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Hur, Kyu Yeon,Kim, Soo Hyun,Choi, Min-Ah,Williams, Darren R.,Lee, Yong-ho,Kang, Sang Won,Yadav, Umesh C.S.,Srivastava, Satish K.,Jung, Mankil,Cho, Jin Won,Kim, Sang Geon,Kang, Eun Seok,Lee, Eun Jig,Le Elsevier 2010 Atherosclerosis Vol.211 No.1
<P><B>Abstract</B></P><P>Hyperglycemia-induced oxidative stress is known to play an important role in the development of several diabetic complications, including atherosclerosis. Although a number of antioxidants are available, none have been found to be suitable for regulating the oxidative stress response and enhancing antioxidative defense mechanisms. In this study, we evaluated the effects of magnesium lithospermate B (LAB) against oxidative stress. We also endeavored to identify the target molecule of LAB in vascular smooth muscle cells (VSMCs) and the underlying biochemical pathways related to diabetic atherosclerosis. Modified MTT and transwell assays showed that the increased proliferation and migration of rat aortic VSMCs in culture with high glucose was significantly inhibited by LAB. LAB also attenuated neointimal hyperplasia after balloon catheter injury in diabetic rat carotid arteries. To determine molecular targets of LAB, we studied the effects of LAB on aldose reductase (AR) activity, O-GlcNAcylation, and protein kinase C (PKC) activity in VSMCs under normoglycemic or hyperglycemic conditions and showed the improvement of major biochemical pathways by LAB. Potential involvement of the nuclear factor erythroid 2-related factor-2 (Nrf2) – antioxidant responsive element (ARE)-NAD(P)H: quinone oxidoreductase-1 (NQO1) pathway was assessed using siRNA methods. We found that LAB activates the NQO1 via the Nrf2-ARE pathway, which plays an important role in inhibition of the major molecular mechanisms that lead to vascular damage and the proliferation and migration of VSMCs. Together, these findings demonstrate that the induction of the Nrf2-ARE-NQO1 pathway by LAB could be a new therapeutic strategy to prevent diabetic atherosclerosis.</P>
A study on Iris Recognition using Wavelet Transformation and Nonlinear Function
Hur Jung-Youn,Truong Le Xuan,Lee Sang-Kyu Korean Institute of Intelligent Systems 2005 한국지능시스템학회논문지 Vol.15 No.3
Iris recognition system is the one of the most reliable biometries recognition system. An algorithm is proposed to determine the localized iris from the iris image received from iris input camera in client. For the first step, the algorithm determines the center of pupil. For the second step, the algorithm determines the outer boundary of the iris and the pupillary boundary. The localized iris area is transformed into polar coordinates. After performing three times Wavelet transformation, normalization was done using a sigmoid function. The converting binary process performs normalized value of pixel from 0 to 255 to be binary value, and then the converting binary process is compared pairs of two adjacent pixels. The binary code of the iris is transmitted to the server by the network. In the server, the comparing process compares the binary value of presented iris to the reference value in the database. The process of recognition or rejection is dependent on the value of Hamming Distance. After matching the binary value of presented iris with the database stored in the server, the result is transmitted to the client.
Le Thuy Hoa,Jin Suk Chung,Seung Hyun Hur The Korean Institute of Chemical Engineers 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3
Nitrogen-rich carbon dots (NDots) were synthesized by using uric acid as carbon and nitrogen sources. The as-synthesized NDots showed strong dual emissions at 420 nm and 510 nm with excitation at 350 nm and 460 nm, respectively. The physicochemical analyses such as X-ray photoelectron spectroscopy, Transmission electron microscopy and Fourier transform infrared spectroscopy were used to analyze the chemical, physical and morphological structures of NDots. The as-synthesized NDots exhibited wide linear range (0-100 µM) and very low detection limit (124 nM) in Ag<sup>+</sup> ion sensing. In addition, Ag<sup>+</sup> saturated NDots could be used as an EDTA sensor by the EDTA induced PL recovery.
