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Dynamic Performance Prediction in Batch-Based Assembly System with Bernoulli Machines and Changeovers

Complex System Modeling and Simulation 2022年第3期2卷 224-237页

作者： Zunjun Wang Zhiyang Jia Xiuxuan Tian Jingchuan Chen Bei Pan State Key Laboratory of Intelligent Control and Decision of Complex Systems School of AutomationBeijing Institute of TechnologyBeijing 100081China Department of Industrial and Manufacturing Systems Engineering University of Hong KongHong Kong 999077China School of Engineering Tokyo University of TechnologyTokyo 192-0982Japan

Worldwide competition and diverse demand of customers pose great challenges to manufacturing enterprises. How to organize production to achieve high productivity and low cost becomes their primary task. In the mean time, the rapid pace of technology innovation has contributed to the development of new types of flexible automation. Hence, increasing manufacturing enterprises convert to multi-product and small-batch production, a manufacturing strategy that brings increased output, reduced costs, and quick response to the market. A distinctive feature of small-batch production is that the system operates mainly in the transient states. Transient states may have a significant impact on manufacturing systems. It is therefore necessary to estimate the dynamic performance of systems. As the assembly system is a typical class of production systems, in this paper, we focus on the problem of dynamic performance prediction of the assembly systems that produce small batches of different types of products. And the system is assumed to be characterized with Bernoulli reliability machines, finite buffers, and changeovers. A mathematical model based on Markovian analysis is first derived and then, the analytical formulas for performance evaluation of three-machine assembly systems are given. Moreover, a novel approach based on decomposition and aggregation is proposed to predict dynamic performance of large-scale assembly systems that consist of multiple component lines and additional processing machines located downstream of the assemble machine. The proposed approach is validated to be highly accurate and computationally efficient when compared to Monte Carlo simulation.

关键词： flexible assembly system dynamic performance Bernoulli machines finite buffers changeovers

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Flight Simulator Column Force Modeling by System Identification 23

Flight Simulator Column Force Modeling by System Identificat...

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15th International Conference on Computer Modeling and Simulation, ICCMS 2023

作者： Cai, Xiangqun Lei, Xiaoyong Dai, Shuling Li, Weiqi State Key Lab. of Virtual Reality Technology and Systems Beihang University China School of Automation Science and Electrical Engineering Beihang University China

ISBN: (纸本)9798400707919

In this work, a modeling method of aircraft control column force based on system identification is proposed. Using the data of "lever force displacement"and "lever release"tests, the column force model of the longitudinal channel of the control system is established, and least square method is used to identify the model parameters. The acquired model is used for the simulation of the irreversible hydraulic control system, and the simulation results are compared with test results. It is indicated that the simulation accuracy meets the requirements of CCAR 60 for the column force model of the simulator control system. The proposed model has a simple structure and high computational efficiency. The identification method is independent of the original design parameters of the control system and has good robustness. © 2023 ACM.

关键词： Flight simulators

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Polarization-induced photocurrent switching effect in heterojunction photodiodes

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Nano Research 2023年第4期16卷 5503-5510页

作者： Dingbo Chen Yu-Chang Chen Guang Zeng Yu-Chun Li Xiao-Xi Li Dong Li Chao Shen Nan Chi Boon S.Ooi David Wei Zhang Hong-Liang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Key Laboratory for Information Science of Electromagnetic Waves Department of Communication Science and EngineeringFudan UniversityShanghai 200433China Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia

The unipolar photocurrent in conventional photodiodes(PDs)based on photovoltaic effect limits the output modes and potential versatility of these devices in *** photodiodes with photocurrent switching are emerging as a promising solution for obtaining photoelectric devices with unique and attractive functions,such as optical logic ***,we design an all-solid-state chip-scale ultraviolet(UV)PD based on a hybrid GaN heterojunction with engineered bipolar polarized electric *** introducing the polarization-induced photocurrent switching effect,the photocurrent direction can be switched in response to the wavelength of incident light at 0 V *** particular,the photocurrent direction exhibits negative when the irradiation wavelength is less than 315 nm,but positive when the wavelength is longer than 315 *** device shows a responsivity of up to−6.7 mA/W at 300 nm and 5.3 mA/W at 340 nm,*** particular,three special logic gates in response to different dual UV light inputs are demonstrated via a single bipolar PD,which may be beneficial for future multifunctional UV photonic integrated devices and systems.

