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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Saki Kozu Izumi Kotani Kenta Seki Naoki Motoi Takahiro Nozaki Graduate School of Integrated Design Engineering Keio University Yokohama Japan Department of Electrical and Mechanical Engineering Nagoya Institute of Technology Nagoya Japan Graduate School of Maritime Science Kobe University Kobe Japan Department of System Design Engineering Keio University Yokohama Japan

ISBN: (数字)9798350355369

ISBN: (纸本)9798350355376

In micro-manipulations such as cell manipulation, it is desirable for the operator to feel the haptic sensation of the object. Bilateral control can remotely transmit position and force information between leader and follower systems. In this control, the use of a linear motor as a leader and a stacked piezoelectric actuator as a follower has been proposed to achieve micro-scale operation. There is a lot that needs to be clarified about bilateral control when the structure differs between leader and follower systems. In conventional scaled 4channel (4ch) bilateral control, a theory of oblique coordinate control has been proposed that considers differences in the inertia of leader and follower systems. However, when a piezoelectric actuator is used, the control scheme differs from using two linear motors with different inertias because the structures of the leader and follower systems are entirely different. Another method is scaled admittance bilateral control. However, the control design when structures and inertias of the two systems are different has not yet been clarified. In this paper, a scaled admittance bilateral control using a piezoelectric actuator and a linear motor is constructed. Experiments confirm that the realized scaled admittance bilateral control has the equivalent position and force tracking performances as the conventional scaled 4ch bilateral control using a piezoelectric actuator. Furthermore, the designed scaled admittance bilateral control is more robust to fluctuations in the nominal inertia of the piezoelectric actuator than the conventional scaled 4 ch bilateral control.

关键词： Fluctuations Mechatronics Control design Force Piezoelectric actuators Motors Haptic interfaces

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Enhanced Toughness and Ductility of T91 Steel after Exposure to Liquid Lbe Saturated by Oxygen at 350-500 °C

SSRN

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SSRN 2024年

作者： Zhou, Zhikun Tian, Chenwen Dong, Wenbo Du, Juan Liu, Yunpeng Wahab, Magd Abdel Chen, Ziguang Department of Engineering Mechanics School of Aerospace Engineering Huazhong University of Science and Technology Wuhan430074 China Laboratory Soete Faculty of Engineering and Architecture Ghent University Technologiepark Zwijnaarde 46 ZwijnaardeB-9052 Belgium Institute of Intelligent Manufacturing Jianghan University Wuhan430056 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China College of Engineering Yuan Ze University Taiwan Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment 1037 Luoyu Road Wuhan430074 China

The mechanical tensile properties of T91 steel after being oxidized in liquid LBE saturated by oxygen at 350-500 °C for up to 1,000 h are studied. Duplex oxide scales are found on T91 steels after the LBE exposure, and the thickness evolution is revealed. Oxidized T91 steels with surface oxide scale yield enhanced toughness and ductility, which is mainly attributed to the inner oxide layer. We show that the enhancing effect relies on the presence of the oxide scale, not its thickness. The possible enhancing effect of the oxide scale on the toughness of T91 steel by impeding the dislocation from emitting out of the steel surfaces is discussed and qualitatively verified by micro-scale elastoplastic simulations based on a newly proposed discrete dislocation dynamics and peridynamics superposition scheme. © 2024, The Authors. All rights reserved.

关键词： Ductility

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Silicon Waveguide-based Single Photon Source with 12.4% High Off-chip Measured Heralding Efficiency

Silicon Waveguide-based Single Photon Source with 12.4% High...

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Frontiers in Optics + Laser science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser science 2023

作者： Du, Jinyi Chen, George F.R. Gao, Hongwei Tan, Dawn T.H. Grieve, James A. Ling, Alexander Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 117543 Singapore Photonics Devices and System Group Singapore University of Technology and Design 8 Somapah Rd Singapore487372 Singapore Institute of Microelectronics A*STAR 2 Fusionopolis Way #08-02 Innovis Tower Singapore138634 Singapore Quantum Research Centre Technology Innovation Institute Abu Dhabi United Arab Emirates Department of Physics National University of Singapore Blk S12 2 Science Drive 3 117551 Singapore

ISBN: (纸本)9781957171296

We designed and fabricated a silicon chip-based heralded single-photon source with 12.4% off-chip measured heralding efficiency. In addition, we achieve a coincidence-to-accidental ratio of 443.7 and heralded self-correlation function of 0.0037 measured at a pair rate of 313kHz. This demonstration of low noise and few multi-photon events at high pair rate is important for practical applications in quantum communication. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： Beam splitters Four wave mixing Quantum communications Quantum light sources Silicon Wavelength division multiplexing

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A -0.64dB loss hybrid coupling platform with high stability for SOI single photon source 21

A -0.64dB loss hybrid coupling platform with high stability ...

