A systematic and simple discrete sliding mode controller design scheme based on the suboptimal approach is presented. The behaviors of the control system can be determined through a preferred performance index. The AC servomotor position control is obtained using only the q-axis voltage control loop. The proposed method is simulated and experimented with to verify the capability of this new sliding mode control algorithm. Properties such as easy implementation, fast response, and robustness with relation to external loads are demonstrated.

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A systematic and simple discrete sliding mode controller design scheme based on the suboptimal approach is presented. The behaviors of the control system can be determined through a preferred performance index. The AC servomotor position control is obtained using only the q-axis voltage control loop. The proposed method is simulated and experimented to verify the capability of this new sliding mode control algorithm. Properties such as easy implementation, fast resonse, and robust to external loads are demonstrated.

Nonlinear friction substantially affects the positioning accuracy of a machine, especially in torque controlled antibacklash twin worm index mechanism. A f u z q controller is designed to achieve better positioning accuracy and robustness by using system parameters obtained from identdication. Expenmental results show that repeatabilitp is improved as compared to the PDF controller.

Background A successful family meeting is key to family-centered care and may foster communication and improve the level of satisfaction of the family in terms of communication. In this study, we evaluated whether a proactive communication channel could improve the level of satisfaction of family members following a family meeting in a general medical ward setting. Methods We conducted a pre- and post-study to compare the level of satisfaction of a family with a family meeting before (N = 39) and after (N = 29) intervention in two general medical wards of a tertiary-care referral center. The intervention included a pre-emptive question and answer platform and a written response to family-raised queries in addition to a regular setting. Following each family meeting, family members were requested to fill a 10-item survey assessing their levels of satisfaction. Results The characteristics of the family members in terms of demographics, education levels, and previous experiences with family meetings in the pre- and post-intervention groups were similar. The scores in all the items that indicated the level of satisfaction significantly improved after intervention. The overall score for satisfaction increased from 85 (interquartile range, 80–95) to 98 (interquartile range, 93–100; P < 0.001). Conclusions Compared with conventional practice, the inclusion of a proactive communication platform along with a written response to raised queries as a part of family meetings improved the satisfaction levels of the family in terms of the content and process of the meeting in the general ward setting. Further studies are needed to delineate the optimal timing and use of such a communication modality.