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Nippon Telegraph And Telephone Corporation patents


Recent patent applications related to Nippon Telegraph And Telephone Corporation. Nippon Telegraph And Telephone Corporation is listed as an Agent/Assignee. Note: Nippon Telegraph And Telephone Corporation may have other listings under different names/spellings. We're not affiliated with Nippon Telegraph And Telephone Corporation, we're just tracking patents.

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Analysis method, analysis device and analysis program

In order to detect an attack to a web application accurately by accurately correlating different types of events having occurred in the same server, an event acquiring unit acquires a log of events containing a http request to a server, an event correlator creates a set of the request and events relevant to the request as an event block by using process ids of processes having processed events contained in the log, and an attack detector contrasts the event block that is created from the log of events in which an attack is to be detected with an event block that is created from normal events to calculate a degree of similarity and, when the degree of similarity is equal to or lower than a threshold, detects the event block as an event block containing an event that is abnormal due to an attack.. . ... Nippon Telegraph And Telephone Corporation

Linear predictive analysis apparatus, method, program and recording medium

An autocorrelation calculating part calculates autocorrelation ro(i) from an input signal. A predictive coefficient calculating part performs linear predictive analysis using modified autocorrelation r′o(i) obtained by multiplying the autocorrelation ro(i) by a coefficient wo(i). ... Nippon Telegraph And Telephone Corporation

Linear predictive analysis apparatus, method, program and recording medium

An autocorrelation calculating part calculates autocorrelation ro(i) from an input signal. A predictive coefficient calculating part performs linear predictive analysis using modified autocorrelation r′o(i) obtained by multiplying the autocorrelation ro(i) by a coefficient wo(i). ... Nippon Telegraph And Telephone Corporation

User estimation apparatus, user estimation method, and user estimation program

A user estimation apparatus according to the present invention includes an extraction unit (11) that extracts at least either order of page transitions on a website by a user or a time interval of a transition to each page, as a feature amount of page browsing by the user, from data which is to be learned and represents a request by the user to the website, and the extraction unit extracts at least either order of page transitions on the website or a time interval of a transition to each page, as a feature amount of page browsing by any user, from data which is to be estimated and represents requests by the users to the website, a learning unit (12) that creates a model indicating a feature of page browsing for each user, by learning the extracted feature amount, which is to be learned, of page browsing by each user, and an estimation unit (14) that refers to the feature amount, which is to be estimated, of page browsing by the user, and the model, and estimates who the user is among users.. . ... Nippon Telegraph And Telephone Corporation

Optical signal processing device

The present invention provides an optical signal processing device with a transponder aggregator function by which theoretical loss is not increased even if the number of necessary transponders is increased. Optical signals inputted from input ports are inputted to a plc. ... Nippon Telegraph And Telephone Corporation

Semiconductor optical modulation element

To provide a mach-zehnder (mz) type semiconductor optical modulation element that can be used as a modulator, which is ultrafast and excellent in electrical stability. A semiconductor optical modulation element of a mach-zehnder type that performs modulation of light using a refractive index modulation region where a refractive index of the light guided to an optical waveguide is modulated and an input and output region where multiplexing/demultiplexing of the light split in the refractive index modulation region is performed, characterized in that in the refractive index modulation region of the optical waveguide, an n-type clad layer, an i core layer, and a p-type clad layer are stacked in the order from a top layer on a substrate surface equivalent to a (100) plane of a sphalerite-type semi-insulating semiconductor crystal substrate, the n-type clad layer is formed in a ridge shape in an inverted mesa direction, and a capacitance-loaded electrode is provided on the n-type clad layer.. ... Nippon Telegraph And Telephone Corporation

Secure computation apparatus, secure computation method and program

A secret sharing value of a value represented by a “first target bit string” is used to obtain a secret sharing value of a value represented by a “first check bit string” obtained by setting a value of the most significant bit of the “first target bit string” to a value of a “first check bit” that is lower than the most significant bit. Here, the “first target bit string” corresponds to a null value when the most significant bit is 1 and corresponds to a real number when the most significant bit is 0. ... Nippon Telegraph And Telephone Corporation

Digital signal processing device and optical transceiver apparatus

Signal processing sections selectively switch modulation/demodulation in low-efficiency modulation system and modulation/demodulation in high-efficiency modulation system, and perform digital signal processing. Parallel-side interfaces of input/output interface sections are electrically connected to the signal processing section. ... Nippon Telegraph And Telephone Corporation

Database system and database processing method

A database system comprises a determining part 13 determining whether or not to conceal information to be registered in a database, a terminal device 1 that, if the determining part 13 determines that the information is to be concealed, generates n information fragments by secret-sharing the information and sends the n information fragments to a system management device 2, where n is a predetermined positive integer, the system management device 2 sending the n information fragments received from the terminal device 1 to n different database devices 3, and n database devices 3 each storing one of n information fragments received from the system management device 2.. . ... Nippon Telegraph And Telephone Corporation

Url matching apparatus, url matching method, and url matching program

A url matching apparatus generates partial character string information storing therein, as keys of an associative array, partial character strings obtained by connecting stepwise in order from a character string of an upper layer of a hierarchical structure of one or more reference urls. The url matching apparatus generates partial character strings obtained by connecting stepwise in order from a character string of an upper layer of a hierarchical structure, also for a url to be matched, and for each of these partial character strings of the url to be matched, searches the partial character string information with that partial character string being a key. ... Nippon Telegraph And Telephone Corporation

Station-side device and communication method

A station-side device performs transmission and reception of an optical signal to and from a subscriber-side device, and includes a communication control unit configured to perform optical signal communication using a plurality of wavelengths by wavelength division multiplexing and time division multiplexing; and a registration unit configured to set an acceptance period in at least one wavelength among the plurality of wavelengths, to perform a new registration of a subscriber-side device in response to a registration request of the subscriber-side device received within the acceptance period, and not to set the acceptance period in at least one other wavelength among the plurality of wavelengths.. . ... Nippon Telegraph And Telephone Corporation

Subscriber device and light receiving method

A subscriber device includes a demultiplexer configured to demultiplex input wavelength-multiplexed light into a plurality of light signals for each wavelength, a plurality of light receivers configured to receive each of the plurality of light signals obtained through demultiplexing by the demultiplexer and to convert the light signals into electrical signals, a plurality of limiting amplifiers configured to amplify each of the plurality of electrical signals output from the plurality of light receivers, and a plurality of signal selection units configured to select a plurality of signals to be received from among a plurality of amplified signals output from the plurality of limiting amplifiers.. . ... Nippon Telegraph And Telephone Corporation

Coherent optical mixer circuit

A coherent optical mixer circuit is provided that can measure a phase error without requiring a step of cutting away a delay circuit. Odd-numbered or even-numbered two of four inputs of an 4-input-and-4-output multimode interference circuit are connected to an input mechanism. ... Nippon Telegraph And Telephone Corporation

Polarization multiplexing optical transmission circuit and polarization multiplexing optical transmission and reception circuit

A one chip-integrated digital coherent polarization multiplexing optical transmission and reception circuit with optimal optical power distribution between sending and receiving is provided by using an optical power splitter having a branching ratio of a lower asymmetry property so that the unbalanced loss depending on the polarization path can be compensated. A polarization multiplexing optical transmission and reception circuit includes a polarization multiplexing optical transmission circuit, including: the first optical power splitter for branching the optical power of continuous light outputted from a light source; one polarization optical modulation circuit at the side of a path having a higher loss connected to one output of the first optical power splitter; the second optical power splitter connected to the other output of the first optical power splitter; and the other polarization optical modulation circuit connected to one output of the second optical power splitter.. ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180138979

Optical communication system and optical communication method

An optical communication system includes a signal processing apparatus and a wireless apparatus between which functions of a base station are divided, wherein a periodic symbol sequence including a cyclic prefix appended to a signal of a predetermined size to which an ifft (inverse fast fourier transform) has been applied is transmitted between the signal processing apparatus and the wireless apparatus by means of digital rof (radio over fiber) transmission, the signal processing apparatus and the wireless apparatus each include a transmission unit and a reception unit, the transmission unit includes: a first separation unit that acquires symbol information relating to a starting position of the symbol sequence and lengths of symbols constituting the symbol sequence, and that equalizes the lengths of the symbols by separating a portion of the symbol sequence based on the acquired symbol information; and a compression unit that compresses symbols that are to be compressed from which the separated portion of the symbol sequence has been removed, and the reception unit includes an expansion unit that expands the compressed symbols and restores the symbols.. . ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180138952

Wireless signal transmitting method and wireless apparatus

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.. ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180138925

Decoding apparatus, decoding method and program

To reduce the processing amount of a field multiplication. A denotes a k-th order vector whose elements are a0, . ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180138350

Light-receiving element and optical integrated circuit

A light-receiving element (10) according to the present invention includes a semiconductor layer (100) including a p-type semiconductor region (101), an n-type semiconductor region (102), and a multiplication region(103), and a p-type light absorption layer (104) formed on the multiplication region. The p-type semiconductor region and the n-type semiconductor region are formed to sandwich the multiplication region in a planar direction of the semiconductor layer. ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180137873

Gain adjustment coding for audio encoder by periodicity-based and non-periodicity-based encoding methods

