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Search Results: 1 - 10 of 14719 matches for " GU Ju "
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Analysis of a metallic nano-rod polarizer using finite-difference-time-domain method
Young-Gu Ju
Physics , 2009, DOI: 10.1166/jnn.2010.2268
Abstract: The polarization behavior of metallic nano-rods has been analyzed by means of the finite-difference-time-domain method. When the average spacing between the nano-rods is less than a half wavelength, the layer reflects the light polarized parallel to the nano-rods, as in a nano-slit. However, when the spacing is larger than a half wavelength, the metallic surface absorbs the light, polarized perpendicular to the rods, leading to a polarization reversal. Multiple layers of nano-rods can make a polarizer with a high extinction ratio and good transmittance.
Evaluation scheme for the design of high power single mode vertical-cavity surface-emitting lasers
Young-Gu Ju
Physics , 2004, DOI: 10.1364/OPEX.12.002542
Abstract: A very simple and efficient evaluation procedure is suggested for the design of high power single mode VCSELs by reviewing the physical mechanisms that governs mode transition and simplifying the computation steps. In addition, the new structures are proposed and tested following the suggested evaluation procedure. As a result, the proposed design exhibits much better stability of the fundamental mode over a current range wider than the conventional one.
Supermolecular Interaction of Ferrocenium with Yeast DNA and Application in Electrochemical Sensing for Hybridization Recognition of Yeast DNA
Huangxian Ju,Baofen Ye,Jiayin Gu
Sensors , 2004, DOI: 10.3390/s40500071
Abstract: The supermolecular interactions of single-stranded yeast DNA (ssDNA) and double-stranded DNA (dsDNA) with ferrocenium (Fc+) both in solution and at the electrode/solution interface were studied with UV spectroscopy and electrochemical method. The interaction of covalently immobilized dsDNA with Fc+ resulted in a change of the electrode behavior from diffusion-controlled to surface-controlled and an increase in the current response of Fc+ reduction, which has been used to develop a novel electrochemical yeast DNA sensor for hybridization recognition of immobilized yeast ssDNA to its complementary ssDNA (cDNA). The adsorption constants of Fc+ on ssDNA and dsDNA modified gold electrode surface were (3.38±0.04)×103 M-1 and (2.02±0.02)×104 M-1, respectively, indicating a higher affinity of dsDNA to Fc+. UV spectra and the influence of ion strength showed that the interaction mode between Fc+ and dsDNA in solution might be a groove binding. The interaction between Fc+ and immobilized DNA was mainly an electrostatic model.
Significant changes in subseries means and variances in an 8000-year precipitation reconstruction from tree rings in the southwestern USA
Jianmin Jiang, Xiangqian Gu,Jianhua Ju
Annales Geophysicae (ANGEO) , 2007,
Abstract: Both algorithms were applied to an 8000-year long time series of annual precipitation that was reconstructed from tree rings in the southwestern USA. One of the algorithms is the scanning t-test, which detects significant changes in subseries means (the first center moments) on various time scales. Another is the scanning F-test, which detects significant changes in subseries variances (the second center moments) on multi-time scales. Firstly, the scanning t-test identified 22 change points in subseries means and partitioned the series into 23 relatively wet, normal or dry episodes. Secondly, the scanning F-test detected 15 change points in subseries variances and divided 16 phases in comparatively steady (with smaller variance) or unsteady (with larger variance) features. Thirdly, the 23 wetness-episodes were characterized as the steady or unsteady situations by jointing the results from the scanning F-test into those from the t-test. Fourthly, the 23 episodes were compared to those in the TIC and δ18O records from cored sediments in the deep basin of the Pyramid Lake in Nevada by using a coherency analysis of the t-test between the precipitation reconstruction and the TIC or δ18O series. Fifthly, the 23 episodes were collaborated with some published papers in related studies. In addition, the 23 episodes were also compared with studies of the global climate change and with documents of climate changes in China during the same periods. As the TIC and δ18O record series are high resolution with unequal sampling intervals between 3 and 14 years, an algorithm in the scanning t-test for dealing with the unequal time intervals was developed in this study.
Generation of a retro-reflected wave by interaction of an evanescent wave with a sub-wavelength structure
Young-Gu Ju,Thomas Milster
Physics , 2013,
Abstract: Numerical calculations were performed to examine the mechanisms for generation of a retro-reflected wave from the interaction of an evanescent wave with a sub-wavelength structure using the finite-difference time-domain (FDTD) method. The simulation shows that an evanescent wave is reflected from the structure at the interface between a high index dielectric material and a low index material. The reflected evanescent wave couples into the upper medium and radiates its energy forming a retro-reflected wave, which appears as a sharp peak near the edge of the structure when imaging the structure in hyper-numerical-aperture solid immersion microscopy. We propose a simple theory and verify it through FDTD calculation under various circumstances in order to explain peculiar features of this phenomenon. Furthermore, we suggest a way to control the reflection of the evanescent wave by taking advantage of the interference of the evanescent wave inside the structure.
Analysis of apigenin in Blumea balsamifera Linn DC. and its inhibitory activity against aldose reductase in rat lens  [PDF]
Dong Gu Lee, So-Youn Mok, Changsun Choi, Eun Ju Cho, Hyun Young Kim, Sanghyun Lee
Journal of Agricultural Chemistry and Environment (JACEN) , 2012, DOI: 10.4236/jacen.2012.11005
Abstract: To investigate the therapeutic potentials of na- tural sources, stepwise polarity fractions of Blumea balsamifera were tested for their ability to inhibit aldose reductase (AR) activity in rat lenses. Of these, the ethyl acetate (EtOAc) fraction exhibited a unique AR inhibitory activity (IC50 value, 0.11 μg/mL). Apigenin was identified from the active EtOAc fraction and exhibited high AR inhibitory activity (IC50 value, 4.03 μM). The content of apigenin was measured in B. balsamifera (0.47 mg/g) by HPLC/UV analysis. Our result suggests that B. balsamifera could be a useful natural source for the development of a novel AR inhibitory agent against diabetic complications.


