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13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Satsuki, Kengo Yaginuma, Hideki Terabe, Shintaro Graduate School of Science and Technology Tokyo University of Science Department of Civil Engineering Chiba Japan Faculty of Science and Technology Tokyo University of Science Department of Civil Engineering Chiba Japan

ISBN: (纸本)9798350355079

Generally, AI training data for object detection purposes consists of footage captured in real-world settings. In this study, we propose using footage generated from a digital twin constructed within a game engine as training data, instead of using actual footage. We evaluated the performance using night-time footage, where the pretrained model, trained on the COCO Dataset, exhibited significantly poor accuracy. By training the model with images created using the method developed in this study, we observed a substantial improvement in Average Precision (AP) from 69% to 88% compared to the pretrained model. Additionally, significant improvements were also observed at other test locations. Based on these results, it is considered that this method is effective in enhancing the performance of object detection. © 2024 IEEE.

关键词： Velocity measurement

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EVALUATION OF URBAN PUBLIC SPACE WITH DO IT YOURSELF CHECKLIST AND CONSIDERATION AS EVALUATION METHOD ‐ A case study on Nishigawa area in Okayama city ‐

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AIJ Journal of technology and Design 2024年第75期30卷 1015-1020页

作者： Hirofumi, Hori Minjeong, Park Takuma, Takaoka Takehito, Ujihara Faculty of Environmental Life Natural Science and Technology Okayama Univ. Japan Graduate School of Environmental and Science Okayama Univ Japan Dept. of Architecture and Civil Engineering Toyohashi Univ. of Technology Japan

Recently, there has been an increase in the number of activities known as "placemaking". Placemaking has been pioneered in the United States, and the "Do It Yourself Checklist" evaluation items proposed by PPS (Project for Public Spaces), a NPO based in NY, are widely recognized. No existing studies have evaluated spaces using the "Do It Yourself Checklist". Therefore, the purpose of this study is to confirm the effectiveness of this item as a tool for space evaluation in Japanese public spaces. As a result of the study, some items were not validated as spatial assessment items in Japanese cities. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Do It Yourself Checklist Okayama city Placemaking Project for Public Spaces Space evaluation

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In Situ Acoustic Emission Investigation of Asphalt Fracture Process and Damage Quantification for Different Asphalt Mixtures

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Journal of Nondestructive Evaluation, Diagnostics and Prognostics of engineering systems 2025年第3期8卷 031001页

作者： Zhu, Yu Wang, Haixu Sun, Xiaojun Li, Feng Guan, Xuefei Huang, Min He, Jingjing Beijing Research Institute of Aero Engines AECC Beijing101304 China Beijing Institute of Space Science and Technology Information Beijing100086 China School of Transportation Science and Engineering Beihang University Beijing100191 China Graduate School of China Academy of Engineering Physics Beijing100193 China School of Reliability and Systems Engineering Beihang University Beijing100191 China

The identification of cracking damage and the dynamic diagnosis of damage evolution are of great importance to prolong the service life of asphalt mixture materials. Acoustic emission (AE) can identify the formation and propagation of cracks by detecting the released energy of the damage;therefore, it provides a viable real-time technique to estimate the damage state in the context of structural health monitoring. In this study, the crack formation and propagation of three different asphalt mixtures were investigated using in situ AE monitoring and microscopy imaging. A three-point bending test was performed using specimens fabricated from three different types of asphalt mixtures. The variation of AE parameters such as the cumulative AE energy and the AE count was obtained and correlated with the crack sizes to characterize the damage process of the three mixtures. Based on the AE parameters, the whole damage process can be divided into three distinct phases, namely, the elastic deformation, damage accumulation, and crack propagation. The AE parameters in the three different mixtures show unique features, and they can be used to capture the transition between phases and identify the damage state. A universal power law model is proposed to correlate the AE energy and the crack density for different types of asphalt mixtures, providing a viable means for damage quantification and predictive maintenance. © 2024 by ASME.

