All Outputs (24)

Adaptive sliding mode attitude control of 2-degrees-of-freedom helicopter system with actuator saturation and disturbances (2023)
Journal Article

The modelling uncertainties, external disturbance and actuator saturation issues will degrade the performance and even the safety of flight. To improve control performance, this study proposes an adaptive U-model based double sliding control (UDSMC)... Read More about Adaptive sliding mode attitude control of 2-degrees-of-freedom helicopter system with actuator saturation and disturbances.

Trajectory tracking of a quadrotor using extend state observer based U-model enhanced double sliding mode control (2023)
Journal Article

This paper develops a novel U-model enhanced double sliding mode controller (UDSMC) for a quadrotor based on multiple-input and multiple-output extended-state-observer (MIMO-ESO). UDSMC is designed using Lyapunov synthesis and Hurwitz stability to no... Read More about Trajectory tracking of a quadrotor using extend state observer based U-model enhanced double sliding mode control.

An improved U-control design for nonlinear systems represented by input/output differential models with a disturbance observer (2022)
Journal Article

This paper presents a new method to calculate the inversion of the controlled linear/nonlinear dynamic plants which are described by input–output differential equation models. This new U-model-based inverter (U-inverter), cancels both system dynamics... Read More about An improved U-control design for nonlinear systems represented by input/output differential models with a disturbance observer.

Passive impedance sensing using a SAW resonator-coupled biosensor for zero-power wearable applications (2021)
Journal Article

A bio-sensing scheme, which acquires impedance information of a capacitive biosensor by using the reflected RF signal from a surface acoustic wave (SAW) resonator connected to the biosensor, is proposed. This technique requires no power to be supplie... Read More about Passive impedance sensing using a SAW resonator-coupled biosensor for zero-power wearable applications.

Disturbance-observer-based u-control (Dobuc) for nonlinear dynamic systems (2021)
Journal Article

U-model, which is a control-oriented model set with the property of generally facilitate nonlinearity dynamic inversion/cancellation, has been introduced to the Disturbance Observer-Based control (DOBC) methods to improve the performance of the nonli... Read More about Disturbance-observer-based u-control (Dobuc) for nonlinear dynamic systems.

Low-power contactless physiological sensor (2021)
Patent

A system-on-chip contactless physiological sensor (10) is provided which comprises a capacitive-sensor electrode (14) having a first capacitance (C1) and an amplifier device (18) connected to the capacitive-sensor electrode (14), the capacitive-senso... Read More about Low-power contactless physiological sensor.

U-model-based two-degree-of-freedom internal model control of nonlinear dynamic systems (2021)
Journal Article

This paper proposes a U-Model-Based Two-Degree-of-Freedom Internal Model Control (UTDF-IMC) structure with strength in nonlinear dynamic inversion, and separation of tracking design and robustness design. This approach can effectively accommodate mod... Read More about U-model-based two-degree-of-freedom internal model control of nonlinear dynamic systems.

Charge-based supercapacitor storage estimation for indoor sub-mW photovoltaic energy harvesting powered wireless sensor nodes (2019)
Journal Article

Supercapacitors offer an attractive energy storage solution for lifetime “fit and forget” photovoltaic (PV) energy harvesting powered wireless sensor nodes for internet of things (IoT) applications. Whilst their low storage capacity is not an issue f... Read More about Charge-based supercapacitor storage estimation for indoor sub-mW photovoltaic energy harvesting powered wireless sensor nodes.

Analyses of parasitic capacitance effects and flicker noise of the DAC capacitor array for high resolution SAR ADCs (2018)
Journal Article

Copyright © 2018 Inderscience Enterprises Ltd. This paper analyses the effects of parasitic capacitances of unit capacitors on the accuracy and the noise performance of the DAC capacitor array in a SAR ADC, showing that thermal noise of the array dec... Read More about Analyses of parasitic capacitance effects and flicker noise of the DAC capacitor array for high resolution SAR ADCs.

