In many research laboratories, Iterative Learning Control (ILC) has proven itself to be a very effective technique to reduce repetitive control errors that occur in systems that continually perform the same motion or operation. Based on errors from previous operations, the technique iteratively constructs a feedforward signal, with which extremely small tracking errors are obtained [4, 51-Howev...

introduction: work-related musculoskeleta ldisorders (wmsds) of upperlimbs (ul)in the last 35 years have become extremely widespread, reaching epidemiclevels, inalladv ancedindustrializedcountries. they are considered the main cause of disability, time off work, and requests for healthcare . method and materials: for detailed risk assessment, iso -11228-3 is the preferred method. it is recommen...

Driven by increasing societal, economic, and technological pressures , high-precision motion systems must achieve ever increasing speed and accuracy requirements. Motion systems are used in many different application areas, including hard disk drives (HDDs) in consumer electronics, wafer steppers and scanners in nano-scale manufacturing machines, electron and atomic force microscopes for nano-s...

The throwing athlete is at increased risk for injury to the shoulder because of the large and repetitive forces generated during the throwing motion. Injuries may occur from a single supraphysiologic load or from repeated subthreshold loads that cumulatively damage the tissue. The act of throwing has been classified, with some variation, into five stages: windup, early cocking, late cocking, ac...

PURPOSE The repetitive micro traumatic stresses placed on the athletes shoulder joint complex during the throwing motion challenge the surrounding tissues. The purpose of this study was to compare shoulder rotational strength, range of motion and proprioception between the throwing athletes and non-athletic persons. METHODS Fifteen throwing athletes and 15 non-athletes participated in a nonra...

In general, people who perform repetitive motions are often vulnerable to repetitive strain injuries. Because musicians must execute the same motion over and over again while practicing and performing their music, they are an example of a group that often develops these repetitive strain injuries. More specifically, musicians are known for developing neuropathies in their upper limbs, with carp...

This paper proposes a discrete-time repetitive optimal control of electrically driven robotic manipulators using an uncertainty estimator. The proposed control method can be used for performing repetitive motion, which covers many industrial applications of robotic manipulators. This kind of control law is in the class of torque-based control in which the joint torques are generated by permanen...

Background: Most elastography studies focus on detecting property anomalies of internal organs such as heart and kidney [1]. We report a preliminary work on computing strain elastograms of human skin. A camcorder was used to capture the deformation of skin surface in a video sequence, upon which tracking was performed with an optical flow method to generate a dense motion field [2]. A strain el...