Hand-skin temperature and tracking performance

Goonetilleke, Ravindra S.; Hoffmann, Errol R.

doi:10.1016/j.ergon.2008.01.009

Cited by 27 publications

(14 citation statements)

References 46 publications

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“…Note that, as was found in the experiments of Goonetilleke and Hoffmann (2008), the errors are related to the inverse of the squared effective track width. Goonetilleke and Hoffmann have suggested that the errors depend on hand tremor while traversing such a constrained path.…”

Section: Errors In Traversing the Mazesupporting

confidence: 60%

“…The increase in errors is unlikely to be due to problems of manipulating the pen, as it would be expected that the grip and control of the pen would be better at the larger sizes (Kao, 1979;Udo et al, 2000). As Goonetilleke and Hoffmann (2008) have suggested, the denominator of the error relationship may arise from tremor in the hand and wrist controlling the motion of the pen. Here the level of tremor should have remained approximately constant, so the error increases may have arisen from the variations in the width of the maze track.…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

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Effects of pen design on drawing and writing performance

2009

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Two experiments are reported with the aim of determining the effect of pen shape and size on two different types of task: drawing and writing. Experiment 1 attempted to determine the optimum shape and size of shank for ball-point pens used to perform an accurate drawing task. Twenty-seven participants used a total of nine different pens. Drawing performance was measured by having the subjects follow mazes of different size. The dependent variables were drawing movement time and drawing accuracy. The results indicate that the pen with an equivalent diameter of 8 mm had the best accuracy during drawing, even though it had the lowest speed. The results confirm the applicability and validity of the Drury tracking model for such a task. Even though users tended to prefer larger pens, their accuracy with such pens tended to be low.In a second experiment subjects performed a writing task (with no accuracy constraints) and rated their preference for types of pen. An attempt was made to determine the preferred dimensions of ball-point pens for writing in Chinese and English. A total of 36 "bare-bodied" pens and 20 Chinese subjects were used to evaluate the effects of shape, size and weight on time to write a sentence. The Writing ability, Comfort and an Overall rating were given by the subjects. The results indicate that the Chinese subjects preferred a circular shaped pen for writing in both languages. A factor analysis showed that speed, comfort and writing ability are independent parameters in pen evaluations.

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Section: Errors In Traversing the Mazesupporting

confidence: 60%

Section: Discussion Of Experimentsmentioning

confidence: 99%

Effects of pen design on drawing and writing performance

2009

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“…The model has been further verified by Goonetilleke and Hoffmann (2008) in other situations as well.…”

Section: ( ) = (2)mentioning

confidence: 97%

Superiority of Freehand Pointing

Senanayake

Goonetilleke

2013

Proceedings of the Human Factors and Ergonomics Society Annual

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There is a possibility that computer mice may be replaced with eye-gaze or touchscreen technologies. Hence, it is imperative that we investigate the effect of the type of input device in conditions having lateral constraints. A set of tracks with different levels of difficulty were tested. The type of device had little influence on movement time for ballistic steering tasks, while movement time was affected by the type of device used in visually controlled steering tasks. It was also found that resting the forearm increased movement time. Subjective evaluations indicated that control is easier with freehand pointing. Considering both comfort and performance it appears that freehand pointing, when resting the forearm, is optimal for a touchscreen.

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“…That fact is associated with the type and number of layers as well as the surface density of the materials used in the various structural elements of the glove [11]. In addition, the amount of perspiration exuded by the hand skin may increase or decrease depending on the ambient temperature, work strain (light or strenuous manual labor), and individual differences [12,13]. According to the literature, the optimum conditions inside protective gloves are RH ≤ 50% and T ≤ 33°C for light manual work and RH ≤ 80% and T ≤ 33°C for intensive manual work.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Thermal Effectiveness of Mineral Warmers for Protective Gloves Used in Cold Environments

Irzmańska¹,

Jurczyk-Kowalska²

2020

IJHT

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The objective of the study was to assess the thermal effectiveness of mineral warmers for protective gloves used in cold environments. The study material consisted of protective gloves integrated with mineral warmers, constituting chemical heating garments (CHGs). The mineral warmers differed in terms of the amount of active mineral compounds and geometry. The warmers were applied in three protective glove that met the thermal insulation requirements stipulated in the standard EN 511:2006. The thermal effects associated with glove design and mineral warmer geometry were evaluated by recording temperature changes inside gloves placed in a climatic chamber. Continuous tests were conducted for 6 h under dynamic conditions simulating the work cycle with measurement intervals of varying length under selected ambient temperatures (-15°C,-10°C, 0°C, 5°C, 10°C) and a relative humidity of 60±5%. The results were statistically evaluated using analysis of variance (ANOVA) in order to identify differences in thermal effect between the gloves depending on the type of mineral warmers, glove design, and ambient temperature of the work environment. It was found that the use of mineral warmers significantly increased the temperature inside all the studied models of protective gloves. The smallest amount of thermoactive mixture (10 g) was insufficient to maintain thermal comfort over the adopted work period of 6 h. The optimum amount of mineral compounds ensuring a good thermal effect for periods shorter than the adopted 6 h work cycle was 20 g for the proposed warmer package design.

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Hand-skin temperature and tracking performance

Cited by 27 publications

References 46 publications

Effects of pen design on drawing and writing performance

Effects of pen design on drawing and writing performance

Superiority of Freehand Pointing

Assessment of the Thermal Effectiveness of Mineral Warmers for Protective Gloves Used in Cold Environments

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