Fujitsu Corporation

Kabushiki Kaisha Toshiba

Isuzu Motors Limited

Toshiba Storage Device Corporation

Transtron Inc.

Transform Inc

Yoshiaki Ikai

Takahiro Imamura

Yoshitaka Suzuki

Tomoyuki Tsunoda

Takahiro Saito

Satoshi Hanawa

Junji Kaneko

Shigenori Yanagi

Ken Kobayashi

Atsuo Iida

Yoshimasa Kadooka

Toru Yokohata

Yuhei Umeda

Tohru Fujimaki

Tomonori Yamashita

Hidekazu Fujie

Takuma Degawa

Kazuaki Hiraoka

A non-transitory computer-readable recording medium stores an information processing program for causing a computer to execute processing including: acquiring data that indicates a relationship between element actions for a plurality of element actions in an object period; acquiring an effective time that corresponds to an object action; and searching for a combination of two or more element actions that form the object action among the plurality of element actions for each divided section set by dividing the object period according to the acquired effective time on the basis of the acquired data.

Computer-readable recording medium storing information processing program, information processing method, and information processing device

A detection device generates plural attractors based on brainwave data. Subsequently, the detection device calculates a Betti number by subjecting the attractors to persistent homology transform. The detection device determines an onset of encephalopathy based on a first order component of a Betti sequence calculated based on the Betti number.

Non-transitory computer-readable recording medium, encephalopathy determination method, and information processing apparatus

A machine learning method includes: generating, by a computer, a sine wave using a basic period of input data having a periodic property; determining a sampling period based on a degree of roundness of an attractor generated from the sine wave; sampling the input data at the determined sampling period to generate a pseudo attractor; and performing a machine learning by using the pseudo attractor.

Method for analyzing time-series data based on machine learning and information processing apparatus

An apparatus obtains time series data to which a label indicating a category of classification is attached, where the time series data contains variations of target values during a period to which the label is attached. The apparatus divides the time series data into a plurality of sections, and generates an attractor for each of the plurality of sections where the attractor indicates a set of numerical values toward which the variations of the target values tends to evolve. The apparatus calculates a Betti sequence in accordance with the generated attractor for each of the plurality of sections, and obtains a feature for the Betti sequences of the plurality of sections by clustering the Betti sequences or by calculating a statistical quantity of the Betti sequences. The apparatus performs machine learning by using the obtained feature as an input.

Learning of a feature based on betti sequences obtained from time series data

In order to adequately suppress both an increase in NOx emission amount and deterioration of fuel consumption rate, the present invention provides a fuel injection control information generation device equipped with: a test point information storage unit for holding test point information including a plurality of test points constituted by sets of engine speed, fuel injection amount, and oxygen concentration; and a control information generation unit for generating, for each test point included in the test point information, fuel injection control information in which the engine speed, fuel injection amount, and oxygen concentration of the test point are associated with an optimum fuel injection timing at which an index pertaining to the total of a fuel consumption rate and an NOx emission amount in the test point becomes the smallest.

Fuel injection control information generation device and control device

A sensor output value estimation device that effectively estimates sensor output values reflecting a response delay of a temperature sensor. The device includes an estimated gas temperature calculation unit for calculating an estimated gas temperature of an engine on a basis of at least a running condition of the engine and a state quantity of the gas in the engine. The device also includes an estimated sensor output value calculation unit for calculating an estimated sensor output value reflecting the response delay of the temperature sensor on a basis of the calculated estimated gas temperature and a pre-stored first model formula specifying a relation among the temperature change time constant of the temperature sensor, the gas flow rate, and the gas temperature.

Sensor output value estimation device

According to one embodiment, a disk device rotates a disk information storage medium to record and reproduce information on the information storage medium by use of a head that slides in contact with a lubricant coated on the information storage medium, wherein a sliding speed U, area A and normal force N are set to cause U&#xd7;A/N to fall within a monotonously increasing region in which a coefficient of friction associated with a frictional force occurring in a contact area of the head that faces the information storage medium monotonously increases as U&#xd7;A/N increases, where the sliding speed U represents a sliding speed at a sliding time of the head, the area A represents the contact area of the head, and the normal force N represents a normal force applied to the contact area of the head.

Disk device

System for adjusting the pressure of a head on an information storage medium of a disk device

According to one embodiment, in a disk drive, a voice coil motor is controlled to cause a head to minutely vibrate in a radial direction on a track of a disk. When the voice coil motor vibrates the head in the radial direction of the disk, frictional force occurring between the disk and the head is calculated based on the driving force of the voice coil motor generated to vibrate and detected positional information, thereby measuring frictional characteristics.

