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Numerical simulation of solid liquid interface behavior during continuous strip casting process.
Lee, Changbum,Yoon, Wooyoung,Shin, Seungwon,Lee, Jaewoo,Jang, Bo-Yun,Kim, Joonsoo,Ahn, Youngsoo,Lee, Jinseok American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.5
<P>A new metal-strip-casting process called continuous strip-casting (CSC) has been developed for making thin metal strips. A numerical simulation model to help understand solid-liquid interface behavior during CSC has been developed and used to identify the solidification morphologies of the strips and to determine the optimum processing conditions. In this study, we used a modified level contour reconstruction method (LCRM) and the sharp interface method to modify interface tracking, and performed a simulation analysis of the CSC process. The effects of process parameters such as heat-transfer coefficient and extrusion velocity on the behavior of the solid-liquid interface were estimated and used to improve the apparatus. A Sn (Tin) plate of dimensions 200 x 50 x 1 mm3 was successfully produced by CSC for a heat-transfer coefficient of 104 W/m2 K and an extrusion velocity of 0.2 m/s.</P>
Object Tracking in 3-D Space with Passive Acoustic Sensors using Particle Filter
( Jinseok Lee ),( Shung Han Cho ),( Sangjin Hong ),( Jaechan Lim ),( Seong-jun Oh ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.9
This paper considers the object tracking problem in three dimensional (3-D) space when the azimuth and elevation of the object are available from the passive acoustic sensor. The particle filtering technique can be directly applied to estimate the 3-D object location, but we propose to decompose the 3-D particle filter into the three planes` particle filters, which are individually designed for the 2-D bearings-only tracking problems. 2-D bearing information is derived from the azimuth and elevation of the object to be used for the 2-D particle filter. Two estimates of three planes` particle filters are selected based on the characterization of the acoustic sensor operation in a noisy environment. The Cramer-Rao Lower Bound of the proposed 2-D particle filter-based algorithm is derived and compared against the algorithm that is based on the direct 3-D particle filter.
An Ultra-High Input Impedance Analog Front End Using Self-Calibrated Positive Feedback
Lee, Jinseok,Lee, Geon-Hwi,Kim, Hyojun,Cho, SeongHwan IEEE 2018 IEEE journal of solid-state circuits Vol.53 No.8
<P>This paper presents circuit techniques for ultra-high input impedance analog front end (AFE). In order to boost input impedance, various on- and off-chip parasitic capacitances are cancelled using an active shield and negative capacitance technique. To maximize the cancellation, a self-calibration scheme with active shield replica is proposed for positive feedback-based negative capacitance, which settles at the boundary between stable and unstable states in calibration mode. A prototype IC fabricated in 0.18- <TEX>$\mu \text{m}$</TEX> CMOS achieves an input impedance of 50 <TEX>$\text{G}\Omega$</TEX> at 50 Hz, equivalent to 60-fF capacitance, while consuming 289 nW from 0.8-V supply. The proposed AFE is applied to heart-rate monitoring using 1-cm<SUP>2</SUP> dry electrodes over clothes without any straps.</P>