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Hybrid Multifunctional Arc Suppression Inverter With Its Steady and Transient State Operation Optimization Method

IEEE Transactions on Power Electronics 2025年第8期40卷 10313-10323页

作者： Huang, Zejun Guo, Qi Xiao, Zekun Tu, Chunming Sun, Kai Wang, Lei Zhu, Donghai Hou, Yuchao Hunan University College of Electrical and Information Engineering Changsha410082 China Tsinghua University Faculty of Electrical Engineering Beijing100084 China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan430074 China Tsinghua University Tsinghua Shenzhen International Graduate School Shenzhen518000 China

A hybrid arc suppression device (HASD) is a state-of-the-art device that can work for arc suppression, reactive power compensation, and fault regulation. However, the transient problem is prominent when HASD switches modes. In addition, the active power is consumed by HASD during single line-to-ground (SLG) faults, and additional dc power supply devices are normally required for HASD. To greatly reduce the cost of HASD, a dc-link voltage control strategy based on the additional loop is proposed in this article. Compared with the traditional strategy, the proposed control strategy can absorb the active power from the power grid without adding additional dc power supply devices. Second, a transient state optimization method is proposed to realize the flexible transition between different functions of HASD. The command value of arc suppression current is increased from 0 to the maximum value during flexible switching, which reduces the transient voltage and the operational stability of HASD is apparently enhanced. Moreover, the correctness, feasibility and effectiveness of the proposed methods are verified by the simulation and experiment results. The corresponding results show that HASD achieves superior steady and transient performance when the proposed operation optimization method is adopted. © 1986-2012 IEEE.

关键词： Electromagnetic transients

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Long-range enhancement for fluorescence and Raman spectroscopy using Ag nanoislands protected with column-structured silica overlayer

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Light(science & Applications) 2024年第12期13卷 3158-3170页

作者： Takeo Minamikawa Reiko Sakaguchi Yoshinori Harada Hiroki Tanioka Sota Inoue Hideharu Hase Yasuo Mori Tetsuro Takamatsu Yu Yamasaki Yukihiro Morimoto Masahiro Kawasaki Mitsuo Kawasaki Department of Systems Innovation Graduate School of Engineering ScienceOsaka UniversityOsaka 560-8531Japan Division of Interdisciplinary Researches for Medicine and Photonics Institute of Post-LED PhotonicsTokushima UniversityTokushima 770-8506Japan Department of Pathology and Cell Regulation Graduate School of Medical ScienceKyoto Prefectural University of MedicineKyoto 602-8566Japan PRESTO Japan Science and Technology Agency(JST)Tokushima 770-8506Japan Institute for Integrated Cell-Material Sciences(iCeMS) Kyoto UniversityKyoto 606-8501Japan Department of Synthetic Chemistry and Biological Chemistry Graduate School of EngineeringKyoto UniversityKyoto 615-8510Japan Department of Medical Photonics Graduate School of Medical ScienceKyoto Prefectural University of MedicineKyoto 602-8566Japan Technology and Engineering Division Ushio Inc.Hyogo 671-0224Japan The Institute of Science and Industrial Research Osaka UniversityOsaka 567-0047Japan Department of Molecular Engineering Graduate School of EngineeringKyoto UniversityKyoto 615-8510Japan

We demonstrate long-range enhancement of fluorescence and Raman scattering using a dense random array of Ag nanoislands(AgNIs)coated with column-structured silica(CSS)overlayer of over 100 nm thickness,namely,remote plasmonic-like enhancement(RPE).The CSS layer provides physical and chemical protection,reducing the impact between analyte molecules and metal *** plates are fabricated with high productivity using sputtering and chemical immersion in gold(I)/halide *** RPE plate significantly enhances Raman scattering and fluorescence,even without proximity between analyte molecules and metal *** maximum enhancement factors are 10^(7)-fold for Raman scattering and 102-fold for *** is successfully applied to enhance fluorescence biosensing of intracellular signalling dynamics in HeLa cells and Raman histological imaging of oesophagus *** findings present an interesting deviation from the conventional near-field enhancement theory,as they cannot be readily explained within its ***,based on the phenomenological aspects we have demonstrated,the observed enhancement is likely associated with the remote resonant coupling between the localised surface plasmon of AgNIs and the molecular transition dipole of the analyte,facilitated through the CSS *** further investigation is warranted to fully understand the underlying mechanisms,the RPE plate offers practical advantages,such as high productivity and biocompatibility,making it a valuable tool for biosensing and biomolecular analysis in chemistry,biology,and *** anticipate that RPE will advance as a versatile analytical tool for enhanced biosensing using Raman and fluorescence analysis in various biological contexts.

关键词： structure silica protected

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RTK-UAV Laser Surveying Applied to Monitoring of Mine Residual Walls 14

RTK-UAV Laser Surveying Applied to Monitoring of Mine Residu...

