scholarly journals Validation of Different Filters for Center of Pressure Measurements by a Cross-Section Study

Technologies ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 68 ◽  
Author(s):  
Koltermann ◽  
Gerber ◽  
Beck ◽  
Beck
Keyword(s):  
Data Storage ◽  
Quantitative Methods ◽  
Center Of Pressure ◽  
Reference Group ◽  
Dominant Frequency ◽  
Pressure Curve ◽  
Measurement Results ◽  
Sampling Duration ◽  
Foot Position ◽  
Postural Performance

The measurement of the center of pressure (CoP) is one of the most frequently used quantitative methods for quantifying postural performance. Due to the complexity and the high biological variability of the postural control loop, a large number of different methods and parameters have been established to describe the CoP process. Furthermore, the methodological conditions such as the foot position, visual condition, sampling duration, and the data processing also have a relevant influence on the measurement results. In addition, there are various methods for recording the pressure curve, which differ in particular with regard to the filters used, the frequencies, and measurement times. The aim of the present study was the methodical comparison between different digital filters, measurement frequencies and times, and their effects on the CoP process based on a healthy reference group. The data acquisition was done with LabVIEW and the data storage was organized in a subject oriented data structure. Based on the presented results it could be seen that with a different dominant frequency in the spectrum of the group of test persons, certain filter types are required for the processing of CoP data. In the sampling range from 300 Hz to 1 kHz in the bipedal stand and 600 Hz to 1 kHz in the monopedal stand, the choice of measurement frequency had no influence on the filter result.

scholarly journals Investigation of the Correlation between Factors Influencing the Spectrum of Center of Pressure Measurements Using Dynamic Controlled Models of the Upright Stand and Subject Measurements

2020 ◽  
Vol 10 (11) ◽  
pp. 3741
Author(s):  
Jan Jens Koltermann ◽  
Heidrun Beck ◽  
Michael Beck
Keyword(s):  
Back Pain ◽  
Power Density ◽  
Quantitative Methods ◽  
Dynamic Models ◽  
Center Of Pressure ◽  
Reference Group ◽  
Upper Body ◽  
Power Density Spectrum ◽  
Density Spectrum ◽  
Pain Patients

Measuring of the center of pressure (CoP) is one of the most frequently used quantitative methods for quantifying postural performance. The aim of the study is to describe differentiation criteria in the CoP-track for the clinical picture of chronic unspecific back pain. In this study, dynamic models loaded with multi-variable controls are used to determine whether biomechanical questions for upright posture can be answered. These models are particularly well suited for investigating the kinematics and the influence of the influencing disturbance variables. These investigations are extended by power density spectrum (PSD) analyses of CoP measurements on 590 subjects with and without chronic non-specific back pain. Pain patients show an average of 0.5 Nm2 more area under the spectrum than the pain-free reference group. In the power density spectrum different frequency ranges can be assigned to specific body oscillation. Among others, the frequency range between 0.5–0.8 Hz corresponds to the hip movement. In the range around 0.2 Hz, the movements are reflected in the upper body. Patients with back pain experience less activity in certain, individual areas.

scholarly journals Development of an on-site system for measuring the low-frequency noise and complainant’s responses

2018 ◽  
Vol 37 (2) ◽  
pp. 373-384
Author(s):  
Hiroshi Sato ◽  
Jongkwan Ryu ◽  
Kenji Kurakata
Keyword(s):  
Time Trends ◽  
Sound Pressure ◽  
Low Frequency ◽  
Dominant Frequency ◽  
Pressure Level ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Measurement Results ◽  
Frequency Components ◽  
The Relationship

An on-site system for measuring low-frequency noise and complainant's responses to the low-frequency noise was developed to confirm whether the complainant suffer from the environmental noise with low-frequency components. The system suggests several methods to find the dominant frequency and major sound pressure level spectrum of the noise causing annoyance. This method can also yield a quantified relationship (correlation coefficient and percentage of response to the noise) between physical noise properties and the complainant’s responses. The advantage of this system is that it can easily find the relationship between the complainant’s response to the acoustic event of the houses and the physical characteristics of the low-frequency noise, such as the time trends and frequency characteristics. This paper describes the developed system and provides an example of the measurement results.

scholarly journals Analysis of Customer Behavior in Mobile Food Ordering Application Using UTAUT Model (Case Study: GoFood Application)

