The powertrain control problem is one of regulating the air-to-fuel ratio in an automotive engine. A series of models of such controllers, with increasing levels of sophistication and fidelity to real-world designs, have been recently proposed by Toyota researchers as challenge problems for today’s verification technologies.

We present a bifurcation analysis of electrical alternans in the two-current Mitchell-Schaeffer (MS) cardiac-cell model using the theory of -decidability over the reals. Electrical alternans is a phenomenon characterized by a variation in the successive Action Potential Durations (APDs) generated by a single cardiac cell or tissue.

Optimization algorithms used in a real-time and safety-critical context offer the potential for considerably advancing robotic and autonomous systems by improving their ability to execute complex missions. However, this promise cannot happen without proper attention to the considerably stronger operational constraints that real time, safety-critical applications must meet, unlike their non-real-time, desktop counterparts.

This exhibition presents two projects. The first project is a framework and associated tooling for the extraction of system specifications from test data that has been automatically generated from automated executions of the system. The test data in our framework consists of sequences of inputs to and the corresponding outputs from the system. From an initial collection of test data, data-mining techniques are used to infer the invariants; then the system is instrumented with the invariants and new test data is generated to try to invalidate the mined invariants.

Part 1: Upper-limb motor impairments arise from a wide range of clinical conditions including amputations, spinal cord injury, or stroke. Addressing lost hand function, therefore, is a major focus of rehabilitation interventions; and research in robotic hands and hand exoskeletons aimed at restoring fine motor control functions gained significant speed recently. Integration of these robots with neural control mechanisms is also an ongoing research direction.

Oceans are drivers of global climate; they are home to some of our most important and diverse ecosystems; and they provide a substantial amount to the world’s economy as a major source of food and employment. Sound plays a vital role in the ocean ecosystem, as many organisms rely on the acoustic environment for navigation, communication, detecting predators and finding food. Therefore, the 3D underwater soundscape, i.e., the combination of sounds present in the immersive underwater environment, is of extreme importance to ultimately understanding and protecting underwater ecosystems.

 We transitioned from a tethered system to a fully wearable mobile one, which is suitable for clinical applications. We designed the textile components of the exosuit to provide unilateral assistance to the paretic limb of persons poststroke during walking. The suit provides partial assistance to ankle dorsiflexion (DF) and ankle plantarflexion (PF) and encourages a more symmetric and natural gait. The results of our treadmill-based study show that the exosuit could improve interlimb propulsion symmetry and ankle kinematics of seven chronic poststroke patients.