ABSTRACT
Working sites in manufacturing industry are still experiencing many accidents. As measures against human errors, workers are encouraged to confirm by pointing and calling [1], take a regular rest, and so on. However, the decline of concentration prevents the confirmation itself. The duration of lasting concentration varies with each worker. It is difficult to address the problem with the measures taken in a fixed period. Even if a method is devised to increase concentration or to keep longer concentration, the decline in concentration should be detected for each worker. Detection of concentration decline for each worker would solve problems attributed to individual difference, which greatly reduce human errors. A method to detect a decline in concentration is indispensable to establish safe production lines with high productivity.
