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Ji, Sangyoon,Hyun, Byung Gwan,Kim, Kukjoo,Lee, Sang Yun,Kim, Si-Hoon,Kim, Ju-Young,Song, Myoung Hoon,Park, Jang-Ung Nature Publishing Group 2016 NPG Asia Materials Vol.8 No.-
<P>Substantial progress in flexible or stretchable electronics over the past decade has extensively impacted various technologies such as wearable devices, displays and automotive electronics for smart cars. An important challenge is the reliability of these deformable devices under thermal stress. Different coefficients of thermal expansion (CTE) between plastic substrates and the device components, which include multiple inorganic layers of metals or ceramics, induce thermal stress in the devices during fabrication processes or long-term operations with repetitions of thermal cyclic loading-unloading, leading to device failure and reliability degradation. Here, we report an unconventional approach to form photo-patternable, transparent cellulose nanofiber (CNF) hybrid films as flexible and stretchable substrates to improve device reliability using simultaneous electrospinning and spraying. The electrospun polymeric backbones and sprayed CNF fillers enable the resulting hybrid structure to be photolithographically patternable as a negative photoresist and thermally and mechanically stable, presenting outstanding optical transparency and low CTE. We also formed stretchable origami substrates using the CNF hybrid that are composed of rigid support fixtures and elastomeric joints, exploiting the photo-patternability. A demonstration of transparent organic light-emitting diodes and touchscreen panels on the hybrid film suggests its potential for use in next-generation electronics.</P>
Prevalence of the Metabolic Syndrome among Korean Workers by Occupational Group
Ji Young Ryu,Sukwoo Hong,Chang-Hyo Kim,Sangyoon Lee,Jeong-Ho Kim,Jong-Tae Lee,Dae Hwan Kim 대한직업환경의학회 2013 대한직업환경의학회지 Vol.25 No.-
Objectives: The prevalence of the metabolic syndrome has increased rapidly in South Korea over the past 10 years. However, the occurrence of the metabolic syndrome in workers grouped according to the specific type of work is not well understood in Korea. In this study, we assessed the differences in the prevalence of the metabolic syndrome by occupational group and evaluated the risk of the metabolic syndrome among occupational groups. Methods: From the Fifth Korean National Health and Nutrition Examination Survey (2010), 3,303 employed participants were included in this study. The unadjusted and age-adjusted prevalences of the metabolic syndrome were estimated and multiple logistic regression analysis was conducted using the presence of the metabolic syndrome as a dependent variable, and adjusting for age, education level, household income, drinking behavior, smoking status, physical activity, work hours, and work scheduling pattern. Results: Among male workers, non-manual workers had the greatest age-adjusted prevalence (26.4%, 95% CI: 22.3-30.5%) among the occupational groups. In a logistic regression analysis, male manual workers had a significantly lower odds ratio for the metabolic syndrome relative to non-manual workers (0.59, 95% CI: 0.41-0.85). Conclusion: Our study demonstrated differences in the prevalence of the metabolic syndrome by occupational group and identified the greatest risk for the metabolic syndrome in male non-manual workers.
( Sangyoon Lee ),( Ji Young Ryu ),( Dae-hwan Kim ) 대한결핵 및 호흡기학회 2019 Tuberculosis and Respiratory Diseases Vol.82 No.2
Background: Tuberculosis (TB) is the most important disease screened for upon patient history review during preimmigration medical examinations as performed in South Korea in prospective immigrants to certain Western countries. In 2007, the U.S. Centers for Disease Control and Prevention (CDC) changed the TB screening protocol from a smearbased test to the complete Culture and Directly Observed Therapy Tuberculosis Technical Instructions (CDOT TB TI) for reducing the incidence of TB in foreign-born immigrants. Methods: This study evaluated the effect of the revised (as compared with the old) protocol in South Korea. Results: Of the 40,558 visa applicants, 365 exhibited chest radiographic results suggestive of active or inactive TB, and 351 underwent sputum tests (acid-fast bacilli smear and Mycobacterium tuberculosis culture). To this end, using the CDOT TB TI, 36 subjects (88.8 per 105 of the population) were found to have TB, compared with only seven using the older U.S. CDC technical instruction (TI) (p<0.001). In addition, there were six drug-resistant cases which were identified (16.7 per 105 of the population), two of whom had multidrug-resistance (5.6 per 105 of the population). Conclusion: The culture-based 2007 TI identified a great deal of TB cases current to the individuals tested, as compared to older U.S. CDC TI.
