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Recent development in multizonal scaffolds for osteochondral regeneration

Bioactive Materials 2023年第7期25卷 122-159页

作者： Le Yu Sacha Cavelier Brett Hannon Mei Wei Department of Chemical and Biomolecular Engineering Ohio UniversityAthensOH45701USA Biomedical Engineering Program Ohio UniversityAthensOH45701USA Department of Mechanical Engineering Ohio UniversityAthensOH45701USA

Osteochondral(OC)repair is an extremely challenging topic due to the complex biphasic structure and poor intrinsic regenerative capability of natural osteochondral *** contrast to the current surgical approaches which yield only short-term relief of symptoms,tissue engineering strategy has been shown more promising outcomes in treating OC defects since its emergence in the *** particular,the use of multizonal scaffolds(MZSs)that mimic the gradient transitions,from cartilage surface to the subchondral bone with either continuous or discontinuous compositions,structures,and properties of natural OC tissue,has been gaining momentum in recent *** the latest developments in the field,this review offers a comprehensive summary of recent advances,current hurdles,and future perspectives of OC repair,particularly the use of MZSs including bilayered,trilayered,multilayered,and gradient scaffolds,by bringing together onerous demands of architecture designs,material selections,manufacturing techniques as well as the choices of growth factors and cells,each of which possesses its unique challenges and opportunities.

关键词： Multizonal scaffolds Osteochondral regeneration Fabrication Cells Growth factors

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INTEGRATION OF DIGITAL TWINS INTO VIRTUAL COMMISSIONING PRACTICES

INTEGRATION OF DIGITAL TWINS INTO VIRTUAL COMMISSIONING PRAC...

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ASME 2024 International mechanical engineering Congress and Exposition, IMECE 2024

作者： Guerra-Zubiaga, David A. Richards, Gershom Forsberg, Paul Nwachukwu, Kingsley Burroughs, Andrew Sabula, Eric Kuts, Vladimir Kennesaw State University Department of Robotics and Mechatronics Engineering MariettaGA United States Tallinn University of Technology Department of Mechanical and Industrial Engineering Estonia

ISBN: (纸本)9780791888605

The demands of manufacturing equipment often led to operating the equipment most effectively to maximize productivity or *** need for maximized operating time for the equipment has made the maintenance aspect resort to more creative means to address the risk of equipment *** failure of equipment can range in effect from producing poor quality products, hindering the manufacturing process, or endangering the workers around ***, the damage done to equipment that has malfunctioned often causes a greater loss in profit as the equipment would need to be fixed or *** knowledge gap is in how a manufacturing plant can balance good quality maintenance without hindering the operation of the equipment *** historical maintenance practice is to run scheduled maintenance breaks on the equipment, check for system variables that have been shown to correlate to a decaying system or wait for the equipment to *** Commissioning (VC), which is the practice of using a simulated model of a system to explore the potential of a system without impeding the operation of the physical system, seems to be a sound *** paper explores the potential of integrating Digital Twins, a real-time simulation of a system, into the practice of VC to gather real-time data from the manufacturing *** the ability to collect and store complex data, the algorithms used to diagnose the system would enlighten the industry to various observations of the current practice of maintaining and operating certain *** the effectiveness and potential of this new data have yet to be defined, the ability to obtain the data would prove to be a great step forward in optimizing the maintenance and operation practices within the manufacturing industry. Copyright © 2024 by ASME.

关键词： Computer aided logic design

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Merge LiDAR and High-precision Digital Map for Real-time Object Detection and GNSS Heading Calibration

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Journal of Institute of Control, robotics and Systems 2023年第4期29卷 301-307页

作者： Sim, Hongseok Baek, Seungbeom Lee, Jaewook Moon, Heechang Industrial Convergence Interdepartmental Program Autonomous Vehicle·Intelligent Robotics Hongik University Korea Republic of Mechanical and System Design Engineering Hongik University Korea Republic of

In this study, a method was proposed for correcting the object positioning error of light detection and ranging (LiDAR) due to the roll, pitch, and yaw data error of the inertial measurement unit sensor in the global navigation satellite system (GNSS) sensor by using a high-precision digital map. A real-time obstacle map was formed using Velodyne’s three-dimensional lines, VLP-32 and VLP-16. The high-precision digital map was then merged into the LiDAR map. The map obtained by combining LiDAR and high-precision digital maps did not match because of certain errors. To eliminate these errors, a method of fitting a map with high precision on the XY plane was established, and fittable criteria were determined. Algorithm verification was performed during actual driving, and errors were removed in real time. Various autonomous driving technologies can be developed using the sensor error data preprocessing process. Copyright© ICROS 2023.