In an encoding method that is expected to produce a smaller code amount out of a periodicity-based encoding method and a non-periodicity-based encoding method, the amount of code or an estimated value of the amount of code of an integer value sequence which is derived from an audio signal is obtained while adjusting gain. In the other encoding method, an integer value sequence obtained in this process is substituted to obtain the amount of code or an estimated value of the amount of code of the integer value sequence. ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180137872

Gain adjustment coding for audio encoder by periodicity-based and non-periodicity-based encoding methods

In an encoding method that is expected to produce a smaller code amount out of a periodicity-based encoding method and a non-periodicity-based encoding method, the amount of code or an estimated value of the amount of code of an integer value sequence which is derived from an audio signal is obtained while adjusting gain. In the other encoding method, an integer value sequence obtained in this process is substituted to obtain the amount of code or an estimated value of the amount of code of the integer value sequence. ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180137281

Software analysis system, software analysis method, and software analysis program

In accordance with codes of applications, it is determined whether the applications access predetermined privacy information due to permission, a first label is assigned to an application that is determined to make an access, and a second label to an application that is determined not to make an access. The score of each word is calculated such that a high score is set to a word that is included in the text of the description of the application, to which the first label is assigned, more often than in the text of the description of the application, to which the second label is assigned, and a predetermined number of words at the top with regard to the score is extracted. ... Nippon Telegraph And Telephone Corporation

05/17/18 / #20180136392

Optical waveguide device

In the case of implementing a polarization separation circuit, a polarization rotator, and the like by inserting a thin-film element into a substrate in one optical interference circuit, one common large-sized groove shared among a plurality of thin-film elements for their insertion has been formed. The optical waveguide type device of the present invention is configured such that at least one groove intersects only one corresponding optical waveguide for inserting the thin-film element and does not intersect other optical waveguides adjacent to the one corresponding optical waveguide. ... Nippon Telegraph And Telephone Corporation

05/10/18 / #20180131795

Telephone switching apparatus and method, and program

In a telephone switching apparatus equipped with an automatic call recording function, when recording of a call is started, a pb signal cannot be sent by operating a button any longer. Further, a user mistakenly assumes that there is a problem because the pb signal cannot be sent. ... Nippon Telegraph And Telephone Corporation

05/10/18 / #20180131462

Station-side device and wavelength changeover monitoring method

A station-side device of the present invention includes: a wavelength change instruction unit that issues, to a subscriber-side device, a wavelength change instruction to change a transfer-source wavelength assigned to the subscriber-side device to a transfer-target wavelength different from the transfer-source wavelength; a transfer-source port that transmits and receives an optical signal of the transfer-source wavelength; a transfer-target port that transmits and receives an optical signal of the transfer-target wavelength; a transfer-source port monitoring unit that detects a connection between the transfer-source port and the subscriber-side device; a transfer-target port monitoring unit that detects a connection between the transfer-target port and the subscriber-side device; a transfer-source timer that counts, at the transfer-source port, an elapsed time from a predetermined starting time in response to the wavelength change instruction, and ends the counting of the elapsed time in a case where change to the transfer-target wavelength is complete; and a transfer-target timer that counts, at the transfer-target port, an elapsed time from a predetermined time in response to the wavelength change instruction, and ends the counting of the elapsed time in a case where the change to the transfer-target wavelength is complete.. . ... Nippon Telegraph And Telephone Corporation

05/10/18 / #20180131461

Station-side device and wavelength changeover method

In a case where a wavelength to be assigned to a subscriber-side device, to which a downstream wavelength has been assigned, is to be changed from the currently used (source) downstream wavelength to a different changeover target (target) downstream wavelength, a downstream wavelength changeover instruction message that indicates the change target wavelength is generated. In a case where a wavelength to be assigned to the subscriber-side device, to which an upstream wavelength has been assigned, is to be changed from the currently used (source) upstream wavelength to a different changeover target (target) upstream wavelength, an upstream wavelength changeover instruction message that indicates the change target wavelength is generated. ... Nippon Telegraph And Telephone Corporation

05/10/18 / #20180130661

Semiconductor device and method of manufacturing the same

A third semiconductor layer (105) including a third nitride semiconductor is provided between an electrode (110) and a second semiconductor layer (104) including a second nitride semiconductor. The band gap of the second nitride semiconductor is set such that the carrier movement between a first semiconductor layer (103) and the third semiconductor layer (105) via the second semiconductor layer (104) is rate-determined by a diffusion process. ... Nippon Telegraph And Telephone Corporation

05/03/18 / #20180123780

Secret sharing method, secret sharing system, distributing apparatus and program

Computational complexity is reduced in accordance with given k and n. A random number generation unit 12 generates random numbers r0 to rk-2 ∈gf(xq). ... Nippon Telegraph And Telephone Corporation

04/19/18 / #20180109296

Antenna control apparatus, antenna control program, and antenna control system

Provided is an antenna control technique for forming the boundary of a communication area at a desired location. An antenna parameter control apparatus 2 calculates an antenna parameter in a case of feeding electric currents with an equal intensity in mutually reverse directions to two antennas 1a, 1b which generate a magnetic field. ... Nippon Telegraph And Telephone Corporation

04/19/18 / #20180107629

Matrix application apparatus, matrix application method and program

To reduce the processing amount of a field multiplication. A matrix application apparatus computes a vector b by multiplying a vector a and a matrix a, provided that a denotes a k-th order vector having elements a0, . ... Nippon Telegraph And Telephone Corporation

04/12/18 / #20180103059

Connection control apparatus, connection control method, and connection control program

A connection control apparatus is configured such that a connection count calculator calculates a tcp connection count, which is the number of tcp connections established between a server and one or more clients on a network, of each of servers on the network. The connection control apparatus is configured such that, when a determiner determines that the calculated count is larger than or equal to a predetermined threshold value, an anomalous connection detector detects anomalous connection, and a packet controller controls packet transmission and reception over the anomalous connection.. ... Nippon Telegraph And Telephone Corporation

03/15/18 / #20180077686

Terminal station device and bandwidth allocation method

Information on allocation of a bandwidth of uplink communication of each of user devices is extracted from information notified from an upper-level device on the uplink communication of the user devices. Correspondence information is created to indicate a correspondence among the upper-level device, the terminal device, the lower-level device, and the user device. ... Nippon Telegraph And Telephone Corporation

03/08/18 / #20180068095

Processing equipment and remote management system

A processing equipment includes a processing unit having a plurality of functions. A retaining unit retains a device identifier capable of identifying the processing equipment. ... Nippon Telegraph And Telephone Corporation

03/08/18 / #20180064397

Device and method for sequential posture identification and autonomic function information acquisition

A wearable device attached to a subject includes an accelerometer that measures acceleration information, and a biological sensor that measures biological signal information of the subject. From the measured acceleration information and biological signal information, first feature data corresponding to a first predetermined period and second feature data corresponding to a second predetermined period are extracted. ... Nippon Telegraph And Telephone Corporation

03/01/18 / #20180063831

Terminal station device and bandwidth allocation method

Information on allocation of a bandwidth of uplink communication of each user device is extracted from information notified by an upper-level device on the uplink communication of the user devices. Identification information of a lower-level device connected to a terminal device and identification information of the user devices are stored in correlation with each other. ... Nippon Telegraph And Telephone Corporation

03/01/18 / #20180063146

Black list generating device, black list generating system, method of generating black list, and program of generating black list

A blacklist generating device acquires a malicious communication log and a normal communication log. A malicious communication profile extracting function calculates statistics on communication patterns included in the malicious communication log and outputs a communication pattern satisfying a certain condition to a potential blacklist. ... Nippon Telegraph And Telephone Corporation

03/01/18 / #20180062746

Station-side device and optical transmission system

A selection and distribution circuit (13) is provided between n optical transceivers (11) and one pon control circuit (12). The selection and distribution circuit (13) selects the optical transceiver (11) corresponding to an upstream frame that time-divisionally arrives, thereby transferring the upstream frame opto-electrically converted by the transceiver (11) to the pon control circuit (12) and distributing a downstream frame from the pon control circuit (12) to each optical transceiver (11). ... Nippon Telegraph And Telephone Corporation

02/22/18 / #20180054810

Wireless communication system, wireless communication method, wireless lan access point, and wireless lan station

In a wireless communication system in which an ap and a plurality of stas are connected to each other and the ap simultaneously transmits a wireless frame destined for each sta with fdma, in which the ap includes a control frame transmission unit that generates a control frame having information on a frequency resource allocated to the each sta and transmits the control frame on a primary channel being used in a shared manner by the each sta and a wireless frame transmission unit that simultaneously transmits the wireless frame destined for the each sta on the frequency resource allocated to the each sta, and in which the sta includes a frequency resource selection reception unit that receives the control frame on the primary channel and receives a wireless frame destined for the sta itself on a frequency resource notified by the control frame.. . ... Nippon Telegraph And Telephone Corporation

02/22/18 / #20180053442

Share recovery system, share recovery apparatus, share recovery method, and program

An efficient share recovery technique for shamir's secret sharing is provided. N share recovery apparatuses p1, . ... Nippon Telegraph And Telephone Corporation

