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IEEE Journal on Miniaturization for Air and Space systems 2024年第2期6卷 1-1页

作者： Sun, Wentao Li, Zan Shi, Jia Bai, Zixuan Wang, Feng Quek, Tony Q. S. School of Telecommunications Engineering State Key Laboratory of Integrated ServiceNetworks Xidian University Xi’an China Information System Technology and Design Pillar University of Technology and Design Singapore

As an aerial base station (BS), unmanned aerial vehicle (UAV) has been considered as a promising platform to provide wireless data service in future networks due to its flexible, swift and low cost features. However, since the suddenness and randomness of ground users’ (GUs’) data requirements, it is challenging for the UAV BSs to dynamically make decisions to provide real-time data services to GUs. In a multi-mode UAV-assisted wireless network, we formulate a multi-objective optimization problem to minimize the average peak age of information (APAoI) and energy consumption of UAVs, and to maximize the accumulated service data (ASD) for GUs. Therefore, this paper proposes the multi-agent hybrid twin delayed deep deterministic policy gradient (MAHTDDDPG) algorithm with hybrid action space design, which is empowered by centralized training and distributed execution (CTDE) framework. In the proposed algorithm, the UAVs can cooperatively make decisions by sharing the GU status information, in a result of jointly optimizing the UAV trajectory, mode selection and transmit power. Simulation results demonstrate that our proposed approach achieves 79.6% and 120.4% higher reward than MADDPG algorithm and HTD-DDPG algorithm respectively. IEEE

关键词： Heuristic algorithms

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Numerical study on ignition start-up process of an underwater solid rocket motor across a wide depth range

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Chinese Journal of Aeronautics 2024年第10期37卷 136-157页

作者： Deyou WANG Shipeng LI Ge JIN Ruyao WANG Dian GUAN Ningfei WANG School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Beijing System Design Institute of Electro-mechanic Engineering Beijing 100854China

Solid rocket motors have important applications in the propulsion of trans-media vehicles and underwater launched *** this paper,the ignition start-up process of an underwater solid rocket motor across a wide depth range has been numerically studied.A novel multi-domain integrated model has been developed by combining the solid propellant ignition and combustion model with the volume of fluid multiphase *** integrated model enables the coupled simulation of the propellant combustion and gas flow inside the motor,along with the gas jet evolution in the external water *** detailed flow field developments in the combustion chamber,nozzle,and wake field are carefully *** variation rules of the internal ballistics and thrust performance are also *** effects of environmental medium and operating depth on the ignition start-up process are systematically *** results show that the influence of the operating environment on the internal ballistic characteristics is primarily reflected in the initial period after the nozzle closure *** development of the gas jet in water lags significantly compared with that in *** the water depth increases,the ignition delay time of the motor is shortened,and the morphology evolution of the gas jet is significantly compressed and ***,the necking and bulging of the jet boundary near the nozzle outlet and the consequent shock oscillations are intensified,resulting in stronger fluctuations in the wake pressure field and motor thrust.

关键词： Underwater propulsion Solid rocket motor Ignition start-up process Underwater gas jet Thrust oscillation

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Development of a Gap Time Detection and Exercise Support App Aimed at Improving Physical Inactivity 13

Development of a Gap Time Detection and Exercise Support App...

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13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Takahashi, Yuuto Matsui, Kanae Tsukumi, Takane Mori, Eiji Tokyo Denki University Graduate School of System Design and Technology Tokyo Japan Tokyo Denki University Expolis. Llc Graduate School of System Design and Technology Tokyo Japan Tokyo Denki University School of System Design and Technology Tokyo Japan

ISBN: (纸本)9798350355079

In this study, we proposed an Android based smartphone application to support the formation of exercise habits for people who cannot secure sufficient time for exercise. In this application, users input their schedules, and the app calculates and notifies them of potential gap times, providing an opportunity for exercise. Additionally, we provided short training videos suitable for brief periods. Furthermore, we made it possible to record and view the exercises performed and the gap times used, aiming to give users a sense of satisfaction and achievement. We implemented this application on smartphones and conducted a 14-day proof-of-concept experiment. Through this, we were able to confirm that the notification feature for gap times induced a change in users' awareness towards exercise. The training videos also received high ratings in terms of content, duration, variety, and continuity. Other feedback indicated that users were able to exercise casually in short periods of time. As a result, the 14-day proof-of-concept experiment suggested that the notification feature for gap times led to a change in users' awareness towards exercise. © 2024 IEEE.