关键词： Errors

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mechanical properties of graphene oxide?silk fibroin bionanofilms via nanoindentation experiments and finite element analysis

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Friction 2022年第2期10卷 282-295页

作者： Hyeonho CHO Joonho LEE Hyundo HWANG Woonbong HWANG Jin-Gyun KIM Sunghan KIM School of Mechanical Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Mechanical Engineering(Integrated Engineering) Kyung Hee UniversityGyeonggi 17104Republic of Korea Department of Mechanical Engineering POSTECHPohang 37673Republic of Korea Department of Robotics&Mechatronics.Korea Institute of Machinery&Materials Daejeon 34103Republic of Korea

Understanding the mechanical properties of bionanofilms is important in terms of identifying their *** primary focus of this study is to examine the effect of water vapor annealed silk fibroin on the indentation modulus and hardness of graphene oxide-silk fibroin(GO-SF)bionanofilms through nanoindentation experiments and finite element analysis(FEA).The GO-SF bionanofilms were fabricated using the layer-by-layer *** water vapor annealing process was employed to enhance the interfacial properties between the GO and SF layers,and the mechanical properties of the GO-SF bionanofilms were found to be affected by this *** employing water vapor annealing,the indentation modulus and hardness of the GO-SF bionanofilms can be ***,the FEA models of the GO-SF bionanofilms were developed to simulate the details of the mechanical behaviors of the GO-SF *** difference in the stress and strain distribution inside the GO-SF bionanofilms before and after annealing was *** addition,the load-displacement curves that were obtained by the developed FEA model conformed well with the results from the nanoindentation *** summary,this study presents the mechanism of improving the indentation modulus and hardness of the GO-SF bionanofilms through the water vapor annealing process,which is established with the FEA simulation models.

关键词： graphene oxide silk fibroin layer-by-layer(LbL) nanoindentation finite element analysis(FEA)

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Pose Synchronization for Semi-Autonomous Dynamic Robotic Swarms with a Passivity-Short Human Operator 49

Pose Synchronization for Semi-Autonomous Dynamic Robotic Swa...

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49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Kanazawa, Reo Murao, Toshiyuki Kawai, Hiroyuki Kanazawa Institute of Technology Graduate Program in Mechanical Engineering Ishikawa Japan Kanazawa Institute of Technology Department of Robotics Ishikawa Japan

ISBN: (纸本)9798350331820

This paper presents a pose synchronization method for semi-autonomous dynamic robotic swarms with a passivityshort human operator. In the human-robot network, a human operator sends a command signal to and receives visual information from only a part of the robotic group. In this setting, the proposed dynamic control scheme achieves not only pose synchronization of all mobile robots but also convergence to the reference pose that the human operator specifies. The main advantage of the proposed method is to guarantee convergence of not only the position but also the orientation to the reference ones in the human-robot network. Finally, we provide human-in-the-loop simulation results through the human operation using a tablet PC to illustrate the performance of the proposed control method. © 2023 IEEE.

关键词： Synchronization

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Virtual Reality Hand Tracking for Immersive Telepresence in Rehabilitative Serious Gaming 15th

Virtual Reality Hand Tracking for Immersive Telepresence in...

