Abstract: A mobile device and a method of manufacturing a mobile device are disclosed. An aspect of the present invention provides a mobile device, which includes: a multi-layer circuit board including a plurality of circuit pattern layers and a plurality of dielectric layers and having a cavity formed on a lateral surface thereof toward an inside thereof; an electrode pad laminated in the cavity and configured to be electrically connected with the circuit pattern layers; and a conductive switch formed on an external peripheral portion of the cavity of the multi-layer circuit board in such a way that the conductive switch is separated from the electrode pad and is contactable with the electrode pad by an external force.

Abstract: A mobile device and a method of manufacturing a mobile device are disclosed. An aspect of the present invention provides a mobile device, which includes: a multi-layer circuit board including a plurality of circuit pattern layers and a plurality of dielectric layers and having a cavity formed on a lateral surface thereof toward an inside thereof; an electrode pad laminated in the cavity and configured to be electrically connected with the circuit pattern layers; and a conductive switch formed on an external peripheral portion of the cavity of the multi-layer circuit board in such a way that the conductive switch is separated from the electrode pad and is contactable with the electrode pad by an external force.

Abstract: The present invention relates to a propellant composition which comprises hydroxy-terminated polyether (HTPE), N-butyl-(2-nitratoethyl)nitramine (BuNENA) and ammonium perchlorate (AP) and is insensitive to impact and thermal reactions and thus suitably used for a solid rocket propulsion unit.

Abstract: Disclosed is a method for improving the bonding property between a rubber material and an epoxy resin-based composite, particularly which can improve bonding of the rubber material to the epoxy resin-based composite without using an interfacial adhesive layer, by using, as the rubber material to be adhered to the epoxy resin-based composite, a mixture of an epoxy resin and rubber, wherein the method comprises laminating a layer of the composite and a layer of the rubber-epoxy resin mixture, and co-curing the composite layer and the rubber-epoxy resin mixture layer at the same time.