02/22/18 / #20180052278

Optical fiber design method

An object is to provide a beam propagating method capable of satisfying desired output power and a desired propagation distance and a required condition of beam quality and a method of designing an optical fiber designing the structure of an optical fiber. According to the present invention, an effective core cross-sectional area aeff is calculated based on desired specification values and, by appropriately adjusting the structure of an optical fiber satisfying the effective core cross-sectional area and the number of modes to be propagated, the structure of the optical fiber is determined. ... Nippon Telegraph And Telephone Corporation

02/15/18 / #20180048620

Name identification device, name identification method, and recording medium

A name identification device includes a generation unit configured to generate graph information in which each node represents one of names and ip addresses included in a records and cname records included in a dns response observed in a network, and each edge represents a correspondence relationship between one and another of the names and the ip addresses in the a records and the cname records, and to associate the generated graph information with a client corresponding to the dns response; and an identifying unit configured to identify a name related to a leaf node that is reachable from a node corresponding to the ip address of a server by tracing the edges in the graph information having been associated with the client, for a packet between the client and the server that is observed in the network.. . ... Nippon Telegraph And Telephone Corporation

02/15/18 / #20180048439

Wireless communication system and wireless communication method

A wireless communication system includes distributed units communicating with a terminal device and a central unit connected to the distributed units and receiving and processing signals from the distributed units. The central unit includes a host function unit to pre-notify the distributed units if a received signal from the terminal device is a target of coordination between distributed units, hard/soft determination units configured to separate received signals from the distributed units into a hard decision value and a soft decision value based on presence or absence of coordination between the distributed units, transmit the hard decision value to the host function unit as is, and transmit the soft decision value to a signal combining unit, the signal combining unit combines soft decision values output from the hard/soft determination units and outputs a combined soft decision value, and a decoding unit performs decoding using the soft decision value output from the signal combining unit.. ... Nippon Telegraph And Telephone Corporation

02/15/18 / #20180046800

Device for detecting malware infected terminal, system for detecting malware infected terminal, method for detecting malware infected terminal, and program for detecting malware infected terminal

A detection device generates an event sequence from events that are acquired for each of identifiers that distinguish among terminals in a monitoring target network or pieces of malware, by taking into account an order of occurrence of the events. The detection device retrieves events that commonly occur in event sequences belonging to a same cluster among clusters including event sequences with similarities at a predetermined level or higher, and extracts, as a detection event sequence, a representative event sequence based on a relationship between events that have high occurrence rates in similar common event sequences. ... Nippon Telegraph And Telephone Corporation

02/08/18 / #20180041535

Security measure invalidation prevention device, security measure invalidation prevention method, and security measure invalidation prevention program

A security measure invalidation prevention device includes an acquisition unit that acquires invalidated security point information about an invalidated security point among security points each having a measure function performing a security measure on a node connected to a network. The invalidated security point has a measure function to be invalidated. ... Nippon Telegraph And Telephone Corporation

02/08/18 / #20180041471

Control device, border router, control method, and control program

When an attack is detected, a controller samples an attack-target addressed dns reply, received by a border router, from each of the border routers. Then, the controller adds the transmission-source ip address of the sampled dns reply to the black list of the border router. ... Nippon Telegraph And Telephone Corporation

02/08/18 / #20180040330

Encoding method, decoding method, encoder apparatus, decoder apparatus, and recording medium for processing pitch periods corresponding to time series signals

In encoding, pitch periods for time series signals in a predetermined time interval are calculated, and a code corresponding thereto is output. In that encoding, the resolutions for expressing the pitch periods and/or a pitch period encoding mode are switched according to whether an index indicating a periodicity and/or stationarity level of the time series signals satisfies a condition indicating high or low in periodicity and/or stationarity. ... Nippon Telegraph And Telephone Corporation

02/08/18 / #20180040329

Encoding method, decoding method, encoder apparatus, decoder apparatus, and recording medium for processing pitch periods corresponding to time series signals

In encoding, pitch periods for time series signals in a predetermined time interval are calculated, and a code corresponding thereto is output. In that encoding, the resolutions for expressing the pitch periods and/or a pitch period encoding mode are switched according to whether an index indicating a periodicity and/or stationarity level of the time series signals satisfies a condition indicating high or low in periodicity and/or stationarity. ... Nippon Telegraph And Telephone Corporation

02/01/18 / #20180035467

Wireless communication system and wireless communication method

A wireless user equipment performing wireless communication in a primary and a secondary frequency bands, a first wireless access point ap performing the wireless communication in the primary frequency band, and a second wireless base transceiver station bts performing the wireless communication in the secondary frequency band are included. The ap and the bts are connected to each other through a network. ... Nippon Telegraph And Telephone Corporation

02/01/18 / #20180034766

Communication partner correspondence relationship collecting device, communication partner correspondence relationship collecting method, and communication partner correspondence relationship collecting program

A communication partner correspondence relationship collecting device includes a communication partner specifying unit that specifies a subject communication partner whose correspondence relationships are to be collected; a dns query transmission controller that controls a dns client such that the dns client transmits a dns query to the subject communication partner in a given cycle shorter than a cycle in which the ip address corresponding to the subject communication partner is changed and that collects ip addresses corresponding to the subject communication partner from responses to the dns queries; and a correspondence relationship log information creator that creates log information from the ip addresses corresponding to the subject communication partner, which are the ip addresses collected by the dns query transmission controller, and at least one of a set of dates and a set of times at which responses are made to the dns queries.. . ... Nippon Telegraph And Telephone Corporation

02/01/18 / #20180034555

Multi-stage interferometer circuit with waveform shaping function

A multi-stage interferometer circuit of the present invention includes: a multiplexing port; (n-1) stages of lattice type two-beam interferometers, wherein each stage includes a two-beam delay circuit having a path length difference of an integral multiple of m·Δ l/2, and wherein the two-beam delay circuit of the lattice type two-beam interferometer of the first stage is connected to the multiplexing port; an m-beam interferometer including: two sets of 1×(m/2) optical couplers connected to the first optical coupler of the lattice type two-beam interferometer at the final stage; an m-array delay circuit, each delay circuit of which has a delay length different from each other by Δl; and m×m optical couplers; and m demultiplexing ports, wherein one or more transversal filters are arranged inside the multi-stage interferometer circuit so that the light guided between the demultiplexing port and the multiplexing ports passes therethrough at least once.. . ... Nippon Telegraph And Telephone Corporation

01/25/18 / #20180027591

Wireless communication system, wireless communication method, wireless lan access point, and wireless lan station

A predetermined sta includes a station information collection unit collecting from the sta itself and other stas station information used for selection of stas performing simultaneous transmission and for control of the simultaneous transmission, and a simultaneous-transmission request unit knowing occurrence of a qos data frame based on the station information and transmitting a request frame requesting the simultaneous transmission to an ap. The ap includes a station information collection unit; a simultaneous-transmission determination unit selecting a combination of the stas performing the simultaneous transmission based on the station information by reception of the request frame; and a trigger transmission unit transmitting to each of the stas performing the simultaneous transmission a trigger frame instructing to performs the simultaneous transmission and including information necessary for controlling the simultaneous transmission. ... Nippon Telegraph And Telephone Corporation

01/25/18 / #20180027293

Quality-of-experience optimization system, quality-of-experience optimization apparatus, recommend request apparatus, quality-of-experience optimization method, recommend request method, and program

A quality-of-experience optimization system configured to optimize quality (qoe: quality of experience) that a user experiences in a content distribution service, including: a recommend request apparatus configured to output a distribution parameter candidate of content distribution for optimizing qoe of content distribution, and to receive a distribution parameter for optimizing the qoe as a recommend value; and a quality-of-experience optimization apparatus configured to estimate qoe from the distribution parameter candidate received from the recommend request apparatus, and to calculate a distribution parameter for optimizing the qoe as a recommend value to output the recommend value.. . ... Nippon Telegraph And Telephone Corporation

01/25/18 / #20180026862

Estimation device, estimation method, and recording medium

An estimation device measures a number of dns requests for each domain name and for each ip address in observed flows, measures a total number of the flows, and total amounts of data; estimates a relationship between the amount of data for each ip address corresponding to a node, and the number of dns requests for each domain name corresponding to a non-intermediate node; and based on a value obtained by multiplying the number of requests for each domain name by the amount of data for each flow of each domain name, obtains the amount of data for each flow of each domain name, and to multiply the amount of data by the number of the dns requests for each domain name, so as to calculate an estimate of the amount of data for each domain name.. . ... Nippon Telegraph And Telephone Corporation

01/25/18 / #20180026424

Electroabsorption modulator integrated distributed feedback laser with integrated semiconductor optical amplifier, and driving method for same

The present invention relates to a driving method for an soa integrated ea-dfb laser monolithically-integrating a dfb laser portion, an ea modulator portion and an soa portion, on a same substrate, wherein an electric current isoa is injected into the soa portion within a range of a power consumption not exceeding a total amount of a power consumption eliminated in the dfb laser portion of the soa integrated ea-dfb laser and a power consumption eliminated in the ea modulator portion of the soa integrated ea-dfb laser by eliminating an elimination amount Δidfb from a maximum injection electric current into a dfb laser portion of an ea-dfb laser allowable in a case of mounting the ea-dfb laser on an optical transmission module.. . ... Nippon Telegraph And Telephone Corporation

