A semiconductor device has a substrate with a plurality of conductive vias and conductive layer formed over the substrate. In one preferred embodiment, an intrusion detection system includes at least two sensors to monitor different aspects of a computer network, such as a sensor that monitors network traffic and a sensor that discovers and monitors available network resources. A first AC power converter provides DC power to a common DC bus of the power supply. Further, according to this program, when a slice plane is specified in one of the 3-dimensional images on the left and right sides, a slice plane at the symmetrical position is automatically formed in the other image. A multi-tiered approach may be employed to combine the frequency domain analysis with existing spatial domain techniques. A system for surgical planning is also disclosed.