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Assignee: Nippon Telegraph and Telephone Corporation


Location: Tokyo, JP
No. of patents: 1571

1                      
NumberTitleIssue Date
8185961Network system, method for controlling access to storage device, management server, storage device, log-in control method, network boot system, and method of accessing individual storage unit
A network boot system including one or more client terminals, a DHCP (Dynamic Host Configuration Protocol) server, a PXE (Preboot Execution Environment) server, a TFTP (Trivial File Transfer Protocol) server, a database administration server (hereinafter, DB server)...
05/22/2012
8181487Optical fiber preform manufacturing method
An optical fiber preform manufacturing method includes: supporting a drilling jig in a radial direction of a preform that is cylinder-shaped; moving the drilling jig in a longitudinal direction of the preform; and forming a plurality of slits each extending in the l...
05/22/2012
8179995Reception device, transmission device, radio transmission/reception system, and radio reception method
Orthogonal converters perform orthogonal conversion on the N time-series data extracted from a received radio signal. Multi-user detectors extract transmitted signals from respective transmission devices, from the time-series data which has been subjected to the ort...
05/15/2012
8160870Method, apparatus, program, and recording medium for long-term prediction coding and long-term prediction decoding
A method and apparatus multiplies a past sample a time lag τ older than a current sample by a quantized multiplier ρ′ on a frame by frame basis, subtracts the multiplication result from the current sample, codes the subtraction result, and codes the time lag usi...
04/17/2012
8159307Logical element
In a logical element, supporting portions, and a beam supported by them at two ends are formed. The beam has a back side surface spaced apart from the top side surface of a substrate, creating a space between the facing surfaces of the beam and substrate. An excitat...
04/17/2012
8157454Releasable locking mechanism for optical connector
A receptacle (20) detachably accommodating a connector plug (34) connected to optical fibers (32) is rotatably supported by a shaft (14) provided in an installation table (10). The receptacle (20) is biased by a leaf spring ...
04/17/2012
8154602Video quality estimation apparatus, method, and program
In estimating subjective video quality corresponding to main parameters which are input as an input frame rate representing the number of frames per unit time, an input coding bit rate representing the number of coding bits per unit time, and an input packet loss ra...
04/10/2012
8150219Waveguide-type optical interferometer
In an optical interferometer, polarization dependence attributable to the optical path difference has conventionally been eliminated by inserting a half-wave plate at the center of the interferometer. However, light induced by polarization coupling produced in direc...
04/03/2012
8149978Clock/data recovery circuit
A clock/data recovery circuit includes a data duty correction circuit which outputs corrected data by correcting the duty of input data in accordance with the level of a correction signal, a clock recovery circuit which generates a recovered clock in synchronism wit...
04/03/2012
8149490Optical switch, optical switch control method and communication system
When a light intensity upon a perturbation is detected, an error calculation/correction unit (85) in a control unit (8) corrects and updates the above-described initial manipulated variables based on perturbation manipulated variables and manipulated v...
04/03/2012
8149489Mirror device, mirror array, optical switch, mirror device manufacturing method, and mirror substrate manufacturing method
A mirror device includes a mirror (153) which is supported to be pivotable with respect to a mirror substrate (151), a driving electrode (103-1-103-4) which is formed on an electrode substrate (101) facing the mirror ...
04/03/2012
8149419Optical reflectometry and optical reflectometer
An object of the invention is to provide an optical reflectometry and an optical reflectometer, in which accurate measurement can be performed irrespective of a measurement distance. In the optical reflectometry and optical reflectometer according to the invention, ...
04/03/2012
8148994Device and method for determining replacement of storage battery
A control unit (16) of a replacement determination device charges one or more battery modules (10) as determination targets, and measures the voltage change value of the battery module (10) in a predetermined period of time from the time of stop...
04/03/2012
8134920Device and method for correcting a path trouble in a communication network
In a disclosed backup path bandwidth keeping method for keeping bandwidth of a backup path to which an active path is switched when the active path becomes unavailable in nodes of a communication network, each node is connected to the same destination, and the metho...
03/13/2012
8130274Video quality objective assessment device, assessment method, and program
A video quality objective assessment device includes a temporal/spatial feature amount derivation unit (12) which derives a temporal/spatial feature amount (PC) which is the feature amount of deterioration which has occurred in a deteriorated video signal (PI...
03/06/2012
8126202Digital watermark padding method, digital watermark padding device, digital watermark detecting method, digital watermark detecting device, and program
A digital watermark embedding method of the present invention includes: a step of sequentially obtaining each frame image of the moving image data and frame display time; a step of generating a watermark pattern using watermark information, the frame display time an...
02/28/2012
8125701Optical switch
A detection means (52) detects optimum driving voltages of a mirror device. A correction means (53) corrects driving voltage values in a table (54b) based on the optimum driving voltages. This makes it possible to drive the mirror to an o...
02/28/2012
8121724Transfer system, and transfer method
In response to a transfer request, for which a loading time at a transfer source and a loading time at a transfer target are designated by a production controller, there is created a transfer scenario, which contains a basic transfer (From) from the transfer source ...
02/21/2012
8094692Modulation method, modulation program, recording medium, modulation device, and optical transmitter
A modulation method according to the invention is applied to a modulation device in which a light source is driven by a differential signal while a modulation circuit and the light source are capacitively coupled. In the modulation method of the invention, when an a...
01/10/2012
8094357Mirror control device
A mirror control device includes a pivotally supported mirror (230), electrodes (340a-340d) spaced apart from the mirror (230), a driving voltage generation means (401) for generating a driving voltage corresponding t...