关键词： Structural health monitoring

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RobustFace: a novel image restoration technique for face adversarial robustness improvement

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Multimedia Tools and Applications 2025年第11期84卷 8965-8993页

作者： Sadu, Chiranjeevi Das, Pradip K. Yannam, V Ramanjaneyulu Nayyar, Anand Department of Computer Science and Engineering RGUKT Nuzvid Andhra Pradesh Nuzvid India Department of Computer Science and Engineering IIT Guwahati Assam Guwahati India School of Technology Woxsen University Telangana Hyderabad India Graduate School Faculty of Information Technology Duy Tan University Da Nang550000 Viet Nam

Machine Learning (ML) models, particularly Deep Learning (DL), have made rapid progress and achieved significant milestones across various applications, including numerous safety-critical contexts. However, these models have recently been discovered to be susceptible to adversarial attacks, which are well-crafted input images. The primary objective of this paper is to propose a novel methodology titled "RobustFace", which is based on deep image restoration networks, that significantly improves the facial adversarial robustness of various image-classification models. Adversarial images are created using the Private Fast Gradient Sign Method (P-FGSM), StyleGAN and Fast Landmark Manipulation (FLM) methods. The adversarial images are then enhanced using deep image restoration networks to bring back them into the original space. The encoded weighted local magnitude patterns (WLMP) are extracted and provided to different types of classifiers to detect facial adversarial images from the clean images. The effectiveness of RobustFace has been demonstrated on two real-world datasets and experimental outcomes show that it significantly improves facial adversarial robustness on all evaluating classifiers. It improves the highest classification accuracy from 98.75% to 99.00% on P-FGSM attacks, from 77.94% to 85.25% on adversarial attacks generated by StyleGAN and from 65.52% to 69.50% for FLM attacks. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2024.

关键词： Image reconstruction

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Experiments and Analyses on Heat Transfer Characteristics from a Solid Wall to a Strip-ShapedWick Structure

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Frontiers in Heat and Mass Transfer 2024年第3期22卷 687-702页

作者： Kenta Hashimoto Guohui Sun Yasushi Koito Department of Mechanical and Mathematical Engineering Graduate School of Science and TechnologyKumamoto UniversityKumamoto860-8555Japan Division of Industrial Fundamentals Faculty of Advanced Science and TechnologyKumamoto UniversityKumamoto860-8555Japan

Centered or striped wick structures have been used to develop ultrathin heat *** from traditional heat pipes,the centered or striped wick structures leave noncontact container surfaces with the wick *** this study,experiments andnumerical analyseswere conductedtoinvestigate the influenceof thesenoncontact *** the experiments,a strip-shaped wick structure was placed vertically,the top was sandwiched between wider rods and the bottom was immersed in a working *** rod width was greater than the wick width;thus,noncontact surfaces were left between the rod and the wick *** heat was applied from the rod to the wick structure,and the evaporation heat transfer characteristics of the working fluid from the wick structure were *** was used as the working *** experiments were conducted by varying the rod and wick *** experimental results were obtained when the wick structures were placed *** the numerical analyses,the temperature and heat flux distributions in the rod were *** the experimental and numerical results,it was confirmed that the noncontact surfaces caused the heat flux in the rod near both surfaces of the wick structure to concentrate,which increased the evaporation thermal resistance of the wick structure.A reduction in the noncontact surface area by increasing the wick width was found to be effective in decreasing the evaporation thermal resistance and increasing themaximumheat transfer rate of the wick *** separation of the wick structure increased the evaporation surface ***,its effectiveness was limited when the heat transfer rate was small.

