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박종호,김지윤,장순호,조영일 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4
정전류 중합법으로 도펀트의 화학적 구조와 크기에 따라 폴리피롤 막을 ITO 전극위에 합성하고 전기화학적 특성을 알아보았다. 전해중합 효율은 SBA, PVS, BDS 순으로 증가하였고 합성 전기량의 증가에 따라서는 변화되지 않았다. SBA를 도펀트로 제조된 폴리피롤 막은 산화 과정에서 음이온 및 양이온 교환특성이 나타남을 CV를 통해 알 수 있었다. 도펀트가 BDS인 폴리피롤 막은 전류밀도 1 mA/㎠에서 가장 높은 속도 상수 값을 나타내었다. 또한 선형분극 법으로 측정한 확산계수는 이중층 용량 성분 때문에 임피던스 법으로 구한 값보다 크게 나타났다. According to chemical structure and size of dopant, the polypyrrole films were prepared by constant current polymerization method on ITO electrode and its electrochemical properties were investigated. The current efficiency of polymerization of pyrrole was increased in the sequence 4-sulfobenzoic acid(SBA), polyvinylsulfonic acid(PVS), 1.3-benzenedis-ulfonic acid(BDS) and was unchanged with electricity of polymerization. As a result of cyclic voltammetry of polypyrrole film prepared with SBA as dopant, ion-exchange behavior both of anion and cation was observed during oxidation process. The maximum rate constant of polypyrrole doped with BDS was obtained at 1 ㎃/㎠. In addition, the diffusion coefficient calculated by linear polarization method was more large than that measured by impedance analysis due to double layer capacitance.
전해중합법에 의한 폴리피롤 전극 제조 및 전기화학적 특성
박종호,김지윤,조영일 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.2
본 연구에서는 도펀트를 달리하여 정전류법으로 폴리피롤 막을 ITO 전극위에 제조하였다. 4단자법으로 전도도를 측정한 결과, BDS를 도핑물질로 하는 폴리피롤 필름의 전도도가 0.3S/㎝로 가장 우수하였다. BDS를 도펀트로 사용한 폴리피롤 제조 조건으로 BDS 농도, 전류 밀도, 전기량에 대한 영향을 고찰하였다. 또한 양이온 교환 특성을 향상시키기위해 BDS를 도펀트로 사용한 폴리피롤 위에 거대 음이온 PVS를 도펀트로 적층 중합한 복합체 필름을 제조하였으며, 양이온에 대한 교환 특성이 향상되는 것을 확인할 수 있었다. In the present study, the polypyrrole films were prepared by constant current method on indium tin oxide electrode with doping materials. From the results of measurements by the four-point probe method, the maximum electrical conductivity of polypyrrole doped with 1, 3-benzenedisulfonic acid(BDS) was 0.3S/㎝. In the case of BDS, the effects of polymerization variable were examined with respect to BDS concentration, current density, and electricity. In order to improve the cation exchange property, the layered polypyrrole composite films were fabricated by electrochemical oxidation of pyrrole in BDS solutions as dopant material followed by electropolymerization in polyvinylsulfonic acid(PVS) solutions. The resulting composite films showed higher redox behaviors for cation transfer than polypyrrole film doped with PVS.
차지윤(Ji-Yun Cha),노영식(Young-Sik Noh),변지웅(Ji-Woong Byun),변영철(Yung-Cheol Byun) 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.2
현재 RFID 기술은 유통, 물류, 이력관리 뿐만 아니라 교통, 방범, 텔레매틱스, u헬스, 등의 다양한 분야에서 서비스를 실현하고 있다. 이에 따라 RFID에 관한 연구와 표준화 작업이 진행되고 있으며, 특히 RFID 리더에서 수집된 데이터들을 효율적으로 관리, 사용하기 위해서 RFID 미들웨어에 대한 요구사항이 증대되고 있다. 본 논문에서는 기존의 ALE 기반 RFID 미들웨어에서 다양한 기능을 확장 할 수 있는 프레임워크를 제안한다. 제안하는 프레임워크는 여러 종류의 태그 데이터를 처리 할 수 있으며, 이기종 다수의 리더들을 동시에 제어하기 위해서 다양한 프로토콜 및 통신방식을 정의한 인터페이스를 제공하여 미들웨어의 기능을 동적으로 확장 할 수 있다.
