Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

Abstract: There is provided a data sharing technique in which it is possible to update data stored in a server before to such data that is decryptable on the communication terminal side using an updated session key without the data being decrypted on the server side, and a deleted user cannot decrypt the decryptable data. There are included: a generation identifier generation step of a data sharing server generating a generation identifier showing a generation of a group; a session key encryption step of a communication terminal to perform encrypted session key update using the generation identifier received from the data sharing server and a public parameter and a session key recorded in a recording part to generate an encrypted session key, which is a session key encrypted; and an encrypted session key management step of the data sharing server recording the encrypted session key received from the communication terminal to perform encrypted session key update as a currently valid encrypted session key.

Abstract: A collection unit (15a) collects information on IoT devices connected to IoT gateways and white lists of the IoT devices, retained by the IoT gateways. An extraction unit (15b) extracts white lists of IoT devices that satisfies a prescribed condition related to the number of the IoT devices of each model or the number of installed locations of the IoT devices of each model from the collected white lists of the IoT devices using the collected information on the IoT devices so as to create a tentative white list. A coupling unit (15c) couples the created tentative white list and the white lists retained by the respective IoT gateways together so as to create a white list applied to the respective IoT gateways.

Abstract: A classification apparatus includes: a crawler unit that acquires access result data for a website, the access result data including website application information, web server information, and the like that are updated by an administrator of the website; an update history generation unit that generates an update history of the website by making comparison in chronological order between pieces of information included in the access result data for the website; a classifier generation unit that generates a classifier that classifies a website having a possibility of being abused in the future, by using, as a feature value, the update history of the website; and a classification unit that classifies, through the classifier generated, the website having the possibility of being abused in the future.

Abstract: A nonverbal information generation apparatus includes a nonverbal information generation unit that generates time-information-stamped nonverbal information that corresponds to time-information-stamped text feature quantities and an expression unit that expresses the nonverbal information on the basis of the time-information-stamped text feature quantities and a learned nonverbal information generation model. The time-information-stamped text feature quantities are configured to include feature quantities that have been extracted from text and time information representing times assigned to predetermined units of the text. The nonverbal information is information for controlling the expression unit so as to express behavior corresponding to the text.

Abstract: An IQ optical modulator including: a parent Mach-Zehnder type (MZM) optical waveguide; child MZM optical waveguides constituting two arms of the parent MZM; two electrode transmission lines provided along the two arms of the child MZM, respectively, and receiving modulation signal to phase-modulate an optical signal; an RF extension line connected to the two electrode transmission lines, respectively; a first optical splitter branching light into the two arms of the parent MZM; a second optical splitter branching light into the two arms of the child MZM; and a first optical multiplexer multiplexing light from the two arms of the child MZM, wherein stripe direction of the child MZM optical waveguide is same as the RF extension line, the second optical splitter, and the first optical multiplexer, and is orthogonal to the first optical splitter.

Abstract: Methods, systems, and devices for leaving evidence of a contract on a blockchain with a simple method while having agreements made among the involved parties, maintaining the mode of one electronic signature per transaction, and maintaining credibility. Transactions of an issuing-party terminal, an agreeing-party terminal, and an agreeing-party terminal involved in contract agreement are linked as a chain, and the agreeing-party terminal at the end generates a transaction directed to the issuing-party terminal who has issued the contract. Each of these terminals previously generates a key pair for encryption of the contract and transmits the encryption key to a terminal which is its transaction sender. Then, this sender terminal encrypts a contract to be included in a transaction of the user of the sender terminal using the encryption key of the receiver of the transaction.

Abstract: A learning device includes a memory, and processing circuitry coupled to the memory and configured to receive an input of a plurality of series for learning having known accuracy, and learn a model represented by a neural network, the model being capable of determining accuracy levels of two series when given feature amounts of the two series among the plurality of series.

Abstract: A collection apparatus that collects a URL of a Web page that leads to user operation and includes a search query generation unit that generates a search query by combining a digital content name and an associated keyword of the digital content. There is a fitness prediction unit that predicts a degree to which a Web page that leads to user operation is output as a search result when a search is performed by using the generated search query, a determination unit that searches for a Web page by using a search query in a search order that is based on the predicted degree, and determines analysis priority of a URL of a Web page on the basis of the degree and search result information. Further, there is a communication unit that outputs the URL of the retrieved Web page and the analysis priority of the URL.

Abstract: A share [x]i of plaintext x in accordance with Shamir's secret sharing scheme is expressed by N shares [x0]i, . . . , [xN?1]i, and each share generating device Ai obtains a function value ri=Pm(i(?))(si) of a seed si, obtains a first calculated value ?i=?(i, i(?))[xi(?)]i+ri using a Lagrange coefficient ?(i, i(?)), a share [xi(?)]i, and the function value ri, and outputs the first calculated value ?i to a share generating device Ai(?). Each share generating device Ai accepts a second calculated value ?i(+), obtains a third calculated value zi=?(i, i(+))[xi]i+?i(+) using a Lagrange coefficient ?(i, i(+)), a share [xi]i, and the second calculated value ?i(+), and obtains information containing the seed si and the third calculated value zi as a share SSi of the plaintext x in secret sharing and outputs the share SSi.

Abstract: An encoding/decoding technique is provided with which encoding can be performed using a small average number of bits even for a sequence of integer values including small non-zero values and having a distribution heavily biased toward small values. The present invention includes an integer encoding part 110 that, with respect to an inputted sequence of non-negative integer values x_n, n?{1, 2, . . . , N} (hereinafter referred to as an “integer sequence”), obtains a 1-bit code as a code corresponding to a run of integer values 0 of length L, a predetermined number which satisfies 2?L?2K?1, which is included in the integer sequence and obtains a (K×x_n)-bit or (K×x_n+1)-bit code as a code corresponding to a set of a run of integer values 0 of length from 0 to L?1 and one non-zero integer value x_n included in the integer sequence, where K is assumed to be an integer equal to or larger than 2.

