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Soo-Min Lee,Il-Min Yi,Hae-Kang Jung,Hyunbae Lee,Yong-Ju Kim,Yun-Saing Kim,Byungsub Kim,Jae-Yoon Sim,Hong-June Park IEEE 2014 IEEE journal of solid-state circuits Vol.49 No.11
<P>A low-energy single-ended duobinary transceiver is proposed for the point-to-point DRAM interface with an energy efficiency of 0.56 pJ/bit at 7 Gb/s. The transmitter power is reduced by decreasing the signal swing of transmission channel to 80 mV and replacing the multiplexer and the binary output driver in the transmitter by a duobinary output driver. A trans-impedance amplifier (TIA) is used at the receiver end of transmission channel. The TIA works as a receiver termination and also amplifies the input signal for subsequent processing. Analysis of the feedback loop delay and the nonlinearity of the TIA shows that they do not impose serious problems. The TIA output signal is applied to a duobinary-to-NRZ converter, which is implemented by using a direct feedback 1-tap DFE circuit with a tap-coefficient of 1.0. The reference voltage of the duobinary-to-NRZ converter is calibrated automatically to enable a small-swing signaling. The proposed transceiver chip in a 65 nm CMOS process works at 4.5 Gb/s with a 3' FR4 microstrip line, and at 7 Gb/s with a 0.6' FR4.</P>
Effects of the Counter Ion Valency on the Colloidal Interaction between Two Cylindrical Particles
Inho Lee,Hyunbae Dong,Juyoung Choi,이상엽 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.3
In this study, the effects of counter ion valency of the electrolyte on the colloidal repulsion between two parallel cylindrical particles were investigated. Electrostatic interactions of the cylindrical particles were calculated with the variation of counter ion valency. To calculate the electrical repulsive energy working between these two cylindrical particles, Derjaguin approximation was applied. The electrostatic potential profiles were obtained numerically by solving nonlinear Poission-Boltzmann (P-B) equation and calculating middle point potential and repulsive energy working between interacting surfaces. The electrical potential and repulsive energy were influenced by counter ion valency, Debye length, and surface potential. The potential profile and middle point potential decayed with the counter ion valency due to the promoted shielding of electrical charge. On the while, the repulsive energy increased with the counter ion valency at a short separation distance. These behaviors of electrostatic interaction agreed with previous results on planar or spherical surfaces.
Synthesis of Ag-Mn3O4 core-shell nanorods and Mn3O4 nanotubes from sacrificial Ag nanorod templates.
Dong, Hyunbae,Koh, Eoi Kwan,Lee, Sang-Yup American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.11
<P>Our research focuses on the preparation of Ag-Mn3O4 core-shell nanorods and Mn3O4 nanotubes which have various engineering applications. Hausmannite manganese oxide (Mn3O4) nanotubes were synthesized via a galvanic replacement reaction at mild reaction conditions. The Mn3O4 nanotubes were prepared by solidification of manganese ions on a sacrificial silver nanorod due to the standard reduction potential difference between solid silver and manganese ions. The Mn ions were reduced to solid while the solid Ag rod was oxidized to ions. Ag-Mn3O4 core-shell nanorods and Mn3O4 nanotubes were simply prepared by changing the amount of manganese ions. The Mn3O4 layer in the nanorods and nanotubes had a Hausmannite crystalline structure and showed weak hysteresis of magnetism. This weak magnetism is likely due to the diamagnetic property of silver and multiple magnetic domain of Mn3O4. This simple replacement reaction could be applied to various oxide nanotube fabrications with exact shape control.</P>
전현배(Hyunbae Chun),이인재(Injae Lee) 한국노동연구원 2009 노동정책연구 Vol.9 No.1
기존의 출산율에 관한 대부분의 논의들은 가족구조가 출산율에 영향을 미친다는 암묵적인 전제에 기초하고 있지만, 개인별 자료를 이용하여 이를 엄밀하게 검증한 연구는 이루어지지 않았다. 본고는 한국노동패널 자료(KLIPS)를 이용하여 가족구조와 출산율과의 관계를 실증적으로 규명한다. OLS 추정결과에 의하면 부모와 동거하는 기혼자녀 부부일수록 더 많은 자녀를 출산한 것으로 나타났다. 그러나 OLS 추정치에는 부모와의 동거 결정과 자녀 출산결정은 서로 영향을 주고받을 가능성이 있기 때문에 편의(bias)가 존재할 수 있다. 본고에서는 이러한 가족구조와 출산 사이의 존재할 수 있는 내생성 문제를 통제하기 위해 남편의 출생 순위를 기혼자녀 부부의 부모와의 동거에 대한 도구변수로 사용한다. 도구변수를 사용한 추정 결과에 의하면, 부모와의 동거는 기혼자녀 부부의 출산에 통계적으로 유의한 영향을 미치지 않는 것으로 나타났다. 이러한 실증분석 결과는 부모와의 동거와 출산율 사이에 나타나는 정(+)의 관계가 출산 성향이 높은 기혼자녀 부부가 부모와 동거하게 되는 선별 과정(sorting process)에 의해 발생할 수 있음을 시사한다. Using the 2004 Korean Labor and Income Panel Study (KLIPS), this paper examines the causal effect of intergenerational family structure on the fertility of married children. Our instrumental variable (Ⅳ) estimation results show that coresidence with parents does not have a statistically significant effect on the fertility of married children while OLS estimation results show a significant and positive effect. This implies that higher fertility of married couples living with their parents cannot be explained by childcare services provided by their parents, but by the unobservable attributes of married children.