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Ventilated surface-based lattice structures designed for polymer powder bed fusion process

International Journal of Advanced Manufacturing technology 2024年第1-2期132卷 113-126页

作者： Verma, Saurav Kumar, Ajeet 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 Lab Department of Design Indian Institute of Technology Guwahati Assam Guwahati781039 India Department of Design Indian Institute of Technology Guwahati Assam Guwahati781039 India Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No. 1 Dasyue Rd Tainan City701 Taiwan Additive Manufacturing Journal NTUST Taipei Taiwan

This work addresses the issues of entrapment of polymer powder and the post-processing powder removal challenges in surface-based lattice structures 3d printed with powder bed-based additive manufacturing (AM) technology. A ventilation design approach has been proposed to enhance the powder removability from the widely researched three-dimensional gyroid and two-dimensional honeycomb lattice structure. The flow characteristics and mechanical behavior of the designed lattices were analyzed using computational fluid dynamics (CFd) and finite element analysis (FEA), respectively, followed by experimental powder flow and compression testing. HP jet fusion 4200® industrial 3d printer was used for printing the lattice structures for experimental validation. The results showed a 65–85% improvement in powder flowability, with a minimum to severe reduction in mechanical strength of different lattice structures. The study can be applied to designing products with multi-functional properties with surface-based lattice structures by employing the principle of design for additive manufacturing and post-processing (dfAM&PP). © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Finite element method

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Accelerated fracture healing by osteogenic Ti45Nb implants through the PI3K–Akt signaling pathway

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Bio-design and Manufacturing 2023年第6期6卷 718-734页

作者： Jia Tan Jiaxin Li Zhaoyang Ran Junxiang Wu dinghao Luo Bojun Cao Liang deng Xiaoping Li Wenbo Jiang Kai Xie Lei Wang Yongqiang Hao Shanghai Key Laboratory of Orthopaedic Implants Department of Orthopaedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Department of Orthopedics The Second Affiliated Hospital of Harbin Medical UniversityHarbin 150001China Clinical and Translational Research Center for 3D Printing Technology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Ningxia Orient Ta Ind Co. Ltd.Shizuishan 753000China

The key to managing fracture is to achieve stable internal fixation,and currently,biologically and mechanically appropriate internal fixation devices are urgently *** excellent biocompatibility and corrosion resistance,titanium–niobium alloys have the potential to become a new generation of internal fixation materials for ***,the role and mechanism of titanium–niobium alloys on promoting fracture healing are still ***,in this study,we systematically evaluated the bone-enabling properties of Ti45Nb via in vivo and in vitro *** vitro,we found that Ti45Nb has an excellent ability to promote MC3T3-E1 cell adhesion and proliferation without obvious *** phosphatase(ALP)activity and alizarin red staining and semiquantitative analysis showed that Ti45Nb enhanced the osteogenic differentiation of MC3T3-E1 cells compared to the Ti6Al4V *** the polymerase chain reaction experiment,the expression of osteogenic genes in the Ti45Nb group,such as ALP,osteopontin(OPN),osteocalcin(OCN),type 1 collagen(Col-1)and runt-related transcription factor-2(Runx2),was significantly higher than that in the control ***,in the western blot experiment,the expression of osteogenic-related proteins in the Ti45Nb group was significantly increased,and the expression of PI3K–Akt-related proteins was also higher,which indicated that Ti45Nb might promote fracture healing by activating the PI3K–Akt signaling *** vivo,we found that Ti45Nb implants accelerated fracture healing compared to Ti6Al4V,and the biosafety of Ti45Nb was confirmed by histological ***,immunohistochemical staining confirmed that Ti45Nb may promote osteogenesis by upregulating the PI3K/Akt signaling *** study demonstrated that Ti45Nb exerts an excellent ability to promote fracture healing as well as enhance osteoblast differentiation by activating the PI3K/Akt signaling pathway,and its good biosafety has been confirmed

