Subjective Assessment of the Vibration Discomfort Produced by Different Hand Held Machines

1989 ◽  
Vol 8 (2) ◽  
pp. 50-61 ◽  
Author(s):  
M. Broyde ◽  
P. Donati ◽  
J. Bitsch
Keyword(s):  
Human Exposure ◽  
Subjective Assessment ◽  
Paired Comparisons ◽  
Trained Subjects ◽  
Subjective Method ◽  
Subjective Assessments ◽  
Within Subjects ◽  
Electrodynamic Vibrator ◽  
Method Of Paired Comparisons ◽  
Good Agreement

A subjective method of paired comparisons was developed to compare the discomfort caused by the vibration from hand-held power tools with the predictions obtained using the procedures recommended by standards for the evaluation of human exposure to hand-transmitted vibration. Fiteen trained subjects were exposed in the laboratory to seven different vibration exposures produced by five hand-held tools (one of the tools was used in two positions) and an electrodynamic vibrator. The good agreement observed between and within subjects shows that they can reliably rank vibration dicomfort produced by different hand-held tools. For five vibration exposures out of seven, the rank deduced from the subjective assessments was in accord with the rank of the predicted evaluations derived from the frequency-weighted acceleration values measured. An exposure with highly impulsive vibration was rated as being much more annoying than it was foreseen by the current procedures of evaluation. The operator's position proved to be an important factor in the perception of the discomfort.

Matrix of pairwise comparisons of samples in evaluation of the effect of dosed physical load on the body by

2016 ◽  
Vol 10 (1) ◽  
pp. 0-0
Author(s):  
Тен ◽  
R. Ten ◽  
Карпин ◽  
V. Karpin ◽  
Башкатова ◽  
...  
Keyword(s):  
The Body ◽  
Pairwise Comparisons ◽  
Paired Comparisons ◽  
Single Population ◽  
Rr Intervals ◽  
Trained Subjects ◽  
Classical Statistics ◽  
Before And After ◽  
Neuromuscular Systems ◽  
Method Of Paired Comparisons

The parameters of cardiovascular and neuromuscular systems in untrained and trained subjects by the methods of classical statistics in terms of the influence of physical activity are examined. A new method of matrices of pairwise comparisons of samples, which allows to evaluate the effect of exercise on the human body is proposed. Calculation of matrices of pairwise comparisons of samples of trained subjects before and after exer-cise showed a decrease in the number of random pairs of samples of RR-intervals that are (pairs of) can be attri-buted to a single population, indicating a stabilizing effect of exercise. It demonstrated the feasibility of applying the method of paired comparisons matrix samples tremorograms and RR-intervals in the evaluation of the reaction of the neuromuscular and cardiovascular systems of humans to dosed physical stress.

The Role of the Angle Components in the Wings-in and Wings-out Forms of the Müller-Lyer Illusion

Perception ◽  
1996 ◽  
Vol 25 (7) ◽  
pp. 773-781 ◽  
Author(s):  
John Predebon
Keyword(s):  
Illusion Magnitude ◽  
Paired Comparisons ◽  
Lyer Illusion ◽  
Psychological Continuum ◽  
Method Of Paired Comparisons ◽  
Good Agreement

The effect of selective amputations of the angle components in the wings-in (underestimated) and wings-out (overestimated) forms of the Müller-Lyer illusion was examined in two experiments. The stimulus figures consisted of one, two, or four angles. In experiment 1 the method of paired comparisons was used to scale the figures on the psychological continuum of length, and in experiment 2 the method of reproduction was used to obtain quantitative measures of illusion magnitude. There was good agreement between the scaling and the length-reproduction measures of the illusion. The illusory effects in all figures were significant, and the extent of the underestimation and overestimation of the wings-in and wings-out figures, respectively, increased as the number of angles increased. In general, selective amputation of the angle components produced similar patterns of illusory effects in the wings-in and wings-out figures. These findings are discussed with reference to the issue of whether the two forms of the conventional (ie four-angle) Müller-Lyer illusion are similar or distinct illusion types.

