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Search Results: 1 - 10 of 64433 matches for " Gong-Lin Yuan "
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A nonmonotone adaptive trust-region algorithm for symmetric nonlinear equations  [PDF]
Gong-Lin Yuan, Cui-Ling Chen, Zeng-Xin Wei
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.24045
Abstract: In this paper, we propose a nonmonotone adap-tive trust-region method for solving symmetric nonlinear equations problems. The convergent result of the presented method will be estab-lished under favorable conditions. Numerical results are reported.
求解大规模非光滑优化问题的一种修正Hestenes-Stiefel共轭梯度算法
A Modified Hestenes-Stiefel Conjugate Gradient Algorithm for Large-Scale Nonsmooth Optimization Problems

黎勇,袁功林
LI Yong
,YUAN Gong-lin

- , 2018, DOI: 10.13718/j.cnki.xdzk.2018.05.013
Abstract: 利用Moreau-Yosida正则化技术和非单调线搜索技术,设计了一种针对大规模非光滑优化问题的修正Hestenes-Stiefel共轭梯度算法.该算法的搜索方向不仅自动满足充分下降条件,而且属于信赖域.在适当条件下,新算法全局收敛.初步的数值实验也表明新算法对于求解大规模非光滑无约束凸优化问题是有效的.
This paper gives a modified Hestenes-Stiefel conjugate gradient algorithm for large-scale nonsmooth optimization problems, using the Moreau-Yosida regulation approach in combination with the nonmonotone line search technique. The search direction of the algorithm not only possesses the sufficient descent property but also belongs to a trust region. The new algorithm has the global convergence under proper conditions. A preliminary numerical experiment shows that the algorithm proposed herein is more effective than the normal method for large-scale non-smooth unconstrained convex optimization problems
求解无约束问题的修正PRP共轭梯度算法
A Modified Polak-Ribière-Polyak Conjugate Gradient Algorithm for Smooth Convex Programs