关键词： Fracture healing Ti45Nb alloy PI3K–Akt pathway Orthopedic implant

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Mvp-Hot: A Moderate Visual Prompt for Hyperspectral Object Tracking

SSRN

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SSRN 2024年

作者： Zhao, Lin Xie, Shaoxiong Li, Jia Tan, Ping Hu, Wenjin Hunan Institute of Science and Technology Yueyang414006 China Hunan Engineering Technology Research Center for 3D Reconstruction and Intelligent Application Yueyang414006 China

The growing attention to hyperspectral object tracking (HOT) can be attributed to the extended spectral information available in hyperspectral images (HSIs), especially in complex scenarios. This potential makes it a promising alternative to traditional RGB-based tracking methods. However, the scarcity of large hyperspectral datasets pose a challenge for training robust hyperspectral trackers using deep learning methods. Prompt learning, a new paradigm emerging in large language models, involves adapting or fine-tuning a pre-trained model for downstream task by providing task-specific inputs. We propose a novel prompt learning method for HOT tasks, termed Moderate Visual Prompt for HOT (MVP-HOT). Specifically, MVP-HOT freezes the parameters of the pre-trained model and employs HSIs as visual prompts to leverage the knowledge of the underlying RGB model. Additionally, we develop a moderate and effective strategy to incrementally adapt the HSI prompt information. Our proposed method uses only a few (1.7M) learnable parameters and demonstrates its effectiveness. © 2024, The Authors. All rights reserved.

关键词： Large datasets

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design and Implementation of a Web-based Collaborative Manufacturing System Based on Knowledge Graph 4

Design and Implementation of a Web-based Collaborative Manuf...

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4th IEEE International Conference on digital Twins and Parallel Intelligence, dTPI 2024

作者： Yuan, Meng Wu, Huaiyu Shen, Zhen Han, Yunjun Zhou, Jiehan Yue, Zhijian Xiong, Gang Chinese Academy of Sciences State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Beijing100190 China University of Chinese Academy of Sciences School of Artificial Intelligence Beijing100049 China Chinese Academy of Sciences Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Dongguan523808 China Qingdao Academy of Intelligent Industries Intelligent Manufacturing Center Qingdao266109 China University of Oulu Faculty of Information Technology and Electrical Engineering OuluTS352 Finland

ISBN: (纸本)9798350349252

Collaborative manufacturing is central to agile, intelligent, and cloud-based manufacturing paradigms. This paper presents the design and implementation of a web-based collaborative manufacturing system based on a knowledge graph (KG). The system achieves the full spectrum of knowledge extraction, fusion, and reasoning across the industrial chain, thereby enhancing efficiency and reducing operational costs. The proposed system constructs an industrial chain KG and multi-agent systems, offering comprehensive digital services across the manufacturing value chain. It supports the integration of business processes, data, and standard information for enterprise groups, presenting collaborative manufacturing data of the industrial chain in real-time visualization. The paper further discusses a method for real-time perception of anomalies in the collaborative manufacturing process, utilizing expert knowledge and data-driven insights to construct an operational risk KG. The system's architecture, workflow, and functional design are detailed, along with application cases in visual dynamic management. The conclusion underscores the system's potential to improve supply-demand chain management and operational efficiency in collaborative manufacturing. © 2024 IEEE.

关键词： Smart manufacturing

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design Optimization of a 3d Microfluidic Channel System for Biomedical Applications

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3d printing and Additive Manufacturing 2024年第6期11卷 e2075-e2088页

作者： Atsani Susanto, Radita Tyas Patel, Brijesh Hsiao, Yu-Sheng Tseng, Hsiu-Yang Lin, Po Ting Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Intelligent Manufacturing Innovation Center National Taiwan University of Science and Technology Taipei Taiwan High-Speed 3D Printing Research Center National Taiwan University of Science and Technology Taipei Taiwan

