Abstract: A system for estimating a real-time renewable energy generation quantity according to an embodiment of the present disclosure includes a site setting unit for setting a benchmarking group based on geographical locations of a plurality of renewable energy generation sites and setting a benchmarking site for each benchmarking group, a site generation quantity calculation unit for calculating a real-time generation quantity prediction value of each of sites except the benchmarking site among the sites included in the benchmarking group by using a preset prediction model based on a real-time generation quantity actual-measurement value of the corresponding benchmarking site, and a total generation quantity estimation unit for estimating a total real-time generation quantity of all the sites by summing the calculated real-time generation quantity prediction values for the respective sites and the real-time generation quantity actual-measurement value of the benchmarking site.

Abstract: The refresh circuit for the SDRAM includes: a control signal input buffer for synchronizing externally inputted signals and a column operation control signal (DQM) with a predetermined clock signal and outputting resultant signals; a command generating unit for generating a first refresh command or a second refresh command by receiving a logic combination signal of the signals supplied from the control signal input buffer in accordance with the column operation control signal; a row activating unit for generating a control signal to activate a row operation in accordance with the first refresh command or the second refresh command; a row activation controlling unit for controlling the row activating unit; an internal address counter for generating a predetermined internal address in accordance with the first refresh command; an external address path for receiving an address of a wordline to be refreshed; a row pre-decoder for receiving the internal address from the internal address counter or the external add