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35th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2024

作者： Furuta, Makitaro Kimura, Tatsuaki Takine, Tetsuya Osaka University Graduate School of Engineering Department of Information and Communications Technology Japan Doshisha University Faculty of Science and Engineering Department of Information Systems Design Japan

ISBN: (纸本)9798350362244

Aerial base stations (ABSs), i.e., unmanned aerial vehicle-mounted base stations, have emerged as an essential technology to expand the coverage and capacity in next-generation wireless networks. Determining the optimal ABS placement that maximizes the communication quality of users is a critical but challenging problem due to complex air-to-ground (A2G) channel characteristics and inter-cell interference. Although various ABS deployment methods have been proposed, existing methods do not consider the actual line-of-sight (LoS) and non-LoS (NLoS) conditions of A2G channels properly, assuming a spatially independent probabilistic LoS model to simplify the problem and analysis. In this study, we propose a distributed ABS deployment method considering the actual LoS/NLoS conditions. We model the ABS deployment space as a 3D grid space in which the LoS/NLoS condition between each grid point is given and formulate the ABS deployment problem as the maximization problem of the expected number of covered users. By applying a potential game to the problem, we develop a distributed ABS deployment algorithm that probabilistically converges to a Nash equilibrium that maximizes the objective function. Furthermore, we demonstrate through simulation that the proposed method can improve the actual communication quality of users. © 2024 IEEE.

关键词： Unmanned aerial vehicles (UAV)

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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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Partial Information Defense Game with an Active Target 1

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7th Chinese Conference on Swarm Intelligence and Cooperative control, CCSICC 2023

作者： He, Qiyong Li, Xiuxian Meng, Min Liu, Shuai Department of Control Science and Engineering College of Electronics and Information Engineering and the Shanghai Research Institute for Intelligent Autonomous Systems Tongji University Shanghai201800 China School of Control Science and Engineering Shandong University Jinan250061 China

ISBN: (数字)9789819733248

ISBN: (纸本)9789819733231

This paper studies the partial information defense game with an active target. This type of game considers the influence of both sensing limitation and the moving target, which are common in the real-world conditions. Compared with the stationary target scenario, the defender has more flexibility to capture the intruder when the target is active. Inspired by previous works, we separate the game into four phases and obtain optimal strategies for all agents in each phase, respectively. The lower bound of defender’s winning probability is obtained under some mild assumptions, which is higher than that in the stationary target scenario. An illustrative example is presented to demonstrate the efficacy of the theoretical results. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： active target partial information pursuit-evasion game

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Advancing Al-doped ZnO thin films structural,optical and electrical properties of low temperature PET substrates via flash lamp annealing

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Journal of Semiconductors 2024年第12期45卷 47-60页

作者： Juwon Lee Chang-Hyeon Jo Gwangseop Lee Min-Sung Bae Slawomir Prucnal Shengqiang Zhou Muhammad Zubair Khan Osama Gohar Mohsin Saleem Jung-Hyuk Koh Graduate School of Intelligent Energy and Industry Chung-Ang UniversityHeukseok-roSeoulRepublic of Korea School of Electrical and Electronic Engineering Chung-Ang UniversitySeoulRepublic of Korea Helmholtz-Zentrum Dresden-Rossendorf Institute of Ion Beam Physics and Materials ResearchBautzner Landstraße 40001328DresdenGermany Department of Materials Science and Engineering Pak-Austria Fachhochschule:Institute of Applied Sciences and TechnologyMangHaripur22621Khyber PakhtunkhwaPakistan Department of Mechanical and Electrical Systems Engineering Graduate School of EngineeringKyoto University of Advanced ScienceGotanda-choYamanouchiUkyo-kuKyoto 615-8577Japan School of Chemical and Materials Engineering(SCME) National University of Sciences&Technology(NUST)H-12Islamabad 44000Pakistan

In this study, aluminum-doped zinc oxide(AZO) thin films were deposited onto a low-temperature polyethylene terephthalate(PET) substrate using DC magnetron sputtering. Deposition parameters included power range of 100-300 W, a working pressure of 15 mTorr, and a substrate temperature of 50 ℃. Post-deposition, flash lamp annealing(FLA) was employed as a rapid thermal processing method with a pulse duration of 1.7 ms and energy density of 7 J·cm-2, aimed at enhancing the film's quality while preserving the temperature-sensitive PET substrate. FLA offers advantages over conventional annealing,including shorter processing times and improved material properties. The structural, optical, and electrical characteristics of the AZO films were assessed using X-ray diffraction, field emission scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, ultraviolet-visible spectroscopy, and Hall effect measurements. The results demonstrated that properties of AZO films varied with deposition and annealing conditions. Films deposited at 200 W and subjected to FLA exhibited superior crystallinity, with average visible light transmittance exceeding 80% and resistivity as low as 0.38 Ω·cm representing 95%improvement in transmittance. Electrical analysis revealed that carrier concentration, mobility, and resistivity were influenced by both sputtering and annealing parameters. These findings underscore the effectiveness of FLA in optimizing AZO thin film properties, highlighting potential in optoelectronics applications.

