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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Yu Kumita Katsuyuki Fujii Yasuyuki Okumura Graduate Program of Mechatronics Graduate School of Science and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Nagoya Nagoya Japan

ISBN: (数字)9781728135755

ISBN: (纸本)9781728135762

Amateur radio stations, which use greater radiation power than smartphones, are expected to have a high specific absorption rate (SAR). However, few studies have explored the electromagnetic wave exposure in amateur stations. In this paper, we propose mounting a reflector on a 1.2-GHz-band monopole antenna that is mounted on a transceiver-simulating metallic case. Numerical analysis was performed through the finite-difference time-domain (FDTD) method using a simple brain-equivalent model and a numerical model of the human body. The results demonstrated that the SAR can be reduced through the proposed method without greatly altering the antenna characteristics.

关键词： Brain modeling Numerical models Transceivers Analytical models Reflector antennas Finite difference methods Antenna radiation patterns

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RRTN: An improved rapidly-exploring random tree approach for reduced processing times 11

RRTN: An improved rapidly-exploring random tree approach for...

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11th International Symposium on mechatronics and its Applications, ISMA 2018

作者： Mohammed, Hussein Jaradat, Mohammad Romdhane, Lotfi Mechatronics Graduate Program College of Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9781538610787

In this paper, we aim to improve on the processing time taken to run the Rapidly-Exploring Random Tree Star (RRT) algorithm with no regard for the path length. By restricting the area or volume in which the algorithm's nodes can be generated, a net improvement of the speed is observer. A further step is taken where the restriction is controller to either be in the form of a normal probability distribution or a uniform probability distribution. Both modifications are presented with the normal distribution resulting in significant improvements in the processing times. © 2018 IEEE.

关键词： Motion planning

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Compensated hybrid PI controllers for sampled-data controlled systems⁎

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IFAC-PapersOnLine 2018年第25期51卷 240-245页

作者： Quadros, Mariella M. Scola, Ignacio Rubio Leite, Valter J.S. Electrical Engineering Graduate Program CEFET-MG & UFSJ Belo HorizonteMG30510-000 Brazil Department of Mechatronics Engineering CEFET-MG DivinópolisMG25503-822 Brazil

In this paper we consider sampled-data systems controlled by hybrid PI controllers. In these systems, the sample time may induce some undesirable overshoot due to the postponed reset action on the control integral state, which deteriorates the performance of the closed loop by leading to output overshoot as well as to larger settling time values. We propose a methodology to compute a bounded compensating signal to be added to the control input that minimizes the overshoot and the settling time. The action of the compensating signal synchronizes the reset instants of the hybrid PI controller with the sample-time for a class of systems. The proposed methodology is tested in a laboratory setup system composed of two connected water reservoirs with capacity of 200 liters each, actioned by a variable velocity pump. The control objective is to regulate the level of the first tank and to reject disturbances. We compare the performances achieved by two different hybrid PI schemes with and without the proposed additive compensating signal. The experimental tests illustrate the performance, robustness and disturbance rejection achieved by our approach when applied to uncertain systems. © 2018

关键词： Controllers Closed loop control systems Disturbance rejection Embedded systems Hybrid systems Reservoirs (water) Sampled data control systems Compensating signal Control objectives Controlled system Laboratory set up Reject disturbances Sampled data systems Stability of hybrid systems Variable velocities

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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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A plug-in procedure for hybridization of PI controllers ⁎

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IFAC-PapersOnLine 2019年第1期52卷 892-897页

作者： Mariella M. Quadros Ignacio Rubio Scola Valter J.S. Leite Sophie Tarbouriech Electrical Engineering Graduate Program CEFET-MG & UFSJ Belo Horizonte MG 30510-000 Brazil. National University of Rosario (UNR) CIFASIS — CONICET Rosario 2000 Argentine. Department of Mechatronics Engineering CEFET-MG Divinópolis MG 25503-822 Brazil. LAAS — CNRS Université de Toulouse CNRS France.

The nonlinear action of hybrid PI controllers makes possible to achieve almost none overshot with the smallest rise time possible (for the available input energy) and a settling time almost equal to the rise time. However, all of these nice properties require changes on the control loop. Our contribution is the proposition of a plug-in control action that can be added to the classical linear PI to avoid changes in the hardware, and still achieve the same behavior of a recently introduced adaptive hybrid PI controller. Our proposal is illustrated by real-time level control experiments in a nonlinear reservoir. Performance indexes are presented to evaluate the experimental tests.

关键词： Hybrid PI controllers. Implementation. Robust control. Performance limits. Integral performance indexes

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An Improved Impedance Estimation Method Based on Power Variations in Grid-Connected Inverters

An Improved Impedance Estimation Method Based on Power Varia...

