INFORMATION PROCESSING APPARATUS AND COMPUTER PROGRAM PRODUCT

• US 20130254427A1
• Filed: 12/21/2012
• Published: 09/26/2013
• Est. Priority Date: 03/26/2012
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kozakai, Yasuyuki
• Granted Patent: US 9,195,262 B2
• Time in Patent Office: Days
• US Class Current: 709/248
• CPC Class Codes: G06F 1/14 Time supervision arrangements, e.g. real time clock

Abstract

According to an embodiment, an information processing apparatus includes a selector. The selector is configured to acquire a first time obtained by converting a measurement time of a first piece of measurement data based on a clock of a first time server, a second time obtained by converting the measurement time of the first piece of measurement data based on a clock of a second time server, a third time obtained by converting a measurement time of a second piece of measurement data based on the clock of the first time server, and a fourth time obtained by converting the measurement time of the second piece of measurement data based on the clock of the second time server. The selector is also configured to select a time server with the largest number of combinations of the converted times resulting in no error among pieces of measurement data and time servers.

Claims

1. An information processing apparatus, comprising:

a selector configured to

acquire a first converted time obtained by converting a measurement time of a first piece of measurement data on the basis of a clock of a first time server, a second converted time obtained by converting the measurement time of the first piece of measurement data on the basis of a clock of a second time server, a third converted time obtained by converting a measurement time of a second piece of measurement data on the basis of the clock of the first time server, and a fourth converted time obtained by converting the measurement time of the second piece of measurement data on the basis of the clock of the second time server,

determine whether an error occurs on the basis of the first, second, third, and fourth converted times,

calculate the number of combinations of the first, second, third, and fourth converted times in which it is determined that no error occurs among two or more pieces of measurement data and two or more time servers, and

select a time server with the largest number of combinations.

2. The apparatus according to claim 1, wherein the selector calculates a first difference between two converted times among the first, second, third, and fourth converted times, calculates a second difference between two converted times other than the converted times used to calculate the first difference among the first, second, third, and fourth converted times, calculates a third difference using the first difference and the second difference, calculates the third difference among two or more pieces of measurement data and two or more time servers, and determines that no error occurs when it is determined that the third difference is less than a threshold value.

3. The apparatus according to claim 1, wherein the selector selects the time server except for the first time server included in the combination which is determined to have an error.

4. The apparatus according to claim 1, further comprising:

a measurement unit configured to measure a physical amount and output measurement data; and

a transmitting unit configured to transmit the measurement data output from the measurement unit and a plurality of converted times obtained by converting a time when the measurement data is measured by using the clocks of the plurality of time servers.

5. The apparatus according to claim 1, further comprising:

an analyzing unit configured to analyze one or more pieces of measurement data and a converted time obtained by converting the measurement time of the measurement data on the basis of the clock of the first time server selected by the selector and generate an instruction code on the basis of the analysis result; and

a transmitting unit configured to transmit the instruction code generated by the analyzing unit to a receiving apparatus.

6. The apparatus according to claim 1, further comprising:

a measurement unit configured to measure a physical amount and output measurement data; and

a transmitting unit configured to transmit the measurement data output from the measurement unit and a time when the measurement data is measured.

7. A computer program product comprising a computer-readable medium containing a program executed by a computer, the program causing the computer to execute:

acquiring a first converted time obtained by converting a measurement time of a first piece of measurement data on the basis of a clock of a first time server, a second converted time obtained by converting the measurement time of the first piece of measurement data on the basis of a clock of a second time server, a third converted time obtained by converting a measurement time of a second piece of measurement data on the basis of the clock of the first time server, and a fourth converted time obtained by converting the measurement time of the second piece of measurement data on the basis of the clock of the second time server;

determining whether an error occurs on the basis of the first, second, third, and fourth converted times;

calculating the number of combinations of the first, second, third, and fourth converted times in which it is determined that no error occurs among two or more pieces of measurement data and two or more time servers; and

selecting a time server with the largest number of combinations.

8. The product according to claim 7, wherein

the determining includes

calculating a first difference between two converted times among the first, second, third, and fourth converted times;

calculating a second difference between two converted times other than the converted times used to calculate the first difference among the first, second, third, and fourth converted times;

calculating a third difference using the first difference and the second difference;

calculating the third difference for two or more pieces of measurement data and two or more time servers; and

determining that no error occurs when it is determined that the third difference is less than a threshold value.

9. The product according to claim 7, wherein the selecting includes selecting the time server except for the first time server included in the combination which is determined to have an error.