Sungwan Cho

Metabolic syndrome and cancer-related mortality among Korean men and women

BACKGROUND We examined the association between the metabolic syndrome and cancer mortality in Koreans. MATERIALS AND METHODS This study included 42 336 men and 32 168 women aged > or =20 years who took health examination and were followed up for 5.6 years. Mortality data were analyzed according to the metabolic syndrome. RESULTS The relative risk (RR) and 95% confidence interval (CI) of cancer mortality in subjects with metabolic syndrome compared with subjects without metabolic syndrome was 1.41 (1.08-1.84) after adjustment for possible confounding factors. The association is significant only among men [RR 1.52 (1.10-2.10)], but not among women. The RRs and 95% CIs for cancer deaths in subjects with elevated body mass index, blood pressure, fasting glucose, and triglycerides were 1.36 (1.07-1.71), 1.34 (1.07-1.69), 1.45 (1.14-1.86), and 1.60 (1.26-2.02) after mutual adjustment, respectively. Upon increasing the number of metabolic risk factors to 1, 2-3, and 4-5, the RRs and 95% CIs of death from cancer were 1.32 (0.83-1.48), 1.47 (1.10-1.96), and 2.42 (1.25-4.68), respectively, with a graded fashion (P for trend < 0.005). CONCLUSION Our results indicate that metabolic syndrome is a risk factor for cancer-related death in Korean adults. Prevention and management of the metabolic syndrome would be needed to reduce cancer mortality.

Determination of Mechanical Properties of Single-Crystal CdS Nanowires from Dynamic Flexural Measurements of Nanowire Mechanical Resonators

The mechanical properties of hexagonal single-crystal CdS nanowires (NWs) were determined by means of dynamic flexural measurements. CdS NWs were fashioned into freely suspended doubly clamped mechanical resonators with lengths varying from 3 to 20 µm. A high-frequency response (3–8 MHz) and a high quality factor (500–600) were observed at room temperature. Based on the resonant frequency dependence on the length of the resonator, Youngs modulus (~62 GPa) and the internal stress (7–30 MPa) were measured. Furthermore, the CdS NW resonators under the conditions of high strain and tension presented nonlinear mechanical responses.

Erratum to: Branch length similarity entropy-based descriptors for shape representation (Journal of the Korean Physical Society, (2017), 71, 10, (727-732), 10.3938/jkps.71.593)

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Electrical Field Gradient Pumping of Parametric Oscillation in a High-Frequency Nanoelectromechanical Resonator

We report on enhancements in the gain of silicon nitride (SiNx) nanomechanical resonators by parametric amplification using a dielectric gradient force pumping. With this technique, high mechanical quality factors (Q) of over 20,000 at resonant frequency of 6.79 MHz are achieved even at room temperature. By applying a constant electric bias voltage (Vdc), we show the resonant frequency to be dependent on static tension. To periodically modulate the spring constant of the resonator, a parametric pumping signal twice its resonant frequency (2f0) is applied simultaneously with the Vdc, and at room temperature, the phase-sensitive parametric gain is 9.62.