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Search Results: 1 - 10 of 44279 matches for " Pengcheng Wu "
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Composition operators from the Bloch space into the spaces
Pengcheng Wu,Hasi Wulan
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s0161171203207122
Abstract: Suppose that φ(z) is an analytic self-map of the unit disk Δ. We consider the boundedness of the composition operator Cφ from Bloch space ℬ into the spaces QT (QT,0) defined by a nonnegative, nondecreasing function T(r) on 0≤r<∞.
A Hybrid De-Noising Method on LASCA Images of Blood Vessels  [PDF]
Cong Wu, Nengyun Feng, Koichi Harada, Pengcheng Li
Journal of Signal and Information Processing (JSIP) , 2012, DOI: 10.4236/jsip.2012.31012
Abstract: A de-noising approach is proposed that based on the combination of wiener filtering, nonlinear filtering and wavelet fusion, which de-noise the LASCA (LAser Speckle Contrast Analysis) image of blood vessels in Small Animals. The approach first performs laser spectral contrast analysis on brain blood flow in rats, get their spatial and temporal contrast images. Then, a de-noising filtering method is proposed to deal with noise in LASCA. The image restoration is achieved by applying the proposed admixture filtering, and the subjective estimation and objective estimation are given to the de-noising images. As our experimental results shown, the proposed method provides clearer subjective sense and improved to over 25 db for PSNR.
GUCY2D Gene Mutation in a Family with Leber Congenital Amaurosis
Wu Li,Li Pengcheng,Xing Yiqiao
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.2953.2956
Abstract: To detect and analyze GUCY2D gene mutations in a family with Leber Congenital Amaurosis (LCA) in China. Researchers collected peripheral blood samples from affected family members in three generations. Genomic DNA was extracted and all 20 exons of the GUCY2D gene were amplified using the DNA of the proband as the template. The ABI 3100 automated sequencer was used for sequencing. The sequencing results revealed one Single Nucleotide Polymorphism (SNP): c.154G.T (p.A52S) on exon 2 of the GUCY2D gene. The encoded amino acid changed from alanine to serine. All affected family members carried this SNP.
Roles of the DYRK Kinase Pom2 in Cytokinesis, Mitochondrial Morphology, and Sporulation in Fission Yeast
Pengcheng Wu,Ran Zhao,Yanfang Ye,Jian-Qiu Wu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0028000
Abstract: Pom2 is predicted to be a dual-specificity tyrosine-phosphorylation regulated kinase (DYRK) related to Pom1 in Schizosaccharomyces pombe. DYRKs share a kinase domain capable of catalyzing autophosphorylation on tyrosine and exogenous phosphorylation on serine/threonine residues. Here we show that Pom2 is functionally different from the well-characterized Pom1, although they share 55% identity in the kinase domain and the Pom2 kinase domain functionally complements that of Pom1. Pom2 localizes to mitochondria throughout the cell cycle and to the contractile ring during late stages of cytokinesis. Overexpression but not deletion of pom2 results in severe defects in cytokinesis, indicating that Pom2 might share an overlapping function with other proteins in regulating cytokinesis. Gain and loss of function analyses reveal that Pom2 is required for maintaining mitochondrial morphology independently of microtubules. Intriguingly, most meiotic pom2Δ cells form aberrant asci with meiotic and/or forespore membrane formation defects. Taken together, Pom2 is a novel DYRK kinase involved in regulating cytokinesis, mitochondrial morphology, meiosis, and sporulation in fission yeast.
Processing Chip for Thin Film Bulk Acoustic Resonator Mass Sensor
Pengcheng Jin,Shurong Dong,Hao Jin,Mengjun Wu
Journal of Control Science and Engineering , 2012, DOI: 10.1155/2012/923617
Abstract: Aimed at portable application, a new integrated process chip for thin film bulk acoustic resonator (FBAR) mass sensor is proposed and verified with 0.18?um CMOS processing in this paper. The longitudinal mode FBAR with back-etched structure is fabricated, which has resonant frequency 1.878?GHz and factor 1200. The FBAR oscillator, based on the current-reuse structure, is designed with Modified Butterworth Van Dyke (MBVD) model. The result shows that the FBAR oscillator operates at 1.878?GHz with a phase noise of ?107?dBc/Hz and ?135?dBc/Hz at 10?KHz and 100?KHz frequency offset, respectively. The whole process chip size with pads is 1300?μm × 950?μm. The FBAR and process chip are bonded together to sense tiny mass. The measurement results show that this chip precision is 1?KHz with the FBAR frequency gap from 25?kHz to 25?MHz. 1. Introduction In recent years, mass sensor based on FBAR technology has a rapid development due to its high mass sensitivity and integrated potential [1]. FBAR mass sensor is considered as an excellent portable healthcare sensor resolution [2, 3]. Recent researches mainly focus on relative humidity sensor [4], glycerol detector [5], gravimetric sensing [6], ultraviolet sensor [7], DNA and protein detection [8], microfluidic system [9], and so on. However, by now FBAR mass sensors are handled with network analyzer and RF probe station, which is massive and various with testing environment. It is not fit to portable application. There is no paper to report FBAR sensor signal processing chip and its FBAR oscillator. In this paper, we presented an integrated chip, which can be connected with FBAR to process its RF sensor signal and show mass change value directly. 2. FBAR Sensor Design 2.1. System Scheme FBAR structure is shown in Figure 1. It consists of an AlN thin piezoelectric film sandwiched by two Al metal electrodes with back-etched structure and an adsorption layer which is used to adsorb a particular material for sensor. The adsorption layer should be selected according to the different detected target materials. The resonant frequency will change due to the change of mass of the target material. Conversion between frequency change and the mass loading is described by the Sauerbrey equation [10]: in which is the frequency change, is the fundamental resonant frequency, is the mass change, is the active area, is the density, and is the shear modulus. Figure 1: Cross-section structure of FBAR. The sensor process system should be designed to obtain FBAR resonant frequency changes due to tiny mass. Usually, the system is based
STUDIES ON EPIPHYLLOUS LIVERWORTS IN CHINA (V)--Epiphyllous liverworts in Heishiding NaturalReserve, Guangdong Province

