The In the modern society, human beings interact with computer networks and mechanical systems. This interaction is, unfortunately, asymmetrical at this point of time. Human beings easily understand the computer's way of thinking, because computers and mechanical systems are human-made. On the other hand, computers do not understand human way of thinking, because computers do not have psychological model of human beings. This situation must be improved so that the interaction between humans and computers could be symmetrical. The physical interaction between humans and computers is done through mechatronics. Mechatronics is known as the discipline integrated by mechanical, electrical and information technology and has been used to produce advanced artifacts used in modern society, which has been developed through the interdisciplinary studies of diverse engineering fields. Our modern life is surrounded and enhanced by gadgets and gimmicks of mechatronics products, and those who use the products can get used to improve their operation skill. It is expected to develop mechatronics systems which are capable of adapting themselves to the level of the skill or dexterity of humans who use the systems. We need to found a new mechatronics discipline considering human in the closed loop. This may be named "Human adaptive mechatronics" and is a new discipline of the integration of mechanical, electrical, information technology and human sciences. Its application fields are found in diverse fields from smart human-machine interface from smart human-machine interface for tele-surgery operation to rehabilitation assisting machines.
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