Abstract: A double-sided aspheric diffractive multifocal lens and methods of manufacturing and design of such lenses in the field of ophthalmology. The lens can include an optic comprising an aspheric anterior surface and an aspheric posterior surface. On one of the two surfaces a plurality of concentric diffractive multifocal zones can be designed. The other surface can include a toric component. The double-sided aspheric surface design results in improvement of the modulation transfer function (MTF) of the lens-eye combination by aberration reduction and vision contrast enhancement as compared to one-sided aspheric lens. The surface having a plurality of concentric diffractive multifocal zones produces a near focus, an intermediate focus, and a distance focus.

Abstract: A method for distributed delegation and verification includes: a service provider generating first delegation information including authorization credentials and self-signed credentials thereof to establish a delegation relationship with a first service node; the first service node generating second delegation information including the authorization credentials in the first delegation information and self-signed credentials thereof to establish a delegation relationship with a service requestor; upon receipt from the service requestor of a service request including the delegation information issued to the service requestor, the service provider requesting the first service node to verify the self-signed credentials in the delegation information in the service request; the first service node performing verification; and upon successful verification by the first service node, the service provider verifying the authorization credentials in the delegation information in the service request and, upon successful ve

Abstract: In a method and system for providing Internet Key Exchange (IKE) during a Session Initiation Protocol (SIP) signaling session, the method includes: enabling a caller end node device to send a first SIP request message to a callee end node device, wherein the first SIP request message includes a payload unit of a first IKE quick mode initial message; enabling the callee end node device to respond to the first SIP request message with an SIP response message, wherein the SIP response message including includes a payload unit of an IKE quick mode response message; and enabling the caller end node device to send a second SIP request message to the callee end node device, wherein the second SIP request message includes a payload of a second IKE quick mode initial message.