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Seoul, South Korea

Dongguk University is a private, coeducational university in South Korea. It operates campuses in Seoul, Gyeongju City, North Gyeongsang province, and Los Angeles, United States. It operates two affiliated hospitals of Western medicine, and four of Oriental medicine, a generic term which includes traditional Korean medicine studies. Wikipedia.

Keum Y.-S.,Dongguk University
Annals of the New York Academy of Sciences | Year: 2011

The chemopreventive agent sulforaphane is an isothiocyanate derived from cruciferous vegetables. Transcriptional activation of antioxidant response element (ARE)-regulated phase II detoxification and antioxidant genes through the induction of transcription factor NF-E2-related factor-2 (Nrf2) is considered as the prime mechanism of its chemopreventive action. Cellular level of Nrf2 is tightly regulated by proteolysis through Cullin3 (Cul3)/Kelch-like ECH-associated protein 1 (Keap1)-dependent polyubiquitination. Sulforaphane is an electrophile that can react with protein thiols to form thionoacyl adducts and is believed to affect the Cys residues in Keap1 protein. In addition, sulforaphane might affect the activity of a variety of intracellular kinases to phosphorylate Nrf2 proteins, which dictates the nucleocytoplasmic trafficking of Nrf2 or modulates the Nrf2 protein stability. This review is designed to briefly account for the regulatory mechanism of Nrf2 protein expression by Cul3/Keap1 E3 ligase and for the possible roles of posttranslational modifications of cellular Keap1 or Nrf2 proteins by sulforphane in the regulation of ARE-dependent gene activation. © 2011 New York Academy of Sciences.. Source

Baeg K.-J.,Korea Electrotechnology Research Institute | Caironi M.,Italian Institute of Technology | Noh Y.-Y.,Dongguk University
Advanced Materials | Year: 2013

For at least the past ten years printed electronics has promised to revolutionize our daily life by making cost-effective electronic circuits and sensors available through mass production techniques, for their ubiquitous applications in wearable components, rollable and conformable devices, and point-of-care applications. While passive components, such as conductors, resistors and capacitors, had already been fabricated by printing techniques at industrial scale, printing processes have been struggling to meet the requirements for mass-produced electronics and optoelectronics applications despite their great potential. In the case of logic integrated circuits (ICs), which constitute the focus of this Progress Report, the main limitations have been represented by the need of suitable functional inks, mainly high-mobility printable semiconductors and low sintering temperature conducting inks, and evoluted printing tools capable of higher resolution, registration and uniformity than needed in the conventional graphic arts printing sector. Solution-processable polymeric semiconductors are the best candidates to fulfill the requirements for printed logic ICs on flexible substrates, due to their superior processability, ease of tuning of their rheology parameters, and mechanical properties. One of the strongest limitations has been mainly represented by the low charge carrier mobility (μ) achievable with polymeric, organic field-effect transistors (OFETs). However, recently unprecedented values of μ ∼ 10 cm2/Vs have been achieved with solution-processed polymer based OFETs, a value competing with mobilities reported in organic single-crystals and exceeding the performances enabled by amorphous silicon (a-Si). Interestingly these values were achieved thanks to the design and synthesis of donor-acceptor copolymers, showing limited degree of order when processed in thin films and therefore fostering further studies on the reason leading to such improved charge transport properties. Among this class of materials, various polymers can show well balanced electrons and holes mobility, therefore being indicated as ambipolar semiconductors, good environmental stability, and a small band-gap, which simplifies the tuning of charge injection. This opened up the possibility of taking advantage of the superior performances offered by complementary "CMOS-like" logic for the design of digital ICs, easing the scaling down of critical geometrical features, and achieving higher complexity from robust single gates (e.g., inverters) and test circuits (e.g., ring oscillators) to more complete circuits. Here, we review the recent progress in the development of printed ICs based on polymeric semiconductors suitable for large-volume micro- and nano-electronics applications. Particular attention is paid to the strategies proposed in the literature to design and synthesize high mobility polymers and to develop suitable printing tools and techniques to allow for improved patterning capability required for the down-scaling of devices in order to achieve the operation frequencies needed for applications, such as flexible radio-frequency identification (RFID) tags, near-field communication (NFC) devices, ambient electronics, and portable flexible displays. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Choi H.H.,Dongguk University
IEEE Transactions on Fuzzy Systems | Year: 2010

