Abstract: In order to detect occurrence of an influence on quality of an optical signal due to a non-linear effect of an optical fiber, an optical receiver includes: a demodulation unit that demodulates a received optical signal and outputs a reception signal, and calculates a quality value indicating quality of the optical signal; an extraction unit that extracts, from the reception signal, transmission power being a value indicating optical power at a time of transmitting the optical signal; an arithmetic unit that determines a change rate of the quality value to the transmission power; and a monitoring unit that determines, based on a comparison result between the change rate and a predetermined threshold, an influence of a non-linear effect in the optical signal.

Abstract: This optical cell for sedimentation analysis has a pair of opposing surfaces through which light is transmitted, and two polarizing plates, in which each of the two polarizing plates is disposed in a crossed Nicols state on each of the inner surfaces of the pair of opposing surfaces.

Abstract: A vehicle movement assist system includes: an external environment sensor unmovably fixed to a vehicle; and a control device configured to acquire the position of an obstacle relative to the vehicle based on a result of detection performed by the external environment sensor and to execute an automatic moving process to autonomously move the vehicle. During execution of the automatic moving process, if the obstacle is detected in a recognition range set by the control device, the control device performs a notification to the driver and/or executes a process including deceleration or stopping of the vehicle. The control device is configured to change the recognition range in accordance with the travel state of the vehicle.

Abstract: An ultrasonic probe (100) includes an oscillator accommodating part (110), a first coil spring (130), and a collar (140). The oscillator accommodating part (110) has an accommodation shaft (116) having an ultrasonic oscillator (111a) accommodated therein, and a curved surface part (114) connected to one end portion of the accommodation shaft (116) and having formed thereon a curved surface (114a) facing a direction opposite to a direction in which the accommodation shaft (116) is present. The first coil spring (130) receives the curved surface (114a) of the curved surface part (114), and produces an elastic force pressing the curved surface (114a). The collar (140) accommodates the first coil spring (130) and the curved surface part (114), and restrains movement of the curved surface part (114) pressed by the first coil spring (130). The curved surface part (114) and the first coil spring (130) configure a spherical joint (100J).

Abstract: In order to stabilize the characteristics of reception of an optical signal received via a transfer path, this optical receiver is provided with: a local beam output means 1; a light receiving means 2; a photoelectric conversion means 3; a measuring means 4; a control means 5; and a comparing means 6, the comparing means 6, when the control means 5 sweeping the wavelength of the local beam in a predetermined wavelength range with respect to the central wavelength of the optical signal, generating difference data between a spectrum based on a result of the measuring, by the measuring means 4, of the electric signal in accordance with a change in the wavelength of the local beam and a preset reference spectrum.

Abstract: A non-transitory computer-readable storage medium storing a machine learning program that causes at least one computer to execute a process, the process includes acquiring a first training rate of a first layer that is selected to stop training among layers included in a machine learning model during training of the machine learning model; setting a first time period to stop training the first layer based on the training rate; and training the first layer with controlling the training rate up to the first time period.

Abstract: A computer-implemented method of a speed-up processing, the method including: calculating variance of weight information regarding a weight updated by machine learning, for each layer included in a machine learning model at a predetermined interval at time of the machine learning of the machine learning model; and determining a suppression target layer that suppresses the machine learning on the basis of a peak value of the variance calculated at the predetermined interval and the variance of the weight information calculated at the predetermined interval.

Abstract: A non-transitory computer-readable storage medium storing an information processing program that causes at least one computer to execute a process, the process includes acquiring a value that indicates a progress status of training for an input-side layer among a plurality of layers included in a machine learning model; and when the value is more than or equal to a threshold value, repeating acquiring each value for a plurality of layers that follows the input-side layer.

Abstract: A recording medium stores a machine learning program for causing a computer to execute processing including: acquiring, in deep learning of a model that includes layers, information that indicates a learning status for each iterative processing of learning processing; determining progress of learning based on the information that indicates the learning status; skipping a part of learning processing of each layer included in a first layer group from a input layer to a specific layer and in which the progress of the learning satisfies a condition; and restarting the part of the learning processing skipped when the part of the learning processing is skipped and a change amount of an evaluation value, which is based on the information that indicates the learning status, of any of layers included in a second layer group from a next layer of the specific layer to an output layer exceeds a threshold range.

Abstract: In order to stabilize the characteristics of reception of an optical signal received via a transfer path, this optical receiver is provided with: a local beam output means 1; a light receiving means 2; a photoelectric conversion means 3; a measuring means 4; a control means 5; and a comparing means 6, the comparing means 6, when the control means 5 sweeping the wavelength of the local beam in a predetermined wavelength range with respect to the central wavelength of the optical signal, generating difference data between a spectrum based on a result of the measuring, by the measuring means 4, of the electric signal in accordance with a change in the wavelength of the local beam and a preset reference spectrum.

Abstract: A non-transitory computer-readable recording medium storing a calculation processing program for causing a computer to execute processing, the processing including: calculating error gradients of a plurality of layers of a machine learning model that includes an input layer of the machine learning model at the time of machine learning of the machine learning model; selecting a layer of which the error gradient is less than a threshold as a suppression target of the machine learning; and controlling a learning rate and performing the machine learning on the layer selected as the suppression target in a certain period of time before the machine learning is suppressed.

