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作者： Liu, Changxi Yang, Chengliang Liu, Jia Tang, Yujin Lin, Zhengjie Li, Long Liang, Hai Lu, Weijie Wang, Liqiang State Key Laboratory of Metal Matrix Composites School of Material Science and Engineering Shanghai Jiao Tong University No. 800 Dongchuan Road Shanghai200240 China National Center for Translational Medicine Shanghai Jiao Tong University No. 800 Dongchuan Road Shanghai200240 China Department of Orthopaedics Affiliated Hospital of Youjiang Medical University for Nationalities Guangxi Key Laboratory of Basic and Translational Research of Bone and Joint Degenerative Diseases Guangxi Baise533000 China 3D Printing Clinical Translational and Regenerative Medicine Center Shenzhen Shekou People's Hospital China Department of Stomatology Shenzhen Shekou People's Hospital China

Bioprinting provides a new perspective to solve the problem of organ shortage. despite recent technological advances, insufficient printing resolution is still one of the reasons that restrain the development of bioprinting. Normally, the machine axes movement cannot be dependably used to predict material placement, and the printing path deviates from the predetermined designed reference trajectory in varying degrees. A computer vision-based method is proposed to correct the trajectory deviation and improve the printing accuracy. The image algorithm calculates the deviation between the printed trajectory and the reference trajectory to generate an error vector. Furthermore, the axes reference trajectory is modified according to the normal vector approach in the second printing to compensate for the deviation error, and the highest correction efficiency could be achieved 91%. More importantly, we found for the first time that the correction results are in a normal distribution instead of a random distribution. © 2022

关键词： Computer vision

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Parallel Building Process Management System

Parallel Building Process Management System

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2021 China Automation Congress, CAC 2021

作者： Liu, Sheng Shen, Zhen dong, Xisong Hu, Bin Xiong, Gang Chen, Xiaoyu State Key Laboratory for Management and Control of Complex Institute of Automation Chinese Academy of Sciences Beijing China Beijing engineering Research Center of intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing China Institution of Intelligent Manufacturing Qingdao Academy of Intelligent Industries Qingdao China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781665426473

With the development of industrialized building and intelligence technology, it becomes necessary and possible to realize building process intelligence management. In recent years, digital twins and parallel management get more and more attentions in academic research and industrial applications. This paper addresses how parallel building system performs intelligence management on industrialized building process. Firstly, actual building model and artificial building model are created according to actual building system. Then business driving engine and simulation engine drive actual building model and artificial building model, respectively. Participants receive and send messages by software interfaces. Business driving engine changes the status of actual building model and sends the changes to simulation engine. Simulation engine updates the status of artificial building model and runs artificial building model with various parameters. Then it sends the parameter with the best effect to business driving engine. Business driving engine sends recommendations to participants according to the best parameter. Thus, building process intelligence management is achieved. © 2021 IEEE

关键词： Engines

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Parallel Systems Framework: A Safe and Efficient Testbed for Unmanned Ships

Parallel Systems Framework: A Safe and Efficient Testbed for...

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digital Twins and Parallel Intelligence (dTPI), IEEE International Conference on

作者： Long Fu Zhen Shen Xisong dong Yunjun Han Shuguang Yang Gang Xiong Fei-Yue Wang School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing China Guangdong Engineering Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan China Schoool of Rail Transportation Shandong Jiaotong University Jinan China State Key Laboratory for Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (数字)9798350349252

ISBN: (纸本)9798350349269

In this study, unmanned ships test platform based on the parallel systems framework is proposed to improve the test efficiency and accuracy of unmanned ships in complex ocean environment. The parallel intelligence theory and ACP approach, the efficient interaction between virtual and real environment is achieved, which provides more comprehensive and accurate data for unmanned ships testing. Future research will further expand the scope of virtual environment simulation and improve systems accuracy and response speed to a wider range of unmanned ships test requirements.

关键词： Accuracy Oceans Virtual environments digital twins Marine vehicles Testing

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Combining the Effect of High Resolution and Low Separation Force in Liquid Crystal display (Lcd) Vat Photopolymerization (Vpp) Using Flexible Polydimethylsiloxane (Pdms) Interface

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SSRN 2024年

作者： Paral, Sandeep Kumar Lin, ding-Zheng Hsieh, Bing-Jen Cheng, Yih-Lin Jeng, Jeng-Ywan Taiwan High Speed 3D Printing Research Center National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd. Taipei106 Taiwan Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd. Taipei106 Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No. 1 University Rd. Tainan701 Taiwan Department of Design Indian Institute of Technology Guwahati Assam Guwahati781039 India

