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Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19
<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>
Prevalence of Clostridium tetani isolated from cattle farms in Korea
Jin Sung Seo(Jin Sung Seo),Young Min Son(Young Min Son),Kwang-Ho Choi(Kwang-Ho Choi),Mi-Hye Hwang(Mi-Hye Hwang),Kichan Lee(Kichan Lee),Bang-Hun Hyun(Bang-Hun Hyun),Young-Ju Lee(Young-Ju Lee),Byeong Ye 한국예방수의학회 2018 한국예방수의학회 학술대회자료집 Vol.2018 No.-
Fatigue Crack Growth and Fracture behavior of Rail Steels
Seo, Jung Won,Kwon, Seok Jin,Lee, Dong Hyeong,Kwon, Sung Tae,Choi, Ha Yong The Korean Society for Railway 2012 International Journal of Railway Vol.5 No.3
Contact fatigue damages on the rail surface, such as head checks and squats are a growing problem. The fatigue cracks forming on the contact surface grow according to load and lubricating conditions and may end up breaking the rail. Rail fracture can be avoided by preventing the cracks from reaching the critical length. Therefore, the crack growth rate needs to be estimated precisely according to the conditions of the track and load to develop a maintenance plan against rail damages. Therefore, it is important to understand the mechanism of cracks initiation and growth on a rail due to repetitive rolling contact. In this study, we have investigated the crack growth behavior on the rail surface by using the twin-disc tests and the finite element analysis.
LC : Type of Hyponatremia and Clinical Implications in Cirrhosis Patients
( Jin Yong Jung ),( Sun Young Yim ),( Hyung Joon Yim ),( Bora Keum ),( Yeon Seok Seo ),( Yoon Tae Jeen ),( Hong Sik Lee ),( Hoon Jai Chun ),( Chang Duck Kim ),( Ho Sang Ryu ),( Soon Ho Um ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background/Aims: Hyponatremia frequently develops in advanced cirrhosis patients. The mechanism of hyponatremia is known as reduced excretion of free water excretion caused by increased vasopressin release. Therefore hyponatremia in cirrhosis is known as hypervolemic dilutional hyponatremia. To evaluate the clinical implication of hyponatremia in cirrhosis, we investigated the incidence and type of hyponatremia in cirrhosis. Methods: Out of 404 cirrhotic patients who visited at Korea University Anam Hospital between 1 January 2005 and 31 December 2007, 303 patients without history of hyponatremia or hepatocellular carcinoma at first visit were included and followed up until 31 August 2012. Hyponatremia was defined by a serum sodium concentration ≤ 135 mmol/L. Clinical data were collected at the time of enrollment and hyponatremia. According to clinical features, hyponatremia was classified as hypervolemic type and nonhypervolemic. Results: The median duration of follow-up was 85.43 months (range 14-92 months). Hypervolemic hyponatremia occurred 266 times in 71 patients. Nonhypervolemic hyponatremia occurred 92 times in 51 patients. The 1-, 4-, and 7-years cumulative incidence of hypervolemic hyponatremia was 8.6%, 16.9%, and 24.3%, and that of nonhypervolemic hyponatremia was 5.0%, 9.6%, 18.5%, respectively. On time-dependent cox regression analysis, hypervolemic hyponatremia was associated with mortality (P<0.001, HR=14.538, 95% CI=6.076-34.784), but nonhypervolemic hyponatremia was not (P=0.434, HR 1.360, 95% CI 0.629-2.941). Conclusions: Nonhypervolemic hyponatremia as well as hypervolemic hyponatremia occurs in a significant number of patients with cirrhosis. However, only hypervolemic type is associated with survival of cirrhotic patients.