A driver assistance system includes a mobile terminal provided on an automobile, and a detection server capable of communicating with the mobile terminal. Each concentric capacitor comprises a first plurality of perimeter plates formed on a first layer of a substrate and a second plurality of perimeter plates formed on a second layer of the substrate. The first support and the second support are mounted pivotally in the connector and rotate synchronously, and each has a protrusion. The system may be used for interactive interstitial photodynamic tumour therapy. Also, the sections have their lengths twice, or longer, as the respective grating periodicity. Also provided are pharmaceutical compositions comprising one or more compounds of Formula I.