Disk drive and method of measuring frictional characteristics

A method of detecting a gap between a head and a recording medium in an information-recording/reproducing apparatus that uses the head to record and reproduce information in and from the recording medium. In the method, the gap between the head and the recording medium is alternately increased and decreased, thereby gradually reducing the gap between the head and the recording medium. A detection signal is detected from which to determine a contact between the head or a slider supporting the head and the recording medium. When it is determined that the head or the slider has contacted the recording medium, the head is stopped and moved away from the recording medium to a prescribed position, and data representing a distance the head has moved to contact the recoding medium is acquired.

Information-recording/reproducing apparatus and method of detecting the gap between a head and a recording medium

A discretization processing method for transforming a transfer function in continuous time systems to a transfer function in discrete time systems is disclosed. To obtain the new transfer function, angular frequency &#x3c9;a of the original transfer function in continuous time systems is transformed to angular frequency &#x3c9;c using the bilinear z-transform of the inverse characteristic. In the discretion processing result, the equivalent characteristics of the original transfer function in continuous time systems can be obtained by performing the bilinear z-transform against the new transfer function in continuous time systems having been obtained by the angular frequency transformation of inverse characteristic.

Discretization processing method of transfer function in continuous time systems, system and program therefor, and compensator and feedback control system using the same

A track servo control perform follow-up control of an optical beam to a track of an optical disk, and control the vibration of the optical beam due to the ID pit noise of the optical disk. The control system is comprised of a feedback control block for feedback-controlling the actuator by the track error signal from the actuator and the learning control block. Since the optical disk ID pit noise is periodic noise, the learning control block learns this, inputs the learning result to the feedback control system. The learning result is subtracted from the learning input, and the signal after subtraction is learned in order to converge the learning. Therefore even if the periodic ID pit noise is applied, this noise can be removed from the control loop and the vibration of the actuator due to periodic noise can be decreased, making a stable track follow-up operation possible.

Track servo control method, track servo controller and optical storage device

The present invention implements a servo system which can support changes of the higher resonance frequencies of the actuator with a simple configuration at low cost. The servo system comprises a headwhich at least reads a diska carriagewhich drives the headto the track position of the diska detection circuitwhich detects a positional error with respect to the track from the read output of the head, and the servo control unitwhich controls the carriage such that the head follows up the track according to the positional error, wherein the servo control unitfurther comprises a digital filter for increasing gain so that the open loop characteristic of the tracking servo system by the servo control unit has a gain higher than the open loop gain of the phase cross-over frequency fin a frequency area which is higher than the phase cross-over frequency fbut lower than the higher resonance frequency fof the carriage and where the gain does not becomes OdB or more at a frequency where phase is (&#x2212;180+360&#xd7;N)&#xb0;. Since gain is increased, phase margin is increased.

Servo with digital filter to control gain in a frequency band where open loop characteristic is higher than the phase cross-over frequency and lower than resonance frequency

The invention relates to an information recording apparatus including a head that is disposed so as to face a recording medium, and records information in the recording medium and/or reproduces information therefrom, and a head actuator for moving the head toward and away from the recording medium. The apparatus further comprises a capacitor electrically charged by a power source; and a driving processor for driving the head actuator with electric charge accumulated in the capacitor in accordance with a voltage of the power source, and for retracting the head to a position away from the recording medium.

Apparatus for recording information and method for retracting the head

A digital servo controller generates a control signal from an analog observation signal using an output equation, state equation or a transfer function, and performs high precision servo-control with an inexpensive configuration. In a digital servo which executes an output equation yd&lsqb;k&rsqb;&equals;C&middot;x&lsqb;k&rsqb;&plus;D&middot;ud&lsqb;k&rsqb; and state equation x&lsqb;k&plus;1&rsqb;&equals;A&middot;x&lsqb;k&rsqb;&plus;B&middot;ud&lsqb;k&rsqb;. The digital servo comprises a digital processor which outputs the second term D&middot;ud&lsqb;k&rsqb; of the output equation by an analog circuit, and outputs the first term C&middot;x&lsqb;k&rsqb; earlier for Ts/2. The digital servo also has a digital processor which executes the direct term of the output equation at period Ts/N (N is a 2 or higher natural number), which is 1/N of the basic operation period Ts, and updates the first term with the same delay time as the average delay time Ts/(2N) of the direct term. Also the digital servo has a digital processor which outputs the term &agr; of the transfer function by the analog circuit, and outputs the other terms earlier for Ts/2. Also the digital servo has a digital processor which executes the term &agr; of the transfer function at period Ts/N which is 1/N of the basic operation period Ts, and updates the other terms with the same delay time as the average delay time Ts/(2N) of the direct term.

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Kawasaki, Japan

Yoshiaki Ikai