Susan Cady, Christine Roysdon and Sharon L. Siegler
The advent of computerized literature searching of on‐line databases has convinced librarians that a significant increase in both the quantity and quality of reference service can…
Abstract
The advent of computerized literature searching of on‐line databases has convinced librarians that a significant increase in both the quantity and quality of reference service can be delivered to library users. As part of a technically‐oriented academic environment, the Lehigh University Libraries in Bethlehem, Pennsylvania were particularly anxious to demonstrate to faculty, students, and the community the benefits available through online database technology. Therefore, searching of online databases began at the University Libraries in early 1978 and by 1981 the services used included Lockheed/DIALOG, SDC/ORBIT, and BRS.
Qiang Cao, Jianfeng Li and Mingjie Dong
The purpose of this paper is to evaluate three categories of four-degrees of freedom (4-DOFs) upper limb rehabilitation exoskeleton mechanisms from the perspective of relative…
Abstract
Purpose
The purpose of this paper is to evaluate three categories of four-degrees of freedom (4-DOFs) upper limb rehabilitation exoskeleton mechanisms from the perspective of relative movement offsets between the upper limb and the exoskeleton, so as to provide reference for the selection of exoskeleton mechanism configurations.
Design/methodology/approach
According to the configuration synthesis and optimum principles of 4-DOFs upper limb exoskeleton mechanisms, three categories of exoskeletons compatible with upper limb were proposed. From the perspective of human exoskeleton closed chain, through reasonable decomposition and kinematic characteristics analysis of passive connective joints, the kinematic equations of three categories exoskeletons were established and inverse position solution method were addressed. Subsequently, three indexes, which can represent the relative movement offsets of human–exoskeleton were defined.
Findings
Based on the presented position solution and evaluation indexes, the joint displacements and relative movement offsets of the three exoskeletons during eating movement were compared, on which the kinematic characteristics were investigated. The results indicated that the second category of exoskeleton was more suitable for upper limb rehabilitation than the other two categories.
Originality/value
This paper has a certain reference value for the selection of the 4-DOFs upper extremity rehabilitation exoskeleton mechanism configurations. The selected exoskeleton can ensure the safety and comfort of stroke patients with upper limb dyskinesia during rehabilitation training.