Abstract: Disclosed are a structure and a clock synchronization method of a precision network interface card for acquiring heterogeneous PTP synchronization information for PTP synchronization network extension. In order to precisely time-synchronize a synchronous switch at a remote location with a synchronous switch of an internal network, a precision time protocol (PTP) synchronous network system and a PTP synchronization method according to an embodiment allow a plurality of switches therebetween to operate as virtual nodes and can precisely measure Ingress_Time of a time synchronization message using a clock synchronized with the virtual nodes.

Abstract: A deco glass panel including a mother substrate formed of glass, a glass powder layer welded on the mother substrate and a rear surface pattern disposed on a rear surface of the mother substrate, wherein the rear surface pattern is located within an outline of the glass powder layer when viewed from the front surface of the mother substrate.

Abstract: A deco glass panel including a mother substrate formed of glass, a glass powder layer welded on the mother substrate and a rear surface pattern disposed on a rear surface of the mother substrate, wherein the rear surface pattern is located within an outline of the glass powder layer when viewed from the front surface of the mother substrate.