Based on sliding-mode-control theory, we develop a fuzzy controller design method for a class of uncertain time-delay systems that can be represented by TakagiSugeno (TS) fuzzy models. In terms of linear-matrix inequalities (LMIs), we derive a sufficient condition for the existence of stabilizing sliding-mode controllers. We show that the sliding-surface parameter matrix can be characterized in terms of the solution of the LMI-existence condition. Our LMI condition does not require stabilization of the pair of the state and input matrices. Thus, our method can be applied to a broad class of uncertain systems. We also give an LMI-based algorithm to design a switching feedback-control strategy so that a stable sliding motion is induced in finite time. Finally, we give a numerical-design example to show that our method can be better than the previous results. © 2010 IEEE. Source

Are the genetic polymorphisms of the anti-Müllerian hormone (AMH) and anti-Müllerian hormone type II receptor (AMHR2) genes associated with idiopathic primary ovarian insufficiency (POI) in a Korean population? The distribution of the AMH and the AMHR2 polymorphisms in a Korean POI population was not significantly different from controls. AMH plays an important role in regulating both the primordial follicle recruitment and the cyclic selection of the antral follicles. The AMHR2 -482A>G polymorphism was associated with an earlier menopause and nulliparous women with the GG genotype had a 2.6 years earlier onset of menopause compared with the AA genotype women. Therefore, genetic variants in the AMH signal transduction pathway might affect the ovarian function of women. Case-control study. The subjects consisted of 211 idiopathic POI patients and 233 post-menopausal controls. The frequency of the AMH Ile(49)Ser and AMHR2 -482A>G polymorphisms was analyzed in 211 patients with idiopathic POI and in 233 post-menopausal controls, and we also analyzed clinical characteristics, such as age at the time of POI and LH, FSH as well as estradiol levels according to the specific genotype. Genotyping for the AMH Ile(49)Ser and the AMHR2 -482A>G polymorphisms was performed by a minor groove binder primer/probe Taqman assay. The genotype distributions and allele frequencies for the AMH Ile(49)Ser and the AMHR2 -482A>G polymorphisms were similar between the POI patients and the controls. Within POI population, the AMH Ile(49)Ser and the AMHR2 -482A>G polymorphisms were not associated with age at the time of POI and LH, FSH as well as estradiol levels. Haplotype analysis also showed no significant difference between groups. Study is limited to a Korean population. Our findings suggest that genetic variants in the AMH signal transduction pathway may not influence the susceptibility of idiopathic POI. This is the first report on the association between the AMH and AMHR2 polymorphisms and idiopathic POI. No conflict of interest exists. This study was supported by a grant of Seoul National University Hospital Research Fund (04-2011-0870). N/A. Source

Lee C.H.,Dongguk University
Archives of Pharmacal Research | Year: 2012

New classes of lipids such as lipoxins, resolvins, protectins and maresin are found to promote the resolution of inflammation. The resolving actions of these endogenous lipids are mediated by membrane receptors such as lipoxin A4 receptor/formyl peptide receptor 2 (ALX/FPR2) and cysteinyl leukotriene receptor 1 (CysLT1). Further, there exists G protein-coupled receptor 32 (GPR32), chemokine receptor-like (CMLKLR), LTB4 receptor 1 (BLT1) and unidentified high-affinity surface binding receptors in human polymorphonuclear leukocytes (PMN). In particular, RX-10001 (resolvin E1) and RX-10004 (synthetic analog of resolvin, phase II) are being studied clinically in many inflammatory diseases including dry eye, retinal disease, asthma, inflammatory bowel diseases, rheumatic arthritis and cardiovascular diseases by Resolvyx Pharmaceuticals. These novel lipid classes of inflammation resolving mediators might offers new opportunities for candidates of drugs modulating chronic inflammatory diseases. Here, the progress of resolvins as new drug candidates is introduced and research on the resolution phase of inflammation is emphasized. © 2012 The Pharmaceutical Society of Korea and Springer Netherlands. Source

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