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Meter-scale heterostructure printing for high-toughness fiber electrodes in intelligent digital apparel

Nature Communications 2025年第1期16卷 1-10页

作者： Lee, Gun-Hee Lee, Yunheum Seo, Hyeonyeob Jo, Kyunghyun Yeo, Jinwook Kim, Semin Bae, Jae-Young Kim, Chul Majidi, Carmel Kang, Jiheong Kang, Seung-Kyun Ryu, Seunghwa Park, Seongjun Medical Research Center Seoul National University Seoul South Korea Departments of Cogno-Mechatronics Engineering and Optics & Mechatronics Engineering Pusan National University Busan South Korea Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Program of Brain and Cognitive Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Department of Materials Science and Engineering Seoul National University Seoul South Korea Department of Mechanical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Chemistry Seoul National University Seoul Seoul South Korea School of Transdisciplinary Innovations Seoul National University Seoul South Korea Department of Biomedical Science College of Medicine Seoul National University Seoul South Korea Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul South Korea Department of Transdisciplinary Medicine Seoul National University Hospital Seoul South Korea

Intelligent digital apparel, which integrates electronic functionalities into clothing, represents the future of healthcare and ubiquitous control in wearable devices. Realizing such apparel necessitates developing meter-scale conductive fibers with high toughness, conductivity, stable conductance under deformation, and mechanical durability. In this study, we present a heterostructure printing method capable of producing meter-scale (~50 m) biphasic conductive fibers that meet these criteria. Our approach involves encapsulating deformable liquid metal particles (LMPs) within a functionalized thermoplastic polyurethane matrix. This encapsulation induces in situ assembly of LMPs during fiber formation, creating a heterostructure that seamlessly integrates the matrix’s durability with the LMPs’ superior electrical performance. Unlike rigid conductive materials, deformable LMPs offer stretchability and toughness with a low gauge factor. Through precise twisting using an engineered annealing machine, multiple fiber strands are transformed into robust, electrically stable meter-scale electrodes. This advancement enhances their practicality in various intelligent digital apparel applications, such as stretchable displays, wearable healthcare systems, and digital controls. © The Author(s) 2025.

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Intelligent Access Control Mechanism for Ubiquitous Applications

Intelligent Access Control Mechanism for Ubiquitous Applicat...

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International Conference on Computer and Information Science (ACIS)

作者： Tae-Hum Lim Sang-Uk Shin Department of Interdisciplinary Program of Mechatronics Engineering Pukyong National University South Korea

As computing technology becomes more pervasive and mobile services are deployed, ubiquitous applications will need flexible access control mechanisms and more suitable access control decisions. Despite the advances in access control approaches applicable to ubiquitous applications, there remain issues that impede the development of effective access control for ubiquitous applications. Amongst them are the lack of context-based models for access control, and reliance on identity or capability-based access control schemes. In this paper, we propose intelligent system using a neural network algorithm for ubiquitous applications, which extends the role based access control with context constraints. Also we apply a neural network algorithm for making access decisions.

关键词： Intelligent control Access control Neural networks Mobile computing Intelligent networks Personal digital assistants Application software Intelligent systems Permission Pervasive computing

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Performance analysis of UPS(Ultrasonic Positioning System) using DGPS

Performance analysis of UPS(Ultrasonic Positioning System) u...

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IECON 2004 - 30th Annual Conference of IEEE Industrial Electronics Society

作者： Kim, Su Yong Lee, Dong Hwal An, Hee Tae Lee, Sang Hun Koh, Young Ho Lee, Man Hyung Department of Mechanical and Intelligent Systems Engineering Pusan National University Busan Korea Republic of Department of Interdisciplinary Program in Mechatronics Pusan National University Busan Korea Republic of School of Mechanical Engineering Pusan National University Busan Korea Republic of

In this paper, the position of a mobile robot using DGPS(Differential GPS) and UPS(UItrasonic Positioning System) is measured and the performance of UPS is analyzed using DGPS. UPS is absolute positioning system using ultrasonic waves and has better performance in low price than the other absolute positioning systems. So in order to evaluate the performance, UPS is compared with the RTK(Real-Time Kinematics) method, which is of the most accurate methods in the DGPS. As a result, the possibility of using UPS can be discussed as pseudolites or pseudo-satellites in the place where GPS is not available. © 2004 IEEE.

关键词： Mobile robots

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A study of the collision detection of robot manipulator without torque sensor

A study of the collision detection of robot manipulator with...