关键词： GaN heterostructure ultraviolet(UV)photodiodes bipolar photocurrent optical logic device

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A glance over the past decade: road scene parsing towards safe and comfortable autonomous driving

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Autonomous intelligent systems 2025年第1期5卷 1-15页

作者： Fan, Rui Li, Jiahang Li, Jiaqi Wang, Jiale Long, Ziwei Jia, Ning Liu, Yanan Wang, Wenshuo Bocus, Mohammud J. Vityazev, Sergey Chen, Xieyuanli Xiao, Junhao Andreev, Stepan Lu, Huimin Dvorkovich, Alexander College of Electronics & Information Engineering Shanghai Institute of Intelligent Science and Technology Shanghai Research Institute for Intelligent Autonomous Systems the State Key Laboratory of Intelligent Autonomous Systems and the Frontiers Science Center for Intelligent Autonomous Systems Tongji University 4800 Caoan Rd Shanghai201804 China College of Electronics & Information Engineering Tongji University 4800 Caoan Rd Shanghai201804 China School of Microelectronics Shanghai University 20 Chengzhong Rd Shanghai201800 China School of Mechanical Engineering Beijing Institute of Technology 5 Zhongguancun South Street Beijing100081 China Department of Electrical and Electronic Engineering University of Bristol Woodland Road England BristolBS8 1UB United Kingdom Faculty of Radio Engineering and Telecommunications Ryazan State Radio Engineering University Ulitsa Gagarina 59/1 Ryazan Oblast Ryazan390005 Russia College of Intelligence Science and Technology National University of Defense Technology 109 Deya Road Changsha410073 China Microwave Photonics Department Telecommunications Center Moscow Institute of Physics and Technology Institutsky Lane 9 Moscow Region Dolgoprudny141701 Russia Multimedia Technology and Telecom Department Telecommunications Center Moscow Institute of Physics and Technology Institutsky Lane 9 Moscow Region Dolgoprudny141701 Russia

Road scene parsing is a crucial capability for self-driving vehicles and intelligent road inspection systems. Recent research has increasingly focused on enhancing driving safety and comfort by improving the detection of both drivable areas and road defects. This article reviews state-of-the-art networks developed over the past decade for both general-purpose semantic segmentation and specialized road scene parsing tasks. It also includes extensive experimental comparisons of these networks across five public datasets. Additionally, we explore the key challenges and emerging trends in the field, aiming to guide researchers toward developing next-generation models for more effective and reliable road scene parsing. © The Author(s) 2025.

关键词： Semantics

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Directed Acyclic Transformer for Non-Autoregressive Machine Translation 39

Directed Acyclic Transformer for Non-Autoregressive Machine ...

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39th International Conference on Machine Learning, ICML 2022

作者： Huang, Fei Zhou, Hao Liu, Yang Li, Hang Huang, Minlie The CoAI Group Tsinghua University China Institute for Artificial Intelligence State Key Lab of Intelligent Technology and Systems Beijing National Research Center for Information Science and Technology Department of Computer Science and Technology Tsinghua University China ByteDance AI Lab

Non-autoregressive Transformers (NATs) significantly reduce the decoding latency by generating all tokens in parallel. However, such independent predictions prevent NATs from capturing the dependencies between the tokens for generating multiple possible translations. In this paper, we propose Directed Acyclic Transfomer (DA-Transformer), which represents the hidden states in a Directed Acyclic Graph (DAG), where each path of the DAG corresponds to a specific translation. The whole DAG simultaneously captures multiple translations and facilitates fast predictions in a non-autoregressive fashion. Experiments on the raw training data of WMT benchmark show that DA-Transformer substantially outperforms previous NATs by about 3 BLEU on average, which is the first NAT model that achieves competitive results with autoregressive Transformers without relying on knowledge distillation. Copyright Â© 2022 by the author(s)

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Running and Steering Gait Generation Based on Double-Leg 3D-SLIP Model for Bipedal Robots

Running and Steering Gait Generation Based on Double-Leg 3D-...

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International Conference on Biomimetic Intelligence and Robotics & Medical Robotics Forum, ICBIR+MRF 2024

作者： Luo, Guifu Du, Ruilong Song, Sumian Yuan, Haihui Zhou, Hua Gu, Jason The State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Zhejiang Hangzhou310058 China Wuba Intelligent Technology Co. Ltd. Hangzhou China The Department of Electrical Engineering Dalhousie University HalifaxNS Canada

The spring-loaded inverted pendulum (SLIP) provides a bio-inspired perspective to generate stable, fast, and compliant gaits for bipedal robots. In this work, an improved decoupled control strategy was proposed to generate stable, fast, human-like, and practical 3D running and steering gaits for double-leg three-dimensional SLIP (3D-SLIP). In the sagittal plane, an approximate-SLIP- based deadbeat controller was introduced for forward velocity and running height tracking with low computational cost and a fast convergence rate. In the lateral plane, an alternating term was introduced to the footstep controller for imitating lateral swing and avoiding left and right leg collision. Simulations were conducted to verify the stability of the periodic running gait, to explore the tracking performance of the forward velocity with the proposed control strategy, and to generate agile and versatile running and steering gaits for bipedal robots. © 2024 The Authors.

