Abstract: An information processing system includes a number of database servers deployed onto a number of physical nodes in a distributed manner. Among the database servers, at least two servers taking care of data different from one another are deployed onto the same physical node and at least one server taking care of the same data as any of the at least two servers are deployed onto at least one other physical node. A distribution section distributes connections by monitoring load on each of the physical nodes and moving a connection with a client from a database server on a physical node with load heavier than a target to a database server on a physical node with load lighter than the target so that the connections are distributed to balance the load.

Abstract: An information processing system includes a number of database servers deployed onto a number of physical nodes in a distributed manner. Among the database servers, at least two servers taking care of data different from one another are deployed onto the same physical node and at least one server taking care of the same data as any of the at least two servers are deployed onto at least one other physical node. A distribution section distributes connections by monitoring load on each of the physical nodes and moving a connection with a client from a database server on a physical node with load heavier than a target to a database server on a physical node with load lighter than the target so that the connections are distributed to balance the load.

Abstract: The present invention provides a search apparatus, method and program using a public search engine, which is capable of acquiring necessary information without allowing confidential information to be inferred. Input of a desired search word comprising characters is received, and characters are extracted from the search word. Multiple character strings comprising the extracted characters are generated. A word is selected as a noise word, and characters are selected from the noise word. A noise character string comprising the extracted characters is generated. A query is generated by combining the character strings and noise character strings, and is transmitted to the search engine. A search is performed by use of the search word over a search result transmitted from the search engine in reply to the query, and the search result is displayed.

Abstract: The present invention provides a search apparatus, method and program using a public search engine, which is capable of acquiring necessary information without allowing confidential information to be inferred. Input of a desired search word comprising characters is received, and characters are extracted from the search word. Multiple character strings comprising the extracted characters are generated. A word is selected as a noise word, and characters are selected from the noise word. A noise character string comprising the extracted characters is generated. A query is generated by combining the character strings and noise character strings, and is transmitted to the search engine. A search is performed by use of the search word over a search result transmitted from the search engine in reply to the query, and the search result is displayed.

Abstract: A position control device for a servomotor in use of a NC machine tool, a robot or the like detects a case that a control shaft is collided with something in error to stop the servomotor at a high speed so as to minimize damages of the machine. When an estimated disturbance torque estimated by a disturbance torque observer 9 is over an allowance disturbance torque, an alarm signal is outputted. At this point, a plugging control unit 11 outputs a braking torque current command in a direction of stopping the servomotor until the servomotor 5 is stopped. An operation mode determination unit 12 receives an operation mode of the machine during the operation to set the allowance disturbance torque corresponding to the operation mode to the determination unit 10. According to the present invention, the detection of the collision of the machine 6 can be performed at higher speed and a braking distance after the detection so that damages of the machine during the motor rotates at a high speed can be minimized.