory Of Advanced Technology And Intelligent Systems Sousse4023 Tunisia

ISBN: (纸本)9781665432900

In this paper, a comparative study between three chaotic carrier waveforms is carried out based on conducted Electromagnetic Interference (EMI). For this purpose, a High-Frequency (HF) model of single-phase transformerless grid-connected photovoltaic inverter topology is proposed and simulated using co-simulation technique between SPICE-based circuit software and MATLAB/ Simulink. The obtained results show that conducted emission is almost the same with sawtooth, triangular and inverse sawtooth carriers. Moreover, the performance in terms total harmonic distortion of the modulated output voltage is investigated to emphasize the importance of appropriate parameter selection of chaotic algorithms. © 2021 IEEE.

关键词： SPICE

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GestureTeach: A gesture guided online teaching interactive model

GestureTeach: A gesture guided online teaching interactive m...

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作者： Liu, Hongjun Yao, Chao Zhang, Yalan Ban, Xiaojuan Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Artificial Intelligence School of Computer and Communication Engineering School of Intelligence Science and Technology Key Laboratory of Intelligent Bionic Unmanned Systems Ministry of Education University of Science and Technology Beijing Beijing China Institute for Materials Intelligent Technology Liaoning Academy of Materials Shenyang China

Online education has become more popular and effective due to the availability of high-speed internet and technological innovations, which allow people from different locations to access educational resources and opportunities. However, online classes often face challenges such as limited interactivity and display options, which can affect the quality and effectiveness of the online learning experience. In this article, we propose GestureTeach, a new pedagogical paradigm that enables free handwriting interaction and animation generation for online teaching. GestureTeach uses gestures as a natural and intuitive way of interaction, which enhances the teacher's intention expression and the student's engagement. GestureTeach also generates animations from handwritten sketches, which improves the display effects of the interaction and the student's knowledge comprehension. We conducted a two-stage study with 15 teachers and 90 students to evaluate the effectiveness of GestureTeach in facilitating classroom interaction. The results show that GestureTeach is preferred by both teachers and students over traditional online teaching methods and has the potential to transform the online teaching landscape by providing a seamless and interactive experience. © 2023 John Wiley & Sons Ltd.

关键词： Students

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Electrical Impedance Tomography Image Reconstruction with apriori Knowledge for Gesture Recognition 19

Electrical Impedance Tomography Image Reconstruction with ap...

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19th IEEE International Multi-Conference on systems, Signals and Devices, SSD 2022

作者： Alasasfeh, Hayat Hafsa, Mariem Bader, Oumaima Ibbini, Mohammed Hasan, Sameer Kanoun, Olfa Jordan University of Science and Technology Biomedical Engineering Department Irbid Jordan Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS- Laboratory of Advanced Technology and Intelligent Systems Sousse4023 Tunisia Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany

ISBN: (数字)9781665471084

ISBN: (纸本)9781665471084

Electrical impedance tomography (EIT) reconstructs the conductivity images of an object based on the voltages and the currents at the surface of the object. Among the clinical applications of EIT thorax imaging, brain function monitoring and breast cancer screening. However, EIT suffers from a poor signal-to-noise ratio and spatial resolution. To improve the quality of reconstructed images and provide clear information about the structure, the paper proposes to include prior knowledge about the structure from MRI. The proposed techniques could be very promising with more work. To illustrate this technique in this paper, eight electrodes with the adjacent current pattern were employed in this research. For each gesture, forty data points are recorded. The Gauss-Newton and Back-Projection algorithms are used for image reconstruction with prior knowledge of the human forearm from MRI images. The resultant contours of the Forearm, Ulna, and Radius have been used to build the mesh. In the Gauss-Newton algorithm, the results reveal that structural information improves image quality and conductivity distribution, particularly in the region of two bones. In addition, the reconstructed images using the Gauss-Newton algorithm performed better than images reconstructed using the back-projection algorithm. © 2022 IEEE.