2020 ◽  
Vol 4 (01) ◽  
pp. 23-34 ◽  
Author(s):  
Berlian Maulidya Izzati
Keyword(s):  
Perceived Control ◽  
Quantitative Methods ◽  
Structural Model ◽  
Intention To Use ◽  
Model Case ◽  
Validation Data ◽  
The Social ◽  
Measurement Results ◽  
Negative Effect

One of the mobile application technologies that popular and enjoying extraordinary success in Indonesia is GoJek application. One of many services in gojek app is called go-food. Go-food provides food online service delivery that has three main users. There are merchants, gojek drivers, and customers. Many online food ordering applications have developed, and various issues have occurred, but there has not been much research on the topic. This research is using quantitative methods. Tools to get data is a questionnaire of 60 respondents. The results are validation data and structural model calculation use Smart PLS tools. From the measurement results, there are two variables that have a positive and significant effect (with a t-statistic score> 1.65) on the user's intention to use GoFood, namely the Social Influence and Perceived Control variables. There also performance expectancy, effort expectancy, and facilitating condition variables that have a negative effect (with a t-statistic score <1.65) on the user's intention to use the GoFood application.

scholarly journals Assessment of Postural Stability During an Upper Extremity Rapid, Bimanual Motor Task After Sport-Related Concussion

2020 ◽  
Vol 55 (11) ◽  
pp. 1160-1173
Author(s):  
Cameron S. Mang ◽  
Tara A. Whitten ◽  
Madeline S. Cosh ◽  
Sean P. Dukelow ◽  
Brian W. Benson
Keyword(s):  
Upper Extremity ◽  
Sports Medicine ◽  
Postural Stability ◽  
Center Of Pressure ◽  
Motor Task ◽  
Reliable Change ◽  
Healthy State ◽  
Healthy Control ◽  
Multiple Domains ◽  
Postural Performance

Context Sport-related concussion (SRC) often presents with multidimensional and subtle neurologic deficits that are difficult to detect with standard clinical tests. New assessment approaches that efficiently quantify deficits across multiple neurologic domains are needed. Objective To quantify impairments in postural movements during an assessment of rapid, bimanual motor ability in athletes within 10 days of experiencing an SRC and evaluate relationships between impairments in upper extremity and postural performance. Design Cohort study. Setting Sports medicine clinic. Patients or Other Participants Initial baseline assessments were completed for 711 athletes. Seventy-five athletes (age = 15.8 ± 3.3 years at baseline) sustained SRCs and were reassessed within 10 days. Seventy-eight athletes (age = 15.5 ± 2.0 years) completed 2 assessments in a healthy state. Main Outcome Measure(s) Athletes stood on force plates and performed a rapid, bimanual motor task, termed the object-hit task, delivered using a Kinesiological Instrument for Normal and Altered Reaching Movements endpoint robot. Measures of postural stability that quantified center-of-pressure movements and measures of upper extremity performance were used to characterize task performance. Results Performance changes across assessments were converted to reliable change indices. We observed a difference in reliable change indices values between athletes with SRC and healthy control athletes on the combined postural measures (P = .01). Using measures to evaluate the change in postural movements from the early, easier portion of the task to the later, more difficult portion, we identified the highest levels of impairment (19%–25% of the sample impaired). We also noted a difference between individuals with concussion and healthy individuals on the combined upper extremity measures (P = .003), but these impairments were largely unrelated to those identified in the postural movements. Conclusions Measurement of postural movements during the object-hit task revealed impairments in postural stability that were not related to impairments in upper extremity performance. The findings demonstrated the benefits of using assessments that simultaneously evaluate multiple domains of neurologic function (eg, upper extremity and postural control) after SRC.

scholarly journals The Olympic Games and the economic performance of the host city – the case of London 2012 against selected global cities

2020 ◽  
pp. 22-42
Author(s):  
Julia Jastrząbek
Keyword(s):  
Literature Review ◽  
Economic Performance ◽  
Quantitative Methods ◽  
Olympic Games ◽  
Reference Group ◽  
Local Economy ◽  
Economic Indicators ◽  
Global Cities ◽  
Reference Groups ◽  
The Olympic Games