关键词： Ultra-thin heat pipe centered wick structure striped wick structure conduction heat transfer evaporation heat transfer constriction thermal resistance

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Cooperative Multi-agent Reinforcement Learning for Multiple Anti-aircraft Target Surveillance

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Journal of Institute of Control, Robotics and systems 2024年第6期30卷 587-595页

作者： Lee, Kangbeen Baek, Seungjae Jung, Philjoon Kim, Tae-Hyun Jeon, Jeong Hwan Graduate School of Artificial Intelligence Ulsan National Institute of Science and Technology Korea Republic of Hanwha Systems Co. Ltd Korea Republic of Department of Electrical Engineering Ulsan National Institute of Science and Technology Korea Republic of

In this study, a cooperative monitoring task for multiple anti-aircraft targets is investigated using multiple unmanned aerial vehicles (UAVs) equipped with stereo vision sensors. To accomplish this task, these UAVs must cooperate with other UAVs within a three-dimensional (3D) space to track multiple targets and avoid collisions. To address this challenge, we propose a cooperative multi-agent reinforcement learning (MARL) scheme that can make intelligent flight decisions to enable multiple UAVs to perform cooperative surveillance tasks. The main contributions of this study are as follows. First, to the best of our knowledge, this study is the first attempt to address aerial multi-target surveillance using multiple UAVs via MARL in 3D space. Second, we adopt a hybrid approach that integrates low-level rule-based controllers and high-level control policies to enable agents to learn the high-level goals set through reinforcement learning. © ICROS 2024.

关键词： Reinforcement learning

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Numerical Investigations on Fluid Flow and Heat Transfer Characteristics of an Ultra-Thin Heat Pipe with Separated Wick Structures

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Frontiers in Heat and Mass Transfer 2024年第3期22卷 869-887页

作者： Yasushi Koito Akira Fukushima Division of Industrial Fundamentals Faculty of Advanced Science and TechnologyKumamoto UniversityKumamoto860-8555Japan Department of Mechanical and Mathematical Engineering Graduate School of Science and TechnologyKumamoto UniversityKumamoto860-8555Japan

Thermal and fluid-flow characteristics were numerically analyzed for ultra-thin heat *** studies have been conducted for ultra-thin heat pipes with a centered wick structure,but this study focused on separated wick structures to increase the evaporation/condensation surface areas within the heat pipe and to reduce the concentration of heat flux within the wick structure.A mathematical heat-pipe model was made in the threedimensional coordinate system,and the model consisted of three regions:a vapor channel,liquid-wick,and container wall *** conservation equations for mass,momentum,and energy were solved numerically with boundary conditions by using a code developed by one of the *** numerical results with the separated wick structures were compared with those with the centered,which confirmed the effectiveness of the separation of the wick ***,the effectiveness of the separation was affected by the position of the separated wick structure.A simple equation was presented to determine the optimum position of the separated wick *** analyses were also conducted when the width of the heat pipe was increased with the cooled section,which clarified that the increase in the cooled-section width with the addition of wick structures wasmore effective than the increase in the cooled-section length.A 44%reduction in the total temperature difference of the heat pipe was obtained under the present numerical ***,a comparison wasmade between experimental results and numerical results.

关键词： Ultra-thin heat pipe vapor chamber heat transfer surface CFD thermal design

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Experimental Analyses of Flow Pattern and Heat Transfer in a Horizontally Oriented Polymer Pulsating Heat Pipe withMerged Liquid Slugs

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Frontiers in Heat and Mass Transfer 2024年第5期22卷 1381-1397页

作者： Zhengyuan Pei Yasushi Koito Department of Mechanical and Mathematical Engineering Graduate School of Science and TechnologyKumamoto UniversityKumamoto860-8555Japan Division of Industrial Fundamentals Faculty of Advanced Science and TechnologyKumamoto UniversityKumamoto860-8555Japan

Extended experiments were conducted on the oscillation characteristics of merged liquid slugs in a horizontally oriented polymer pulsating heat pipe(PHP).The PHP’s serpentine channel comprised 14 parallel channels with a width of 1.3 mm and a height of 1.1 *** evaporator and condenser sections were 25 and 50 mm long,respectively,and the adiabatic section in between was *** a plastic 3D printer and semi-transparent filament made from acrylonitrile butadiene styrene,the serpentine channel was printed directly onto a thin polycarbonate sheet to form the *** PHP was charged with *** the experiments,the evaporator section was heated,and the condenser section was cooled using high-temperature and low-temperature thermostatic baths,*** patterns of the working fluid were obtained with temperature distributions of the PHP.A mathematical model was developed to analyze the flow *** liquid slugs were observed in every two channels,and their oscillation characteristics were found to be approximately the same in time and *** was also found that the oscillations of the merged liquid slugs became slower,but the heat transfer rate of the PHP increased with a decrease in the filling ratio of the working *** is because vapor condensation was enhanced in vapor plugs as the filling ratio ***,the filling ratio had a lower limit,and the heat transfer rate was maximum when the filling ratio was 40.6%in the present experimental range.

