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Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)

作者： Basil Alattar Mehdi Ghommem Mohamed Hemid Departement of Mechanical Engineering American University of Sharjah Sharjah UAE Mechatronics Graduate Program American University of Sharjah Sharjah UAE

In this paper, we analyze the dynamic response of a MEMS device made of a microplate supported by two microcantilever beams and electrically actuated via an underneath electrode. We employ the motion-induced current method to capture its dynamic response under varying pressure. We show the potential use of the MEMS device as a pressure sensor by leveraging squeeze-film damping and other nonlinear dynamic phenomena associated with its motion. The present study reveals the possible tuning of the MEMS device to operate in analog and binary modes. Analog-based detection is achieved within the low pressure range of 2.2-52 mbar. We also demonstrate the use of the MEMS device in binary mode, acting as a pressure switch, with a capability to detect low pressures down to sub-millibars.

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Design of LPV-PI-like controller with guaranteed performance for discrete-time systems under saturating actuators ⁎

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IFAC-PapersOnLine 2020年第2期53卷 3898-3903页

作者： Larissa S. Figueiredo Társis A.R. Parreiras Márcio J. Lacerda Valter J.S. Leite Graduate Program in Electrical Engineering - CEFET / MG & UFSJ Department of Electrical Engineering /Federal University of São João del-Rei (UFSJ) Department of Mechatronics Engineering / CEFET-MG / campus Divinópolis

This paper presents new conditions to design linear parameter-varying (LPV) state-feedback controllers for systems under saturating actuators. The proposed design ensures a minimal rate of contractivity of an associated Lyapunov function. A proportional-integral (PI) like structure is employed to ensure null tracking error for piecewise constant reference signals. Therefore, this proposal fits the design requirements of LPV and quasi-LPV real systems under saturating actuators. Experimental essays conducted on a second-order nonlinear level control illustrate the potential of the proposed approach. Additionally, the tests indicate how the contractivity rate affects the size of the estimate of the region of attraction.

关键词： LPV controller quasi-LPV systems PI like controller saturating actuators

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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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Building A Face Database Of Arab Faces Toward Evaluating Bias In Facial Analysis Systems 17

Building A Face Database Of Arab Faces Toward Evaluating Bia...

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17th International Conference on Interfaces and Human Computer Interaction 2023, IHCI 2023, the 17th International Conference on Computer Graphics, Visualization, Computer Vision and Image Processing 2023, CGVCVIP 2023 and 16th International Conference on Game and Entertainment Technologies 2023, GET 2023

作者： Khalil, Ashraf Glal, Suha Ahmed, Khider Khan, Sana Zeb Abdulgani, Aysha College of Technological Innovation Zayed University Abu Dhabi United Arab Emirates Mechatronics Engineering Graduate Program American university of Sharjah Sharjah United Arab Emirates Department of Computer Science and Engineering American university of Sharjah Sharjah United Arab Emirates United Arab Emirates University Al Ain United Arab Emirates

ISBN: (纸本)9789898704498

Machine learning algorithms are fundamentally driven by the data provided by humans;consequently, the decisions made by those algorithms are not free from human bias. This is particularly evident in the case of facial analysis systems that employ machine learning algorithms. Recent studies have shown that the decisions made by many of the commercially available facial analysis systems are prejudiced against certain groups of race, ethnicity, age, gender and culture. Further studies have identified that the underlying reason for such biased decisions is that the open source material available for facial image databases which are used in commerce and academia to train the algorithms has meager diversity in these categories. To compound this issue, facial analysis technology is promoted by influential companies and artificial intelligence service providers without affirming the fairness and accuracy of the decisions given by these systems. To minimize bias and ensure representation of the Middle Eastern population in the imminent growth of this technology, we propose the development of two Arab face databases along with an algorithmic audit involving seven commercially available facial analysis systems. Of the databases, the first, Arab-LEANA, will include 300 Arab subjects' face images with variation in lighting, expression, accessory, nationality and age (LEANA). The second, Arab Public Figures Faces (APFF), will contain images and videos of 300 Arab public figures captured "in the wild". Faces for APFF will be selected manually from the internet since manual selection of faces will result in a high degree of variability in scale, pose, expression, illumination, age, occlusion and make-up. These databases will provide the worldwide community of face recognition researchers with a large-scale, diverse collection of Arab face images for training and evaluating algorithms toward developing a more representative, and therefore more robust, capacity for facial analysis. T

关键词： Machine learning

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Improving Control Theory Education Through Face-to-Face Implementation of a Mobile Robotics Methodology

Improving Control Theory Education Through Face-to-Face Impl...