Microfluidic channel systems can be used for various biomedical applications, including drug administration, wound healing, cell culture research, and many others. A 3d microfluidic channel system has enormous potential over conventional microfluidic channel systems, including the capacity to simulate biological events in a laboratory setting. This system has the ability to recreate biological phenomena such as concentration gradient generators (CGGs). Microfluidic CGGs have complex fabrication when built into a 3d channel system. These complex systems can be built with complicated processes such as plasma bonding, which requires expensive setup and fine equipment. Therefore, in this study, a smart additive manufacturing technique is applied for an enormous review of the design and fabrication process, which is optimized for different operating conditions. This study employs a 3d printed removable channel mold to avoid the complex fabrication technique of microfluidic channels, allowing the direct casting of polydimethylsiloxane without extra bonding stages. The proposed design comprises dual mixing stages, incorporating a 3d mixer configuration and a converging output to attain the desired gradient outcome. Optimization is performed to achieve the best operating conditions by using response surface methodology, with channel dimension L C and operating volumetric flow rate Q C as individual variables to minimize the gradient gap value G v a l . As a result, the optimal operating conditions are the combinations of 640 μ m channel dimensions and 242 m L ∕ h r operating volumetric flow rates, generating a stable and linear gradient value raise. A cost analysis was conducted to assess the fabrication expenses, revealing that the production cost of a sole 3d microfluidic channel is merely 1.42 USd. Copyright 2023, Mary Ann Liebert, Inc., publishers.

关键词： Cell culture

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SPA-Tracker: Spectral Prompt Adaptation for Hyperspectral Object Tracking

SPA-Tracker: Spectral Prompt Adaptation for Hyperspectral Ob...

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Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS

作者： Huang Wan Shaoxiong Xie Tian Luo Siqi Ma Lin Zhao Wen Li Wenjing Hu Hunan Institute of Science and Technology School of Information Science and Engineering Yueyang China Hunan Engineering Technology Research Center for 3D Reconstruction and Intelligent Application Hunan Institute of Science and Technology Yueyang

ISBN: (数字)9798331513139

ISBN: (纸本)9798331513146

Hyperspectral object tracking (HOT) is a crucial research area in computer vision and remote sensing. Unlike RGB-based trackers, HOT can more accurately capture the intrinsic material characteristics of objects. However, the limited number of training samples in hyperspectral datasets presents challenges for developing robust hyperspectral trackers. To tackle this issue, prompt learning is utilized to enhance spectral information in the input space while leveraging prior knowledge from foundational trackers. In this paper, we introduce a novel Spectral Prompt Adaptation Tracker (SPA-Tracker) that learns valuable prompts from hyperspectral images and adapts prompt information with hyperspectral, even when labeled training data is scarce. Compared to the baseline, SPA-Tracker includes two distinct modules: 1) A Spectral Information Prompt (SIP) module that extracts useful spectral information to enrich the input; and 2) An efficient Embedded Adapter (EA) module that facilitates learning interactions between RGB and hyperspectral features, thereby minimizing reliance on pre-trained RGB trackers. Extensive experiments demonstrate that our method achieves outstanding performance on HOT tasks.

关键词： Training Visualization Training data Signal processing Feature extraction data models Object tracking Proposals data mining Hyperspectral imaging

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Geometry Problem Solving Based on Counter-Factual Evolutionary Reasoning 19

Geometry Problem Solving Based on Counter-Factual Evolutiona...

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19th IEEE International Conference on Automation Science and engineering, CASE 2023

作者： Song, Bing Xiong, Gang Shen, Zhen Zhu, Fenghua Lv, Yisheng Ye, Peijun Institute of Automation Chinese Academy of Sciences The State Key Laboratory of Management and Control for Complex Systems Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing100049 China Institute of Automation Chinese Academy of Sciences The Beijing Engineering Research Center of Intelligent Systems and Technology China Chinese Academy of Sciences The Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing The Cloud Computing Center Dongguan523808 China Qingdao Academy of Intelligent Industries Intelligent Manufacturing Center Qingdao266000 China