Imaging correlates of successful endoscopic third ventriculostomy

2000 ◽  
Vol 92 (6) ◽  
pp. 915-919 ◽  
Author(s):  
Abhaya V. Kulkarni ◽  
James M. Drake ◽  
Derek C. Armstrong ◽  
Peter B. Dirks
Keyword(s):  
Clinical Success ◽  
Subjective Assessment ◽  
Third Ventriculostomy ◽  
Ventricular Size ◽  
Content Type ◽  
Exact Test ◽  
Subjective Assessments ◽  
Flow Void ◽  
Fine Print

Object. The goal of this study was to determine and compare imaging correlates in pediatric patients who underwent successful or failed endoscopic third ventriculostomies (ETVs). To this end, the authors measured ventricular size changes and the presence of cerebrospinal fluid (CSF) flow void in both groups of children following ETV.Methods. Images obtained in children with hydrocephalus immediately before and at least 30 days after having undergone ETV were reviewed by four independent observers (two blinded and two nonblinded). Each observer independently measured the frontal and occipital horn ratio ([FOR], a reliable and valid measure of ventricular size) and provided a subjective assessment of the presence of a flow void at the ETV site, the degree of periventricular edema, and the amount of CSF over the cerebral hemispheres.There were 29 children whose mean age was 6.6 years at the time of ETV and who had a mean postoperative follow-up period lasting 1.6 years. Postoperatively, the mean reduction in ventricular size (as measured using the FOR) was 7% (95% confidence interval [CI] 3–11%) in cases that were deemed failures (eight patients) and 16% (95% CI 12–20%) in clinically successful cases (21 patients). This reduction was significantly greater in cases of clinical success compared with those that were deemed failures (p = 0.03, t-test). There were no substantial differences between blinded and nonblinded assessments. Flow void was present in 94% of successes and absent in 75% of failures (p = 0.01, Fisher's exact test). The other subjective assessments were not significantly different between the groups of successes and failures.Conclusions. Ventricular size appears to be somewhat reduced in both groups of patients who underwent clinically successful and failed ETV; however, the reduction is significantly greater among clinically successful cases. The presence of a flow void also appears to correlate with clinical success and its absence with clinical failure.

Scaling Children's Incentives by the Method of Paired Comparisons

1960 ◽  
Vol 7 (3) ◽  
pp. 471-474 ◽  
Author(s):  
Sam L. Witryol ◽  
William F. Fischer
Keyword(s):  
Paired Comparisons ◽  
Method Of Paired Comparisons

An Investigation of Shapes for Warning Labels

1981 ◽  
Vol 25 (1) ◽  
pp. 395-399 ◽  
Author(s):  
David J. Cochran ◽  
Michael W. Riley ◽  
Eileen I. Douglass
Keyword(s):  
College Students ◽  
Binomial Test ◽  
Paired Comparisons ◽  
Warning Labels ◽  
Geometric Shapes ◽  
The Difference ◽  
Method Of Paired Comparisons

An examination was made of nineteen different geometric shapes of warning labels, using the method of paired comparisons. Sixty-six college students viewed slides of all pairs of the shapes and each time selected the shape that was the better indicator of warning. The binomial test was used to statistically test the difference between the shapes. Results showed that of the shapes tested, the triangle on its vertex (yield sign shape, ∇) was the best warning indicator.

scholarly journals Evaluation of Motion Correction Processing in Equine Bone Scintigraphy by Scheff^|^eacute;^|^rsquo;s Method of Paired Comparisons

2013 ◽  
Vol 75 (3) ◽  
pp. 369-371 ◽  
Author(s):  
Toshiro YAMAGUCHI ◽  
Yoshiro ENDO ◽  
Yasuo NAMBO ◽  
Fumio SATO ◽  
Naoki SASAKI ◽  
...  
Keyword(s):  
Bone Scintigraphy ◽  
Motion Correction ◽  
Paired Comparisons ◽  
Method Of Paired Comparisons ◽  
Equine Bone

scholarly journals Dynamic tests on a steel-joist concrete-slab floor

1980 ◽  
Vol 7 (2) ◽  
pp. 213-224 ◽  
Author(s):  
J. H. Rainer
Keyword(s):  
Impact Test ◽  
Dynamic Properties ◽  
Concrete Slab ◽  
Subjective Assessment ◽  
Dynamic Tests ◽  
Nodal Lines ◽  
Mode 2 ◽  
Detailed Evaluation ◽  
Vibration Tests ◽  
Good Agreement

Dynamic properties have been determined for a composite steel-joist concrete-slab floor using heel impact and various shaker tests. The three modes located at 7.5, 12.4, and 18.7 Hz exhibited increasing numbers of nodal lines parallel to the joists.Application of vibration annoyance criteria for footsteps indicated that the floor was unsatisfactory. These criteria, presented in CSA Standard S16.1, Appendix G, had been derived specifically for the lowest mode of the floor. Detailed evaluation of the experimental results, however, shows that mode 1 has satisfactory vibration characteristics as a result of its high damping value, whereas mode 2 is identified as unsatisfactory. This is corroborated by subjective assessment. Vibration tests from walking steps were monitored and suitably filtered. Good agreement was found between the annoyance criteria derived from the heel impact test and those for "sustained vibrations" applied to the walking tests.Based on the dynamic properties of the floor, an assessment is made regarding the effectiveness of partitions and truss bracing for reducing footstep vibrations.

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