Improved Rapid Magnitude Estimation for a Community‐Based, Low‐Cost MEMS Accelerometer Network

2015 ◽  
Vol 105 (3) ◽  
pp. 1314-1323 ◽  
Author(s):  
Angela I. Chung ◽  
Elizabeth S. Cochran ◽  
Anna E. Kaiser ◽  
Carl M. Christensen ◽  
Battalgazi Yildirim ◽  
...  
Keyword(s):  
Magnitude Estimation ◽  
Low Cost ◽  
Community Based ◽  
Mems Accelerometer

Low-cost MEMS accelerometer network for rotating machine vibration diagnostics

2020 ◽  
Vol 23 (7) ◽  
pp. 25-33
Author(s):  
Luciane Agnoletti dos Santos Pedotti ◽  
Ricardo Mazza Zago ◽  
Mateus Giesbrecht ◽  
Fabiano Fruett
Keyword(s):  
Low Cost ◽  
Vibration Diagnostics ◽  
Mems Accelerometer ◽  
Machine Vibration ◽  
Rotating Machine

Pedometer-Determined Step-Count Guidelines for Afterschool Programs

2012 ◽  
Vol 9 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Michael W. Beets ◽  
Aaron Beighle ◽  
Matteo Bottai ◽  
Laura Rooney ◽  
Fallon Tilley
Keyword(s):  
Operating Characteristic ◽  
Low Cost ◽  
Vigorous Physical Activity ◽  
Area Under The Curve ◽  
High Specificity ◽  
Step Count ◽  
Afterschool Programs ◽  
Policy Goal ◽  
Community Based ◽  
Random Intercept

Background:Policies to require afterschool programs (ASPs, 3 PM to 6 PM) to provide children a minimum of 30 minutes of moderate-to-vigorous physical activity (MVPA) exist. With few low-cost, easy-to-use measures of MVPA available to the general public, ASP providers are limited in their ability to track progress toward achieving this policy-goal. Pedometers may fill this gap, yet there are no step-count guidelines for ASPs linked to 30 minutes of MVPA.Methods:Steps and accelerometer estimates of MVPA were collected concurrently over multiple days on 245 children (8.2 years, 48% boys, BMI-percentile 68.2) attending 3 community-based ASPs. Random intercept logit models and receiver operating characteristic (ROC) analyses were used to identify a threshold of steps that corresponded with attaining 30 minutes of MVPA.Results:Children accumulated an average of 2876 steps (standard error [SE] 79) and 16.1 minutes (SE0.5) of MVPA over 111 minutes (SE1.3) during the ASP. A threshold of 4600 steps provided high specificity (0.967) and adequate sensitivity (0.646) for discriminating children who achieved the 30 minutes of MVPA; 93% of the children were correctly classified. The total area under the curve was 0.919. Children accumulating 4600 steps were 25times more likely to accumulate 30 minutes of MVPA.Conclusions:This step threshold will provide ASP leaders with an objective, low-cost, easy-to-use tool to monitor progress toward policy-related goals.

scholarly journals Fault Diagnosis of Industrial Gear Hobbing Machine

2020 ◽  
Vol 9 (3) ◽  
pp. 2039-2043
Keyword(s):  
Fault Diagnosis ◽  
Low Cost ◽  
Market Competition ◽  
Vibrational Analysis ◽  
High Quality ◽  
Mems Accelerometer ◽  
Spectral Kurtosis ◽  
Vibration Data ◽  
Gear Hobbing ◽  
Dynamic Time

The aim of this paper is to develop a fault diagnosis algorithm by vibrational analysis for an industrial gear hobbing machine. Gear Hobbing is the most dominant and profitable process for manufacturing high quality gears. In order to sustain the market competition gear manufacturers, need to produce high quality gears with minimum possible cost. However, catastrophic failures do occur in gear hobbing process which causes unexpected machine down time and revenue loss. These failures can be avoided by using condition monitoring approaches. In the proposed approach vibration data during different faults such as lubrication error, excessive feed rate, loose bearing error is collected from an industrial gear hobbing machine using three axis MEMS accelerometer. The collected data is analyzed and classified with spectral kurtosis and Dynamic Time Warping algorithm. The efficiency of the proposed approach is 90 percent as determined by experimental results. The proposed approach can provide a low-cost solution for predictive maintenance for gear hobbing industries..

scholarly journals Assessment of visual acuity defects among rural adolescent students of tribal Bastar Chhattisgarh (India)

2018 ◽  
Vol 5 (10) ◽  
pp. 4335
Author(s):  
Alakh Ram Verma ◽  
Teeku Sinha ◽  
Gagandeep Singh Bhatia
Keyword(s):  
Visual Acuity ◽  
Low Cost ◽  
Refractive Errors ◽  
Community Based ◽  
Cross Sectional ◽  
Female Ratio ◽  
Adolescent Students ◽  
Eye Screening ◽  
Male To Female ◽  
Rural Adolescent

