元の名称記録: Hitachi, Ltd.

Provided is a wireless environment estimation system that stores stationary structure data including structure data of a stationary structure in a wireless communication area, moving object data including structure data of a moving object in the wireless communication area, and observation region data related to an observation region of an electromagnetic field, uses the stationary structure data and the observation region data to generate a first electromagnetic field analysis model for analyzing an electromagnetic wave reflected by the stationary structure in the observation region, sets a primary wave source at a position of a wireless station, generates a secondary transmission point from an electromagnetic field that is obtained by calculation using the first electromagnetic field analysis model and that reaches the observation region, uses the moving object data and the observation region data to generate a second electromagnetic field analysis model for analyzing an electromagnetic wave emitted from the secondary transmission point, and uses the second electromagnetic field analysis model to calculate an electromagnetic field caused by an electromagnetic wave emitted in a direction opposite to that of an electromagnetic wave reaching the secondary transmission point.

Traveling of a particular mobile body is controlled while the cost of the particular mobile body is kept low. A travel control system for controlling traveling of a particular mobile body that moves in a predetermined range while carrying at least one user includes a sensor terminal removably provided on the particular mobile body, the sensor terminal having a sensor for detecting an object on a route to be followed by the particular mobile body, and a travel controlling apparatus communicably connected to the sensor terminal for generating a travel controlling instruction for moving the particular mobile body to a predetermined location, on the basis of predetermined information including data detected by the sensor and received from the sensor terminal, and inputting the generated travel controlling instruction to the particular mobile body.

A database management apparatus constructs, for each column in input data, a hierarchical histogram of data distribution with respect to the column by repeating division into a prescribed number of areas based on a degree and a base suitable for a multidimensional sorting algorithm and creation of an equal-width histogram as long as an empty bin is present in a histogram, and creates integer value conversion data that maps a value range width of data in the input data to a converted integer value on the basis of the hierarchical histogram. The database management apparatus places the data, which is in the input data, in a database by multidimensionally sorting the input data according to the multidimensional sorting algorithm on the basis of the integer value conversion data of each column.

In a storage system that is connected via networks to a cloud system, which provides an object store, and backs up backup data of a predetermined volume as an object to the object store, the storage system includes a processor, and the processor is configured to determine whether the storage system stores a snapshot associated with a volume at a first point in time to be restored, and restore the volume at the first point in time using the snapshot when it is determined that the storage system stores the snapshot.

An electromagnetic wave information processing device includes an input unit configured to receive a measurement result that measures electromagnetic waves incident on a spacecraft from substantially an omnidirection. A calculation is performed based on information received by the input unit; and an output unit is configured to output a calculation result. The calculation is based on the measurement result received by the input unit, a local omnidirectional feature which is a coefficient of a local basis function indicating a distribution of the electromagnetic waves received by the input unit in a spacecraft coordinate system centered on the spacecraft at a predetermined position in an outer space, and an entire omnidirectional feature which is a coefficient of an entire basis function based on local omnidirectional features and the predetermined positions, thereby generating a map indicating a distribution of an entire electromagnetic wave source including a ground surface and the outer space.