Abstract: Provided is a technique for a data-driven database which frees a user from having to be conscious of a sequence in which instructions of a program for accessing a database are described, an interrelation of data items, and the like, and from having to describe redundant instructions. A data-driven database processor includes: schema definition storage means 2 for storing a schema definition of a database 24; derived definition storage means 3 for storing a derived definition describing a cause-and-effect relationship that exists when a value of a given data item is derived from a value of another data item; derived definition processing means 26 for generating a trigger program 27 that makes a chain of changes to values of data items based on the cause-and-effect relationship described in the derived definition; and a database management system 23 for executing the trigger program 27 when a change is made to the other data item that affects the value of the given data item.

Abstract: Provided is a technique for a data-driven database which frees a user from having to be conscious of a sequence in which instructions of a program for accessing a database are described, an interrelation of data items, and the like, and from having to describe redundant instructions. A data-driven database processor includes: schema definition storage means 2 for storing a schema definition of a database 24; derived definition storage means 3 for storing a derived definition describing a cause-and-effect relationship that exists when a value of a given data item is derived from a value of another data item; derived definition processing means 26 for generating a trigger program 27 that makes a chain of changes to values of data items based on the cause-and-effect relationship described in the derived definition; and a database management system 23 for executing the trigger program 27 when a change is made to the other data item that affects the value of the given data item.

Abstract: A nonreciprocal circuit device having good characteristics capable of maintaining constantly stable and reliable connections even when a high temperature is applied, and a communication apparatus incorporating the nonreciprocal circuit device. The nonreciprocal circuit device can be made compact at a low cost and can obtain a large attenuation at a predetermined frequency band. In the nonreciprocal circuit device, an upper yoke is connected to a lower yoke, a bottom grounded part of a magnetic assembly is connected to the lower yoke. In addition, ports P1 and P2 of first and second central conductors, the hot-side electrodes of first and second capacitors, and input/output terminals are connected each other, and the port P3 of a third central electrode, the hot-side electrode of a third capacitor, and the hot-side electrode of a terminating resistor R are connected to each other.