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Search Results: 1 - 10 of 61115 matches for " Demin Yu "
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A Hierarchical Link Scheme in Multi-Hop VANETs with Delay Analysis for Congestion Scenario  [PDF]
Yuanlin Yu, Demin Li, Guanglin Zhang, Xiaolu Zhang
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.48002
Abstract: Vehicular Ad-Hoc Networks (VANETs) as a part of intelligent transportation systems (ITS) are a new perspective to settle the traffic problem. Because of the high velocity, variational topology and such other characters, the link between VANETs and road side unit (RSU) is unstable. Besides, on account of the high cost of RSU, some places can’t be covered completely which make the Internet accessing difficult and accessing delay long. In this paper, we propose a hierarchical link scheme to help vehicles access the Internet based on delay analysis for congestion scenario. We select some moving accessing help points (AHPs) from vehicles in VANETs. Two different hierarchical schemes under the circumstances of whole road covered or not are proposed. When the RSUs are enough to cover the whole road fully, we propose the inward progressive hierarchical method. When the RSUs are not enough to cover the whole road, we propose the outward extend hierarchical method. According to the delay analysis, we can get the optimal hierarchy number. This hierarchical link scheme can decrease delay and make all vehicles access the Internet with delay guarantee. The simulation results indicate that our proposed hierarchical link scheme in VANETs can decrease the link delay effectively.
Isomorphism and Generating Sets of Subalgebras of the VirasoroAlgebra

YU Demin,

系统科学与数学 , 2008,
Abstract: In this paper, the isomorphisms between subalgebras of the Virasoro algebra are discussed. The generating sets, simplicities and maximal properties of the subalgebras are also studied. In particular, it is obtained that $d_i$ and $d_j$ are the minimal generators if and only if $i$ and $j$ are coprime integers with different sign and with absolute value bigger than 1. Also $g_1\cong g_2$ if and only if ${\rm dim\,}g_1={\rm dim\,}g_2$.
A Class Semi-Simple Lie Algebra

