WO2011132534A1 - 統計情報生成システム及び統計情報生成方法 - Google Patents
統計情報生成システム及び統計情報生成方法 Download PDFInfo
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Definitions
- the present invention relates to a statistical information generation system and a statistical information generation method.
- the device described in Patent Document 1 uses a database that stores location information regarding each mobile terminal to tabulate the population distribution corresponding to the target area and target layer.
- the apparatus of patent document 2 is disclosing producing
- operation data such as mobile terminal location data and user attribute data, which is data for providing telecommunication services to mobile terminal users, is used.
- statistical processing such as tabulation to these operational data, it is possible to obtain estimated values related to demographics such as “number distribution”, “number of people moving”, and “number of people composition”.
- number of people distribution means the number of people distributed in each area
- number of people moving means the number of people moving between the areas
- number of people composition means the number of people and the number of people moving according to gender and age group.
- the tabulation result is not displayed or is represented as zero.
- a weighted sum multiplied by a different weight is obtained for each attribute of the contractor. The necessity of secrecy cannot be determined by comparing the sizes.
- the present invention has been made in view of such problems, and a statistical information generation system capable of concealing individual identifiability in statistical data when location data obtained from a mobile phone network is used. It is another object of the present invention to provide a statistical information generation method.
- the statistical information generation system of the present invention provides first identification information for identifying a mobile communication terminal, position information regarding the position of the mobile communication terminal, and time regarding the time when the position information is acquired.
- Attribute information storage data including first input means for inputting location information storage data including information, second identification information for identifying a mobile communication terminal, and attribute information relating to a contractor of the mobile communication terminal
- a second input means for inputting the search information a condition input means for inputting search condition information for the position information storage data and attribute information storage data, and a part of the position information storage data and attribute information storage data based on the search condition information
- the statistical object Corresponding to
- the first input means identifies the first identification information for identifying the mobile communication terminal, the position information regarding the position of the mobile communication terminal, and the time when the position information was acquired.
- a first input step of inputting location information storage data including time information, second identification information by which the second input means identifies the mobile communication terminal, and attributes relating to the contractor of the mobile communication terminal A second input step for inputting attribute information storage data including information, a condition input unit for inputting search condition information for the position information storage data and the attribute information storage data, and an extraction unit for searching Based on the condition information, the extraction step for extracting a part of the position information storage data and the attribute information storage data, and the enlargement coefficient assigning means include the attribute information storage data extracted by the extraction means.
- an extraction coefficient is extracted by the extraction means, and an expansion coefficient provision step for assigning an expansion coefficient that is a coefficient corresponding to the attribute information included in the attribute information accumulation data and indicates the degree of expansion to the numerical value of the statistical target Position information storage data, attribute information storage data having second identification information corresponding to the first identification information extracted by the extraction means and included in the position information storage data, and attached to the attribute information storage data
- a determination step for determining the size of the number of data by comparing the number of data aggregated by the aggregation means with a predetermined value; Output the statistical data when it is determined that the number of data is large, and when the determination means determines that the number of data is small, an output step of concealing and outputting the numerical value included in the statistical data; .
- demographic data is calculated from the position information accumulation data and the attribute information accumulation data, taking into account the degree of expansion to the numerical value of the statistical object, based on the search condition. Is done.
- the estimated statistical data is not information generated from a “small group”, and the statistical data is concealed according to the determination result.
- the Judgment whether or not it was generated from a “small group” cannot be made solely from the number of statistics in the statistical data. This is because the statistical number is derived by an expansion estimation based on the contract rate of different mobile terminals for each attribute. Therefore, by using the total number of data, it is possible to accurately determine whether or not the total data is generated from “a small number of groups”.
- FIG. 1 is a schematic configuration diagram of a statistical information generation system according to a preferred embodiment of the present invention. It is a figure which shows the data structure of the positional infomation storage data input into the 1st input part of FIG. It is a figure which shows the data structure of the attribute information storage data input into the 2nd input part of FIG. It is a flowchart which shows operation
- FIG. 1 is a schematic configuration diagram of a statistical information generation system 1 according to a preferred embodiment of the present invention.
- the statistical information generation system 1 shown in FIG. 1 uses a positional information that is data for providing a telecommunication service to mobile communication terminals such as a plurality of mobile terminals 2 in a mobile communication network NW, and estimates the demographics.
- the statistical information generation system 1 includes a plurality of information processing apparatuses including a non-identified information generation apparatus 11, a totalization apparatus 21, and an information concealment apparatus 31, and passes through the radio base station 3 and the mobile communication network NW.
- the statistical information generation system 1 may be configured by one information processing apparatus or may be configured by an arbitrary number of information processing apparatuses.
- the mobile terminal 2 has a function of acquiring its own location information using various positioning calculation methods such as positioning using GPS and positioning using radio waves from the radio base station 3. Further, the position information of the portable terminal 2 obtained as a result of the positioning calculation can be transmitted to the statistical information generation system 1 from the communication device connected to the portable terminal 2 or the mobile communication network NW.
- the non-identifying information generation apparatus 11 includes a first input unit (first input unit) 12, a second input unit (second input unit) 13, a key management unit (key management unit) 14, and a one-way calculation.
- the first input unit 12 receives position information from the outside such as the mobile communication network NW and stores it in the position information storage data.
- the location information accumulation data includes first identification information “090-XXXX-XXX” that is information for identifying the portable terminal 2 such as a line number, and latitude / longitude information or a location registration signal of the portable terminal 2.
- the first input unit 12 outputs the accumulated position information accumulation data to the non-identified position data generation unit 16.
- the key management unit 14 holds predetermined electronic key information. It is desirable that the electronic key information is strictly managed so as not to leak outside the key management means.
- the one-way operation unit 15 receives the first identification information and the second identification information from the non-identified position data generation unit 16 and the non-identification attribute data generation unit 17, respectively, and stores the electronic information held by the key management unit 14. By using the key information and applying a one-way function to the first identification information and the second identification information, the first non-identification information and the second non-identification information are output, respectively.
