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This paper proposes a danger index to estimate user's safety during mobility assistance. The formulation and validation of the index is achieved through extensive subjective and objective experimentation. A motion control method is also introduced that uses the proposed danger index for monitoring user's safety and initiating proper safety actions in case of danger. As an example, experimental results with SpiderBot-II are reported in this paper.<\/jats:p>","DOI":"10.1017\/s0263574710000706","type":"journal-article","created":{"date-parts":[[2010,12,2]],"date-time":"2010-12-02T12:59:45Z","timestamp":1291294785000},"page":"767-785","source":"Crossref","is-referenced-by-count":8,"title":["Safe physical<\/i> human\u2013robot interaction of mobility assistance robots: evaluation index and control"],"prefix":"10.1017","volume":"29","author":[{"given":"Aslam","family":"Pervez","sequence":"first","affiliation":[]},{"given":"Jeha","family":"Ryu","sequence":"additional","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2010,12,2]]},"reference":[{"key":"S0263574710000706_ref44","doi-asserted-by":"publisher","DOI":"10.1038\/sj.ijo.0801856"},{"key":"S0263574710000706_ref23","doi-asserted-by":"publisher","DOI":"10.1109\/3516.653047"},{"key":"S0263574710000706_ref26","doi-asserted-by":"publisher","DOI":"10.1016\/S0921-8890(03)00042-3"},{"key":"S0263574710000706_ref24","doi-asserted-by":"publisher","DOI":"10.1177\/0278364904042193"},{"key":"S0263574710000706_ref16","doi-asserted-by":"publisher","DOI":"10.1016\/j.robot.2005.10.005"},{"key":"S0263574710000706_ref19","first-page":"3624","volume-title":"Proceedings of IEEE International Conference on Robotics and Automation","author":"Park","year":"2005"},{"key":"S0263574710000706_ref12","first-page":"1623","volume-title":"Proceedings of Intelligent Robots and Systems","author":"De Luca","year":"2006"},{"key":"S0263574710000706_ref50","first-page":"2714","volume-title":"Proceedings of International Conference on Control, Automation and Systems","author":"Pervez","year":"2007"},{"key":"S0263574710000706_ref45","volume-title":"CIMSA 2006 \u2013 IEEE International Conference on Computational Intelligence for Measurement Systems and Applications","author":"Malki","year":"2006"},{"key":"S0263574710000706_ref18","first-page":"2724","volume-title":"Proceedings of IEEE\/RSJ International Conference on Intelligent Robots and System","author":"Liu","year":"2005"},{"key":"S0263574710000706_ref1","unstructured":"1. 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