关键词： Inverted pendulum

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Resonance-enhanced generation of optical harmonics from dielectric metasurfaces 14

Resonance-enhanced generation of optical harmonics from diel...

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Metamaterials XIV 2024

作者： Tonkaev, Pavel Lai, Fangxing Song, Qinghai Kruk, Sergey Koshelev, Kirill Kivshar, Yuri Nonlinear Physics Center Research School of Physics Australian National University CanberraACT2601 Australia Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9781510672987

Nonlinear dielectric metasurfaces provide a promising platform to control and manipulate the optical frequency conversion at the nanoscale, suggesting new applications in imaging, lasing, and sensing. Here, we engage symmetry-broken silicon metasurfaces to enhance the second- and third-harmonic generation. We design and fabricate amorphous silicon metasurfaces supporting optical bound states in the continuum and guided-mode resonances, which greatly boost light-matter interaction resulting in several-order enhancements in both second- and third-harmonic generation. © 2024 SPIE.

关键词： Harmonic analysis

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Low Operating Voltage in HfO2/ZrO2Superlattice Ferroelectric Capacitor Achieved by Thickness Scaling 17

Low Operating Voltage in HfO2/ZrO2Superlattice Ferroelectric...

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17th IEEE International Conference on Solid-state and Integrated Circuit technology, ICSICT 2024

作者： Li, Dongya Liu, Huan Du, Peiyuan Yu, Fei Jin, Chengji Yu, Xiao Liu, Yan Han, Genquan Hao, Yue Xidian University State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Xi'an710071 China Research Center for Intelligent Chips Zhejiang Lab Hangzhou311121 China Hangzhou Institute of Technology Xidian University Hangzhou311231 China

ISBN: (纸本)9798350361834

In this study, the influence of thickness in HfO 2 ZrO 2 superlattice(SL_HZO)ferroelectric capacitors with 1 nm TiO2 seed layer has been explored. Thanks to the relatively unchanged E c (coercive field), as the SL_HZO film thickness decreases to 6 nm, the operating voltage is reduced to 0.8 V for one-shot operation, while maintaining a remnant polarization (P r ) above 6.2 μ C cm 2. Moreover, a 2P r value of 20.4 μ C cm 2 at an operating voltage of 1 V for stable memory operation has been achieved. These voltages are within the range compatible with scaled silicon technologies. © 2024 IEEE.

关键词： Ferroelectricity

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Distributed event-triggered Nash equilibrium seeking for aggregative game with second-order dynamics

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IEEE/CAA Journal of Automatica Sinica 2025年

作者： Huang, Yi Sun, Jian Fei, Qing State Key Laboratory of Autonomous Intelligent Unmanned Systems School of Automation Beijing Institute of Technology Beijing100081 China

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Walking Control for a Self-Balancing Exoskeleton on Flat Ground

Walking Control for a Self-Balancing Exoskeleton on Flat Gro...

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2023 IEEE International Conference on Real-Time Computing and Robotics, RCAR 2023

作者： Li, Jinke Tian, Dingkui Li, Feng Sun, Jianquan Yin, Meng Wu, Xinyu University of Chinese Academy of Sciences Shenzhen College of Advanced Technology Shenzhen518055 China Siat Cuhk Joint Laboratory of Robotics and Intelligent Systems China Chinese Academy of Sciences Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Shenzhen518055 China

ISBN: (纸本)9798350327182

Designed to provide rehabilitation or the assistance of walking for individuals who are with lower limb muscle injuries or spinal during their activities, self-balancing lower limb exoskeletons have been developed. This paper introduces an innovative controller for a fully actuated exoskeleton that ensures stable walking for wearers without the need for external devices. The exoskeleton robot is represented as a center of mass model, and based on this representation, the trajectory generation and controller are discussed, aiming to improve locomotion stability. To assess the stability and dynamic performance, a stable walking experiment with the exoskeleton was conducted, involving a male subject. © 2023 IEEE.

关键词： Exoskeleton (Robotics)

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