Provided are a detector circuit which has a simple circuit configuration, is capable of indicating an accurate power according to a load fluctuation of a radio frequency power amplifier or a difference in a modulation mode, and can be easily incorporated in the radio frequency power amplifier, and a wireless communication system using the detector circuit. The neuronal cell is positioned on the substrate in a predefined orientation. Also, the management apparatus correlates and manages the detection information and mounting location information received from the sensor control means. Communication with the master device and controller not having ownership is blocked, making the controller look busy to the master device and making the master device look idle to the controller. The side planer itself may include a ramped surface for loading the object prior to securing to the host vessel.