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Search Results: 1 - 10 of 48864 matches for " HU Yuan-Yuan "
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Image Hashing Algorithm Based on Robust Bits Extraction in JPEG Compression Domain
Yuan-Yuan Hu,Xia-Mu Niu
Information Technology Journal , 2010,
Abstract: Perceptual image hashing algorithm based on content-preserving property has a promising application in image retrieval and identification. By statistical analysis of the low frequency coefficients of quantized DCT blocks in JPEG compressed images, a strong correlation between the perceptual similar images is observed. The positions of the most significant low frequency coefficients are found to be invariant during common signal processings and even some geometric distortions. Based on these, a JPEG-compatible image hashing algorithm is proposed. It is verified by our experiments that the proposed algorithm not only has a strong robustness of JPEG compression (QF = 5) and common signal processings, but also is robust to geometric distortions of cropping and resize (more than 5%) and rotation (more than 3 degree), which is absent in other hashing algorithms in JPEG compression domain. Since, JPEG decoder is not needed during generating the hashing, it is more convenient and efficient for index and recognition in large image databases or the internet than those in pixel-wise domain.
A New Method of Time Domain Solution and Stability Analysis for Periodic Orbits of Piecewise Linear Dynamic Systems
分段线性动态系统周期轨道的时域法求解及其稳定性分析

Hu Qing-bin,Lu Yuan-yuan,
胡庆彬
,卢元元

电子与信息学报 , 2008,
Abstract: This paper proposes a new method to get time solutions of periodic orbits and to determine their stability for piecewise linear dynamic systems. The state space of piecewise linear dynamic system is cut into some linear subspaces by several switching surfaces. By solving together all the equations of periodic orbit in these subspaces with MATLAB, the coordinates of periodic orbit on each switching surface and the running time on each subspace are obtained, from which the time expressions in sections of periodic orbit can be derived. Based on these expressions, the Poincare mapping equation and the Jacobian matrix of periodic orbits can be deduced. According to the eigenvalues of the Jacobian matrix, the stability of the periodic orbit can be determined. Using 3rd-order and 4th-order Chau’s circuits as examples, the time expressions of many periodic orbits are obtained and their stability is determined respectively by the new method. The results are exact the same as that of digital simulations, which shows the new method is correct and practical.
New algorithm for mining sequential patterns
一种序列模式发现的新方法

HU Xue-gang,ZHANG Yuan-yuan,
胡学钢
,张圆圆

计算机应用研究 , 2008,
Abstract: To the question of sequential pattern mining,this paper introduced frequent 2sequence graph(F2SG) to express the sequence information related to the mining task by scanning the transaction database only once.Based on F2SG,proposed a new sequential pattern mining algorithm GBSP.The graph representation of database could fully utilize the property of item ordering in the mining process,thus improving the generation efficiency of frequent sequences.Theory analysis and experiment results show that it has better performance in time and space properties than traditional sequential pattern mining algorithms.
1-(4-Fluorophenyl)-5-(4-methoxyphenyl)pyrazolidin-3-one
Bao-Jiang Dai,Yuan-Yuan Liu,Qing-Bing Xu,Jing Hu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809007144
Abstract: In the molecule of the title compound, C16H15FN2O2, the benzene rings are oriented at a dihedral angle of 88.61 (3)°. The five-membered ring adopts an envelope conformation. Intramolecular C—H...N hydrogen bonds result in the formation of two planar five-membered rings. In the crystal structure, intermolecular N—H...O and C—H...F hydrogen bonds link the molecules, forming R22(8) and R22(18) ring motifs. Weak C—H...π interactions may further stabilize the structure.
