Article
Computer Science, Information Systems
Tiesong Zhao, Ying Fang, Kai Wang, Qian Liu, Yuzhen Niu
Summary: This paper introduces a Recurrent-Network-based Vibrotactile Codec (RNVC) to achieve high efficiency and low delay. By utilizing the statistical features of vibrotactile data, the codec is able to reduce the original bitrates while maintaining coding performance.
IEEE TRANSACTIONS ON MULTIMEDIA
(2023)
Article
Computer Science, Hardware & Architecture
Aishwari Talhan, Sanjeet Kumar, Hwangil Kim, Waseem Hassan, Seokhee Jeon
Summary: This paper presents a novel thimble-shape haptic display that provides multi-mode tactile feedback at fingertips. The device has the capability to generate static pressure, high-frequency vibration, and impact force using a single actuator mechanism controlled by high-speed valves. The device's softness allows for feel-through tactile feedback, enabling users to experience responses from both real objects and synthetic feedback. The combination of flexible and non-flexible silicone membrane and systematic valve control algorithms contribute to achieving rich haptic effects.
Article
Chemistry, Analytical
Kiduk Kim, Ji-Hoon Jeong, Jeong-Hyun Cho, Sunghyun Kim, Jeonggoo Kang, Jeha Ryu, Seong-Whan Lee
Summary: It is crucial to provide accurate haptic feedback, especially to the elderly and people with reduced sensation, in mobile environments such as driving automobiles and electric power wheelchairs. This study aimed to identify perceptual characteristics for haptic vibration on touch screens and propose an efficient haptic system based on these characteristics, ultimately providing practical guidelines for the development of touch screens in real-world environments.
Article
Multidisciplinary Sciences
Yuxiang Shi, Fan Wang, Jingwen Tian, Shuyao Li, Engang Fu, Jinhui Nie, Rui Lei, Yafei Ding, Xiangyu Chen, Zhong Lin Wang
Summary: The proposed self-powered, highly sensitive ET system based on TENG has potential applications in virtual reality and augmented reality systems.
Article
Chemistry, Analytical
Xiong Lu, Minxu Lin, Shouchun Wang, Xusheng Hu, Hongbin Yin, Yuxing Yan
Summary: The paper introduces a wrist-wearable tactile display system for information expression, with experiments showing that sequential stimuli in active mode have better performance. Recognition experiments demonstrate the proposed method has high recognition rates and could be beneficial for visually impaired individuals.
Article
Multidisciplinary Sciences
Tatsuki Fushimi, Kenta Yamamoto, Yoichi Ochiai
Summary: Acoustic holograms, encoding three-dimensional acoustic fields in two dimensions, are crucial for modern acoustics. The Diff-PAT platform, utilizing automatic differentiation, achieves better performance in optimizing holograms compared to traditional algorithms by only modulating the phase. This technology can be applied to a wide range of acoustic hologram applications without requiring changes to existing systems.
SCIENTIFIC REPORTS
(2021)
Article
Computer Science, Cybernetics
Yerkebulan Massalim, Damien Faux, Vincent Hayward
Summary: Designing and manufacturing distributed tactile displays is challenging due to the difficulty in packing many strong actuators in a small space. This study explores a new design that reduces the number of independently actuated degrees of freedom while maintaining the ability to decorrelate signals applied to small regions of the fingertip skin. The device consists of two independently actuated tactile arrays, allowing for global control of the correlation of waveforms stimulating these small regions.
IEEE TRANSACTIONS ON HAPTICS
(2023)
Article
Engineering, Mechanical
Jin-Tae Kim, Hee-Sup Shin, Jae-Young Yoo, Raudel Avila, Yonggang Huang, Yei Hwan Jung, J. Edward Colgate, John A. Rogers
Summary: Recent advances in haptic interfaces have provided various options for adding touch sensations to virtual and augmented reality experiences. This study investigates the vibrational dynamics induced by three main types of actuators in bilayer elastomer structures that mimic human skin. The results show that different types of actuators produce varying sensations, highlighting the importance of understanding the mechanics associated with the coupling between the actuators and the skin.