- the one-way calculation unit 15 uses a hash function such as SHA (Secure Hash Algorithm) -256 ⁇ ⁇ as a one-way function, and uses the hash value for the connection between the first identification information or the second identification information and the key information.
- the first non-identifying information or the second non-identifying information is output by arithmetic processing such as outputting.
- the non-identified position data generation unit 16 deletes the first identification information from the position information accumulation data, and inputs the first identification information created by inputting the first identification information to the one-way calculation unit 15. By adding to the position information accumulation data, non-identified position information accumulation data is generated. Here, it is also preferable that the non-discriminated position data generation unit 16 adds further data processing processing such as adding appropriate noise to the position information and hanging the position. Further, the non-identified position data generation unit 16 delivers the generated non-identified position information accumulation data to the counting device 21.
- the non-identifying attribute data generation unit 17 deletes the second identification information from the attribute information accumulation data, and inputs the second identification information generated by inputting the second identification information to the one-way calculation unit 15. By adding to attribute information storage data, non-identified attribute information storage data is generated.
- the non-identifying attribute data generation unit 17 generates abstract attribute information by abstracting the attribute information, and performs processing for replacing the attribute information with the abstract attribute information. Examples of such abstraction processing include processing such as rounding “age” to “age group”, deleting detailed portions of an address, and removing personally identifiable information such as names.
- the non-identifying attribute data generation unit 17 delivers the generated non-identifying attribute information accumulation data to the counting device 21.
- the aggregation device 21 of the statistical information generation system 1 includes a storage unit 22, a condition input unit (condition input unit) 23, an extraction unit (extraction unit) 24, an expansion coefficient provision unit (enlargement coefficient provision unit) 25, and a statistics. Part (statistical means) 26 and a totaling part (counting means) 27.
- the storage unit 22 stores non-identified position information accumulation data and non-identification attribute information accumulation data generated by the non-identification information generation device 11.
- the extraction unit 24 determines that the unidentified position information accumulation data with respect to the non-identification position information accumulation data when the matching rate for the search condition is obtained as a probability value. You may give the probability information which shows a probability value. For example, when it is probabilistically given whether “location information ⁇ A area”, the probability can be assigned to the extracted set.
- the expansion coefficient giving unit 25 acquires a numerical expansion coefficient according to a predetermined procedure based on the attribute information included in the non-identified attribute information storage data combined with the non-identified position information storage data, The enlargement factor is assigned to the combined data set.
- This expansion coefficient is a coefficient indicating the degree of expansion of the statistical target population value.
- the statistical unit 26 uses the data set obtained by combining the non-identified position information accumulation data and the non-identified attribute information accumulation data extracted by the extraction unit 24 and the expansion coefficient assigned by the expansion coefficient assignment unit 25 to calculate the population. Calculate statistical data on the estimate. Specifically, for each piece of information included in the data set, the statistical unit 26 extracts the age and gender from the attribute information, and calls the expansion coefficient adding unit 25 to obtain a corresponding expansion coefficient. Further, the statistical unit 26 calculates the sum of the expansion coefficients of all data records (data elements) included in the data set as the estimated number of persons. Here, if the probability information indicating the probability value corresponding to the search condition is added to some data records included in the data set, the statistical unit 26 multiplies the probability information by the expansion coefficient. The statistical number of people can be calculated by taking the sum of the values obtained. In addition, the statistical unit 26 outputs the calculated statistical data to the information concealment device 31.
- the totaling unit 27 totals the number of data in the data records (data elements) of the data set extracted by the extracting unit 24, and outputs the total value to the information concealment device 31 as the total number of persons.
- the enlargement factor and the probability information are not considered in the calculation of the total number of people.
- the information concealment device 31 should determine whether or not the statistical data needs to be concealed based on “how many pieces of information are estimated from the group of users of the mobile terminals 2”. This is because a pure number of data elements before the weighting process using probability information is required.
- the information concealment device 31 of the statistical information generation system 1 includes a determination unit (determination unit) 32 and an output unit (output unit) 33.
- the determination unit 32 determines the size of the number of data by comparing the number of data aggregated by the aggregation unit 27 with a predetermined value. For example, when “10” is given in advance as a specific reference value, the determination unit 32 determines whether or not the number of people counted by the counting unit 27 is “10” or more. The determination unit 32 determines that the total number of persons is large when the determination result is 10 or more, and determines that the total number of persons is small when the determination result is less than 10. Then, the determination unit 32 passes the determination result to the output unit 33.
- the output unit 33 determines whether or not to output the statistical data including the estimated number of persons estimated by the counting device 21 based on the determination result of the determination unit 32, and outputs the final statistical data.
- This statistical data may be output to an output device such as a display device provided directly in the statistical information generation system 1 or to a remote device such as the portable terminal 2 via a communication network such as a mobile communication network NW. It may be output.
- the output unit 33 outputs the estimated number of persons included in the statistical data as it is.
- the output unit 33 conceals the estimated number of persons by outputting the estimated number of persons by replacing the estimated number with a predetermined numerical value or sign.
- the estimated number of people is output as “0”, or “x”, which is a code indicating that the number is concealed, is output with the estimated number of people. Even if it is determined that there are a large number of people, considering the possibility of disclosure of residual values, round the estimated number of people to an approximate value with a certain numerical interval, or add a random number to the estimated value. It is also preferable to output as
- FIG. 4 is a flowchart showing an operation at the time of statistical information generation by the statistical information generation system 1.
- the non-identifying information generating device 11 receives the input of the position information and stores it in the position information storage data (step S101).
- the non-identified position data generation unit 16 of the non-identification information generation apparatus 11 is obtained by deleting the first identification information from the position information accumulation data and inputting it to the one-way calculation unit 15.
- the first non-identifying information is added to the position information accumulation data to generate non-identification position information accumulation data and store it in the storage unit 22 of the totalization device 21 (step S102).
- the non-identifying information generating apparatus 11 receives the attribute information and stores it in the attribute information storage data (step S103).
