Real-Time Location Algorithm of Node Based on Anchor Node

Shen Xibing,Wei Rong,Yang Yi 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.4

For traditional RSS location method has higher requirements of environmental factors, the workload in the design and calibration and operation phase is great and efficiency is lower, so it put forward a kind of wireless sensor network localization algorithm based on online calibration modeling of RSS anchor node. First of all, to filter the anchor nodes with weak signal and large uncertainty by using the standard deviation threshold method, and make on-line modeling on the relationship between the distance of anchor node and the unknown node and received signal strength. Secondly, using the cycle calibration way for real-time correction of the on-line model, then locate the unknown node by using the weighted average method, thus establish adaptive mechanism of the environmental factors to realize the real-time accurate positioning of the node. Finally, through simulation to indicate this method can effectively locate the unknown nodes in wireless sensor network and its precision meets the requirements, algorithm is simple and easy to implement with practical application value.

Enhanced plasticity of twin-roll cast ZK60 magnesium alloy through differential speed rolling

Gong, Xibing,Kang, Suk Bong,Li, Saiyi,Cho, Jae Hyung Elsevier 2009 MATERIALS AND DESIGN Vol.30 No.9

<P><B>Abstract</B></P><P>ZK60 magnesium alloy strips were produced by twin-roll cast (TRC) and then subjected to differential speed rolling (DSR) with a velocity ratio of 1:1.2 and 1:1.5. Microstructures, textures and mechanical properties of the DSR-processed sheets were compared with those of equal speed rolling (ESR) to examine the effects of velocity ratio. The sheets processed by DSR showed significantly higher elongation and slightly lower tensile strength than those of the ESR-processed sheet, which can be attributed to the inclination and weakening of the basal fiber texture. Combining the DSR and TRC techniques is suggested to be an effective way of plasticity enhancement of the magnesium alloys, in additional to apparent advantages in energy saving.</P>

MapReduce Based Remote Sensing Image Retrieval Algorithm

Shen Xibing,Wei Rong,Yang Yi 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.8

The remote sensing images are massively stored, so it is difficult for the traditional single-node mode to meet the real-time requirement for remote sensing image retrieval. In order to improve remote sensing image retrieval efficiency and accuracy, a kind of feature information MapReduce based remote sensing image retrieval algorithm is proposed in this article. Specifically, the color features and the texture features of the remote sensing image are firstly extracted, and then Map function is adopted to calculate the similarity between the remote sensing image to be retrieved and the image in the feature library according to the color features and the texture features, and finally Reduce function is adopted to collect the intermediate results of various node tasks and the remote sensing images are ranked by a descending order according to the similarity in order to obtain the remote sensing image retrieval result. The test result shows that the proposed algorithm can rapidly and accurately retrieve the remote sensing image, thus not only improving the remote sensing image retrieval efficiency, but also improving the remote sensing image retrieval accuracy.

The influence of initial stress on wave propagation and dynamic elastic coefficients

Li, Xibing,Tao, Ming Techno-Press 2015 Geomechanics & engineering Vol.8 No.3

The governing equations of wave propagation in one dimension of elastic continuum materials are investigated by taking the influence of the initial stress into account. After a short review of the theory of elastic wave propagation in a rock mass with an initial stress, results indicate that the initial stress differentially influences P-wave and S-wave propagation. For example, when the initial stress is homogeneous, for the P-wave, the initial stress only affects the magnitude of the elastic coefficients, but for the S-wave, the initial stress not only influences the elastic coefficients but also changes the governing equation of wave propagation. In addition, the P-wave and S-wave velocities were measured for granite samples at a low initial stress state; the results indicate that the seismic velocities increase with the initial stress. The analysis of the previous data of seismic velocities and elastic coefficients in rocks under ultra-high hydrostatic initial stress are also investigated.

A numerical study on the damage of projectile impact on concrete targets

Gang Lu,Xibing Li,Kejin Wang 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.9 No.1

This paper presents the numerical simulation of the rigid 12.6 mm diameter kinetic energy ogive-nosed projectile impact on plain and fiber reinforced concrete (FRC) targets with compressive strengths from 45 to 235 MPa, using a three-dimensional finite element code LS-DYNA. A combined dynamic constitutive model, describing the compressive and tensile damage of concrete, is implemented. A modified Johnson_Holmquist_Cook (MJHC) constitutive relationship and damage model are incorporated to simulate the concrete behavior under compression. A tensile damage model is added to the MJHC model to analyze the dynamic fracture behavior of concrete in tension, due to blast loading. As a consequence, the impact damage in targets made of plain and fiber reinforced concrete with same matrix material under same impact velocities (650 m/s) are obtained. Moreover, the damage distribution of concrete after penetration is procured to compare with the experimental results. Numerical simulations provide a reasonable prediction on concrete damage in both compression and tension.

