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We describe a new physics based, analytical DC model accounting for short channel effects for hydrogenated amorphous silicon (a-Si:H) thin film transistors (TFT's). This model is based on the long channel device model. Two important short-channel phenomena, self-heating and kink effects, are analyzed in detail. For the self-heating effect, a thermal kinetic analysis is carried out and a physical model and an equivalent circuit are used to estimate the thermal resistance of the device. In deriving the analytical model for self-heating effect, a first order approximation and self-consistency are used to give an iteration-free model accurate for a temperature rise of up to 100/spl deg/C. In the modeling of the kink effects, a semi-empirical approach is used based on the physics involved. The combined model accurately reproduces the DC characteristics of a-Si:H TFT's with a gate length of the 4 /spl mu/m. Predictions for a-Si:H TFT's scaled down to 1 /spl mu/m are also provided. The model is suitable for use in device and circuit simulators.
In dieser Arbeit werden M/G/1-Warteschlangen mit unendlich großem Warteraum und einem Server, der Bedienpausen und Bereitstellungszeiten benötigt, für die absperrende, begrenzende, binomiale, entleerende, vermindernde und bernoullische Bediendisziplin untersucht. Dabei bestimmt die Bediendisziplin, wie viele Kunden der Server in einem Zyklus, das ist die Zeit zwischen zwei Pausenenden, bedient.
Wichtige Kenngrößen eines solchen Modells sind die Wartezeit eines Kunden, die Warteschlangenlänge zu einem beliebigen Zeitpunkt und die Zyklusdauer. Für jede der sechs Bediendisziplinen werden die Verteilung und die ersten beiden Momente dieser Kenngrößen berechnet.
Die Ergebnisse werden benutzt, um die Abhängigkeit der ersten Momente der Kenngrößen von der Ankunftsrate, der Kundenbediendauer, der Pausenlänge und der Dauer der Bereitstellungszeit zu untersuchen. Ferner werden die sechs Bediendisziplinen bezüglich der Erwartungswerte der Kenngrößen miteinander verglichen.
Your one-stop solution for getting up and running with SQL Server 2000
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