关键词： Smartphones

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Development and verification of the higher-order mode neutron flux calculation code HARMONY2.0

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Nuclear Science and Techniques 2025年第1期36卷 207-225页

作者： Er-Pin Zhang Zi-Ning Ni Nian-Biao Deng Jin-Sen Xie Yong Liu Tao Yu School of Nuclear Science and Technology University of South ChinaHengyang 421000China Key Laboratory of Advanced Nuclear Energy Design and Safety Ministry of EducationHengyang 421000China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

Higher-order modes of the neutron diffusion/transport equation can be used to study the temporal behavior of nuclear reactors and can be applied in modal analysis, transient analysis, and online monitoring of the reactor core. Both the deterministic method and the Monte Carlo(MC) method can be used to solve the higher-order modes. However, MC method, compared to the deterministic method, faces challenges in terms of computational efficiency and α mode calculation stability, whereas the deterministic method encounters issues arising from homogenization-related geometric and energy spectra *** on the higher-order mode diffusion calculation code HARMONY, we developed a new higher-order mode calculation code, HARMONY2.0, which retains the functionality of computing λ and α higher-order modes from HARMONY1.0, but enhances the ability to treat complex geometries and arbitrary energy spectra using the MC-deterministic hybrid two-step strategy. In HARMONY2.0, the mesh homogenized multigroup constants were obtained using OpenMC in the first step,and higher-order modes were then calculated with the mesh homogenized core diffusion model using the implicitly restarted Arnoldi method(IRAM), which was also adopted in the HARMONY1.0 code. In addition, to improve the calculation efficiency, particularly in large higher-order modes, event-driven parallelization/domain decomposition methods are embedded in the HARMONY2.0 code to accelerate the inner iteration of λ∕α mode using OpenMP. Furthermore, the higher-order modes of complex geometric models, such as Hoogenboom and ATR reactors for λ mode and the MUSE-4 experiment facility for the prompt α mode, were computed using diffusion theory.

关键词： Neutron diffusion equation Higher-order modes Global homogenization Two-step method Domain

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A Tutorial on Quantized Feedback Control

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 5-17页

作者： Minyue Fu IEEE the School of System Design and Intelligent Manufacturing Shenzhen Key Laboratory of Control Theory and Intelligent Systems and Centre for Control Science and TechnologySouthern University of Science and TechnologyShenzhen 518055China

In this tutorial paper, we explore the field of quantized feedback control, which has gained significant attention due to the growing prevalence of networked control systems. These systems require the transmission of feedback information, such as measurements and control signals, over digital networks, presenting novel challenges in estimation and control design. Our examination encompasses various topics, including the minimal information needed for effective feedback control, the design of quantizers, strategies for quantized control design and estimation,achieving consensus control with quantized data, and the pursuit of high-precision tracking using quantized measurements.

关键词： Consensus control high-precision control networked control quantized estimation quantized feedback control robust control

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High-Order Fully Actuated system Models for Strict-Feedback systems With Increasing Dimensions

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IEEE/CAA Journal of Automatica Sinica 2024年第12期11卷 2451-2462页

作者： Xiang Xu Guang-Ren Duan Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and TechnologyShenzhen 518055 the School of System Design and Intelligent Manufacturing Southern University of Science and TechnologyShenzhen 518055China

This paper mainly addresses control problems of strict-feedback systems(SFSs)with increasing *** with the commonly-considered SFSs where the subsystems have the same dimension,we aim to handle more complex cases,i.e.,the subsystems in the considered SFSs are assumed to have increasing *** transforming the systems into highorder fully-actuated system(HOFAS)models,the stabilizing controllers can be directly *** first-order SFSs,secondorder and high-order SFSs are also considered.

