Disclosed herein are a recess-gate structure in which junctions have a thickness significantly smaller than the thickness of a device isolation layer to thereby prevent shorting of the junctions located at opposite lateral sides of the device isolation layer close thereto, resulting in an improvement in the operational reliability of a resultant device, and a method for forming the same. The present invention also describes the method of manufacture and method of use for such laminated composite radius filler. Each lug has a connection portion via which it is connected to a belt portion of the collar, which connection portion is upstanding relative to said belt portion, and a tightening wall, with which the tightening means come into engagement and which is folded back towards the belt portion. Embodiments of the software self-checking mechanisms can be implemented such that they are relatively stealthy and robust, and so that it they are compatible with copy-specific static watermarking and other tamper-resistance techniques. The at least one cam element is operatively connected to a spring-loaded tappet element and is arranged outside the circumferential control surfaces and at a level of a zero-lift position of the circumferential control surfaces.