( Yun Jeong Jeong ),( Hyun Ji Cho ),( Key Whang ),( In Seon Lee ),( Kwan Kyu Park ),( Jung Yoon Choe ),( Sang Mi Han ),( Cheorl Ho Kim ),( Hyeun Wook Chang ),( Sung Kwon Moon ),( Wun Jea Kim ),( Yung 영남대학교 약품개발연구소 2013 영남대학교 약품개발연구소 연구업적집 Vol.23 No.0
Matrix metalloproteinases-9 (MMP-9) plays an important role in the pathogenesis of atherosclerosis and migration of vascular smooth muscle cells (VSMCs) after an arterial injury. In this study, we investigated the potential molecular mechanisms underlying the anti-atheroscleroic effects ofmelittin, a major component of bee venom, in human aortic smooth muscle cells (HASMCs). Melttin significantly suppressed MMP-9 and MMP-2 secretion, as well as TNF-α-induced MMP-9 expression in the HASMCs. In addition, we found that the inhibitory effects of melittin on TNF-α-induced MMP-9 protein expression are associated with the inhibition of MMP-9 transcription levels. Mechanistically, Melittin suppressed TNF-α-induced MMP-9 activity by inhibiting the phosphorylation of p38 and ERK1/2, but did not affect the phosphorylation of JNK and Akt. Reporter gene and western blotting assays showed that melittin inhibits MMP-9 transcriptional activity by blocking the activation of NF-κB via IκBα signaling pathway. Moreover, the matrigel migration assay showed that melittin reduced TNF-α-induced HASMC migration. These results suggest that melittin suppresses TNF-α-induced HASMC migration through the selective inhibition of MMP-9 expression and provide a novel role of melittin in the anti-atherosclerotic action.ⓒ2012Elsevier Ltd. All rights reserved.
물 전기분해용 Pt-SPE 전극촉매의 제조에 관한 연구(1) : 담지시간에 따른 영향 The Effect of Deposition Time
조영일,강문식,김지윤 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.1
고체 고분자 전해질(SPE)로 Nafion 117막을 사용하였으며, 전극물질로는 H₂PtCl_6를, 환원제로는 NaBH₄를 사용하여 물전기분해에 대하여 연구하였다. 담지시간을 매개변수로 제조된 Pt-SPE 복합체의 형태학적 및 전기화학적 특성과 물 전기분해 성능에 미치는 영향을 조사하였다. 물 전기분해 성능에 관한 실험결과 함지시간이 증가함에 따라 조전압은 감소하였으며 60분에서 최소를 나타내었고 그때의 조전압은 전류밀도 1A/㎠, 80℃에서 2.7 V였다. Nafion 117 membrane was used as the solid polymer electrolyte (SPE) and, H₂PtCl_6 and NaBH₄ were used as the electrode material and reducing agent, respectively. The effect of the deposition time was investigated on morphological, electrochemical characteristics and water electrolysis performance of prepared Pt-SPE composite. In water electrolysis performance, the cell voltage decreased as the deposition time increased. At 60 min, the cell voltage showed a minimal value of 2.7 V at a curtent density 1 A/㎠ and 80 ℃.
LPA Receptors: Subtypes and Biological Actions
Choi, Ji Woong,Herr, Deron R.,Noguchi, Kyoko,Yung, Yun C.,Lee, Chang-Wook,Mutoh, Tetsuji,Lin, Mu-En,Teo, Siew T.,Park, Kristine E.,Mosley, Alycia N.,Chun, Jerold Annual Reviews 2010 Annual review of pharmacology and toxicology Vol.50 No.-
Lysophosphatidic acid (LPA) is a small, ubiquitous phospholipid that acts as an extracellular signaling molecule by binding to and activating at least five known G protein??coupled receptors (GPCRs): LPA<SUB>1</SUB>??LPA<SUB>5</SUB>. They are encoded by distinct genes named LPAR1??LPAR5 in humans and Lpar1??Lpar5 in mice. The biological roles of LPA are diverse and include developmental, physiological, and pathophysiological effects. This diversity is mediated by broad and overlapping expression patterns and multiple downstream signaling pathways activated by cognate LPA receptors. Studies using cloned receptors and genetic knockout mice have been instrumental in uncovering the significance of this signaling system, notably involving basic cellular processes as well as multiple organ systems such as the nervous system. This has further provided valuable proof-of-concept data to support LPA receptors and LPA metabolic enzymes as targets for the treatment of medically important diseases that include neuropsychiatric disorders, neuropathic pain, infertility, cardiovascular disease, inflammation, fibrosis, and cancer.