YU Demin,MEI Chaoqun,

系统科学与数学 , 2008,
Abstract: In this paper, a infinite dimensional subalgebra of rank 2 of Witt type Lie algebra is studied. Its homomorphism, isomorphism and kernel are investigated.
Cross-correlation markers in stochastic dynamics of complex systems
O. Yu. Panischev,S. A. Demin,J. Bhattacharya
Physics , 2010, DOI: 10.1016/j.physa.2010.06.026
Abstract: The neuromagnetic activity (magnetoencephalogram, MEG) from healthy human brain and from an epileptic patient against chromatic flickering stimuli has been earlier analyzed on the basis of a memory functions formalism (MFF). Information measures of memory as well as relaxation parameters revealed high individuality and unique features in the neuromagnetic brain responses of each subject. The current paper demonstrates new capabilities of MFF by studying cross-correlations between MEG signals obtained from multiple and distant brain regions. It is shown that the MEG signals of healthy subjects are characterized by well-defined effects of frequency synchronization and at the same time by the domination of low-frequency processes. On the contrary, the MEG of a patient is characterized by a sharp abnormality of frequency synchronization, and also by prevalence of high-frequency quasi-periodic processes. Modification of synchronization effects and dynamics of cross-correlations offer a promising method of detecting pathological abnormalities in brain responses.
Impact of material and energy flow variation-basediron/steel ratio on production cost
Lu Biao, Chen Guang, Chen Demin, Yu Weiping, Ding Yi
- , 2015, DOI: 10.3969/j.issn.1003-7985.2015.03.013
Abstract: This paper establishes a model for the production cost of iron and steel enterprise. The variation rule of the production cost versus the iron/steel ratio for two cases, namely, fixed steel production and a fixed amount of molten iron, is analyzed, and the concept of a steel scrap threshold price is proposed. According to the analysis results, when the steel scrap unit price exceeds the steel scrap threshold price, an increase in the iron/steel ratio can reduce the production cost, and vice versa. When the gap between the steel scrap unit price and the steel scrap threshold price is relatively large, the impact of the iron/steel ratio on the production cost is more prominent. According to the calculation example, when steel production is fixed(284 358 t/month)and the steel scrap unit price is 263.2 yuan/t more than the steel scrap threshold price, an increase of 0.01 in the iron/steel ratio causes a monthly production cost reduction of approximately 750 000 yuan(2.63 yuan/t). When the amount of molten iron is fixed(270 425 t/month)and the steel scrap unit price is 140.7 yuan/t more than the threshold price, an increase of 0.01 in the iron/steel ratio causes a monthly production cost reduction of approximately 430 000 yuan(1.5 yuan/t). The results indicate that iron and steel enterprise should adjust the production strategy in time when the scrap price fluctuates, and then the production cost will be reduced.
Fracture and Damage Behaviors of Concrete in the Fractal Space  [PDF]
Heng Zhang, Demin Wei
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.11006
Abstract: The fracture toughness, the driving force and the fracture energy for an infinite plate with a fractal crack are investigated in the fractal space in this work. The perimeter-area relation is adopted to derive the transforma-tion rule between damage variables in the fractal space and Euclidean space. A plasticity yield criterion is introduced and a damage variable tensor is decomposed into tensile and compressive components to describe the distinct behaviors in tension and compression. A plastic damage constitutive model for concrete in the Euclidean space is developed and generalized to fractal case according to the transformation rule of damage variables. Numerical calculations of the present model with and without fractal are conducted and compared with experimental data to verify the efficiency of this model and show the necessity of considering the fractal effect in the constitutive model of concrete. The structural response and mesh sensitivity of a notched unre-inforced concrete beam under 3-point bending test are theoretical studied and show good agreement with the experimental data.
Proteomics analysis of differentially expressed proteins in chicken trachea and kidney after infection with the highly virulent and attenuated coronavirus infectious bronchitis virus in vivo
Zhongzan Cao, Zongxi Han, Yuhao Shao, Xiaoli Liu, Junfeng Sun, Demin Yu, Xiangang Kong, Shengwang Liu
Proteome Science , 2012, DOI: 10.1186/1477-5956-10-24
Abstract: Fifty-eight differentially expressed proteins were identified. Results demonstrated that some proteins which had functions in cytoskeleton organization, anti-oxidative stress, and stress response, showed different change patterns in abundance from chicken infected with the highly virulent ck/CH/LDL/97I P5 strain and those given the embryo-passaged, attenuated P115 stain. In addition, the dynamic transcriptional alterations of 12 selected proteins were analyzed by the real-time RT-PCR, and western blot analysis confirmed the change in abundance of heat shock proteins (HSP) beta-1, annexin A2, and annexin A5.The proteomic alterations described here may suggest that these changes to protein expression correlate with IBV virus' virulence in chicken, hence provides valuable insights into the interactions of IBV with its host and may also assist with investigations of the pathogenesis of IBV and other coronavirus infections.Coronaviruses (CoVs) are enveloped single-stranded positive sense RNA viruses that belong to the family Coronaviridae in the order Nidovirales. They are able to infect humans as well as other animals, including cows, pigs, mice, and chickens, they generally cause respiratory infection, gastrointestinal, and neurological disorders of varying severity. Infectious bronchitis virus (IBV) was the first coronavirus to be discovered, and is classed among the Gamma coronaviruses on the basis of antigenic and genetic relatedness [1]. It is a major poultry pathogen and is probably endemic in all chicken-raising regions; it has a severe impact on poultry production, causing heavy economic losses. All strains of IBV are capable of infecting a large range of epithelial surfaces of chickens, such as those of the trachea, kidney, oviduct and proventriculus [2].Coronavirus infection has dramatic effects on host cell morphology, transcription and translation patterns, the cell cycle, cytoskeleton, suppression of interferon, and apoptosis pathways. Coronavirus infection
Surface modification of AB(2) and AB(5) hydrogen storage alloy electrodes by the hot-charging treatment

