We will discuss a parametric study of the solution of the Wigner-Poisson equations for resonant tunneling diodes. These structures exhibit self-sustaining oscillations in certain operating regimes. We show numerically that the phenomenon corresponds to a Hopf bifurcation, using the bias across the device as a continuation parameter. We will describe the engineering consequences of our study and...

Mobile computers often bene t from software which adapts to its location For example a computer might be backed up when at the o ce or the default printer might always be a nearby one In many existing systems location triggered actions are only possible for speci c applications or with special infrastructure This paper describes lcron a system which supports user con gurable actions triggered o...

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This paper defines a new class of unidirectional errors,named t/u-unidirectional errors, which affect at most 1 bits confined to atmost u bytes of the code word. Codes that are capable of detecting, Iocat-ing and correcting N-unidirectional errors are presented. Lower boundson the number of checkbits required for N-unidirectional error detec-tion and location are also presen...