Fabrication of Novel 2D NiO Nanosheet Branched on 1D-ZnO Nanorod Arrays for Gas Sensor Application
Hoa, Le Thuy,Tien, Huynh Ngoc,Hur, Seung Hyun Hindawi Limited 2014 Journal of nanomaterials Vol.2014 No.-
<P>Fabrication of 3D structures composed of 1D n-type ZnO nanorods (NRs) and 2D p-type NiO nanosheets (NSs) by a low-cost, low-temperature, and large-area scalable hydrothermal process and its use in highly sensitive NO2gas sensors were studied. The p-n heterojunctions formed by NiO-ZnO interfaces as well as large area two-dimensional NiO NSs themselves increased the adsorption of NO2. Moreover, the charge transfer between NiO and ZnO enhanced the responsivity and sensitivity of NO2sensing even at a concentration of 1 ppm. The 30-min NiO NS growth on ZnO NRs in the hybrid sensor showed the highest sensitivity due to the formation of optimum p-n heterojunctions between ZnO NRs and NiO NSs for gas adsorption and carrier transport. Low responsivity toward reducing gases was also observed.</P>
Hoa, Le Thuy,Sun, Kang Gyu,Hur, Seung Hyun Elsevier 2015 Sensors and actuators. B, Chemical Vol.210 No.-
<P><B>Abstract</B></P> <P>Highly sensitive non-enzymatic glucose sensors composed of Pt nanoparticles and a 3D graphene hydrogel (GOH) were fabricated by a one-step hydrothermal synthesis. The Pt nanoparticles acted not only as electrocatalysts to oxidize glucose but also as spacers that prevent the agglomeration of graphene sheets and increase the surface area of GOHs. The Pt/GOH glucose sensor fabricated in the presence of 15mg chloroplatinic acid (HPt) exhibited a surface area of 508m<SUP>2</SUP> g<SUP>−1</SUP> and cyclic voltammetry revealed a glucose sensitivity of 137.4μAmM<SUP>−1</SUP> cm<SUP>−2</SUP>, which is 7-fold higher than the undecorated GOH. An excess of Pt resulted in a decrease in glucose sensitivity due to the loss of surface area and electrocatalytic active area by the agglomeration of Pt particles. Pt/GOH showed good response toward real blood samples and was also not affected by ascorbic acid (AA), uric acid (UA) and dopamine (DA) which are common interfering species.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly sensitive hybrid structured non-enzymatic glucose sensors were fabricated. </LI> <LI> 0D Pt nanoparticles increased the surface area of 3D graphene oxide networks. </LI> <LI> Large surface area and high electrocatalytic activity resulted in high glucose sensitivity. </LI> <LI> Sensors fabricated in this study exhibited excellent anti-interference characteristics. </LI> </UL> </P>
무선 애드 혹 네트워크 환경에서 정삼각형을 이용한 효율적인 브로드캐스팅 프로토콜
허인 ( In Hur ),리트롱덕 ( Trong Duc Le ),추현승 ( Hyunseung Choo ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
브로드캐스팅 프로토콜은 무선 애드 혹 네트워크에서 컨트롤 메시지를 전체 노드에 전송하기 위한 목적으로 널리 사용된다. 전통적인 브로드캐스팅 프로토콜은 모든 노드가 처음 받은 메시지를 재전송하기 때문에 극심한 중복전송과 충돌문제가 발생한다. 이러한 문제를 해결하기 위해 최근에 효율적으로 재전송노드를 줄이기 위한 브로드캐스팅 기법들이 제안되었지만 여전히 다수의 불필요한 재전송이 발생한다. 제안 기법은 1-홉 이웃노드의 위치정보를 이용하여 전파반경에 내접하는 정삼각형의 꼭짓점을 구하고 각 꼭짓점에 가장 가까운 이웃노드를 재전송노드로 선택한다. 우리는 먼저 재전송 노드를 최소화하기 위한 이상적인 모델을 제시하고 이상적인 모델에 근접하기 위한 방법을 설명한다. 시뮬레이션 결과를 통해 제안 기법이 기존의 효율적인 브로드캐스팅 프로토콜보다 성능이 우수하며 재전송 노드수가 lower bound에 근접하는 것을 보여준다.
A study on Iris Recognition using Wavelet Transformation and Nonlinear Function
Jung-Youn Hur,Le Xuan Truong 한국지능시스템학회 2004 한국지능시스템학회 학술발표 논문집 Vol.14 No.2
In todays security industry, personal identification is also based on biometric. Biometric identification is performed basing on the measurement and comparison of physiological and behavioral characteristics, Biometric for recognition includes voice dynamics, signature dynamics, hand geometry, fingerprint, iris, etc. Iris can serve as a kind of living passport or living password. Iris recognition system is the one of the most reliable biometrics recognition system. This is applied to client/server system such as the electronic commerce and electronic banking from stand-alone system or networks, ATMs, etc. A new algorithm using nonlinear function in recognition process is proposed in this paper. An algorithm is proposed to determine the localized iris from the iris image received from iris input camera in client. For the first step, the algorithm determines the center of pupil. For the second step, the algorithm determines the outer boundary of the iris and the pupillary boundary. The localized iris area is transform into polar coordinates. After performing three times Wavelet transformation, normalization was done using sigmoid function. The converting binary process performs normalized value of pixel from 0 to 255 to be binary value, and then the converting binary process is compare pairs of two adjacent pixels. The binary code of the iris is transmitted to the server by the network. In the server, the comparing process compares the server, the comparing process compares the binary value of presented iris to the reference value in the database. Process of recognition or rejection is dependent on the value of Hamming Distance. After matching the binary value of presented iris with the database stored in the server, the result is transmitted to the client.