Abstract: A nitride semiconductor epitaxial substrate includes: a Si substrate; a nitride semiconductor epitaxial layer disposed above the Si substrate; and a mixed crystal layer disposed between the Si substrate and the nitride semiconductor epitaxial layer, and containing Si and a group III metal element, the mixed crystal layer containing a high concentration of C. The mixed crystal layer has a concentration of at least 1.0×10+21 cm?3, and a transition metal element concentration of at most 5.0×10+16 cm?3.

Abstract: To determine the state of a subject person with a simple structure, an image determining device includes: an imaging unit that captures an image from a first direction, the image including the subject person; a first detector that detects size information from the image, the size information being about the subject person in the first direction; a second detector that detects position-related information, the position-related information being different from the information detected by the first detector; and a determining unit that determines the state of the subject person, based on a result of the detection performed by the first detector and a result of the detection performed by the second detector.

Abstract: A target parking position setting section (23) is adapted to temporarily set a target parking position (p31, p32, p33) for the vehicle for each parking mode in a predetermined stop position. A parking mode determining section (25) is adapted to determine the parking mode and the target parking position corresponding to the parking mode based on an operation of a steering wheel performed by a driver after the target parking position (p31, p32, p33) is set. A guiding section (29) is adapted to guide the vehicle (1) to the determined target parking position (P3).