The liquid crystal display vat photopolymerization (LCd VPP) technique is gaining prominence due to its ability to cost-effectively increase the print area, aligning with the development of the large area LCd industry and facilitating mass customization. However, the large separation force between the cured layer and the interface presents a significant challenge for scaling up the technology. The existing vat interface modification methods have predominantly focused on digital light processing (dLP) VPP, where the overall vat interface thickness increases as a result of additional mechanisms or the application of larger thickness soft material coatings on glass or polymethyl methacrylate (PMMA). due to the adjustable focal plane, this approach presents no issues for dLP VPP. However, the projected image is blurred for LCd VPP due to the large interface thickness, causing over-curing and dimensional inaccuracy. To address this challenge, a cost-effective solution has been proposed to develop a thin polydimethylsiloxane (PdMS) film where the edges of the film are fixed with the vat, known as a flexible PdMS interface. This innovation has resulted in a remarkable 100-fold reduction in the separation force compared to the conventional PdMS-coated on the PMMA vat bottom (rigid PdMS interface) at the same PdMS thickness. The unique properties of PdMS, including its low elastic modulus, have been instrumental in achieving this reduction while using it as a flexible interface, surpassing even commercially used Teflon film by a factor of 10. A developed analytical model of the separation force provides insights into the underlying mechanisms governing the behavior of the flexible and rigid PdMS interfaces during separation processes. The separation mechanisms of flexible and rigid PdMS interfaces have been identified and illustrated using numerical simulation models. These findings offer insights into the significant reduction of the separation force in the case of the flex

关键词： Photopolymerization

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Thermal Features and its Effect on the Properties of Aisi 4140 Fabricated by Conventional and Extreme High-Speed Laser material deposition

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SSRN 2023年

作者： Li, Tianci Zhang, dongyun Zhang, Lele Chen, Geng Schopphoven, Thomas Gasser, Andres Poprawe, Reinhart Institute of Laser Engineering Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing100124 China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China National International Science and Technology Cooperation Base Beijing Jiaotong University Beijing100044 China Fraunhofer Institute for Laser Technology ILT Steinbachstr. 15 Aachen52074 Germany

The extreme high-speed laser material deposition (EHLA) process has the potential to enable additive manufacturing for mass production by overcoming the limitations of slow scanning speed in conventional laser material deposition (LMd) processes. Thermal features are the key factors to link process and properties. A sound understanding of process-thermal-property relationships is essential for performance control and process optimization of a deposited component. In this study, we studied the thermal characteristics within a single layer and among layers for continuous processing using the numerical method, and reveal the mechanism of microstructure and hardness changes of AISI 4140 material formed by EHLA and LMd processes through the analysis of thermal properties and temperature history results. The grain size and hardness evolution for both processes during single-layer cladding and continuous forming processes were investigated. The results revealed that the grain refinement effect in continuous LMd processing is stronger than that in EHLA process (from 30.0 μm for single layer to 3.2 μm for multi layers vs. from 18.6 μm for single layer to 2.2 μm for multi layers). Furthermore, the enhanced tensile results of EHLA process were found similar to those prepared through conventional method with quench and tempering at 600°C. © 2023, The Authors. All rights reserved.

关键词： Thermodynamic properties

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double deep Q-learning for Anti-saturation Attack Problem of Warship Group

Double Deep Q-learning for Anti-saturation Attack Problem of...

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digital Twins and Parallel Intelligence (dTPI), IEEE International Conference on

作者： Wei Li Gang Xiong Hao Tao Yunjun Han Fang Wang Xisong dong Zhen Shen State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences School of Artificial Intelligence University of Chinese Academy of Sciences Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences China China Ship Development and Design Center Wuhan China School of Control Science and Engineering (CSE) Shandong University Jinan China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan China

Anti-saturation attack (ASA) strategy is vital for the survival of a warship group, and attracts the focus of many researchers. In this paper, the dynamics of ASA is formulated as a Markov decision Process (MdP) with an enhanced states space since those characters are involved, such as the formation and detection and interception areas of warship group. A reinforcement learning method (double deep Q-leaning, ddQN) is developed to solve the problem and deal with the curse of dimensionality whereby the cost-to-go value is calculated by a marine engagement simulation system. A heuristic defense algorithm guided by field expert knowledge is designed for comparison. The experimental results show that the ddQN method performs better in anti-saturation attack scenarios.

