Abstract: A motor control device according to an embodiment includes a hardware processor configured to: calculate a first torsion torque generated by a motor shaft according to fluctuation of an engine torque based on a difference between a motor angle as a rotation angle of the motor shaft and a shaft angle as a rotation angle of a transmission shaft of a transmission on the downstream side of a damper; calculate a first vibration damping torque to be output by a motor generator to damp vibration of the motor shaft based on the first torsion torque and a drive state value indicating a drive state of an engine; and output a motor torque command value to be provided to the motor generator based on the first vibration damping torque.

Abstract: A method and system for retrieving information from a set of documents using one retrieval keyword or more is capable of remarkably increasing the relevance ratio of a retrieval result. The system includes a category dictionary for storing category information containing morphemes included in the documents in a hierarchical structure, a morpheme-ID array produced by converting the set of documents into a set of fixed-length IDs in accordance with the morphemes while maintaining order information of the morphemes, and a retrieval part for retrieving a morpheme ID from the morpheme-ID array. The retrieval part retrieves a morpheme ID of the retrieval word and of any morpheme co-occurring with the retrieval word and having category information which matches retrieval-category information.