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Search Results: 1 - 10 of 34550 matches for " Yubo Zhou? "
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Fake BTS Attacks of GSM System on Software Radio Platform
Yubo Song,Kan Zhou,Xi Chen
Journal of Networks , 2012, DOI: 10.4304/jnw.7.2.275-281
Abstract: The 2G GSM communication system only provides one-way authentication mechanism which just authenticate the identities of mobile users. As we know, this is not resistant to fake BTS attack. But for the huge cost for building a fake BTS before, this kind of attack were not really implemented before. This paper presents an implement of fake BTS based on software radio technologies. Furthermore, this paper discusses two types of fake BTS attacks on our software radio platform. The first attack is IMSI/IMEI catch attack, which can get the mobile phone’s IMSI and IMEI. With this information, attacker can got the track of the man with this phone. The second attack is selective jamming attack. After get the IMSI and IMEI of the mobile phone, the attackers can decide whether the mobile phone is blocked or not. We will analyze the GSM protocol which is relevant to the interception system and later present the performance of such a system by real tests and demonstrate its feasibility.
A Review of Principles of Linguistic Change: Cognitive and Cultural Factors  [PDF]
Yubo Zhang
Open Journal of Modern Linguistics (OJML) , 2014, DOI: 10.4236/ojml.2014.41007

Labov’s Principles of Linguistic Change: Cognitive and Cultural Factors is the third volume of his trilogy, the first two dealing with internal factors and social factors controlling linguistic change. Volume 3 examines the cognitive and cultural factors responsible for linguistic change. The present volume explores into the internal factors discussed in Volume 1, concentrating on the cognitive factors determining the capacity of linguistic system to transmit information. This volume also investigates the social factors considered in Volume 2, moving from the inquiry of face-to-face interaction in local communities to a further examination of cultural patterns in a wide range and on a diachronic basis.

3-Methylquinoxaline-2-carboxylic acid 4-oxide monohydrate
Yubo Li,Wenfeng Zhou,Jinli Wang,Haixiang Gao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681002266x
Abstract: In the crystal structure of the title compound, C10H8N2O3·H2O, molecules are linked via intermolecular O—H...O and O—H...N hydrogen bonds into a two-dimensional network.

Shi Yubo,Zhou Zhihao,

自然资源学报 , 1995,
Abstract: According to the characteristics of the shallow ground water system,the authors study the ground water system from the angle of the whole hydrological circle which includes the precipitation, surface water and ground water. A stochastic model is used to generate the input factors and boundary conditions of the model,and empiral expressions are suggested for the estimation of water exchange. The governing equation of the ground water flow is solved on the basis of the Integrated Finite Difference Methed. An example of the medel shows that the results are reasonable.
Screening Method Based on Walking Plantar Impulse for Detecting Musculoskeletal Senescence and Injury
Yifang Fan, Yubo Fan, Zhiyu Li, Tony Newman, Changsheng Lv, Yi Zhou
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0083839
Abstract: No consensus has been reached on how musculoskeletal system injuries or aging can be explained by a walking plantar impulse. We standardize the plantar impulse by defining a principal axis of plantar impulse. Based upon this standardized plantar impulse, two indexes are presented: plantar pressure record time series and plantar-impulse distribution along the principal axis of plantar impulse. These indexes are applied to analyze the plantar impulse collected by plantar pressure plates from three sources: Achilles tendon ruptures; elderly people (ages 62–71); and young people (ages 19–23). Our findings reveal that plantar impulse distribution curves for Achilles tendon ruptures change irregularly with subjects’ walking speed changes. When comparing distribution curves of the young, we see a significant difference in the elderly subjects’ phalanges plantar pressure record time series. This verifies our hypothesis that a plantar impulse can function as a means to assess and evaluate musculoskeletal system injuries and aging.
Turbulence Mitigation Scheme for Optical Communications using Orbital Angular Momentum Multiplexing Based on Channel Coding and Wavefront Correction
Shengmei Zhao,Bei Wang,Li Zhou,Longyan Gong,Wenwen Cheng,Yubo Sheng,Baoyu Zheng
Physics , 2014,
Abstract: The free-space optical (FSO) communication links with orbital angular momentum (OAM) multiplexing have been demonstrated that they can largely enhance the systems' capacity without a corresponding increase in spectral bandwidth, but the performance of the system is unavoidably disturbed by atmospheric turbulence (AT). Different from the existed AT disturbance, the OAM-multiplexed systems will cause both the burst and random errors for a single OAM state carrier and the `crosstalk' interference between the different OAM states carriers. In this paper, we propose a turbulence mitigation method to improve AT tolerance of OAM-multiplexed FSO communication links. In the proposed scheme, we use channel codes to correct the burst and random errors caused by AT for a single OAM state carrier; And we use wavefront correction method to correct the `crosstalk' interference between the different OAM states carriers. The improvements of AT tolerance are discussed by comparing the performance of OAM-multiplexed FSO communication links with or without channel coding or Shark-Hartmann wavefront correction method. The numerical simulation results show that the OAM-multiplexed FSO communication links have enhanced their AT tolerance. The usage of channel codes and wavefront correction methods together has improved greatly the performance of OAM-multiplexed FSO communication links over atmospheric turbulence.
Multi-Domain Parallel Computing for Strength Analysis of Whole Aircraft Model  [PDF]
Xiuhua Chen, Hai Wang, Yubo Ding
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.49063
Abstract: In the Windows XP 64 bit operating system environment, several common PC were used to build a cluster system, establishing the distributed memory parallel (DMP) computing system. A finite element model of whole aircraft with about 260 million degrees of freedom (DOF) was developed using three-node and four-node thin shell element and two-node beam element. With the large commercial finite element software MSC.MARC and employing two kinds of domain decomposition method (DDM) respectively, realized the parallel solving for the static strength analysis of the whole aircraft model, which offered a high cost-effective solution for solving large-scale and complex finite element models.
Comparison among Chargers of Electric Vehicle Based on Different Control Strategies  [PDF]
Pengxin Hou, Chunlin Guo, Yubo Fan
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B265