01/25/18 / #20180025670

Inconsistency detecting method, inconsistency detecting system, inconsistency detecting device, and program

An inconsistency in shares is detected with a small volume of communications traffic. N inconsistency detecting devices generate random numbers si and make the random numbers si public. ... Nippon Telegraph And Telephone Corporation

01/25/18 / #20180024250

Satellite signal reception characteristic estimation apparatus, method thereof, and program thereof

A satellite signal reception characteristic estimation apparatus includes a satellite orbital information collection unit that collects and outputs orbital information for a satellite; a peripheral environment spatial information collection unit that collects spatial information for a peripheral environment of an installation position of a satellite antenna; a positional information collection unit that collects and outputs positional information for the installation position of the satellite antenna; and a simulation server unit that estimates reception characteristics of satellite signals at the installation position of the satellite antenna by performing a simulation based on the orbital information, the spatial information, and the positional information outputted from the satellite orbital information collection unit, the peripheral environment spatial information collection unit, and the positional information collection unit.. . ... Nippon Telegraph And Telephone Corporation

01/18/18 / #20180020233

Moving image encoding device

A computation unit subtracts a prediction image from an input image. An orthogonal transformation unit applies orthogonal transformation to an output of the computation unit. ... Nippon Telegraph And Telephone Corporation

01/18/18 / #20180020014

Malicious communication pattern extraction device, malicious communication pattern extraction system, malicious communication pattern extraction method, and malicious communication pattern extraction program

A malicious communication pattern extraction device includes: a statistical value calculation unit that calculates a statistical value for an appearance frequency of each of plural communication patterns, from a traffic log obtained from traffic caused by malware, and a traffic log obtained from traffic in a predetermined communication environment; a malicious list candidate extraction unit that compares between the appearance frequency of the traffic logs for each of the communication patterns, based on the calculated statistical value, and extracts the communication pattern as the malicious communication pattern when a difference between both of the appearance frequencies is equal to or more than a predetermined threshold; and a threshold setting unit that sets a threshold so that an erroneous detection rate probability of erroneously detecting the traffic caused by malware and a detection rate probability of detecting the traffic caused by malware is equal to or more than a certain value.. . ... Nippon Telegraph And Telephone Corporation

01/18/18 / #20180020012

Malware analysis system, malware analysis method, and malware analysis program

A malware analysis system includes a preliminary analysis unit, a determination unit, and a designation unit. The preliminary analysis unit executes malware obtained as a candidate for an analyzing subject to obtain information related to communication transmitted from the malware. ... Nippon Telegraph And Telephone Corporation

01/11/18 / #20180011691

Random number generation apparatus, random number generation method and program

A random number acquiring unit 15 obtains a first sequence that comprises values of digits of a random number represented by a binary number as elements. A logical product arithmetic unit 16 obtains a third sequence that is results of elementwise logical product operation between the first sequence and a second sequence that comprises values of digits of one or more mersenne numbers represented by one or more binary numbers and a zero value as elements.. ... Nippon Telegraph And Telephone Corporation

01/04/18 / #20180006889

Highly reliable path accommodation design apparatus and method

Accommodation design for wavelength and sub-λ paths in a communication network is performed. If sub-λ path accommodation is possible according to search for a wavelength path present in a single-hop logical route, the accommodation in the wavelength path is executed. ... Nippon Telegraph And Telephone Corporation

12/28/17 / #20170374167

Communication speed estimation apparatus, communication speed estimation method, and program

A communication speed estimation apparatus configured: to generate communication log information representing history of communication executed by a user, and store the communication log information in a communication history information storage unit; to calculate, based on the stored communication log information, throughput result information for each of a server, a network, and a user terminal that were used for the communication for each time slot, and store the calculated throughput result information in a quality information storage unit; and, when the user performs new communication, in advance, to read out corresponding throughput result information from the quality information storage unit based on at least one of a terminal, a server, and a network that the user intends to use, and a time slot including a time when the user intends to perform communication, and to estimate a communication speed in the new communication based on the read-out throughput result information.. . ... Nippon Telegraph And Telephone Corporation

12/28/17 / #20170373841

Key exchange method, key exchange system, key device, terminal device, and program

A random number generating unit generates random numbers s1, s2, s′1, and s′2. A public keys randomizing unit generates first randomized public keys information obtained by randomizing public keys using the random number s1 and second randomized public keys information obtained by randomizing the public keys using the random number s2. ... Nippon Telegraph And Telephone Corporation

12/28/17 / #20170372086

Leakage prevention apparatus, leakage prevention method and program

An assumed use permission range storage stores a predetermined assumed use permission range. An unavailable state storage stores an information asset in an unavailable state by encryption. ... Nippon Telegraph And Telephone Corporation

12/21/17 / #20170366288

Framer and framing method

A framer in a transmission device that allocates time slots of an optical channel to a logical path, divides client signals received via the logical path to the time slots allocated to the logical path, and transmits the client signals by a plurality of optical suhcarriers using optical wavelengths correlated with the time slots includes: a time slot allocating unit configured to perform a process of reducing a transmission band of the logical path when some of the optical wavelengths are unavailable and changing the time slots allocated to the logical path depending on the reduced transmission band to avoid using the time slots corresponding to the unavailable optical wavelengths.. . ... Nippon Telegraph And Telephone Corporation

12/21/17 / #20170365192

Secret falsification detecting system, secret computation apparatus, secret falsification detecting method, and program

Falsification is detected during secret computation that uses a plurality of types of secret sharing. A secret computation apparatus 1 uses shared values [a0], . ... Nippon Telegraph And Telephone Corporation

12/14/17 / #20170359582

Video quality estimation device, video quality estimation method, and video quality estimation program

A video quality estimation apparatus used for an encoded video, to estimate a video quality value being a value quantifying a video quality being quality of the video felt by a user when viewing and listening to the video. The apparatus includes a maximum value calculator to calculate a maximum value of the video quality value from a resolution of the video and a frame rate of the video, and a video quality calculator to calculate an estimated video quality value corresponding to an encoding bit rate having been input, based on a predetermined relationship between the encoding bit rate of the video and the video quality value. ... Nippon Telegraph And Telephone Corporation

12/07/17 / #20170353296

Proxy computing system, computing apparatus, capability providing apparatus, proxy computing method, capability providing method, program, and recording medium

A computing apparatus outputs τ1 and τ2 corresponding to a ciphertext x, a capability providing apparatus uses τ1 to correctly compute f(τ1) with a probability greater than a certain probability and sets the result of the computation as z1, uses τ2 to correctly compute f(τ2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub′va′ if the computation results u and v satisfy a particular relation, where g and h are groups, f(x) is a function for obtaining an element of the group g for xεh, x1 and x2 are random variables having values in the group g, x1 is a realization of the random variable x1, and x2 is a realization of the random variable x2.. . ... Nippon Telegraph And Telephone Corporation

12/07/17 / #20170350984

Time synchronization device, and method and program therefor

A time synchronization method that is capable of selecting whether synchronization, by a timepiece unit that generates a time signal synchronized with a standard time and outputs it to an exterior, with the time is performed by time information obtained by receiving a radio wave including information relating to the time, or is performed by means of a holdover performed using a clock signal from an internal or external clock source. A schedule having a first time period in which the above-mentioned time information is used, and a second time period by means of the holdover is determined according to temporal reception characteristics of the radio wave at a reception location of the radio wave, and according to the schedule, supplying the timepiece unit with the time information or supplying the timepiece unit with the clock signal from the internal or external clock source.. ... Nippon Telegraph And Telephone Corporation

11/23/17 / #20170339183

Optimization apparatus, optimization method, and optimization program

An optimization apparatus collects cyber attack information that is information related to a cyber attack, and system information that is information related to an entire system including a device that has received the cyber attack. Based on the collected cyber attack information and system information, the optimization apparatus identifies an attack route of the cyber attack, and extracts, as dealing point candidates, devices that are on the attack route and have an effective dealing function against the cyber attack. ... Nippon Telegraph And Telephone Corporation

11/23/17 / #20170339171

Malware infected terminal detecting apparatus, malware infected terminal detecting method, and malware infected terminal detecting program

A detecting apparatus generates a collection of events, the collection being formed based on a predetermined condition, from events obtained for each identifier identifying a terminal in a monitoring target network or a piece of malware. The detecting apparatus then extracts, from a cluster formed of collections of events, the collections having a similarity therebetween equal to or larger than a certain similarity, events commonly appearing in the collections of events belonging to the same cluster, and extracts, according to a predetermined condition, the taken out events as a collection of detection purpose events. ... Nippon Telegraph And Telephone Corporation

11/23/17 / #20170336696

Optical modulator

The present invention provides an optical modulator including a substrate and a phase modulation portion on the substrate. The phase modulation portion includes an optical waveguide comprised of a first clad layer, a semiconductor layer that is laminated on the first clad layer and has a refraction index higher than the first clad layer and a second clad layer that is laminated on the semiconductor layer and has a refraction index lower than the semiconductor layer, a first traveling wave electrode, and a second traveling wave electrode. ... Nippon Telegraph And Telephone Corporation

