This paper reports the design and evaluation of a novel piezo based actuator for needle drive in autonomous Deep Anterior Lamellar Keratoplasty (piezo-DALK). The actuator weighs less than 8g and is 20mm × 20mm × 10.5mm in size, making it ideal for eye-mounted applications. Mean open loop positional deviation was 1.17 ± 3.15um, and system repeatability and accuracy were 17.16um and 18.33um, respectively. Stall force was found to vary linearly with the cooling cycle and the actuator achieved a maximum drive force of…

This paper provides a cooperative control strategy for a team of pursuers to capture a fast evader. Closed-form expressions are provided for a bound on the sufficient number of pursuer agents for geometric feasibility for defense manifold maintenance in a time-bounded planar multi-player reach-avoid game. In particular, the analytic bound provides a practical lower bound on the pursuer team size to partition the bounded game domain, thus preventing the evader from reaching its target without getting within a finit…

Since the first reports of a novel coronavirus (SARS-CoV-2) in December 2019, over 33 million people have been infected worldwide and approximately 1 million people worldwide have died from the disease caused by this virus, COVID-19. In the United States alone, there have been approximately 7 million cases and over 200,000 deaths. This outbreak has placed an enormous strain on healthcare systems and workers. Severe cases require hospital care, and 8.5% of patients require mechanical ventilation in an intensive car…

Efficient urban transportation has time and time again proved to be a difficult problem to rectify. One modern solution is the bike-sharing system, where many bicycles are available either at hubs or spread across a city for short-term use. However, usage is limited to those located close enough to a bicycle hub that traveling to and from it is time-effective. As for hubless bike-shares, bicycles require redistribution over time to remain conveniently available to many. We propose the creation of an electric bicyc…