A software module is implemented on a web site to calculate shipping rates based on different formulas and equations which will be beneficial to an operator of an e-commerce web site by increasing gross profit from shipping charges. The imaging device further comprises: a reference clock unit generating a reference clock; and a signal inputoutput unit provided between the imaging unit and the control unit and inputting and outputting signals in synchronization with the reference clock generated by the reference clock unit. In particular, the tongue traversing the throat is attached to the exterior surface of the upper about the toe box. When the upstream device outputs a turn-off signal to the downstream device, a time period is counted. This may be accomplished by running each lead directly away from the microfluidic complex, through a thermally isolating substrate. It is possible to constantly control an openclose velocity of a power trunk regardless of a change of external environments when a power trunk is opened or closed in a vehicle having a power trunk system.