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23rd International Symposium on Communications and Information Technologies, ISCIT 2024

作者： Laosunthara, Ampan Leelawat, Natt Ohashi, Takumi Sararit, Titaya Srivichai, Mongkonkorn Tang, Jing School of Environment and Society Tokyo Institute of Technology Tokyo Japan Chulalongkorn University Faculty of Engineering Department of Industrial Engineering Bangkok Thailand Chulalongkorn University Disaster and Risk Management Information Systems Research Unit Bangkok Thailand Graduate School of System Design and Management Keio University Kanagawa Japan Tokyo Institute of Technology Department of Transdisciplinary Science and Engineering Tokyo Japan Chiangmai University Faculty of Architecture Chiangmai Thailand Rajamangala University of Technology Lanna Faculty of Engineering Department of Civil Engineering Chiangrai Thailand International School of Engineering Chulakongkorn University Faculty of Engineering Bangkok Thailand

ISBN: (纸本)9798350353952

Enhancing disaster awareness and preparedness is crucial for building resilient societies. This study comprehensively assessed the levels of disaster awareness and preparedness among children and adults in Thailand through qualitative and quantitative surveys. Children strongly emphasized the importance of disaster education in school curricula, leveraging multimedia channels for risk communication, and implementing early warning systems. In contrast, adults exhibited a greater understanding of the significance of business continuity and disaster management technologies. These findings revealed disparities in disaster awareness across age groups. The insights from this study suggest age-specific engineering system approaches to information dissemination, contributing to the development of inclusive disaster preparedness strategies that incorporate diverse stakeholder perspectives. Children highlighted the need for practical training on survival skills, accessible disaster communication through SMS alerts, and monitoring systems for timely information dissemination. Adults, on the other hand, placed greater importance on business continuity planning and recognized the usefulness of technologies like satellite imagery for disaster management. By identifying these gaps and areas for improvement, this research provides valuable guidance for tailoring interventions, fostering a culture of preparedness, and harnessing technological solutions that resonate with the needs and concerns of different age cohorts within Thai society. © 2024 IEEE.

关键词： Satellite imagery

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Positioning Control for Voice Coil Motor Using Unbalanced Multilevel Inverter Topology

Positioning Control for Voice Coil Motor Using Unbalanced Mu...

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International Conference on Mechatronics (ICM)

作者： Gaku Takei Hidemine Obara Ryo Haneda Takahiro Nozaki Graduate School of Science and Technology Keio University Yokohama Japan Department of Physics Electrical and Computer Engineering Yokohama National University Yokohama Japan Department of System Design Engineering Keio University Yokohama Japan

ISBN: (数字)9798331533892

ISBN: (纸本)9798331533908

This article proposes a new multi-level inverter (MLI) based on flying capacitor inverter (FCI), with focused on high-precision positioning control for a voice coil motor (VCM). Multi-level inverters (MLIs) have the characteristic that increasing the number of output voltage levels reduces the output voltage error. However, as the number of levels increases, the number of circuit elements increases, and the circuit becomes more complex. In addition, the output voltage amplitude for each level is constant in conventional inverters. As a result, such as high-precision positioning control of VCM, designing an appropriate inverter for a reference wave that contains a large amount of low-voltage components increases the number of circuit elements. Therefore, this paper proposes a MLI with two unbalanced dc-input voltages, referred to as unbalanced MLIs (UMLIs) hereinafter. This topology uses two different dc-input voltages, and it is possible to reduce the output voltage level in extremely low-voltage range compared to other voltage levels. Simulation results when the high-precision positioning control of the VCM confirm that the proposed UMLIs improves the control performance compared to the conventional FCIs with equal number of output voltage levels and uniform level widths.

关键词： Coils Low voltage Simulation Switches Multilevel inverters Motors Topology Sensors Voltage control Motion control

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design of Pelton Turbine Test Stand in Plateau Environment 4

Design of Pelton Turbine Test Stand in Plateau Environment

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4th IAHR Asian Working Group Symposium on Hydraulic Machinery and systems

作者： Cai, Jinhan Zhou, Xuejun Luo, Hongying Wang, Zhengwei Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China College of Mechanical Engineering Tianjin Sino-German University of Applied Science No. 2 Yashen Road Tianjin China College of Hydraulic and Civil Engineering Tibet Agricultural and Animal Husbandry University China Department of Energy and Power Engineering Tsinghua University China

