In-young Kim

A 90-nm CMOS 1.8-V 2-Gb NAND flash memory for mass storage applications

A 1.8-V 2-Gb NAND flash memory has been successfully developed on a 90-nm CMOS STI process technology, resulting in a 141-mm/sup 2/ die size and a 0.044-/spl mu/m/sup 2/ effective cell. For the higher level integration, critical layers are patterned with KrF photolithography. The device has three notable differences from previous generations. 1) The cells are organized in a single (16K+512) column and 128K row array by adopting a one-sided row decoder in order to minimize the die size. 2) The bitline precharge level is set to 0.9 V in order to increase on-cell current. 3) During the program operations, the string select line, which connects the NAND cell strings to the bitlines, is biased with sub-V/sub CC/ in order to avoid program disturbance issues.

A 1.8 V 2 Gb NAND flash memory for mass storage applications

A 1.8 V 2 Gb NAND flash memory is fabricated in a 90 nm process resulting in a 141 mm/sup 2/ die and a 0.044 /spl mu/m/sup 2/ effective cell. To achieve the high level of integration, critical layers are patterned with KF photolithography and phase-shift masks with proximity correction.

Carbon Dioxide Measurement from Breath Gas Using Blind Source Separation

There are many approaches which use breath gas to diagnose disease such as lung cancer, breast cancer and diabetes. But, it has not been used in medical field because of low accuracy by low concentration of target component (ppt, ppb level). According to previous study, end-tidal concentrations of volatile organic component (VOC) correlated with carbon dioxide (CO2) levels. So, we propose CO2 measurement method from breath gas using blind source separation. To verify feasibility of my approach, we measured 132 samples from 10 persons (Age 22~36, 6 males, 4 females) and calculate standard deviation of measured signal and source signal. At the 0.05 level, the difference of the standard deviations is significantly different (p=0.001). According to this result, it shows our approach is applicable to measure CO2 from mixed breath gas. And, it enables to measure VOC using breath gas.