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Search Results: 1 - 10 of 10904 matches for " Huifeng Xi "
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A broadband metamaterial cylindrical lens antenna
HuiFeng Ma,Xi Chen,XinMi Yang,HongSheng Xu,Qiang Cheng,TieJun Cui
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3021-y
Abstract: We present a Luneberg-like cylindrical lens antenna experimentally using metamaterials. The cylindrical lens antenna with a broad bandwidth is made up of the non-resonant I-shaped metamaterial structures. The near-field distributions of the metamaterial lens antenna are measured using a two-dimensional near-field microwave scanning apparatus, and agree well with the simulation results. The far-field radiation patterns of the antenna are also presented to show the high-gain performance in the broad bandwidth.
Linkage analysis on chromosome 2 in essential hypotension pedigrees
Huifeng Xi,Yuehai Ke,Junhua Xiao,Hongyu Li,Jianzhong Jin,Wei Huang,Li Jin,Daru Lu
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9338
Abstract: It is a new approach to study the important genes related to the control of blood pressure by probing into hypotension and hypertension at the same time. Genome scanning on whole chromosome 2 in 8 hypotension pedigrees has been done and parameter (LOD score) and non-parameter (NPL score) were used in the linkage analysis by GENEHUNTER software. The results show the evidence of linkage between D2S112 and D2S117, indicating a number of critical genes may lie in this region and contribute to the mechanism of blood pressure regulation. Also this region has been found in the previous study in hypertension pedigrees. These genes may play an important role in the regulation of blood pressure and can also be the important candidate genes in hypertension studies.
The origin of Mosuo people as revealed by mtDNA and Y chromosome variation
Bo Wen,Hong Shi,Ling Ren,Huifeng Xi,Kaiyuan Li,Wenyi Zhang,Bing Su,Shiheng Si,Li Jin,Chunjie Xiao
Science China Life Sciences , 2004, DOI: 10.1360/02yc0207
Abstract: The Mosuo, living in the Lugu Lake area in northwest Yunnan Province, China, is the only matriarchal population in China. The Mosuo was officially identified as Naxi nationality although its relationship with Naxi remains controversial. We studied the genetic relationship between the Mosuo and five other ethnic groups currently residing in northwest Yunnan, i.e. Naxi, Tibetan, Bai, Yi and Pumi, by typing the genetic variations in mtDNA HVS1 and 21 Y chromosome markers (13 SNPs & 8 STR markers). We showed that the maternal lineages of the Mosuo bear the strongest resemblance with those found in Naxi while its paternal lineages are more similar to those that are prevalent in Yunnan Tibetan. The marked difference between paternal and maternal lineages may be attributable to the genetic history, matriarchal structure, and visiting marriage.
Dynamic Properties of Coupled Maps
Chunrui Zhang,Huifeng Zheng
Discrete Dynamics in Nature and Society , 2010, DOI: 10.1155/2010/905102
Abstract: Dynamic properties are investigated in the coupled system of three maps with symmetric nearest neighbor coupling and periodic boundary conditions. The dynamics of the system is controlled by certain coupling parameters. We show that, for some values of the parameters, the system exhibits nontrivial collective behavior, such as multiple bifurcations, and chaos. We give computer simulations to support the theoretical predictions. 1. Introduction Coupled maps is one of the most interesting topics on spatial extended systems. Bifurcation and chaos of coupled maps generated by iterated maps of nonlinear difference equations have attracted considerable attention in both theoretical studies and practical applications [1]. When many identical maps are coupled to a larger system (coupled map lattices or CML), the system can exhibit nontrivial collective behavior, such as stability, multiple bifurcations, and chaos [2–7]. In this paper, we extend this work by considering three-dimensional discrete dynamical systems which arise from three coupled one-dimensional maps with delay. In general, delayed coupled maps of three maps with symmetric nearest neighbor coupling and periodic boundary conditions can be described as where are parameters. Symmetry breaking Hopf bifurcations from steady states to periodic orbits can occur in systems with some symmetry. The coexistence of more chaotic attractors in phase space is phenomenon that has been proven to exist in many fields of science. There are many researches of equivariant bifurcations of ODEs. We refer the readers to the study by Golubitsky et al. in [8]. But, until now, there are fewer papers to discuss equivariant bifurcation problems in maps, which motivates us to write this paper. The goal of this paper is to investigate how parameters affect coupled maps with delay (1.1) by using the symmetric groups theory of Chossat and Golubitsky [9]. Accordingly, the paper is organized as follows. In Sections 2 and 3, we show that the structure of system (1.1) can be represented by a dihedral group . The generalized center subspace is invariant under the action of the symmetry group, and the center manifold reduction can be performed in such a way that the reduced equations commute with the restricted action of the symmetry group. We obtain some important results about the stability and chaos and spontaneous bifurcations of multiple branches of periodic solutions and their spatiotemporal patterns, which describe the oscillatory mode of each oscillator. Finally, some numerical simulations are carried out to support the