Drought stress-induced changes of microRNAs in diploid and autotetraploid Paulownia tomentosa

Guoqiang Fan,Xibing Cao,Lin Cao,Minjie Deng,Zhenli Zhao,Suyan Niu,Zhe Wang,Yuanlong Wang 한국유전학회 2017 Genes & Genomics Vol.39 No.1

Drought stress adversely affects plant productivity. Growth and timber production of Paulownia trees are limited under drought stress. Changes in gene expression patterns and miRNA in different ploidy of Paulownia tomentosa have been investigated. However, the responses of P. tomentosa to drought stress at the microRNA (miRNA) level have not been reported so far. To identify miRNA candidates and their target genes involved in the drought stress response in diploid and tetraploid P. tomentosa, four small RNA and four degradome libraries from diploid and autotetraploid P. tomentosa under normal and drought stress conditions were constructed and sequenced. A total of 41 conserved and 90 novel miRNAs were identified. Among these miRNAs, 67 (26 conserved and 41 novel) and 53 (six conserved and 47 novel) were significantly differentially expressed in response to drought stress in diploid and autotetraploid P. tomentosa, respectively. Degradome analysis identified 356 candidate miRNA target genes that encoded proteins with functions that included plant defense, transcriptional regulation, and hormone metabolism. In particular, miR4 and miR156 were identified only in autotetraploid P. tomentosa under drought stress. These results will help us build a foundation for future studies of the biological functions of miRNAmediated gene regulation in P. tomentosa.

Knockdown of the M2 Isoform of Pyruvate Kinase (PKM2) with shRNA Enhances the Effect of Docetaxel in Human NSCLC Cell Lines In Vitro

Tiankui Qiao,Tiankui Qiao,Xibing Zhuang,Wei Chen,Na Xing,Qi Zhang 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.6

Purpose: The aim of our study was to explore the relationships between the M2 isoform of pyruvate kinase (PKM2) and the sensitivityof human non-small cell lung cancer (NSCLC) cells to docetaxel in vitro. Materials and Methods: With the method of plasmid transfection, we silenced the expression of PKM2 successfully in A549 and H460 cells. Western blotting and real-time PCR were applied to detect PKM2 expression at protein and gene levels. Cell viability was examined by CCK8 assay. Cell cycle distribution and apoptosis were examined by flow cytometry. P21 and Bax were detected. Results: Expression of PKM2 mRNA and protein were significantly decreased by shRNA targeting PKM2. Silencing of PKM2 increaseddocetaxel sensitivity of human NSCLC A549 and H460 cells in a collaborative manner, resulting in strong suppression of cell viability. The results of flow cytometric assays suggested that knockdown of PKM2 or docetaxel treatment, whether used singlyor in combination, blocked the cells in the G2/M phase, which is in consistent with the effect of the two on the expression of p21. Cells with PKM2 silencing were more likely to be induced into apoptosis by docetaxel although knockdown of PKM2 alone can’t induce apoptosis significantly, which is in consistent with the effect of the two on Bax expression. Conclusion: The results suggest that PKM2 knockdown could serve as a chemosensitizer to docetaxel in non-small lung cancer cells through targeting PKM2, leading to inhibition of cell viability, increase of cell arrest of G2/M phase and apoptosis.

Data Transmission Scheme of VANET Based on CH Selection and Switch between Clusters

Wei Rong,Shen Xibing,Yang Yi 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.8

A data transmission scheme based on cluster is proposed for data transmission of VANETs. Firstly, the selection scheme of cluster head CH is designed. The optimal CH is selected by calculating the utility function of CCHs, which combines node degree (NOD), available resource and mobile information of CHs and CMs, including the characteristic requirements of different user applications. According to the simulation results, the proposed scheme’s performance can be improved in terms of throughput, data transmission delay, successful transmission rate and overhead.

Urban Real-Time Traffic Monitoring Method Based on the Simplified Network Model

Wei Rong,Shen Xibing,Yang Yi 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.3

In urban real-time traffic monitoring, due to the difficult of delay time acquisition at intersection, complicated calculation model, lead to inaccurate traffic discriminant. Aiming at this problem, it proposed a real-time traffic discriminant method based on the simplified network model. In traffic data collection various types of intersections are abstracted as a node in this method, and the delay time at intersection are included in the pasting time of connected roads, then conduct back-stepping calculated according to different types of nodes at monitoring, obtained the traffic conditions of regular road, rotary road and intersection, thus realize real-time monitoring. Finally, to verify the validity of the method through simulation of urban real-time traffic monitoring results.

Determination of spalling strength of rock by incident waveform

Tao, Ming,Zhao, Huatao,Li, Xibing,Ma, Jialu,Du, Kun,Xie, Xiaofeng Techno-Press 2017 Geomechanics & engineering Vol.12 No.1

An experimental technique for determining the spalling strength of rock-like materials under a high strain rate is developed. It is observed that the spalling strength of a specimen can be determined by only knowing the wavelength, loading peak value and length of the first spallation of an incident wave under a specific loading waveform. Using this method in combination with a split-Hopkinson pressure bar (SHPB) and other experimental devices, the spalling strength of granite specimens under a high strain rate is tested. Comparisons with other experimental results show that the new measuring method can accurately calculate the dynamic tensile strength of rock materials under a high strain rate.