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Xianhong Meng,Keyu Liu,Zongqi Li,Liankai Sha 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
In this paper, when the core tube structure of the fabricated frame core tube is thin and the horizontal anchorage length of the longitudinal reinforcement on the upper part of the beam is insufficient, when the beam-wall is connected by a sleeve, the seismic performance test of the nodes with different mechanical anchoring measures is carried out. The seismic performance of the anchored reinforced fabricated beam-wall out-of-plane connection node is studied by considering factors such as wall top axial compression, constraints, etc., under the same reinforcement ratio, one cast-in-place specimen and two are prefabricated with different anchoring measures. The effects of different anchoring measures on the energy dissipation capacity, stiffness, ductility and ultimate flexural capacity of the fabricated beam-wall joint under the condition of low-cycle reciprocating load applied to the beam end are studied. The research results show that the anchoring performance of the fabricated specimens with anchor plate measures for anchoring reinforcement has been greatly improved. When the bearing capacity meets the requirements, the stiffness and ductility are also significantly improved compared with other specimens. When the load is controlled, the plastic hinge is formed at the joint of the beam end, and the anti-side movement ability is obviously better than the 90° hook anchoring method. It fully shows that when the horizontal anchoring length is insufficient, the anchoring strengthening measures can improve the force performance of the nodes and avoid the occurrence of pull-off failure.
Canny Optimization Algorithm Based on Improved Anisotropic Diffusion Function Filtering
Zhang Xianhong,Zhang Chunrui 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.7
Image edge detection is an important part of image processing, and the effect of edge detection is also directly affected by image analysis, recognition and understanding. Canny operator is the most commonly used image edge detection operator. However, this operator has some limitations. The traditional Canny operator uses Gaussian filtering which may bring problems such as missing edge information and false edge. Besides, the selection of high and low thresholds of the traditional Canny operator are not accurate, and cannot be carried out by self-adaption. In order to solve these problems, this paper presents an optimized algorithm for Canny operator. In this paper, an improved anisotropic diffusion function is used to filter the image, and the improved filtering not only reduces the noise, but also maintains the edge information of the image. Additionally, this paper has improved the maximum between-class variance method (OTSU) to select the high and low thresholds of Canny operator by self-adaption. The improved algorithm is applied to edge detection of various images, and the results indicated that the improved Canny operator is effective in reducing noise and extracting edge.
Electronic Transport of Lateral PtSi<i>/n/n<sup>+</sup></i>-Si Schottky Diodes
Li, Xianhong,Baek, In-Bok,Lee, Seongjae,Jang, Moongyu American Scientific Publishers 2012 Journal of nanoscience and nanotechnology Vol.12 No.7
<P>We investigated the transport properties of a lateral PtSi/n/n(+)-Si Schottky diode prepared on an n-type silicon-on-insulator (SOI) wafer with a special attention on the bipolar transport and the surface effect. With applying a back-gate bias changing from +18 V to -18 V, the unipolar transport behavior switched over to the bipolar one, where an enhanced surface recombination rate due to a high surface-to-volume ratio produced a current density approximately 3 x 10(3) A/cm2 for 2 V bias through a 40 nm-thick and 18 microm-long nanoribbon. The recombination time was estimated to be approximately 1 micros from independent CV measurements, which is much smaller value than that of a bulk. The local Fermi energy level for electrons at the channel center was monitored by an additional voltage probe during each I(D)-V(D) measurement and it revealed the intricate nature of the bipolar transport manifested by the huge asymmetrical hysteretic behavior on a drain bias cycle which is attributed to the charge storage effect and asymmetrical junction profiles.</P>
Zhang Xianhong,Zhang Chunrui 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.10
GGAC is an improvement based on geodesic active contour model (GAC). GGAC model is a widely used method for image segmentation. But, it will be difficult to achieve satisfactory segmentation results to the texture, uneven structure, edge particles, weak edge and other features of the wood surface image. Therefore, the author proposes a segmentation method that integrates the improved Canny edge detection result integrated into the improved GGAC model redrawing boundary stop function, and uses the improved variational level set method to achieve the numerical solution. The algorithm has reduced the choice sensitivity to the initial contour and enhanced the scalability, which can make the profile curve converge to defect edges more rapidly, avoid the local optimum, and improve segmentation effects of weak edges and uneven image. The results are clearer, more consistent and real-time. It has provided a more effective way to segment the wood surface defects, and broadened the application scope of Canny operator and an improved geodesic active contour model.
Conductivity Enhancement of Silicon Nanowires
고재우,박성주,Xianhong Li,백인복,이성재,장문규 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.12
Current-Voltage (I-V) characteristics for various silicon wires of different length-to-width ratios were numerically calculated by solving the Poisson equation and the current continuity equations for electrons and holes self-consistently. We found that, as the silicon wire becomes thinner or the length-to-width aspect ratio becomes higher, the I-V deviates more from the Ohmic relation: the current density at a certain bias voltage becomes larger. In the case of a 500 nm-long silicon wire with n-type doping of 1?0<SUP>16</SUP> cm<SUP>3</SUP>, for example, the current density of a silicon wire at a bias voltage 2 volts increases near three-fold as a length-to-width ratio of wires increases from 1 to 25. This behavior is attributed to an enhanced field at the source due to the strong stray field configuration near contacts at both ends of a wire as well as a large carrier build-up in the middle. Our result suggests that the classical treatment of nanowire transport with a proper account of the nonuniform field distribution along a wire may partly explain the conductivity enhancement phenomenon often observed in various nanowires and nanotubes.
Size and Surface Modification Effects on the pH Response of Si Nanowire Field-Effect Transistors
Baek, In-Bok,Li, Xianhong,Lee, Seongjae,Ah, Chil Seong,Yang, Jong-Heon,Park, Chan Woo,Kim, Tae-Youb,Sung, Gun Yong American Scientific Publishers 2012 Journal of nanoscience and nanotechnology Vol.12 No.7
<P>We investigated the effects of Si nanowire (SiNW) dimensions and their surface modifications on the pH-dependent electronic transport characteristics of SiNW Electrolyte-insulator-Semiconductor Field-Effect Transistors (EISFETs). The threshold voltages, Vth's, of all devices were extracted from the Id-Vg characteristics with Vg applied to the reference electrode immersed in different pH solutions, and their pH-dependences were analyzed for various devices. We found that our devices produce the systematic pH-dependence of Vth with respect to the SiNW's length and show significant changes in a linear pH region and a pH sensitivity upon the Si surface modifications. Particularly in the case of the APTES-treated surface, the linear variation was observed in the wide region of pH = 2 to approximately 11 with the sensitivity of 54.7 +/- 0.6 mV/pH. Also we compared our data to a theoretical result based on the Gouy-Chapmam-Stern-Graham model and found a reasonable agreement between them.</P>