Péter Koltai

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Acoustic features of expiratory cry vocalizations were studied in 125 pre-term infants prior to being discharged from a level-3 neonatal intensive care unit. The purpose was to describe various phonatory behaviors in infants in whom significant hearing loss could be ruled out. We also compared these results with normal-hearing full-term infants, and(More)
OBJECTIVE To evaluate the polysomnographic outcomes after supraglottoplasty (SGP) performed for obstructive sleep apnea syndrome (OSAS) associated with occult laryngomalacia. DESIGN Retrospective case series with medical chart review. SETTING Tertiary pediatric medical center. PATIENTS Twenty-two patients aged 2 to 17 years met the inclusion criteria(More)
The long-term distributions of trajectories of a flow are described by invariant densities, i.e. fixed points of an associated transfer operator. In addition, global slowly mixing structures , such as almost-invariant sets, which partition phase space into regions that are almost dynamically disconnected, can also be identified by certain eigenfunctions of(More)
OBJECTIVE To review our experience with intracapsular tonsillectomy using powered instrumentation in the management of tonsillar hypertrophy causing obstructive sleep-disordered breathing in children. STUDY DESIGN Retrospective case series. METHODS Intracapsular tonsillectomy, a form of partial tonsillectomy performed with an endoscopic microdebrider,(More)
Pediatric obstructive sleep apnea (OSA) is not always resolved or improved with adenotonsillectomy. Persistent or complex cases of pediatric OSA may be due to sites of obstruction in the airway other than the tonsils and adenoids. Identifying these areas in the past has been problematic, and therefore, therapy for OSA in children who have failed(More)
We propose a new approach to the transfer operator based analysis of the conformation dynamics of molecules. It is based on a statistical independence ansatz for the eigenfunctions of the operator related to a partitioning into subsystems. Numerical tests performed on small systems show excellent qualitative agreement between mean field and exact model, at(More)
The global macroscopic behaviour of a dynamical system is encoded in the eigen-functions of a certain transfer operator associated to it. For systems with low dimensional long term dynamics, efficient techniques exist for a numerical approximation of the most important eigenfunctions, cf. [7]. They are based on a projection of the operator onto a space of(More)