Abstract: Provided is an invention for efficiently searching for books used in training to reduce metathesis. A book search database storage unit 110 stores a book search database in which information identifying a book, information regarding a frequency of a proximity number for a mora character notation pair appearing in forward order in the book, and information regarding a frequency of a proximity number for the mora character notation pair appearing in reverse order are associated with each other. A display unit 300 displays a book search screen including a correctly pronounced phrase input region and an incorrectly pronounced phrase input region. A subject pronunciation designation unit 120 determines two mora character notations and a proximity number to use as search conditions based on an input of the correctly pronounced phrase input region and an input of the incorrectly pronounced phrase input region.

Abstract: Provided is a learning assistance technology that uses a learning history to check the level of comprehension by a learner in relation to a learning target.

Abstract: A machine tool having an automatic tool changer including a single drive motor for rotation and lateral movement of a tool storage magazine of the automatic tool changer. The single drive motor is connected to a transmission for selectively moving the magazine between a withdrawn storage position and an advanced position whereby a selected tool holder may be brought into engagement with the spindle. A carriage frame supports the magazine on a trackway for lateral movement and a rack gear extends parallel to a trackway. A speed reducer is connected to the drive motor and has an output shaft that supports a pinion gear positioned to engage the rack and a casing that is connected to the magazine.