1-{(1Z)-1-[3-(2,4-Dichlorophenoxy)propoxy]-1-(2,4-difluorophenyl)prop-1-en-2-yl}-1H-1,2,4-triazole
Yuan-yuan Luan,Yong-hong Hu,Song Guo,Jing Zhu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812017874
Abstract: In the title compound, C20H17Cl2F2N3O2, the triazole ring makes dihedral angles of 28.0 (3) and 72.5 (2)° with the 2,4-dichloropheny and 2,4-difluorophenyl rings, respectively, and the molecule adopts a Z-conformation about the C=C double bond. In the crystal, C—H...O and C—H...N hydrogen bonds link the molecules.
1-{(Z)-1-(2,4-Dichlorophenyl)-1-[2-(4-methylphenoxy)ethoxy]prop-1-en-2-yl}-1H-imidazol-3-ium nitrate
Song Guo,Yong-hong Hu,Yuan-yuan Luan,Lu-lu Wang
Acta Crystallographica Section E , 2013, DOI: 10.1107/s1600536812046181
Abstract: In the title salt, C21H21Cl2N2O2+·NO3 , the imidazole ring makes dihedral angles of 43.39 (14) and 10.9 (2)° with the 4-methylphenyl and 2,4-dichlorophenyl rings, respectively. The molecule adopts a Z conformation about the C=C double bond, which links the imidazole ring to the 4-methylphenoxy unit via an ethoxy chain. In the crystal, cations and anions are linked into chains by N—H...O and C—H...O hydrogen bonds.
Transverse Momentum, Centrality, and Participant Nucleon Number Dependence of Elliptic Flow
Bao-Chun Li,Yuan-Yuan Fu,Li-Li Wang,Fu-Hu Liu
Advances in High Energy Physics , 2013, DOI: 10.1155/2013/908046
Abstract:
MicroRNA expression profile of the hippocampus in a rat model of temporal lobe epilepsy and miR-34a-targeted neuroprotection against hippocampal neurone cell apoptosis post-status epilepticus
Hu Kai,Xie Yuan-Yuan,Zhang Chen,Ouyang Dong-Sheng
BMC Neuroscience , 2012, DOI: 10.1186/1471-2202-13-115
Abstract: Background The expression pattern and function of miRNAs in the rat model of temporal lobe epilepsy have not been well defined. Profiling miRNA expression in the rat model of temporal lobe epilepsy and investigating the function of specific miRNAs in epilepsy offers the prospect of a deeper understanding of the mechanisms of epilepsy. Methods The lithium-pilocarpine-induced status epilepticus model and the temporal lobe epilepsy model were established in Sprague–Dawley rats. Samples were analysed to detect deregulated miRNAs in the hippocampal temporal lobe, and several of these deregulated miRNAs were confirmed by qPCR. The expression of the pro-apoptotic miR-34a was detected at 1 day, 7 days and 2 weeks post-status epilepticus and at 2 months after temporal lobe epilepsy. The antagomir of miR-34a was then utilised. The expression of miR-34a after targeting and the expression change of activated caspase-3 protein were examined. The effects of altering the expression of miR-34a and activated caspase-3 protein on neuronal survival and neuronal death or apoptosis post-status epilepticus were assessed. Results The miRNA microarray detected 9 up-regulated miRNAs (miR-146a, -211, -203, -210, -152, -31, -23a, -34a, -27a) and 15 down-regulated miRNAs (miR-138*, -301a, -136, -153, -19a, -135b, -325-5p, -380, -190, -542-3p, -33, -144, -542-5p, -543, -296*). Some of the deregulated miRNAs (miR-146a, miR-210, miR-27a, miR-135b and miR-33) were confirmed using qPCR. Furthermore, an increase in expression of the pro-apoptotic miR-34a was demonstrated in the post-status epilepticus rat hippocampus. miR-34a was significantly up-regulated at 1 day, 7 days and 2 weeks post-status epilepticus and at 2 months after temporal lobe epilepsy. Experiments with the miR-34a antagomir revealed that targeting miR-34a led to an inhibition of activated caspase-3 protein expression, which may contribute to increased neuronal survival and reduced neuronal death or apoptosis. Conclusions Our study showed the expression profile of miRNAs in the hippocampus in a rat model of temporal lobe epilepsy and an increase in the expression of the pro-apoptotic miR-34a in post-status epilepticus rats. The results show that miR-34a is up-regulated during seizure-induced neuronal death or apoptosis, and targeting miR-34a is neuroprotective and is associated with an inhibition of an increase in activated caspase-3 protein.