关键词： Image reconstruction

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Review and Discussion of Recent Codes for Inverter-Based RESs and PPMs Under Grid Voltage Sag Conditions

Review and Discussion of Recent Codes for Inverter-Based RES...

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2023 IEEE International Conference on Artificial Intelligence and Green Energy, ICAIGE 2023

作者： Letaief, Fathia Hamouda, Mahmoud Al-Haddad, Kamal Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS-Laboratory of Advanced Technology and Intelligent Systems Sousse Tunisia École de Technologie Supérieure Canada Research Chair in Energy Conversion and Power Electronics Crcecpe MontréalQCH3C 1K3 Canada

ISBN: (纸本)9798350325539

Grid codes evolve to address emerging challenges posed by the increasing integration of Renewable Energy Sources (RESs). This paper discusses voltage sag incidents and common classification approaches. It also offers a concise overview of the latest European grid codes governing inverter-based RESs and power generators connected asynchronously (Power Park Modules) during voltage sag occurrences. To assess the power system's performance in unbalanced voltage sag situations, we propose a control strategy inspired by recent German grid codes. Simulation outcomes substantiate the power system's ability to provide voltage support when employing the proposed control strategy. © 2023 IEEE.

关键词： Electric inverters

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Facile assembly of flexible,stretchable and attachable symmetric microsupercapacitors with wide working voltage windows and favorable durability

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Microsystems & Nanoengineering 2024年第4期10卷 297-304页

作者： Xiangguang Han Xiaoyu Wu Libo Zhao Min Li Chen Jia Zhikang Li Jiaqi Xie Guoxi Luo Ping Yang Rabah Boukherroub Yurdanur Türker Mert UmutÖzkaynak Koray Bahadır Dönmez State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemXi’an Jiaotong UniversityXi’an 710049China School of Instrument Science and Technology Xi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai 264000China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’anShaanxi 710049China Chongqing Key Laboratory of Micro-Nano Systems and Intelligent Sensing Chongqing Academician WorkstationChongqing 2011 Collaborative Innovation Center of Micro/Nano Sensing and Intelligent Ecological Internet of ThingsChongqing Technology and Business UniversityNan’an DistrictChongqing 400067China Univ.Lille CNRSUniv.Polytechnique Hauts-de-FranceUMR 8520-IEMNF-59000 LilleFrance Sabanci University Nanotechnology Research and Application Center(SUNUM) IstanbulTurkey Department of Materials Science and Engineering Istanbul Technical UniversityIstanbulTurkey

With the increasing development of intelligent robots and wearable electronics,the demand for high-performance flexible energy storage devices is drastically *** this study,flexible symmetric microsupercapacitors(MSCs)that could operate in a wide working voltage window were developed by combining laser-direct-writing graphene(LG)electrodes with a phosphoric acid-nonionic surfactant liquid crystal(PA-NI LC)gel *** increase the flexibility and enhance the conformal ability of the MSC devices to anisotropic surfaces,after the interdigitated LG formed on the polyimide(PI)film surface,the devices were further transferred onto a flexible,stretchable and transparent polydimethylsiloxane(PDMS)substrate;this substrate displayed favorable flexibility and mechanical characteristics in the bending ***,the electrochemical performances of the symmetric MSCs with various electrode widths(300,400,500 and 600μm)were *** findings revealed that symmetric MSC devices could operate in a large voltage range(0–1.5 V);additionally,the device with a 300μm electrode width(MSC-300)exhibited the largest areal capacitance of 2.3 mF cm^(−2)at 0.07 mA cm^(−2)and an areal(volumetric)energy density of 0.72μWh cm−2(0.36 mWh cm^(−3))at 55.07μWcm−2(27.54mWcm−3),along with favorable mechanical and cycling *** charging for~20 s,two MSC-300 devices connected in series could supply energy to a calculator to operate for~130 s,showing its practical application potential as an energy storage ***,the device displayed favorable reversibility,stability and *** 12 months of aging in air at room temperature,its electrochemical performance was not altered,and after charging-discharging measurements for 5000 cycles at 0.07 mA cm^(−2),~93.6%of the areal capacitance was still retained;these results demonstrated its practical long-term application potential as an energy storage device.

