Table of Content
, Volume 10 Issue 01
HUMAN FACTORS IN SIGNAL DESIGN OF CONTROL ROOM OF AN ELECTRIC POWER STATION
TSAO JIH-CHANG,LI CHIA-CHIH,CHING CHI-CHENG,CHANG TSENG-HUI,YU CHIH-SHENG,FENG KEN-CHUAN,CHU TSU-HSIANG
Simulation studies as well as field experiments were made to investigate the humanengineering aspects of control room, of the weak current type, of an electric power station.The topics under study were: (1) General layout of the control room in relation to perceptual-motor performanceof the human operators. (2) Comparison of work efficiency of operators in strong current and in weakcurrent control rooms. (3) Evaluation of the design of emergency signal system. (4) Comparison of two modes of signal presentation. (5) Coloration of the instrument panel and its bearing on the efficiency of vigi-lance tasks. This study was an appraisal of the man-machine system in the control room of anelectric power station; some general rules were also drawn thereof for improving controlroom designs.
A STUDY OF SCALE MARK DIMENSIONS,SEPARATION AND READING DISTANCE OF PANEL INSTRUMENT DIAL
HO PAO-YUAN,WANG TSI-CHIH,CHENG MEI-SHENG,CHIAO SHU-LAN
The effects of dial scale mark length, thickness, spacing and observing distance onreading speed and accuracy were studied under laboratory conditions. Preliminary ex-periments with simplified scales revealed that length and thickness are not as important asseparation of scale marks. These findings were verified by using simulated instrumentials as testing objects. Further experiments indicated that there exist lower limits forlength and thickness of scale mark, that the equal visual angle made by scale markdimensions and separation gives equal legibility, no matter what the observing distanceis, and that the legibility is a function of the visual angle made by the separation betweencale marks. Under our experiment conditions, this relation can be expressed by thequations, RT=1.41/α+91.2 and E=0.17/α~(1.71), where RT denotes reading reaction time,E, per cent reading errors, and α, visual angle of separation between scale marks inegree.
SIGNAL DETECTION UNDER UNDERLOADING CONDITIONS
Underloading is a situation in which the frequency of significant signals are very low.Signal detection was studied with intersignal intervals (ISI) varying from 1 to 90 minutesand with choice reactions (CR) varying from 2 to 8 signals. The main results were asfollows: 1. The phenomenon of "very long signal detection time" (over 20 sec. to 15 mi-nutes) under underloading conditions was observed. The probability of this phenomenonwas of a linear inclined function of ISI. As CR declined, the probability of the abovephenomenon also declined, but it could never be eliminated. 2. Under underloading conditions the logarithms of information transmissing werea linear declined function of ISI.
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