A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. When readout of data from at least one volatile memory has been finished, the volatile memory is shifted from the refresh operation mode to the self-refresh operation mode. An embodiment also relates to a gate stack structure that provides a composition that resists the redeposition of metal during processing and field use. In another aspect of the present invention, there is provided an automatic self-calibration between the fixed lens static camera and the PTZ camera. The model may be implemented to perform tradeoff decisions for each individual component and interrelated components. The decision unit decides timing of temporarily stopping the use of the display part.