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    • 10. 发明专利
    • DATA BASE DEVICE FOR SHIP
    • JPS63217450A
    • 1988-09-09
    • JP5091087
    • 1987-03-05
    • NIPPON KOKAN KKJAPAN SHIPBUILDING RES ASS
    • KAIKAWA YOSHIMASAOZAWA KANJISHONO TETSUJI
    • G06F12/14G06F12/00G06F21/22G06F21/24
    • PURPOSE:To easily check and correct the destruction and falsification of data on a data base by reading out the same data after increasing the number of accesses within the ranges of 1st-3rd data bases out of the signal contents of the deciding results obtained from a class deciding means in response to general, medium and advanced classes respectively. CONSTITUTION:In case an ID code is inputted from a card reader 32 only, a general operator is discriminated and the data on a 1st data base is read out. When an ID code and a password are inputted from the reader 32 and a password input equipment 33 respectively, a medium operator is discriminated and the data on the 1st and 2nd data bases are read out. When an ID code, a password and an answer signal are inputted fro the reader 32, the input equipment 33 and a transmitter/receiver 34 respectively, an advanced operator is discriminated and the data on the 1st-3rd data bases are read out. In such a way, the advanced operator can easily detect the destruction of the data on the data base with reference to the 1st-3rd data bases 42-44 via the advance operator even though the general operator destroys said data.