关键词： Industries Heuristic algorithms digital twin Conferences Knowledge based systems Reinforcement learning Markov processes

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Corrigendum to “Lattice-based interpenetrating phase composite metamaterial fabricated with hybrid material extrusion process for tunable mechanical properties” [J Mater Res Technol 35 (2025) 2955–2972]

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Journal of materials research and technology 2025年 36卷 8351-8355页

作者： Ritik Raj Jung-Ting Tsai Mayur Jiyalal Prajapati Jeng-Ywan Jeng Taiwan High-Speed 3D Printing Research Center National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd. Taipei 106 Taiwan ROC Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd. Taipei 106 Taiwan ROC Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No. 1 Dasyue Rd. Tainan City 701 Taiwan ROC Department of Design Indian Institute of Technology Guwahati Guwahati 781039 Assam India The Extreme Light Infrastructure ERIC Za Radnicí 835 Dolní Břežany 252 41 Prague Czech Republic

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Wireless,multimodal sensors for continuous measurement of pressure,temperature,and hydration of patients in wheelchair

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npj Flexible Electronics 2023年第1期7卷 479-493页

作者： Seokjoo Cho Hyeonseok Han Hyunwoo Park Sung-Uk Lee Jae-Hwan Kim Sung Woo Jeon Mengqiu Wang Raudel Avila Zhaoqian Xi Kabseok Ko Minsu Park Jungyup Lee Myungwoo Choi Je-Sang Lee Weon Gi Min Byeong-Ju Lee Soyeong Lee Jungrak Choi Jimin Gu Jaeho Park Min Seong Kim Junseong Ahn Osman Gul Chankyu Han Gihun Lee Seunghwan Kim Kyuyoung Kim Jeonghyun Kim Chang-Mo Kang Jahyun Koo Sung Soo Kwak Sungbong Kim dong Yun Choi Seokwoo Jeon Hyung Jin Sung Yong Bae Park Minkyu Je Young Tae Cho Yong Suk Oh Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Advanced 3D Printing Technology Development Division Korea Atomic Energy Research InstituteDaejeon 34057Republic of Korea Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116023P.R.China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Ningbo Institute of Dalian University of Technology Ningbo 315016China Department of Electronics Engineering Kangwon National UniversityChuncheon 24341Republic of Korea Querrey-Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Sibel Health Inc NilesIL 60714USA Department of Materials Science and Engineering KAIST Institute for The Nanocentury(KINC)Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Rehabilitation Medicine Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of planning and development Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of rehabilitation medicine Pusan national university hospitalBusan 49241Republic of Korea Department of AI Convergence Network Ajou UniversitySuwon 16499Republic of Korea Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897Republic of Korea Korea Photonics Technology Institute Gwangju 61007Republic of Korea School of Biomedical Engineering Korea UniversitySeoul 02841Republic of Korea Interdisciplinary Program in Precision Public Health Korea UniversitySeoul 02841Republic of Korea Center

Individuals who are unable to walk independently spend most of the day in a *** population is at high risk for developing pressure injuries caused by ***,early diagnosis and prevention of these injuries still remain ***,we introduce battery-free,wireless,multimodal sensors and a movable system for continuous measurement of pressure,temperature,and hydration at skin *** device design includes a crack-activated pressure sensor with nanoscale encapsulations for enhanced sensitivity,a temperature sensor for measuring skin temperature,and a galvanic skin response sensor for measuring skin hydration *** movable system enables power harvesting,and data communication to multiple wireless devices mounted at skin-cushion interfaces of wheelchair users over full body *** evaluations and numerical simulations of the devices,together with clinical trials for wheelchair patients,demonstrate the feasibility and stability of the sensor system for preventing pressure injuries caused by sitting.

关键词： injuries modal mounted

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The in-vivo medial and lateral collateral elongation correlated with knee functional score and joint space following unicompartmental knee arthroplasty

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Orthopaedics and Traumatology: Surgery and research 2025年第4期111卷 104052页

作者： Xia, Chunjie Zheng, Nan Gu, Tianyun dai, Huiyong Zou, diyang Wang, Qi Tsai, Tsung-Yuan School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China School of Biomedical Engineering & Med-X Research Institute Shanghai Jiao Tong University China Engineering Research Center for Digital Medicine of the Ministry of Education Shanghai China Shanghai Key Laboratory of Orthopaedic Implants & Clinical Translation R&D Center of 3D Printing Technology Department of Orthopaedic Surgery Shanghai Ninth People's Hospital Shanghai Jiao Tong University School of Medicine Shanghai China Department of Orthopedics Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai China