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2024 Brazilian Symposium on Robotics (SBR), and 2024 Workshop on Robotics in Education (WRE)

作者： M. A. Pastrana William Humberto Cuéllar Sánchez Jose Mendoza-Peñaloza M. S. Santana Daniel M. Muñoz Department of Mechanical Engineering Mechatronics Graduate Program University of Federal District UDF Brasilia DF Brazil Faculty of Gama Electronics Engineering Undergraduate Program University of Brasilia Brasilia DF Brazil

ISBN: (数字)9798350391084

ISBN: (纸本)9798350391091

Advances in information and communication technologies have significantly transformed engineering education. Virtual laboratories are increasingly adopted to enhance student interaction with control system simulations. The improved visualization and interaction capabilities of modern computers offer a more organic way to teach theoretical foundations. This paper describes the implementation of a methodology for teaching control theory that until now was entirely online in a face-to-face environment at the University of the Federal District in Brasilia, Brazil. This methodology utilizes virtual laboratories with CoppeliaSim, MATLAB, and the EVA mobile robot to teach control theory focused on single-input, single-output (SISO) systems for mobile robot tracking and obstacle avoidance applications. The results of the face-to-face implementation are compared to those of the fully online methodology, revealing that in-person teaching significantly enhances the quality of instruction.

关键词： Visualization mechatronics Educational robots SISO Education Laboratories Software Control theory Mobile robots MATLAB

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Multi-robot Map Exploration Based on Multiple Rapidly-Exploring Randomized Trees

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SN Computer Science 2024年第1期5卷 31页

作者： Mukhopadhyay, Shayok Umari, Hassan Koirala, Koshish Electrical & Computer Engineering and Computer Science Department University of New Haven 300 Boston Post Rd West Haven 06516 CT United States Department of Electrical Engineering American University of Sharjah Sharjah P.O. Box 26666 United Arab Emirates Mechatronics Engineering graduate program American University of Sharjah Sharjah P.O. Box 26666 United Arab Emirates

A map is necessary for tasks such as path planning or localization, which are common to mobile robot navigation. However, a map may be unavailable if the environment in which a robot navigates is unknown. Creating a map requires an exploration algorithm. Such algorithms guide robots to boundaries that separate known portions of a map from the unknown portions. Such boundaries are known as frontiers. There are image processing-based algorithms that detect frontiers. The authors’ previous work uses two, i.e., local and global, rapidly exploring random trees (RRTs) for two-dimensional exploration using a single robot. The present work applies the above to a multiagent system with three robots. A market-based strategy is used to allocate exploration tasks to the robots. Results show that the developed exploration strategy successfully explores a map in a reasonable amount of time compared to image processing-based approaches, and also reduces the map exploration cost. This strategy is readily usable for three-dimensional exploration with drones. It is also shown that the usage of a local frontier detector along with a global frontier detector helps reduce exploration time compared to simply using a global frontier detector alone. As an outline to future work, the paper also shows an extension of the proposed approach towards three-dimensional mapping using a single robot. © 2023, The Author(s), under exclusive licence to Springer Nature Singapore Pte Ltd.

