Abstract: An indoor unit included in an air conditioner that includes an outdoor unit includes a power receiving circuit (PR2), a low-frequency transmission and reception circuit as a first reception circuit, a high-frequency transmission and reception circuit as a transmission and reception circuit, and an inner-controller. The low-frequency transmission and reception circuit receives a current signal transmitted from an outdoor unit by using a current loop formed by a power line included in power supply wiring. For a first communication state in which physical connection between with the outdoor unit is recognized and a second communication state in which communication for operation of the air conditioner is performed between with the outdoor unit, the inner-controller selects use of the low-frequency transmission and reception circuit and the high-frequency transmission and reception circuit in the first communication state and the second communication state.

Abstract: A delivery vehicle management system stores a delivery plan information regarding a traveling scheduled path of each of a plurality of delivery vehicles, acquires a position information indicating a current position of each delivery vehicle, calculates an expected arrival time for each delivery vehicle to reach a cross dock based on the delivery plan information and the position information of each delivery vehicle, specifies the delivery vehicle in which a standby time occurs when each delivery vehicle is permitted to use the cross dock in an order in which the expected arrival time is earlier, and a length of the standby time of each delivery vehicle, and notifies a driver of the delivery vehicle specified by the specifying unit of a time point delayed from the expected arrival time by the length of the standby time as a time point at which use of the cross dock can be started.

Abstract: An operation management system manages the operation of a transport vehicle that transports a freight W from a first cross dock to a second cross dock. The operation management system includes a freight information acquisition unit that acquires freight information including a delivery destination of the freight for each freight, a number determination unit that determines the required number of transport vehicles for transporting the freight from the first cross dock to the second cross dock based on the freight information acquired by the freight information acquisition unit, and an output unit that outputs information regarding the required number determined by the number determination unit.