http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Oh Ig Kwoun,Sang Ho Baek,Hyong Ki Lee,Hong Gyoo Sohn,Uk Han,C. K. Shum 大韓遠隔探査學會 2005 大韓遠隔探査學會誌 Vol.21 No.1
We construct improved geocentric digital elevation model (DEM), estimate tidal dynamics and ice stream velocity over Sulzberger Ice Shelf, West Antarctica employing differential interferograms from 12 ERS tandem mission Synthetic Aperture Radar (SAR) images acquired in austral fall of 1996. Ice, Cloud, and land Elevation Satellite (ICESat) laser altimetry profiles acquired in the same season as the SAR scenes in 2004 are used as ground control points (GCPs) for Interferometric SAR (InSAR) DEM generation. 20 additional ICESat profiles acquired in 2003-2004 are then used to assess the accuracy of the DEM. The vertical accuracy of the DEM is estimated by comparing elevations with laser altimetry data from ICESat. The mean height difference between all ICESat data and DEM is -0.57 m with a standard deviation of 5.88 m. We demonstrate that ICESat elevations can be successfully used as GCPs to improve the accuracy of an InSAR derived DEM. In addition, the magnitude and the direction of tidal changes estimated from interferogram are compared with those predicted tidal differences from four ocean tide models. Tidal deformation measured in InSAR is -16.7 cm and it agrees well within 3 cm with predicted ones from tide models. Lastly, ice surface velocity is estimated by combining speckle matching technique and InSAR line-of-sight measurement. This study shows that the maximum speed and mean speed are 509 m/yr and 131 m/yr, respectively. Our results can be useful for the mass balance study in this area and sea level change.
Grading and Interpretation of White Matter Hyperintensities Using Statistical Maps
Ryu, Wi-Sun,Woo, Sung-Ho,Schellingerhout, Dawid,Chung, Moo K.,Kim, Chi Kyung,Jang, Min Uk,Park, Kyoung-Jong,Hong, Keun-Sik,Jeong, Sang-Wuk,Na, Jeong-Yong,Cho, Ki-Hyun,Kim, Joon-Tae,Kim, Beom Joon,Han, American Heart Association, Inc. 2014 Stroke Vol.45 No.12
<P><B>Background and Purpose—</B></P><P>We aimed to generate rigorous graphical and statistical reference data based on volumetric measurements for assessing the relative severity of white matter hyperintensities (WMHs) in patients with stroke.</P><P><B>Methods—</B></P><P>We prospectively mapped WMHs from 2699 patients with first-ever ischemic stroke (mean age=66.8±13.0 years) enrolled consecutively from 11 nationwide stroke centers, from patient (fluid-attenuated-inversion-recovery) MRIs onto a standard brain template set. Using multivariable analyses, we assessed the impact of major (age/hypertension) and minor risk factors on WMH variability.</P><P><B>Results—</B></P><P>We have produced a large reference data library showing the location and quantity of WMHs as topographical frequency-volume maps. This easy-to-use graphical reference data set allows the quantitative estimation of the severity of WMH as a percentile rank score. For all patients (median age=69 years), multivariable analysis showed that age, hypertension, atrial fibrillation, and left ventricular hypertrophy were independently associated with increasing WMH (0–9.4%, median=0.6%, of the measured brain volume). For younger (≤69) hypertensives (n=819), age and left ventricular hypertrophy were positively associated with WMH. For older (≥70) hypertensives (n=944), age and cholesterol had positive relationships with WMH, whereas diabetes mellitus, hyperlipidemia, and atrial fibrillation had negative relationships with WMH. For younger nonhypertensives (n=578), age and diabetes mellitus were positively related to WMH. For older nonhypertensives (n=328), only age was positively associated with WMH.</P><P><B>Conclusions—</B></P><P>We have generated a novel graphical WMH grading (Kim statistical WMH scoring) system, correlated to risk factors and adjusted for age/hypertension. Further studies are required to confirm whether the combined data set allows grading of WMH burden in individual patients and a tailored patient-specific interpretation in ischemic stroke-related clinical practice.</P>
( Byeong-gon Na ),( Gil-chun Park ),( Min-jae Kim ),( Sang-hoon Kim ),( Yong-kyu Chung ),( Sang-hyun Kang ),( I-ji Jeong ),( Jin-uk Choi ),( Hwui-dong Cho ),( Young-in Yoon ),( Shin Hwang ),( Ki-hun K 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: When the donor’s left lobe volume is <30%, donor selection for the right posterior section graft (RPSG) is based on the type III portal vein (PV) anatomical variation. Herein, we validated the selection of a donor with a type III PV variation for RPSG to prevent biliary complications (BCs) after single-graft (SG) and dual-graft (DG) living-donor liver transplantation (LDLT). Methods: The clinical data of recipients and donors with a type III PV variation for LDLT using an RPSG performed between January 2004 and June 2018 were retrospectively collected and analyzed to determine the occurrence of BCs. Results: The 26 LDLTs performed using an RPSG, including 20 DG LDLT cases, accounted for 0.6% of all LDLT cases (n=4,292). BCs developed in 6 recipients (23.0%), including biliary stricture in 4 (15.3%) and bile leakage in 2 (7.6%). No vascular complications occurred. The RPSG volume was significantly smaller in recipients with BCs than in those without BCs (400.8±79.9 vs. 504.1±96.5 ml, P=0.015). The bile duct types were A, B, C1, C2, and D in 6 (18.8%), 5 (15.6%), 3 (9.4%), 13 (40.6%), and 5 patients (15.6%), respectively. All the RPSGs had a single-orifice bile duct. The bile duct size of the RPSG was relatively smaller in recipients with BCs than in those without BCs (2.8±1.0 vs. 3.6±1.4 mm, P=0.237). Conclusions: When using an RPSG for SG and DG LDLTs, the selection of a donor with a type III PV variation can be feasible to prevent BCs.
( Yong Il Hwang ),( Kwang Ha Yoo ),( Seung Soo Sheen ),( Joo Hun Park ),( Sang-Ha Kim ),( Ho Il Yoon ),( Sung Chul Lim ),( Shin Yup Lee ),( Jae Yong Park ),( Seoung Ju Park ),( Ki Hyun Seo ),( Ki Uk K 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.71 No.5
Background: Chronic obstructive pulmonary disease (COPD) is a major cause of chronic morbidity and mortality throughout the world and is the only major disease that is continuing to increase in both prevalence and mortality. The second Korean National Health and Nutrition Survey revealed that the prevalence of COPD in Korean subjects aged ≥45 years was 17.2% in 2001. Further surveys on the prevalence of COPD were not available until 2007. Here, we report the prevalence of spirometrically detected COPD in Korea, using data from the fourth Korean National Health and Nutrition Survey (KNHANES IV) which was conducted in 2007∼2009. Methods: Based on the Korean Statistical Office census that used nationwide stratified random sampling, 10,523 subjects aged ≥40 years underwent spirometry. Place of residence, levels of education, income, and smoking status, as well as other results from a COPD survey questionnaire were also assessed. Results: The prevalence of COPD (defined as forced expiratory volume in 1 sec/forced vital capacity <0.7 in subjects aged ≥40 years) was 12.9% (men, 18.7%; women, 7.5%). In total, 96.5% of patients with COPD had mild-to-moderate disease; only 2.5% had been diagnosed by physicians, and only 1.7% had been treated. The independent risk factors for COPD were smoking, advanced age, and male gender. Conclusion: The prevalence of COPD was 12.9% in the KNHANES IV data. Most patients with COPD were undiagnosed and untreated. Based on these results, a strategy for early COPD intervention is warranted in high risk subjects.