True/false decision method for deciding whether search query containing logical expression is true or false
US8655921B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2009 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Sep 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/8373
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
When a searching apparatus accepts a search condition including a logical condition formed of variables, transition table is created by using a BDD method. In the transition table, a combination of a bit string indicative of true or false of a variable at each level for arriving from a starting-point variable to an arrival variable and the starting-point variable is associated with the arrival variable. Then, a true/false decision on the search condition of the search target data is made by, with an arrival variable of a transition destination being taken as the starting-point variable, extracting a bit string of a predetermined number of digits from the starting-point variable from among logical bit strings of the search target data and specifying the arrival variable as the transition destination based on the combination and the transition table.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.