Kyoung Kwan Ahn
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View article: Direct vs. Indirect Charge Transfer: A Paradigm Shift in Phase-Spanning Triboelectric Nanogenerators Focused on Liquid and Gas Interfaces
Direct vs. Indirect Charge Transfer: A Paradigm Shift in Phase-Spanning Triboelectric Nanogenerators Focused on Liquid and Gas Interfaces Open
Triboelectric nanogenerators (TENGs) have emerged as a promising technology for harvesting mechanical energy via contact electrification (CE) at diverse interfaces, including solid–liquid, liquid–liquid, and gas–liquid phases. This review …
View article: Energy consumption reduction technologies in hybrid hydraulic construction machine: A review
Energy consumption reduction technologies in hybrid hydraulic construction machine: A review Open
View article: Performance Evaluation of Beluga Whale Optimization–Long Short-Term Memory–Random Forest Networks for Trajectory Control and Energy Optimization in Excavator Systems
Performance Evaluation of Beluga Whale Optimization–Long Short-Term Memory–Random Forest Networks for Trajectory Control and Energy Optimization in Excavator Systems Open
Over the past few years, reducing energy consumption in hydraulic excavators has gained increasing attention, driving significant research in this field. One effective strategy involves integrating hydrostatic transmission (HST) and hydrau…
View article: Adaptive neural observer-based output feedback anti-actuator fault control of a nonlinear electro-hydraulic system with full state constraints
Adaptive neural observer-based output feedback anti-actuator fault control of a nonlinear electro-hydraulic system with full state constraints Open
View article: Hybrid powertrain with dual energy regeneration for boom cylinder movement in a hydraulic excavator
Hybrid powertrain with dual energy regeneration for boom cylinder movement in a hydraulic excavator Open
View article: Adaptive disturbance observer-based terminal sliding mode algorithm for a Mini excavator proton exchange membrane fuel cell air feeding system
Adaptive disturbance observer-based terminal sliding mode algorithm for a Mini excavator proton exchange membrane fuel cell air feeding system Open
View article: A Finite-Time Disturbance Observer for Tracking Control of Nonlinear Systems Subject to Model Uncertainties and Disturbances
A Finite-Time Disturbance Observer for Tracking Control of Nonlinear Systems Subject to Model Uncertainties and Disturbances Open
In this study, a finite-time disturbance observer (FTDOB) with a new structure is originally put forward for the motion tracking problem of a class of nonlinear systems subject to model uncertainties and exogenous disturbances. Compared to…
View article: Implementing PSO-LSTM-GRU Hybrid Neural Networks for Enhanced Control and Energy Efficiency of Excavator Cylinder Displacement
Implementing PSO-LSTM-GRU Hybrid Neural Networks for Enhanced Control and Energy Efficiency of Excavator Cylinder Displacement Open
In recent years, increasing attention has been given to reducing energy consumption in hydraulic excavators, resulting in extensive research in this field. One promising solution has been the integration of hydrostatic transmission (HST) a…
View article: Assessment of a Hybrid Wind–Wave Energy Converter System in Nearshore Deployment
Assessment of a Hybrid Wind–Wave Energy Converter System in Nearshore Deployment Open
A modeling technique for a nearshore hybrid wind–wave energy converter system (HWWECS) is presented in this research. The model consists of the buoy, wind system, and generator, allowing simulation of the HWWECS’s behavior in response to v…
View article: Experimental Investigation of a Point Absorber Wave Energy Converter Using an Inertia Adjusting Mechanism
Experimental Investigation of a Point Absorber Wave Energy Converter Using an Inertia Adjusting Mechanism Open
This study proposes a novel point absorber wave energy converter (WEC) utilizing an inertial adjusting mechanism for performance evaluation. A conceptual design is introduced to explain the WEC’s functionality. Adjustable masses are incorp…
View article: An Enhanced Extremum Seeking-Based Energy Management Strategy with Equivalent State for Hybridized-Electric Tramway-Powered by Fuel Cell–Battery–Supercapacitors
An Enhanced Extremum Seeking-Based Energy Management Strategy with Equivalent State for Hybridized-Electric Tramway-Powered by Fuel Cell–Battery–Supercapacitors Open
