High-level controlled airspace, in turn, exists from FL180 to FL600 in SDA. In NDA, however, the floor of Class A high-level airspace varies between FL230, in what is referred to as the Northern Control Area, and FL270, in what is referred to as the Arctic Control Areas.
Short for DVI (Digital Visual Interface) Integrated, DVI-I is the connection, or interface used between monitors and computers or home theater systems. DVI-I is used to interface with an LCD or CRT monitor display for digital video output. DVI-I supports both digital and analog. However, it will not use both at the same time. DVI-I detects and chooses digital or analog depending on the connected display. Contrast with DVI-D, which is a digital-only interface and DVI-A which is an analog-only interface.
Surgery for deep venous incompetence. Deep venous incompetence (DVI) is a problem in the veins that can lead to leg ulcers (sores), pain and swelling. It may be caused by a problem in the valves of the vein, by a blockage of the veins or by a combination of these events. For most people, wearing special compression stockings and treating the ulcers is enough. When this does not ease the problem, surgery is sometimes tried.