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To predict reliability, an analytical model for drain current degradation in amorphous-silicon (a-Si) thin-film transistors (TFTs) is developed for the low-gate-field region, where defect creation dominates the threshold voltage shift. Starting with fundamental models where the local threshold shift depends on the local channel electron density, a stretched exponential expression for current degradation...
This paper develops a new multiple-model based adaptive control scheme to compensate actuation sign uncertainty, which employs three steps: (1) design multiple estimators; (2) design multiple controllers using an error transformation relating to the output tracking error, the estimation error, and a virtual tracking error between the estimator state and the reference signal; and (3) design a control...
This paper presented a method of estimating voltage stability for an AC/DC system based on nonlinear programming analysis of voltage stability for an AC system, and built the AC /DC model. This method converts the calculation of point of collapse (PoC) of AC/DC systems to a problem of optimizing load, which is solved by Sequential Quadratic Programming method (SQP). The method can handle various inequality...
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