Background: The medial collateral ligament (MCL) and lateral collateral ligament (LCL) are paramount for joint stability. Their elongation patterns may change during fixed-bearing and mobile-bearing unicompartmental knee arthroplasty (FB and MB UKA). This study aims to explore the relationship between the elongation of MCL, LCL, and changes in joint space, as well as their correlation with functional scale scores during FB and MB UKA. Hypothesis: We hypothesize that MCL and LCL have different elongation patterns in UKA patients, and there is a correlation between elongation and joint space and functional scores. materials and methods: The study recruited 24 patients undergoing UKA on a unilateral knee (13 FB and 11 MB). A dual fluoroscopic imaging system was employed to assess in-vivo knee kinematics during static standing and single-leg lunge. The superficial and deep MCL (sMCL, dMCL) and LCL were divided into anterior, medium, and posterior portions. The virtual ligament method quantified in-vivo ligament lengths. Analysis focused on the correlation of normalized ligament lengths with functional scores and joint space. Results: 1. LCL Elongation in FB UKA: There is a significant increase in LCL elongation during early and mid-flexion of the single-leg lunge (p < 0.05). 2. MCL Elongation in MB UKA: Both sMCL and dMCL exhibit significant elongation during early and mid-flexion of the single-leg lunge (p < 0.05). 3. Correlation with Functional Scores: differences in collateral ligament elongation in FB UKA are significantly correlated with the OKS and KSS, highlighting the impact on functional outcomes. In MB UKA, differences in ligament elongation are significantly correlated with the FJS. 4. Joint Space Correlation: There is a significant correlation between the elongation of the anterior and medium portions of dMCL and joint space in the surgical compartment during mid- and deep flexion (30−100°, p < 0.05, r > 0.64). Conclusion: The study reveals distinct ligament

关键词： In-vivo Lateral collateral ligament Ligament length Medial collateral ligament Unicompartmental knee arthroplasty

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Microstructural evolution and mechanical instability of Mar-M509 superalloy fabricated by laser powder bed fusion under short-term thermal exposure

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materials Science and Engineering: A 2025年 940卷

作者： Cao, Tingwei Chen, Chaoyue Wei, daixiu Zhao, Ruixin Hou, Yuyang Lu, Lin Yang, Tao Ke, Linda Gong, Wu Kawasaki, Takuro Harjo, Stefanus Shi, Lei Lei, Liming Wang, Jiang Ren, Zhongming State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai200444 China Jiangsu Belight Laboratory State Key Laboratory of Advanced Casting Technologies Nanjing University of Science and Technology Nanjing210094 China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of Materials Co. Ltd Shanghai200437 China Department of Materials Science and Engineering City University of Hong Kong China Shanghai Engineering Technology Research Center for Near-net Forming of Metal Materials Shanghai Aerospace Precision Machinery Institute Shanghai200444 China J-PARC Center Japan Atomic Energy Agency 2-4 Shirakata Tokai Naka-gun Ibaraki319-1195 Japan AECC Shanghai Commercial Aircraft Engine Manufacturing Co. Ltd. Shanghai201306 China TaiHang Laboratory Chengdu610213 China

The thermal stability of microstructure and mechanical performance is crucial for the industrial application of laser powder bed fusion (LPBF) superalloy components in gas turbines and jet engines. This work investigated the microstructural evolution and strengthening mechanism of LPBF Mar-M509 cobalt-based superalloy before and after thermal exposure at 1200 °C using multi-scale microstructural characterization and in situ neutron diffraction tensile testing. The as-built Mar-M509 superalloy exhibited a heterogeneous microstructural features with coarse columnar and fine equiaxed grains, both containing dendritic and cellular substructures enriched with nanoscale carbides and high-density dislocations. The ultra high strength (1504 ± 4 MPa) of the as-built sample was primarily attributed to dislocation-precipitation synergistic strengthening. After thermal exposure at 1200 °C for 4 h, the dendritic and cellular substructures disappeared and the dislocation density decreased significantly. Meanwhile, Cr, Ta, and other solute elements segregated along fast diffusion channels such as dislocations, stacking faults, and grain boundaries, and combined with the liberated carbon to re-precipitate as coarse M23C6 and MC carbides. The precipitation of microscale M23C6 carbides at the grain boundaries not only weakened the Orowan strengthening mechanism but also reduced the grain boundary strength, resulting in a decrease in the tensile strength to 1192 ± 8 MPa. High-temperature stress rupture testing further revealed microstructural instability in the as-built sample, which adversely affected its stress rupture life. Although the elongation of the sample after thermal exposure decreased from 25.9 % to 10.64 %, its stress rupture life increased from 119:01 h:min to 331 h. This study reveals the microstructural evolution and instability of LPBF Mar-M509 superalloy under high-temperature exposure and the impacts on mechanical properties, which provides critical support for the

关键词： Tensile testing

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