Nec Corporation

Nippon Telegraph and Telephone Corporation

Gen Takahashi

Koki Hamada

Ryo Kikuchi

Dai Ikarashi

Tetsutaro Kobayashi

Hitoshi Fuji

Kaku Takeuchi

Satoshi Tanaka

Asami Miyajima

The encrypted data analysis device includes a sorting unit that sorts by [Time Information] and then sorts by [User ID] an encrypted data set group including a plurality of encrypted data sets, each of the plurality of encrypted data sets including a [Location ID], the [User ID], and the [Time Information], an encoding unit that generates a [Flow], and encoding the [Location ID] extracted, and an equal sign determination unit that determines whether a [User ID] and another [User ID] adjacent to each other are equal, and when not equal, replaces a corresponding [Flow] with a [predetermined value that represents invalid].

Encrypted data analysis device, encrypted data analysis method, and program

Provided is a technique for performing statistical processing such as processing for obtaining parameters of logistic regression analysis faster than before. A secure statistical processing system includes a cross tabulation table computing devicethat performs secure computation on a cross tabulation table in which frequencies are in plain texts while keeping each record concealed; and a statistical processing devicethat performs predetermined statistical processing using the cross tabulation table in which frequencies are in plain texts. The cross tabulation table computing devicemay include a plurality of secure computation devicesN that perform secure computation on a cross tabulation table in which frequencies are fragments subjected to secret sharing while keeping each record concealed, and a management devicethat restores the fragments to compute the cross tabulation table in which frequencies are in plain texts.

Secret statistical processing systems, methods, statistical processing apparatus and program

An access network node is provided with: a link switching part configured to be capable of exchanging data by switching between an active link and a standby link established with an adjacent node; a data identification part configured to identify type of data to be exchanged with an accommodated terminal; and a controller configured to select, from between the active link and the standby link, a link to be used in exchanging data with the accommodated terminal, based on the data type.

Access network node, radio communication system, communication method and program

The present invention ensures the reliability of measurement information about a cell measured by mobile terminals and enables the measurement information to be utilized for the optimization of a mobile communication network. An analysis device acquires measurement information about a reception signal state measured by a measuring instrument, acquires, together with terminal type information, measurement information about a reception signal state measured by mobile terminals, statistically processes the measurement information of the measuring instrument and the measurement information of the mobile terminals for each terminal type to generate respective typical data, groups similar pieces of the typical data of the measuring instrument and the typical data of the mobile terminals for each terminal type into the same group, and generates a measurement representative value distribution on the basis of the distribution of the typical data included in the same group and the distribution of terminal types in the group.

Network system, analysis device, method for processing measurement information, and recording medium

An environment risk analysis system includes: a probe terminal configured to acquire environment data including an atmosphere density; an environment analysis client configured to receive threshold data for analysis of an environment risk, specify an analysis-target area in geographic information, output the threshold data and data of the specified analysis-target area, receive an analysis result of the environment risk of the specified analysis-target area, and display data based on the analysis result in layers on the geographic information; and an environment analysis server configured to analyze the environment risk of the specified analysis-target area based on the environment data, the threshold data and the data of the specified analysis-target area, to output the analysis result. The environment analysis server calculates an estimation of a degree of an environmental influence based on the environment data, and calculates an estimation of an exposure rate of the environmental influence.

Environment risk analysis system and method of analyzing environment risk

A location-information discrimination method and device are provided that can accurately discriminate between locations of a mobile terminal in keeping with an actual environment. A discrimination value calculator calculates a discrimination value that is dependent on the amount of a change, from a predetermined value, in the received power of a radio signal received by a mobile terminal from a base station and on the duration of that change in the received power. The determination section compares the discrimination value with a predetermined value, thereby determining whether the mobile terminal is located indoors or outdoors.

Method and device for discriminating among locations of a mobile terminal

A calculation &#x3a0;e(R(i, 0), . . . , R(i, K&#x2212;1)) where a calculation of K elements R(i, k)&#x3b5;GF(p) of a finite field GF(p) over a finite field is expressed as e(R(i, 0), . . . , R(i, K&#x2212;1)) is efficiently performed. Polynomials poly(R(i, 0), . . . , R(i, K&#x2212;1)) that express a d-th-order extension field of the finite field GF(p), which are obtained by the calculations e(R(i, 0), . . . , R(i, K&#x2212;1)) for different values of i, are multiplied by each other, and a cumulative multiplication of the products is performed, for example. The polynomial poly(R(i, 0), . . . , R(i, K&#x2212;1)) is a mapping from the input elements of the finite field GF(p), and the coefficients of at least some of the terms thereof are 0. The same process is performed for different sets of values of i, and the calculation &#x3a0;e(R(i, 0), . . . , R(i, K&#x2212;1)) is performed using the result.

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Tokyo, Japan

Gen Takahashi