11/16/17 / #20170329962

Identification device, identification method, and identification program

A command server identification device adds a tag to data received by malware upon execution of the malware, the tag capable of uniquely identifying identification information for a transmission source of the data, and tracks propagation of the data added with the tag. The command server identification device acquires a tag of data referenced by a branch instruction executed by the malware, among the tracked data. ... Nippon Telegraph And Telephone Corporation

11/09/17 / #20170324496

Optical transport system and resource optimization method

In the optical transport system a transport frame generator divides a transport frame accommodating plural client signals into plural transmission signals. Subcarrier transmission units convert the signals into optical signals using different optical carriers and transmit the converted optical signals. ... Nippon Telegraph And Telephone Corporation

11/09/17 / #20170324472

Framer and framing method

A framer in a transmission device allocates plural optical channel time slots to a plurality of logical prioritized paths. It allocates received client signals to the allocated time slots, and transmits the client signals by a plurality of optical subcarriers that use a plurality of optical wavelengths corresponding to the plurality of time slots. ... Nippon Telegraph And Telephone Corporation

10/26/17 / #20170310997

Image encoding method, image decoding method, image encoding apparatus, image decoding apparatus, image encoding program, and image decoding program

An image encoding/decoding apparatus for performing encoding/decoding while predicting an image between different views using a reference image for a view different from a processing target image and a reference depth map which is a depth map for an object of the reference image when a multi-view image including images of a plurality of different views is encoded/decoded includes a reference depth region setting unit configured to set a reference depth region which is a corresponding region on the reference depth map for decoding target regions into which the processing target image is divided, and an inter-view prediction unit configured to generate an inter-view predicted image for the processing target region from the reference image using depth information in the reference depth region as depth information for the processing target region.. . ... Nippon Telegraph And Telephone Corporation

10/26/17 / #20170310996

Image encoding method, image decoding method, image encoding apparatus, image decoding apparatus, image encoding program, and image decoding program

An image encoding/decoding apparatus for performing encoding/decoding while predicting an image between different views using a reference image for a view different from a processing target image and a reference depth map which is a depth map for an object of the reference image when a multi-view image including images of a plurality of different views is encoded/decoded includes a reference depth region setting unit configured to set a reference depth region which is a corresponding region on the reference depth map for decoding target regions into which the processing target image is divided, and an inter-view prediction unit configured to generate an inter-view predicted image for the processing target region from the reference image using depth information in the reference depth region as depth information for the processing target region.. . ... Nippon Telegraph And Telephone Corporation

10/26/17 / #20170310694

Malicious communication pattern extraction apparatus, malicious communication pattern extraction method, and malicious communication pattern extraction program

A malicious communication pattern extraction apparatus extracts communication patterns of traffic group of malwares, and replaces the values of predetermined field with variation in a traffic group with a wild card. Further, the malicious communication pattern extraction apparatus classifies pieces of malware having similar communication patterns in the traffic group into the same cluster, and for each cluster, extracts, as a malicious communication pattern, a communication pattern group having an appearance rate in a traffic group of respective pieces of malware in the cluster, the appearance rate being equal to or larger than a predetermined value. ... Nippon Telegraph And Telephone Corporation

10/26/17 / #20170310473

Secure computation system and relay device, and method, program, and recording medium thereof

A relay device transfers a plurality of original data fragments corresponding to a plurality of secret sharing values of original data to a plurality of secure computation devices, transfers, to each of the secure computation devices, a request to send a result fragment based on a secure computation result corresponding to any one of the original data fragments, and transfers the result fragment. The relay device controls timing with which the original data fragments are transferred and timing with which the request to send is transferred.. ... Nippon Telegraph And Telephone Corporation

10/26/17 / #20170308688

Analysis apparatus, analysis system, analysis method, and analysis program

An analysis apparatus analyzes access logs including authentication results and authentication information of users, and includes: a calculation unit that calculates a similarity between pieces of authentication information in two consecutive access logs when access logs of the same access source, from the access logs, are chronologically arranged, and presumes that a piece of authentication information of the access logs of the user has been input by a human if the calculated similarity is equal to or greater than a predetermined value; and a risk determination unit that determines that there is a possibility that the access source in the access logs is being an attack source if an authentication result of any of the two access logs is authentication failure and the calculation unit presumes that any piece of authentication information of the two access logs has not been input by a human.. . ... Nippon Telegraph And Telephone Corporation

10/12/17 / #20170293477

Analysis device, analysis method, and analysis program

A program analysis unit of a browser emulator manager exhaustively searches a code by performing syntax analysis of a code included in web content to search a transfer code to another site or a content acquisition code, and specifies at least any of an object and a function and a property of the object used in the code found as a result of the search. Further, the program analysis unit extracts a code having a dependence relationship with the transfer code or the content acquisition code based on at least any of the object and the function and the property of the object thus specified.. ... Nippon Telegraph And Telephone Corporation

10/05/17 / #20170287444

Display control device, display control method, and display control program

A display control device (10) detects change of a screen, and executes, depending on the detected change of the screen, any one or both of provisional update processing that generates a strip-shaped rectangular region extended in a vertical direction or a horizontal direction based on the position of an icon displayed on the screen, searches the screen for a region similar to a specified image template by using the rectangular region as a search range, and performs overlay display of an icon in the similar region, and definitive update processing that searches for a region similar to the image template by using a region larger than a search range of the provisional update processing as a search range, and performs overlay display of an icon at a position corresponding to the similar region.. . ... Nippon Telegraph And Telephone Corporation

10/05/17 / #20170286692

Vulnerability finding device, vulnerability finding method, and vulnerability finding program

A vulnerability finding device has a vulnerability extracting unit, a normalization processing unit, and a matching unit. The vulnerability extracting unit extracts a first program code corresponding to a vulnerable part of software. ... Nippon Telegraph And Telephone Corporation

10/05/17 / #20170281021

Heartbeat detection method and heartbeat detection device

A heartbeat detection device includes a difference value calculation unit (3) for calculating, from a sampling data sequence of an electrocardiographic waveform of a living body, one of an amount of change and a degree of change of sampling data for each sampling time, a multiplication unit (4) for calculating, for each sampling time, a product by multiplying one of an amount of change and a degree of change of the sampling data at a time k by one of the sampling data at the time k and sampling data at a time before the time k by a predetermined time t, a peak detection unit (5) for detecting a peak of the product, and a heartbeat time determination unit (6) for setting time of the peak of the product as a heartbeat time.. . ... Nippon Telegraph And Telephone Corporation

09/28/17 / #20170277579

Annotation apparatus, annotation method, and annotation program

An annotation apparatus includes an annotation db, a screen state acquisition monitor unit, and an external collaboration program call unit. The annotation db stores therein an annotation object and an annotation rule applicable to each of windows of the annotation object in an associated manner. ... Nippon Telegraph And Telephone Corporation

09/21/17 / #20170272167

Station-side apparatus in optical transmission system, optical transmission system, and optical transmission method

An olt (1) is formed by n optical transceivers (11), one pon control circuit (12), and one selection and distribution circuit (13). An optical transceiver selection control signal (sc) is transferred from the pon control circuit (12) to the selection and distribution circuit (13). ... Nippon Telegraph And Telephone Corporation

09/14/17 / #20170258351

Heartbeat detection method and heartbeat detection device

A heartbeat detection device includes a peak search unit (4) for searching for one of a peak at which a value m obtained from a sampling data sequence of an electrocardiographic waveform of a living body changes from an increase to a decrease and a peak at which the value m changes from a decrease to an increase, and a heartbeat time determination unit (5) for checking the value m in a predetermined time domain before a time of the peak and the value m in a predetermined time domain after the time of the peak, and setting the time of the peak as a heartbeat time if differences between the value m at the time of the peak and the values m in the predetermined time domains are not smaller than a predetermined amount.. . ... Nippon Telegraph And Telephone Corporation

09/07/17 / #20170257169

Framer, optical transmission device, and framing method

There is provided a tray which is connected to a plurality of transmitters that multicarrier-transmit a plurality of parallel signals by optical subcarriers. The framer selects time slots to be allocated to a path to be accommodated such that the number of optical subcarriers corresponding to the time slots satisfies a predetermined condition on the basis of empty time slots which are specified by path accommodation information indicating a correspondence between paths allocated to a client signal and time slots in a signal frame and the optical subcarriers corresponding to the empty time slots indicated by time slot information indicating a correspondence between the time slots and the optical subcarriers, and sets the selected time slot in the path accommodation information. ... Nippon Telegraph And Telephone Corporation

08/17/17 / #20170237232

Burst optical signal transmission device and burst optical signal transmission method

A burst optical signal transmission device which includes a light source for generating and outputting burst signal light, a light source driving circuit for outputting, to the light source, a driving signal for switching between an output time and a stop time of the burst signal light, based on a burst control signal, and a pre-emphasis circuit for outputting a pre-emphasis control signal for superimposing an additional signal for charging a capacitor included in the light source, onto the driving signal, at a timing in the vicinity of the beginning of the burst control signal.. . ... Nippon Telegraph And Telephone Corporation

08/10/17 / #20170228541

Browser emulator device, construction device, browser emulation method, browser emulation program, construction method, and construction program

