This systematic review aims to gather primary data from cancer institutions that have implemented changes to cancer service provision amid the COVID-19 outbreak to inform future intervention and health care facility response strategies. A comprehensive literature search was done on Global Health Medline and EMBASE using pertinent key words and MeSH terms relating to COVID-19 and Cancer service provision. A total of 72 articles were selected for inclusion in this systematic review. Following the narrative synthesis that was conducted of the literature, 6 core themes that encompassed common cancer service intervention adopted by institutions were identified: (1) Testing and Tracking, (2) Outreach and Communication, (3) Protection, (4) Social Distancing (5) Treatment Management, (6) Service Restructuring. Since cancer patients are a high-risk population amid the COVID-19 pandemic, these areas of targeted intervention can be used to inform necessary actions in institutions facing similar risks, based on previous learning from numerous cancer centers globally.
Piezoelectric friction actuating mechanism is chosen to construct long traveling range sub-micro X-Y positioning table. LuGre friction model is employed to simulate the friction dynamics of this positioning mechanism. The optimization scheme of Matlab toolbox is adopted to search the optimal friction model parameters. However, this piezoelectric actuating system has obvious nonlinear and time-varying dead-zone offset control voltage due to the static friction and preload. The estimated LuGre dynamic model is still not accurate enough for model-based precision control design. Hence, the adaptive sliding mode control (SMC) with robust behavior is employed to design the nonlinear controller for this piezoelectric friction actuating mechanism. The Laypunov-like design strategy is adopted to achieve the system stability criterion. The dynamic experimental results of the proposed nonlinear controllers are compared with that of a model-based PID controller, too.
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