This paper describes the aplication of different model which can be used for short-term load prediction. The model is based on Bohlin's approach to first develop a load profile model representing the nominal load component and the Box-Jenkins approach is used to predict residuals. An on-line algorithm using Kalman Filter and Time Series is implemented for and hour-ahead prediction. In the Kalman Filter system equation and measurement equation were fixed and parameters of Time Series were varied week after week. A set of data for Korea Electric Power Corporation from April to June 1981 was used for the evaluation of the model. As the result of this simulation 1.2% rms error was acquired.

In this paper, we investigated that the Al-Amorphous Se-Al structure had a large photovoltage and a Dark EMF (DEMF). This DEMF phenomena did not show just after the fabrication of a sample. However, it was shown after a few days, and it was increased with time, and was saturated after 30 days. Just after the fabrication of a sample, by appling the positive voltage on a sample for 100mins, we observed almost the same effect as had shown in a aging experiment. As the results, we found that Al3+ ions has related to a DEMF by migrating into amorphous Se, and form a trap in amorphous Se. We have also observed the photocapacitance effect to identify this trap formation.

This paper presents a steady-state computer solution of the fundamental semiconductor one-dimensional transport equations, describing a single (metal-semiconductor) contact device, involving only one type of charge carrier. The computations are conveniently made by the

In this paper, an attempt is made to match the continuous state trajectory of the digital control system with that of its continuous data model. Matching the state trajectories instead of the output responses assures that the performances of the internal variables of the plant as well as the output variables are preserved in the discretization. The mathematical tool used in this research is an extended maximum principle of the Pontryagin type, which enables one to synthesize a staircase type of optimal control signals, such as the output signal of a zero-order hold asociated with a digital controller. A general mathematical expression of the digital controller which may be used to replace the analog controller of a general system while preserving as mauch as possible the performance characteristics of the original continuous-data control system is derived in this paper.

The problem of model reference adaptive control for the discrete time system is considered and the global stability of the overall system is shown. It extends the results of Kreisselmeier's to more general reference models and the method presented here makes the output error and controller parameter error converge to zero. The scheme presented in this paper is simulated and the simulation gives the expected results.