The present invention provides an angle adjustment device for a bicycle saddle which can adjust the angle of the saddle even when the bicycle is moving. Specifically, a method is provided in a user equipment for optimizing a system resource related to a random access channel in a wireless communication system. Centrifugal forces are used to assist the movement of the working fluid within the heat pipe. A plurality of global wordlines are couple to the left and right voltage converters of each subarray and are configured to establish the drive levels for respective wordlines of the subarrays.