Korea Advanced Institute of Science and Technology

Seoul National University

Snu Rdb Foundation

Young-June Park

Huen Lee

Do-Youn Kim

Jong-Shin Shin

Jin-Hong Ahn

A memory includes at least one first substrate on which unit memory arrays are disposed as a matrix type, each unit memory array including unit memory cells disposed in an array, a second substrate stacked with the at least one first substrate, the second substrate including a sense amplifier region in which sense amplifiers configured to sense information stored in the unit memory cells are disposed, and a plurality of vertical conduction traces configured to electrically connect the at least one first substrate with the second substrate. The sense amplifier region is disposed in a memory region of the second substrate, wherein the memory region of the second substrate corresponds to the memory region of the first substrate.

Stacked dynamic random access memory

The present invention relates to a method for recovering methane gas by adding a gas mixture containing Nand COgases to natural gas hydrate and reacting them. The method for recovering methane gas from natural gas hydrate of the present invention comprises the step of replacing CHgas in natural gas hydrate with a gas mixture containing Nand COgases by adding the gas mixture to the natural gas hydrate. The method for recovering methane gas of the invention assures a recovery rate of CHgas much higher than prior art method without dissociating natural gas hydrate layer and utilization of flue gas as a gas mixture containing Nand COgases, which makes possible its practical application for the production of natural gas in terms of economy and environmental protection.

Method for recovering methane gas from natural gas hydrate

The present invention is for preventing a charge pump from an unnecessary output voltage loss generated by a threshold voltage of a metal-oxide silicon (MOS) transistor. An apparatus for amplifying an inputted voltage includes an amplifying block including at least two pumping units for amplifying the inputted voltage to generate an output voltage; and at least two pumping capacitors, each coupled between two pumping units for supplying a charge in order to amplifying the output voltage of each pumping unit, wherein the pumping unit has a transferring block for transmitting the inputted voltage; and an activation block for activating the transferring block.

Growing community of inventors

Seoul, South Korea

Young-June Park