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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Jin, Zhaoyang Kondo, Keiichiro Nishi, Kentaro Saito, rika School of Advanced Science and Engineering Waseda University Tokyo Japan R&d Center Jr East Group Environmental Engineering Research Laboratory Saitama Japan

ISBN: (纸本)9784886864406

The Shinkansen, as a highly popular mode of transportation in Japan, consumes and regenerates substantial amounts of electricity energy. Because of the AC power supply of Shinkansen, the energy generated by regeneration braking of the Shinkansen is wasted and sent back to the commercial power grid if there is no other Shinkansen in same power feeding section. To effectively utilize this surplus energy, the ground-based energy storage systems is necessary. Cascade H bridge (CHB) system has advantages such as ease of modularization and low voltage stress on switching devices, making it widely used in high-voltage and high-power applications. The CHB is also used in ground-based energy storage systems of Shinkansen. However, CHB has issues like unbalanced voltage and power between different modules. In this study, the relationship between battery capacity of each module and the maximum unbalanced charging power that the CHB can withstand is studied to ensure that there is sufficient battery capacity during the design phase to guarantee the system has enough unbalanced charging capability. © 2024 The Institute of Electrical Engineers of Japan.

关键词： State of charge

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Innovative Smart Network Enabled Charging Station for Future Electric Vehicle

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Journal of The Institution of Engineers (India): Series B 2024年第1期105卷 147-156页

作者： Paramasivam, Alagumariyappan Vijayalakshmi, Sankaran Swamynathan, Kudiyarasan Mahalingam, N. Gughan, N.M. Department of Biomedical Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Chennai India Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Chennai India Electrical Group Bharatiya Nabhikiya Vidyut Nigam Limited Tamilnadu Kalpakkam603102 India School of Mathematics University of Leeds Leeds United Kingdom

renewable energy has become a major resource in the twenty-first century due to the excess usage of oil. The world is being transitioned to develop technology which uses renewable energy as its core element. The common renewable energy includes solar, wind, wave, geothermal. As technology develops, the Electric Vehicle became a demanding factor in the automobile sector. Increase in Electric vehicle production leads to the creation of the charging station. In this paper, a charging station is designed by utilizing the solar energy as a primary source. The primary focus of the charging station is the dC–dC converter which extracts energy from the PV Array. Further, the charging station detects the vehicle using YOLO v3 model and charge its battery. Additionally, the battery energy information in the charging station can be shared between other charging stations. © 2023, The Institution of Engineers (India).

关键词： Electric vehicles

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ASEGAA: Leveraging Attention in Emotion, Gender and Age Analysis from Speech 15

ASEGAA: Leveraging Attention in Emotion, Gender and Age Anal...

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15th International Conference on Computing Communication and Networking Technologies, ICCCNT 2024

作者： Sigicharla, Indra ritesh, Aron Tiwari, Sourabh Syed Ibrahim, S.P. Vellore Institute of Technology School of Computer Science and Engineering Chennai India Samsung R&d Institute Voice Intelligence Group Bengaluru India

ISBN: (纸本)9798350370249

This paper investigates the effectiveness of attention mechanisms in speech classification tasks for predicting age, gender, and emotion. despite the success of attention in multimodal systems, its applicability to speech context preservation remains underexplored. We examine this using the SEGAA model alongside our ASEGAA (Attention in Speech Emotion Gender and Age Analysis) models. Experiments on CrEMAd and EMO-dB datasets reveal challenges in capturing speech context due to limited MFCC correlation. Speech attention models struggle to maintain context, leading to reduced accuracy compared to non-attention speech models. The results highlight the significance of feature selection and advocate for further exploration of alternative mechanisms. In terms of F1 scores, the multi-output SEGAA model achieves relatively high scores across age, emotion, and gender prediction tasks. However, attention mechanisms such as ASEGAA attention at end and ASEGAA Interspersed Attention exhibit fluctuating F1 scores, suggesting differing impacts on context preservation across the prediction tasks. © 2024 IEEE.

关键词： Attention CNN deep Learning Speech Processing

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detection of Low-Frequency Vibration Using Fiber Bragg Grating Interrogation System 6

Detection of Low-Frequency Vibration Using Fiber Bragg Grati...

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6th IEEE Eurasia Conference on Biomedical engineering, Healthcare and Sustainability, ECBIOS 2024

作者： Shih, Ming-Chang Hong, Ming-Jing Lan, Wen-How Fang, Steve National University of Kaohsiung Dept. of Electrical Engineering Kaohsiung Taiwan Corporate R&d Center Ase Group Kaohsiung Kaohsiung Taiwan

ISBN: (纸本)9798350396133

Vibration modes analysis is commonly used to detect the defects of mechanical devices, especially for the low-frequency vibration mode spectrum. The low-frequency mode is hard to detect by electro-mechanical detectors due to its limited sensitivity to low-frequency vibration. Thus, we developed a method using the Fiber Bragg grating sensor to detect the low-frequency vibration related to the operation of a motorcycle engine. © 2024 IEEE.