Subarachnoid hemorrhage: tests of association with apolipoprotein E and elastin genes
Ritesh Kaushal, Daniel Woo, Prodipto Pal, Mary Haverbusch, Huifeng Xi, Charles Moomaw, Padmini Sekar, Brett Kissela, Dawn Kleindorfer, Matthew Flaherty, Laura Sauerbeck, Ranajit Chakraborty, Joseph Broderick, Ranjan Deka
BMC Medical Genetics , 2007, DOI: 10.1186/1471-2350-8-49
Abstract: At the APOE locus, no individual SNP was associated with SAH after correction for multiple comparisons. Haplotype analysis revealed significant association of the major haplotype (Hap1) in APOE with SAH (p = 0.001). The association stemmed from both the 5' promoter and the 3' region of the APOE gene. APOE ε2 and ε 4 were not significantly associated with SAH. No association was observed for ELN at genotype, allele, or haplotype level and our study failed to confirm previous reports of ELN association with aneurysmal SAH.This study suggests a role of the APOE gene in the etiology of aneurysmal SAH.Non-traumatic, spontaneous subarachnoid hemorrhage (SAH) affects 16,000 to 17,000 individuals each year in the United States [1-3]. SAH has a 30-day mortality rate exceeding 40%, and surviving patients often demonstrate significant morbidity [2,4]. Over 80% of SAH can be attributed to intracranial aneurysm (IA) rupture. Familial aggregation studies of SAH have consistently identified an increased risk of a first-degree relative with SAH or family history of SAH independent of smoking and hypertension [5].Variants of the apolipoprotein E (APOE) gene have been associated with Alzheimer's disease, lipid disorders and cardiovascular disease [6-8]. Previous studies have demonstrated that APOE ε4 and/or APOE ε2 are associated with lobar intracerebral hemorrhage (ICH) [9,10]. We recently reported that haplotypes which include polymorphisms in the 5' untranslated region of the APOE gene are risk factors for lobar ICH [11]. Specific to SAH, Kokubo et al. [12] found significant association of APOE ε4 with SAH in a Japanese population. Niskakangas et al. [13] reported association of APOE ε4 with adverse outcome after aneurysmal SAH. No study on other polymorphisms of APOE with regard to risk of SAH has yet been reported.In addition to APOE, the elastin (ELN) gene emerged as a putative gene for IA after linkage was found on 7q11, where ELN is located [14]. However, prior association st
A tagging SNP in INSIG2 is associated with obesity-related phenotypes among Samoans
Ranjan Deka, Ling Xu, Prodipto Pal, Palanitina T Toelupe, Tuiasina S Laumoli, Huifeng Xi, Ge Zhang, Daniel E Weeks, Stephen T McGarvey
BMC Medical Genetics , 2009, DOI: 10.1186/1471-2350-10-143
Abstract: We studied 907 adult Samoan participants from a longitudinal study of adiposity and cardiovascular disease risk in two polities, American Samoa and Samoa. Four tagSNPs were identified from the Chinese HapMap database based on pairwise r2 of ≥0.8 and minor allele frequency of ≥0.05. Genotyping was performed using the TaqMan assay. Tests of association with BMI and ABDCIR were performed under the additive model.We did not find association of rs7566605 with either BMI or ABDCIR in any group of the Samoans. However, the most distally located tagSNPs in Intron 3 of the gene, rs9308762, showed significant association with both BMI (p-value 0.024) and ABDCIR (p-value 0.009) in the combined sample and with BMI (p-value 0.038) in the sample from Samoa.Although rs7566605 was not significantly associated with obesity in our study population, we can not rule out the involvement of INSIG2 in obesity related traits as we found significant association of another tagSNP in INSIG2 with both BMI and ABDCIR. This study suggests the importance of comprehensive assessment of sequence variants within a gene in association studies.Using genome-wide association analysis, Herbert et al. [1] reported a common variant, rs7566605, in the 5' region of the INSIG2 gene associated with obesity in the Framingham Heart Study population samples and also replicated this finding in four independent cohorts of European and African American ancestries. However, the association of this variant remains inconclusive with confirmation or lack thereof in several follow-up studies conducted in populations of diverse ethnicities [2-12]. Analysis of a single variant could be perceived as a limitation in assessing genetic association of a putative locus. To guard against this potential limitation we conducted a comprehensive association analysis of common tagging SNPs in the INSIG2 gene among adult Samoans, Polynesians of the Western Pacific, residing in Samoa and American Samoa.Our study sample derives from a lo
The origin of Mosuo people as revealed by mtDNA and Y chromosome variation
WEN Bo,SHI Hong,REN Ling,XI Huifeng,LI Kaiyuan ZHANG Wenyi SU Bing,SI Shiheng JIN Li,XIAO Chunjie,