- the non-identification attribute data generation unit 17 of the non-identification information generation device 11 is obtained by deleting the second identification information from the attribute information accumulation data and inputting it to the one-way calculation unit 15.
- the non-identifying attribute information storage data is generated and stored in the storage unit 22 of the tabulation device 21 (step S104).
- the extraction unit 24 extracts from the storage unit 22 a set of non-identified position information accumulation data and non-identification attribute information accumulation data corresponding to the accepted search condition (step S106).
- the statistical unit 26 extracts a part of the attribute information, for example, age and sex, from the constituent elements of the data set extracted by the extracting unit 24 and gives them to the enlargement coefficient assigning unit 25, thereby providing each constituent element.
- An enlargement factor for is acquired (step S108).
- the statistical unit 26 calculates the sum of the enlargement factors and obtains the estimated number of people (step S109).
- the totaling unit 27 calculates the number of elements of the data set extracted by the extracting unit 24 and acquires it as the total number of persons (step S110).
- the extraction unit 24 has obtained a data set including four data elements each including the following data items “position, time, age, and sex”.
- Element 1 (A, t, 23, male)
- Element 2 (A, t, 33, male)
- Element 3 (A, t, 31, male)
- Element 4 (A, t, 85, male)
- the estimated number of people estimated by the statistical unit 26 is “26.5”, and the total number of people calculated by the totaling unit 27 is “4”.
- the determination unit 32 of the information concealment device 31 determines whether or not the total number of persons calculated by the totalization unit 27 is equal to or greater than a predetermined value (step S111). Assuming that “10” is given as a specific reference value, in the above example, since the total number of people is “4”, it is determined that the total number of people is small.
- the output unit 33 determines whether or not to output the estimated number of people as it is based on the determination in the determination unit 32, and outputs the final estimated value. That is, when it is determined that the total number of persons is large (step S111; YES), the output unit 33 outputs the estimated number of persons as an estimated value as it is (step S112). On the other hand, if it is determined that the total number of persons is small (step S111; NO), the estimated number of persons is concealed and output by replacing the estimated number of persons with a predetermined numerical value or sign (step S113). In the above example, since it is determined that the total number of persons is small, the estimated value is output as “0”, for example.
- the first and second identification information are respectively obtained from the position information accumulation data and the attribute information accumulation data associated with each other by the first and second identification information. Is removed, and first and second non-discriminating information is added.
- the first and second non-identifying information is obtained by substituting the electronic key information held in advance and the first and second identification information into a one-way function.
- the identification information cannot be calculated backwards. Also, even if the one-way function is known, as long as the value of the electronic key is kept secret, the correspondence between the identification information and the non-identification information even if the identification information is input to the one-way function brute force I can't know the relationship.
- demographic data that considers the degree of expansion to the numerical value of the statistical object is calculated from the non-identified position information storage data and the non-identified attribute information storage data to which the non-identification information is added. Is done.
- the identification information is replaced with non-identification information, it is possible to prevent the execution of statistical processing to disclose the behavior of a specific individual by giving a search condition using the identification information. Can do.
- the estimated statistical data is not information generated from a “small group”, and the statistical data is concealed according to the determination result.
- the Judgment whether or not it was generated from a “small group” cannot be made solely from the number of statistics in the statistical data. This is because the statistical number is derived by an expansion estimation based on the contract rate of different mobile terminals for each attribute. Therefore, by using the total number of data, it is possible to accurately determine whether or not the total data is generated from “a small number of groups”.
- the attribute information included in the attribute information accumulation data is replaced with the abstract attribute information obtained by abstracting the information, and the abstract attribute information and the search condition information are collated to thereby perform non-identification A part of the attribute information storage data is extracted. Therefore, it is possible to obtain an overview of demographics by obtaining statistical data in units of abstracted attribute information. Moreover, by identifying the statistical data, it is possible to make it more difficult to identify an individual based on the statistical data.
- probability information is given to the non-identified position information accumulation data, and statistical data is calculated by multiplying the probability information by an expansion factor, so that the match rate between the position information and the search condition is obtained as a probability. If it is, statistical data reflecting the probability can be obtained, and statistical data reflecting the entire demographic trend can be obtained. For example, when the position information is obtained as a probability distribution in the area, statistical data reflecting the probability distribution can be obtained.
- the position information accumulation data and the attribute information accumulation data processed by the statistical information generation system 1 include a line number as the first and second identification information, and the statistical information generation system 1 carries the line number as a mobile phone. It was processed as information for identifying the terminal 2.
- the statistical information generation system 1 uses, as information for identifying the mobile terminal 2 instead of the line number, a number for identifying the user of the mobile terminal 2 such as IMSI (International Mobile Subscriber Identity) or IMEI (International Mobile A number for identifying the device of the portable terminal 2 such as (Equipment Identity) may be processed.
- the extraction unit 24 of the totalization device 21 extracts a part of the data set corresponding to the search condition from the non-identified position information accumulation data and the non-identification attribute information accumulation data stored in the storage unit 22. It was. This is because the extraction unit 24 adds the probability information to the combined data set after combining the non-identified position information storage data and the non-identified attribute information storage data by a join operation, and searches among the data sets. You may make it extract the one part data set applicable to conditions. In addition, a data set before the probability information is added may be extracted, or a data set to which the expansion coefficient is added by the expansion coefficient adding unit 25 may be extracted.
- the statistics unit 26 of the totalization device 21 calculates the sum of the expansion factors of the data records included in the data set extracted by the extraction unit 24, but the sum of the data records included in the data set is calculated for each attribute. May be calculated by multiplying the sum by an expansion coefficient corresponding to the corresponding attribute. For example, first, the total number or sum of probability values of data records that match the attribute “30's male” included in the data set is calculated, and the expansion coefficient “2.0” corresponding to the attribute “30's male” is calculated for the total or total. By multiplying ", the number of statistical persons corresponding to the attribute can be calculated.