The highly competitive global environment reinforces the trend to seek new investment opportunities that have various impacts on the local economy, and staging the Olympic Games is seen as one such example. The 2012 Summer Olympic Games in London have been widely discussed and investigated due to the very ambitious plans for socioeconomic and infrastructural development prompted by the Olympic legacy framework. Based on these observations, there are two main aims of this article. The first one is to evaluate London’s post-event legacy based on a literature review. The second research goal is to assess London’s economic performance compared with reference groups of global cities by using selected economic indicators. Both qualitative and quantitative methods were applied in this research, such as a critical literature review, a series of figures and tables with economic indicators and descriptive statistics. Based on the literature review and the author’s own elaborations, it can be concluded that the Olympic legacy framework and the Games themselves fostered economic and urban development, especially in East London. However, positive impacts and legacies were intermingled with several adverse effects. In turn, a comparative analysis of economic performance between London as the host city and reference groups of global cities demonstrates that, in the adopted time intervals, the dynamics of changes in applied economic indicators is relatively quite similar in groups of European, North American and Australian cities. In contrast, Asian cities, as one reference group, outperformed London and other global cities for the vast majority of the adopted time span.

scholarly journals Vibration of the Whole Foot Soles Surface Using an Inexpensive Portable Device to Investigate Age-Related Alterations of Postural Control

2021 ◽  
Vol 15 ◽  
Author(s):  
Lydiane Lauzier ◽  
Mohamed Abdelhafid Kadri ◽  
Emilie Bouchard ◽  
Kevin Bouchard ◽  
Sébastien Gaboury ◽  
...  
Keyword(s):  
Postural Control ◽  
Center Of Pressure ◽  
Aging Population ◽  
Force Platform ◽  
Portable Device ◽  
Postural Adjustments ◽  
Age Related ◽  
Combined Use ◽  
Postural Performance ◽  
Related Increase

Background: Standing on a foam surface is used to investigate how aging affect the ability to keep balance when somatosensory inputs from feet soles become unreliable. However, since standing on foam also affects the efficacy of postural adjustments, the respective contributions of sensory and motor components are impossible to separate. This study tested the hypothesis that these components can be untangled by comparing changes of center of pressure (CoP) parameters induced by standing on a foam pad vs. a novel vibration (VIB) platform developed by our team and targeting feet soles’ mechanoreceptors.Methods: Bipedal postural control of young (n = 20) and healthy elders (n = 20) was assessed while standing barefoot on a force platform through 3 randomized conditions: (1) Baseline (BL); (2) VIB; and (3) Foam. CoP Amplitude and Velocity in the antero-posterior/medio-lateral (AP/ML) directions and COP Surface were compared between conditions and groups.Findings: Both VIB and Foam increased CoP parameters compared to BL, but Foam had a significantly greater impact than VIB for both groups. Young and Old participants significantly differed for all three Conditions. However, when correcting for BL levels of postural performance, VIB-related increase of COP parameters was no longer different between groups, conversely to Foam.Interpretation: Although both VIB and Foam highlighted age-related differences of postural control, their combined use revealed that “motor” and “sensory” components are differently affected by aging, the latter being relatively unaltered, at least in healthy/active elders. The combined used of these methods could provide relevant knowledge to better understand and manage postural impairments in the aging population.

scholarly journals Influence of different factors on the RAID 0 paired magnetic disk arrays

2020 ◽  
Vol 3 (2) ◽  
Author(s):  
Nikola Davidović ◽  
Slobodan Obradović ◽  
Borislav Đorđević ◽  
Valentina Timčenko ◽  
Bojan Škorić
Keyword(s):  
Data Storage ◽  
Fault Tolerant ◽  
Cost Effective ◽  
Data Access ◽  
Secondary Memory ◽  
Storage Space ◽  
Magnetic Disks ◽  
Measurement Results ◽  
Windows Server ◽  
Space Data

The rapid technological progress has led to a growing need for more data storage space. The appearance of big data requires larger storage space, faster access and exchange of data as well as data security. RAID (Redundant Array of Independent Disks) technology is one of the most cost-effective ways to satisfy needs for larger storage space, data access and protection. However, the connection of multiple secondary memory devices in RAID 0 aims to improve the secondary memory system in a way to provide greater storage capacity, increase both read data speed and write data speed but it is not fault-tolerant or error-free. This paper provides an analysis of the system for storing the data on the paired arrays of magnetic disks in a RAID 0 formation, with different number of queue entries for overlapped I/O, where queue depth parameter has the value of 1 and 4. The paper presents a range of test results and analysis for RAID 0 series for defined workload characteristics. The tests were carried on in Microsoft Windows Server 2008 R2 Standard operating system, using 2, 3, 4 and 6 paired magnetic disks and controlled by Dell PERC 6/i hardware RAID controller. For the needs of obtaining the measurement results, ATTO Disk Benchmark has been used. The obtained results have been analyzed and compared to the expected behavior.