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ICROS-SICE International Joint Conference 2009, ICCAS-SICE 2009

作者： Je, Hwan-Wook Baek, Jun-Young Lee, Min-Cheol Interdisciplinary Program in Mechatronics Pusan National University Busan Korea Republic of Department of Mechanical and Intelligent Systems Engineering Pusan National University Busan Korea Republic of School of Mechanical Engineering Pusan National University Busan Korea Republic of

ISBN: (纸本)9784907764333

In this study, we proposed the collision observer for real-time detection of collisions between service robot and unknown obstacle. In case of a mobile equipped extra manipulator such as a service robot the safety of the system in service field is very important because a collision between the manipulator and a person may damages against the one. Therefore it is required to detect the collision against the unknown obstacle and to make them safe. This paper proposes current based method to detect unexpected collision without using extra sensor such as the force/torque(F/T), tactile sensor or the visual sensor. Instead of these sensors, the collision is detected by the observer for collision. To detect the collision of the manipulator without force/torque sensor, two parameters are only required for calculation of collision observer. One is current value, the other is control input value. Because the current from the servo amplifier is generated to follow the controller command input, the current can be used for detecting the collision. After detecting the collision of robot manipulator, we can control the robot to make them safe or reduce damage. The proposed collision detection method is implemented in a light weight robot manipulator. It is confirmed that the proposed method is valid by experimental results. © 2009 SICE.

关键词： Robot applications

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Self-packaged stretchable printed circuits with ligand-bound liquid metal particles in elastomer

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Nature Communications 2025年第1期16卷 1-11页

作者： Hyeonyeob Seo Gun-Hee Lee Dong-Yeong Kim Kum Seok Nam Jiwoo Park Yeonzu Son Semin Kim Congqi Yang Seongjun Park Joonhee Won Hyunjun Kim Steve Park Jae-Young Bae Seung-Kyun Kang Jiheong Kang Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Departments of Cogno-Mechatronics Engineering Pusan National University Busan Republic of Korea Departments of Optics and Mechatronics Engineering Pusan National University Busan Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Program of Brain and Cognitive Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Medical Research Center Seoul National University Seoul Republic of Korea Department of Biomedical Sciences College of Medicine Seoul National University Seoul Republic of Korea School of Transdisciplinary Innovations Seoul National University Seoul Republic of Korea Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul Republic of Korea Department of Transdisciplinary Medicine Seoul National University Hospital Seoul South Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea KAIST Institute for NanoCentury Daejeon Republic of Korea Department of Materials Science and Engineering Seoul National University Seoul Republic of Korea Department of Chemistry Seoul National University Seoul Republic of Korea

Packaging in stretchable electronics is crucial to protect components from environmental damage while preserving mechanical flexibility and providing electrical insulation. The conventional packaging process involves multiple steps that increase in complexity as the number of circuit layers multiply. In this study, we introduce a self-packaged stretchable printed circuit board enabled by the in situ phase separation of liquid metal particles (LMPs) within various polymer matrices during solution-based printing processes. The ligand-bound LMPs (LB-LMPs), engineered to inhibit oxide growth, undergo in situ sintering, prompting vertical phase separation. This synthesis strategy not only achieves high initial conductivity of the LMPs but also encapsulates them within the polymer matrix, preventing leakage and providing electrical insulation. Our method enables multi-layer circuit printing, eliminating the need for additional activation and packaging processes. Furthermore, by integrating conductive materials into packaging layers for selective electrical conductivity, vertical interconnect accesses and conductive pads can be formed, enabling large-scale, stretchable, and leakage-free multi-layer electrical circuits and bio-interfaces.

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Guest Editorial: Special Issue on Technology Trends in Control, Robotics and Systems - For the 30th Anniversary of the Institute of Control, Robotics and Systems -

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Journal of Institute of Control, Robotics and Systems 2024年第4期30卷 295-295页

作者： Ko, Nak Yong Kang, Taesam Song, Jin Woo Lim, Myo Taeg Jo, Kang-Hyun Department of Electronic Engineering Interdisciplinary Program in IT-Bio Convergence System Chosun University Korea Republic of Department of Mechanical and Aerospace Engineering Konkuk University Korea Republic of Department of Intelligent Mechatronics Engineering Sejong University Korea Republic of School of Electrical Engineering Korea University Korea Republic of Department of Electrical Electronic and Computer Engineering University of Ulsan Korea Republic of

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Analysis of UPS (ultrasonic positioning system) using DGPS

Analysis of UPS (ultrasonic positioning system) using DGPS

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Annual Conference of Industrial Electronics Society

作者： Su Yong Kim Dong Hwal Lee Hee Tae An Sang Hun Lee Young Ho Koh Man Hyung Lee Department of Mechanical and Intelligent Systems Engineering Pusan National University Busan Korea Depatment of Interdisciplinary Program in Mechatronics Pusan National University Busan Korea School of Mechanical Engineering Pusan National University Busan Korea

ISBN: (纸本)0780387309

In this paper, the position of a mobile robot using DGPS (differential GPS) and UPS (ultrasonic positioning system) is measured and the performance of UPS is analyzed using DGPS. UPS is absolute positioning system using ultrasonic waves and has better performance in low price than the other absolute positioning systems. So in order to evaluate the performance, UPS is compared with the RTK (real-time kinematics) method, which is of the most accurate methods in the DGPS. As a result, the possibility of using UPS can be discussed as pseudolites or pseudosatellites in the place where GPS is not available.