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Quantum Communications and Quantum Imaging XXI 2023

ISBN: (纸本)9781510665989

We designed and fabricated a -0.64 dB loss hybrid coupling platform for silicon chips. The coupler is also stable enough to maintain within +-0.1 dB coupling fluctuation against 20 um fiber holder movement. This feature allows a constant photon stream over ten days with no active alignment mechanism. Furthermore, the fiber is engineered with centimeter-long small-core fiber spliced on the tip. This minimizes Raman noise and provides high stability compared with other coupling solutions based on ordinary UHNA fibers or lensed fibers. © 2023 SPIE.

关键词： Fibers

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A Unified Tensor-Based Joint AUD and ISAC Parameter Estimation With Large-Scale User Access

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IEEE Transactions on Cognitive Communications and Networking 2025年

作者： Yang, Tiancheng He, Dongxuan Hou, Huazhou Wang, Hua Yin, Hao Huang, Yongming Wang, Zhaocheng Quek, Tony Q.S. Beijing Institute of Technology School of Information and Electronics Beijing100081 China Purple Mountain Laboratories Nanjing211111 China Institute of China Electronic System Engineering Beijing100141 China Southeast University School of Information Science and Engineering Nanjing210096 China Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Beijing100084 China Tsinghua Shenzhen International Graduate School Shenzhen518055 China Singapore University of Technology and Design Singapore487372 Singapore

The integration of active user detection (AUD) and integrated sensing and communication (ISAC) enables the realization of communication and sensing functionalities over one hardware platform within the realm of ultra-massive machine-type communications (umMTC). However, the coupling of communication and sensing signals at the receiver poses challenges in accurately acquiring the respective parameters for both functionalities. In this paper, a unified tensor-based joint communication and sensing parameter estimation algorithm is proposed. First, leveraging CANDECOMP/PARAFAC decomposition (CPD), the channel model is converted into a unified tensor-based form, facilitating effective processing of the received signals. Subsequently, a two-stage CPD-based unified communication and sensing parameter estimation algorithm is developed. In the first stage, the factor matrix is estimated by utilizing the matrix subspace-based method and the Vandermonde property of the matrix. In the second stage, equivalent path parameters are extracted based on the estimated factor matrices. Furthermore, to solve the coupling problem of equivalent path parameters, a joint alternating iterative pilot-channel estimation (JAI-PCE) algorithm is proposed, effectively decoupling and accurately estimating the parameters. Simulation results verify the effectiveness of our proposed algorithm in terms of AUD, channel estimation, and radar sensing. © 2015 IEEE.

关键词： Channel estimation

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Nanometer Scanning with Micrometer Sensing: Beating Quantization Constraints in Lissajous Trajectory Tracking

arXiv

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arXiv 2024年

作者： Lohse, Matheus Castro, Rafael S. Salton, Aurélio T. Fu, Minyue School of Engineering Federal University of Rio Grade do Sul Porto Alegre Brazil School of Technology Pontifical Catholic University of Rio Grande do Sul RS Porto Alegre Brazil School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China

This paper addresses the task of tracking Lissajous trajectories in the presence of quantized positioning sensors. To do so, theoretical results on tracking of continuous time periodic signals in the presence of output quantization are provided. With these results in hand, the application to Lissajous tracking is explored. The method proposed relies on the internal model principle and dispenses perfect knowledge of the system equations. Numerical results show that an arbitrary small scanning resolution is achievable despite large sensor quantization intervals. © 2024, CC BY-NC-ND.

关键词： Quantization (signal)

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Safety-Aware Optimal Control of Nonlinear systems Using Off-Policy Reinforcement Learning*

Safety-Aware Optimal Control of Nonlinear Systems Using Off-...

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Complex systems and Intelligent science (CSIS-IAC), International Annual Conference on

作者： Mingduo Lin Bo Zhao Hongbing Xia Derong Liu School of Systems Science Beijing Normal University Beijing China School of Artificial Intelligence Anhui University Hefei China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China

In this paper, we investigate the safety-aware optimal control (SAOC) problem, which attempts to minimize a predefined performance index function while ensuring the safety of nonlinear systems. First, the barrier function-based system transformation is utilized to design an optimal control policy which maintains the system states located in the safety region. To deal with the input constraints, a non-quadratic cost function is imposed to the control input. Then, the Hamilton-Jacobi-Bellman equation is established to provide the solution of the SAOC problem. Moreover, by utilizing the off-policy Bellman equation, a data-based off-policy reinforcement learning (OPRL) algorithm is developed to obtain the safety-aware optimal controller in a model-free manner. To implement this algorithm, a data collection process with the barrier transform is executed to generate the off-policy trajectory data, and an actor-critic neural network structure with the least-square updating law is employed in the off-policy learning phase. Finally, a simulation example is provided to verify the effectiveness of the developed control method.