- the output unit 33 of the information concealment device 31 outputs the total number of statistics corresponding to the search condition based on the search condition accepted by the condition input unit 23 of the tabulation device 21.
- the extraction unit 24 generates data (hereinafter simply referred to as “position data”) generated by the portable terminal 2 by the extraction unit 24 in the following procedure.
- the feature quantity w ij which is information corresponding to the estimated generation density of the position information, is given, and the number of in-zones may be estimated by aggregating this set of position data by the statistical unit 26.
- the “estimated generation density” means an estimated value of the number of signals generated per unit time around the generation time of the position information by the terminal that generated the position information.
- each terminal a i is position information (for example, a position registration signal. The signal is observable.
- the signals transmitted by the terminal a i from the sector S during the observation period If x i is the total number of signals transmitted by the terminal a i in the sector S during the observation period, the estimation of the number of terminals is based on the observed signal q ij (j is an integer from 1 to x i ). It is none other than estimating the value of m.
- p i be the density at which the signal q ij is transmitted from the terminal a i (ie, the number of signals per unit time).
- the probability that the signal is transmitted is independent of the sector
- the expected value E (t i) the following expression for the residence time t i of the sector S in the observation period of the terminal a i (2) is satisfied.
- the signal q i (j + 1) related to the position data (second position data) immediately before the first position data is the same identification information as the first position data.
- the transmission time u i of the signal of the second position data q i (j-1) transmission time u i of (j-1) and the signal q i of the third position data (j + 1) ( The difference of j + 1) , that is, (u i (j + 1) ⁇ u i (j ⁇ 1) ) in the above equation (3) is set as the feature quantity w ij for the first position data. Therefore, the above formula (3) is as follows.
- the feature amount w ij can be calculated in association with the reciprocal of the density p ij .
- the extraction unit 24 of the counting device 21 adds the feature value w ij to all the position data to be counted.
- the estimated value E (m) of the number m of terminals can be calculated by the following equation (6).
- the terminal a i transmits the signals q i1 , q i2 , and q i3 within the observation period and the period in which the terminal a i stays in the sector S, and the signal q i1 .
- the signal q i0 is transmitted immediately before the signal q i3
- the signal q i4 is transmitted immediately after the signal q i3
- the transmission times of the signals q i0 , q i1 , q i2 , q i3 , q i4 are set to u i0 , u i1 , u, respectively.
- the above idea is that the stay time t i of the sector S in the observation period of the terminal a i is determined from (the midpoint of u i0 and u i1 ) (from u i3 and u i4 This is equivalent to estimating the period until the midpoint.
- the statistical unit 26 of the totalization device 21 specifies the feature amount w ij added to all the position data included in the data set, and calculates the sum of the feature amounts w ij as 2 of the observation period length T.
- the numerical value obtained by dividing by the multiplication is estimated as the number of terminals for each sector S and for each attribute.
- the statistical unit 26 calculates the estimated number of terminals for each sector S and for each attribute by multiplying the estimated number of terminals by the expansion coefficient.
- the statistical unit 26 divides each feature quantity w ij for the observation target position data by 2 to obtain the sum of (feature quantity w ij / 2).
- a numerical value obtained by dividing the sum by the observation period length T may be estimated as the number of terminals.
- the number of divisions can be overwhelmingly smaller. There is an advantage that the load can be reduced.
- the statistical unit 26 obtains the sum of the feature values w ij multiplied by the expansion coefficient for each attribute, and divides the obtained sum by twice the observation period length T.
- the obtained numerical value may be estimated as the number of estimated terminals for each sector S and for each attribute.
- the statistical unit 26 may calculate the statistical data by converting (area conversion) the estimated number of terminals for each sector S into a population estimation for each other area division such as a mesh.
- the area conversion method for example, when the estimated number of persons such as the estimated number of terminals is calculated for each sector S, the distribution ratio for a plurality of area sections such as meshes and municipalities is previously managed for each sector. Then, the statistical unit 26 divides the estimated number of people for each mesh into a plurality of area divisions according to the distribution ratio, and adds the estimated number of people divided for each area division for each area division. It can be converted into the estimated number of people.
- the totaling device 21 uses the following procedure as a target for position data that combines position information and attribute information, and represents the number of unique terminals that have stayed in the observation area in at least part of the observation period. You may estimate "the number of intruders" and “the number of intruders” that is a unique number of people who stayed in the observation area in at least part of the observation period.
- the position information included in the position data of the mobile terminal is given the sector number of the sector where the mobile terminal is located.
- the observation period information a set of the observation start time t 0 and the observation end time t 1 is acquired in advance by the condition input unit 23, and the sector number S is acquired in advance by the condition input unit 23 as the observation area information. Shall be.
- the extraction unit 24 is estimated to have stayed in the observation area in at least a part of the observation period, or the terminal within the observation period or an extended period described later
- One position data generated inside is extracted.
- Various methods can be adopted as the extraction method here. In the following, a method using the estimated stay period of each terminal in the observation area will be described as an example.
- the extraction unit 24 determines the position in the area when the acquisition time is within an extended period to be described later and the position information is arranged in chronological order in the order of the acquisition time. Based on the out-of-area position data adjacent to the data and indicating that the position information is outside the observation area, an estimated stay period during which the terminal stayed in the observation area is calculated for each terminal (step S1 in FIG. 7).
- the above-mentioned “expansion period” is, as an example here, a period obtained by extending the observation period by a predetermined time width (for example, 1 hour) before and after, that is, a time traced back by a predetermined time from the observation start time t 0.
- a start point and means a period in which a time advanced from the observation end time t 1 to the future by a predetermined time is the end point.
- a series of position data related to the same terminal acquired within the extended period is arranged in time series in the order of acquisition time, the position information in the area indicating the observation area is indicated by a black circle, and the position data in the area the at adjacent position information area outside position data indicating the outside observation area open circles, and acquisition time t a of the earliest area position data case, when the series is shown respectively, outermost destination area position data the time t in the corresponding to the proportional division point between the acquisition time t x of the area outside the location data adjacent (midpoint as an example) to the start time of the estimated stay in.
