Forward head posture (FHP) is representative bad habit causing neck pain, shoulder pain, back pain, dental occlusion, headache etc in modern society. Approaches to prevent FHP were researched by camera sensors such as Kinect and Webcam, which has cost and space limitation caused by installation of the sensors. To compensate the limitations, we proposed wearable device to put it behind user’s ea...

Digital s y s t e m s design and verif ication becomes m o r e dijgicult a s the s ize of t he s y s t e m grows. T o solve th,is problem, m a n y CAD tools have been developed, including s imu la t ion . However , as s y s t e m s increase in size and complexi ty , s imu la t ing the s y s t e m becomes v e r y costly, both in t i m e and space. For m o s t cases tha t u s e s imu la t ion , o...

One precondition for direct sensor orientation with GPS and IMU is the correct sensor calibration. The related parameters as well as the relation between the IMU and the aerial camera (boresight misalignment) have to be determined by conventional bundle block adjustment. During this process a camera self calibration (focal length, principal point, additional parameters etc.) may be performed un...

We present an approach to wearable sensor-based assessment of functional ability (FA) of individuals post stroke. We make use of one on-body inertial measurement unit (IMU) to automate the FA scoring of the Wolf Motor Function Test (WMFT). WMFT is an assessment instrument used to determine the functional capabilities of individuals post stroke. It comprises of 17 tasks15 of which are rated acco...

The proposed system exploits Wi-Fi and GeoMagnetic fingerprintings aided by Inertial Measurement Unit (IMU). Basically, the system only consists of the off-the-self Wi-Fi Access Points (APs) and low-cost IMU, while no extra equipment is required. Since the accuracy of Wi-Fi fingerprinting heavily depends on the number of APs deployments, spatial differentiability, and the fluctuation of Receive...

In this research, a new Map/INS/Wi-Fi integrated system for indoor location-based service (LBS) applications based on a cascaded Particle/Kalman filter framework structure is proposed. Two-dimension indoor map information, together with measurements from an inertial measurement unit (IMU) and Received Signal Strength Indicator (RSSI) value, are integrated for estimating positioning information....

Dual-frequency Global Positioning System (GPS) Real-time Kinematics (RTK) has been proven in the past few years to be a reliable and efficient technique to obtain high accuracy positioning. However, there are still challenges for GPS single-frequency RTK, such as low reliability and ambiguity resolution (AR) success rate, especially in kinematic environments. Recently, multi-Global Navigation S...

We utilize an array of wireless inertial measurement units (IMUs) to measure the movements of subjects (n=30) traversing an outdoor balance beam (zigzag and sloping) as quickly as possible both with and without load (20.5kg). Our objectives are: (1) to use IMU array data to calculate metrics that quantify performance (speed and stability) and (2) to investigate the effects of load on performanc...

Three dimensional data is in great demand for the various applications. In order to represent 3D space in details, it is indispensable to acquire 3D shape and texture together efficiently. However, there still lack a reliable, quick, cheap and handy method of acquiring three dimensional data of objects at higher resolution and accuracy in outdoor and moving environments. In this research, we pr...

In this paper, we summarize the results of using dynamic models borrowed from tracking theory in describing the time evolution of the state vector to have an estimate of the angular motion in a gyro-free inertial measurement unit (GF-IMU). The GF-IMU is a special type inertial measurement unit (IMU) that uses only a set of accelerometers in inferring the angular motion. Using distributed accele...