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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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.


Patent
NEC Platforms Ltd., Nippon Telegraph and Telephone | Date: 2017-04-26

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.


Patent
NTT Electronics, Nippon Telegraph and Telephone | Date: 2016-10-25

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.


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.


Patent
Nippon Telegraph and Telephone | Date: 2017-05-10

A cloud controller (50) performs, when an attack on a VM in any of data centers in a system is detected, setting of NAT of a private IP address of a VM(A), for a boundary router (30) of each data center (2, 3) other than a data center (1) that the VM(A) belongs to, the VM(A) being a victim. Next, the cloud controller (50) performs setting for a redirecting device (70) in the same data center (1) as the VM(A), such that the redirecting device (70) redirects access from a user terminal (10) to a host under a boundary router (30B, 30C) of any of the respective data centers (2, 3) other than the data center (1). Thereafter, the cloud controller (50) changes a private IP address of the VM(A) in a NAT setting of a boundary router (30A) of the data center (1) to a private IP address of the redirecting device (70).


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
NTT Electronics, Nippon Telegraph and Telephone | Date: 2017-05-03

Before completion of merge encoding processing of an immediately preceding PU, a controller (21) 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 (22) evaluates each merge candidate in the order of evaluation. After the completion of the merge encoding processing of the immediately preceding PU, the controller (21) 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 (22) evaluates each merge candidate in the re-determined order of evaluation excluding the merge candidate whose evaluation has already been started.


Patent
Fujikura Ltd, Nippon Telegraph and Telephone | Date: 2017-01-09

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. The connecting portions 3 are each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers 2, and both surfaces of the respective connecting portions 3 are each formed into a recess having a concave shape curved toward a center of the gap S to separate from lines 4,5 each connecting contact points of the optical fibers 2 when being placed on a horizontal surface.


A control apparatus performs analysis by using partial information and determines whether or not communication is abnormal. If the communication is determined to be abnormal, the control apparatus controls a communication route for a communication control device such that the communication is transmitted from a communication apparatus to the control apparatus. Further, the control apparatus determines whether or not the communication transmitted by the control of the communication route is malicious communication. As a result, if the communication is determined to be malicious communication, the control apparatus controls the communication control device to restrict the malicious communication.


Notomi M.,Nippon Telegraph and Telephone
Reports on Progress in Physics | Year: 2010

Recently, strongly modulated photonic crystals, fabricated by the state-of-the-art semiconductor nanofabrication process, have realized various novel optical properties. This paper describes the way in which they differ from other optical media, and clarifies what they can do. In particular, three important issues are considered: light confinement, frequency dispersion and spatial dispersion. First, I describe the latest status and impact of ultra-strong light confinement in a wavelength-cubic volume achieved in photonic crystals. Second, the extreme reduction in the speed of light is reported, which was achieved as a result of frequency dispersion management. Third, strange negative refraction in photonic crystals is introduced, which results from their unique spatial dispersion, and it is clarified how this leads to perfect imaging. The last two sections are devoted to applications of these novel properties. First, I report the fact that strong light confinement and huge light-matter interaction enhancement make strongly modulated photonic crystals promising for on-chip all-optical processing, and present several examples including all-optical switches/memories and optical logics. As a second application, it is shown that the strong light confinement and slow light in strongly modulated photonic crystals enable the adiabatic tuning of light, which leads to various novel ways of controlling light, such as adiabatic frequency conversion, efficient optomechanics systems, photon memories and photons pinning. © 2010 IOP Publishing Ltd.

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