Definition of the Constraint with Spatial Characters
Shiguang Ju,Yi Gu,Zhu Tang,Weihe Chen
International Journal of Distributed Sensor Networks , 2009, DOI: 10.1080/15501320802540686
Abstract: With the development of the RBAC applications, the spatial characters of those protected data objects have to be considered in many fields. In most cases, the permissions of the same user's access will be changed when the users' location changed. The roles played by the same user may be different since their spatial location is changing and then this user would have the different access authorizations in different spatial locations. Generally speaking, the permissions assigned to users depend on their position in a reference space: users often belong to well-defined categories; objects to which permissions must be granted are located in that space; access control policies must grant some privileges based on the positions of objects/users. Some considerable efforts have been recently devoted to the research of secure spatial database systems which guarantee high security and privacy. Especially the integration of the spatial dimension into RBAC-based models has been the hot topic as a consequence of the growing relevance of geo-spatial information in advanced GIS and mobile applications. In the context of mobile applications, spatial constraints are very important for supporting the definition and maintenance of access control policy. Constraint is an important matter of role-based access control policy. It is enforced on special roles in order to maintain the system security. There is only one constraint specified in the traditional RBAC, which is used to enforce the Separation of Duty (SoD) constraint. In this paper, according to the analysis of the spatial features of those protected spatial data object, combining the necessity of spatial constraints and the non-conflict conditions of spatial constraints with the satisfiability of spatial constraints sets and relevance between the different classes of constraints, the constraints with spatial characters are divided into three different classes: the constraints on spatial region, spatial separation of duty constraint, and constraints on cardinality of spatial role activation. We also present the relationship between the different constraints.
In-situ SEM Observation of Monotonic and Cyclic Deformed Structure in Ti-2A1-2.5Zr Alloy
Zhentao YU,Lian ZHOU,Haichen GU,Ju DENG,

材料科学技术学报 , 2001,
Abstract: The SEM observation in situ of monotonic and cyclic deformed structure in Ti-ZA1-2.5Zr alloy was performed. The regularity of slippage, crack nucleation, propagation and the typical dislocation configuration were also investigated. The twin and twist play an important role in maintaining homogeneous deformation in the final plastic deformation stage.
Algorithms and Technologies for Multispectral,Hyperspectral, and Ultraspectral Imagery Ⅻ
用于多光谱、高光谱和超光谱成像的算法与技术Ⅻ

GU Ju-xing,
顾聚兴

红外 , 2008,
Abstract: 第一部分 一、探测与识别 1.高光谱图像的结构模型中正交子空间投影探测器与匹配滤光片的分析比较(P.Bajorski,美国罗彻斯特理工学院)
Immunogenetic Study in Chinese Population with Ankylosing Spondylitis: Are There Specific Genes Recently Disclosed?
Jiayu Zhai,Ju Rong,Qiuxia Li,Jieruo Gu
Clinical and Developmental Immunology , 2013, DOI: 10.1155/2013/419357
Abstract:
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