A method and apparatus are described for supporting dynamic and distributed mobility management. The electronic circuit includes a detecting part for generating a tune voltage corresponding to a process variation value of the at least one resistor, and a compensating part for compensating for a process variation of the at least one resistor using the tune voltage. Numerous materials are disclosed which can be used to create these layers. For example, an image of the Titanic that appears in a historical or cultural book may be associated with the search keyword \u201cship. In some embodiments, the apparatus and methods provide for detection and delivery of therapy for hemodynamically stable and hemodynamically unstable tachycardias by varying a number of intervals detected threshold based on hemodynamic measurements. A controller controls brightness of the light emitted from the electroluminescence element based on the brightness of the ambient light.