As disclosed herein a computer system for secure database backup and recovery in a secure database network has N distributed data nodes. The computer system includes program instructions that include instructions to receive a database backup file, fragment the file using a fragment engine, and associate each fragment with one node, where the fragment is not stored on the associated node. The program instructions further include instructions to encrypt each fragment using a first encryption key, and store, randomly, encrypted fragments on the distributed data nodes. The program instructions further include instructions to retrieve the encrypted fragments, decrypt the encrypted fragments using the first encryption key, re-encrypt the decrypted fragments using a different encryption key, and store, randomly, the re-encrypted fragments on the distributed data nodes. A computer program product and method corresponding to the above computer system are also disclosed herein.

The present invention relates to an electronic abacus including: a plurality of abacus beads fitted on each of unit-specific support rods mounted on an abacus frame to be slidable in a vertical direction; an abacus bead position detecting unit including a plurality of position detecting means for detecting a position change of each abacus bead from lower parts of the abacus beads fitted on each of the unit-specific support rods; an abacus bead guide panel in which unit-specific guide blocks for guiding movement of the abacus beads fitted on each of the unit-specific support rods are integrally connected to cover all of the abacus bead position detecting unit; and a plurality of abacus bead moving members provided in a number which is the same as that of the abacus beads in the guide panel to movably support the abacus beads fitted on each of the support rods.

The present invention relates to an electronic abacus including: a plurality of abacus beads fitted on each of unit-specific support rods mounted on an abacus frame to be slidable in a vertical direction; an abacus bead position detecting unit including a plurality of position detecting means for detecting a position change of each abacus bead from lower parts of the abacus beads fitted on each of the unit-specific support rods; an abacus bead guide panel in which unit-specific guide blocks for guiding movement of the abacus beads fitted on each of the unit-specific support rods are integrally connected to cover all of the abacus bead position detecting unit; and a plurality of abacus bead moving members provided in a number which is the same as that of the abacus beads in the guide panel to movably support the abacus beads fitted on each of the support rods.

Provided is a numerical value input apparatus that includes: an operation input unit that expresses numerical values of a plurality of digits by providing a plurality of numerical value setting operation units for each digit; with each of the plurality of numerical value setting operation units being biased to a side that is an initial state; and also includes a signal generation unit that, in a case in which an input confirmation key provided separately from the numerical value setting operation units is operated, confirms a numerical value that reflects the state of the numerical value setting operation units for each digit when the input confirmation key is operated, and converts the numerical value into an electric signal.

An educational device for counting and mathematics. The educational device includes a frame that includes a first end, a second end, and a releasable connection point configured to attach to an additional frame. The educational device further includes a first group adjacent to the first end and including a bead. The educational device further includes a second group adjacent to the second end and including a second bead. The educational device can further include a divider located between the first and the second end. The divider can separate the first group from the second group.

An educational device for counting and mathematics. The educational device includes a frame that includes a first end, a second end, and a releasable connection point configured to attach to an additional frame. The educational device further includes a first group adjacent to the first end and including a bead. The educational device further includes a second group adjacent to the second end and including a second bead. The educational device can further include a divider located between the first and the second end. The divider can separate the first group from the second group.

This tool for recording the number of swings in a ball game includes a plurality of holed beads 20 and a cord 30 that is passed through the holes 20H of the beads 20 and that holds the beads 20 so that the beads 20 can slide, the cord 30 is formed from a cord material that does not stretch in an axial direction but that stretches in a diametrical direction and that is normally urged in a diameter-expanding direction, and the cord 30 constrict in diameter so as to elastically interlock with the walls of the holes 20H of the beads 20 and hold the beads 20 in position, whereby the beads do not shift even if a player strongly shakes the tool, the number of swings in the ball game can be reliably recorded and confirmed, and the tool is easily assembled.

This tool for recording the number of swings in a ball game includes a plurality of holed beads 20 and a cord 30 that is passed through the holes 20H of the beads 20 and that holds the beads 20 so that the beads 20 can slide, the cord 30 is formed from a cord material that does not stretch in an axial direction but that stretches in a diametrical direction and that is normally urged in a diameter-expanding direction, and the cord 30 constrict in diameter so as to elastically interlock with the walls of the holes 20H of the beads 20 and hold the beads 20 in position, whereby the beads do not shift even if a player strongly shakes the tool, the number of swings in the ball game can be reliably recorded and confirmed, and the tool is easily assembled.

As disclosed herein a computer system for secure database backup and recovery in a secure database network has N distributed data nodes. The computer system includes program instructions that include instructions to receive a database backup file, fragment the file using a fragment engine, and associate each fragment with one node, where the fragment is not stored on the associated node. The program instructions further include instructions to encrypt each fragment using a first encryption key, and store, randomly, encrypted fragments on the distributed data nodes. The program instructions further include instructions to retrieve the encrypted fragments, decrypt the encrypted fragments using the first encryption key, re-encrypt the decrypted fragments using a different encryption key, and store, randomly, the re-encrypted fragments on the distributed data nodes. A computer program product and method corresponding to the above computer system are also disclosed herein.

The invention is directed to an improved abacus and related calculating method. The improved abacus and method are adapted to perform mathematical operations including addition, subtraction, multiplication, division and factoring. Additional mathematical operations are performable using described techniques. The improved abacus has a frame divided into an upper and lower section by a horizontal bar. The abacus includes a plurality of rods in which each rod contains four movable beads on the upper section of each rod and one movable bead on the lower section of each rod. The beads in the upper section have a value of two and the bead in the lower section has a value of one. Beads moved toward the bar are counted while those beads away from the bar are not counted. The improved abacus also includes a unit indicator, mathematical operational signs and positive and negative sliding indicators signs on the frame.