EXTREME MECHANICS LETTERS
(2023)
Review
Neurosciences
Mark D. Fletcher, Carl A. Verschuur
Summary: Cochlear implants have been successful in restoring speech perception for severely to profoundly deaf individuals, but limitations remain in understanding speech in noisy environments, locating sound sources, and enjoying music. Electro-haptic stimulation (EHS) has shown to improve speech-in-noise performance and sound localization in CI users, with potential for enhancing music perception. Further research is needed to understand the neural basis of EHS enhancement and its effectiveness across different clinical populations, as well as to optimize signal-processing strategies for future haptic neuroprosthetic devices in aiding hearing-impaired individuals.
FRONTIERS IN NEUROSCIENCE
(2021)
Article
Chemistry, Analytical
Satinder Gill, Dianne T. V. Pawluk
Summary: This paper presents a low-cost, mobile tactile display design combined with robotic assistance/guidance to aid blind or visually impaired individuals in exploring tactile graphics. The system allows smooth unlimited movements in a 2D plane with sufficient position and orientation accuracy. Preliminary semi-structured interviews suggest that the system is easy to use and potentially useful for tactile exploration of virtual diagrams.
Article
Chemistry, Multidisciplinary
Yichen Zhai, Zhijian Wang, Kye-Si Kwon, Shengqiang Cai, Darren J. Lipomi, Tse Nga Ng
Summary: The development of haptic actuators is trending towards using organic materials and additive printing technologies to achieve distributed signals over large areas. By combining the advantages of organic materials and digital printing technologies, haptic devices that are ergonomic and cost-effective can be obtained.
ADVANCED MATERIALS
(2021)
Article
Psychology, Multidisciplinary
Yusuke Ujitoko, Scinob Kuroki
Summary: This study investigates the effectiveness of presenting spatial information through a remote vibrotactile array, which is placed at a distance from the body. The experiment shows that humans can recognize the direction of the vibration source, but not the distance. The accuracy of direction recognition varies with the vibration source direction and frequency, suggesting the need for calibration of stimulus direction and the recommendation of using high frequency for accurate direction presentation.
FRONTIERS IN PSYCHOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Ludovico Cestarollo, Shane Smolenski, Amal El-Ghazaly
Summary: Haptics enables tactile interactions between humans and digital interfaces. Magnetorheological elastomers (MREs) have the potential to create a tactile interface that can recreate 3D shapes sensed by touch. By using nanoparticles instead of microparticles, MREs can achieve higher deflection and performance. Isotropic MREs with soft magnetic nanoparticles show better performance due to the soft magnetic nature of the nanoparticles. On the other hand, anisotropic MREs with larger particles can achieve greater deflection.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Biomedical
Andrea Marinelli, Nicolo Boccardo, Michele Canepa, Dario Di Domenico, Marianna Semprini, Michela Chiappalone, Matteo Laffranchi, Lorenzo De Michieli, Strahinja Dosen
Summary: The bidirectional communication between the user and the prosthesis is crucial in developing prosthetic hands. This study proposes a novel solution to encode wrist rotation using a vibromotor array and Gaussian interpolation of vibration intensity, and systematically evaluates its performance.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Taha Moriyama, Hiroyuki Kajimoto
Summary: This study introduces a novel tactile device that transfers tactile information from the fingers to the back, enhancing the user's perception of object shapes.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Electrical & Electronic
Dinesh Elayaperumal, Young Hoon Joo
Summary: This paper investigates the swarm formation control problem of multiple nonholonomic wheeled mobile robots. A coordinate control scheme based on the leader-follower approach is developed to achieve swarm formation. The sliding mode controller and neural dynamics model are introduced to track and maintain the desired formation. The simulation results demonstrate the effectiveness of the proposed controller.
JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Sathishkumar Moorthy, Young Hoon Joo
Summary: This paper investigates the formation control problem for multiple nonholonomic wheeled mobile robots using distributed estimators and a biologically inspired approach. The proposed methodology includes adaptive trajectory tracking control for the leader robot, distributed estimators for each follower robot, distributed formation tracking control laws based on the estimators, and a bioinspired controller to address velocity jump problem. The stability of the closed-loop system is analyzed using Lyapunov stability theory, and simulation results demonstrate the effectiveness of the proposed methods.
JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY
(2023)
Review
Energy & Fuels
Ganesh Mayilsamy, Kumarasamy Palanimuthu, Raghul Venkateswaran, Ruban Periyanayagam Antonysamy, Seong Ryong Lee, Dongran Song, Young Hoon Joo
Summary: The accurate modeling, control, and monitoring of interface systems and energy conversion systems are critical to the reliability and performance of the power system. PMSG-based WTS with full-rated converter significantly contributes to the development of renewable energy generation. State estimation is an ideal and reliable procedure in the control of the entire WTS, reducing the effects of noise and revealing hidden variables. However, there is a lack of analysis and summary of the strategies for real-time information of operating variables in PMSG-based WTS.
Review
Thermodynamics
Junbo Liu, Dongran Song, Qingan Li, Jian Yang, Yang Hu, Fang Fang, Young Hoon Joo
Summary: This review provides a macro perspective on the composition of wind power's whole life cycle, economic analysis methods, and cost modeling processes. It discusses the differences in cost composition and modeling among different types of wind farms and the applicability of economic analysis methods and evaluation indicators. The paper explores the relationship between life cycle and investment, as well as potential methods to improve the accuracy and reliability of life cycle economic assessment. Discussions are made on the future development and potential improvements of whole life cycle cost modeling and economic analysis of wind power. Comparisons are also made in terms of modeling methods, evaluation indicators, uncertainty analysis methods, and prediction methods.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Automation & Control Systems
Young Hoon Joo, Ruban Antonysamy, Thirumoorthy Ramasamy, Seong Ryong Lee
Summary: This study discusses the power maximization and dc-link voltage regulation problems of a permanent magnet vernier generator (PMVG)-based wind energy conversion system. The proposed sliding-mode control scheme achieves maximum power extraction and stable dc link voltage.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Subramanian Kuppusamy, Young Hoon Joo
Summary: This article investigates the switched fault-tolerant tracking control techniques for a permanent magnet synchronous generator (PMSG)-based variable-speed wind energy conversion system (WECS) subject to actuator faults. The proposed fault-tolerant tracking control effectively tracks the optimal trajectory of the system states under known and unknown actuator faults. Stabilization conditions and H-infinity performance index are derived to enhance system performance.
INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Raghul Venkateswaran, Anto Anbarasu Yesudhas, Seong Ryong Lee, Young Hoon Joo
Summary: This paper investigates the control strategy for extracting stable output power and regulating DC-link voltage in a permanent-magnet vernier generator (PMVG)-based wind turbine system (WTS). An integral sliding mode controller (ISMC) is presented for the machine-side converter (MSC) to maximize output power, and a grid-side converter (GSC) is also designed to protect the DC-link and maintain steady output power. The exponential reaching law is employed to ensure stable output power during various wind speed conditions.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Energy & Fuels
Yuxiang Ying, Pengfei Ying, Hong Men, Young Hoon Joo
Summary: In this paper, a novel scheme combining an improved YOLOv5s model and image registration algorithms is proposed to detect and locate module faults in mountain-mounted PV plants. Experimental results show that the proposed scheme can effectively identify faults and accurately locate faults in MPVs.