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A design RATIONALE ANALYSIS METHOD TOWARDS ROBUST ARTIFACT design

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Proceedings of the design Society 2021年 1卷 71-80页

作者： Yusuke Tsutsui Yuya Mitake Mar'atus Sholihah Shigeru Hosono Yoshiki Shimomura Department of System Design Tokyo Metropolitan University School of Computer Science Tokyo University of Technology

To design a more robust artifact, an artifact design based on a design rationale analysis is pivotal. Errors in previous design rationales that led to the degradation of artifact robustness in the past provide valuable knowledge towards improving the robust design. However, methods for exposing and analysing errors in design rationale remain unclear. This paper proposes a structured method for a design rationale analysis based on logical structuring. This method provides a well-constructed means of identifying and analysing errors in design rationale from the perspective of knowledge operation.

关键词： design management design process Decision making design cognition design rationale

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3D Convolution-Based Radio Frequency Fingerprinting for Satellite Authentication

3D Convolution-Based Radio Frequency Fingerprinting for Sate...

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IEEE Conference on Global Communications (GLOBECOM)

作者： Siyu Zhu Yuanyu Zhang Jinxiao Zhu Yin Chen Yulong Shen Xiaohong Jiang School of Computer Science and Technology Xidian University China Beijing Sunwise Information Technology Ltd. School of System Design and Technology Tokyo Denki University Japan Reitaku University Kashiwa Japan Graduate School of Media and Governance Keio University Fujisawa Japan School of Systems Information Science Future University Hakodate Japan

Satellites serve as a key component for the upcoming space-air-ground integrated networks, while their signals are susceptible to spoofing attacks. Radio frequency fingerprinting (RFF) has been recognized as a highly promising authentication approach to counteracting spoofing attacks. Despite extensive RFF schemes proposed for terrestrial networks, RFF for satellites remains largely unexplored except for a recently reported scheme named PAST-AI, which exploits the spatial property of the IQ imbalance of downlink signals to authenticate Iridium satellites. Although PAST-AI demonstrates the potential of RFF for satellite authentication, its authentication accuracy and time are unsatisfactory. To address this issue, this paper proposes a novel 3D convolution-based RFF scheme for Iridium satellite authentication, which exploits not only the spatial property but also the temporal property of the IQ imbalance. The proposed RFF scheme transforms short-period sequences of successive IQ samples into 3D data samples and uses a 3D convolutional neural network (CNN) to train an RFF model. To evaluate the authentication accuracy, we collected over 198000000 IQ samples from all 66 Iridium satellites and generated 1000 3D data samples for each satellite. The results showed that the proposed RFF scheme achieves more accurate authentication than PAST-AI using fewer IQ samples (i.e., shorter time).

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Analyzing Code Injection Attacks on Applications of Android Devices and Emulator

Analyzing Code Injection Attacks on Applications of Android ...

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International Conference on Computing, Engineering, and design (ICCED)

作者： Adhitia Erfina Rahmat Hidayat Rafli Radya Rizaldi Puput Riko Maulana Falentino Sembiring Departement of Infomation System Faculty of Engineering Computing and Design Nusa Putra University Sukabumi Indonesia Master of Computer Science Faculty of Information Technology Budi Luhur University Jakarta Indonesia

The Android operating system released by Google in 2007 has experienced very significant development. In 2019, the number of Android application users reached 2.5 billion. One of the contributing factors is the nature of the android application, which is very flexible and easy to install. Users can download APK files on the internet. Generally, APK files are stored in archive format, so they are pretty easy to manage. However, APK files may be used to spread malware behind this convenience. This study aims to provide an overview of the process of planting malware/backdoor on Android applications and how to prevent it. This study initiated the injection of malicious code on five android applications, namely WhatsApp, Telegram, DroidCam, Fifa Mobile, and Tokopedia. According to the results, four applications were successfully injected, while one application failed. The failure most likely occurred as a result of the application’s source code being obfuscated. Obfuscation is therefore strongly advised for Android applications to prevent code injection that could potentially lead to malware insertion.

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