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Investigation of the April 2000 forest fire damage in Kang-won Province, Korea, using RADARSAT data
Kang, Sung Chul,Seo, Jin Won,Lee, Tae Hee,Park, Sang Eun,Hong, Suk Young,Moon, Wooil M. 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1
The series of forest Fires in Kangwon Province in April, 2000, were one of the mast serious ones in the Kang-won Province in recent years. The fire damaged areas are extensive and this paper investigates the utility of the satellite image data, particularly the RADARSAT SAR data. One of the main objectives of this study included evaluation of potential usefulness of the C-band RADARSAT data in the detection of forest fires in mountainous areas. Among several fire damaged sites, the area near Samchuk (city) was selected as the main study area and mufti-temporal RADARSAT(raw) data were acquired and the processed results were comparatively investigated with the IRS-1c data acquired shortly after the fire. To identify the burnt area from the undamaged background in the optical imagery, supervised classification and NDVI processing were carried out and tested with the IRS-1C data. For this experiment, several sets of raw RADARSAT standard and Fine mode (S4, F3, ascending orbit) data were processed and the final image was formed. In addition to the final image, sigma nought (σ°) was catnputed and compared for the burnt area against the undamaged areas. Because of the steep slopes in the study area and subsequent deviation from the flat surface scattering models, the fire scars in the sigma nought (σ°) image were not apparent. However, fire scars are slightly detected in the difference and ratio images obtained from the signal intensity data acquired at different dates (bath before and after fire). Texture analysis of the image data including the burnt areas were carried out using the Multiplicative Markov Random-Field (MMRF) algorithm. The detection of the fire damaged area from both standard mode and fine mode RADARSAT was not as straightforward as in optical data. However, Previous studies with ERS-1 S_AR and RADARSAT data in Indonesia and in the North American Plains indicate that C-band SAR data provide us with an effective tool for studying the forest fire damages. However, the application of C-band SAR data to the analysis of the forest fire areas requires careful processing of the data with realistic scattering models.
( Sang-Cheol Bae ),( Jin-Hye Cha ),( Jung-Yoon Choe ),( Sung Jae Choi ),( Soo-Kyung Cho ),( Won-Tae Chung ),( Chung-Il Joung ),( Young-Ok Jung ),( Young Mo Kang ),( Dong-Wook Kim ),( Jinseok Kim ),( Y 대한류마티스학회 2018 대한류마티스학회지 Vol.25 No.2
Objective. Productivity loss was compared by 3-stage of disease activity and associations between higher disease activity and high productivity loss were identified. Methods. Data were extracted from Rheumatoid Arthritis (RA) Patient-reported Outcomes Research, which enrolled 2,000 RA patients (>20-year) on disease-modifying-antirheumatic-drugs (DMARDs) (≥ 6-month) from December 2012 to June 2013. This included 1,457 RA patients with the disease activity score (DAS-28-ESR) in their medical charts. Productivity loss in time and indirect cost was estimated using The World Health Organization Health and Work Performance Questionnaire (HPQ). Baseline characteristics and productivity loss outcomes were compared according to DAS-28-ESR groups. Results. 84.4% were females, 54.2% had low DAS-28-ESR (<3.2), and 38.2% and 7.6% had moderate (3.2∼5.1) and high DAS-28-ESR (>5.1). Patients with moderate to high DAS-28-ESR had higher lost productivity time (LPT) and monthly costs of LPT than those with low DAS-28-ESR (time in hours: 110.0±58.4 vs. 132.4±57.2 vs. 71.5±52.0, p<0.0001; monthly costs of LPT in 1,000 Korean won: 1,097±607 vs. 1,302±554 vs. 741±531, p<0.0001). Multiple regression analyses revealed significant associations with high LPT in high (adjusted odds ratio [OR]=3.87, 95% confidence interval [CI]: 2.18∼6.87) and moderate DAS-28-ESR (adjusted OR=1.88, 95% CI: 1.41∼2.52) compared to low DAS-28-ESR. In addition, positive associations with high monthly costs of LPT were observed in high (adjusted OR=3.45, 95% CI: 1.98∼5.99) and moderate DAS-28-ESR (adjusted OR=1.93, 95% CI: 1.43∼2.54) compared to low DAS-28-ESR. Conclusion. Timely therapeutic strategies should be taken into consideration given that the RA patients with moderate to high DAS-28-ESR showed strong associations with high productivity loss for effective management of RA. (J Rheum Dis 2018;25:122-130)
Transcriptome analysis of the endangered freshwater pearl bivalve Cristaria plicata
Tae Hun Wang,Bharat Bhusan Patnaik,Se Won Kang,Hee Ju Hwang,So Young Park,Eun Bi Park,Jong Min Chung,Dae Kwon Song,Changmu Kim,Soonok Kim,Jun Sang Lee,Yeon Soo Han,Hong Seog Park,Yong Seok Lee 한국수산과학회 양식분과 2015 한국수산과학회 양식분과 학술대회 Vol.2015 No.10
( Tae Yeop Kim ),( Sung Yeon Won ),( Shin Hye Kang ),( Ur Ryong Cho ) 한국고무학회 2017 엘라스토머 및 콤포지트 Vol.52 No.1
The optimum mixing conditions of silica and silane containing rubber composites were evaluated by investigating the properties of rubber composites prepared with a silica composition of 10, 20, 40, 60, and 80 g, respectively. The crosslinking rate decreased with increasing silica content, with he promoters being adsorbed on the silica surface with in the rubber composite. As a result, the increase in crosslinking time resulted in the destruction of the silica structure. The increase of the bound rubber content due to the destruction of the silica structure inhibited the chain motion of the polymer molecules and reduced the cohesion of the silica itself. Finally, the increase of silica content showed the increase of hardness, tensile strength, and storage modulus of rubber composites.
