**3.1.2 Sensing and motion augmentation**

This category represents robotic devices which are equipped with a part of human body and support its movements. These systems should be designed accurately not to interfering complex movements on joints. An exoskeleton developed by University of Tsukuba works only when the wearer needs its help so that it doesn't disturb wearer's delicate works [12]. Researchers in Okayama University developed some wearable robots called "Power Assist Wear" [13]. Their actuator is a pneumatic rubber artificial muscle which is light, soft and fitted for users. "Power Assist Glove" is made from a curved type of artificial muscle which is a combination of materials with different stretch, e.g. rubbers and cloths. Although they are mainly used as rehabilitation tools at the moment because of their limited effectiveness, some products aim at being adapted to construction works and enabling elderly or female workers to work with less physical efforts.