关键词： flash lamp annealing AZO thin film PET sputtering

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RIM Experiment on Fuel Adhesion Characteristics of Inclined-Wall-Impinging Spray under Cross-Flow Conditions 10

RIM Experiment on Fuel Adhesion Characteristics of Inclined-...

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10th International Conference on Modeling and Diagnostics for advanced Engine systems, COMODIA 2022

作者： Zhang, Gengxin Shi, Penghua Luo, Hongliang Ogata, Yoichi Nishida, Keiya Department of Mechanical Systems Engineering Graduate School of Engineering University of Hiroshima Japan Mechanical Engineering Program Graduate School of Advanced Science and Engineering University of Hiroshima Japan

The impingement of fuel sprays on the piston surface significantly affects mixture formation, combustion performance, and pollutant emissions in Direct-Injection Spark-Ignition (DISI) engines. To better understand the fuel adhesion behavior, the fuel adhesion characteristics of fuel spray impinging on the flat wall under cross-flow condition were investigated in this work. Refractive Index Matching (RIM) were employed to observe the propagation of fuel adhesion. Then the area, mass, and thickness of fuel adhesion were evaluated under various cross-flow velocities. Also, the propagation mechanism and lifetime prediction of fuel adhesion under the cross-flow conditions were revealed. The experimental results can provide necessary guidance on the operating conditions of airflow inside the engine. © 2022 by the Japan Society of Mechanical Engineers All rights reserved.

关键词： Adhesion

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Elliptical vibration chiseling:a novel process for texturing ultra-high-aspect-ratio microstructures on the metallic surface

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International Journal of Extreme Manufacturing 2024年第2期6卷 449-467页

作者： Zhiwei Li Jianfu Zhang Zhongpeng Zheng Pingfa Feng Dingwen Yu Jianjian Wang State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China Beijing Key Laboratory of Precision/Ultra-precision Manufacturing Equipments and Control Department of Mechanical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China Division of Advanced Manufacturing Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China

High-aspect-ratio metallic surface microstructures are increasingly demanded in breakthrough applications,such as high-performance heat transfer enhancement and surface plasmon ***,the fast and cost-effective fabrication of high-aspect-ratio microstructures on metallic surfaces remains challenging for existing *** study proposes a novel cutting-based process,namely elliptical vibration chiseling(EV-chiseling),for the high-efficiency texturing of surface microstructures with an ultrahigh aspect *** conventional cutting,EV-chiseling superimposes a microscale EV on a backward-moving *** tool chisels into the material in each vibration cycle to generate an upright chip with a high aspect ratio through material *** to the tool’s backward movement,the chip is left on the material surface to form a microstructure rather than falling *** one microstructure is generated in one vibration cycle,the process can be highly efficient using ultrafast(>1 kHz)tool vibration.A finite element analysis model is established to explore the process mechanics of ***,a mechanistic model of the microstructured surface generation is developed to describe the microstructures’aspect ratio dependency on the process ***,surface texturing tests are performed on copper to verify the efficacy of *** micro ribs with a spacing of 1–10μm and an aspect ratio of 2–5 have been successfully textured on *** with the conventional EV-cutting that uses a forward-moving tool,EV-chiseling can improve the aspect ratio of textured microstructure by up to 40 *** experimental results also verify the accuracy of the developed surface generation model of ***,the effects of elliptical trajectory,depth of cut,tool shape,and tool edge radius on the surface generation of micro ribs have been discussed.

关键词： metallic microstructure high aspect ratio backward-moving cutting vibration cutting chiseling material deformation

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Understanding preferences for autonomous trucks functions in China: Insights from drivers and organizational buyers

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Transport Policy 2025年 170卷 110-119页

作者： Fu, Hanlong Fu, Xiaowen Ye, Shi Wang, Kun Chen, Tiantian Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong Behaviour and Knowledge Engineering Research Centre Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Cho Chun Shik Graduate School of Mobility Korea Advanced Institute of Science and Technology Korea Republic of Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

The transportation industry is undergoing a significant transformation as it integrates advanced driver assistance systems (ADAS) technologies. This shift is particularly important in the trucking industry. Driver assistance technologies offer a promising solution for improving safety and reducing traffic accidents. However, the trucking industry lags significantly behind passenger vehicles in the maturity and penetration rate of such technologies. This study uses a stated preference survey to explore the purchasing preferences for ADAS functions among truck drivers and organization buyers in China. Our findings show that truck drivers with a safe driving history prioritize reliability and assistance features such as automatic emergency braking, adaptive cruise control, and lane-centering control. In contrast, drivers with a record of unsafe driving favor more advanced ADAS functions, such as city or highway navigation on autopilot, owing to their ability to alleviate driving stress. Buyers from organizations, compared with individual truck drivers, are more averse to the additional costs of ADAS technologies, while larger companies seem more willing to invest in autonomous trucks than are smaller businesses and individuals. However, top management teams remain cautious, reflecting a lack of confidence in the operational and safety benefits of the current technology at Level 2 autonomy. Resistance to adopting autonomous trucks is also stronger among male (vs. female) drivers and older drivers, who comprise a large segment of the domestic market. The study recommends that autonomous vehicle system providers and governments prioritize active safety functions to further improve safety. Furthermore, it is suggested that extensive training and trials be provided to increase trust and confidence in autonomous truck technologies among industry stakeholders. © 2025 Elsevier Ltd

关键词： Highway accidents

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Closer through commonality: Enhancing hypergraph contrastive learning with shared groups

Closer through commonality: Enhancing hypergraph contrastive...

