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Natural Local Self-Boosting Effect in 3D NAND Flash Memory
Myounggon Kang,Yoon Kim IEEE 2017 IEEE electron device letters Vol.38 No.9
<P>This letter examined the natural local self-boosting effect of an inhibited channel in three-dimensional (3D) NAND flash memory. The inhibited channel in the 3D NAND flash structure can be in the floating state easily, because its channel is not connected directly to its substrate. Despite the application of the global self-boosted program-inhibit scheme, the selected wordline cell is localized automatically during the program pulse application. This phenomenon is analyzed using a computer-aided design simulation, and an analytical model of boosted potential of an inhibited channel in 3D NAND flash memory is proposed.</P>
A Microfluidic Device for Continuous White Blood Cell Separation and Lysis From Whole Blood
Kim, Myounggon,Mo Jung, Seung,Lee, Kyeong‐,Hwan,Jun Kang, Yang,Yang, Sung Blackwell Publishing Inc 2010 Artificial Organs Vol.34 No.11
<P><B>Abstract</B></P><P>A microfluidic device, which is composed of a blood inlet, a cell lysis solution inlet, a bifurcation outlet containing six microchannels, and a white blood cell (WBC)‐lysed solution outlet, is proposed in this study to separate WBCs from whole blood and lyse the WBCs in a continuous and near real‐time fashion. The geometry of the microfluidic device is determined based on the bifurcation law and a cell crossover method. The microflow patterns of blood cells in the microfluidic channels are simulated by computational fluid dynamics. The simulation results agree with the experiment results by considering the reduction of blood viscosity in the microfluidic channels. The performance of the microfluidic device is evaluated by investigating the WBC recovery efficiency and the ratio of spectrophotometric absorbance of the blood sample at 260 to that at 280 nm. The WBC recovery efficiency at the main channel outlet is 97.2%. The measured spectrophotometric absorbance ratio of 1.82 indicates that the separated WBCs are completely lysed, leaving only pure DNA in the WBC‐lysed solution. The continuous cell separation and lysis is completed within only 0.5 s. Therefore, it is concluded that the proposed microfluidic device is promising for separating WBCs from whole blood without any pretreatment and lysing the WBCs in a continuous and near real‐time fashion. The proposed microfluidic device may be applicable to a lab‐on‐a‐chip for blood analysis.</P>
KANG, Myounggon,PARK, Ki-Tae,SONG, Youngsun,LEE, Sungsoo,SONG, Yunheub,LIM, Young-Ho The Institute of Electronics, Information and Comm 2010 IEICE transactions on electronics Vol.93 No.2
<P>A new low voltage operation of high voltage switching technique, which is capable of reducing leakage current by an order of three compared to conventional circuits, has been developed for sub-1.8V low voltage mobile NAND flash memory. In addition, by using the proposed high voltage switch, chip size scaling can be realized due to reduced a minimum required space between the N-wells of selected and unselected blocks for isolation. The proposed scheme is essential to achieve low power operation NAND Flash memory, especially for mobile electronics.</P>
영구자석형 동기전동기의 회전자 위치 추정을 위한 DSCT 진폭추출 알고리즘 성능 분석
김명곤(Myounggon Kim),남성규(Sunggyu Nam),노명규(Myounggyu D. Noh),박영우(Young-Woo Park) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This paper represents DSCT amplitude extraction algorithm for rotor position prediction of permanent magnet synchronous motor. Position of rotor including permanent magnet measured by linear hall sensor. Then hall sensor output result sinusoidal wave. When rotor eccentricity situation, amplitude of sinusoidal wave increase as rotor eccentricity. For this reason, amplitude of sinusoidal wave include radial direction information of rotor and to extract position information be necessary. Through computer simulation, we analyzed a performance of DSCT algorithm as one of amplitude extraction algorithm.
Kim, Myounggon,Kim, Ayoung,Kim, Sohee,Yang, Sung Elsevier 2012 Biosensors & bioelectronics Vol.35 No.1
<P><B>Abstract</B></P> <P>This paper presents an electrical method for measurement of Hematocrit (HCT) using a novel HCT estimation parameter. Particularly in the case of electrical HCT measurements, the measurement error generally increases with changes in the electrical conditions of the plasma such as conductivity and osmolality. This is because the electrical properties of blood are a function not only of HCT, but also of the electrical conditions in the plasma. In an attempt to reduce the measurement errors, we herein propose a novel HCT estimation parameter reflecting the characteristics of both the changes in volume of red blood cells (RBCs) and electrical conditions of plasma, simultaneously. In order to characterize the proposed methods under various electrical conditions of plasma, we prepared twelve blood samples such as four kinds of plasma conditions (hypotonic, isotonic, two kinds of hypertonic conditions) at three different HCT levels. Using linear regression analysis, we confirmed that the proposed parameter was highly correlated with reference HCT (HCT<SUB>ref.</SUB>) values measured by microcentrifugation. Thus, the HCT measurement error was less than 4%, despite considerable variations in the conductivity and osmolality of the plasma at conditions of the HCT<SUB>ref.</SUB> of 20%. Multiple linear regression analysis showed that the proposed HCT estimation parameter also yielded a lower measurement error (1%) than the other parameter previously used for the same purpose. Thus, these preliminary results suggest that proposed method could be used for accurate, fast, easy, and reproducible HCT measurements in medical procedures.</P> <P><B>Highlights</B></P> <P>▸ We propose an electrical measurement method of blood hematocrit (HCT) within a 3D type measurement cell based on a novel parameter. ▸ The proposed parameter is independent of the electrical conditions (conductivity, osmolality) of blood plasma and this method dramatically reduces (<1%) a HCT measurement error compared with the ones previous reported electrical HCT measurement methods (2.5–16.3%). ▸ Thus we believe that the demonstrated method in this paper is promising one for accurate, fast, easy, and reproducible HCT measurements.</P>
Separate Extraction of Gate Resistance Components in RF MOSFETs
Kang, Myounggon,Kang, In Man,Jung, Young Ho,Shin, Hyungcheol Institute of Electrical and Electronics Engineers 2007 IEEE transactions on electron devices Vol.54 No.6
<P> A simple and accurate method is presented for extraction of the gate resistance components of RF MOSFETs. Both the gate electrode resistance and the channel resistance were extracted separately. Also, the gate electrode resistance was separated into an external component and an internal component. The gate electrode resistance was extracted at <SMALL>off</SMALL> state, and the channel resistance was extracted with at <SMALL>on</SMALL> state. The simple extraction methodology is applied to extract parameters from the measured <TEX>$S$</TEX>-parameters of RF MOSFETs that are fabricated with 130-nm CMOS technology. </P>