This paper presents an assertional-style verification of the aircraft landing protocol of NASA’s SATS (Small Aircraft Transportation System) concept [1] using the I/O automata framework and the PVS theorem prover. We reconstructed the mathematical model of the landing protocol presented in [2] as an I/O automaton. In addition, we translated the I/O automaton into a corresponding PVS specificati...

This paper presents the formalization of some elements of mathematical analysis using the PVS veri cation system. Our main motivation was to extend the existing PVS libraries and provide means of modelling and reasoning about hybrid systems. The paper focuses on several important aspects of PVS including recent extensions of the type system and discusses their merits and e ectiveness. We conclu...

BACKGROUND Atrial fibrillation (AF) is frequently initiated from pulmonary veins (PVs), but little is known of the electrophysiological properties of PVs. METHODS AND RESULTS Two groups were studied: 28 patients (49+/-13 years old) with paroxysmal AF and 20 control patients (49+/-14 years old) without AF. Effective and functional refractory period and conduction time from PV to left atrium (L...

BACKGROUND Paravertebral blockade (PVB) is a regional anaesthetic technique with a large number of indications. PVB is usually performed with landmark-based techniques or methods that rely on pressure differences between the extra- and intraparavertebral space. This consecutive case series was designed to describe the ultrasound appearance of the lateral thoracic paravertebral space (PVS) and d...

BACKGROUND AND PURPOSE We investigated the relationship between magnetic resonance imaging-visible centrum semiovale perivascular spaces (CSO-PVS), a biomarker of impaired interstitial fluid drainage, and positron emission tomography-based amyloid-β burden across a wide range of cerebrovascular amyloid deposition. METHODS Thirty-one nondemented subjects (11 probable cerebral amyloid angiopath...

Previous studies suggest that people holding protected values show a bias against harmful acts as opposed to harmful omissions (omission bias). Protected values (PVs) have been seen as grounded in deontological moral rules to avoid causing harm. The present study 1) investigated the relationship between PVs and acts of commission versus omission in risky choices, using a paradigm where act and ...

High autonomy is an important goal of most mobile systems, it can be achieved in three ways: reducing energy consumption, increasing the capacity of batteries and replenishing battery energy over time. Another possibility comes from using an on-board generating system: in this context an embedded photovoltaic system (PVS) is a feasible solution. To model the whole system and to evaluate its ene...

OBJECTIVE To investigate the characteristics of ectopic automaticity and cation current (I(f)) of cardiac myocytes from pulmonary vein sleeves (PVs) in canines with atrial fibrillation. METHODS The canines (8-10 years old) were subjected to long-term, rapid atrial pacing (RAP) for 10 weeks, which induced the atrial fibrillation model. Disassociation of PVs of canines yielded single cardiac my...

BACKGROUND Conflicting perspectives about the diagnosis and prognosis of the persistent vegetative state (PVS) as well as end-of-life (EOL) decision-making were disseminated in the Terri Schiavo case. This study examined print media coverage of these features of the case. METHODS We retrieved print media coverage of the Schiavo case from the LexisNexis Academic database and used content analy...