背影的经典句子>冲动是魔鬼
专利名称:DATA RETRIEVAL SYSTEM
文化海报
治疗鼻炎的方法发明人:DOI TSUGUNORI,KURASAWA TORU 申请号:JP24649784
申请日:19841121
言字旁的字有哪些字
公开号:JPS61123929A
公开日:
专才
备战中考作文19860611
专利内容由知识产权出版社提供
摘要:PURPOSE:To reduce the CPU using frequency caud by a bit operation and the number of I/O times between bit map files by making the bit map at every conditions unnecessary and further to make a two-bit operation for processing an AND unnecessary. CONSTITUTION:The partial t of data corresponding to retrieval conditions is retrieved from a retrieval subject file 21, and bad on the retrieved result the bit map is generated by a bit map generating part 12 and provisionally stored in the bit map file 22 through a buffer 13. A bit map arithmetic part 14 reads the bit map on the file 22 through the buffer 13, and executes directly the bit arithmetic processing of an AND with respect to the bit map through a bit operation bad on the partial t of other data available from a retrieval part 11. The bit map available from the result of the arithmetic processing is again stored on the bit map file 22 through the buffer 13.
申请人:NEC CORP
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