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Isolation of a new sapogenin from alibizzia julibrissin
You, Yong-Hyo,Woo, Won-Sick,Park, Jae-Sue,Kang, Sam-Sik The Pharmaceutical Society of Korea 1982 Archives of Pharmacal Research Vol.5 No.2
From the hydrosate of the strong uterotonic active saponin of Albizzia julibrissin a new sapogenin, mechaerinic acid mmethylester together with acacic acid lactone was isolated and characterized.
Estimation of Carrier Frequency Offset for IEEE 802.16 OFDM System
Won-Jae Shin,Eu-Suk Shim,Byoung-Heon Lee,Jae-Hoon Yi,Young-Hwan You 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, algorithms for synchronization of carrier frequency offset (CFO) are presented which use the preamble in OFDM-based 802.16 systems. To demonstrate the efficiency of the proposed scheme, the performance of the proposed CFO estimators is compared to that of conventional method in terms of mean square error (MSE) and acquisition range.
( Jae-hwa Choi ),( Keun-bae Jeong ),( You Hyun Park ),( Iseul Yu ),( Seok Jeong Lee ),( Myoung Kyu Lee ),( Sang-ha Kim ),( Won-yeon Lee ),( Suk Joong Yong ),( Ji-ho Lee ) 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-
Background Inhaled corticosteroids (ICSs) play an important role in lowering the risk of acute exacerbation of chronic obstructive pulmonary disease (COPD). However, ICSs are known to increase the risk of pneumonia. Moreover, previous studies have shown that the incidence rate of pneumonia varies depending on the type of ICS. In this study, the risk of pneumonia according to the type of ICS was investigated in a population-based cohort. Methods A retrospective cohort study was conducted using claims data of the entire population from the Korean National Health Insurance Service. Patients who were newly diagnosed with COPD and prescribed fluticasone or budesonide were enrolled as study subjects. Cumulative and daily doses of ICSs were classified into categorical variables to analyze the risk of pneumonia within identical ICS doses. Results A total of 47,473 subjects were identified and allocated as 14,518 fluticasone and 14,518 budesonide users through 1:1 propensity score matching. Fluticasone users were more likely to develop pneumonia than budesonide users (14.22% vs. 10.66%, p<0.0001). The incidence rate per 100,000 person-years was 2,914.77 for fluticasone users and 2,102.90 for budesonide users. The hazard ratio (HR) of pneumonia in fluticasone compared to budesonide was 1.34 (95% CI 1.26-1.43, p<0.0001). The risk of pneumonia for fluticasone compared to budesonide increased with higher ICS cumulative doses: 1.06 (0.93-1.21), 1.41 (1.19-1.66), 1.41 (1.23-1.63), and 1.49 (1.33-1.66) from the lowest to highest quartiles, respectively. In addition, the risk of pneumonia for fluticasone compared to budesonide was higher as daily ICS doses increased: 1.33 (1.24-1.42) for low doses, 1.51 (1.21-1.89) for medium doses, and 1.72 (1.06-2.78) for high doses. Conclusion ICS types and doses need to be carefully considered during treatment with ICSs in patients with COPD.
Superparamagnetic Behavior of Pt/CoFe/Pt Nanowires With Decreasing Wire Width
Jae-Chul Lee,Kab-Jin Kim,Chang-Won Lee,Young Jin Cho,Sunae Seo,Chun-Yeol You,Kyung-Ho Shin,Sug-Bong Choe IEEE 2009 IEEE transactions on magnetics Vol.45 No.10
<P>We present experimental demonstration that the thermal unstability grows with reducing the width of Pt/CoFe/Pt nanowires on the way to the superparamagnetic transition. The magnetic hysteresis loops measured at room temperature using a magneto-optical Kerr effect system reveal that the coercive field decreases drastically when the nanowire width is reduced smaller than 160 nm. To understand the origin of the coercive field reduction, the coercive field is measured with varying the sweep rate of the external magnetic field and then, analyzed with a thermally-activated magnetization reversal model. It is revealed that the reduction of the coercive field is mainly ascribed to the decrement of the thermal stability parameter, which in turn induces the abrupt reduction of the retention time down to a few seconds.</P>
A scattered pilot synchronization scheme by partial correlation for DVB-H systems
Won-jae Shin,Young-hwan You IEEE 2009 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.55 No.3
<P>This paper presents an improved, scattered pilot synchronization (SPS) scheme in digital video broadcasting-handheld (DVB-H) systems, which detect the pilot pattern of the currently received orthogonal frequency division multiplexing (OFDM) symbol. To reduce the SPS time, and to mitigate the influence of the sampling frequency offset (SFO), the proposed SPS method is based on the conventional correlation-based SPS, and adopts a partial correlation. By using computer simulations, the synchronization performances of the traditional SPS and the new proposed SPS algorithms are evaluated in terms of their probabilities of synchronization failure.</P>