Semiconductor structures are disclosed that include at least one FET gate stack located on a semiconductor substrate. An example method for sensing a body present within an area of a pit at a loading dock includes monitoring the area of the pit via a sensor system by capturing an image of the area, comparing the captured image to a reference image to determine whether a body is present in the area of the pit, and commanding a deck of a dock leveler to not lower relative to the pit if the body is present. Embodiments of the present invention can be used to rearrange files stored in a storage medium so that files which tend to be used together are stored closer to each other. Bulk content is copied to selected locations based on desired duplication, available storage, distance, transmission cost, data path bandwidth or utilization, likelihood of retrieval calculated from the metadata, requests to use or prior usage of content or information from a system that manages the content. The location coordinates of the objects of interest are stored and additional images of the candidate cell objects are acquired at high magnification. A second path carries the medium at a second temperature adjacent to the first path.