Automated recognition of worker activities has the potential in aiding quick assessment of labour productivity on construction sites. A novel method called accelerometer based activity recognition has been investigated and preliminary results show that it has good potential for deployment in construction environment. The major decisive factor influencing the performance of the activity recognit...

In this study, a novel user-independent method to recognize activities accurately in situations where traditional accelerometer based classification contains a lot of uncertainty is presented. The method uses two recognition models: one using only accelerometer data and other based on sensor fusion. However, as a sensor fusionbased method is known to consume more battery than an accelerometer-b...

BACKGROUND Currently, little is known about physical activity patterns in pregnancy with prior estimates predominantly based on subjective assessment measures that are prone to error. Given the increasing obesity rates and the importance of physical activity in pregnancy, we evaluated the relationship and agreement between subjective and objective physical activity assessment tools to inform re...

BACKGROUND Different types of devices are available and the choice about which to use depends on various factors: cost, physical characteristics, performance, and the validity and intra- and interinstrument reliability. Given the large number of studies that have used uniaxial or triaxial devices, it is of interest to know whether the different devices give similar information about PA levels a...

OBJECTIVES To investigate the biological, social, behavioural and environmental factors associated with non-consent, and non-return of reliable accelerometer data (≥2 days lasting ≥10 h/day), in a UK-wide postal study of children's activity. DESIGN Nationally representative prospective cohort study. SETTING Children born across the UK, between 2000 and 2002. PARTICIPANTS 13 681 7 to 8-yea...

Force producer is one of the core components of a Wire Suspended Micro-Pendulum Accelerometer; and the stability of permanent magnet in the force producer determines the consistency of the acceleration sensor's scale factor. For an assembled accelerometer; direct measurement of magnetic field strength is not a feasible option; as the magnetometer probe cannot be laid inside the micro-space of t...

–Mechatronics is one of the promising trends in the era of computing in today’s system automation industry and control. The proposed project is one such attempt of designing an accelerometer based system to communicate with an industrial robotic arm wirelessly. This project comprises of design and implementation of the robotic arm powered with Cortex–M3 based LPC1768 core. The core has to be in...

The correlation between objective and self-reported measures of physical activity varies between studies. We examined this association and whether it differed by demographic factors or socioeconomic status (SES). Data were from 3,975 Whitehall II (United Kingdom, 2012-2013) participants aged 60-83 years, who completed a physical activity questionnaire and wore an accelerometer on their wrist fo...

BACKGROUND This study was designed to develop a prediction algorithm that would allow the Previous Day Physical Activity Recall (PDPAR) to be equated with temporally matched data from an accelerometer. METHODS Participants (n = 121) from a large, school-based intervention wore a validated accelerometer and completed the PDPAR for 3 consecutive days. Physical activity estimates were obtained f...

Acceleration, an important dynamic parameter, is used widely in researching on aircraft mechanical structure fatigue, shock and so on, as it is in proportion to force and load. Piezoelectric sensor is a kind of sensor that most widely used in measuring acceleration, is also called acceleration sensor or accelerometer, because its impulse response is excellent and is suitable for measuring shock...