Nippon Telegraph and Telephone

www.ntt-global.com
Tokyo, Japan

The Nippon Telegraph and Telephone Corporation , commonly known as NTT, is a Japanese telecommunications company headquartered in Tokyo, Japan. Ranked 29th in Fortune Global 500, NTT is the largest telecommunications company in the world in terms of revenue.The company is incorporated pursuant to the NTT Law . The purpose of the company defined by the Law is to own all the shares issued by Nippon Telegraph and Telephone East Corporation and Nippon Telegraph and Telephone West Corporation and to ensure proper and stable provision of telecommunications services all over Japan including remote rural areas by these companies as well as to conduct research relating to the telecommunications technologies that will form the foundation for telecommunications.While NTT is listed on Tokyo, Osaka, New York, and London stock exchanges, the Japanese government still owns roughly one-third of NTT's shares, regulated by the NTT Law. Wikipedia.


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Patent
Nippon Telegraph and Telephone | Date: 2017-05-03

An object is to provide 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. There is provided a coding method that 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 that makes it possible for a selection unit 380 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.


A vulnerability finding device (10) has a vulnerability extracting unit (12), a normalization processing unit (14), and a matching unit (15). The vulnerability extracting unit (12) extracts a first program code corresponding to a vulnerable part of software. The normalization processing unit (14) performs normalization of a parameter included in the first program code extracted by the vulnerability extracting unit (12) and a second program code of software to be inspected for a vulnerable part. The matching unit (15) performs matching between the first program code after the normalization and the second program code after the normalization, and detects a program code, which is a program code that is the same as or similar to the first program code, from the second program code.


Patent
Fujikura Ltd, Nippon Telegraph and Telephone | Date: 2017-06-07

A method for batch fusion splicing of an optical fiber ribbon using a fusion machine (10), the method comprising: preparing the optical fiber ribbon (1) which includes: three or more of optical fibers (2) arranged in parallel and connecting portions (3) connecting adjacent two optical fibers (2) together, each of the optical fibers (2) having a bare glass optical fiber (6) covered by a cover layer (7, 8), the connecting portions (3) being intermittently provided in each of a ribbon longitudinal direction; removing the cover layers (7, 8) so as to obtain the bare glass optical fibers (6); and placing the respective bare glass optical fibers (6) on V-shaped grooves (9) in the fusion machine (10), wherein the V-shaped grooves (9) are arranged in parallel with a pitch of 250 m, each outer diameter dimension of the optical fibers (2) is set to smaller than or equal to 220 m, and each distance between centers of the adjacent two optical fibers (2) is set to 250 m with a margin of plus or minus 30 m by each of the connecting portions (3).


Patent
Furukawa Electric Group, Nippon Telegraph and Telephone | Date: 2017-02-23

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. The core portions of the multicore fiber are configured so that the core portions of the plurality of the unit multicore fibers are connected in cascade, a maximum value of differential group delays between the core portions of the multicore fiber is smaller than a reduced value of a maximum value of differential group delays between the core portions of each unit multicore fiber as a value in terms of a length of the multicore fiber.


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. It is possible to provide a biological signal measurement system capable of continuously measuring a biological signal for a long time without disturbing daily life and provide a biological information measurement apparatus capable of implementing downsizing and long life of a battery.


Patent
Nippon Telegraph and Telephone | Date: 2017-06-07

The estimation of an amount of chromatic dispersion using a training signal sequence is possible. A transmission method includes: a training signal sequence generation step of generating, as training signal sequences, a plurality of signal sequences having power concentrated in a plurality of frequency bands, the power concentrated at different frequency bands; a training signal sequence selection step of selecting at least one training signal sequence from among the plurality of training signal sequences generated in the training signal sequence generation step, a signal multiplexing step of generating a signal sequence obtained by time-division multiplexing the training signal sequence selected in the training signal sequence selection step with a transmission data sequence, and an electrical-to-optical conversion step of transmitting the signal sequence generated in the signal multiplexing step as an optical signal.


Patent
Nippon Telegraph and Telephone | Date: 2017-07-12

A program analysis unit (273) of a browser emulator manager (23) 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 (273) 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.


Patent
Nippon Telegraph and Telephone | Date: 2017-07-19

The purpose of the present invention is to realize a Web browser which can provide users with an equivalent quality of user experience even when accessed from devices with different processing performance. In this Web browsing system, Web browser function is divided between a browsing client unit and a browsing server unit, wherein the browsing client unit (91) notifies the browsing server unit (93) of the content of input to a user terminal and displays the Web page on the user terminal using information provided from the browsing server unit (93), and the browsing server unit (93), in accordance with the content inputted to the user terminal which was notified from the browsing client unit (91), provides the browsing client unit (91) with information necessary for displaying the Web page on the user terminal.


Patent
Furukawa Electric Group, Nippon Telegraph and Telephone | Date: 2017-07-26

A multicore fiber includes a plurality of unit multicore fibers 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 having substantially the same refractive index profile and different group delays at the same wavelength in the same propagation mode, wherein the core portions of the multicore fiber are configured so that the core portions of the plurality of the unit multicore fibers are connected in cascade, a maximum value of differential group delays between the core portions of the multicore fiber is smaller than a reduced value of a maximum value of differential group delays between the core portions of each unit multicore fiber as a value in terms of a length of the multicore fiber.


Patent
Nippon Telegraph and Telephone | Date: 2017-08-02

The identifying device (10) monitors malware (11) to be analyzed and acquires, as log data, the malware (11), download data downloaded from a communication destination, and a relation of data transfer performed with the malware (11) or the communication destination of the download data. Then, the identifying device (10) 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. Then, the identifying device (10) detects a malicious node by collating the respective nodes of the created dependency relation graph with the known maliciousness information, and traces an edge in a direction from a terminal point to a start point while setting the malicious node as a base point, and then identifies the traced node as a new malicious node.

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