( Sangyoon Chung ),( Ja Seol Koo ),( Kwang Seok Kim ),( Chang Bum Bae ),( Ji Kyoung Lee ),( Joo Hee Park ),( Seung Young Kim ),( Jong Jin Hyun ),( Sung Woo Jung ),( Bora Keum ),( Beom Jae Lee ),( Yoon 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background/Aims: Immunomodulators such as azathioprine (AZA) and 6-mercaptopurine (6-MP) have been used for induction and maintenance treatment of Crohn`s disease (CD) and have effect on decrease of the steroid dose in active CD. The aims of study is to evaluate the predictive factors of response to AZA/6-MP in patients with moderate to severe CD. Methods: Among total 1,499 patients registered on Crohn`s cohort in Korea, 1,382 were enrolled in this study. The medical records including baseline characteristics, location and type of CD, complications, treatment agents, and surgical treatments were reviewed retrospectively. The patients with AZA/6-MP treatments were divided into two groups according to the additional treatments such as biologic agents and/or surgical treatment. Univariate and multivariate analyses were conducted to evaluate the predictive factors of clinical response to immunomodulators. Results: Among 1,382 patients with CD, AZA/6-MP treatment was used in 926 (67.0%). Between two groups according to AZA/6-MP treatment, the treatment group was younger than the other group (mean age, 25.8 vs 32.4, p<.001). AZA/6-MP treatment was used more frequently in patients with ileocolonic CD (62.5% vs 45.4%, p=.007) and with perianal disease (29.5% vs 21.0%, p<.001). In 926 patients with AZA/6-MP treatment, 376 (40.6%) were treated with biologic agents and/or surgical treatment. Between two groups according to the result of AZA/6-MP treatment, the disease locations were significantly different (p=.007), although the disease behaviors were not different. Multivariate analysis revealed that the disease location (p=.003) and age at diagnosis (p=.029) were significantly associated with AZA/6-MP treatment failure. Conclusions: AZA/6-MP treatment is effective on induction and maintenance treatment in CD. However, early biologic treatment should be considered in young age, colonic CD, since their AZA/6-MP treatment is less effective.
하시영,Ji-Young Jung,Youngki Park,Gi-Young Kweon,Sangyoon Lee,Jae-Hyeon Park,양재경 경상국립대학교 농업생명과학연구원 2019 농업생명과학연구 Vol.53 No.5
Environmental conditions are important in increasing the fruit sugar content and productivity of the new cultivar Autumn Sense of Actinidia arguta. We analyzed various soil properties at experimental sites in South Korea. A Pearson’s correlation analysis was performed between the soil properties and sugar content or productivity of Autumn Sense. Further, a decision tree was used to determine the optimal soil conditions. The difference in the fruit size, sugar content, and productivity of Autumn Sense across sites was significant, confirming the effects of soil properties. The decision tree analysis showed that a soil C/N ratio of over 11.49 predicted a sugar content of more than 7°Bx at harvest time, and soil electrical capacity below 131.83 μS/cm predicted productivity more than 50 kg/vine at harvest time. Our results present the soil conditions required to increase the sugar content or productivity of Autumn Sense, a new A. arguta cultivar in South Korea.
Lee, Sangyoon,Ryu, Ji Young,Kim, Dae-Hwan The Korean Academy of Tuberculosis and Respiratory 2019 Tuberculosis and Respiratory Diseases Vol.82 No.2
Background: Tuberculosis (TB) is the most important disease screened for upon patient history review during preimmigration medical examinations as performed in South Korea in prospective immigrants to certain Western countries. In 2007, the U.S. Centers for Disease Control and Prevention (CDC) changed the TB screening protocol from a smear-based test to the complete Culture and Directly Observed Therapy Tuberculosis Technical Instructions (CDOT TB TI) for reducing the incidence of TB in foreign-born immigrants. Methods: This study evaluated the effect of the revised (as compared with the old) protocol in South Korea. Results: Of the 40,558 visa applicants, 365 exhibited chest radiographic results suggestive of active or inactive TB, and 351 underwent sputum tests (acid-fast bacilli smear and Mycobacterium tuberculosis culture). To this end, using the CDOT TB TI, 36 subjects (88.8 per $10^5$ of the population) were found to have TB, compared with only seven using the older U.S. CDC technical instruction (TI) (p<0.001). In addition, there were six drug-resistant cases which were identified (16.7 per $10^5$ of the population), two of whom had multidrug-resistance (5.6 per $10^5$ of the population). Conclusion: The culture-based 2007 TI identified a great deal of TB cases current to the individuals tested, as compared to older U.S. CDC TI.
Lee, Eun Ji,Hur, Jinwoo,Ham, Sun Ah,Jo, Yeonji,Lee, SangYoon,Choi, Mi-Jung,Seo, Han Geuk Elsevier 2017 International journal of biological macromolecules Vol.104 No.1
<P><B>Abstract</B></P> <P>Bioactivities of fish collagen peptide are now being elucidated in diverse biological systems. Here, we investigated the effect of fish collagen peptide on the adipogenic differentiation of 3T3-L1 preadipocytes and in obese mice fed a high fat diet (HFD). Subcritical water-hydrolyzed fish collagen peptide (SWFCP) significantly inhibited lipid accumulation during the differentiation of 3T3-L1 preadipocytes, which was accompanied by decreased expression of CCAAT-enhancer-binding protein-α (C/EBP-α), peroxisome proliferator-activated receptor-γ (PPAR-γ), and adipocyte protein 2 (aP2) genes, key regulators of differentiation and maintenance of adipocytes. SWFCP was also found to suppress the palmitate-induced accumulation of lipid vacuoles in hepatocytes. Oral administration of SWFCP significantly reduced HFD-induced body weight gain without a significant difference in food intake. Consistent with its effects in 3T3-L1 preadipocytes, SWFCP inhibited the expression of C/EBP-α, PPAR-γ, and aP2 in epididymal adipose tissue of mice fed a HFD, leading to a significant reduction in adipocyte size. Furthermore, SWFCP significantly reduced serum levels of total cholesterol, triglyceride, and low-density lipoprotein, and increased serum high-density lipoprotein. These observations suggest that SWFCP inhibits adipocyte differentiation through a mechanism involving transcriptional repression of the major adipogenic regulators C/EBP-α and PPAR-γ, thereby reducing body weight gain and adipogenesis in an animal model of obesity.</P>