中国科学C辑(英文版) , 2004,
Abstract: The Mosuo, living in the Lugu Lake area in northwest Yunnan Province, China, is the only matriarchal population in China. The Mosuo was officially identified as Naxi nationality although its relationship with Naxi remains controversial. We studied the genetic relationship between the Mosuo and five other ethnic groups currently residing in northwest Yunnan, i.e. Naxi, Tibetan, Bai, Yi and Pumi, by typing the genetic variations in mtDNA HVS1 and 21 Y chromosome markers (13 SNPs & 8 STR markers). We showed that the maternal lineages of the Mosuo bear the strongest resemblance with those found in Naxi while its paternal lineages are more similar to those that are prevalent in Yunnan Tibetan. The marked difference between paternal and maternal lineages may be attributable to the genetic history, matriarchal structure, and visiting marriage.
Hybrid partial least squares and neural network approach for short-term electrical load forecasting

Shukang YANG,Ming LU,Huifeng XUE,

控制理论与应用 , 2008,
Abstract: Intelligent systems and methods such as the neural network (NN) are usually used in electric power systems for short-term electrical load forecasting. However, a vast amount of electrical load data is often redundant, and linearly or nonlinearly correlated with each other. Highly correlated input data can result in erroneous prediction results given out by an NN model. Besides this, the determination of the topological structure of an NN model has always been a problem for designers. This paper presents a new artificial intelligence hybrid procedure for next day electric load forecasting based on partial least squares (PLS) and NN. PLS is used for the compression of data input space, and helps to determine the structure of the NN model. The hybrid PLS-NN model can be used to predict hourly electric load on weekdays and weekends. The advantage of this methodology is that the hybrid model can provide faster convergence and more precise prediction results in comparison with abductive networks algorithm. Extensive testing on the electrical load data of the Puget power utility in the USA confirms the validity of the proposed approach.
Honeypot Protection Detection Response Recovery Model for Information Security Management Policy
Shubao Xing,Huifeng Xue,Gang Li
Asian Social Science , 2010, DOI: 10.5539/ass.v6n12p50
Abstract: Focusing on characteristics of information management in SME that most information security models assign the detection function to the operational process of enterprise, this paper proposes an information security management model for SMEs ---- the HPDRR (Honeypot Protection Detection Response Recovery) model. By means of empirical studies, this paper summarizes the scheme for executing, maintaining, and improving the information security management policy in SMEs in China.
Design of Seven-core Photonic Crystal Fiber with Flat In-phase Mode for Yb: Fiber Laser Pumping  [PDF]
Ruijuan Dong, Peiguang Yan, Gelin Zhang, Huiquan Li, Shuangchen Ruan, Huifeng Wei, Jie Luo
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32B047
Abstract:

We numerically investigate the seven-core photonic crystal fiber (PCF) with the zero dispersion wavelength designed in the range of 1000 - 1080 nm, particularly suitable for the ytterbium-doped fiber laser pumping. Also, the PCFs are well designed for obtaining a flat in-phase mode by carefully adjusting the diameter of inner layer six holes, and the corresponding empirical values of fiber structure are summarized and listed. The variations of inner six holes to the amplitude of in-phase mode are further investigated, and our results show that a better tolerance can be achieved in the fiber structures with lower filling ratio configuration.

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