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14th IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2024

作者： Wu, Jieling Saito, Mitsugu Suwa University of Science Applied Information Engineering Faculty of Engineering Chino Japan Graduate School of Engineering Iwate University Design and Media Technology Morioka Japan

ISBN: (纸本)9798350366556

The challenges of conducting mining operations in open-pit mines, especially while attempting to maintain a stable residual wall, crucially relate to ensuring the safety of miners and preserving the landscape. Currently, many mines monitor the displacement of the pointwise residual wall using APS and GPS with light wave rangefinders, but it is difficult to capture the areal behavior of the residual wall. However, issues persist such as equipment failure and the need for timely monitoring;thus, UAVs, which allow for highly accurate, safe, and efficient surveying, are being used. This study aims to develop a regular monitoring system, using RTK-UAV laser surveying, designed to ensure the safety of the residual wall slope. © 2024 IEEE.

关键词： Laser safety

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Development and Evaluation of Automatic Facemask Template Generator 5

Development and Evaluation of Automatic Facemask Template Ge...

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5th International Conference on Biomedical engineering, IBIOMED 2024

作者： Kikuchi, Takehito Okamura, Misaki Hamakawa, Hiromitsu Oita University Faculty of Science and Technology Oita Japan Graduate School of Engineering Oita University Oita Japan

ISBN: (纸本)9798350389265

The COVID-19 pandemic has resulted in the normalization of wearing masks in public spaces. However, commercially available masks assume symmetrical faces and are unsuitable for faces deformed by diseases or accidents. Therefore, it is important to make face masks that fit the faces of individuals. To address this problem, we developed a prototype of an automatic facemask template generator for individuals using the three-dimensional surface data of their faces. In a previous study, we proposed the generation of a face mask template from a set of portrait and profile images of a user's face. This method was evaluated using airflow tests to check for air leakage around the masks. The results show that the proposed mask has a better protection ability;however, its fitness also affects the three-dimensional shapes of faces. To improve the fitting and droplet protection performance, we developed a new method for an automatic template generator using three-dimensional facial data. This study describes the basic architecture of the generator and the results of airflow and fitness tests as evaluations. Flow analysis was conducted using particle image velocimetry and a mannequin with three types of facemasks. The proposed mask conditionally reduced the flow rate in front of mouth compared to that in the other two masks. In the fitness experiments, two masks were fabricated using this software and the positional error for each feature point was measured. Subsequently, although the maximum error was 17.9 mm for the mental protuberance, the subjects subjectively felt a better fit with the proposed mask. © 2024 IEEE.

关键词： Velocimeters

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Robust Underwater Positioning System Using LED Markers and Perspective-n-Point Solver

Robust Underwater Positioning System Using LED Markers and P...

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2025 IEEE Underwater technology, UT 2025

作者： Kitano, Emi Ebihara, Tadashi Wakatsuki, Naoto Maeda, Yuka Graduate School of Science and Technology University of Tsukuba Ibaraki Japan Institute of Systems and Information Engineering University of Tsukuba Ibaraki Japan

ISBN: (纸本)9798331534189

Swarm operations of underwater robots are gaining attention as a means of performing more complex and efficient tasks underwater. For successful operation, each underwater robot must know its position and pose. Traditional underwater acoustic positioning using ultrasonic waves has the advantage of providing wide-area coverage. However, the large size of those systems makes them difficult to mount on smaller robots such as those used in underwater robot swarms. This paper proposes a new simultaneous position and pose measurement system suitable for underwater robot swarm operations. In this system, a camera is mounted on each robot, and the relative position and pose of the light-emitting diodes (LEDs) are based on the coordinates of several known LEDs and the images captured by the camera. The effectiveness of the proposed positioning system using LEDs and cameras is verified through experiments in a test tank. © 2025 IEEE.

关键词： Cameras

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Visualization Methods for Bookmarks to Facilitate Recall Them Recorded during Casual Web Browsing

Visualization Methods for Bookmarks to Facilitate Recall The...

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2024 IEEE International Conference on Consumer Electronics, ICCE 2024

作者： Sato, Riko Nakashima, Makoto Sato, Keizo Oita University Graduate School of Engineering Oita Japan Oita University Faculty of Science and Technology Oita Japan

ISBN: (纸本)9798350324136

Thanks to the vast amount of information on the web, people can smoothly find and gather the information they want. Bookmarks are the most popular and convenient way to save such collected information to review later. However, bookmarks recorded through casual web browsing tend to lose their cues for recall quickly. We propose two bookmark visualization methods for a web browser to facilitate the recall of such a bookmark based on the hypotheses focused on human recall activities. While the results of the user experiment showed the possibility of supporting recall by visualizing information collection paths, problems remained in establishing cues for recall using words on web pages. © 2024 IEEE.

关键词： bookmark visualization methods recall of collected information web casual browsing

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Microstructure and Glass Formation in Rapidly Solidified FeCoNiCrBSi Alloys

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Zairyo/Journal of the Society of Materials science, Japan 2023年第3期72卷 231-233页

作者： Zhang, Yicheng Tokunaga, Tatsuya Graduate School of Engineering Kyushu Institute of Technology Tobata-ku Kitakyushu804-8550 Japan Department of Materials Science and Engineering Faculty of Engineering Kyushu Institute of Technology Tobata-ku Kitakyushu804-8550 Japan

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FUNDAMENTAL STUDY ON AUTOMOTIVE DISC BRAKE HOT JUDDER CAUSED BY SELF-EXCITED VIBRATION WITH TIME DELAY 30

FUNDAMENTAL STUDY ON AUTOMOTIVE DISC BRAKE HOT JUDDER CAUSED...