Bo YU,Lian CHEN,Mingfen WEN,Ming TONG,Demin CHEN,Yanwen TIAN,Yuchun ZHAI,

材料科学技术学报 , 2001,
Abstract: The effect of the hot-charging treatment on the performance ofAB2 and AB5 hydrogen storage alloy electrodes was investigated. The result showed that the treatment can markedly improve the voltage plateau ratio (VPR), the high rate discharge ability (HRDA), the diffusion coefficient of hydrogen DH and the discharge capacity of the AB2 hydrogen storage alloy electrode. The SEM analysis showed that the hot-charging treatment brings about a Ni-rich surface due to the dissolution of Zr oxides. It is also very helpful for the improvement of the kinetic properties of AB2 hydrogen storage alloy electrode because the microcracking o.f the surface results in fresh surface. This can be the basic modification treatment for NiMH battery used in electric vehicles (EVs) in the future. But for AB5 type alloys, the treatment has the disadvantage of impairing the comprehensive electrochemical properties, because the surface of the alloy may be corroded during the treatment. The mechanism of the surface modification of the electrode is also proposed.
Non-Markov statistical effects of X-ray emission intensity of the microquasar GRS 1915+105
R. M. Yulmetyev,S. A. Demin,R. M. Khusnutdinov,O. Yu. Panischev,P. H?nggi
Physics , 2007,
Abstract: In this paper we develop the new approach in time series analysis with a variable time step and present the results of quantitative and qualitative estimation of randomness and regularity, and the study of non-Markovian effects of the X-ray emission intensity of the microquasar GRS 1915+105. Our estimation is based on the application of the theory of discrete non-Markovian stochastic processes and gives a wide set of quantitative characteristics and parameters of the studied system with a variable time step. This set reflects the change of the effects of randomness and regularity, the alternation of Markovian and non-Markovian processes in the initial time signals. Initially these characteristics were determined for the simple model systems constructed by means of a molecular dynamics method. Further the calculation of these parameters was executed for the X-ray emission intensity of the microquasar GRS 1915+105. We have developed a theoretical scheme for the detailed analysis of the time series with a variable time step. The new theory allows us to extract more detailed information about the X-ray emission of the microquasar GRS 1915+105 from the experimental time series. The received set of the parameters allows to estimate accurately randomness and stochastic behavior, regularity and robustness, non-Markovian effects of statistical memory in the intensity of the X-ray emission. The analysis of the experimental data with a constant and variable time step is carried out by means of phase portraits, power spectra of the initial time and event correlation function (TCF and ECF), and memory functions (MF) of the junior order, the first three points of non-Markovity parameter.
Analysis of cross-correlations in electroencephalogram signals as an approach to proactive diagnosis of schizophrenia
Serge F. Timashev,Oleg Yu. Panischev,Yuriy S. Polyakov,Sergey A. Demin,Alexander Ya. Kaplan
Physics , 2011, DOI: 10.1016/j.physa.2011.09.032
Abstract: We apply flicker-noise spectroscopy (FNS), a time series analysis method operating on structure functions and power spectrum estimates, to study the clinical electroencephalogram (EEG) signals recorded in children/adolescents (11 to 14 years of age) with diagnosed schizophrenia-spectrum symptoms at the National Center for Psychiatric Health (NCPH) of the Russian Academy of Medical Sciences. The EEG signals for these subjects were compared with the signals for a control sample of chronically depressed children/adolescents. The purpose of the study is to look for diagnostic signs of subjects' susceptibility to schizophrenia in the FNS parameters for specific electrodes and cross-correlations between the signals simultaneously measured at different points on the scalp. Our analysis of EEG signals from scalp-mounted electrodes at locations F3 and F4, which are symmetrically positioned in the left and right frontal areas of cerebral cortex, respectively, demonstrates an essential role of frequency-phase synchronization, a phenomenon representing specific correlations between the characteristic frequencies and phases of excitations in the brain. We introduce quantitative measures of frequency-phase synchronization and systematize the values of FNS parameters for the EEG data. The comparison of our results with the medical diagnoses for 84 subjects performed at NCPH makes it possible to group the EEG signals into 4 categories corresponding to different risk levels of subjects' susceptibility to schizophrenia. We suggest that the introduced quantitative characteristics and classification of cross-correlations may be used for the diagnosis of schizophrenia at the early stages of its development.
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