This invention pertains to a low cost, low noise strain sensor based on a web of continuous core-shell nanofibers with conductive shell and mechanically robust core that can be attached or embedded on a variety objects for directional monitoring of static or dynamic changes in mechanical deformation and pressure. An interrogator signal is transmitted from the portable electronic device, triggering a responsive transmission of a password from an electronic key carried by the wearer. This structure allows the formation of a high performance light-emitting element with high luminous efficiency and long lifetime. A layout having a highest acceptability value is determined from a plurality of generated conceptual habitat layout and a file configured to provide a blueprint of the layout is created. The compositions are useful for treating and preventing cancer and sexual dysfunction.