关键词： cycling durability electrode

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A Chaotic Encryption Algorithm with Dynamic Key Enabled by Power-Division Multiplexed Transmission

A Chaotic Encryption Algorithm with Dynamic Key Enabled by P...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Ding, Yinchen Lei, Yi Lu, Qi Guo, Zhongyi Chen, Bin School of Computer Science and Information Engineering Hefei University of Technology Hefei China Hefei University of Technology Intelligent Interconnected Systems Laboratory of Anhui Province Hefei China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks China

Using power-division multiplexing, a chaotic encryption method is proposed based on dynamic key generated from the instantaneously transmitted information. The influence of power allocation is analyzed and the securit... 详细信息

ISBN: (纸本)9798350312614

关键词： chaotic encryption dynamic key Optical fiber communication physical layer security power-division mul-tiplexing

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A Transformer-based Siamese Network For Word Image Retrieval In Historical Documents

A Transformer-based Siamese Network For Word Image Retrieval...

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Smart World Congress (SWC), IEEE

作者： Abir Fathallah Mounîm A. El-Yacoubi Najoua Essoukri Ben Amara LATIS- Laboratory of Advanced Technology and Intelligent Systems Université de Sousse Institut Supérieur de l’Informatique et des Techniques de Communication Sousse Tunisie Institut Polytechnique de Paris Samovar Telecom SudParis Palaiseau France Ecole Nationale d’Ingénieurs de Sousse LATIS- Laboratory of Advanced Technology and Intelligent Systems Université de Sousse Sousse Tunisie

The increasing availability of digitized historical documents has sparked a need for effective information processing tools to extract the valuable information contained within them. Word spotting, an area of focus in historical document analysis, involves identifying specific words within images of documents. In this paper, we propose a novel approach for word spotting in historical Arabic documents, utilizing improved feature representations for learning word images. More precisely, we put forward an end-to-end approach for generating word image descriptors, based on the Siamese vision transformer architectures. The model learning is guided by a contrastive loss objective. Additionally, we carry out transfer learning techniques by leveraging knowledge acquired from two distinct source domains to generalize model learning. The proposed approach utilizes the embedding space to evolve the word spotting system by projecting the query word image and all reference word images into the embedding space, where their similarity is determined based on their corresponding embedding vectors. Our method is evaluated on the historical Arabic VML-HD dataset and the results indicate that our approach significantly outperforms state-of-the-art methods.

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Generalization of Reflection Modeling in Complex Cable Structure with Impedance Mismatches

Generalization of Reflection Modeling in Complex Cable Struc...

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Impedance Spectroscopy (IWIS), International Workshop on

作者： Dhia Haddad Najoua Essoukri Ben Amara Olfa Kanoun Professorship Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany LATIS- Laboratory of Advanced Technology and Intelligent Systems Université de Sousse Ecole Nationale d'Ingénieurs de Sousse Sousse Tunisie

ISBN: (数字)9798331507626

ISBN: (纸本)9798331507633

Cable networks are essential in modern systems, but they can develop defects due to environmental factors or wear, leading to signal degradation or reduced performance. These defects cause signal reflections in transmission lines due to impedance mismatches, either within the cables or between the cables and their port loads. Such reflections can result from junctions, soft faults (partial impedance changes), or hard faults, i.e., open or short circuits. Diagnosing these faults, especially using Time-Domain Reflectometry (TDR), requires accurately modeling how impedance mismatches affect signal reflections. This paper presents a model that takes a comprehensive approach to addressing various sources of impedance mismatches. It covers junctions, soft and hard faults, and mismatches between cables and connected devices. The model's thoroughness is evident in its ability to handle complex scenarios such as heterogeneous junctions, soft faults, multi-path reflections, input port reflections, and multi-load reflections. Additionally, it evaluates signal reflection measurability based on the components of the propagation path, further enhancing its robustness. The model's accuracy is validated through simulations using the distributed RLCG cable model, comparing predicted reflection values with simulated signals. The results show strong agreement, confirming the model's effectiveness in diagnosing faults in complex cable networks. This should instill confidence in the model's practical application, as it accurately correlates signal reflections with specific defects, paving the way for efficient fault diagnosis.

