Abstract: A method and an apparatus for real-time analysis of the district heating network is disclosed. According to an embodiment of the present disclosure, a method for analyzing a district heating network including pipes and fluids inside the pipes includes receiving, by a processor, pipe data representing a structure of the pipes; receiving, by the processor, input data on at least one of the physical state of the district heating network and the flow of fluids; calculating, by the processor, data for at least one of the physical state of the district heating network or the flow of fluids using the pipe data and the input data.

Abstract: A method is provided for variably controlling a data read speed in an optical disc drive. The method includes determining whether or not a read command has been issued; if the determining step determines that the read command has been issued, examining additional information associated with the read command; and variably controlling a data read speed for an optical disc according to the additional information.

Abstract: This invention provides method and apparatus for controlling a reproduction speed of an optical disk, which detects the condition of an optical disk and changes the reproduction speed automatically to a pre-determined speed corresponding to the detected disk condition. The method according to this invention comprises the steps of detecting the condition of an optical disk through the characteristics of an RF signal reproduced from the optical disk; adjusting the reproduction speed of the optical disk to a pre-determined speed appropriate for the detected disk condition.