A method for MEMS macromodel development is presented which is based on a physical device description to obtain mathematical relations for the device operation. Since design and technology parameters are input parameters of the resulting model, this method is well suited for design studies. As a benchmark problem, we refer to the macromodel of a micropump driven by an electrostatically actuated...

Forward and Reverse Characteristics M. Lades y, A. Schenk ], U. Krumbein ], G. Wachutka y, W. Fichtner ] yPhysics of Electrotechnology, Tech. Univ. of Munich, Germany ]Integrated Systems Laboratory, ETH{Z urich, Switzerland A numerical analysis of the static forward and reverse characteristics of 6H-SiC PIN-diodes has been performed across a temperature range of 300 623 K. Using the device sim...

We explored how the perception of stiffness can be distorted in Minimally Invasive Surgery. We combined a mechanical simulator with a haptic device, and implemented linear springs at the tip of the simulated laparoscopic device. To explore the influence of mechanical advantage on perception, we set different values of the ratio between internal and external length of the tool. We found that a n...

BACKGROUND Iloprost (Ventavis) inhalation solution is approved in doses of 2.5 microg and 5.0 microg for treatment of pulmonary arterial hypertension (World Health Organization group I) in patients with New York Heart Association class III or IV symptoms, delivered with 2 Adaptive Aerosol Delivery (AAD) systems: Prodose and I-neb. The HaloLite device was the first-generation AAD system used in ...

As MOSFET dimensions continue to shrink, the promise of further optimizing device performance and the problem of the Reverse Short Channel Effect point to the need for an understanding of the effect of laterally non-uniform profiles on device output characteristics. A semi-analytical model is developed to calculate the current of a device with a laterally nonuniform channel profile, from which ...

Carrier trapping via tunneling into the gate oxide was implemented into a partial differential equation -based semiconductor device simulator to analyze the -like noise in silicon MOSFETs. Local noise sources are calculated using the carrier tunneling rates between trap centers in the oxide and those at the interface. Using the Green’s transfer function approach, noise contributions from each n...

OBJECTIVE To design and fabricate a device to simulate evoked thumb adduction in response to ulnar nerve stimulation. METHODS We implemented a computer-controlled, motorized thumb (TWITCHER) that responds to ulnar nerve stimulation by an unmodified peripheral nerve stimulator. Clinically realistic response patterns are generated for both depolarizing and non-depolarizing muscle relaxants and ...

Ventriculostomy is a neurosurgical procedure that consists of the insertion of a catheter into the ventricles of the brain for relieving the intracranial pressure. A distinct "popping" sensation is felt as the catheter enters the ventricles. Early ventriculostomy simulators provided some basic audio/visual feedback to simulate the procedure, displaying a 3D virtual model of a human head. Withou...

Accurate and reliable simulation of a circuit behaviour cannot be obtained without adequate device models. FIT–2 is an interactive program for extraction of transistor parameters for SPICE–like circuit simulators. It is based on a circuit simulator rather than an explicit set of model equations. Several optimization methods are built into the program to provide robust as well as efficient fitti...

Normally-off operation of high electron mobility transistors is desired for many reasons, however proved to be difficult to achieve, despite the rapid development of the depletion mode devices. Amongst the few approaches proposed so far, we focus on two, which promise high performance. The first device features an InGaN cap layer, while the later relies on gate recess technology. We perform DC ...