关键词： Power cables Predictive models Transmission line measurements Reflection Mathematical models Impedance Circuit faults Junctions Integrated circuit modeling Load modeling

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Fast Brillouin frequency shift estimation using digital elevation modeling method in BOTDR 4

Fast Brillouin frequency shift estimation using digital elev...

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4th International Computational Imaging Conference, CITA 2024

作者： Zan, Wei Liu, Xinyi Yang, Mingyuan Bai, Qai Wang, Yu Jin, Baoquan Key Laboratory of Advanced Transducers and Intelligent Control Systems Ministry of Education Taiyuan University of Technology Taiyuan030024 China College of Physics and Optoelectronic Engineering Taiyuan University of Technology Taiyuan030024 China College of Electronic Information Engineering Taiyuan University of Technology Taiyuan030024 China

ISBN: (纸本)9781510688834

In the practical application of Brillouin optical time-domain reflectometry (BOTDR) in temperature and strain monitoring, enhancing measurement speed remains a critical challenge. This paper presents a novel method for Brillouin frequency shift (BFS) estimation utilizing level set and digital elevation modeling (DEM). The algorithm demonstrates superior time efficiency. At the same time, the accuracy of the scheme is proved in the comparation experiment and correlation analysis. The method reduces computational time, without spatial resolution or measurement error degradation. © 2025 SPIE.

关键词： Digital elevation model

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Simultaneous enhancement of sensitivity, resonant frequency, and overload capability of piezoresistive accelerometers by heavily-doped fillet structures on sensing beams

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IEEE Sensors Journal 2025年第11期25卷 19138-19146页

作者： Xia, Yong Wang, Tao Lv, Yang Han, Xiangguang Yu, Mingzhi Tan, Renjie Huang, Mimi Jia, Chen Zhao, Libo Sun, Lin Yang, Ping Lu, Dejiang Xi'an Jiaotong University School of Mechanical Engineering State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies Xi'an710049 China Ningbo CRRC Times Transducer Technology Co. LTD Department of Basic Research and Development Ningbo315021 China Research Institute for Intelligent Sensing Technology and System School of Instrument Science and Technology State Key Laboratory for Manufacturing Systems Engineering State Industry-Education Integration Center for Medical Innovations International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies Xi'an Jiaotong University Xi'an710049 China Shandong Laboratory of Advanced Materials and green Manufacturing at Yantai Yantai264000 China

High sensitivity, high natural frequency, and high overload capability are desired for accelerometers used in industrial applications, but simultaneously enhancing all is challenging. Here, via designing novel heavily-doped fillet structures, we prove the sensitivity, resonant frequency, and overload capability can be simultaneously enhanced. The enhancements are attributed to regulations of stress concentration and effective sensing regions by the heavily-doped fillets. The sensors with and without fillets are designed, fabricated, packaged, and tested. The results show a sensitivity of 0.31±0.02 mV/g@5V, a natural frequency of 37.87±2.09 kHz, and an overload of 10040.17±531.76 g for sensors with 10-μm fillets, which are superior to 0.27±0.01 mV/g@5V, 34.13±0.90 kHz, and 7368.55±843.92 g for those no-fillet counterparts. Additionally, the developed sensor further exhibited feasibility in air-bearing vibration monitoring. The proposed design is envisioned to give insights into the novel designs of high-performance stress-based sensors, including accelerometers, pressure sensors, and strain gauges. © 2001-2012 IEEE.

关键词： Strain gages

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