Kabushiki Kaisha Toshiba

Canon Medical Systems Corporation

Masanori Furuta

Tetsuro Itakura

Akihide Sai

Hideyuki Funaki

Go Kawata

Shunsuke Kimura

Junya Matsuno

Hidenori Okuni

Kentaro Yoshioka

Hirokatsu Shirahama

Satoshi Kondo

Kei Shiraishi

Daisuke Kurose

Tuan Thanh Ta

Tsutomu Sugawara

Takafumi Yamaji

Hirotomo Ishii

Mari Matsumoto

Tomohiko Ito

Tomohiko Sugimoto

Yasuhiro Shinozuka

Mai Nozawa

Hiroshi Kubota

Tetsuro Kimura

Mizuki Ono

Kohei Onizuka

Taichi Ogawa

Takayuki Takida

Yohei Hatakeyama

Takumi Kurosaka

Naoya Waki

Ryota Tamura

Nobuo Kano

Mai Araki

A learning system according to an embodiment includes a model generation device and n calculation devices. The model generation device includes a splitting unit, a secret sharing unit, and a share transmission unit. The splitting unit splits m×n pieces of training data into n groups each including m training data pieces, the n groups corresponding to the respective n calculation devices on one-to-one basis. The secret sharing unit generates m distribution training data pieces for each of the n groups by distributing using a secret sharing scheme and generates distribution training data for each of the m training data pieces in an i-th group among the n groups, using an i-th element Pi among n elements P1, P2, . . . , Pi, . . . , Pn, by distributing using the secret sharing scheme. The share transmission unit transmits corresponding m distribution training data pieces to each of the n calculation devices.

Learning system, learning method, and computer program product

According to an embodiment, an information processing device is configured to assign a first computing device one or more first tasks of processing respective one or more first partial data of a plurality of partial data included in an n-dimensional target data, n being an integer greater than or equal to 2, the target data being to be processed using a neural network, the one or more first partial data including first data and second data adjacent to the first data in a direction of m-dimension, m being an integer satisfying 1≤m≤n; and instruct the first computing device to execute a second task included in the one or more first tasks, according to an execution status of second partial data of the plurality of partial data included in the target data, the second partial data being executed by the second computing device.

Information processing device, information processing method, and computer program product

According to one embodiment, a secure computing method includes setting a coefficient selected from a ring of integers Q based on first data X, generating n pieces of first fragment data from the first data X based on the coefficient, causing a learning model held in the computing device to learn the first fragment data, generating n pieces of second fragment data from second data Z based on the coefficient, performing, by each of the n computing devices, inference based on the second fragment data using the learning model, and obtaining decoded data dec by decoding k pieces of inference result data. The coefficient is set to make each of the n pieces of first fragment data less than a maximum value of the ring of integers Q.

Secure computing method, secure computing system, and secure computing management device

An information processing system includes a server device and one or more edge systems. The server device includes a memory, and one or more processors coupled to the memory and configured to: receive a plurality of first stream data to which first time information is associated from the edge systems; receive reference information in which second time information and the first time information corresponding to the selected first stream data are associated to each other, from the edge systems; receive an acquisition request of the first stream data corresponding to third time information expressed in the same format as the second time information; and identify the first stream data to which the first time information corresponding to the third time information is associated based on the reference information.

Information processing system, server device, and computer program product

An information processing device has a digital-to-pulse converter which outputs a pulse signal including a pulse having a pulse length in accordance with a digital input signal, and a selective oscillator which performs an oscillation operation while the pulse of the pulse signal is output and holds an oscillation operation state at a point of time where the output of the pulse is stopped.

Information processing device, semiconductor device, and information processing method

According to an embodiment, a radiation measuring apparatus includes a detector, comparators, a threshold controller, counters, and a generator. The detector includes plural detecting elements each configured to convert energy of incident radiation into a first electrical signal. The comparators correspond to the respective detecting elements, each comparator being configured to output a second electrical signal when a level of the corresponding first electrical signal is not less than a threshold. The threshold controller is configured to supply a first value as the threshold to the respective comparators at a first time, and supply a second value as the threshold to the respective comparators at a second time. The counters correspond to the respective comparators, each counter being configured to count the corresponding second electrical signal. The generator is configured to generate a pulse height frequency distribution of the radiation by using counts of the counters.

Radiation measuring apparatus, computer program product, and radiation computed tomography apparatus

A time to digital converter has a counter to measure the number of cycles of a first signal, a first phase difference detector to generate a phase difference signal having a pulse width corresponding to a phase difference, a first capacitor to be charged with an electric charge, a second capacitor including capacitance N times the capacitance of the first capacitor, the N being a real number larger than 1, a comparator to compare a charge voltage of the first capacitor and a charge voltage of the second capacitor, a first charge controller to continue to charge the second capacitor until the comparator detects that the charge voltage of the second capacitor has reached the charge voltage of the first capacitor or more, and a first phase difference arithmetic unit to operate the phase difference between the first signal and the second signal.