In recent years, with the continuous development of China's hydropower projects, Pelton turbines are gradually being valued, and the focus of development has shifted from plain areas to plateau areas. Environmental impacts such as high altitude, water temperature, and high sediment content in the plateau area have caused serious interference to equipment that originally worked in a stable environment, for example, the failure of the cooperation between the parts of the turbine and the mutual seizure, the increased wear of the nozzle needle, the decrease of the flow rate and the water outlet speed of the nozzle, and the decrease of the air pressure in the plateau environment lead to the change of the flow state of the nozzle. In view of the above problems, this paper puts forward the design scheme of impulse turbine test-bed, using the method of changing specific speed to determine the basic parameters of impulse turbine unit, so as to eliminate the influence of plateau environment on the normal operation of turbine, obtain the efficiency condition of model experiment under low ambient pressure, and improve the operation efficiency and reliability of turbine unit. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Nozzles

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Analytical framework for liquid hydrogen storage tanks in UAVs: Thermal performance validation and structural integrity assessment

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International Journal of Hydrogen Energy 2025年 145卷 223-236页

作者： Heo, Jinmyeong Cho, Nak-Kyun Huh, Nam-Su Lee, Seung-gun Kim, Do Kyun Department of Manufacturing Systems and Design Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of Department of Mechanical System Design Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of Hydrogen Materials Research Center Korea Institute of Materials Science Changwon51508 Korea Republic of Department of Naval Architecture and Ocean Engineering Seoul National University Seoul08826 Korea Republic of Research Institute of Marine Systems Engineering Seoul National University Seoul08826 Korea Republic of

The aviation industry faces increasing pressure to transition to environmentally friendly propulsion systems, with hydrogen emerging as a promising solution for unmanned aerial vehicles (UAVs). This study presents a comprehensive analytical framework integrating thermal, structural, fatigue, and impact analyses to evaluate liquid hydrogen storage tanks for UAV applications, addressing the complex challenges in maintaining both thermal performance and structural integrity under demanding operational conditions. Experimental material characterization at cryogenic temperatures was conducted using a 100 kN tensile-fatigue testing system to obtain temperature-dependent properties of SUS316L and Al6061-T6. These properties were incorporated into comprehensive finite element analyses encompassing thermal, structural, fatigue, and drop impact assessments. Thermal analysis validated with experimental testing demonstrated that vapor-cooled shield (VCS) implementation effectively reduced boil-off rate (BOR) by approximately 15 % in small-capacity storage tank. Structural analysis identified critical stress concentration regions under UAV-specific operational loading conditions, demonstrating how this evaluation approach can guide design optimizations to address potential structural vulnerabilities during flight operations. Fatigue analysis confirmed infinite life expectancy exceeding ISO 21029-1 requirements, while drop impact analysis using an ABAQUS user subroutine VUSDFLD - based element deletion approach identified vulnerable components requiring design optimization. This integrated analytical framework establishes new standards for comprehensive safety assessment of liquid hydrogen storage systems in UAV applications, while highlighting the critical balance between thermal isolation requirements and structural integrity demands during flight operations. © 2025 Hydrogen Energy Publications LLC

关键词： Structural dynamics

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Robust Containment Control of Uncertain Multi-Agent systems Subject to Transmission Delays

Robust Containment Control of Uncertain Multi-Agent Systems ...

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Chinese Control Conference (CCC)

作者： Cong Bi Xiang Xu College of Artificial Intelligence Nankai University Tianjin China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen Guangdong Province China

This paper investigates the robust containment control problem of uncertain heterogeneous linear multi-agent systems with unbounded transmission delays under some mild assumptions. A novel distributed output feedback control strategy is proposed based on the distributed observer approach and the internal model principle. It is shown that under the proposed control strategy, the output of each follower converges to the convex hull spanned by the outputs of the leaders and the concerned time delayed system is analyzed by the Lyapunov-Krasovskii functional method. A simulation example is provided to show the effectiveness of the proposed controller.

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Adaptive Containment Control of Heterogeneous Multi-Agent systems with Unknown Leaders and Communication Delays

Adaptive Containment Control of Heterogeneous Multi-Agent Sy...

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IEEE International Conference on systems, Man and Cybernetics

作者： Cong Bi Xiang Xu The College of Artificial Intelligence Nankai University Tianjin China the School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen Guangdong Province China

This paper investigates the containment control problem of heterogeneous linear multi-agent systems with nonuniform bounded distributed communication delays under an assumption that only the neighboring agents of multiple leaders have access to the information on both the system matrices and the states of multiple leaders. Adaptive distributed observers under nonuniform distributed communication delays are proposed to estimate both the system matrices and the states of multiple leaders without the prior knowledge of communication delays. Then a novel distributed output feedback control strategy is proposed based on the adaptive distributed observer. It is shown that under the proposed control strategy, the output of each follower converges to the convex hull spanned by the outputs of the leaders.