关键词： Fiber Bragg gratings

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Long Tail Withstand Voltage test (TOV test) on the HVdC Cable and Accessories of the Italy-France Intertie

Long Tail Withstand Voltage Test (TOV test) on the HVDC Cabl...

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2023 AEIT HVdC International Conference, AEIT HVdC 2023

作者： Battaglia, A. de Zan, r. Marzinotto, M. Palone, F. Patti, S. Berardi, G. Albertini, M. Bononi, S. Franchi Terna Engineering Department Rome Italy Prysmian Group R&d Electrical Laboratories and Services Milan Italy

ISBN: (纸本)9798350324891

The integration of HVdC VSC systems into the power transmission system raises new questions regarding dC transient fault voltage waveforms and their simulation in the laboratory. Numerical simulations reveal that waveforms not covered by the IEC standards can occur in the event of failures. In the meantime, such waveforms are proposed in the CIGrE TB 852 and 853 for HVdC cable systems. Still, the tolerances are wide, and the comparison of the test results may be difficult. The paper presents an overview about test voltage selection and testing activity performed on a 320 kV XLPE cable (terminations, cable and joints) with a typical length for type test loops, showing tests results. The paper also highlights the good fit between waveforms achieved in laboratory and the one actually happened in the field during operation. © 2023 IEEE.

关键词： HVdC power transmission

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Fracture geometry and breakdown pressure of radial borehole fracturing in multiple layers

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Petroleum Science 2024年第1期21卷 430-444页

作者： Yu-Ning Yong Zhao-Quan Guo Shou-Ceng Tian Lu-Yao Ma Tian-Yu Wang Mao Sheng National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China Beijing Petroleum Machinery Company Limited CNPC Engineering Technology R&D Company LimitedBeijing102206China Smart Energy Co. LtdChina Xiongan GroupXiong’an New Area071000HebeiChina

radial borehole fracturing that combines radial boreholes with hydraulic fracturing is anticipated to improve the output of tight oil and gas *** paper aims to investigate fracture propagation and pressure characteristics of radial borehole fracturing in multiple layers.A series of laboratory experiments with artificial rock samples(395 mm×395 mm×395 mm)was conducted using a true triaxial fracturing *** crucial factors corresponding to the vertical distance of adjacent radial borehole layers(vertical distance),the azimuth and diameter of the radial borehole are *** results show that radial borehole fracturing in multiple layers generates diverse fracture *** types of fractures are identified based on the connectivity between hydraulic fractures and radial *** vertical distance significantly influences fracture propagation perpendicular to the radial borehole *** increase in the vertical distance impedes fracture connection across multiple radial borehole layers and reduces the fracture propagation distance along the radial borehole *** azimuth also influences fracture propagation along the radial borehole *** the azimuth reduces the guiding ability of radial boreholes,which makes the fracture quickly curve to the maximum horizontal stress *** breakdown pressure correlates with diverse fracture geometries *** the fractures connect multi-layer radial boreholes,increasing the vertical distance decreases the breakdown *** the azimuth and increasing the diameter also decrease the breakdown *** extrusion force exists between the adjacent fractures generated in radial boreholes in multiple rows,which plays a crucial role in enhancing the guiding ability of radial boreholes and results in higher breakdown *** research provides valuable theoretical insights for the field application of radial borehole fracturing technology in tight oil and g

关键词： Multi-layer radial boreholes Hydraulic fracturing Fracture propagation Pressure characteristic

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Low False-Alarm Active Sonar detection under Strong reverberation

Low False-Alarm Active Sonar Detection under Strong Reverber...

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2024 OES China Ocean Acoustics, COA 2024

作者： Sibo, Li rui, Guo dianlun, Zhang Yujuan, Li Xiaoqian, Hou Shengfeng, Wang Science and Technology on Underwater Acoustic Laboratory/ Technology R&d Center Harbin Engineering University Haiying Enterprise Group Co. Ltd Wuxi Harbin China Technology R&d Center Haiying Enterprise Group Co. Ltd Wuxi China Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University Harbin China

ISBN: (纸本)9798350340297

In active low-frequency and high-power sonar systems, target detection must overcome strong reverberation. Active sonar reverberation interference strongly fluctuates with distance and exhibits significant temporal and spatial variations. Active sonar reverberation is a typical nonstationary background. Complex changes in reverberation directly affect the target detection performance of active sonar systems. The major difficulty associated with current detection algorithms lies in autonomous detection, particularly in terms of the adaptability of detection algorithms to complex background interference. Accurately performing dynamic background estimation, suppressing interference, controlling false alarms, and highlighting weak targets are the focus of object detection. This paper proposes an active sonar target detection method driven by a combination of data and models. The proposed method can achieve target detection under strong reverberation interference with low sidelobe false alarms and high robustness. © 2024 IEEE.