关键词： Performance analysis Global Positioning System Robot kinematics Mobile robots Satellites Electronic mail Position measurement Ultrasonic variables measurement Uninterruptible power systems Robot sensing systems

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A study for estimating reaction force of robot arm by using PDSPO

A study for estimating reaction force of robot arm by using ...

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International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

作者： Hyun Hee Kim Sun Oh Park Jin Ho Kyung Hyun Min Do Min Cheol Lee Interdisciplinary Program in Robotics Pusan National University Busan Korea School of Mechanical Engineering Pusan National University Busan Korea Department of Robotics and Mechatronics Korea Institute of Machinery and Materials Daejeon Korea

In the industrial field, assembling parts using robot arm requires force information. Some robot arms with torque sensors are commercially available, but they are difficult to use for industrial applications due to durability problems. In addition, mounting a torque sensor on the robot arm increases manufacturing costs and complicates the structure. In this study, we apply Sliding Perturbation Observer (SPO) to 7-axis robot manipulator and estimate reaction force without using torque sensor in simulation. From the estimated perturbation, it can be determined whether the end effector of the robot manipulator will crash part of the assembly.

关键词： Manipulators Service robots Robot sensing systems Collision avoidance Observers Force

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Phase-change metal ink with pH-controlled chemical sintering for versatile and scalable fabrication of variable stiffness electronics

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Science Advances 2025年第22期11卷

作者： Simok Lee Gun-Hee Lee Inho Kang Woojin Jeon Semin Kim Yejin Ahn Choong Yeon Kim Do A Kwon Michael D. Dickey Steve Park Seongjun Park Jae-Woong Jeong School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. Medical Research Center Seoul National University Seoul 03080 Republic of Korea. Departments of Cogno-Mechatronics Engineering and Optics and Mechatronics Engineering Pusan National University Busan 46241 Republic of Korea. Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. KAIST Information and Electronics Research Institute Daejeon 34141 Republic of Korea. Research Laboratory of Electronics Massachusetts Institute of Technology (MIT) Cambridge MA 02139 USA. Department of Mechanical Engineering Massachusetts Institute of Technology (MIT) Cambridge MA 02139 USA. Department of Chemical and Biomolecular Engineering North Carolina State University (NCSU) Raleigh NC 27606 USA. Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. KAIST Institute for NanoCentury Daejeon 34141 Republic of Korea. Department of Biomedical Sciences College of Medicine Seoul National University Seoul 03080 Republic of Korea. School of Transdisciplinary Innovations Seoul National University Seoul 03080 Republic of Korea. Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul 08826 Republic of Korea. Department of Transdisciplinary Medicine Seoul National University Hospital Seoul 03080 Republic of Korea. KAIST Institute for Health Science and Technology Daejeon 34141 Republic of Korea.

Variable stiffness electronics represent the forefront of adaptive technology, integrating rigid and soft electronics in a single system through dynamic mechanical modulation. While gallium’s high modulus tuning ratio and rapid phase transitions make it ideal for transformative electronic systems (TES), its liquid-state instability, high surface tension, and unintended phase transitions during processing pose substantial challenges. Here, we introduce STiffness-Adjustable temperature-Responsive ink (STAR ink), a chemically sinterable gallium composite electronic ink designed to overcome these obstacles. STAR ink enables high-resolution (~50 micrometers) circuit patterning, large-scale batch fabrication, and three-dimensional structure coating at room temperature. Through pH-controlled chemical sintering, STAR ink–based TES exhibits exceptional mechanical tunability (tuning ratio: 1465) and electrical conductivity (2.27 × 106 siemens per meter). Demonstrated applications—from multilayered variable stiffness printed circuit boards (PCBs) matching standard PCBs’ complexity to body-temperature responsive neural probe—underscore STAR ink’s potential for reconfigurable electronics across consumer electronics and biomedical devices.

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3-D position analysis of an object using a monocular USB port camera through Java

3-D position analysis of an object using a monocular USB por...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Dong Youp Lee Chang Ho Ji Hee Kwon Ha Seung Gweon Jeong Joong Eup Keh Keun Kug Choi Chung Duk Kim Man Hyung Lee Department of Interdisciplinary Program in Mechatronics Pusan National University South Korea Department of Intelligent & Mechanical Engineering Pusan National University South Korea Aircraft Division Defense Quality Assurance Agency South Korea Ground Vehicle Division Defense Quality Assurance Agency South Korea Technical Center Samsung Techwin Plant #3 South Korea Korea Science and Engineering Foundation South Korea School of Mechanical Engineering Pusan National University busan South Korea

ISBN: (纸本)0780370902

This paper's purpose is to obtain 3-D information by using a monocular camera. This system embodies to obtain the height of an object by using a trigonometry method between a reference point of circumstance and an object. It is possible to build up a system regardless of operating system, and then set it up. A USB port camera is used everywhere without a capture board. The Internet can be used by using applet and JMF. The authors regard the camera as fixed and they have developed a real-time JPEG/RTP network camera system using UDP/IP on Ethernet.

关键词： Universal Serial Bus Cameras Java Equations Mechanical engineering Monitoring Quality assurance Humans mechatronics Aircraft

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