Background: Defective visual acuity is the most common problem among adolescents which, if remains uncorrected may cause refractive errors and may lead to blindness. Defective visual acuity can be tested early and corrected by spectacles. The objectives of the study were assessment of visual acuity defects among adolescent students.Methods: Present study design is cross sectional community based study. Conducted during July to September 2017 in Higher Secondary School, Pandripani. Predesigned KAP questionnaires were used to collect information and visual acuity was measured by using Snellen’s chart. Students with spectacles were tested for uncorrected and corrected visual acuity. Data was analyzed on MS Excel 2016.Results: Visual acuity defect prevalence rises with age and maximum is seen in age group 19-20 years (85%).Male to female ratio in students with defects was 52:48 Maximum defect is seen in class 12th students (34%).83% students never got their eyes checked out of which 25% had defective visual acuity. Positive attitude toward spectacles preventing normalization of eyes and spectacles leading to dependence and worsening of vision were elicited. Students whose parents have eye related problem have prevalence of 64%.83% of students advised to wear spectacles who don’t have, cost of spectacle is most common cause (80%) and is preceded by not much difference in vision after wearing (20%).Conclusions: The prevalence of visual acuity defect was high in rural adolescent. Eye screening of school going children is recommended and spectacles to be distributed free or at low cost to those students diagnosed with refractive errors.

scholarly journals Housing for Aboriginal Youth in the Inner City of Winnipeg

2020 ◽  
Vol 3 (2) ◽  
pp. 56-64 ◽  
Author(s):  
Jason Brown ◽  
Dilly Knol ◽  
Sonia Prevost-Derbecker ◽  
Kelly Andrushko
Keyword(s):  
Child Welfare ◽  
Child Neglect ◽  
Homeless Youth ◽  
Life Experiences ◽  
Low Cost ◽  
Aboriginal Peoples ◽  
Community Based ◽  
Low Cost Housing ◽  
The City

Aboriginal families are highly overrepresented in child welfare caseloads. Major reasons for these high rates of involvement include poverty and housing issues, which contribute to perceptions of child neglect. In Winnipeg, the city with the highest proportion of Aboriginal peoples in Canada, low-cost housing is concentrated in core neighbourhoods. Homeless youth in these neighbourhoods, who are involved or have been involved in child welfare, were asked about their life experiences and the kind of housing that would help them. They talked about the need to be seen as resourceful, contributing members of the community, as well as their continued need of support from others, including friends and family. They wanted more than a place to sleep; they wanted a home that was safe, nurturing and long-term. The youth had school and work aspirations for themselves and wanted to help other youth reach their goals. There is a need for expansion of community-based and community-driven housing with youth who have been involved in the child welfare system.

scholarly journals Affordable stroke therapy in high-, low- and middle-income countries: From Theradrive to Rehab CARES, a compact robot gym

2017 ◽  
Vol 4 ◽  
pp. 205566831770873 ◽  
Author(s):  
Michelle Jillian Johnson ◽  
Roshan Rai ◽  
Sarath Barathi ◽  
Rochelle Mendonca ◽  
Karla Bustamante-Valles
Keyword(s):  
Stroke Rehabilitation ◽  
Low Cost ◽  
Lessons Learned ◽  
Stroke Therapy ◽  
Robot Assisted ◽  
Community Based ◽  
Middle Income ◽  
Middle Income Countries ◽  
The Usa ◽  
Improve Access

Affordable technology-assisted stroke rehabilitation approaches can improve access to rehabilitation for low-resource environments characterized by the limited availability of rehabilitation experts and poor rehabilitation infrastructure. This paper describes the evolution of an approach to the implementation of affordable, technology-assisted stroke rehabilitation which relies on low-cost mechatronic/robot devices integrated with off-the-shelf or custom games. Important lessons learned from the evolution and use of Theradrive in the USA and in Mexico are briefly described. We present how a stronger and more compact version of the Theradrive is leveraged in the development of a new low-cost, all-in-one robot gym with four exercise stations for upper and lower limb therapy called Rehab Community-based Affordable Robot Exercise System (Rehab C.A.R.E.S). Three of the exercise stations are designed to accommodate versions of the 1 DOF haptic Theradrive with different custom handles or off-the-shelf commercial motion machine. The fourth station leverages a unique configuration of Wii-boards. Overall, results from testing versions of Theradrive in USA and Mexico in a robot gym suggest that the resulting presentation of the Rehab C.A.R.E.S robot gym can be deployed as an affordable computer/robot-assisted solution for stroke rehabilitation in developed and developing countries.

Identification of Vibration Parameters of Mechanical System Utilizing Low-Cost MEMS Accelerometers

2019 ◽  
Vol 894 ◽  
pp. 1-8
Author(s):  
Khanh Duong Quang ◽  
Huong Vuong Thi ◽  
Anh Luu Van
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Damping Ratio ◽  
Vibration Reduction ◽  
Mechanical Systems ◽  
Micro Electro Mechanical Systems ◽  
Mems Accelerometer ◽  
System Parameters ◽  
Mems Accelerometers ◽  
Vibration Parameters

Multi-axial mechanical systems commonly encounter the problem of vibration while attempting to drive machining systems at high speed. Many effective methods based on feed-forward and feedback control have been proposed and applied for vibration reduction. In order to design controllers all methods require the exact knowledge of system parameters: vibration frequency and damping ratio. In recent years, low-cost Micro Electro Mechanical Systems (MEMS) accelerometers have been used for many applications in industry. This paper presents the advantage of low cost MEMS accelerometer to identify vibration parameters of mechanical systems in comparison to conventional expensive devices.

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