Nec Corporation

Yahoo Japan Corporation

Lenovo Innovations Limited (Hong Kong)

Shuuji Yamaguchi

Junichiro Shibata

Naoki Furuhashi

Masakatsu Takizawa

Akira Sakai

Hidehito Gomi

Kota Tsubouchi

Yasuhei Shimada

Masayuki Terao

Makoto Kouno

Wataru Ogami

An authentication device management device includes a generating unit, a registration unit, a transmission unit, and a responding unit. The generating unit generates a pair of a first key to attach a signature with respect to an authentication result obtained by an authentication device that performs personal authentication of a user, and a second key to verify the signature attached to the first key. The registration unit registers, in association with each other, the key identifier that identifies the generated key pair and user identification information. The transmission unit transmits the first key generated by the generating unit to the authentication device used by the user. When the responding unit accepts a transmission request for the second key related to the authentication device in which the first key transmitted by the transmission unit has been set, the responding unit responds by instructing the authentication server to transmit the second key.

Authentication device management device, authentication device management method, non-transitory computer-readable recording medium, and authentication device management system

An authentication apparatus according to the present application includes an acquiring unit, a first specifying unit, a second specifying unit, and an authentication unit. The acquiring unit acquires context information on a target user who becomes a target for authentication. The first specifying unit specifies a belonging cluster based on information related to a plurality of cluster groups and the context information on the target user, in each of the plurality of the cluster groups. The second specifying unit specifies, for each belonging cluster based on a classification model used to specify a predetermined candidate user in the belonging cluster specified by the first specifying unit, a candidate user, in a partial candidate user group that belongs to the belonging cluster, who satisfies a predetermined condition. The authentication unit authenticates the target user based on information related to the candidate user specified by the second specifying unit.

Authentication apparatus and method for clustering and authenticating users

This portable terminal comprises a main unit having a microphone, a key operation unit, and a radio sending/receiving function of image and sound, a

Portable terminal with rotatable axial flip unit and dual lens arrangement

This portable terminal comprises a main unit having a microphone, a key operation unit, and a radio sending/receiving function of image and sound, a rotation axial unit having a video camera and an operation dial, an image display unit with a touch panel capable of displaying an image taken by the video camera, a received image and a screen for input operation, and a flip unit having the image display unit, a CCD camera, a speaker and an operation button. The rotation axial unit further includes an opening/shutting axis for connecting the main unit and the flip unit in a mutually rotatable way and a rotation axis for connecting the flip unit in a way of rotating the flip unit across the above rotation in the horizontal direction, and when the flip unit is opened and rotated across, it is used as a video camera with a monitor.

A communication device which can be freely inserted into and extracted from a slot of a terminal device has its part exposed from the terminal device when inserted into the slot applied a color according to a kind of the communication device and includes a radio unit adapted to a predetermined mobile communication service, applied a color according to a kind of the mobile communication service and storing information necessary for the connection to a specific provider.

Communication device, communication device set, authentication method and method of wireless-connecting terminals

To provide a piezoelectric transformer drive method and a drive circuit which is capable of preventing breakdown of the piezoelectric transformer due to excessive oscillation on its activation and of obtaining a high efficiency. Controller controlling the load power to a constant value is provided. The controller is controlled in such a manner that the driving of the piezoelectric transformer is initiated at a frequency higher than the resonating frequency on its activation and thereafter the drive frequency is gradually lowered without passing through the resonating frequency of the piezoelectric transfer on its activation.

Method and circuit for driving piezoelectric transformer

Disclosed is a power supply circuit for boosting drive voltage by a booster circuit, inputting the boosted voltage to the primary side of a piezoelectric transformer, and driving a load with an impedance of large temperature dependency by output voltage generated at the secondary side of the piezoelectric transformer. The circuit has: an excessively-small current detection means that outputs excessively-small current signal when load current flowing through the load is smaller than a predetermined value; a stopping means that stops the operation of the booster circuit when the excessively-small current signal is output; and a delaying means that sets a delay time according to the level of the output voltage. The stopping means determines the execution or inexecution of the operation according to the existence of the excessively-small current signal when the delay time passes.

Power supply circuit utilizing a piezoelectric transformer that supplies

A piezoelectric transformer driving circuit and method can prevent degradation of characteristics of a piezoelectric transformer. A repetition frequency of a drive voltage lower than a predetermined value, sweeping range narrower than a predetermined range and an output voltage of the piezoelectric transformer higher than a predetermined reference value are detected by a load current comparing circuit and an output voltage comparing circuit. In response to the results of the comparisons, a sweeping range varying means varies the repetition frequency to be higher than an upper limit value of the sweeping range in a frequency sweeping oscillator. By variation, the sweeping of the output voltage of the piezoelectric transformer is initiated from a small value to correct an effective value of a piezoelectric transformer vibration velocity to prevent degradation of characteristics of the piezoelectric transformer.

Piezoelectric transformer driving circuit and driving method

A drive circuit for a piezoelectric transformer includes a master block 24 having a drive frequency control circuit for controlling the frequency of a drive voltage for a piezoelectric transformer, at least one slave block 25 receiving an output of the above mentioned drive frequency control circuit and having a drive voltage control circuit for controlling a peak value of a drive voltage for a piezoelectric transformer, a circuit for PWM-modulating the drive voltages applied to the piezoelectric transformers, and driving the drive voltages in the same phase, and a circuit for suppressing a harmonic component of a light adjusting frequency included in the drive voltages for the piezoelectric transformers. With this arrangement, when a plurality of cold cathode tubes are driven by using piezoelectric transformer inverters, it is possible to eliminate the limit in the number of tubes lighted and the inclination of the brightness, and to prevent a flickering and the generation of an audible sound.

Growing community of inventors

Tokyo, Japan

Shuuji Yamaguchi