A Reliability Prediction Methodology for LED Arrays

In this paper, a physics of failure-based prediction method is combined with statistical models to consider the impact of current crowding and current droop effects on the reliability of LED arrays. Electronic-thermal models of LEDs are utilized to obtain the operation conditions under the influences of current crowding and current droop. A...

A stochastic process based reliability prediction method for LED driver

In this study, we present a general methodology that combines the reliability theory with physics of failure for reliability prediction of an LED driver. More specifically, an integrated LED lamp, which includes an LED light source with statistical distribution of luminous flux, and a driver with a few critical components, is considered. The...

Availability of the Switching Node in the Delft Rural Telephone System

In het kader van het rurale telefonie project is onderzoek gedaan naar de beschikbaarheid van de knooppunten in het "Delft Rural Telephone System" (DRTS). Het begrip rurale telefonie wordt besproken en het belang ervan in ontwikkelingslanden. Daarna komt het ontwerp van een DRTS knooppunt aan de orde en wordt ingegaan op de eisen die aan de...