ISBN: (纸本)9798350320695

As a representative topic in natural language processing and automated theorem proving, geometry problem solving requires an abstract problem understanding and symbolic reasoning. A major challenge here is to find a feasible reasoning sequence that is consistent with given axioms and the theorems already proved. Most recent methods have exploited neural network-based techniques to automatically discover eligible solving steps. Such a kind of methods, however, is greatly impacted by the expert solutions for training. To improve the accuracy, this paper proposes a new method called counterfactual evolutionary reasoning, which uses a generative adversarial network to generate initial reasoning sequences and then introduces counterfactual reasoning to explore potential solutions. By directly exploring theorem candidates rather than the neural network selection, the new method can sufficiently extend the searching space to get a more appropriate reasoning step. Through comparative experiments on the recent proposed Geometry3k, the largest geometry problem solving dataset, our method generally achieves a higher accuracy than most previous methods, bringing an overall improvement about 4.4% compared with the transformer models. © 2023 IEEE.

关键词： Geometry

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The innate interfacial elastic strain field of a transformable B2 precipitate embedded in an amorphous matrix

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npj Computational Materials 2023年第1期9卷 41-48页

作者： Xiaoling Fu Yujun Lin Mixun Zhu Kai Wang Jiaqing Wu Xing Tong Wenli Song Ming Jen Tan Yuanzheng Yang Jun Shen Gang Wang Chan Hung Shek Robert O.Ritchie School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China Songshan Lake Materials Laboratory Dongguan 523808China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore 639798Singapore School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Institute of Materials Shanghai UniversityShanghai 200444China Department of Materials Science and Engineering City University of Hong KongKowloon TongHong Kong SARChina Department of Materials Science&Engineering University of CaliforniaBerkeleyCA 94720USA

When a transformable B2 precipitate is embedded in an amorphous matrix,it is often experimentally observed that the crystalline-amorphous interface not only serves as an initiation site for the martensitic transformation due to local stress concentrations,but also as an inhibitor to stabilize the transformation,the latter being attributed to the“confinement effect”exerted by the amorphous matrix,according to the Eshelby *** two seemingly incongruous factors are examined in this study using molecular dynamics simulations from an atomic interaction *** innate strain gradient in the vicinity of the crystalline-amorphous interface is *** actual interface,the compressive/dilatative transition,and the interfacial maximum strain are investigated to differentiate from the conventional“interface”located within a distance of a few *** innate interfacial elastic strain field model is applicable for the design of materials with a higher degree of martensitic transformation and controllable stress concentration,even in cryogenic environments.

关键词： strain transformation martensitic

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Matrix stiffening promotes chondrocyte senescence and the osteoarthritis development through downregulating HdAC3

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Bone research 2024年第2期12卷 438-452页

作者： Bowen Fu Jianlin Shen Xuenong Zou Nian Sun Ze Zhang Zengping Liu Canjun Zeng Huan Liu Wenhua Huang Guangdong Medical Innovation Platform for Translation of 3D Printing Application The Third Affiliated HospitalSouthern Medical UniversityGuangzhou 510630 GuangdongChina Guangdong Engineering Research Center for Translation of Medical 3D Printing Application Guangdong Provincial Key Laboratory of Digital Medicine and BiomechanicsNational Key Discipline of Human AnatomySchool of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510145 GuangdongChina Department of Foot and Ankle Surgery Center for Orthopedic SurgeryThe Third Affiliated HospitalSouthern Medical UniversityGuangzhou 510630 GuangdongChina Department of Orthopedics Affiliated Hospital of Putian UniversityPutian 351100 FujianChina Central Laboratory Affiliated Hospital of Putian UniversityPutian 351100 FujianChina Guangdong Provincial Key Laboratory of Orthopedics and Traumatology Department of Spinal SurgeryThe First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080 GuangdongChina Nanfang Hospital Southern Medical UniversityGuangzhou 510515 GuangdongChina Guangzhou Blood Center Guangzhou 510095 GuangdongChina Department of Orthopedics The Affiliated Traditional Chinese Medicine HospitalSouthwest Medical UniversityLuzhou 646000 SichuanChina