Pioglitazone Inhibits the Expressions of p22phox and p47phox in Rat Mesangial Cells In Vitro
Shan Wang,Shan-dong Ye,Wen-jia Sun,Yuan-yuan Hu
ISRN Endocrinology , 2014, DOI: 10.1155/2014/601352
Abstract: Aim. The purpose of this study was to investigate the effects of pioglitazone on oxidative stress and the expressions of p22phox and p47phox, subunits of NADPH oxidase, in mesangial cells (MCs). Method. Rat mesangial cells were cultured and randomly divided into normal glucose (NG) group, high glucose (HG) group, and pioglitazone group. After 48?h exposure, the supernatants and cells were collected. The expressions of p22phox and p47phox in MCs were detected by RT-PCR and western blot. The levels of intracellular ROS were determined by flow cytometry. Coloimetry method was used to detect malondialdehyde (MDA) concentrations and superoxide dismutase (SOD) activities. Results. Compared with the NG group, the expression levels of p22phox, p47phox and ROS significantly increased, the activity of SOD decreased in HG group, while the concentration of MDA greatly increased ( ). Pioglitazone significantly suppressed HG-induced p22phox and p47phox expressions and oxidative stress. The protein and gene expressions of p22phox and p47phox were markedly reduced after pioglitazone treatment, so did the ROS generation. The activities of SOD in MCs increased, while the concentrations of MDA in the supernatant decreased greatly by pioglitazone. Conclusions. Pioglitazone can inhibit HG-induced oxidative stress in MCs through suppressing p22phox and p47phox expressions. 1. Introduction Diabetic nephropathy (DN) is the most common cause of end stage renal failure and is a chronic disease characterized by proteinuria, glomerular hypertrophy, decreased glomerular filtration, and renal fibrosis with loss of renal function. Recent studies have shown that oxidative stress promotes the progression of DN [1, 2]. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidase is the predominant enzyme source for ROS generation, which is composed of five subunits comprising a membrane-associated p22phox, a gp91phox subunit and at least four cytosolic subunits: p47phox, p67phox, p40phox, and rac-1/2. Subunits such as p22phox and p47phox were mainly expressed in the kidney. Mesangial cells (MCs), an inherent cell of kidney, play an important role during the development and progression of chronic kidney disease, including DN [3]. Pioglitazone, one of the peroxisome proliferator-activated receptor-γ (PPAR-γ) agonists, is used clinically in the treatment of type 2 diabetes through its insulin-sensitizing effect. Accumulating evidences suggest that pioglitazone may be beneficial for DN independent of its hypoglycemic effects [4–6]. The role of pioglitazone in modulating oxidative stress has
Dependence of elliptic flow on transverse momentum in 200 GeV Au-Au and 2.76 TeV Pb-Pb collisions
Bao-Chun Li,Yuan-Yuan Fu,Er-Qin Wang,Fu-Hu Liu
Physics , 2011, DOI: 10.1088/0256-307X/29/7/072501
Abstract: We investigate the dependence of elliptic flows $v_2$ on transverse momentum $P_T$ for charged hadrons produced in nucleus-nucleus collisions at high energy by using a multi-source ideal gas model which includes the interaction contribution of the emission sources. Our calculated results are approximately in agreement with the experimental data over a wider $P_T$ range from the STAR and ALICE Collaborations. It is found that the expansion factor increases linearly with the impact parameter from most central (0-5%) to mid-peripheral (35-40%) collisions.
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