Search Results - "Chung, Sang K."

Micro mercury trapped ion clock prototypes with 10-14 frequency stability in 1-liter packages by Hoang, Thai M., Chung, Sang K., Le, Thanh, Park, Sehyun, Park, Sung-Jin, Eden, J. Gary, Holland, Christopher, Wang, Hao, Momeni, Omeed, Bradley, Russell, Crane, Scott, Prestage, John D., Yu, Nan

“…Modern communication and navigation systems are increasingly relying on atomic clocks. As timing precision requirements increase, demands for lower SWaP (size,…”
Get full text

Micro mercury trapped ion clock prototypes with 10[Formula: see text] frequency stability in 1-liter packages by Hoang, Thai M, Chung, Sang K, Le, Thanh, Park, Sehyun, Park, Sung-Jin, Eden, J Gary, Holland, Christopher, Wang, Hao, Momeni, Omeed, Bradley, Russell, Crane, Scott, Prestage, John D, Yu, Nan

“…Modern communication and navigation systems are increasingly relying on atomic clocks. As timing precision requirements increase, demands for lower SWaP (size,…”
Get full text

Mercury Ion Clock for a NASA Technology Demonstration Mission by Tjoelker, Robert L., Prestage, John D., Burt, Eric A., Pin Chen, Chong, Yong J., Chung, Sang K., Diener, William, Ely, Todd, Enzer, Daphna G., Mojaradi, Hadi, Okino, Clay, Pauken, Mike, Robison, David, Swenson, Bradford L., Tucker, Blake, Wang, Rabi

“…There are many different atomic frequency standard technologies but only few meet the demanding performance, reliability, size, mass, and power constraints…”
Get full text

Integrated physics package of micromercury trapped ion clock with 10 − 14-level frequency stability by Hoang, Thai M., Chung, Sang K., Le, Thanh, Prestage, John D., Yi, Lin, Tjoelker, Robert L., Park, Sehyun, Park, Sung-Jin, Eden, J. Gary, Holland, Christopher, Yu, Nan

“…Mercury trapped ion clocks have demonstrated great long-term frequency stability and robustness. In this paper, we report a demonstration of an integrated…”
Get full text

Stability Demonstration of a 15-cc Mercury-Ion Vacuum Trap Tube by Hoang, Thai M., Chung, Sang K., Le, Thanh, Prestage, John D., Yi, Lin, Tjoelker, Robert L., Yu, Nan

“…In this paper, we report our recent effort on developing a micro mercury trapped ion atomic clock. In particular, we present preliminary results of a…”
Get full text

Containerless protein crystal growth in rotating levitated drops by Chung, Sang K, Trinh, Eugene H

“…A method for growing protein crystals in a containerless environment using an ultrasonic–electrostatic hybrid levitator is evaluated. In this approach, a…”
Get full text

Development of a Micro Mercury Trapped Ion Clock Prototype Employing a Spindt Cathode Ionization Source by Holland, Christopher E., Prestage, John D., Hoang, Thai M., Chung, Sang K., Le, Thanh M., Park, Sung-Jin, Yu, Nan

“…We have developed a prototype mercury ion clock in a miniature pumpless vacuum quadrupole trap tube employing a Spindt-type field-emitter array (FEA) as an…”
Get full text

Demonstration of a Mercury Trapped Ion Clock Prototype by Hoang, Thai M., Chung, Sang K., Le, Thanh, Prestage, John D., Yi, Lin, Tjoelker, Robert L., Yu, Nan, Park, Sehyun, Park, Sung-Jin, Eden, J. Gary, Holland, Christopher

“…In this work, we report a prototype of micro mercury trapped ion atomic clock. All the clock components have been packaged and demonstrated in a magnetic…”
Get full text

Performance of Micro Mercury Trapped Ion Clock by Hoang, Thai M., Chung, Sang K., Thanh Le, Prestage, John D., Yi, Lin, Tjoelker, Robert I., Yu, Nan