- the proportional division point between the acquisition time t y of the area outside the location data adjacent to area position data of said last is the end time of the estimated stay period. Accordingly, a period indicated by a rectangle in FIG. 8, that is, a period from time t in to time t out is calculated as the estimated stay period of the terminal.
- FIG. 9 is a diagram in which a series of position data regarding the terminals A to E acquired within the expansion period are arranged in the horizontal axis direction in time series in order of acquisition time for each terminal.
- In-area position data whose information indicates the inside of the observation area is indicated by a black circle
- out-of-area position data whose position information indicates the outside of the observation area is indicated by a white circle. If attention is paid only to in-area position data whose acquisition time is within the observation period (time t 0 to time t 1 ), three terminals C to E are extracted as corresponding terminals.
- step S2 terminals A to E are included. Are extracted. As a result, it is estimated that the terminals A and B that are excluded when focusing only on the in-area position data indicated by the black circles are staying in the observation area somewhere during the observation period.
- the method using the estimated stay period in steps S1 and S2 described above is an example, and other methods may be adopted. Other methods will be described later.
- the statistical unit 26 counts the number of terminals extracted in steps S1 and S2, and estimates the obtained count as the number of incoming terminals in the observation area within the observation period (step S3 in FIG. 7). .
- the expansion coefficient giving unit 25 derives an expansion coefficient for converting the number of incoming terminals into the incoming number for each extracted terminal based on the corresponding attribute information (step S4 in FIG. 7).
- the expansion coefficient adding unit 25 extracts the start time of the period in which the estimated stay period and the observation period overlap, and corresponds to the obtained start time It is preferable to derive an expansion coefficient to be used.
- the statistical unit 26 aggregates the expansion factors for each position data for each terminal derived by the expansion factor assigning unit 25, and the total of the obtained expansion factors is the number of entering the observation area within the observation period. (Step S5 in FIG. 7). And the statistics part 26 outputs the number of insertion obtained by estimation to the information concealment apparatus 31 (step S6 of FIG. 7). At this time, the number of incoming terminals obtained in step S3 may also be output.
- the expansion coefficient giving unit 25 gives the reciprocal of the contract rate corresponding to the attribute information as the expansion coefficient, but it may give an expansion coefficient reflecting the coverage ratio of the terminal.
- the expansion coefficient granting unit 25 is a ratio of “the number of contracted terminals of a specific communication carrier from which position data is obtained” in the “population in an area within a predetermined range” as an expansion coefficient reflecting the coverage ratio.
- the reciprocal of “terminal contract rate” can be used.
- the “number of contracted terminals of a specific communication carrier from which position data is obtained” can be aggregated from the position data stored in the storage unit 22.
- Such an expansion coefficient can be calculated for each address category, each age group, each gender, and each time zone.
- the concealment process by the information concealment device 31 may be executed as follows.
- the information concealment device 31 When the information concealment device 31 receives an estimated value (estimated population, etc.) from the statistical unit 26, for example, the information concealment device 31 performs the concealment process shown in FIG. That is, the determination unit 32 determines in advance that the number of acquisition source terminals indicating how many pieces of position data for each area (cell) that is the basis of the estimation is acquired from the confidential processing is determined. It is determined whether it is less than the reference value (10 as an example) (step S61 in FIG. 10).
- the number of acquisition source terminals indicates the number of unique terminals excluding duplication of the same terminal. In order to make the determination here, the number of acquisition source terminals of the position data for each area (cell) is required.
- the counting unit 27 uses the feature amount associated with the position data by the statistical unit 26. Are counted, the number of identification information in the position data (for example, the hashed telephone number after the non-identification processing by the non-identification position data generation unit 16 described above) is counted, and the obtained hashed
- the information on the total number of telephone numbers may be passed to the determination unit 32, and the determination unit 32 may use the total number of hashed telephone numbers as the number of acquisition source terminals for each area (cell).
- the determination unit 32 obtains the position data acquisition terminal for each area division that is aggregated by the aggregation unit 27. Determine the number. For example, when a certain area division Q extends over the sector SA and the sector SB, six units of terminal identification numbers: ID1, ID2, ID3, ID4, ID5, ID6 are included in the sector SA during the observation period to be counted. In the sector SB, location registration signals from five mobile terminals 2 having terminal identification numbers: ID4, ID5, ID6, ID7, and ID8 are observed.
- the determination by the determination unit 32 is not the sum of the number of acquisition source terminals for each sector SA and SB, but the number of terminals whose position data is the basis of the estimation for the area classification Q. This is performed using the number of acquisition source terminals of the area classification Q indicating whether or not it has been acquired from.
- the number of unique terminals in sector SA is 6 and the number of unique terminals in sector SB is 5.
- the number of acquisition source terminals to be determined by determination unit 32 is the number of acquisition source terminals calculated for area classification Q. : 8. If the reference value is 10 units, the number of acquisition source terminals is less than the reference value, and therefore the determination unit 32 sets the estimated value of the area classification Q as a target to be concealed.
- step S61 if the number of acquisition source terminals of the position data for each area (cell) that is the basis of the estimation is less than the reference value, the output unit 33 sets the estimated value for the area (cell) to zero.
- the estimated value is concealed (step S62).
- the concealment method here is not limited to setting the estimated value to zero, and other methods such as a method of representing the estimated value with a predetermined character or symbol (for example, “X”) are adopted. May be.
- step S63 Such a probabilistic rounding of the class width used in the estimated value output is performed (step S63). That is, assuming that the estimated value for a certain area (cell) is x and the class width is k, the output unit 33 determines that the estimated value x is a probability (if kn ⁇ x ⁇ k (n + 1) (n is an integer)). Round to k (n + 1) with x ⁇ kn) / k and to kn with probability (k (n + 1) ⁇ x) / k.