Li Zhihu,Wu Pengcheng,

热带亚热带植物学报 , 1992,
Abstract: A survey dealing with epiphyllous liverworts in Heishiding Natural Reserve, Guangdong Province, is first reported for epiphyllous liverworts in the west part of the province. Two families, 7 genera, 13 species and 1 variety of epiphyllous liverworts were found. The most common species of them are Leptolejeunea elliptica and Radula acuminata, and then Leptolejeunea hainanensis and Cololejeunea floccosa, which distribute in the evergreen broadleaved forests in ravines at 350m to 600m above sea level. From the viewpoint of bryoflora analysis, epiphyllous liverworts in Heishiding are similiar to that as in Wu yi Mt. (Fujian Province) , in Xishuangbanna and Taiwan. The similiar to each other species in these regions make up 50-70%, which are the major elements of South Asia and have significantly endemic to China species, amounting to 28. 5%.
Batch zero-steganographic model for graph transformation
Gouxi Chen,Pengcheng Zhang,Meng Zhang,Yuliang Wu
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i4.863
Abstract: To further improve the security of digital image steganography, based on graph transformation diversity, proposing a zero-steganographic model .After divided into many blocks, the secret information is deduced by graphic transform algorithm, a cover image steganographic model for not carrying secret information is constructed. Firstly, selecting a batch of cover images, through a particular transformation algorithm for them, and then find out the correlation of pixels between secret images and the new images, finally return to its original for transmission. Extracting secret information only to need the key without carrier images, further improve the security of secret information. Experimental results and analysis show that this model confidential is strong, the security is good, applies to images concealed communication
A Framework of Sparse Online Learning and Its Applications
Dayong Wang,Pengcheng Wu,Peilin Zhao,Steven C. H. Hoi
Computer Science , 2015,
Abstract: The amount of data in our society has been exploding in the era of big data today. In this paper, we address several open challenges of big data stream classification, including high volume, high velocity, high dimensionality, high sparsity, and high class-imbalance. Many existing studies in data mining literature solve data stream classification tasks in a batch learning setting, which suffers from poor efficiency and scalability when dealing with big data. To overcome the limitations, this paper investigates an online learning framework for big data stream classification tasks. Unlike some existing online data stream classification techniques that are often based on first-order online learning, we propose a framework of Sparse Online Classification (SOC) for data stream classification, which includes some state-of-the-art first-order sparse online learning algorithms as special cases and allows us to derive a new effective second-order online learning algorithm for data stream classification. In addition, we also propose a new cost-sensitive sparse online learning algorithm by extending the framework with application to tackle online anomaly detection tasks where class distribution of data could be very imbalanced. We also analyze the theoretical bounds of the proposed method, and finally conduct an extensive set of experiments, in which encouraging results validate the efficacy of the proposed algorithms in comparison to a family of state-of-the-art techniques on a variety of data stream classification tasks.

WU Chuansong,ZHAO Pengcheng,

金属学报 , 2006,
Abstract: The weld penetration extent was described by 3D information on the surface depression of full-penetrated weldpool. According to a developed model for transient behaviors of tungsten-inertgas arc weldpool, the dynamic evolution process of surface depression of full-penetrated weldpool in quasi-steady state after changing welding process parameters is numerically simulated, and the basic data obtained can be used in designing weld penetration control system. The welding experiment showed that the predicted surface depressions for both top and bottom sides of weldpool are in agreement with the measured ones.
In Vitro Synergistic Antioxidant Activity and Identification of Antioxidant Components from Astragalus membranaceus and Paeonia lactiflora
Xiaoyan Xu, Feng Li, Xin Zhang, Pengcheng Li, Xing Zhang, Zhaoxi Wu, Dapeng Li
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0096780
Abstract: Many traditionally used herbs demonstrate significantly better pharmacological effects when used in combination than when used alone. However, the mechanism underlying this synergism is still poorly understood. This study aimed to investigate the synergistic antioxidant activity of Astragalus membranaceus (AME) and Paeonia Lactiflora (PL), and identify the potential antioxidant components by 1,1-diphenyl-2-picrylhydrazine (DPPH) radical spiking test followed by a high performance liquid chromatography separation combined with diode array detection and tandem mass spectrometry analysis (DPPH-HPLC-DAD-MS/MS). Eight AME-PL combined extracts (E1–E8) were prepared based on bioactivity-guided fractionation. Among them, E1 exhibited the strongest synergistic effect in scavenging DPPH radicals and reducing ferric ions (P<0.05). Moreover, E1 presented strong cytoprotection against H2O2-induced oxidative damage in MRC-5 cells by suppressing the decrease of the superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and catalase (CAT) activities. A strong correlation between the increment of total phenolic/flavonoid and synergistic antioxidant activity, especially between the increment of total flavonoid and the increase in ferric reducing power was observed. Finally, seven antioxidant substances were identified in E1 as oxypaeoniflora, catechin, calycosin-7-O-β-D-glucopyranoside, fomononetin-7-O-β-D-glucopyranoside, 9,10-dimethoxy-pterocarpan-3-O-β-D-gluco?pyranoside,quercetin and 2′-dihydroxy-3′,4′-dimethyl-isoflavan-7-?O-β-D-glucopyranoside.
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