An implantable mixed-signal CMOS die for battery-powered in vivo blowfly neural recordings (2018)
Journal Article

© 2018 A mixed-signal die containing two differential input amplifiers, a multiplexer and a 50 KSPS, 10-bit SAR ADC, has been designed and fabricated in a 0.35 μm CMOS process for in vivo neural recording from freely moving blowflies where power supp... Read More about An implantable mixed-signal CMOS die for battery-powered in vivo blowfly neural recordings.

Development of an Indoor Photovoltaic Energy Harvesting Module for Autonomous Sensors in Building Air Quality Applications (2017)
Journal Article

© 2017 IEEE. A 50 mm × 20 mm × 15 mm indoor photovoltaic (PV) energy harvesting power module (IPEHPM) has been developed for powering an Internet of Things (IoT) sensor node containing a low-power CO 2 sensor for automatic building ventilation. It i... Read More about Development of an Indoor Photovoltaic Energy Harvesting Module for Autonomous Sensors in Building Air Quality Applications.

A successive approximation method to precisely measure leakage current of the rechargeable Lithium coin battery (2017)
Journal Article

© 2017 Elsevier Ltd When the rechargeable Lithium coin battery is employed as the storage component for indoor energy harvesting, the leakage current of the battery cannot be ignored, especially in ultra-low-power applications. The leakage current of... Read More about A successive approximation method to precisely measure leakage current of the rechargeable Lithium coin battery.

Determining the reliable minimum unit capacitance for the DAC capacitor array of SAR ADCs (2013)
Journal Article

The layout area of an SAR ADC is mainly occupied by its DAC capacitor array. Since there are 2 matched unit capacitors employed for a binary-weighted N-bit DAC, selecting a small unit capacitance is the key to reducing the layout area of the capacit... Read More about Determining the reliable minimum unit capacitance for the DAC capacitor array of SAR ADCs.

An output code offset-free comparator for SAR ADCs based on non-linear preamplifier and CMOS inverters (2013)
Journal Article

The Tanh transfer function of the differential pair operating in weak inversion is employed to implement the non-linear pre-amplification for the comparator of the SAR ADC. This non-linear preamplifier achieves a low gain for large input signals ther... Read More about An output code offset-free comparator for SAR ADCs based on non-linear preamplifier and CMOS inverters.

Monitoring of stem cell culture process using electrochemical biosensors (2011)
Book Chapter

Generation of spatio-temporal concentration profiles for cell culture systems: A case study in ammonia (2010)
Journal Article

Cellular behavior is influenced by micro-concentration gradients existing in their immediate spatio-environment. A practical real-time measurement system, composed of miniaturized long-lasting sensors placed within a two-dimensional bioreactor and a... Read More about Generation of spatio-temporal concentration profiles for cell culture systems: A case study in ammonia.

Modular hardware design for distant-internet embedded systems engineering laboratory (2009)
Journal Article

A novel hardware system providing remote accessible embedded system experiments of microcontroller, digital signal processor (DSP), and field-programmable gate array (FPGA) via Internet is presented. Three newly developed hardware modules for integra... Read More about Modular hardware design for distant-internet embedded systems engineering laboratory.

FPGA design and implementation for EIT data acquisition (2008)
Journal Article

OXBACT-5 was designed to meet the challenges involved in working in the intensive care hospital environment focussed particularly on thoracic imaging of patients with respiratory distress and chronic heart failure (CHF). The FPGA-based wireless LAN l... Read More about FPGA design and implementation for EIT data acquisition.

A real-time multi-channel monitoring system for stem cell culture process (2008)
Journal Article

A novel, up to 128 channels, multi-parametric physiological measurement system suitable for monitoring hematopoietic stem cell culture processes and cell cultures in general is presented in this paper. The system aims to measure in real-time the most... Read More about A real-time multi-channel monitoring system for stem cell culture process.

Neural networks for improved text-independent speaker identification (2002)
Journal Article

In this article, we consider the binary partitioned approach with pattern index information, propose an neural network array (NNA) that performs the pattern recognition task by combining the binary partitioned approach with decision trees, and verify... Read More about Neural networks for improved text-independent speaker identification.