S.-K. Lee

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A radio-frequency tunable atomic magnetometer is developed for detection of nuclear quadrupole resonance ͑NQR͒ from room temperature solids. It has a field sensitivity 0.24 fT/ Hz 1/2 at the 423 kHz 14 N NQR frequency of ammonium nitrate. A potential application of the magnetometer is detection of nitrogen-containing explosives which is difficult with(More)
ENSO is by far the dominant player in global year-to-year climate variability, with worldwide impacts on weather, natural disasters, agriculture, fisheries, and natural ecosystems. Understanding and predicting the future behavior of ENSO is thus central to NOAA's mission and highly relevant to society. Prior studies had shown divergent results for the(More)
Bacillus amyloliquefaciens CH51, an isolate from cheonggukjang, Korean fermented soyfood, secretes several enzymes into culture medium. A gene encoding 19 kDa xylanase was cloned by PCR. Sequencing showed that the gene encoded a glycohydrolase family 11 xylanase and named xynA. xynAHis, xynA with additional codons for his-tag, was overexpressed in(More)
High-permeability magnetic shields generate magnetic field noise that can limit the sensitivity of modern precision measurements. We show that calculations based on the fluctuation-dissipation theorem allow quantitative evaluation of magnetic field noise, either from current or magnetization fluctuations, inside enclosures made of high-permeability(More)
Ready-made building components and joining systems are generally unfit for existing building structures with irregular shapes. Therefore, unplanned and immediate manual work is dominantly practiced as measuring and manufacturing of the customized joining system is not supported. In this respect, by obtaining 3-D shapes of the existing building components(More)
Visualization of maturation of the corpus callosum during childhood and adolescence using T2 relaxometry " , occupancy-dependent functional MRI by tissue suppression. " arterial spin labeling in the assessment of collateral circulation: comparison with digital subtraction angiography. BOLD response and vascular reactivity during visual stimulation in the(More)
Implanting a valve that will reduce left ventricular mass is critical in aortic stenosis. Regression of left ventricular hypertrophy in 46 aortic valve replacement (AVR) patients receiving a St. Jude Medical (SJM) valve was assessed by serial electrocardiographic and echocardiographic studies during the preoperative, immediate, and late postoperative(More)
Balloon angioplasty of ostial left anterior descending coronary artery (LAD) lesions has been associated with a high rate of acute complications and late restenosis. Recently, coronary stenting has been proposed as an effective treatment modality for ostial LAD lesions. To evaluate the effects of stent design on the development of late restenosis, we(More)
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