Abstract: A wearable electrode includes: a garment including an outer member and a backing member configured to cover at least a part of an inner surface of the outer member; and an electrode unit configured to come into contact with a living body clothed in the garment to acquire a biological signal emitted by the living body and attached to an opposite side of the backing member from the outer member, and a core wire which can be inserted into an accommodation section formed in the electrode unit. The outer member and the backing member are connected to a part other than a part of the backing member, to which the electrode unit is attached.

Abstract: A signal-to-noise ratio (SNR) estimation method includes an optical signal transmission step of inserting at least one pair of signal sequences into transmission data and transmitting the transmission data into which the at least one pair of signal sequences is inserted, a signal sequence extraction step of extracting the at least one pair of signal sequences from a received signal obtained by receiving the transmitted transmission data, an inner product calculation step of calculating an inner product value of the extracted at least one pair of signal sequences, a reception power calculation step of calculating reception power of the extracted at least one pair of signal sequences, and an SNR calculation step of calculating an SNR of the at least one pair of signal sequences on the basis of the calculated inner product value and the calculated reception power.

Abstract: A repetitive structure extraction device includes an image feature extraction unit which extracts an image feature for each of a plurality of images which are captured at one or a plurality of locations and which are given different capture times, a temporal feature extraction unit which extracts, for each of the plurality of images, a temporal feature according to a predetermined period from a capture time given to the image, and a repetitive structure extraction unit which learns, on the basis of the image feature extracted for each of the plurality of images by the image feature extraction unit and the temporal feature extracted for each of the plurality of images by the temporal feature extraction unit, a repetitive structure which is used to perform interconversion between the temporal feature and a component of the image feature and which is provided according to a correlation of periodic change between the component of the image feature and the temporal feature.

Abstract: A key exchange technique of performing a key exchange among N (?2) parties, which can conceal metadata on communication, is provided. A key exchange method includes: a first key generation step in which a communication device Ui generates a first key; a first anonymous broadcast step in which the communication device Ui anonymously broadcasts the first key with a set R?{Ui} being designated for i?{1, . . . , n} and the communication device Ui anonymously broadcasts the first key with ? being designated for i?{n+1, . . . , N}; a second key generation step in which the communication device Ui generates a second key; a second anonymous broadcast step in which the communication device Ui anonymously broadcasts the second key with the set R?{Ui} being designated for i?{1, . . . , n} and the communication device Ui anonymously broadcasts the second key with ? being designated for i?{n+1, . . . , N}; and a session key generation step in which the communication device Ui generates a session key SK for i?{1, . . .

Abstract: An anomaly detection apparatus having a function of an autoencoder that includes an input layer, hidden layers, and an output layer, and that learns parameters such that data of the input layer is reproduced in the output layer, the anomaly detection apparatus including: input means that input normal data of a plurality of types; learning means that learn parameters such that normal data of the input layer is reproduced in the output layer by learning a feature across data types using data of a dimension which is smaller than a dimension of the normal data; and anomaly degree calculation means that input test data to the autoencoder using the parameters learned by the learning means, and calculate anomaly degree of the test data based on output data of the autoencoder and the test data.

Abstract: A monitoring device (10) monitors traffic of a network. The monitoring device (10) collects at least one of first information, which is information concerning a first packet transmitted to an address not used in the Internet, and second information, which is information concerning a second packet transmitted to a specific destination set as a decoy. The monitoring device (10) determines, based on information concerning the traffic monitored by the monitoring device (10) and the information collected by monitoring device (10), whether an attack occurs.

Abstract: Provided are n antennas and n power change units; a power control unit; a power change management unit managing a common power change amount and an individual power change amount; a common power notification unit notifying the power control unit of the common power change amount in accordance with a target terminal; an individual power notification unit notifying the power control unit in advance of the individual power change amount in accordance with the each terminal at a prescribed timing, in which the power control unit stores the individual power change amount in a storage unit, and performs control of power changing by adding up the common power change amount in accordance with the target terminal, which is notified from the common power notification unit, and the individual power change amount.

Abstract: An optical receiver that demodulates an optical modulation signal into a baseband signal, which is an electrical signal, and decodes a received symbol acquired by converting the baseband signal. The optical receiver includes: an analog-to-digital converter that converts the baseband signal into a digital signal of which the number of samples per received symbol is M/N (samples/symbol), M and N being positive integers, M/N being not an integer, and “M>N” being satisfied; and an adaptive equalization processing unit that executes an equalization operation set in advance to output the received symbol on the basis of the digital signal of which the number of samples per received symbol is M/N (samples/symbol) and a predetermined tap coefficient digital signal equalization tap coefficients used for equalization of a signal, the coefficient being updated in any sampling period.

Abstract: A control unit of a bias control circuit performs a loop process that fixes a second bias voltage and iterates a process of recording a pair of a first candidate bias voltage and a second candidate bias voltage that are a first bias voltage when optical power of a multi-level QAM signal output by an optical modulator is controlled so that the optical power converges to a value in the vicinity of the maximum value or the minimum value before and after a third bias voltage is increased or decreased by a half-wave voltage while changing the second bias voltage within a predetermined range. The control unit calculates the difference between the first candidate bias voltage and the second candidate bias voltage for each of a plurality of recorded pairs and determines a value between first candidate bias voltage and the second candidate bias voltage of a pair selected on the basis of the calculated difference as the value of the first bias voltage.