Disclosed is a temperature- and pH-sensitive hydrogel composed of a poly oligomer only. A technique for joint processing of misaligned reference signals in coordinated multipoint communications is provided. The identifications of the goods and the electronic addresses for the corresponding hangers are associated with each other and stored on a computer database. A symbolic link with an activation number is created in a version control file index to the data file written to the target system. The hard mask pattern may be formed in a stack structure including an amorphous carbon layer and the coating layer.