关键词： Increasing dimensions high-order fully-actuated system nonlinear systems strict-feedback systems

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High-resolution neutronics model for ^(238)Pu production in high-flux reactors

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Nuclear Science and Techniques 2024年第5期35卷 226-236页

作者： Qing-Quan Pan Qing-Fei Zhao Lian-Jie Wang Bang-Yang Xia Yun Cai Jin-Biao Xiong Xiao-Jing Liu School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610200China

We proposed and compared three methods(filter burnup,single energy burnup,and burnup extremum analysis)to build a high-resolution neutronics model for 238Pu production in high-flux *** filter burnup and single energy burnup methods have no theoretical approximation and can achieve a spectrum resolution of up to~1 eV,thereby constructing the importance curve and yield curve of the full energy *** burnup extreme analysis method combines the importance and yield curves to consider the influence of irradiation time on production efficiency,thereby constructing extreme *** three curves,which quantify the transmutation rate of the nuclei in each energy region,are of physical significance because they have similar distributions.A high-resolution neutronics model for ^(238)Pu production was established based on these three curves,and its universality and feasibility were *** neutronics model can guide the neutron spectrum optimization and improve the yield of ^(238)Pu by up to 18.81%.The neutronics model revealed the law of nuclei transmutation in all energy regions with high spectrum resolution,thus providing theoretical support for high-flux reactor design and irradiation production of ^(238)Pu.

关键词： ^(238)Pu Neutronics model High-flux reactor Spectrum resolution Spectrum optimization

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Effects of Age-Related Decline on the Acoustic Characteristics of Daily Conversation 13

Effects of Age-Related Decline on the Acoustic Characteristi...

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13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Wakita, Yumi Iida, Atsuteru Osaka Institute of Technology Graduate School of Robot and System Engineering System Design Osaka Japan

ISBN: (纸本)9798350355079

To develop a method for estimating age-related decline using the analysis of daily conversation characteristics of elderly individuals, we compared the conversation traits of elderly people living in serviced housing with those living independently at home. Our analysis revealed that elderly individuals in serviced housing exhibited higher average and standard deviation (SD) values of F0 per utterance. Additionally, their speech recognition results showed significantly higher word error rates, with frequent instances where utterances spanning multiple words were misrecognized as entirely different word sequences. The log-mel spectrogram of misrecognized parts were often more unstable and ambiguous compared to those of elderly individuals living independently. n the paper, we discuss the usefulness of these characteristics for distinguishing between elderly individuals residing in serviced housing and those living independently. © 2024 IEEE.

关键词： Speech recognition

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A Study on system for Rehabilitation Using Sensing Data of Patients with Mental Illness 13

A Study on System for Rehabilitation Using Sensing Data of P...

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13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Takahashi, Yuuto Matsui, Kanae Tokyo Denki University Graduate School of System Design and Technology Tokyo Japan Tokyo Denki University Expolis.LLC Graduate School of System Design and Technology Tokyo Japan

ISBN: (纸本)9798350355079

This study presents a support system for rehabilitating patients with mental illnesses using data from wearable devices. Utilizing the Fitbit Sense 2 smartwatch, the system collects daily life data and displays it graphically for both patients and physicians, enhancing traditional diagnostic methods. The system comprises a sensor unit for data collection, an information processing unit, and an information presentation unit. A pilot study with four patients and one physician over three months showed effective data acquisition and significant utility in depression treatment. This integration of sensing data with traditional diagnostics offers valuable insights for mental health care. © 2024 IEEE.

关键词： Electronic health record

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Adapting Indoor Scene design to User-Selected Mood 2

Adapting Indoor Scene Design to User-Selected Mood

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2nd International Conference on Computer Graphics and Image Processing, CGIP 2024

作者： Takano, Reon Ozasa, Yuko Tokyo Denki University Graduate School of System Design and Technology Tokyo Japan

ISBN: (纸本)9798350374186

designing indoor scenes to align with user preferences is expected to be utilized in virtual environments including the metaverse. A previous approach is to automatically adjust the color of an object's texture placed in a room according to the mood selected by the user. However, this method cannot be considered sufficiently efficient. In this paper, we propose a method for designing indoor scenes efficiently that changes the colors of texture using Color Transfer. Experimental results show that the proposed method outperformed the previous method. © 2024 IEEE.

关键词： Color

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