scholarly journals Gambaran Ketepatan Prediksi Berat Badan Bayi Lahir Dengan Perhitungan Taksiran Berat Badan Janin Berdasarkan Posisi Pengukuran Tinggi Fundus Uteri Yang Berbeda

2019 ◽  
Vol 6 (2) ◽  
pp. 73-83
Author(s):  
Innama Sakinah
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
Quantitative Methods ◽  
Fetal Weight ◽  
Height Measurement ◽  
Keywords Birth Weight ◽  
The Difference ◽  
Foot Position ◽  
First Time ◽  
Uterine Fundus

Measurement of uterine fundal height is used as an indicator of fetal growth progress by calculating fetal weight. The difference in the position of the mother when measuring uterine fundal height causes different results. The purpose of this study is to determine the accuracy of predictions of birth weight of infants by calculating the estimated fetal body weight based on different measurements of the height of the uterine fundus. This research is descriptive with quantitative methods. In this study, the population was first-time mothers in the first-quarter cm opening in the Mandiri Midwife Practice in the April-May 2018 period with certain criteria using accidental sampling techniques. The number of samples in this study were 9 respondents. Analysis of the data used is univariate. In the results of this study, most of the predictions of the accuracy of the baby's weight were born using Dare's Formula with a semi-fowler foot position of 4 (44.4), using the Jhonson formula with a semi-fowler position of 3 (33.3%). Most of the differences in the three calculation formulas for estimating fetal body weight with birth weight are Jhonso method <10-500 gr and> 90 gr, Simple TFU method <200-900 gr, and Dare's Formula <3-400 gr and> 419 gr .   Keywords              : Birth Weight Babies, Calculation of Estimated Fetal Weight, Fundal Height Measurement Position ABSTRAK   Pengukuran tinggi fundus uteri digunakan sebagai suatu indikator kemajuan pertumbuhan janin yaitu dengan cara menghitung taksiran berat badan janin. Perbedaan posisi ibu saat pengukuran tinggi fundus uteri menyebabkan perbedaan hasil. Tujuan dari penelitian ini yaitu untuk mengetahui ketepatan prediksi berat badan bayi lahir dengan perhitungan taksiran berat badan janin berdasarkna posisi pengukuran tinggi fundus uteri yang berbeda. Penelitian ini bersifat deskriptif dengan metode kuantitatif. Populasi penelitian ini adalah ibu inpartu Kala I dengan pembukaan 1 – 4 cm di Praktik Bidan Mandiri pada periode bulan April – Mei 2018 dengan kriteria tertentu dengan menggunakan teknik accidental sampling. Jumlah sampel pada penelitian ini sebanyak 9 responden. Analisa data yang digunakan yaitu univariat. Pada hasil penelitian ini sebagian besar prediksi ketepatan berat badan bayi lahir menggunakan Dare’s Formula dengan posisi kaki semi fowler sebanyak 4 (44,4), menggunakan rumus Jhonson dengan posisi semi fowler sebanyak 3 (33,3%). Sebagian besar selisih ketiga rumus perhitungan taksiran berat badan janin dengan dengan berat badan bayi lahir yaitu metode Jhonson <10-500 gr dan >90 gr, metode TFU Sederhana <200-900 gr, dan Dare’s Formula <3-400 gr dan >419 gr. Kata Kunci: Berat Badan Bayi Lahir, Perhitungan Taksiran Berat Badan Janin, Posisi Pengukuran Tinggi Fundus Uteri

scholarly journals From mandating common measures to mandating common metrics: a plea to harmonize measurement results

2021 ◽  
Author(s):  
Eiko I Fried ◽  
Edwin de Beurs
Keyword(s):  
Clinical Practice ◽  
General Population ◽  
Research Funding ◽  
Reference Group ◽  
Psychological Research ◽  
Test Results ◽  
Measurement Instruments ◽  
Measurement Based Care ◽  
Measurement Results ◽  
Using Data

Objective. There is a great variety of measurement instruments to assess similar constructs in experimental psychological research and clinical practice. This complicates the interpretation of measurement results and hampers the implementation of measurement-based care. Actions have been proposed to improve matters, such as mandating a limited set of outcome measures as a prerequisite to obtain research funding. Method. We propagate an alternative or supplementary strategy: converting test results into universally applicable common metrics. Results. Two metrics are reviewed: T scores and percentile ranks. Their calculation is explained, and their merits and shortcomings discussed using data from three common measures for depression, the CES-D, PHQ-9, and BDI-II. Conclusion. We conclude with a proposal to express test results as T scores with the general population as reference group and supplement these with percentile ranks based on data from clinical and population samples.

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