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Brazilian Power Electronics Conference, COBEP

作者： José H. Suárez Hugo M. C. Gomes Luan S. Santana Alfeu J. Sguarezi Filho Leandro L. O. Carralero Fabiano F. Costa Department of Electrical Engineering Federal University of Bahia Salvador Brazil Pos-graduate program in Mechatronics Federal University of Bahia Salvador Brazil Centre Eng. Model. Appl. Social Scien. Federal University of ABC Santo André Brazil

ISBN: (数字)9781728141800

ISBN: (纸本)9781728141817

This paper proposes an improved version of a grid-impedance estimation method based on imposed variations of active and reactive power injected by inverters into the grid. The variations cause changes in the synchronous voltage v d and current i q at the point of common coupling (PCC) between the inverter and the grid. These variations are used to calculate the grid impedance. The proposed improvement relies on a positive sequence estimator enhanced by a Fourier filter which provides harmonic rejection capability to the method. A complete evaluation of the proposed method is performed through simulations in Matlab/Simulink environment. The results show that the method notably refines the impedance computation in moderate weak grids.

关键词： Estimation Impedance Inverters Resistance Inductance Distributed power generation Reactive power

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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 eadv4921页

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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Experimental verification of UAS based battery terminal voltage collapse detection on a simple embedded platform 11

Experimental verification of UAS based battery terminal volt...

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11th International Symposium on mechatronics and its Applications, ISMA 2018

作者： Alkhawaja, Fares Koirala, Koshish Daffalla, Mirghani Kassem, Mohamad Tily, Muhammad Amin Al-Rousan, Ghaith Mukhopadhyay, Shayok Mechatronics Graduate Program American University of Sharjah P.O Box 26666 Sharjah United Arab Emirates Department of Electrical Engineering American University of Sharjah P.O Box 26666 Sharjah United Arab Emirates

ISBN: (纸本)9781538610787

This paper experimentally verifies that the Universal Adaptive Stabilization (UAS) based Li-ion battery terminal voltage collapse strategy can be implemented on a simple embedded platform i.e. microcontrollers. Due to the complex nature of Nussbaum type switching functions, it is usually assumed that using the UAS strategy with certain Nussbaum functions is very computationally intensive and requires extremely powerful computation equipment due to the small step-size requirements. However, in this paper we present the implementation and verification of a universal adaptive stabilizer, which uses a Mittag-Leffler function as a Nussbaum function, and implement it on a simple microcontroller based system, i.e. the PIC24FJ128GA010 which is a focal point in this paper. The adaptive observer has proven to be capable of tracking the terminal voltage of different batteries in several separate trials. In another set of experiments, it is shown that bypassing the low-pass filter may also provide alternate ways to detect Li-ion battery terminal voltage collapse. © 2018 IEEE.

关键词： Lithium-ion batteries

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Robust Hybrid PI Controller with a Simple Adaptation in the Integrator Reset State

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IFAC-PapersOnLine 2017年第1期50卷 1457-1462页

作者： Scola I.R. Quadros M.M. Leite V.J.S. Electrical Engineering Graduate Program CEFET-MG UFSJ Belo Horizonte MG 30510-000 Brazil Mechatronics Engineering Department CEFET-MG campus Divinópolis Divinopólis MG 35503-822 Brazil

In this paper, we consider the implementation and the robust stability analysis of a new hybrid PI controller. Two laboratory processes are used, one to control the level in water reservoir system with capacity of 200 liters, and the other to control the temperature in a continuous oven of one meter long. The robust stability analysis conditions are proposed in terms of convex optimization procedures and can be used to certify the robust closed-loop stability. The dynamics of the processes are approximated by a first order system plus delay and, because of this, a Smith predictor is jointly used with all controllers. Concerning the hybrid PI implementation, we compare the performances achieved by a classical linear PI, by a hybrid controller found in the literature and by a new hybrid controller with adaptation of the reset value. We illustrate the performance, robustness and disturbance rejection of all three controllers in a prototype by control real time tests. The achieved performance of each controller is quantified by means of typical industrial indexes. © 2017

关键词： Hybrid control Reset adaptation Robust control Time delay systems

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Design, implementation and control of dual axis self balancing inverted pendulum using reaction wheels 10

Design, implementation and control of dual axis self balanci...

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10th International Conference on Electrical and Electronics engineering, ELECO 2017

作者： Türkmen, Abdullah Korkut, M. Yusuf Erdem, Mustafa Gönül, Ömer Sezer, Volkan Mechatronics Graduate Program Istanbul Technical University Istanbul Turkey Energy Institute Istanbul Technical University Istanbul Turkey Dept. of Control and Automation Engineering Istanbul Technical University Istanbul Turkey

ISBN: (纸本)9786050107371

Inverted pendulum systems have an important place in practice for control problems due to their nonlinear structures. It is a very difficult task to control the orientation and speed of objects and robots which are free in three dimensions. These systems constitute the substructure of many advanced systems. Conventional actuators may not be used in such applications due to various limitations. Under these circumstances usage of reaction wheels come into prominence. Reaction wheel based systems are used for orienting, coordinating and balancing of spacecraft, transport systems, and other such systems. In this study, dual axis self-balancing reaction wheel based inverted pendulum system which is a basis for many complex systems has been designed, manufactured and controlled. © 2017 EMO (Turkish Chamber of Electrical Enginners).

关键词： Inverted pendulum

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