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15th International Conference on Social robotics, ICSR 2023

作者： Mazhar, Noaman Gaballa, Aya Pandey, Amit Kumar Cabibihan, John-John Mechanical and Industrial Engineering Department Qatar University Doha Qatar Socients AI and Robotics Toulouse France

ISBN: (纸本)9789819987146

Intelligent systems face an increasingly complex array of challenges in the rapidly evolving landscape of human-device interactions. To address these challenges, there arises a pressing need for the development of refined methods of information transfer, capable of capturing subtle nuances such as body language and tonal subtleties. The system presented in this paper is designed to highlight a novel method of refined human-device interactions and its potential impact on the medical domain. Leveraging the Oculus SDK in the Unity Game Engine alongside the Oculus VR headset, our system allows users to interact with virtual objects naturally, mirroring real-world hand movements while simultaneously promoting upper limb rehabilitation through engaging gameplay scenarios. The integration of haptic feedback enriches the immersive experience, enabling users to not only visualize but also feel their virtual interactions. The system accommodates varying levels of mobility, adapting its complexity to individual progress. Furthermore, our VR rehabilitation system has garnered positive outcomes from user assessments, demonstrating the system’s effectiveness and user satisfaction. While limited in addressing severe upper limb impairments, the system’s flexibility allows for modular improvements and broader clinical integration. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Mixed reality

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Towards Local Minima-free Robotic Navigation: Model Predictive Path Integral Control via Repulsive Potential Augmentation

Towards Local Minima-free Robotic Navigation: Model Predicti...

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2025 IEEE/SICE International Symposium on System Integration, SII 2025

作者： Fuke, Takahiro Endo, Masafumi Honda, Kohei Ishigami, Genya Keio University Space Robotics Group Department of Mechanical Engineering Yokohama223-8522 Japan Nagoya University Mobility System Group Department of Mechanical Systems Engineering Nagoya464-8603 Japan

ISBN: (纸本)9798331531614

Model-based control is a crucial component of robotic navigation. However, it often struggles with entrapment in local minima due to its inherent nature as a finite, myopic optimization procedure. Previous studies have addressed this issue but sacrificed either solution quality due to their reactive nature or computational efficiency in generating explicit paths for proactive guidance. To this end, we propose a motion planning method that proactively avoids local minima without any guidance from global paths. The key idea is repulsive potential augmentation, integrating high-level directional information into the Model Predictive Path Integral control as a single repulsive term through an artificial potential field. We evaluate our method through theoretical analysis and simulations in environments with obstacles that induce local minima. Results show that our method guarantees the avoidance of local minima and outperforms existing methods in terms of global optimality without decreasing computational efficiency. © 2025 IEEE.

关键词： Motion planning

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Ultra-flexible graphene/nylon/PDMS coaxial fiber-shaped multifunctional sensor

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Nano Research 2023年第4期16卷 5541-5547页

作者： Peddathimula Puneetha Siva Pratap Reddy Mallem Sung Cheol Park Seoha Kim Dong Hun Heo Cheol Min Kim Jaesool Shim Sung Jin An Dong-Yeon Lee Kwi-Il Park Department of Robotics and Intelligent Machine Engineering/College of Mechanical and IT Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Advanced Material Research Center Kumoh National Institute of TechnologyGumi 39177Republic of Korea School of Mechanical Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea Department of Materials Science and Engineering Kumoh National Institute of TechnologyGumi 39177Republic of Korea

The development of flexible and wearable devices is mainly required for tactile sensing;as such devices can adapt to complicated nonuniform surfaces,they can be applied to the human ***,it remains necessary to simultaneously achieve small-scale,portable,and stable developments in such ***,this work aims at fabricating a novel,lightweight,ultra-flexible,and fiber-shaped coaxial structure with a diameter of 0.51 mm using polydimethylsiloxane/graphene/nylon material,based on piezoresistive and triboelectric *** piezoresistive-based robotic-hand-controlled sensor thus realized exhibits a response time of 120 ms and a fast recovery time of 55 ***,the piezoresistive-based sensors effectively feature whisker/joystick-guided behaviors and also sense the human finger *** to the triboelectric-based selfpowered nanogenerator behavior,the resulting sensor can convert mechanical motion into electrical energy,without adversely affecting human ***,this triboelectric-based human finger sensor can be operated under different bending modes at specific ***,this multifunctional sensor is cost-effective and suitable for various applications,including robotichand-controlled operations in medical surgery,whisker/joystick motions in lightweight drone technology,and navigation with highsensitivity components.