Time to digital converter, phase difference pulse generator, radio communication device, and radio communication method

A receiver has a receiving unit to receive a radio signal, a signal detector to detect a reception signal in each of a plurality of set periods shifted in time to be overlapped in a partial period, and a demodulating unit to perform demodulation processing based on the reception signal. The signal detector has a smoothing unit to smooth the output signal of the receiving unit in each of the plurality of set periods, a comparing unit to output a signal obtained by comparing a level of the smoothed signal, with a threshold value, and an initializing unit to initialize the signal smoothed by the smoothing processing unit, every time the comparing unit compares the smoothed signal with the threshold value, and the demodulating unit performs the demodulation processing based on the smoothed signal determined to be the threshold value or more by the comparing unit.

Receiver and radio communication device

A waveform shaping filter according to an embodiment includes at least one filter stage and a control circuit. The filter stage includes a differentiation signal generation circuit, a proportional signal generation circuit, and an adder circuit. The differentiation signal generation circuit generates a differentiation signal obtained by amplifying a differentiation component of an input signal. The proportional signal generation circuit generates a proportional signal obtained by amplifying the input signal. The adder circuit outputs an output signal obtained by adding the proportional signal and the differentiation signal. The control circuit compares the output signal and a first detection level, detects at least one of an overshoot and an undershoot of the output signal, and controls a time constant of the filter stage, based on a detection result.

Waveform shaping filter, integrated circuit, radiation detection device, method for adjusting time constant of waveform shaping filter, and method for adjusting gain of waveform shaping filter

A time to digital converter has a counter, a first phase difference detector, a first capacitor, a second capacitor having capacitance N times a capacitance of the first capacitor, a comparator to compare a charge voltage of the first capacitor with a charge voltage of the second capacitor, a first charge controller, a first phase difference arithmetic unit, a second phase difference detector, a second charge controller, a second phase difference arithmetic unit to operate the phase difference between the first signal and the second signal, and a third phase difference arithmetic unit to detect a fractional phase difference between the first signal and the second signal. The first phase difference arithmetic unit operates the phase difference between the first signal and the second signal, based on a reference phase, when the counter suspends a measurement operation.

Time to digital converter, radio communication device, and radio communication method

A radiation detection apparatus according to an embodiment includes a radiation detector that detects radiation; a first measurer that measures energy of the radiation from the radiation detected by the radiation detector; and a second measurer that measures the number of times that the radiation detector detects the radiation.

Radiation detection apparatus

A receiver has an oscillator to output an oscillation signal, a receiver to perform reception processing of a reception signal, a phase frequency detector to output a first signal in response to a phase and a frequency of the oscillation signal so as to generate a second signal indicating a reference phase, a differentiator to generate a third signal being a difference between the first signal and the second signal, an oscillator controller to generate a fourth signal for controlling a phase and a frequency of the oscillator, a phase initializer to output an initialization signal for synchronizing a phase of the second signal with a phase of the first signal, a trigger signal generator to output a trigger signal indicating timing with which the phase initializer outputs the initialization signal, and a power supply controller to control whether to supply a power supply voltage.

Receiver, radio communication device, and radio communication method

A successive approximation register (SAR) analog-to-digital converter includes a first capacitance digital-to-analog converter (CDAC), a first comparator configured to compare a voltage of an output signal from the first CDAC with a reference voltage, a first SAR circuit configured to control the first CDAC based on an output of the first comparator, a second CDAC to which the output signal from the first CDAC is input, a second comparator configured to compare a voltage of an output signal from the second CDAC with a reference voltage, a second SAR circuit configured to control the second CDAC based on an output of the second comparator and generate a digital signal representing a residual voltage of the output signal of the first CDAC, and a feedback circuit configured to delay the digital signal, generate a residual signal from the delayed digital signal, and output the residual signal to the first CDAC.

Successive approximation register analog-to-digital converter

A pulse detection circuit according to an embodiment includes a conversion circuit, a delay circuit, first and second comparators, a latch, and a generation circuit. The conversion circuit converts an input signal into a thermometer code signal. The delay circuit outputs a delay signal being the thermometer code signal delayed by a predetermined delay time. The first comparator (The second comparator) compares the thermometer code signal with the delay signal and outputs an increase signal (a decrease signal) indicating whether the input signal is larger (smaller) than the input signal before the delay time. Based on the increase signal and the decrease signal, the latch outputs an increase-decrease signal indicating whether the input signal is increasing or decreasing. Based on the thermometer code signal and the increase-decrease signal, the generation circuit generates a pulse detection signal and a pileup detection signal.

Pulse detection circuit, radiation detection circuit, and radiation detection apparatus

A radio communication device has a local oscillator to generate a local signal, a first mixer to mix a binary continuous phase frequency shift keying signal and the local signal so as to generate a baseband signal, a first filter to remove an unnecessary frequency component included in the baseband signal, a delay device to delay an output signal of the first filter by one symbol, and a wave detector to demodulate the continuous phase frequency shift keying signal, wherein a modulation index m of the continuous phase frequency shift keying signal is a value expressed by m=n+k where 0&#x3c;n&#x3c;1 is satisfied and k is an integer of 0 or more, and a frequency of the local signal is a frequency shifted by a frequency corresponding to 0 or 1 of the continuous phase frequency shift keying signal.

Growing community of inventors

Odawara, Japan

Masanori Furuta