Upper limb rehabilitation robot system (IMAGE) Beijing Institute of Technology Press Co., Ltd Caption Impedance Sliding-Mode Control Based on Stiffness Scheduling for Rehabilitation Robot Systems Credit Cyborg and Bionic Systems Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.