This article proposes a novel real-time optimization-based energy management strategy (EMS) for proton membrane exchange fuel cell (PEMFC)-battery-supercapacitors-driven hybridized-electric tramways (HETs). The proposed algorithm is derive…
View article: Adaptive neural tracking control for flexible joint robot including hydraulic actuator dynamics with disturbance observer
Adaptive neural tracking control for flexible joint robot including hydraulic actuator dynamics with disturbance observer Open
In this paper, a disturbance observer‐based adaptive neural backstepping integral sliding mode control (BISMC) is developed for a flexible joint robot (FJR) with the integration of an adjustable stiffness rotary actuator (ASRA). This syste…
View article: A novel observer-based neural-network finite-time output control for high-order uncertain nonlinear systems
A novel observer-based neural-network finite-time output control for high-order uncertain nonlinear systems Open
Due to the difficulty encountered in dealing with unstructured system dynamics with unmeasured system state variables, this paper presents a novel observer-based neural network finite-time output control strategy for general high-order non…
View article: Adaptive Extended State Observer for the Dual Active Bridge Converters
Adaptive Extended State Observer for the Dual Active Bridge Converters Open
The DC–DC dual active bridge (DAB) converter has become one of the essential units for bidirectional energy distribution and connecting various renewable energy sources. When it comes to regulating the converter’s output voltage, integrati…
View article: Self-Powered Flow Rate Sensing via a Single-Electrode Flowing Liquid Based Triboelectric Nanogenerator
Self-Powered Flow Rate Sensing via a Single-Electrode Flowing Liquid Based Triboelectric Nanogenerator Open
Recently, triboelectric nanogenerators (TENGs) have emerged as having an important role in the next wave of technology due to their large potential applications in energy harvesting and smart sensing. Recognizing this, a device based on TE…
View article: Development of a Hardware-in-the-Loop Platform for a Teleoperation Flexibility Robotic System
Development of a Hardware-in-the-Loop Platform for a Teleoperation Flexibility Robotic System Open
A control method for a cable-driven robot in a teleoperation system is proposed using the hardware-in-the-loop (HIL) simulation technique. The main components of the teleoperated robotic system are a haptic device, also called a delta robo…
View article: Flowing Liquid-Based Triboelectric Nanogenerator Performance Enhancement with Functionalized Polyvinylidene Fluoride Membrane for Self-Powered Pulsating Flow Sensing Application
Flowing Liquid-Based Triboelectric Nanogenerator Performance Enhancement with Functionalized Polyvinylidene Fluoride Membrane for Self-Powered Pulsating Flow Sensing Application Open
Pulsating flow, a common term in industrial and medical contexts, necessitates precise water flow measurement for evaluating hydrodynamic system performance. Addressing challenges in measurement technologies, particularly for pulsating flo…
View article: Adaptive Disturbance Observer-Based Terminal Sliding Mode Algorithm for a Mini Excavator Proton Exchange Membrane Fuel Cell Air Feeding System
Adaptive Disturbance Observer-Based Terminal Sliding Mode Algorithm for a Mini Excavator Proton Exchange Membrane Fuel Cell Air Feeding System Open
View article: Disturbance Attenuation-Based Global Integral Sliding Mode Control of an Electro-Hydraulic System With Prescribed Performance
Disturbance Attenuation-Based Global Integral Sliding Mode Control of an Electro-Hydraulic System With Prescribed Performance Open
The uncertainties and external disturbances inevitably reduce the displacement tracking efficiency of an electro-hydraulic system (ELHS). In this paper, the design of observer-based global integral sliding mode control is proposed for an e…
View article: Working Performance Improvement of a Novel Independent Metering Valve System by Using a Neural Network-Fractional Order-Proportional-Integral-Derivative Controller
Working Performance Improvement of a Novel Independent Metering Valve System by Using a Neural Network-Fractional Order-Proportional-Integral-Derivative Controller Open