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30th International Congress on Sound and Vibration, ICSV 2024

作者： Nakae, Takashi Ryu, Takahiro Kawasaki, Kanu Kitamura, Junichi Oita University Faculty of Science and Technology Oita Japan Oita University Graduate School of Engineering Oita Japan

ISBN: (纸本)9789090390581

Recently, a surge in vibration problems known as hot judder has become common in disc brakes during high-speed braking. However, the automotive industry has yet to fully understand not only a mitigation method but also the underlying generation mechanism. This research endeavors to elucidate the fundamental generation mechanism of hot judder by modeling it as self-excited vibration resulting from time delays induced by disc deformation due to heat. To this end, a basic three-degree-of-freedom system was employed for analysis by a stability assessment. Additionally, the vibration analysis model incorporated the influence of disc surface wear, given previous reports indicating significant wear at hot spots. Numerical integration employing the Runge-Kutta-Gill method was used to analyze deceleration effects as well. It was found that although the number of hot spots changes with the disc rotation speed, the generation frequency is constant regardless of the number of hot spots and is always equal to the natural frequency of the system. Moreover, the hot spots occur where the disc expansion is the largest, and these hot spots cause the hot judder. Furthermore, by focusing on the amplitude growth of a certain number of hot spots, we found that the number of hot spots increases as each hot spot repeats growth and decay as the speed decelerates. © 2024 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Detection of arbitrary vortex beams using computer-generated holograms printed on an azo-carbazole polymer film

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Journal of the Optical Society of America B: Optical Physics 2025年第6期42卷 1264-1271页

作者： Yamazaki, Ikuma Jackin, Boaz Jessie Sakai, Wataru Tsutsumi, Naoto Kinashi, Kenji Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto606-8585 Japan Department of Information Science Faculty of Science and Technology Kochi University 2-5-1 Akebono-cho Kochi780-8072 Japan Faculty of Materials Science and Engineering Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto606-8585 Japan

Optical vortices, carried by light beams, are of significant interest due to their intrinsic properties, such as orbital angular momentum and unbounded topological charge, making them valuable for numerous applications. However, conventional methods for generating and detecting these beams often rely on bulky optical setups or complex material fabrication. In this paper, we present a simple and efficient approach for the simultaneous detection of multiple vortex beams. By digitally printing computer-generated holograms on an azo-carbazole polymer film, we generate multiple collinearly superposed optical vortex beams of arbitrary topological charge. Then, we detect the individual topological charges from the superposed beam by employing a second computer-generated hologram. The second hologram diffracts each individual vortex beam to a predefined spatial position, and the individual topological charges can be determined by detecting these positions. We show the simultaneous detection of up to three vortex beams using a straightforward and compact arrangement. This technique offers an accessible solution for potential use in optical encryption, storage, and communication technologies. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved. Journal © 2025 Optica Publishing Group.

关键词： Computer generated holography

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Evaluation of Irregular Motion in Endovascular Treatment

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Journal of engineering and science in Medical Diagnostics and Therapy 2025年第2期8卷 021204页

作者： Kobayashi, Kengo Takashima, Kazuto Toma, Naoki Mori, Koji Division of Mechanical Engineering Graduate School of Science and Technology for Innovation Yamaguchi University 2-16-1 Tokiwadai Ube Yamaguchi755-8611 Japan Department of Biological Functions Engineering Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology 2-4 Hibikino Wakamatsu-ku Kitakyushu808-0196 Japan Department of Neurosurgery Graduate School of Medicine Mie University 2-174 Edobashi Mie Tsu514-8507 Japan

Vascular intervention using guidewires and catheters has been widely performed, but the selection of appropriate device manipulation is often based on the experience and skills of the surgeon. Occasionally, accidents occur due to unexpected movements of these device tips, resulting in vascular damage. To address the challenge of unpredictable device motions and the associated risk of vessel wall damage, this study aims to investigate how different vessel shapes influence device motions. Additionally, we seek to identify effective manipulation techniques to mitigate these risks. We conducted experiments involving the insertion of a guidewire and a catheter into crank-shaped blood vessel phantom models with three different bending angles. Throughout the experiment, the movement of the inserted guidewire within the blood vessel phantoms was recorded using video recording. It was discovered that jumping distance and number of jumps increased as the distance between the catheter and guidewire tip increased. In experiments with a small bending angle, guidewire jumping was infrequent, but when it occurred, jumps tended to be longer (4.0 6 2.4 mm). Conversely, experiments involving large bending angles showed short consecutive jumps, with the last jumping distance typically being a relatively longer (2.5 6 1.3 mm). These findings indicate that irregular motions can be reduced by keeping a catheter close to a guidewire tip. Moreover, when the bending angle is large, a manipulator should be ready to prevent further motions as soon as they notice a small first jump. Copyright VC 2025 by ASME.

关键词： Catheters

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