Abstract: A computer-implemented method includes: calculating error gradients with respect to a plurality of layers included in a machine learning model at a time of machine learning of the machine learning model, the plurality of layers including an input layer of the machine learning model; specifying, as a layer to be suppressed, a layer located in a range from a position of the input layer to a predetermined position among the layers in which the error gradient is less than a threshold; and suppressing the machine learning for the layer to be suppressed.

Abstract: A memory holds a model including a plurality of layers including their respective parameters and training data. A processor starts learning processing, which repeatedly calculates an error of an output of the model by using the training data, calculates an error gradient, which indicates a gradient of the error with respect to the parameters, for each of the layers, and updates the parameters based on the error gradients. The processor calculates a difference between a first error gradient calculated in a first iteration in the learning processing and a second error gradient calculated in a second iteration after the first iteration for a first layer among the plurality of layers. In a case where the difference is less than a threshold, the processor skips the calculating of the error gradient and the updating of the parameter for the first layer in a third iteration after the second iteration.

Abstract: To make it possible to perform functional setting for an optical receiver from an optical transmitter using a simple configuration, an optical transmitter is provided with: a first transmit circuit which generates a first optical signal including a main signal; a second transmit circuit which generates a second optical signal including a control signal; and a first combiner which generates a channel signal in which the second optical signal is wavelength-multiplexed at one end of a wavelength band of the first optical signal.

Abstract: A test controller of a transmitting-side optical wavelength multiplexing transmission apparatus of the present invention includes a wavelength tunable filter controller configured to control a center wavelength and a wavelength band of an optical signal that a wavelength tunable filter transmits; and a test transponder controller configured to control a wavelength band of a test optical signal generated by a test transponder and a wavelength interval between the test optical signal and the optical signal that the wavelength tunable filter transmits. A test controller of a receiving-side optical wavelength multiplexing transmission apparatus of the present invention includes a wavelength tunable filter controller configured to control a center wavelength and a wavelength band of an optical signal that a wavelength tunable filter transmits; and a test transponder controller configured to control a center wavelength and a wavelength band of a test optical signal received by a test transponder.

Abstract: To provide an optical receiver that can economically obtain error correction capability equivalent to or greater than capability based on an error correction code. An optical receiver 2 includes: an optical branching unit 12 that branches a received optical signal into three optical signals, and outputs the optical signals; three of a first, a second, and a third optical receiving circuits 13, 14, and 15 each of which inputs one of the three branched optical signals, operates independently, and performs signal processing including an identification and reproduction process concerning an input optical signal and an error correction process based on the error correction code; and a bit determining circuit 19 that performs, in a bit unit, majority-decision determination on three signals on which error correction processes have been performed and that are output respectively from each optical receiving circuit.

Abstract: A test controller of a transmitting-side optical wavelength multiplexing transmission apparatus of the present invention includes a wavelength tunable filter controller configured to control a center wavelength and a wavelength band of an optical signal that a wavelength tunable filter transmits; and a test transponder controller configured to control a wavelength band of a test optical signal generated by a test transponder and a wavelength interval between the test optical signal and the optical signal that the wavelength tunable filter transmits. A test controller of a receiving-side optical wavelength multiplexing transmission apparatus of the present invention includes a wavelength tunable filter controller configured to control a center wavelength and a wavelength band of an optical signal that a wavelength tunable filter transmits; and a test transponder controller configured to control a center wavelength and a wavelength band of a test optical signal received by a test transponder.

Abstract: In order to identify occupied bands in an optical transmitter with high accuracy, a band identifying circuit includes an optical intensity controller configured to change, by a prescribed level, an optical intensity of an optical signal outputted from a target-of-identification optical transmitter among a plurality of optical signals respectively outputted from a plurality of optical transmitters, constituting a wavelength-multiplexed optical signal, and having mutually different wavelengths, a spectrum acquisition circuit configured to measure an optical intensity of each wavelength of the wavelength-multiplexed optical signal and output a result of the measurement as a spectrum, and a band identifier configured to identify a band occupied by the target-of-identification optical transmitter, based on a change amount of the outputted spectrum.

Abstract: Present invention provides an optical communication system that controls reception sensitivity of an optical receiver. The communication system (100) according to the present invention comprising: an optical transmitter (1) to which an transmission signal is input, and which modulates the transmission signal to an optical signal and transmits the optical signal; and an optical receiver (2) that receives the optical signal and demodulates the optical signal to an transmission signal.

Abstract: In order to identify occupied bands in an optical transmitter with high accuracy, a band identifying circuit includes an optical intensity controller configured to change, by a prescribed level, an optical intensity of an optical signal outputted from a target-of-identification optical transmitter among a plurality of optical signals respectively outputted from a plurality of optical transmitters, constituting a wavelength-multiplexed optical signal, and having mutually different wavelengths, a spectrum acquisition circuit configured to measure an optical intensity of each wavelength of the wavelength-multiplexed optical signal and output a result of the measurement as a spectrum, and a band identifier configured to identify a band occupied by the target-of-identification optical transmitter, based on a change amount of the outputted spectrum.