A browser emulator is caused to emulate a client environment that is arbitrary values of types and versions of an os, a browser, and a plugin. Further, the browser emulator monitors execution of a script or a plugin. ... Nippon Telegraph And Telephone Corporation

08/10/17 / #20170228265

Log analysis apparatus, log analysis system, log analysis method and computer program

Techniques for extracting a set of highly correlated logs without user's prior knowledge of generation rules of logs generated by a machine. A log analysis apparatus includes: a template storage unit configured to store templates for log messages; a template determination unit configured to determine templates corresponding to log messages provided from a to-be-monitored host from the stored templates; an event candidate extraction unit configured to detect templates determined for log messages provided from the same host from the determined templates and extract a sequence of the detected templates as an event candidate; and an event extraction unit configured to extract a sequence of frequently occurring templates as an event from the extracted event candidate.. ... Nippon Telegraph And Telephone Corporation

08/10/17 / #20170224244

Biological signal measurement system, biological information measurement apparatus, and biological information extraction algorithm changing method

In a biological signal measurement system of this invention, biological digital data is generated from a biological signal measured by a biological signal measurement apparatus, and first feature amount data extracted from the biological digital data and downsized biological digital data are transmitted to a portable terminal. In a biological information measurement apparatus of this invention, biological feature amount data is extracted from measured biological waveform data, and at least one of the biological waveform data and the biological feature amount data is transmitted to an external device. ... Nippon Telegraph And Telephone Corporation

08/03/17 / #20170223040

Identifying device, identifying method and identifying program

An identifying device monitors malware to be analyzed and acquires, as log data, the malware, download data downloaded from a communication destination, and a relation of data transfer performed with the malware or the communication destination of the download data. Then, the identifying device creates, by using the acquired log data, a dependency relation graph that is a digraph in which the malware, download data, and communication destination are set as nodes and a dependency relation of each node is set as an edge. ... Nippon Telegraph And Telephone Corporation

07/27/17 / #20170215083

Wireless communication system, wireless communication method, cooperation control apparatus, terminal apparatus, and licensed band base station apparatus

A wireless communication system includes a plurality of terminal apparatuses that perform communication using a first frequency band in which communication based on a random access scheme is performed and a second frequency band which is different from the first frequency band, a first base station apparatus that performs communication using the first frequency band, a second base station apparatus that performs communication using the second frequency band, and a cooperation control apparatus that selects a terminal apparatus that transmits user data via the first base station apparatus from among the plurality of terminal apparatuses based on information acquired by the first base station apparatus and the second base station apparatus. The cooperation control apparatus selects which of the first base station apparatus and the selected terminal apparatus acquires access right for transmission of the user data via the first base station apparatus, and notifies the selected terminal apparatus and the first base station apparatus of the selection result.. ... Nippon Telegraph And Telephone Corporation

07/20/17 / #20170207875

Optical communication system, station-side device, subscriber device, and optical communication method

An optical communication system of the present invention switches a communication wavelength from a current communication wavelength to a auxiliary communication wavelength when an abnormality occurs in a communication wavelength between a station-side device and any one of a plurality of subscriber devices. Further, this optical communication system switches a communication wavelength used for communication between the subscriber device and the station-side device that perform communication using the auxiliary communication wavelength from the auxiliary communication wavelength back to the current communication wavelength when communication is recovered from an abnormality in the current communication wavelength.. ... Nippon Telegraph And Telephone Corporation

07/20/17 / #20170206356

Information processing system, controlling method, and controlling computer program

A virtual machine includes a shadow memory, a shadow disk, and a virtual nic. A virtual machine includes a guest os. ... Nippon Telegraph And Telephone Corporation

07/20/17 / #20170206355

Dynamically-loaded code analysis device, dynamically-loaded code analysis method, and dynamically-loaded code analysis program

A dynamically-loaded code analysis device includes a memory unit, an extraction unit, and a specification unit. The memory unit memorizes dynamically-loaded code information indicating a class structure of a dynamically-loaded code and call method information in which tag information added to user information is associated with a class structure of a code performed for the user information, for each of the dynamically-loaded codes acquired via a network. ... Nippon Telegraph And Telephone Corporation

07/13/17 / #20170199331

Optical fiber splicing structure

An optical fiber splicing structure of the invention includes: an optical fiber connector that is capable of holding an optical fiber at both sides thereof in a radial direction; a receiving optical fiber that is provided inside the optical fiber connector and has a hole opening at an end face of a connection end thereof; a solid refractive index matching layer that is formed at the end face of a connection end of the receiving optical fiber and enters the hole; and an external optical fiber that is to be butt-jointed to the receiving optical fiber by being butt-jointed to the receiving optical fiber at the end faces thereof with the refractive index matching layer interposed therebetween.. . ... Nippon Telegraph And Telephone Corporation

06/29/17 / #20170186255

Security system, management apparatus, permission apparatus, terminal apparatus, security method and program

At the time of setting authority, a management apparatus stores a database in which authority information corresponding to authority to physically drive a drive apparatus, which is a tangible object, using a terminal apparatus, and registration identification information corresponding to a subject that is given the authority are associated, and outputs information representing any of the registration identification information; and a permission apparatus receives and stores the information. At the time of exercising the authority, the terminal apparatus outputs information representing identification information, and the permission apparatus receives the information and, when the identification information corresponds to registration identification information comprised in setting information, outputs information representing authority exercise information required to exercise the authority. ... Nippon Telegraph And Telephone Corporation

06/29/17 / #20170185578

Information analysis system, information analysis method, and information analysis program

An information analysis system includes a remark analysis unit, a thread analysis unit, and a storing unit. The remark analysis unit analyzes importance of a remark included in a thread serving as a group of remarks posted on a network, based on remark data serving as data relating to the remark, for each of the remarks. ... Nippon Telegraph And Telephone Corporation

06/29/17 / #20170184803

Optical fiber ribbon and optical fiber cable housing optical fiber ribbon

Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in v-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. ... Nippon Telegraph And Telephone Corporation

06/22/17 / #20170180157

Base station apparatus, wireless communication system, and communication method

A base station apparatus is provided with at least one remote unit apparatus each including at least one antenna, and a central unit apparatus connected to each remote unit apparatus via a transmission path. The antenna provided in the remote unit apparatus receives a transmission signal wirelessly transmitted from at least one wireless terminal each including at least one antenna. ... Nippon Telegraph And Telephone Corporation

06/22/17 / #20170180078

Base station apparatus, wireless communication system, and communication method

A base station apparatus includes at least one remote unit apparatus including at least one antenna; and a central unit apparatus connected to each remote unit via a transmission path. The remote antenna receives a wireless transmission signal from at least one wireless terminal including at least one antenna. ... Nippon Telegraph And Telephone Corporation

06/22/17 / #20170178659

Coding method, device, program, and recording medium

A coding technology that efficiently codes an input sound signal irrespective of the characteristics thereof and can obtain a decoded sound signal that sounds less artificial to a listener. A coding method codes an input sound signal frame by frame of a predetermined time segment by a selected coding processing from a plurality of types of coding processing in the frequency domain, the coding method makes it possible for a selection unit to select coding processing which is different from the coding processing of the preceding frame as coding processing of the present frame if at least one of the magnitude of the energy of high frequency components of the input sound signal of the preceding frame and the magnitude of the energy of high frequency components of the input sound signal of the present frame is smaller than or equal to a predetermined threshold value.. ... Nippon Telegraph And Telephone Corporation

06/15/17 / #20170170923

Wdm/tdm-pon system and transmission start time correction method thereof

A transmission start time correction method of a wdm/tdm-pon system includes: a completion instruction procedure in which a station-side subscriber accommodation apparatus issues an instruction using a downstream signal for instructing a subscriber apparatus to perform wavelength switching, the downstream signal including a transmission start time of an upstream signal indicating completion of the wavelength switching of the subscriber apparatus, the upstream signal being transmitted by the subscriber apparatus after the wavelength switching; an instruction completion transmission procedure in which the subscriber apparatus transmits the upstream signal indicating the completion of the wavelength switching at a wavelength after switching at the instructed transmission start time after the wavelength switching is completed in accordance with the instruction; and a transmission start time correction procedure in which the station-side subscriber accommodation apparatus measures a reception time of the upstream signal indicating the completion of the wavelength switching received after the wavelength switching and sets a time obtained by adding a time twice a time difference between a reception time of the upstream signal indicating the completion of the wavelength switching assumed before the wavelength switching and a reception time of the upstream signal indicating the completion of the wavelength switching received after the wavelength switching to the transmission start time of the upstream signal before the wavelength switching as a new transmission start time.. . ... Nippon Telegraph And Telephone Corporation

06/08/17 / #20170160466

Multicore fiber and manufacturing method of multicore fiber

A multicore fiber includes a plurality of unit multicore fibers each including: a plurality of core portions; and a clad portion which is formed in an outer circumference of the core portions and has a refractive index lower than a maximum refractive index of the core portions. The plurality of the core portions have substantially same refractive index profile and different group delays at same wavelength in same propagation mode. ... Nippon Telegraph And Telephone Corporation