01/10/2012
8094196Video matching device, method, and program
A matched state detection unit (33) of a video matching device (100) detects a reference video frame, of the respective video frames of a reference video (1) and degraded video (2B), which is in a matched state in which it is spatially an...
01/10/2012
8088644Bistable resistance value acquisition device, manufacturing method thereof, metal oxide thin film, and manufacturing method thereof
A ferroelectric layer (104) is sandwiched between a lower electrode layer (103) and an upper electrode (105). When a predetermined voltage (DC or pulse) is applied between the lower electrode layer (103) and the upper electrode (105
01/03/2012
8084003Ozone detecting device
A vessel (102) containing a detector solution (101) is prepared. The detector solution (101) is an aqueous solution prepared by dissolving a detector component containing a dye which changes its color when reacting with ozone gas, a humectant, a...
12/27/2011
8081881Optical node device, network control device, maintenance-staff device, optical network, and 3R relay implementation node decision method
An economical optical network is constituted by effectively using network resources by using the minimum number of, or minimum capacity of 3R repeaters. 3R section information corresponding to topology information on the optical network to which an optical node devi...
12/20/2011
8078113Adaptive antenna control method and adaptive antenna transmission/reception characteristic control method
An adaptive antenna control method is used for a radio communication system built by a plurality of radio base stations and a plurality of terminal stations capable of communicating with the radio base stations. Each radio base station includes an adaptive antenna h...
12/13/2011
8068042Coding method, decoding method, and apparatuses, programs and recording media therefor
An object of the present invention is to achieve high coding efficiency for a companded signal sequence and reduce the amount of codes. A coding method according to the present invention includes an analysis step and a signal sequence transformation step. The analys...
11/29/2011
8050334Signal encoder, signal decoder, signal encoding method, signal decoding method, program, recording medium and signal codec method
According to the present invention, a shift amount Sj−1 of the previous frame is held in a shift amount buffer of an integer signal coder. At least as many last sample values in the previous frame as the number of an order P used in linear predictive an...
11/01/2011
8037478Object state transfer method, object state transfer device, object state transfer program, and recording medium for the program
When the states of a large number of objects must be transferred to another device, the overhead can be greatly reduced and the object states can be synchronized in a short period of time. At the time of creating an object, an object creation function arranges the i...
10/11/2011
8036100Digital signal demultiplexing apparatus and digital signal multiplexing apparatus
A digital signal demultiplexing apparatus that can demultiplex and a digital signal multiplexing apparatus that can multiplex signals of channels having arbitrary frequency intervals and bandwidths are provided. The digital signal demultiplexing apparatus performs d...
10/11/2011
8032034Optical code communication system
An optical code communication system comprises an optical transmitter, an optical receiver, and an optical transmission line. The optical receiver has an optical mixing decoder for mixing a coded light and a local light, dividing the mixed light into an object optic...
10/04/2011
8031984Semiconductor optical modulator
The present invention can provide an npin-type optical modulator that has a high withstand voltage and is easily fabricated. A semiconductor optical amplifier (10) according to an embodiment of the present invention is an npin-type semiconductor optical modul...
10/04/2011
8030375Fiber-reinforced composite material and process for producing the same
Disclosed is a highly transparent fiber-reinforced composite material including an assembly of cellulose fibers of 4 to 200 nm average fiber diameter impregnated with a matrix material so as to not only remedy the moisture absorbency attributed to cellulose fibers b...
10/04/2011
8026047Resist pattern forming method, supercritical processing solution for lithography process, and antireflection film forming method
A fine and high-accuracy pattern, which is also excellent in either or both of high sensitivity and etching resistance can be provided. Disclosed is a resist pattern forming method in which a single- or multi-layered film 2 is formed on a substrate 1 a...
09/27/2011
8019468Transport system and transport method
A transport scenario composed of a basic transport (From) from a transport starting point to, e.g., a buffer near the transport destination point and a basic transport (To) from the buffer to the transport destination point is created in response to a transport requ...
09/13/2011
8018636Laminated holographic medium, recording apparatus/method, reproduction apparatus/method for the same and design method of laminated hologram medium
A medium 1, that is a laminated holographic medium of the present invention is composed of two or more core layers 2; 3 or more cladding layers 3 set so as to bind the core layers 2; one or more diffraction grating layers 4 storing...
09/13/2011
8014672Optical wavelength multiplexing access system
According to the present invention, a star-type wavelength multiplexed communication network using optical TX/RX devices capable of assigning the wavelengths can be provided without using the monitoring light. In an embodiment of the present invention, an optical TX...
09/06/2011
8014645Dispersion shifted optical fiber
A 1.55 μm band dispersion shifted optical fiber is provided which has a low loss and low dispersion slope. A core region “a” is heavily doped with GeO2 . A core region “b” is composed of pure SiO2 glass. A cladding section is arranged ...
09/06/2011
8014061Variable-focal length lens
To provide a variable-focal length lens capable of altering its focal length at high speed. The variable-focal length lens has an electrooptic material and electrodes formed on an incident surface of light and on an exit surface of the light of the electrooptic mate...
09/06/2011
8009994Optical node device, network control device, maintenance-staff device, optical network, and 3R relay implementation node decision method
An economical optical network is constituted by effectively using network resources by using the minimum number of, or minimum capacity of 3R repeaters. 3R section information corresponding to topology information on the optical network to which an optical node devi...
08/30/2011
8005374Optical transmission system, optical transmitter for optical transmission system, and optical receiver for optical transmission system
An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set. The optical receiver (2) has an infinitesimal-modulate...
08/23/2011
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