Article
Automation & Control Systems
Subramanian Kuppusamy, Young Hoon Joo
Summary: This study proposes a nonparallel distribution compensation (PDC) control method for PMSG-based wind energy conversion systems (WECS). By expressing the nonlinear PMSG-based WECS as a Takagi-Sugeno (T-S) fuzzy system, a general non-PDC control strategy is designed via a T-S fuzzy observer. The observer is used to estimate the unmeasurable states of the system, and sufficient conditions are obtained to ensure the stability of the system.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2023)
Article
Mathematics, Applied
Lakshmanan Shanmugam, Young Hoon Joo
Summary: This paper presents a method for designing adaptive neural networks based on integral sliding mode control for delayed Takagi-Sugeno fuzzy systems with external disturbances. The stability conditions are derived based on suitable Lyapunov functionals using generalized free-weight matrix-based inequality. The resulting conditions ensure asymptotic stability with H infinity attenuation level and the reachability condition is achieved under the adaptive radial basis function neural networks based on the sliding mode controller.
APPLIED MATHEMATICS AND COMPUTATION
(2023)
Article
Thermodynamics
Dongran Song, Xiao Tan, Xiaofei Deng, Jian Yang, Mi Dong, M. H. Elkholy, M. Talaat, Young Hoon Joo
Summary: Efficient power generation and reduced operational cost are crucial for wind energy. This study proposes a hybrid REWS prediction framework that combines mechanism analysis, data-driven techniques, and Lidar measurements. The framework initially predicts REWS through mechanism modeling and time delay analysis, and then improves accuracy using a residual prediction model based on data-driven techniques. The proposed method enhances the performance of wind turbines by improving REWS prediction accuracy.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Computer Science, Artificial Intelligence
Dongran Song, Ziqun Li, Xiaofei Deng, Mi Dong, Lingxiang Huang, Jian Yang, Mei Su, Younghoon Joo
Summary: Because wind direction is time-varying, yaw is a common state of wind turbines. To improve energy capture and reduce the usage of yaw actuators, a Model Predictive Control (MPC) method based on Fuzzy Deduction Weight Coefficient Evaluator (FDWE) is proposed. The FDWE dynamically adjusts the weight coefficient connecting the objectives of energy capture loss ratio and yaw actuator usage ratio in MPC based on predicted wind direction. Three different strategies are proposed to optimize the fuzzy rule and membership function as part of this complex optimization problem. The results show that the optimized FDWE-MPC using these strategies improves energy capture and reduces yaw actuator usage, indicating promise in reducing production costs for wind turbines.
EXPERT SYSTEMS WITH APPLICATIONS
(2023)
Article
Automation & Control Systems
Ruban Periyanayagam Antonysamy, Seong Ryong Lee, Sang Yong Jung, Young Hoon Joo
Summary: This study proposes a robust sliding mode approach-based current control scheme for the machine side converter and grid side converter of a grid-connected permanent magnet vernier generator (PMVG). The proposed scheme improves steady-state and transient performance, reduces total harmonic distortion in grid current, and enhances power quality. Simulation and experimental results demonstrate the effectiveness of the proposed controller compared to conventional methods.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Raghul Venkateswaran, Seong Ryong Lee, Young Hoon Joo
Summary: This paper proposes a stability augmentation scheme using the e1 adaptive scheme for pitch angle control in a PMSG-based wind turbine system with pitch actuator uncertainty. This scheme regulates the pitch angle and maintains the rated rotor speed in the presence of pitch actuator uncertainties. The proposed e1 adaptive scheme is applied to a non-affine PMSG system with uncertainties for variable-speed WTS. The stability and performance of the proposed scheme are proven through bound conditions.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Subramanian Kuppusamy, Young Hoon Joo
Summary: This paper proposes novel stabilization criteria for a nonlinear permanent magnet synchronous generator (PMSG)-based wind turbine system (WTS) with sampled-data information under uncertainty and controller gain variations. The nonlinearity in the PMSG-based WTS is modeled using Takagi-Sugeno (T-S) fuzzy systems. A novel looped-type asymmetric augmented Lyapunov-Krasovskii functional (LKF) is developed by taking advantage of the variable characteristic related to the sampling pattern. The dynamic delay partition method is used for the non-fragile sampled-data control design of the T-S fuzzy systems, and the less conservative stabilization criteria are obtained in the form of linear matrix inequality.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)