Fujitsu Corporation

Masahiro Kurishima

Masahiro Kataoka

Hideo Kasai

Hiroyuki Torii

Takashi Tsubokura

Ryouta Komatsu

An information retrieval apparatus including a first detecting unit that detects a feeder indicative of a presence of a numerical value in a file subject to retrieval in which a numeral and a character are present together; a second detecting unit that detects a number of places in the numerical value correlated to the feeder detected by the first detecting unit; and a compressing unit that compresses the numerical value into compressed information including a compression code for a numeral indicative of the number of places detected by the second detecting unit and a compression code for a numeral at each place in the numerical value, wherein the numerical value is correlated to the feeder based on an appearance frequency of a numeral included in the file.

Information retrieval method, information retrieval apparatus, and computer product

A computer-readable recording medium stores therein an information retrieval program that causes a computer to execute a retrieval process in which files to be retrieved are narrowed down by using a bit string for each character in the files to find characters making up a retrieval keyword to retrieve a keyword identical to or related to the retrieval keyword in the files to be retrieved. The bit strings indicate the presence of the characters in the files. The information retrieval program causes the computer to execute extracting, from among the bit strings, a bit string of an arbitrary character; and compressing the extracted bit string, by using a special Huffman tree having leaves of plural types of symbol strings covering patterns represented by a predetermined number of bits and a special symbol string having a number of bits greater than the predetermined number of bits.

Computer product, information retrieval method, and information retrieval apparatus

An information retrieval apparatus includes an acquiring unit that acquires a numerical value defining a boundary of a numerical range; a detecting unit that detects a number of places in and a head numeral of the numerical value; an extracting unit that extracts from a bit string group, a bit string indicating whether a numerical value in a numerical value group having the number of places and the head numeral is present in files subject to retrieval; a specifying unit that specifies a file corresponding to a bit in the extracted bit string, the bit indicating the presence of a numerical value of the numerical value group; a determining unit that determines whether a numerical value in the specified file meets the boundary condition; and a designating unit that, based on a determination by the determining unit designates the specified file to have a numerical value within the numerical range.

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Kawasaki, Japan

Masahiro Kurishima