06/01/17 / #20170155669

Detection device, detection method, and detection program

An unauthorized-access detection device in which when a relationship between information regarding a request transmitted from a terminal operated by a user to a service server that provides a service, which is acquired by a request acquisition unit, and information regarding a query transmitted from the service server to a db that accumulates information regarding the service, which is acquired by a query acquisition unit, is different from a normal pattern, a detection unit detects the query as unauthorized access to the db.. . ... Nippon Telegraph And Telephone Corporation

05/18/17 / #20170139148

Method of manufacturing optical connector, optical connector, and optical fiber insertion device

A method of manufacturing an optical connector according to the invention includes: holding a first optical fiber by a pair of holding members at a position apart from an end face of a second end and through both sides thereof in a radial direction, the first optical fiber being provided with a solid refractive index-matching material layer, the refractive index-matching material layer being formed on the end face of the second end on an opposite side of an end face of a first end exposed to a front end of a ferrule; and inserting the first optical fiber into a fiber hole of the ferrule through the first end.. . ... Nippon Telegraph And Telephone Corporation

05/18/17 / #20170135889

Nurse call system, interface unit, and nurse call connection method

In nurse call systems where communication between a plurality of slave units and a plurality of extension terminals is possible, a nurse call controller serving the slave units and a private branch exchange serving the mobile terminals have been connected to each other through a nurse call adaptor; thus, there is a need for one such nurse call system that does not require a nurse call adaptor. Provided is an interface unit which is connected to a nurse call controller through a plurality of isnd basic interfaces, connected to a private branch exchange through an isdn primary rate interface, and performs interface conversion therebetween.. ... Nippon Telegraph And Telephone Corporation

05/04/17 / #20170127079

Video encoding device and video encoding method

Before completion of merge encoding processing of an immediately preceding pu, a controller determines the order of evaluation of merge candidates with the immediately preceding pu excluded from the merge candidates to be evaluated, and a merge-candidate derivation part evaluates each merge candidate in the order of evaluation. After the completion of the merge encoding processing of the immediately preceding pu, the controller re-determines the order of evaluation of merge candidates with the immediately preceding pu included in the merge candidates to be evaluated, and the merge-candidate derivation part evaluates each merge candidate in the re-determined order of evaluation excluding the merge candidate whose evaluation has already been started.. ... Nippon Telegraph And Telephone Corporation

05/04/17 / #20170126724

Log analyzing device, attack detecting device, attack detection method, and program

A device including: a parameter extracting unit that extracts each parameter from an access request, a character-string class converting unit that, with regard to each parameter, compares each part of a parameter value with a previously defined character string class, replaces the part with a longest matching character string class, and conducting conversion for a class sequence that is sequentially arranged in order of replacement, a profile storing unit that stores, as a profile in a storage unit, a class sequence with the appearance frequency of equal to or more than a predetermined value in the above-described group of class sequences with regard to the access request of the normal data as learning data, and a failure detecting unit that determines the presence or absence of an attack in accordance with the degree of similarity between the above-described class sequence and the profile with regard to the access request.. . ... Nippon Telegraph And Telephone Corporation

05/04/17 / #20170126715

Detection device, detection method, and detection program

A detection device includes a data-propagation tracking unit that gives communication data a tag including attribute information associated with communication destination information of the communication data and tracks propagation of communication data on which the tag including the attribute information is given, and a falsification detection unit that detects falsification on the communication data when, in the communication data, there is a tag including attribute information different from attribute information corresponding to a transmission destination or a transmission source of the communication data.. . ... Nippon Telegraph And Telephone Corporation

05/04/17 / #20170126714

Attack detection device, attack detection method, and attack detection program

An attack detection device including a packet collection unit that collects packets to be transmitted from a user terminal to a service providing server, a header-information acquisition unit that acquires header information from the packets, and an attack detection unit that determines whether each session is an attacking session by using the header information, wherein the attack detection unit compares a window size of a collected arbitrary packet and window sizes of other packets to one another for each of sessions, and when a comparison result satisfies a predetermined first condition, a corresponding session is detected as an attacking session.. . ... Nippon Telegraph And Telephone Corporation

05/04/17 / #20170123162

Optical fiber connector

An optical fiber splicer includes a fiber fixing portion, a first optical fiber fixed to the fiber fixing portion, a clamp portion which is capable of holding and fixing an extending portion extended from the fiber fixing portion of the first optical fiber and a tip portion of a second optical fiber optically connected to the extending portion of the first optical fiber between a base member and a pressing member being openable and closable with respect to the base member, and a solid index matching material which is attached to a tip surface of the extending portion of the first optical fiber and is interposed between the first optical fiber and the second optical fiber.. . ... Nippon Telegraph And Telephone Corporation

04/27/17 / #[object] in an optical fiber cable including a plurality of optical fiber units each formed by tying optical fibers in a bundle, preferable water resistance is to be achieved without increasing an outer diameter of the optical fiber cable.

Nippon Telegraph And Telephone Corporation

. . ... Nippon Telegraph And Telephone Corporation

04/27/17 / #20170115461

Optical fiber ribbon and optical fiber cable housing optical fiber ribbon

Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in v-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. ... Nippon Telegraph And Telephone Corporation

04/20/17 / #20170111165

Proxy computing system, computing apparatus, capability providing apparatus, proxy computing method, capability providing method, program, and recording medium

A computing apparatus outputs τ1 and τ2 corresponding to a ciphertext x, a capability providing apparatus uses τ1 to correctly compute f(τ1) with a probability greater than a certain probability and sets the result of the computation as z1, uses τ2 to correctly compute f(τ2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub′va′ if the computation results u and v satisfy a particular relation, where g and h are groups, f(x) is a function for obtaining an element of the group g for xεh, x1 and x2 are random variables having values in the group g, x1 is a realization of the random variable x1, and x2 is a realization of the random variable x2.. . ... Nippon Telegraph And Telephone Corporation

04/20/17 / #20170111116

Transport apparatus and transport method

A transport apparatus includes: a client signal transceiving unit which transceives a client signal; a line signal transceiving unit which performs electric-optic conversion on a line signal to be transmitted, transmits an optical line signal, performs optic-electric conversion on a received line signal, and outputs an electrical line signal; and a plurality of signal processing units which perform signal processing on the client signal to generate the line signal to be transmitted and perform signal processing on the electrical line signal to generate the client signal. Each of the plurality of signal processing units includes a signal transceiving unit which performs transfer of a branched signal obtained by branching a signal to be transmitted and a merged signal obtained by merging received signals with another signal processing unit, and the signal transceiving unit of each of the plurality of signal processing units and the signal transceiving unit of the other signal processing unit are coupled via an inter-chip wiring.. ... Nippon Telegraph And Telephone Corporation

04/20/17 / #20170108652

Method of splicing optical fiber and optical fiber splicing device

A method of splicing an optical fiber of the invention splices a first optical fiber cable and an optical fiber in a splicing box, the first optical fiber cable is a drop cable or an indoor cable, the optical fiber is drawn from a second optical fiber cable, the method splices a terminal of the first optical fiber cable and the optical fiber. The method includes: sliding a unit base holding an extended-optical-fiber-attached splice along a rail in a direction in which the unit base approaches a grasper; thereby inserting an inserted optical fiber grasped by the grasper between halved elements of a mechanical splice; and splicing the inserted optical fiber and an extended optical fiber by butt-jointing an end of the inserted optical fiber to the extended optical fiber.. ... Nippon Telegraph And Telephone Corporation

04/13/17 / #20170104583

Proxy computing system, computing apparatus, capability providing apparatus, proxy computing method, capability providing method, program, and recording medium

A computing apparatus outputs τ1 and τ2 corresponding to a ciphertext x, a capability providing apparatus uses τ1 to correctly compute f(τ1) with a probability greater than a certain probability and sets the result of the computation as z1, uses τ2 to correctly compute f(τ2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub′va′ if the computation results u and v satisfy a particular relation, where g and h are groups, f(x) is a function for obtaining an element of the group g for xεh, x1 and x2 are random variables having values in the group g, x1 is a realization of the random variable x1, and x2 is a realization of the random variable x2.. . ... Nippon Telegraph And Telephone Corporation

04/13/17 / #20170104582

Proxy computing system, computing apparatus, capability providing apparatus, proxy computing method, capability providing method, program, and recording medium

A computing apparatus outputs τ1 and τ2 corresponding to a ciphertext x, a capability providing apparatus uses τ1 to correctly compute f(τ1) with a probability greater than a certain probability and sets the result of the computation as z1, uses τ2 to correctly compute f(τ2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub′va′ if the computation results u and v satisfy a particular relation, where g and h are groups, f(x) is a function for obtaining an element of the group g for xεh, x1 and x2 are random variables having values in the group g, x1 is a realization of the random variable x1, and x2 is a realization of the random variable x2.. . ... Nippon Telegraph And Telephone Corporation

04/06/17 / #20170098074

Malware determination device, malware determination system, malware determination method, and program

A malware determination device, in which, upon input of an attribute name and an attribute value of an attribute of an executable file, a feature-selection setting unit registers the attribute with the attribute name in an attribute table as an attribute to be extracted, and registers the attribute value as an attribute value to be deleted in an attribute value table. Upon input of an executable file to be learned or to be determined, a feature extraction unit extracts an attribute value of an attribute registered as an attribute to be extracted in the attribute table from the executable file, to generate a feature vector including the extracted attribute value as a feature. ... Nippon Telegraph And Telephone Corporation

