Abstract: A moving object cabin includes a body having an opening open in a predetermined first direction and defining an internal space communicating with the opening, a cover provided to open or close the opening, and a cover moving part disposed in the internal space of the body and coupled to the cover to move the cover.

Abstract: Provided is a method of manufacturing an ethylene vinyl alcohol copolymer, the method including: introducing a monomer including ethylene and vinyl acetate, and a first solvent into a reactor to manufacture an ethylene vinyl acetate copolymer through polymerization; recovering unreacted ethylene after the polymerization; recovering unreacted vinyl acetate after the polymerization; introducing a second solvent different from the first solvent to manufacture an ethylene vinyl alcohol copolymer from the ethylene vinyl acetate copolymer through transesterification; and separating the second solvent-derived acetate produced from the transesterification by the method described herein.

Abstract: Disclosed is a method and apparatus for providing a group call service using mobile voice over Internet protocol (mVolP). According to one embodiment, an interface is provided to transmit a request signal for a group call to members of a group chat room, and from among the group chat room members, it may be determined which members are able to participate in a group call as group call members. A new group call chat room may be created and include the group call members. The request signal may be transmitted in the created new group call chat room.

Abstract: Disclosed is a method for operating an application providing a group call service using mobile voice over internet protocol (mVoIP). According to one embodiment, a request signal for a group call is received, and regardless of participation in the corresponding the group call, meta information for the group chat room corresponding to the group call can be received from a server. The meta information can comprise at least the group call connection status for each member of the group chat room.

Abstract: Disclosed is a method for operating an application providing a group call service using mobile voice over internet protocol (mVoIP). According to one embodiment, a request signal for a group call is received, and regardless of participation in the corresponding the group call, meta information for the group chat room corresponding to the group call can be received from a server. The meta information can comprise at least the group call connection status for each member of the group chat room.

Abstract: Disclosed is a method for operating an application providing a group call service using mobile voice over internet protocol (mVoIP). According to one embodiment, a request signal for a group call is received, and regardless of participation in the corresponding the group call, meta information for the group chat room corresponding to the group call can be received from a server. The meta information can comprise at least the group call connection status for each member of the group chat room.