关键词： extremely lightweight ultra-flexible piezoresistive/triboelectric sensor human-machine whisker

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Iron Loss Calculation Method Considering Slot Harmonic Components for Induction Motor Using Virtual Blocked Rotor and Transfer Learning

Iron Loss Calculation Method Considering Slot Harmonic Compo...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Lee, Ji-Hyeon Kim, Hyun-Su Park, Soo-Hwan Park, Jin-Cheol Lim, Myung-Seop Seoul Korea Republic of Dongguk University Department of Mechanical Robotics and Energy Engineering Seoul Korea Republic of

ISBN: (纸本)9798350376067

In recent times, there has been growing interest in electric motors, particularly induction motors (IMs), which do not require rare-earth materials. IMs efficiency is a critical parameter as it directly influences the overall efficiency of the system. The iron loss is a significant factor in assessing the overall efficiency of IMs. Therefore, it is crucial to make accurate predictions of iron loss during the design of IMs. Analyzing iron loss of IMs using transient analysis offers accuracy but demands high computational costs due to induced current in the rotor bars and the difference between the stator current frequency and slip frequency. Conversely, utilizing the virtual blocked rotor (VBR) for analysis reduces computational cost but decreases accuracy, because this method can match the stator current frequency and slip frequency. Thus, in this paper, we propose a method aimed at enhancing the accuracy of the VBR while retaining its advantage of lower computational cost compared to conventional transient analysis, utilizing both the VBR and transfer learning. The transfer learning is conducted using a large amount of iron loss excluding slot harmonic components derived from the VBR and a small amount of iron loss including slot harmonic components derived from transient analysis. This method enables accurate determination of iron loss including slot harmonic components with a limited dataset, thereby improving the efficiency of the IMs design process. © 2024 IEEE.

关键词： Stators

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Characteristics Evaluation of Three Balinese Bamboos as Precursor of Activated Carbon 1

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7th International Conference on Materials engineering and Nanotechnology, ICMEN 2023

作者： Negara, Dewa Ngakan Ketut Putra Nindhia, Tjokorda Gde Tirta Widiyarta, I. Made Dwijana, I. Gusti Komang Dinata, Dewa Gede Arisma Prasetiyo, Gopi Wardana, I. Dewsa Made Prayoga Hendra Wibawa, I. Wayan Ryan Arta Mechanical Engineering Department Udayana University Bali80361 Indonesia Mechanical Engineering Master Program Udayana University Denpasar80234 Indonesia

ISBN: (数字)9789819740802

ISBN: (纸本)9789819740796

Activated carbon is known as an amorphous compound that can be manufactured from carbon-containing raw materials. It has a high adsorption capacity and is widely used in a variety of fields due to its high surface area and nano-sized pore structure. The rising demand has prompted a search for low-cost, large-quantity raw materials to replace non-renewable raw materials such as coal and petroleum residues, both of which are becoming scarce. The purpose of this research is to assess three types of Balinese bamboo as raw materials for activated carbon: petung, santong, and tali bamboos. Samples were prepared by dehydrating them under the sun for 5 days, cutting them into small pieces (±1 × 1 × 1 cm), and then heating them in an electric furnace at 105 ℃ for 1 h. Samples were then observed their microstructure using an optical microscope. To determine the chemical composition, moisture, ash, volatile, and fixed carbon content of the raw materials, the sample was ground into powder and characterized using the Van Soest analysis, and termogravimetric analysis (TGA test). The results showed that tali bamboo has the highest potential to produce high-quality activated carbon due to its higher cellulose (37.97%) and lignin (32.27%) content than petung and santong bamboos;despite having the highest moisture content (11.23%), tali bamboo has a fairly high volatile (70.72%), the lowest ash content (1.41%), and the highest fixed carbon (16.64%). The microstructure shows that vascular bundles close to the epidermis are denser and smaller in size than those further away. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Activated carbon

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