03/30/17 / #20170092283

Encoding method, encoder, program and recording medium

In an encoding method that is expected to produce a smaller code amount out of a periodicity-based encoding method and a non-periodicity-based encoding method, the amount of code or an estimated value of the amount of code of an integer value sequence is obtained while adjusting gain. In the other encoding method, an integer value sequence obtained in this process is substituted to obtain the amount of code or an estimated value of the amount of code of the integer value sequence. ... Nippon Telegraph And Telephone Corporation

03/09/17 / #20170070751

Image encoding apparatus and method, image decoding apparatus and method, and programs therefor

When multiview images are encoded, a first viewpoint-synthesized image for an encoding target region is generated by using a reference viewpoint image from a viewpoint other than that of the encoding target image and a reference depth map for the reference viewpoint image. A second viewpoint-synthesized image for reference pixels is generated by using the first viewpoint-synthesized image, where the reference pixels are a set of already-encoded pixels, which are referred to in intra prediction of the encoding target region. ... Nippon Telegraph And Telephone Corporation

03/09/17 / #20170070520

Website information extraction device, system, website information extraction method, and website information extraction program

A malicious url candidate extraction device extracts, from an access log including urls accessed from a managed network, a known malicious url excluded access log obtained by excluding an access log to known malicious urls. The malicious url candidate extraction device creates a minor url list obtained by preferentially extracting, from urls indicated in the known malicious url excluded access log, urls having a small number of times of access from the managed network. ... Nippon Telegraph And Telephone Corporation

03/09/17 / #20170070296

Optical signal transmission apparatus and optical signal transmission method

An optical signal transmission apparatus includes a modulation unit which modulates a transmission signal, a training signal sequence generation unit which generates a plurality of signal sequences having power concentrated in a plurality of different frequency bands, at least one of an amplitude and a phase of the plurality of signal sequences being modulated, as a training signal sequence, a signal multiplexing unit which appends the training signal sequence to the transmission signal, and an electro-optical conversion unit which converts a signal sequence obtained by appending the training signal sequence to the transmission signal into an optical signal and transmits the optical signal.. . ... Nippon Telegraph And Telephone Corporation

03/09/17 / #20170068048

Polarization rotator

Polarization rotators of conventional techniques require forming a silicon nitride layer, which is not employed in usual fabrication of a silicon waveguide circuit. In order to employ a polarization rotator function in an optical integrated circuit, a process of forming a silicon nitride layer is added just for that purpose. ... Nippon Telegraph And Telephone Corporation

02/23/17 / #20170053656

Coding device, decoding device, method, program and recording medium thereof

A coding method and a decoding method are provided which can use in combination a predictive coding and decoding method which is a coding and decoding method that can accurately express coefficients which are convertible into linear prediction coefficients with a small code amount and a coding and decoding method that can obtain correctly, by decoding, coefficients which are convertible into linear prediction coefficients of the present frame if a linear prediction coefficient code of the present frame is correctly input to a decoding device. A coding device includes: a predictive coding unit that obtains a first code by coding a differential vector formed of differentials between a vector of coefficients which are convertible into linear prediction coefficients of more than one order of the present frame and a prediction vector containing at least a predicted vector from a past frame, and obtains a quantization differential vector corresponding to the first code; and a non-predictive coding unit that generates a second code by coding a correction vector which is formed of differentials between the vector of the coefficients which are convertible into the linear prediction coefficients of more than one order of the present frame and the quantization differential vector or formed of some of elements of the differentials.. ... Nippon Telegraph And Telephone Corporation

02/16/17 / #20170048389

Nurse call system, nurse call conversion unit, nurse call connection method, and program

In nurse call systems that enable communication from a plurality of cordless handsets with a plurality of extension terminals carried by nurses belonging to a group, a nurse call conversion unit is provided between a nurse call control device and a private branch exchange. A call signal for a group representative call in which only an identification number for a group is given is transmitted by the nurse call conversion unit from the nurse call control device to the private branch exchange. ... Nippon Telegraph And Telephone Corporation

02/16/17 / #20170047075

Coding device, decoding device, method, program and recording medium thereof

A technology of accurately coding and decoding coefficients which are convertible into linear prediction coefficients even for a frame in which the spectrum variation is great while suppressing an increase in the code amount as a whole is provided. A coding device includes: a first coding unit that obtains a first code by coding coefficients which are convertible into linear prediction coefficients of more than one order; and a second coding unit that obtains a second code by coding at least quantization errors of the first coding unit if (a-1) an index q commensurate with how high the peak-to-valley height of a spectral envelope is, the spectral envelope corresponding to the coefficients which are convertible into the linear prediction coefficients of more than one order, is larger than or equal to a predetermined threshold value th1 and/or (b-1) an index q′ commensurate with how short the peak-to-valley height of the spectral envelope is, is smaller than or equal to a predetermined threshold value th1′.. ... Nippon Telegraph And Telephone Corporation

02/16/17 / #20170045813

Video presentation device, dynamic illusion presentation device, video generation device, method thereof, data structure, and program

A video is superimposed on an object in order that the object will be perceived as if the object were given a motion. This video is a video including a luminance motion component corresponding to a motion given to the object.. ... Nippon Telegraph And Telephone Corporation

02/09/17 / #20170040023

Encoder, decoder, coding method, decoding method, coding program, decoding program and recording medium

An encoder includes a periodic-combined-envelope generating part and a variable-length coding part. The periodic-combined-envelope generating part generates a periodic combined envelope sequence which is a frequency-domain sequence based on a spectral envelope sequence which is a frequency-domain sequence corresponding to a linear predictive coefficient code obtained from an input audio signal and on a frequency-domain period. ... Nippon Telegraph And Telephone Corporation

01/26/17 / #20170025132

Periodic-combined-envelope-sequence generation device, periodic-combined-envelope-sequence generation method, periodic-combined-envelope-sequence generation program and recording medium

An envelope sequence is provided that can improve approximation accuracy near peaks caused by the pitch period of an audio signal. A periodic-combined-envelope-sequence generation device according to the present invention takes, as an input audio signal, a time-domain audio digital signal in each frame, which is a predetermined time segment, and generates a periodic combined envelope sequence as an envelope sequence. ... Nippon Telegraph And Telephone Corporation

01/26/17 / #20170024658

Quantum computing device for ising model, quantum parallel computing device for ising model, and quantum computing method for ising model

A parametric oscillator oscillates a plurality of pseudo spin pulses spi having mutually an identical oscillation frequency by using parametric oscillation, an interaction implementing unit performs feedback implementation of a magnitude and a sign of interaction related to each pseudo spin pulse spi (the proportionality coefficient λi+Σjijσj+Σkijkσjσk with respect to σi) by using a tentative measurement result of oscillation phases φi(tentative) of the plurality of pseudo spin pulses spi, and a pseudo spin measuring unit measures the pseudo spins σi of the plurality of pseudo spin pulses spi, based on a final measurement result of oscillation phases φi(steady) of the plurality of pseudo spin pulses spi.. . ... Nippon Telegraph And Telephone Corporation

01/19/17 / #20170019683

Video encoding apparatus and method and video decoding apparatus and method

When one frame of multiview videos is encoded, each of encoding target regions obtained by dividing an encoding target image is encoded while motion information for a reference viewpoint image from a reference viewpoint other than a viewpoint of the encoding target image is used to perform prediction between different viewpoints. According to information, which indicates a corresponding region on the reference viewpoint image for the encoding target region, and the motion information for the reference viewpoint image, temporary motion information for the corresponding region is determined. ... Nippon Telegraph And Telephone Corporation

01/19/17 / #20170019418

Identifying apparatus, identifying method, and identifying program

A command and control server identifying apparatus provides data received by malware upon execution of the malware with a tag that allows to uniquely identify communication destination information of a source of the data, and tracks propagation of the data provided with the tag. Then, the command and control server identifying apparatus obtains a tag of data referred to by a branch instruction executed by the malware among tracked data. ... Nippon Telegraph And Telephone Corporation

01/12/17 / #20170013018

Analysis rule adjustment device, analysis rule adjustment system, analysis rule adjustment method, and analysis rule adjustment program

There is provided an analysis rule adjustment device that adjusts an analysis rule used in a communication log analysis performed to detect malicious communication through a network. The analysis rule adjustment device includes a log acquisition unit, a log analysis unit, and a first analysis unit. ... Nippon Telegraph And Telephone Corporation

01/12/17 / #20170010205

Flow cell and liquid feed system

A flow cell (2) includes a plate-shaped body 21 that is almost rectangular in a plan view, an introduction portion (22) that is made of a concave portion formed in the upper surface of the body (21), a channel (23) that is formed inside the body (21) and has one end connected to the lower end of the introduction portion (22), and a delivery portion (24) that is made of a concave portion formed in the body (21) and has the lower end connected to the other end of the channel (23). The introduction portion (22) is formed to cause the meniscus of a liquid introduced from an opening to apply, to the liquid, a positive pressure or a negative pressure whose absolute value is smaller than that of a negative pressure applied to the liquid introduced into the channel (23) by the meniscus of the liquid. ... Nippon Telegraph And Telephone Corporation








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