- the class width in the probabilistic rounding may be set as a class width by extracting the position data having the maximum expansion coefficient from the position data used for aggregation and multiplying the expansion coefficient by a predetermined value (for example, 10 times). . Further, the class width may be determined in advance, and stochastic rounding may be performed. At this time, a processing rule may be adopted in which data of an area (cell) including position data whose enlargement coefficient exceeds a predetermined ratio (for example, 1/10) of a predetermined class width is discarded.
- a predetermined value for example, 10 times
- the concealment process by the information concealment apparatus 31 is not limited to the process shown in FIG. 10, and another process may be adopted.
- step S61 of FIG. 10 instead of “the number of location data acquisition source terminals for each area (cell) on which the estimation is based”, the “number of position data for each area (cell) on which the estimation is based” "Is less than the reference value, or it may be determined whether the" estimated value to be output (population or number of terminals) "is less than the reference value.
- the process of step S63 may be omitted.
- key management means for holding predetermined electronic key information, first identification information and second identification information are input, and first identification information and second identification information are input.
- a one-way operation means for applying the one-way function using the electronic key information held by the key management means to output the first non-identifying information and the second non-identifying information;
- the first identification information is deleted from the information accumulation data, and the position information accumulation is performed by adding the first non-identification information output by the one-way calculating means to the position information accumulation data as the first identification information.
- de-identified attribute data generating means for generating attribute information storing data by adding the second identification information may further include a.
- the first and second non-identifications are performed after the first and second identification information are removed from the position information accumulation data and the attribute information accumulation data that are associated with each other by the first and second identification information, respectively.
- Information is given.
- the first and second non-identifying information is obtained by substituting the electronic key information held in advance and the first and second identification information into a one-way function. The identification information cannot be calculated backwards.
- the correspondence between the identification information and the non-discriminating information even if the identification information is input to the one-way function brute force I can't know the relationship.
- the identification information is replaced with non-identification information, it is possible to prevent the execution of statistical processing to disclose the behavior of a specific individual by giving a search condition using the identification information. it can.
- the non-identifying attribute data generation unit replaces the attribute information included in the attribute information accumulation data with the abstracted attribute information obtained by abstracting the information, and the extracting unit searches the abstracted attribute information and the abstracted attribute information. It is preferable to extract a part of the non-identifying attribute information accumulation data by collating the condition information. In this way, it is possible to obtain an outline of demographics by obtaining statistical data based on the abstracted attribute information, and to make it more difficult to identify individuals based on the statistical data.
- the extraction means gives probability information indicating a matching rate with the search condition information to the position information accumulation data, and the statistical means multiplies the probability information given to the position information accumulation data by an expansion coefficient. It is also preferable to calculate the statistical data.