“…Trapped mercury ion is a promising candidate for portable and operational atomic clocks. It operates at the 40.5GHz ground state hyperfine transition of 199Hg…”
Get full text

Micro mercury trapped ion clock prototypes with 10\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{-14}$$\end{document}-14 frequency stability in 1-liter packages by Hoang, Thai M., Chung, Sang K., Le, Thanh, Park, Sehyun, Park, Sung-Jin, Eden, J. Gary, Holland, Christopher, Wang, Hao, Momeni, Omeed, Bradley, Russell, Crane, Scott, Prestage, John D., Yu, Nan

“…Modern communication and navigation systems are increasingly relying on atomic clocks. As timing precision requirements increase, demands for lower SWaP (size,…”
Get full text

Intravertebral vacuum phenomenon in osteoporotic compression fracture: report of 67 cases with quantitative evaluation of intravertebral instability by KIM, Dong-Yun, LEE, Sang-Ho, JEE SOO JANG, CHUNG, Sang K. I, LEE, Ho-Yeon

“…The objectives of this study were to: 1) describe the incidence and clinical features of intravertebral vacuum phenomenon (IVVP) in a relatively large number…”
Get full text

A second-order splitting combined with orthogonal cubic spline collocation method for the Rosenau equation by Manickam, S. Arul Veda, Pani, Amiya K., Chung, Sang K.

“…A second‐order splitting method is applied to a KdV‐like Rosenau equation in one space variable. Then an orthogonal cubic spline collocation procedure is…”
Get full text

Comparison of multifidus muscle atrophy and trunk extension muscle strength. Percutaneous versus open pedicle screw fixation by KIM, Dong-Yun, LEE, Sang-Ho, SANG KI CHUNG, LEE, Ho-Yeon

“…This study was conducted by retrospective case selection and prospective observation of longitudinal changes of the multifidus muscle cross-sectional area and…”
Get full text

The acoustic generation of internal flow and rotation of levitated fluid particles by Trinh, Eugene H., Chung, Sang K.

“…The detailed motions of levitated fluid particles in response to acoustic fields have become a topic of renewed interest because of the potential application…”
Get full text

An ultrasonic-electrostatic hybrid levitator for crystal growth from a solution by Chung, Sang K., Trinh, Eugene H.

“…A novel approach to crystal growth from a solution has been introduced by combining the electrostatic levitation technology with the sample rotation…”
Get full text

Biomechanical Effect of Constraint in Lumbar Total Disc Replacement: A Study With Finite Element Analysis by SANG KI CHUNG, YOUNG EUN KIM, WANG, Kyu-Chang

“…Biomechanical effect of implantation of an artificial disc (AD) was investigated using the nonlinear three-dimensional finite element model of L4-L5. The SB…”
Get full text

The Effect of Spatial Quadrature on the Semidiscrete Finite Element Galerkin Method for a Strongly Damped Wave Equation by Sinha, Rajen K., Pani, Amiya K., Chung, Sang K.

“…The purpose of this article is to study the effect of spatial quadrature on the semidiscrete finite element Galerkin approximations to a linear strongly damped…”
Get full text

Repetitive interrogation of 2-level quantum systems by Prestage, J D, Chung, S K

“…Trapped ion clocks derive information from a reference atomic transition by repetitive interrogations of the same quantum system, either a single ion or…”
Get full text

Progress on small mercury ion clock for space applications by Prestage, J.D., Chung, S.K., Thompson, R.J., MacNeal, P.

“…We have recently completed a breadboard ion-clock physics package based on Hg ions shuttled between a quadrupole and a 16-pole rf trap. With this architecture…”
Get full text

Compact microwave mercury ion clock for space applications by Prestage, J.D., Meirong Tu, Chung, S.K., MacNeal, P.

“…We have recently completed a breadboard ion-clock physics package based on Hg ions shuttled between a quadrupole and a 16-pole rf trap. With this architecture…”
Get full text