Extracellular matrix(ECM)stiffening is a typical characteristic of cartilage aging,which is a quintessential feature of knee osteoarthritis(KOA).However,little is known about how ECM stiffening affects chondrocytes and other molecules *** study mimicked the physiological and pathological stiffness of human cartilage using polydimethylsiloxane(PdMS)*** demonstrated that epigenetic Parkin regulation by histone deacetylase 3(HdAC3)represents a new mechanosensitive mechanism by which the stiffness matrix affected chondrocyte *** found that ECM stiffening accelerated cultured chondrocyte senescence in vitro,while the stiffness ECM downregulated HdAC3,prompting Parkin acetylation to activate excessive mitophagy and accelerating chondrocyte senescence and osteoarthritis(OA)in ***,intra-articular injection with an HdAC3-expressing adeno-associated virus restored the young phenotype of the aged chondrocytes stimulated by ECM stiffening and alleviated OA in *** findings indicated that changes in the mechanical ECM properties initiated pathogenic mechanotransduction signals,promoted the Parkin acetylation and hyperactivated mitophagy,and damaged chondrocyte *** results may provide new insights into chondrocyte regulation by the mechanical properties of ECM,suggesting that the modification of the physical ECM properties may be a potential OA treatment strategy.

关键词： chondrocyte osteoarthritis stiffness

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Gender differences in ethmoid sinus morphology_ 3d reconstruction of computed tomographic images

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BMC Medical Imaging 2024年第1期24卷 1页

作者： Hsu, Chi-Pin Lin, Chih-Feng Yang, Chih-Chi Jeng, Jeng-Ywan Huang, Chang-Hung Taiwan High Speed 3D Printing Research Center National Taiwan University of Science and Technology Taipei Taiwan Department of Mechanical Engineering Ming Chi University of Technology New Taipei City Taiwan Department of Otolaryngology Head and Neck Surgery National Taiwan University Hospital Taipei Taiwan Department of Otolaryngology Taichung Tzu Chi Hospital Buddhist Tzu Chi Medical Foundation Taichung Taiwan Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei Taiwan Biomechanics Research Laboratory Department of Medical Research MacKay Memorial Hospital New Taipei City Taiwan School of Dentistry National Yang Ming Chiao Tung University Taipei Taiwan

Background: The ethmoid sinus (ES) is a three-dimensional (3d) complex structure, a clear understanding of the ES anatomy is helpful to plan intranasal surgery. However, most prior studies use 2d measurements, which may not accurately depict the 3d structure. The current study measured the gender differences in ES morphology based on 3d reconstruction of computed tomography (CT) images. Methods: The 3d models were reconstructed using CT images. Twenty-one males and 15 females were enrolled in the study. The ES dimensions, including width, height and aspect ratio (AR) of each cutting-plane section, were measured at 10% increments along with the anteroposterior axis of the ES. The gender differences in the above parameters were further evaluated by an independent t-test. Results: The width of the ES for males is 12.0 ± 2.1 mm, which was significantly greater than that in females (10.0 ± 2.1 mm). The average height for males is 18.4 ± 3.5 mm, and 18.2 ± 3.4 mm for females. The AR of female (male) is around 0.56 (0.63) for the anterior ES and 0.66 (0.75) for the posterior. There are significant differences between genders in the parameters of width and AR (p < 0.05). Conclusion: This study found that the aspect ratio greatly varies along the length of ES, indicating that the cross-section of the ES in the anterior is closer to an elliptical shape and turns closer to a circular shape near its posterior. There is a significant difference between genders in width and aspect ratio. The results would be helpful to know the complex anatomic details of the ethmoid sinus. © The Author(s) 2024.

关键词： 3d reconstruction Computed tomography Ethmoid sinus Gender difference Morphometrical analysis

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