- the extraction means estimates a value corresponding to the estimated generation density related to the position information generated by the mobile communication terminal based on the position information accumulation data, and assigns it as a feature amount, and the statistical means calculates the position information accumulation data It is also preferable to calculate the statistical data by multiplying the staying time information given to by an expansion coefficient. By adopting such a configuration, it is possible to estimate the stay time existing in the sector, obtain statistical data reflecting the stay time, and obtain statistical data reflecting the overall demographic trend.
- the present invention uses a position information counting device and a position information counting method, and can calculate a highly accurate population distribution with little error even when a positioning method that causes various errors is used. is there.
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Abstract
Description
要素1: (A, t, 23, 男性)
要素2: (A, t, 33, 男性)
要素3: (A, t, 31, 男性)
要素4: (A, t, 85, 男性)
(20 代,男性): 40% (=0.4)
(30 代,男性): 50% (=0.5)
(80 代,男性): 5% (=0.05)
要素1: (A, t, 23, 男性): 2.5
要素2: (A, t, 33, 男性): 2.0
要素3: (A, t, 31, 男性): 2.0
要素4: (A, t, 85, 男性): 20.0
即ち、各端末aiの観測期間内のセクタSの滞在時間tiの総和を観測期間の長さTで除した結果を、端末数mとして推計する。ただし、端末aiの観測期間内のセクタSの滞在時間tiの真の値は観測不能であるが、各端末aiは位置情報(例えば位置登録信号であり、以下では単に「信号」と言う。)を発信し、それらの信号は観測可能である。
(xiは、端末aiが観測期間内にセクタSで発信した信号の総数)とすると、端末数の推計とは、観測された信号qij(jは1以上xi以下の整数)からmの値を推計することに他ならない。
E(ti)=xi/pi (2)
ここで、信号qijの送信時刻をuijとしたとき、信号qijの密度pijは、以下の式(3)で与えられる。
pij=2/(ui(j+1)-ui(j-1)) (3)
ここで、信号qijを、特徴量wijを求める対象の位置データ(第1の位置データ)に係る信号とすると、信号qi(j-1)は、当該第1の位置データと同一の識別情報を含む位置データのうち、当該第1の位置データの直前の位置データ(第2の位置データ)に係る信号、信号qi(j+1)は、当該第1の位置データと同一の識別情報を含む位置データのうち、当該第1の位置データの直後の位置データ(第3の位置データ)に係る信号に相当する。本実施形態では、第2の位置データに係る信号qi(j-1)の送信時刻ui(j-1)と第3の位置データに係る信号qi(j+1)の送信時刻ui(j+1)の差、即ち、上記式(3)の(ui(j+1)-ui(j-1))を、第1の位置データについての特徴量wijとする。そのため、上記式(3)は、以下となる。即ち、特徴量wijは、密度pijの逆数に対応付けて算出することができる。
pij=2/(ui(j+1)-ui(j-1))=2/wij (4)
集計装置21の抽出部24は、集計対象の全ての位置データに対して特徴量wijを付加する。
Claims (9)
- 移動通信端末を識別する第1の識別情報と、該移動通信端末の位置に関する位置情報と、該位置情報が取得された時刻に関する時刻情報と、を含む位置情報蓄積データを入力する第1の入力手段と、
移動通信端末を識別する第2の識別情報と、該移動通信端末の契約者に関する属性情報と、を含む属性情報蓄積データを入力する第2の入力手段と、
前記位置情報蓄積データ及び前記属性情報蓄積データに対する検索条件情報を入力する条件入力手段と、
前記検索条件情報を基に、前記位置情報蓄積データ及び前記属性情報蓄積データの一部を抽出する抽出手段と、
前記抽出手段によって抽出された前記属性情報蓄積データに対して、前記属性情報蓄積データに含まれる属性情報に対応する係数であって、統計対象の数値への拡大度を示す拡大係数を付与する拡大係数付与手段と、
前記抽出手段によって抽出された前記位置情報蓄積データと、前記抽出手段によって抽出され、前記位置情報蓄積データに含まれる前記第1の識別情報に対応する前記第2の識別情報を有する前記属性情報蓄積データと、該属性情報蓄積データに付与された前記拡大係数と、を用いて、人口に関する統計データを算出して出力する統計手段と、
前記抽出手段によって抽出された前記位置情報蓄積データのデータ数を集計する集計手段と、
前記集計手段によって集計された前記データ数を所定値と比較することによって前記データ数の大小を判定する判定手段と、
前記判定手段によって前記データ数が大きいと判定された場合には、前記統計データを出力し、前記判定手段によって前記データ数が小さいと判定された場合には、前記統計データに含まれる数値を隠蔽して出力する出力手段と、
を備えることを特徴とする統計情報生成システム。 - 前記集計手段は、前記抽出手段によって抽出された位置情報蓄積データ中のユニークな前記第1の識別情報の個数を前記データ数として集計する、
ことを特徴とする請求項1記載の統計情報生成システム。 - 前記集計手段は、前記統計手段による集計単位であるエリア区分毎のユニークな前記第1の識別情報の個数を前記データ数として集計する、
ことを特徴とする請求項2記載の統計情報生成システム。 - 予め定められた電子鍵情報を保持する鍵管理手段と、
前記第1の識別情報及び前記第2の識別情報が入力されて、前記第1の識別情報及び前記第2の識別情報それぞれに対して、前記鍵管理手段が保持する前記電子鍵情報を用いた一方向関数を適用して、第1の非識別化情報及び第2の非識別化情報を出力する一方向演算手段と、
前記位置情報蓄積データから前記第1の識別情報を削除するとともに、前記位置情報蓄積データに対して、前記一方向演算手段によって出力された前記第1の非識別化情報を前記第1の識別情報として付加して位置情報蓄積データを生成する非識別化位置データ生成手段と、
前記属性情報蓄積データから前記第2の識別情報を削除するとともに、前記属性情報蓄積データに対して、前記一方向演算手段によって出力された前記第2の非識別化情報を前記第2の識別情報として付加して属性情報蓄積データを生成する非識別化属性データ生成手段と、
をさらに備えることを特徴とする請求項1~3のいずれか1項に記載の統計情報生成システム。 - 前記非識別化属性データ生成手段は、前記属性情報蓄積データに含まれる属性情報を、情報を抽象化した抽象化属性情報に置換し、
前記抽出手段は、当該抽象化された抽象化属性情報と前記検索条件情報を照合することにより、前記非識別化属性情報蓄積データの一部を抽出する、
ことを特徴とする請求項4記載の統計情報生成システム。 - 前記抽出手段は、前記位置情報蓄積データに対して、検索条件情報との一致率を示す確率情報を付与し、
前記統計手段は、前記位置情報蓄積データに付与された前記確率情報に対して前記拡大係数を乗じることによって前記統計データを算出する、
ことを特徴とする請求項1~5のいずれか1項に記載の統計情報生成システム。 - 前記抽出手段は、前記位置情報蓄積データを基にして、前記移動通信端末によって生成された前記位置情報に関する推定生成密度に対応する値を推計して特徴量として付与し、
前記統計手段は、前記位置情報蓄積データに付与された前記特徴量に対して前記拡大係数を乗じることによって前記統計データを算出する、
ことを特徴とする請求項1~5のいずれか1項に記載の統計情報生成システム。 - 移動通信端末を識別する第1の識別情報と、該移動通信端末の位置に関する位置情報と、該位置情報が取得された時刻に関する時刻情報と、を含む位置情報蓄積データを入力する第1の入力手段と、
移動通信端末を識別する第2の識別情報と、該移動通信端末の契約者に関する属性情報と、を含む属性情報蓄積データを入力する第2の入力手段と、
