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Product ergonomics
Published in Prabir Mukhopadhyay, Ergonomics Principles in Design, 2023
The take-off percentile value would be lower and then gradually optimized towards the higher percentile. Keep allowance for slippers (an allowance of 2–3 cm). Thus, to the optimized value you may add 2–3 cm. Ensure that the top of the refrigerator should be accessible for the person with a shorter percentile and at the same time the person with taller stature should not have to stoop to reach for it.The door handle should be at the elbow height of the user. We follow the same procedure for door handle height as discussed for doors in the previous sections
Affordance Theory
Published in Debra Flanders Cushing, Evonne Miller, Creating Great Places, 2019
Debra Flanders Cushing, Evonne Miller
Cues to actions in urban places are often determined by the surfaces, objects, and layout of a space. Some cues are ‘natural signals, naturally interpreted, without any need to be conscious of them’ (Norman, 1988). This natural interpretation can be the result of the shape of an object. For example, a round door handle or knob is designed to turn. When you see one, you expect to be able to turn the handle and pull the door open. It is because of the way your hand fits nicely around the door handle and your arm is in a better position to pull, rather than push, that your hand-to-handle fit makes sense. This cue is natural and there is no need for signage to indicate otherwise. Similarly, when a door has only a flat metal plate attached to it the natural action is to push the door open. There is nothing to actually hold onto in order to pull. Again, this is a natural cue that doesn’t require signage. Yet, when designers work outside of these natural cues and natural actions, things can get difficult, or sometimes embarrassing if you first push a door that has a sign on it saying pull. And let’s be honest, we have all done it.
Assessing workload in using electromyography (EMG)-based prostheses
Published in Ergonomics, 2023
Junho Park, Joseph Berman, Albert Dodson, Yunmei Liu, Matthew Armstrong, He Huang, David Kaber, Jaime Ruiz, Maryam Zahabi
Participants were provided instructions on how to complete the two tasks. The order of tasks was randomised to avoid any learning effect from one task to another. For CRT trials, the instruction included moving as many clothespins as possible from the horizontal rod to the vertical rod and back within 2 min. The number of successfully relocated clothespins was recorded at the end of each trial. For SHAP—Door Handle task, participants were instructed to rotate the handle five times as fast as possible. The participant’s eyes were tracked throughout each trial. All participants completed a total of three trials for each task and were provided with a 5-min rest period after each trial. After each actual trial, participants filled out the NASA-TLX questionnaire. Figure 4 illustrates a summary of the experimental procedure.