Abstract. Door width is one of the important factors to concern in layout or facilities design because it affects directly to traffic speed and overall traffic time simultaneously. Nowadays, common assessment method is computer simulation which is still not realistic due to the unchanged speed of model while walking through a door. This research aims to study an effect of door width to individual walking speed. Sixty subjects participated in the experiment and performed task by walking through the door that is set the width as 40, 50, 60, 70, 80, 90 and 100 centimetres. The optical motion capture system was used to determine walking speed. The results showed that Fitts' law was applied to the participants with high weight. Door width below 70 centimetres significantly affected to changing speed at 0-0.5 m. before the door. Additionally, human size also affected changing speed. The factors include shoulder breadth, weight and interaction between shoulder breadth and weight were found to be significant. These factors explained 54.2% of changing speed.

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The 3-D monitor has been decreased in its price till more people can buy and watch it at home. However, the complexity of 3-D monitor technology may cause people to not know the problem affecting their health. The 3-D monitor technology uses the watching capability of human. Both eyes can detect the object distance by controlling the eye muscle groups. Nevertheless, the 3-D monitor technology creates 3-D pictures irrelatively to normal brain process. This confusion affects the brain as headache, dizziness, and unbalancing. Moreover, it may have high effect on children who are in the developing age of brain, movement and eyesight. Furthermore, if people cannot recover themselves after watching 3-D monitors, it may affect indirectly on common activities which require the object distance perception such as walking across the road, stepping on the stair or driving a vehicle. Therefore, in order to protect these accidental events, this article stated the problem and the recommendation for watching 3-D monitors.

Abstract-There are many pointing device for computer usage especially device so call "Mouse". Mouse is a wildly use standard device which can effect user if using for a long time such as carpal tunnel syndrome (CTS). Ergonomics mouse or mouse that angle has been designed to suit with human low risk to have CTS. But ergonomics mouse is not widespread because of price and skill of each person, Steering law has been used to evaluate the performance of regular mouse with ergonomics mouse. The Index of difficulty (ID) is set between 16-42 total of 6 condition, The result show ergonomics mouse angle 90 degree performance is better than regular mouse at height ID.

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