予め定められた電子鍵情報を保持する鍵管理手段と、
前記第1の識別情報及び前記第2の識別情報が入力されて、前記第1の識別情報及び前記第2の識別情報それぞれに対して、前記鍵管理手段が保持する前記電子鍵情報を用いた一方向関数を適用して、第1の非識別化情報及び第2の非識別化情報を出力する一方向演算手段と、
前記位置情報蓄積データから前記第1の識別情報を削除するとともに、前記位置情報蓄積データに対して、前記一方向演算手段によって出力された前記第1の非識別化情報を付加して非識別化位置情報蓄積データを生成する非識別化位置データ生成手段と、
前記属性情報蓄積データから前記第2の識別情報を削除するとともに、前記属性情報蓄積データに対して、前記一方向演算手段によって出力された前記第2の非識別化情報を付加して非識別化属性情報蓄積データを生成する非識別化属性データ生成手段と、
前記非識別化位置情報蓄積データ及び前記非識別化属性情報蓄積データに対する検索条件情報を入力する条件入力手段と、
前記検索条件情報を基に、前記非識別化位置情報蓄積データ及び前記非識別化属性情報蓄積データの一部を抽出する抽出手段と、
前記抽出手段によって抽出された前記非識別化属性情報蓄積データに対して、前記非識別化属性情報蓄積データに含まれる属性情報に対応する係数であって、統計対象の数値への拡大度を示す拡大係数を付与する拡大係数付与手段と、
前記抽出手段によって抽出された前記非識別化位置情報蓄積データと、前記抽出手段によって抽出され、前記非識別化位置情報蓄積データに含まれる前記第1の非識別化情報に対応する前記第2の非識別化情報を有する前記非識別化属性情報蓄積データと、該非識別化属性情報蓄積データに付与された前記拡大係数と、を用いて、人口に関する統計データを算出して出力する統計手段と、
前記抽出手段によって抽出された前記非識別化位置情報蓄積データのデータ数を集計する集計手段と、
前記集計手段によって集計された前記データ数を所定値と比較することによって前記データ数の大小を判定する判定手段と、
前記判定手段によって前記データ数が大きいと判定された場合には、前記統計データを出力し、前記判定手段によって前記データ数が小さいと判定された場合には、前記統計データに含まれる数値を隠蔽して出力する出力手段と、
を備えることを特徴とする統計情報生成システム。 - 第1の入力手段が、移動通信端末を識別する第1の識別情報と、該移動通信端末の位置に関する位置情報と、該位置情報が取得された時刻に関する時刻情報と、を含む位置情報蓄積データを入力する第1の入力ステップと、
第2の入力手段が、移動通信端末を識別する第2の識別情報と、該移動通信端末の契約者に関する属性情報と、を含む属性情報蓄積データを入力する第2の入力ステップと、
条件入力手段が、前記位置情報蓄積データ及び前記属性情報蓄積データに対する検索条件情報を入力する条件入力ステップと、
抽出手段が、前記検索条件情報を基に、前記位置情報蓄積データ及び前記属性情報蓄積データの一部を抽出する抽出ステップと、
拡大係数付与手段が、前記抽出手段によって抽出された前記属性情報蓄積データに対して、前記属性情報蓄積データに含まれる属性情報に対応する係数であって、統計対象の数値への拡大度を示す拡大係数を付与する拡大係数付与ステップと、
統計手段が、前記抽出手段によって抽出された前記位置情報蓄積データと、前記抽出手段によって抽出され、前記位置情報蓄積データに含まれる前記第1の識別情報に対応する前記第2の識別情報を有する前記属性情報蓄積データと、該属性情報蓄積データに付与された前記拡大係数と、を用いて、人口に関する統計データを算出して出力する統計ステップと、
集計手段が、前記抽出手段によって抽出された前記位置情報蓄積データのデータ数を集計する集計ステップと、
判定手段が、前記集計手段によって集計された前記データ数を所定値と比較することによって前記データ数の大小を判定する判定ステップと、
出力手段が、前記判定手段によって前記データ数が大きいと判定された場合には、前記統計データを出力し、前記判定手段によって前記データ数が小さいと判定された場合には、前記統計データに含まれる数値を隠蔽して出力する出力ステップと、
を備えることを特徴とする統計情報生成方法。
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JP2013153287A (ja) * | 2012-01-24 | 2013-08-08 | Ntt Docomo Inc | 情報分析装置および人口分布算出方法 |
JP2013156720A (ja) * | 2012-01-27 | 2013-08-15 | Nippon Telegr & Teleph Corp <Ntt> | 匿名データ提供システム、匿名データ装置、及びそれらが実行する方法 |
JP2013156719A (ja) * | 2012-01-27 | 2013-08-15 | Nippon Telegr & Teleph Corp <Ntt> | 匿名データ提供システム、匿名データ装置、及びそれらが実行する方法 |
JP2013222305A (ja) * | 2012-04-16 | 2013-10-28 | Research Organization Of Information & Systems | 緊急時情報管理システム |
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JP7450685B2 (ja) | 2021-10-15 | 2024-03-15 | 楽天グループ株式会社 | 情報処理装置、情報処理方法、およびプログラム |
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KR101585985B1 (ko) * | 2015-01-19 | 2016-01-15 | 경희대학교 산학협력단 | 개인정보 비식별화 전송장치 및 전송방법 |
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US20230169414A1 (en) * | 2020-04-23 | 2023-06-01 | Ntt Docomo, Inc. | Population extraction device |
US20220138260A1 (en) * | 2020-10-30 | 2022-05-05 | Here Global B.V. | Method, apparatus, and system for estimating continuous population density change in urban areas |
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JP2013125393A (ja) * | 2011-12-14 | 2013-06-24 | Zenrin Datacom Co Ltd | ユーザ情報出力システム、ユーザ情報出力方法及びユーザ情報出力プログラム |
JP2013153287A (ja) * | 2012-01-24 | 2013-08-08 | Ntt Docomo Inc | 情報分析装置および人口分布算出方法 |
JP2013156720A (ja) * | 2012-01-27 | 2013-08-15 | Nippon Telegr & Teleph Corp <Ntt> | 匿名データ提供システム、匿名データ装置、及びそれらが実行する方法 |
JP2013156719A (ja) * | 2012-01-27 | 2013-08-15 | Nippon Telegr & Teleph Corp <Ntt> | 匿名データ提供システム、匿名データ装置、及びそれらが実行する方法 |
JP2013222305A (ja) * | 2012-04-16 | 2013-10-28 | Research Organization Of Information & Systems | 緊急時情報管理システム |
JP2015029216A (ja) * | 2013-07-30 | 2015-02-12 | 株式会社ゼンリンデータコム | 推定値算出装置、推定値算出方法及びプログラム |
JP7450685B2 (ja) | 2021-10-15 | 2024-03-15 | 楽天グループ株式会社 | 情報処理装置、情報処理方法、およびプログラム |
Also Published As
Publication number | Publication date |
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JPWO2011132534A1 (ja) | 2013-07-18 |
KR20120139844A (ko) | 2012-12-27 |
JP5406981B2 (ja) | 2014-02-05 |
US8903791B2 (en) | 2014-12-02 |
EP2562711A4 (en) | 2015-01-14 |
EP2562711A1 (en) | 2013-02-27 |
RU2527754C2 (ru) | 2014-09-10 |
BR112012027137A2 (pt) | 2016-07-26 |
KR20140135244A (ko) | 2014-11-25 |
CN102859547A (zh) | 2013-01-02 |
US20130073577A1 (en) | 2013-03-21 |
RU2012149859A (ru) | 2014-05-27 |
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