关键词： Pulsating heat pipe polymer heat pipe visualization experiment flow pattern analysis heat transfer enhancement

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Predictive Vehicle Control at Intersections with Look-Ahead Driving Approach

Predictive Vehicle Control at Intersections with Look-Ahead ...

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2025 SICE International Symposium on Control systems, SICE ISCS 2025

作者： Magzhan, Atykhan Hossain, Md Delowar Bakibillah, A.S.M. Kamal, Md Abdus Samad Yamada, Kou Graduate School of Science and Technology Gunma University Kiryu Japan Institute of Science Tokyo Department of Systems and Control Engineering Tokyo Japan

ISBN: (纸本)9784907764852

This paper presents a look-ahead vehicle control scheme for efficient traffic management at signalized intersections. The proposed scheme predicts future driving states with a look-ahead approach as an extended adaptive cruise control (ACC) model. It maintains car-following behavior similar to human driving while predicting future states of traffic flow to minimize intersection clearing time and aggressive braking independently, similar to model predictive control (MPC) approaches. In contrast to MPC models that are computationally demanding and have limited practical applications due to real-time constraints, the proposed scheme uses a modified Intelligent Driver Model (IDM) with predictive adjustments. The efficiency of the control scheme is evaluated through simulations with multiple vehicles in intersection traffic scenarios, focusing on maintaining safe time headway within a traffic flow and ensuring efficient flows with higher intersection throughput. Comparative results indicate improvements in intersection clearance, human-like vehicle headway management, and enhanced traffic flow performance. © 2025 The Society of Instrument and Control Engineers.

关键词： Adaptive cruise control

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Flow Patterns and Heat Transfer Characteristics of a Polymer Pulsating Heat Pipe Filled with Hydrofluoroether

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Frontiers in Heat and Mass Transfer 2024年第1期22卷 49-63页

作者： Nobuhito Nagasato Zhengyuan Pei Yasushi Koito Department of Mechanical and Mathematical Engineering Graduate School of Science and TechnologyKumamoto UniversityKumamoto860-8555Japan Division of Industrial Fundamentals Faculty of Advanced Science and TechnologyKumamoto UniversityKumamoto860-8555Japan

Visualization experiments were conducted to clarify the operational characteristics of a polymer pulsating heat pipe(PHP).Hydrofluoroether(HFE)-7100 was used as a working fluid,and its filling ratio was 50%of the entire PHP channel.A semi-transparent PHP was fabricated using a transparent polycarbonate sheet and a plastic 3D printer,and the movements of liquid slugs and vapor plugs of the working fluid were captured with a high-speed *** video images were then analyzed to obtain the flow patterns in the *** heat transfer characteristics of the PHPwere discussed based on the flowpatterns and temperature distributions obtainedwith *** starting heating,because of high wettability,large liquid slugs positioned at the evaporator section of the *** starting heating,since the occurrence of boiling divided the large liquid slugs,oscillatory flowof smaller liquid slugs and vapor plugs was found in the *** circulation flow of liquid slugs and vapor plugs was observed when the power input to the PHP was larger than 12.0 *** flow patterns and temperature distributions confirmed that the circulation flow enhanced the heat transfer from the evaporator section to the condenser section of the *** the circulation flow mode,large growth and contraction of vapor plugs were found one after another in all even-numbered PHP ***,the analysis of flow patterns clarified that the phase-change heat transfer rate by large growth and contraction of vapor plugs was 19%of the total heat transfer rate of the *** the generation of large vapor plugs was found in the PHP,most of the heat was transferred by the sensible heat of the working fluid.

关键词： Polymer heat pipe visualization oscillatory flow circulation flow thermal management 3D printer

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