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A Network Gain Theorem for Interconnected systems

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IFAC-PapersOnLine 2023年第2期56卷 3868-3873页

作者： DamiÃ¡n Marelli Minyue Fu School of Automation Guangdong University of Technology Guangzhou 510006 China French-Argentinean International Center for Information and Systems Sciences National Scientific and Technical Research Council Rosario 2000 Argentina School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China

This paper provides general network gain conditions for the input-to-state (ISS) stability of an interconnected nonlinear system. The result generalizes the well-known small-gain theorem for a single-loop system to networked systems under very general assumptions on individual sub-systems. The work also generalizes the previously known matrix small-gain theorem and cyclic small-gain theorem for networked systems.

关键词： Networked control systems stability analysis nonlinear control systems vector Lyapunov function

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Research on acceptable luminance contrast between the window and the surrounding wALL (Part 1): Examination of windows installed at waist height including blinds

Journal of Environmental Engineering (Japan)

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Journal of Environmental Engineering (Japan) 2021年第790期86卷 883-891页

作者： Kato, Mika Yoshizawa, Nozomu Yamaguchi, Hideki Miki, Yasuhiro Dept. of Conceptual Design College of Industrial Technology Nihon University Japan Dept. of Architecture Faculty of Science and Technology Tokyo University of Science Japan Building Dept. National Institute for Land and Infrastructure Management Japan Research Coordinator for Housing Information System Housing Dept. National Institute for Land and Infrastructure Management Japan

This study proposes a method for controlling the brightness contrast between the window and the surrounding walls. Daylight is not always good, especially in the visual environment, it is very difficult to adjust and requires proper control. Experiments are conducted in full-scale space, and the main variables are interior reflectance, blind slat width and angle. Based on the experimental results, the formula "75% AIL "was proposed. The equation includes the brightness of the window and the internal reflectance. By using this relationship, it is possible to control the window luminance and the output of artificial lighting. © 2021 Architectural Institute of Japan. All rights reserved.

关键词： Lighting

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A Battery-input Hysteretic Buck Converter with 430nA Quiescent Current and 5×104 Load Current Dynamic Range for Wearable Biomedical Devices

A Battery-input Hysteretic Buck Converter with 430nA Quiesce...

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IEEE Biomedical Circuits and systems (BIOCAS)

作者： Ziming Liu Wang Ling Goh Liter Siek Yuan Gao School of Electrical and Electronic Engineering Nanyang Technological University Singapore IC Design and System Department Institute of Microelectronic Agency for Science Technology and Research (A*STAR) Singapore

This paper presents a battery-input hysteretic buck converter with 430nA quiescent current for wearable biomedical devices. The converter input range is 2.5–4.2 V for rechargeable Li-ion battery and the output is fixed at 1.2 V. To reduce the quiescent power consumption and enhance the power efficiency at light load condition, the PFM controlled buck converter employs a hysteretic comparator with dynamic biasing circuit to reduce the current consumption during idle state. A delay compensation circuit is optimized for the comparator in zero current detector (ZCD) to maximize the overall power efficiency. This converter is implemented in a standard 55nm CMOS BCDLITE process with active circuit area of 0.8mm×0.8mm. Postlayout simulations show the circuit can achieve 5×10 4 load current dynamic range in 2 μA– 100 mA, and higher than 85% efficiency is maintained between 10 μA and 100mA with a peak efficiency of 88.6%.

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Study on natural circulation flow instabilities in rod bundle channel under rolling condition

Study on natural circulation flow instabilities in rod bundl...

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2020 International Conference on Nuclear Engineering, ICONE 2020, collocated with the ASME 2020 Power Conference

作者： Cheng, Kun Deng, Jian Cai, Rong Qian, Libo Qi, Peiyao Ke, Bingzheng Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Heilongjiang150001 China

ISBN: (纸本)9780791883785

The effects of rolling condition on the flow instability characteristics of natural circulation (NC) in rod bundle channel were experimentally studied. A 3×3 rod bundle channel is used as the testing section. The experimental system pressure range is 0.2 to 0.6 MPa, and the range of inlet subcooling is 10 to 70°C. The ranges of rolling motion amplitude and period are 10 ∼ 20° and 10 ∼ 30s, respectively. Two typical two-phase flow instabilities in rod bundle channel under rolling condition were found in experiments: (a) the trough-type oscillation caused by the vapor generation at the minimum point of flow fluctuation and (b) the compound oscillation formed by the superposition of the trough-type oscillation and DWOI. Experimental results show that the rolling motion can reduce the threshold heating power of trough-type oscillation and cause the occurrence of NC flow instability in advance. But the rolling motion cannot affect the dimensionless boundary of DWOI in rod bundle channel. © 2020 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Two phase flow

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