Abstract: A power system stabilization method includes: receiving a power command value from a power control center that monitors a power system; transmitting the power command value to a power supply device; causing the power supply device to supply power to the power system according to the power command value; generating a prediction command value according to past power command values received from the power control center, the prediction command value being a prediction value of a power command value to be transmitted from the power control center next after the power command value; transmitting the prediction command value to a power supply device; causing the power supply device to supply power to the power system according to the power prediction command value; receiving the next power command value from the power control center; transmitting the next power command value to the power supply device.

Abstract: A method including: setting a weighting function based on an amount of change in impedance of a control target; and determining, for a power controller, a transfer function composed of a transfer function of an internal model obtainable by performing Laplace transform on the voltage reference value and a transfer function of a partial controller, the transfer function of the partial controller being for outputting the control output after receiving, as an input, an output of the transfer function of the internal model, wherein the determining includes determining the transfer function of the partial controller using an H?control theory so as to reduce (i) a first amount of control obtainable by multiplying the control output and the weighting function and (ii) a second amount of control that is an output of the transfer function of the internal model.

Abstract: A power system stabilization method includes: receiving a power command value from a power control center that monitors a power system; transmitting the power command value to a power supply device; causing the power supply device to supply power to the power system according to the power command value; generating a prediction command value according to past power command values received from the power control center, the prediction command value being a prediction value of a power command value to be transmitted from the power control center next after the power command value; transmitting the prediction command value to a power supply device; causing the power supply device to supply power to the power system according to the power prediction command value; receiving the next power command value from the power control center; transmitting the next power command value to the power supply device.

Abstract: A method for designing a control apparatus includes: determining first, second and third threshold values; setting a first weighting function for calculating a first controlled variable by being multiplied by a difference between a control target value and an output value of a storage battery, a second weighting function for calculating a second controlled variable by being multiplied by the output value of the storage battery, and a third weighting function for calculating a third controlled variable by being multiplied by an integrated value of the output value of the storage battery; and determining a transfer function of the control apparatus in accordance with an H-infinity control theory such that the first controlled variable, the second controlled variable and the third controlled variable are respectively smaller than the first, second and third threshold values.

Abstract: A method including: setting a weighting function based on an amount of change in impedance of a control target; and determining, for a power controller, a transfer function composed of a transfer function of an internal model obtainable by performing Laplace transform on the voltage reference value and a transfer function of a partial controller, the transfer function of the partial controller being for outputting the control output after receiving, as an input, an output of the transfer function of the internal model, wherein the determining includes determining the transfer function of the partial controller using an H?control theory so as to reduce (i) a first amount of control obtainable by multiplying the control output and the weighting function and (ii) a second amount of control that is an output of the transfer function of the internal model.

Abstract: An FFT analysis is performed on the decoded image data of one frame, and a cutoff frequency based on the assumption that the original signal has first-order attenuation characteristics is obtained in both the horizontal and vertical directions. A sampled-data H? filter (digital filter), previously designed to have different parameters corresponding to different cutoff frequencies is selected. By using this filter, a filtering process is performed on the image data decoded both in the horizontal and vertical directions. Since the variety of the analog frequency characteristics of the original image is taken into account for every frame of the image, the information that seems to be noise in the original image is less likely to be removed, and mosquito noise and block noise associated with a coding/decoding process can be efficiently removed.

Abstract: A hearing aid tailored to a hard-of-hearing person is designed using sampled-data control theory. The method is for designing an audio signal processing system for a hearing aid, wherein the system comprises an AD converter for converting an analog audio input signal (yc) inputted to the hearing aid into a digital audio input signal, a hearing aid digital filter (K(z)) for performing a signal processing on the digital audio input signal outputted from the AD converter, and a DA converter for converting a digital signal outputted from the hearing aid digital filter into an analog audio output signal to be outputted to the hard-of-hearing person.

Abstract: A method for designing a control apparatus includes: determining first, second and third threshold values; setting a first weighting function for calculating a first controlled variable by being multiplied by a difference between a control target value and an output value of a storage battery, a second weighting function for calculating a second controlled variable by being multiplied by the output value of the storage battery, and a third weighting function for calculating a third controlled variable by being multiplied by an integrated value of the output value of the storage battery; and determining a transfer function of the control apparatus in accordance with an H-infinity control theory such that the first controlled variable, the second controlled variable and the third controlled variable are respectively smaller than the first, second and third threshold values.

Abstract: An FFT analysis is performed to the image data of one frame which has been decoded, and a cutoff frequency on the assumption that the original signal has first-order attenuation characteristics is obtained each in the horizontal direction and in the vertical direction. A sampled-data H? filter (digital filter) which has been previously designed in such a manner as to have different parameters corresponding to different cutoff frequencies is selected. By using this filter, a filtering process is performed to the image data which has been decoded both in the horizontal direction and in the vertical direction. Since the variety of the analog frequency characteristics of the original image is taken into account for every frame of image, the information that seems to be a noise yet actually exists in the original image is less likely to be removed, and a mosquito noise and block noise associated with a coding/decoding process can be efficiently removed.

Abstract: In the present invention, a steel product having a specified composition comprising by weight C: 0.02 to 0.25%, Si: 0.01 to 2.0%, Mn: 0.30 to 1.5%, Al: 0.003 to 0.10%, Nb: 0.005 to 0.10%, and Mo: 0.05 to 1.00% with the balance consisting of Fe and unavoidable impurities is used to prepare a steel plate having a thickness of 3 to 100 mm (the upper limits of the Nb and Mo contents each being 0.025% particularly for a plate thickness of 3 to 25 mm), and the ratio of the yield stress of the steel plate at a temperature T, .sigma..sub.yT, to the yield stress of the steel plate at room temperature, .sigma..sub.y, over the temperature range of room temperature to 600.degree. C. is brought to a value falling within the following range:1.00-1.083.times.10.sup.-3 T<(.sigma..sub.yT /.sigma..sub.y)<1.16-5.101.times.10.sup.-4 T.Further, the constituents of a welding material are specified to bring the .gamma..sub.3 transformation temperature to below 620.degree. C.