Kang, Ho Won,Seo, Sung Pil,Kim, Won Tae,Yun, Seok Joong,Lee, Sang-Cheol,Kim, Wun-Jae,Hwang, Eu Chang,Kang, Seok Ho,Hong, Sung-Hoo,Chung, Jinsoo,Kwon, Tae Gyun,Kim, Hyeon Hoe,Kwak, Cheol,Byun, Seok-Soo The Korean Academy of Medical Sciences 2016 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.31 No.12
<P>The prognostic significance of age in renal cell carcinoma (RCC) is a subject of debate. The aim of the present multi-institutional study was to evaluate the impact of age on clinicopathological features and survival in a large cohort of patients with RCC. A total of 5,178 patients who underwent surgery for RCC at eight institutions in Korea between 1999 and 2011 were categorized into three groups according to age at diagnosis as follows: young age (< 40 years, n = 541), middle-age (≥ 40 and < 60 years, n = 2,551), and old age (≥ 60 years, n = 2,096) groups. Clinicopathological variables and survival rates were compared between the three groups. Young patients had lower stage tumors with a low Fuhrman grade, a lower rate of lymphovascular invasion than patients in the other age groups. Regarding histologic type, the young age group had a lower percentage of clear cell histology and a greater incidence of Xp11.2 translocation RCC. Kaplan-Meier estimates showed that cancer-specific survival was significantly better in the young age group than in the other groups (log rank test, <I>P</I> = 0.008). However, age at diagnosis was not an independent predictor of survival in multivariate analysis. In conclusion, young age at diagnosis was associated with favorable pathologic features, although it was not an independent prognostic factor for survival in patients with surgically-treated RCC. Age itself should not be regarded as a crucial determinant for the treatment of RCC.</P>
Transcriptome analysis of the endangered freshwater pearl bivalve Cristaria plicata
Tae Hun Wang,Bharat Bhusan Patnaik,Se Won Kang,Hee Ju Hwang,So Young Park,Eun Bi Park,Jong Min Chung,Dae Kwon Song,Changmu Kim,Soonok Kim,Jun Sang Lee,Yeon Soo Han,Hong Seog Park,Yong Seok Lee 한국수산해양기술학회(구 한국어업기술학회) 2015 한국수산해양기술학회 학술발표대회 Vol.2015 No.10
Kang, Ho-Won,Yoon, Hyung-Yoon,Ha, Yun-Sok,Kim, Won Tae,Kim, Yong-June,Yun, Seok-Joong,Lee, Sang-Cheol,Kim, Wun-Jae 대한비뇨기과학회 2012 Investigative and Clinical Urology Vol.53 No.9
<P><B>Purpose</B></P><P>To validate whether <I>FAM70B</I>, which was found in our micro-array profiling as a prognostic marker for cancer survival, could accurately predict prognosis in patients with muscle-invasive bladder cancer (MIBC).</P><P><B>Materials and Methods</B></P><P>A total of 124 patients with MIBC were enrolled in this study. The <I>FAM70B</I> expression level was analyzed by real-time polymerase chain reaction by using RNA from tumor tissues. The prognostic effect of <I>FAM70B</I> was evaluated by Kaplan-Meier analysis and a multivariate Cox regression model.</P><P><B>Results</B></P><P>Kaplan-Meier estimates showed a significant difference in progression-free survival (log-rank test, p=0.011) and cancer-specific survival (log-rank test, p=0.017) according to <I>FAM70B</I> gene expression level. By multivariate Cox regression analysis, high <I>FAM70B</I> expression was predictive of cancer progression (hazard ratio [HR], 2.115, p=0.013) and cancer-specific death (HR, 1.925; p=0.033). In the subgroup analysis, high expression of <I>FAM70B</I> was associated with poor cancer-specific survival, progression-free survival, and overall survival in the patients who underwent cystectomy (log-rank test, p=0.013, p=0.036, p=0.005, respectively). In the chemotherapy group, <I>FAM70B</I> expression was associated with cancer-specific survival and progression-free survival (log-rank test, p=0.013, p=0.042, respectively). Moreover, high <I>FAM70B</I> expression was associated with shorter cancer-specific survival in localized or locally advanced tumor stages (log-rank test, p=0.016).</P><P><B>Conclusions</B></P><P>We confirmed the significance of <I>FAM70B</I> as a prognostic marker in a validation cohort. Therefore, we propose that the <I>FAM70B</I> gene could be used to more precisely predict cancer progression and cancer-specific death in patients with MIBC.</P>
New Prognostic Model in Hospitalized Patients with Non-Severe Alcoholic Liver Disease
( Tae Hyung Kim ),( Hyung Joon Yim ),( Eileen L. Yoon ),( Seong Hee Kang ),( Hee Yeon Kim ),( Young Chang ),( Sung Won Lee ),( Jeong-Ju Yoo ),( Baek Gyu Jun ),( Jung Gil Park ),( Tae Yeob Kim ),( Do S 대한간학회 2021 춘·추계 학술대회 (KASL) Vol.2021 No.1