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Traditional Gender Gap in a Modernized Society
Bon Sang Koo 숙명여자대학교 아시아여성연구원 2019 Asian Women Vol.35 No.1
This study examines the gender gap in voter turnout across age groups in Korea. By employing the two concepts of gender gap suggested by Inglehart and Norris (2000), it shows that in comparison with other developed democracies, Korean voter turnout by gender and age group reveals a different pattern, in particular among younger age groups. The district-level analysis of the Seoul Metropolitan area shows that the traditional gender gap in voter turnout was more prevalent in the most developed, modernized district despite the entry of a new generation of female voters with modern attributes. This implies that despite Korea’s recognized status as a modernized country, Korean voters are still influenced by traditional values such as those found in a patriarchal culture and when it comes to elections in particular, young voters are disproportionally influenced.
PERFORMANCE OF THE SRAO 6-METER RADIO TELESCOPE
KOO BON-CHUL,PARK YONG-SUN,HONG SEUNG SOO,YUN HONG-SIK,LEE SANG-GAK,BYUN DO-YOUNG,LEE JUNG-WON,CHOI HAN-KyU,LEE SANG-SUNG,YOON YOUNG-ZOO,KIM KEE-TAE,KANG HYUN WOO,LEE JUNG-EuN The Korean Astronomical Society 2003 Journal of The Korean Astronomical Society Vol.36 No.1
We introduce and describe performance of the 6-meter telescope of Seoul Radio Astronomy Observatory (SRAO). All the softwares and instruments except the antenna structure and its driving system are developed for ourselves. The SIS mixer type receiver resulted in the receiver noise temperature less than 50 K (DSB) over the whole 3-mm radio window. An autocorrelation spectrometer, developed first in Korea, provides maximum 50 MHz band width over 1024 channels. Antenna surface is measured and adjusted using template method and radio holography which resulted in a superb surface accuracy bet-ter than 30${\mu}m$. Accordingly, the aperture and beam efficiences amount to $70\%$ and $75\%$, respectively, largely independent of frequency in the 85 - 115 GHz range. It is also found that telescope pointing errors are less than 10" in both azimuth and elevation and that antenna gain is almost constant against elevation greater than $20^{\circ}$, without adjusting sub-reflector position. The SRAO 6-meter telescope is now fully operational and all these characteristics verify that observations are carried out with high precision and fidelity.
1.55-μm DFB lasers over a wide temperature range for analog application
Koo, Bon-Jo,Song, Han-Wook,Kim, Yong-Kwan,Park, Chil-Sung,Ryu, Han-Gwon,Huh, Kwang-Soo,Park, Seung-Bae,Lhee, Zail,Choe, Hyosin,Lee, Seok,Han, Sang-Kook Wiley Subscription Services, Inc., A Wiley Company 2006 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS - Vol.48 No.2
<P>Strained-layer multiquantum-well distributed-feedback (SL-MQW-DFB) lasers at a wavelength of 1.55 μm operating from −40°C to 85°C without any coolers are demonstrated. The average value of IMD3 at 1.8 GHz and 5 mW operating conditions was −71 dBc, and the RIN at 2 mW was measured as 151 dB/Hz. The uncooled DFB lasers we have developed are very useful for mobile applications. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 273–275, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21325</P>
( Bon San Koo ),( Hye-jin Jeong ),( Chang-nam Son ),( Sang-hyon Kim ),( Hyun Jung Kim ),( Gheun-ho Kim ),( Jae-bum Jun ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.0
Background/Aims: We investigated the distribution of serum uric acid (SUA) levels and estimated the prevalence of hyperuricemia and hypouricemia in the Korean population. Methods: This cross-sectional study used data from the Korean Genome and Epidemiology Study and included 172,970 participants (58,981 men and 113,989 women) aged 40 to 79 years. Hypouricemia and hyperuricemia were defined as SUA level ≤ 2.0 mg/dL and > 7 mg/dL, respectively. The prevalence of hyperuricemia and hypouricemia was evaluated by age and sex. Results: The mean SUA levels were significantly higher in men than in women (5.71 ± 1.27 mg/dL vs. 4.21 ± 0.96 mg/dL, p < 0.001). The mean SUA levels and prevalence of hyperuricemia increased with age in women but not in men. The overall prevalence of hyperuricemia and that in men and women was 50.82, 133.25, and 8.17 per 1,000 persons, respectively; the overall prevalence of hypouricemia and that in men and women was 4.16, 1.10, and 5.75 per 1,000 persons, respectively. The prevalence of hypouricemia in men was similar across all age groups; however, that in women was the highest in the age group of 40 to 49 years and the lowest in the age group of 50 to 59 years. Conclusions: The distribution of SUA levels and prevalence of hyperuricemia and hypouricemia differed according to age and sex. Age and sex should be considered in studies on uric acid-related diseases.
Synthesis and characterisation of polygonal indium tin oxide nanocrystals.
Koo, Bon-Ryul,Park, Byung Kyu,Kim, Chang Yeoul,Oh, Sung-Tag,Ahn, Hyo-Jin American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>Polygon ITO (Sn-doped In2O3) nanocrystals were synthesised via electrospinning, and their morphology, structural properties, and chemical composition were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). To determine the optimum conditions for the fabrication of polygon ITO nanocrystals, calcination temperature after the electrospinning process was controlled at 500 degrees C, 600 degrees C, 700 degrees C, and 800 degrees C, and the amount of PVP polymer was controlled at 4 wt%, 7 wt%, and 10 wt%. For comparison purposes, single In2O3 nanocrystals were also synthesised via electrospinning and calcination. The results show that ITO nanocrystals fabricated at a calcination temperature of 800 degrees C and with 10 wt% of PVP polymer exhibit clear polygon structure with single-crystallinity, which may be explained in terms of the effect of Sn doping in the In2O3 matrix and the oriented aggregation and Oswald ripening growth during the fusion process of ITO nanocrystals.</P>
( Bon San Koo ),( Hye-jin Jeong ),( Chang-nam Son ),( Sang-hyon Kim ),( Gheun-ho Kim ),( Jae-bum Jun ) 대한류마티스학회 2021 대한류마티스학회지 Vol.28 No.4
Objective. Both hypouricemia and hyperuricemia are reportedly associated with reduced kidney function. This study investigated the association between uric acid levels and the risk of reduced renal function in men and women. Methods. We conducted a cross-sectional study using data from a government-funded health examinee cohort of a Korean genome and epidemiological study. A total of 172,970 participants (58,981 men, 113,989 women) aged 40∼79 years were included. A logistic regression test was performed, and the odds ratio (OR) and 95% confidence interval (CI) were calculated to examine the relationship between stratified uric acid levels and the frequency of chronic kidney disease. Results. As the uric acid level increased, the risk of reduced renal function increased. Moreover, for uric acid levels ≤2.0 mg/dL, the risk of reduced renal function was higher than that of the reference group. Among the total, man, and woman groups, a statistically significant association was observed in men (OR 1.71, 95% CI 0.945∼3.111, OR 5.003, 95% CI 1.405∼17.809, and OR 1.377, 95% CI 0.696∼2.724, respectively). Conclusion. The OR of reduced renal function according to uric acid levels formed a J-shaped curve in both genders. (J Rheum Dis 2021;28:225-233)