The systems and methods maintain varying protection levels of related objects, such as when nodes of a data structure are protected at the same or greater protection level as their children nodes. The method includes detecting, at the second transceiver, a signal failure of a signal transmitted from the first transceiver and, upon detecting the signal failure, signalling the first transceiver to change its compensation function. Different types of wobbles are formed on the grooves of either the user data area or the lead-out area, thereby preventing an optical pickup that performs recordingreproduction from deviating from the user data area. A dome formed at the top portion inside the furnace is used as an enclosure where the heated inert gas is almost kept. The server may calculate the client’s position using dead reckoning and send updates to clients when errors between actual and calculated positions exceed a threshold. The powder compositions may be used as a food ingredient andor as a component of a food ingredient in various edible products.