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2024 IEEE International Conference on Big Data, BigData 2024

作者： Roh, Daeyoung Han, Donghee Kim, Daehee Han, Keejun Yi, Mun Kaist Graduate School of Data Science Korea Republic of Hansung University School of Computer Engineering Korea Republic of Kaist Department of Industrial and Systems Engineering Korea Republic of

ISBN: (纸本)9798350362480

Hypergraphs provide a superior modeling frame-work for representing complex multidimensional relationships in the context of real-world interactions that often occur in groups, overcoming the limitations of traditional homogeneous graphs. However, there have been few studies on hypergraph-based contrastive learning, and existing graph-based contrastive learning methods have not been able to fully exploit the high-order correlation information in hypergraphs. Here, we propose a Hypergraph Fine-grained contrastive learning (HyFi) method designed to exploit the complex high-dimensional information inherent in hypergraphs. While avoiding traditional graph augmentation methods that corrupt the hypergraph topology, the proposed method provides a simple and efficient learning augmentation function by adding noise to node features. Furthermore, we expands beyond the traditional dichotomous relationship between positive and negative samples in contrastive learning by introducing a new relationship of weak positives. It demonstrates the importance of fine-graining positive samples in contrastive learning. Therefore, HyFi is able to produce high-quality embeddings, and outperforms both supervised and unsupervised baselines in average rank on node classification across 10 datasets. Our approach effectively exploits high-dimensional hypergraph information, shows significant improvement over existing graph-based contrastive learning methods, and is efficient in terms of training speed and GPU memory cost. The source code is available at https://***/Noverse0/***. © 2024 IEEE.

关键词： Contrastive Learning

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Tsunami Visualization Tool Using Numerical Simulation Utilizing 3D City Model 13

Tsunami Visualization Tool Using Numerical Simulation Utiliz...

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Joint 13th International Conference on Soft Computing and Intelligent systems and 25th International Symposium on advanced Intelligent systems, SCIS and ISIS 2024

作者： Oshida, Ryutaro Sasaki, Kano Ota, Takao Emoto, Hisao Fukui, Nobuki Graduate School of Sustainability Science Tottori University Tottori Japan Tottori University Faculty of Engineering Department of Social Systems and Civil Engineering Tottori Japan

ISBN: (纸本)9798350373332

After the Noto Peninsula earthquake on January 1, 2024, the importance for residents on the Sea of Japan coast to have a correct understanding of the tsunami hazard is growing. One of the training tools for enhancing tsunami awareness is a tsunami visualization using Virtual Reality (VR). In this study, we create a VR space around Asahi-machi, Sakai-minato City using 3D City Model of PLATEAU, and develop a tsunami evacuation training tool by creating inundation scenarios in the VR space using the results of tsunami inundation simulations with the JAGURS tsunami model. © 2024 IEEE.

关键词： Digital elevation model

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An adaptive large neighborhood search for the multi-point dynamic aggregation problem

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control Theory and Technology 2024年第3期22卷 360-378页

作者： Shengyu Lu Bin Xin Jie Chen Miao Guo School of Automation Beijing Institute of TechnologyBeijing 100081China National Key Lab of Autonomous Intelligent Unmanned Systems Beijing 100081China Department of Control Science and Engineering Tongji UniversityShanghai 201804China

The multi-point dynamic aggregation(MPDA)problem is a challenging real-world *** the MPDA problem,the demands of tasks keep changing with their inherent incremental rates,while a heterogeneous robot fleet is required to travel between these tasks to change the time-varying state of each *** robots are allowed to collaborate on the same task or work separately until all tasks are *** is challenging to generate an effective task execution plan due to the tight coupling between robots abilities and tasks'incremental rates,and the complexity of robot *** effectiveness consideration,we use the variable length encoding to avoid redundancy in the solution *** creatively use the adaptive large neighborhood search(ALNS)framework to solve the MPDA *** the proposed algorithm,high-quality initial solutions are generated through multiple problem-specific solution construction *** heuristics are also used to fix the broken solution in the novel integrated decoding-construction repair process of the ALNS *** results of statistical analysis by the Wilcoxon rank-sum test demonstrate that the proposed ALNS can obtain better task execution plans than some state-of-the-art algorithms in most MPDA instances.

关键词： Adaptive large neighborhood search(ALNS) Multi-point dynamic aggregation(MPDA) Heuristic solution construction Multi-robot collaboration

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