Kay-Soon Low

Learn More
Foot clearance above ground is a key factor for a better understanding of the complicated relationship between falls and gait. This paper proposes a wearable system using UWB transceivers to monitor the vertical heel/toe clearance during walking. First, a pair of very small and light antennas is placed on a point approximating to the heel/toe of the foot,(More)
This paper proposes a wearable system using UWB transceivers to measure the knee flexion/extension angle parameter, who is known to be of clinical importance. First, a pair of very small and light antennas is placed on the adjacent segments of knee joint. Then, the range data between these two antennas is acquired using Time of Arrival (TOA) estimator. We(More)
This paper presents a new highly accurate gait phase detection system using wearable wireless ultrasonic sensors, which can be used in gait analysis or rehabilitation applications. The gait phase detection system uses the foot displacement information during walking to extract the following gait phases: heel-strike, heel-off, toe-off, and mid-swing. The(More)
In this paper, an ultrasonic-based system for foot parameters measurement has been proposed and investigated. An extended Kalman filtering-based methodology has been developed to extract foot parameters including step length, stride length and cycle time from horizontal displacement during walking. The system comprises of one ultrasonic transmitter (mobile)(More)
In this paper, an odd-harmonic repetitive control scheme with phase lead compensation is proposed for CVCF PWM converters. The proposed repetitive controller that combines an odd-harmonic periodic generator with a poles-zeros-cancellation phase lead filter occupies less data memory that a conventional repetitive controller does. And it offers faster(More)
This paper presents a digital hardware oriented system that uses a genetic algorithm (GA) for optimizing a pattern classifier based on the pulsed neural network (PNN). The scheme avoids the usage of multipiers and dividers, which are the bottlenecks for digital hardware implementation of parallel computations like GA and neural networks. Utilizing the(More)
For a hard disk drive servo system, there are multiple control objectives to be met simultaneously. While some of the objectives are constraint objectives, some of them are simply optimization objectives. In this paper, we describe a new approach for tuning the controller parameters such that the resultant servo system can perform and meet all the(More)
Transformer based Z-source inverters have attracted more attention recently due to the advantages of reduced component count and its maximized use of the modulation index. In this paper, a new type of dual transformer based Z-source inverter is proposed. It uses two Γ-source networks mirroring each other to form the sigma network. The proposed(More)
Lithium ion batteries have become the preferred choice for many applications due to their high energy density and low self-discharge rate. State-of-charge (SOC) information is required in many applications to optimize and safeguard the performance of the batteries. Different methods of SOC estimation such as Ampere counting and model-based estimation have(More)
This paper introduces a novel method for arm flexion/extension angles measurement using wireless ultrasonic sensor network. The approach uses unscented Kalman filter and D-H kinematical chain model to retrieve the joint angles. This method was experimentally validated by calculating the 2-dimensional wrist displacements from one mobile, placed on the point(More)
  • 1