In recent years, reducing the energy consumption in a hydraulic excavator has received deep attention in many studies. The implementation of the novel independent metering valve system (NIMV) has emerged as a promising solution in this reg…
View article: Extended Sliding Mode Observer-Based Output Feedback Control for Motion Tracking of Electro-Hydrostatic Actuators
Extended Sliding Mode Observer-Based Output Feedback Control for Motion Tracking of Electro-Hydrostatic Actuators Open
This paper develops a novel output feedback control scheme for the motion-tracking problem of an electro-hydrostatic actuator (EHA) in the presence of model uncertainties and external disturbances. Firstly, a simplified third-order system …
View article: Investigation and Optimization of Energy Consumption for Hybrid Hydraulic Excavator with an Innovative Powertrain
Investigation and Optimization of Energy Consumption for Hybrid Hydraulic Excavator with an Innovative Powertrain Open
This paper presents an innovative powertrain design and an energy regeneration system for hybrid hydraulic excavators to reduce energy consumption and emissions. The proposed system is designed to maximize engine efficiency and make full u…
View article: Nonlinear Functional Observer Design for Robot Manipulators
Nonlinear Functional Observer Design for Robot Manipulators Open
In this paper, a nonlinear functional observer (NFO) is first proposed for the control design of robot manipulators under model uncertainties, external disturbances, and a lack of joint velocity information. In principle, the proposed NFO …
View article: Innovative powertrain and advanced energy management strategy for hybrid hydraulic excavators
Innovative powertrain and advanced energy management strategy for hybrid hydraulic excavators Open
This paper presents an innovative powertrain managed by an advanced energy management strategy for hybrid hydraulic excavators to improve the overall energy efficiency. Here, a main pump is driven via a planetary gear by an engine and an e…
View article: Authors Index
Authors Index Open
View article: A novel adaptive neural network-based time-delayed estimation control for nonlinear systems subject to disturbances and unknown dynamics
A novel adaptive neural network-based time-delayed estimation control for nonlinear systems subject to disturbances and unknown dynamics Open
This paper presents an adaptive backstepping-based model-free control (BSMFC) for general high-order nonlinear systems (HNSs) subject to disturbances and unstructured uncertainties to enhance the system tracking performance. The proposed m…
View article: High Output Direct-Current Nanogenerators Based on Charge Redistribution at Wet Cellulose/Metal Contact Interfaces
High Output Direct-Current Nanogenerators Based on Charge Redistribution at Wet Cellulose/Metal Contact Interfaces Open
In the present work, a wet cellulose sponge-based direct-current electric generator (WCS-DCEG) is proposed, which offers a new power generation methodology for harvesting mechanical energy through an extremely simple structure. The device …
View article: Recent Progress in Self-Powered Sensors Based on Liquid–Solid Triboelectric Nanogenerators
Recent Progress in Self-Powered Sensors Based on Liquid–Solid Triboelectric Nanogenerators Open
Recently, there has been a growing need for sensors that can operate autonomously without requiring an external power source. This is especially important in applications where conventional power sources, such as batteries, are impractical…
View article: Adaptive Synchronization Sliding Mode Control for an Uncertain Dual-Arm Robot with Unknown Control Direction
Adaptive Synchronization Sliding Mode Control for an Uncertain Dual-Arm Robot with Unknown Control Direction Open
In this paper, an adaptive synchronization sliding mode control is proposed for a dual-arm robot against parameter variations, external disturbance, and unknown control directions. The proposed control is designed by using cross-coupling e…
View article: The Effect of a Magnetic Field on Solid–Liquid Contact Electrification for Streaming Flow Energy Harvesting
The Effect of a Magnetic Field on Solid–Liquid Contact Electrification for Streaming Flow Energy Harvesting Open
In recent years, the triboelectric nanogenerator (TENG) has been recognized as a promising method for energy harvesting and self-powered devices. However, in order to improve the output efficiency of the TENG, it is necessary to change the…