关键词： Exploration Mapping Multi-agent Navigation ROS RRT

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Indoor robot localization by RSSI/IMU sensor fusion

Indoor robot localization by RSSI/IMU sensor fusion

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Veerachai Malyavej Warapon Kumkeaw Manop Aorpimai Department of Control Instrumentation and Mechatronics Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand The Electrical Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand

Localization is the crucial problem for mobile robot navigation. For indoor mobile robot, since a global positioning system (GPS) is incapable, another promising technique to detect the position is the received signal strength indicator (RSSI) from wireless communication. To improve the precision and robustness of mobile unit localization, an inertial measurement unit (IMU) is normally used. In this report, we propose the algorithm for mobile robot localization based on sensor fusion between RSSI from wireless local area network (WLAN) and an IMU. The proposed fusion scheme is based on the extended Kalman filter (EKF). The experiment is conducted by using mobile unit equipped with low-cost IMU and a wireless communication module together with access points to evaluate the performance of our algorithm, and the result is promising.

关键词： Robot sensing systems Noise Mobile communication Wireless communication Mathematical model Sensor fusion Kalman filters

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Largely deformable surface electrode based on PDMS for cortical recording and stimulation

Largely deformable surface electrode based on PDMS for corti...

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International IEEE/EMBS Conference on Neural engineering, CNE

作者： Namsun Chou Soonki Yoo Sohee Kim School of Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Faculty of the school of Mechatronics and Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea

This paper describes a largely deformable surface electrode based on poly-dimethylsiloxane (PDMS) substrate, including its fabrication, electrochemical characterization, adhesion test, and bending test results. The fabricated electrode is made of both PDMS and parylene C layers, which are completely attached to each other. Between the two parylene layers gold patterns are located in the mechanical neutral plane. In the fabrication process, PDMS is supported by parylene layer when the metal layer is sputter deposited, resulting in no cracks. The electrode provides highly deformable neural electrode structure with mechanical integrity and electrical stability. With these advantages, it is expected to be suitable in stable neural recording and stimulation.

关键词： Electrodes Adhesives Substrates Metals Impedance Impedance measurement

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Implementation of VR-based personal basketball team-practice equipment

Implementation of VR-based personal basketball team-practice...

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IEEE Global Conference on Life Sciences and Technologies (LifeTech)

作者： Hiroki Honma Yoshiaki Iida Yasuyuki Okumura Katsuyuki Fujii Yuki Kuno Graduate Program of Mechatronics Graduate School of Science and Engineering Nanzan University Nagoya Japan Physical Education Center Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Nagoya Japan

ISBN: (数字)9781665418751

ISBN: (纸本)9781665448086

In basketball, the next motion can be instantaneously determined with an accurate understanding of the surrounding conditions. Therefore, it is necessary to develop the ability to judge a situation accurately and perform appropriate actions. Development of such decision-making ability in individual practice can lead to higher efficiency. The purpose of this study is to construct an environment closely resembling interpersonal practice by arranging players in a virtual space using VR technology. As this device is used for practice, the sense of distance from the VR player is important. Hence, this study measures the error between VR players and users.

关键词： Performance evaluation Space technology Image edge detection Conferences Measurement uncertainty Decision making Life sciences

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Parameter Identification of DC Motor Drive Systems using Particle Swarm Optimization

Parameter Identification of DC Motor Drive Systems using Par...

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International Conference on engineering and Emerging Technologies (ICEET)

作者： Ishaq Hafez Rached Dhaouadi Mechatronics Engineering Graduate Program College of Engineering American University of Sharjah Sharjah United Arab Emirates College of Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9781665427159

Accurate parameter estimation is of increasing importance in system modeling and control of highperformance motor drive systems. The inaccurate calculation or assumption of the system modal parameters may cause instability and/or bias control performance. This work presents the mathematical modeling, simulation, and experimental study to estimate the mechanical parameters of a two-mass-model system in DC motor drives using Artificial Swarm Intelligence. The electrical parameters such as resistance and inductance are usually provided by the DC motor manufacturer. However, the mechanical parameters such as the moment of inertia, and viscous friction will vary when the motor is connected to a mechanical load for a given application. Computer modeling and parameter estimation of the system were carried out using MATLAB/Simulink software. The parameters estimation of the mechanical side of a DC Motor drive system will be converted into an optimization problem using an objective function. The standard PSO algorithm is compared to the proposed modified PSO algorithms in the literature.

关键词： Chaos Motor drives Parameter estimation Heuristic algorithms Software algorithms DC motors Search problems

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