Abstract: N neural networks having different set-values are provided, where N is an integer greater than 2. Each neural network has plurality of artificial neurons and processes information. An optimal output detecting circuit receives outputs of the N neural networks and determines the optimal one of the neural networks based on the outputs of the N neural networks. An output circuit receives and outputs the output of the neural network detected by the optimal output detecting circuit.

Abstract: A signal processing apparatus using a neural network according to this invention includes a reference signal generating section for generating a plurality of reference signals having different signal values, a complement signal generating section for receiving the reference signals and an unknown input signal as an object to be processed, and generating a plurality of complement signals, indicating complement values of the corresponding reference signals with respect to a signal value obtained by multiplying the unknown input signal with a natural number, a multiplication section for receiving the reference signals and the complement signals, and multiplying the reference signals with the corresponding complement signals, and a neural network, in which a plurality of neurons are reciprocal-inhibition-coupled, the neurons receive the products obtained by the multiplication section, and the neuron, which receives the product having a largest value, outputs a spark signal.

Abstract: An apparatus for controlling operation of a recovery boiler for compensating a predetermined reference temperature of black liquor by a compensation value in accordance with a type of an injecting gun provided in the boiler, a compensation value set by the properties of the black liquor, a compensation value set by the temperature of charbed and a compensation value set by an air flow rate to the boiler representing the magnitude of boiler steam output or load to control the black liquor temperature supplied to the boiler.

Abstract: There is provided a process control system having a deviation circuit for calculating a deviation of the process variable representing a state of a process to be controlled from the set-point value. And there is provided a process control system further including a differential circuit for differentiating a deviation, a controller for estimating a trend of a process on the basis of the two pieces of information and determining a proper controlling amount of the process variable in accordance with the process trend estimated.