The charger of electric vehicle is a power electronic device which consists of rectifying devices and DC-DC converters. This nonlinear diode rectifier circuit has low power factor and high harmonic content. In order to improve power factor and reduce the harmonic distortion rate of the AC side current, single-phase non-controlled rectifier charger needs to install the active power factor correction device. A piece of power system analysis software which is called PSCAD is used in modeling of an EV charger which contains Boost-APFC. By means of simulation and analysis, differences of APFC characteristics between the hysteresis current control mode and average current control mode which has an influence on the power grid are compared. The consequence of simulation shows that the two control strategies achieve power factor correction and harmonic reduction requirements; Boost type power conversion circuit employs the average current control mode is better, which has following features: relatively faster settling time of the output voltage, relatively smaller overshoot, lower current harmonic distortion rate on AC side, lower switching frequency and better control effect.

Galanin Protects against Nerve Injury after Shear Stress in Primary Cultured Rat Cortical Neurons
Meili Liu, Wei Song, Ping Li, Yan Huang, Xianghui Gong, Gang Zhou, Xiaoling Jia, Lisha Zheng, Yubo Fan
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0063473
Abstract: The neuropeptide galanin and its receptors (GalR) are found to be up-regulated in brains suffering from nerve injury, but the specific role played by galanin remains unclear. This study aimed to explore the neuroprotective role of galanin after shear stress induced nerve injury in the primary cultured cortical neurons of rats. Our results demonstrated that no significant changes in cell death and viability were found after galanin treatment when subjected to a shear stress of 5 dyn/cm2 for 12 h, after increasing magnitude of shear stress to 10 dyn/cm2 for 12 h, cell death was significantly increased, while galanin can inhibit the nerve injury induced by shear stress with 10 dyn/cm2 for 12 h. Moreover, Gal2-11 (an agonist of GalR2/3) could also effectively inhibit shear stress-induced nerve injury of primary cultured cortical neurons in rats. Although GalR2 is involved in the galanin protection mechanism, there was no GalR3 expression in this system. Moreover, galanin increased the excitatory postsynaptic currents (EPSCs), which can effectively inhibit the physiological effects of shear stress. Galanin was also found to inhibit the activation of p53 and Bax, and further reversed the down regulation of Bcl-2 induced by shear stress. Our results strongly demonstrated that galanin plays a neuroprotective role in injured cortical neurons of rats.
Distinct Gene Number-Genome Size Relationships for Eukaryotes and Non-Eukaryotes: Gene Content Estimation for Dinoflagellate Genomes
Yubo Hou, Senjie Lin
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0006978
Abstract: The ability to predict gene content is highly desirable for characterization of not-yet sequenced genomes like those of dinoflagellates. Using data from completely sequenced and annotated genomes from phylogenetically diverse lineages, we investigated the relationship between gene content and genome size using regression analyses. Distinct relationships between log10-transformed protein-coding gene number (Y′) versus log10-transformed genome size (X′, genome size in kbp) were found for eukaryotes and non-eukaryotes. Eukaryotes best fit a logarithmic model, Y′ = ln(-46.200+22.678X′, whereas non-eukaryotes a linear model, Y′ = 0.045+0.977X′, both with high significance (p<0.001, R2>0.91). Total gene number shows similar trends in both groups to their respective protein coding regressions. The distinct correlations reflect lower and decreasing gene-coding percentages as genome size increases in eukaryotes (82%–1%) compared to higher and relatively stable percentages in prokaryotes and viruses (97%–47%). The eukaryotic regression models project that the smallest dinoflagellate genome (3×106 kbp) contains 38,188 protein-coding (40,086 total) genes and the largest (245×106 kbp) 87,688 protein-coding (92,013 total) genes, corresponding to 1.8% and 0.05% gene-coding percentages. These estimates do not likely represent extraordinarily high functional diversity of the encoded proteome but rather highly redundant genomes as evidenced by high gene copy numbers documented for various dinoflagellate species.
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