关键词： reverberation

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Study on dynamic Characteristics of Superconducting Electrodynamic Maglev Train

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Journal of Harbin Institute of Technology(New Series) 2024年第5期31卷 32-40页

作者： Xiaonong Wang Jingyu Huang Yue Fei Cheng Zhen National Maglev Transportation Engineering R&D Center Tongji UniversityShanghai 201804China Chengdu Hangli(Group)Industrial Co. LtdChengdu 611937China

This study considers a superconducting electrodynamic maglev train of MLX01 *** characteristics of the electromagnetic spring coefficient of a single bogie under different magnetomotive force(MF) of the superconducting coil and standard air gap(Sag) were *** view of the small electromagnetic damping,a passive damping control strategy and an active damping control strategy were designed to increase the electromagnetic damping force between the superconducting coil and ground *** with the coupling numerical model of a single bogie,the vibration characteristics of the bogie in different directions with different damping control strategies were studied when the Sag and MF were *** results can provide important theoretical support for stable operation control of maglev trains.

关键词： superconducting electrodynamic maglev train electromagnetic spring characteristics damping control strategy dynamic characteristics

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Automatic Kick detection Using Artificial Intelligence

Automatic Kick Detection Using Artificial Intelligence

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2024 International Petroleum Technology Conference, IPTC 2024

作者： Sha, Qihao ding, Yan Cui, Meng Cui, Yi Gao, reyu Zhao, Fei Xing, Shiwang Lyu, Congyue CNOOC Gas and Power Group Beijing China CNPC Engineering Technology R&D Company Limited Beijing China Beihang University Beijing China

ISBN: (纸本)9781959025184

Complications related to kick account for more than half of total well cost. Kick is unintended influx of formation fluids into the wellbore when the pressure found within the formation is higher than the mud hydrostatic pressure. If the event cannot be detected and controlled in time, they will lead to increased nonproductive time (NPT) and costs. For example, the maximum killing pressure required will be more than two times higher if the kick is detected 15 min later. To kill a kick, actions like circulating the well with heavier/lighter mud will require the field engineers to stop drilling. Even worse, a kick can potentially result in a blow-out event, which can lead to loss of life and a company's reputation. In recent years, people have made dramatic progress in kick detection. In general, they can be divided into physical-based models and data-driven approaches. For physical-based models, predicted values of the kick indicators are calculated and compared with the actual values. However, most of the physical-based models are unable to deal with complex situations, such as directional drilling and change of formation, temperature change, compressibility of fluids, etc. The pattern recognition approaches mainly consider the flow pattern. Moreover, these methods only recognize simple patterns, which might not be enough for real field application, where the data can be dirty and noisy. The models' performance can also be severely impacted if the labels are unbalanced. We propose to build a real-time alarm system for early kick detection using artificial intelligence and real-time drilling data. The goal is to use this automatic alarm system to predict kick events ahead of time and hence reduce NPT. First of all, the historical drilling data need to be integrated with daily drilling reports to recognize the kick events and routine daily operations. Second, calculating the possibility of kick from the drilling data, by applying our statistical method. Then, the prep

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A Novel Method for Extracting Asymmetric Source and drain resistance in IGZO Vertical Channel Transistors

A Novel Method for Extracting Asymmetric Source and Drain Re...

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2024 IEEE Symposium on VLSI Technology and Circuits, VLSI Technology and Circuits 2024

作者： Yoo, S.W. Lee, Y. Jung, W.J. Kim, H. Byeon, S. Kim, M. Lee, J. Lee, T. Hong, M.J. Song, Y.G. Lee, S. Terai, M. Yoo, K.J. Sung, C. Lee, W. Cho, M.H. Kim, d. Ha, d. Ahn, S. Song, J.H. Semiconductor R&d Center Korea Republic of Computational Science & Engineering Group Samsung Electronics Co. Ltd. Hwaseong Korea Republic of

ISBN: (纸本)9798350361469

Unlike conventional resistance extraction method, a novel method enabling to simply extract the source/drain resistance including contact resistance is, for the first time, hereby proposed in the IGZO vertical channel transistor (VCT). IGZO VCT has uneven source and drain structure inducing considerable asymmetricity in source and drain resistances, thus the extraction of them is very important. This method is based on the fact that the amount of current varies significantly depending on the direction of electron injection in the structure forming the schottky contacts. Experimental results show that this method is adequate to evaluate improvements in the contact resistance and thus applicable for source and drain resistance analysis in oxide semiconductor structures. © 2024 IEEE.

关键词： asymmetric source/drain IGZO source/drain resistance vertical channel transistor (VCT)

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