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Results for “Task Performance and Analysis”

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At least 37 records · Page 2Linked to original sources
PubMed1991

Task variables and visual discomfort associated with the use of VDT's.

We investigated task variables that may influence the incidence of visual discomfort amongst subjects who routinely spent a proportion of their day working with visual display terminals (VDT's). A diary was kept by subjects over five consecutive working days, in which they recorded visual symptoms, the visual tasks undertaken, the amount of time spent on workbreaks, work pressure, work interest, and personal moderating factors which may have influenced the symptoms recorded. The symptoms recorded by subjects were then treated as dependent variables in multiple regression analyses with the diary findings (task-related factors) as independent variables. The incidence of some types of symptoms was significantly associated with specific categories of work tasks, personal moderating influences, work pressure, work interest, time of day, and day of week.

Adult↗
PubMed1992

A nonstationarity test for the spectral analysis of physiological time series with an application to respiratory sinus arrhythmia.

The spectral analysis of time series requires the signal to be at least weakly stationary; i.e., the mean, (co-) variance, and spectrum of the time series should not vary from segment to segment. It is commonly assumed that psychophysiological time series are not stationary. This study introduces a nonstationarity test to the psychophysiological literature, which is derived from evolutionary spectral analysis. Basically, the test consists of a double window technique in both the time and frequency domains, leading to a two-way analysis of variance for times and frequencies. In the current study, the nonstationarity test is applied to heart rate data obtained in a typical psychophysiological setting. Heart rate and respiration were measured in four age groups under four conditions--rest, paced breathing, vigilance, and reaction time. The results indicate that only few physiological time series were completely stationary. However, for every subject, and in every condition stationary stretches could be found that were long enough to apply spectral analysis. Spectral measures (power, coherence, and phase spectra) were then compared for stationary parts of the data and the total data. This comparison indicated that nonstationarity affects all spectral measures. Most importantly, Stationarity x Task Condition x Frequency Band interactions were observed for coherence and phase spectra, and there were significant interactions with age for each of the spectral indices. These findings suggest that nonstationarity may result in biased outcomes of significance tests of the effects of task manipulations on the spectral indices of cardiac time series. Thus, it was concluded that the stationarity test should be routinely applied in the spectral analysis of physiological time series. In addition, it was suggested that the nonstationarity test has an even wider range of application that might be of interest to the psychophysiologist.

Adult↗
PubMed1977

An experience with a systems approach to curriculum design.

Learning system design, based on general systems theory, is a powerful facilitator for planning and implementing programs of curriculum and instruction. Curriculum planners are directed to a practical consideration of all systems components, and an awareness of their interrelatedness. Specifically they must deal with: Problem areas or barriers to success; the need to define and choose explicit outcomes; ways to make the curriculum operational; and a specific plan for program assessment. The systems process is value free and content free. Values are generated as content is selected and fitted into the system components. Therefore the system input is a crucial factor in the quality of the system. I have attempted to share some aspects of systems methodology which were very useful in the experience of designing a program for the education of gerontological nurse practitioners.

Curriculum↗
PubMed1992

[A comprehensive assessment of the working conditions for workers in vibration-hazardous jobs].

Comprehensive evaluation of work conditions of workers of different occupational groups (bulldozer, excavator and boring machine operators, embroideresses) helped create a new parameter of occupation harmfulness evaluation: mean arithmetic value and root-mean-square digression. The main parameters of transitory disablement morbidity were found connected with the integral parameter of harmful environmental factors, which helped define the morbidity increase per 1 harmfulness grade for men and women and predict the morbidity levels of workers depending on their work conditions.

Absenteeism↗
PubMed1992

[The prevention of occupational diseases in glassware grinders].

The role is shown of a complex of hygienic measures in the prophylaxis of professional diseases of the hands of grinders--reduction of the level of morbidity and delay of the onset of symptoms. Nonobedience of hygienic regulations is the major cause of failures of prophylactic measures. The authors worked out physiological regulations of static loads and effective means of their control.

Adult↗