Browsing by Subject "Task Performance"
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Item Open Access The effects of color temperature on performance and mood of users : a color task implementation model(Bilkent University, 2017-07) Kürkçü, EsraThis study aimed to explore the effects of color temperatures on color task performance, and also to propose a color task implementation model to be used in future research. In the study, three attributes of color were the focus in the color differentiation task. The study was conducted with 100 participants as with-in subjects design, in a full-scale office set-up under two different color temperature; warm white light (2700K and cold white light (4000K. The speed and accuracy of the color task were examined as an indication of task performance. The mood change of participants was assessed by Watson’s Positive and Negative Affect Schedule (PANAS mood measurement, self-satisfaction was assessed by Office Lighting Survey (OLS and perceived performance was assessed by questionnaire. The results showed that the total time spent for the color tasks performances have no significant. difference between 2700K and 4000K. It also showed that total accuracy of color task performances is statistically better under 4000K, compared to 2700K. Whereas color temperatures did not affect value differentiation task performance significantly, hue and chroma differentiation tasks performance were significantly better under 4000K color temperature. In terms of the effects of color temperature on mood, it is found that 4000K color temperature affected participants mood in a positive way. Also, self-satisfaction and perceived performances of participants are significantly better under 4000K color temperature.Item Open Access Effects of speech intelligibility on computer-based task performance in open-plan offices(Bilkent University, 2008) Kitapcı, KıvançThe aim of this thesis is to find out the effects of speech and speech intelligibility on computer-based task performance in open-plan offices. The research was conducted in a real open-plan office environment to include the open-office experience of subjects to the analysis. STM Bilkent Office was selected as the case, and 40 available open-office occupants were participated to the study. The experiment consists of three main phases. In the first phase, real-size measurement of selected open-office area within STM Bilkent was analyzed to understand effects of divider panels on acoustical situation of the room, and to check the reliability of the computer simulation. In the second phase, acoustical simulation of the site was done, to derive distribution graphs for speech related room acoustics parameters. In the last phase, occupants computer-based task performances were tested under three different sound environments, which are continuous noise, speech and masked speech. According to statistical analysis of performance test, and acoustical properties of the case STM, suggestions for renovation were discussed and tested in computer simulation. It was found that, effects of intelligible speech on occupants task performance is only psychological, because it is significant that there is no difference between results of performance test. However, all of the occupants respond to the questionnaires that speech sound environment was the most distracting one. Proposal for renovation was given to minimize the effects of intelligible speech on occupants for preventing the long-term effects on occupants’ health.Item Open Access Ivestigating the influence of spectral power distribution characteristics on hue differentiation task performance(Bilkent University, 2018-05) Taherzadeh, PardisThis thesis investigates the effects of spectral power distribution (SPD) characteristics of light sources on hue differentiation performance of observers. Color differentiation efficiency of light sources was investigated with respect to their SPD characteristics. Hue attribute of Kürkçü’s (2017) differentiation task was used in this study. Three different groups of students performed the hue differentiation task under 3 different lighting settings; D65, Light Emitting Diode (LED) and Compact Fluorescent Light (CFL) with 4000K and 6500K Correlated Color Temperatures (CCT). The speed and accuracy of performing the hue differentiation task were investigated to indicate the task performance. Ninety students from different departments at Bilkent University and Middle East Technical University voluntarily participated in this study. The participants performed the hue differentiation task inside a light booth as a control light condition. Additionally, the alertness level of the participants as a biological effect of light sources was also investigated in this study. The alertness level of participants was assessed using Karolinska Sleepiness Scale (KSS). The results showed that SPD characteristic of the light sources was effective on hue differentiation performance of observers. Indeed, the hue differentiation performance was in proportion to the radiation intensity of the SPDs of light sources. Overall accuracy and speed of D65 were significantly better in pairwise comparison with LED and CFL due to wide and continuous band SPD characteristic. Moreover, under LED light source the accuracy of Green to Blue (G to B) hue differentiation task was lower in comparison to other hue tasks. However, under CFL the accuracy of Red to Yellow (R to Y) hue differentiation task was lower in comparison to other hue tasks. It was found that alertness level and perceived performance of the participants were not significantly different under different light sources.