李春念,袁功林
LI Chun-nian
,YUAN Gong-lin

- , 2018, DOI: 10.13718/j.cnki.xdzk.2018.09.011
Abstract: 提出了一种改进的PRP共轭梯度算法,其搜索方向自动具有充分下降性和信赖域性质,且在一定条件下,具有全局收敛性.数值结果表明该算法对求解无约束光滑问题是有效的.
In this paper, a modified PRP conjugate gradient algorithm is proposed. The search direction of this algorithm belongs to a trust region automatically, and its search direction possesses descent property. Under suitable conditions, the method owns global convergence. Some elementary numerical experiments indicate that the presented method is effective for unconstrained smooth problems
Tricarbonyl[η5-2-(methyldiphenylphosphaniumyl)-1,3,4-triphenylcyclopentadienyl]molybdenum(0)
Tao Xu,Junwei Ye,Weitao Gong,Yuan Lin
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810039747
Abstract: The title compound, [Mo(C36H29P)(CO)3], contains an Mo0 atom with a typical piano-stool coordination defined by the phosphonium cyclopentadienylide ligand η5-1-(methyldiphenylphosphaniumyl)-2,3,5-triphenyl-2,4-cyclopentadien-1-yl and by three carbonyl groups. The distance between the Mo0 atom and the cyclopentadienyl ring is 2.0616 (13) .
rac-7,7′,9,9′-Tetraphenyl-9a,9a′-bi(7,8,9,9a-tetrahydro-6aH-pentaleno[1,2,3-ij]naphthalen-8-one)
Xiangdong Zhang,Junwei Ye,Weitao Gong,Yuan Lin
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812014146
Abstract: The racemic title compound, C54H38O2, consists of two C-linked pentaleno[1,2,3-ij]naphthalenone moieties, the crowded aryl ring substitution on the cyclopentane rings forcing the two segments to assume a conformation which has pseudo-twofold rotational symmetry, with a dihedral angle between the naphthalene substituent groups of 55.30 (8)°. In each segment, the two phenyl rings have different conformational orientations, with inter-ring dihedral angles of 34.7 (2) and 49.63 (16)°. Each cyclopentane ring has the same relative configuration in its four chiral centres and together with the fused naphthalene ring assumes an overall chair-like conformation.
Resonance, Fermi surface topology, and Superconductivity in Cuprates
Yuan Zhou,Haiyang Zhang,Haiqing Lin,Chang-De Gong
Physics , 2013,
Abstract: The resonance, a collective boson mode, was usually thought to be a possible glue of superconductivity. We argue that it is rather a natural product of the \emph{d}-wave pairing and the Fermi surface topology. A universal scaling $E_{res}/2\Delta ^{H}_{S}\sim 1.0$ ($\Delta_{S}^{H}$ the magnitude of superconducting gap at hot spot) is proposed for cuprates, irrespective of the hole-/electron-doping, low-/high-energy resonance, monotonic/nonmonotonic \emph{d}-wave paring, and the parameters selected. We reveal that there may exist two resonance peaks in the electron-doped cuprates. The low- and high- energy resonance, originated from the contributions of the different intra-band component, is intimately associated with the Fermi surface topology. By analyzing the data of inelastic neutron scattering, we conclude the nonmonotonic \emph{d}-wave superconducting pairing symmetry in the electron-doped cuprates, which is still an open question
Meta-analysis of prophylactic corticosteroid use in post-ERCP pancreatitis
Minghua Zheng, Jianling Bai, Bosi Yuan, Feng Lin, Jie You, Mingqin Lu, Yuewen Gong, Yongping Chen
BMC Gastroenterology , 2008, DOI: 10.1186/1471-230x-8-6
Abstract: We employed the method recommended by the Cochrane Collaboration to perform a meta-analysis of seven randomized controlled trials (RCTs) of corticosteroid in prevention of post-ERCP pancreatitis (PEP) around the world.Most of the seven RCTs were of high quality. When the RCTs were analyzed, odds ratios (OR) for corticosteroid were 1.13 [95% CI (0.89~1.44), p = 0.32] for PEP, 1.61 [95% CI (0.74~3.52), p = 0.23] for severe PEP, 0.92 [95% CI (0.57~1.48), p = 0.73] for post-ERCP hyperamylasemia respectively. The results indicated that there were no beneficial effects of corticosteroid on acute pancreatitis and hyperamylasemia. No evidence of publication bias was found.Corticosteroids cannot prevent pancreatic injury after ERCP. Therefore, their use in the prophylaxis of PEP is not recommended.ERCP is one of the important procedures for diagnosis and treatment of several biliary and pancreatic conditions. However, ERCP can also cause acute pancreatitis and result in significant morbidity and mortality [1,2]. Depending on the definition, it has been reported that incidence of post-ERCP pancreatitis (PEP) was 1% to 40% of cases, whereas post-operative hyperamylasemia can be up to 70% of cases [3]. Although most cases of PEP were mild, about 10% of them were severe pancreatitis [4], which could result in prolonged stay in hospitals and increase risk to patients' life.There were numerous attempts to minimize occurrence and severity of PEP. However most of them were disappointed. Prevention of PEP with calcitonin, aprotonin, nifedipine and glucagon did not show any decrease in post-ERCP hyperamylasemia or pancreatitis [5-8]. Moreover, a few studies with long-acting somatostatin analogue – octreotide produced conflicting results [9-12]. Furthermore, a recent meta-analysis of all prospective randomized clinical trials (RCTs) of protease inhibitor – gabexate mesilate concluded that gabexate mesilate cannot prevent the pancreatic injury after ERCP [13].Corticosteroid is an anti-i
Induction of Heat-Shock Protein 70 Expression by Geranylgeranylacetone Shows Cytoprotective Effects in Cardiomyocytes of Mice under Humid Heat Stress
Xiaowu Wang, Binbin Yuan, Wenpeng Dong, Bo Yang, Yongchao Yang, Xi Lin, Gu Gong
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0093536
Abstract: Background Increasing evidence has revealed that humid heat stress (HHS) causes considerable damage to human health. The cardiovascular system has been suggested to be the primary target of heat stress, which results in serious cardiovascular diseases. However, there is still a lack of effective approaches for the prevention and treatment of cardiovascular diseases induced by HHS. Objective Heat-shock proteins (Hsps), especially Hsp70, are reported to provide effective cytoprotection under various stress stimuli. In the present study, we evaluated the cytoprotective effect of geranylgeranylacetone (GGA), which was previously been reported to induce Hsp70 expression in cardiomyocytes under HHS. Methods and Principal Findings Using a mouse model of HHS, we showed that the pretreatment of GGA enhanced Hsp70 expression under HHS, as examined by quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot. We then examined the effect of GGA pretreatment on the cardiomyocyte apoptosis induced by HHS using terminal-deoxynucleoitidyl transferase mediated nick end labeling (TUNEL) staining, and found that GGA pretreatment inhibited mitochondria-mediated apoptosis. GGA pretreatment could reverse the effect of HHS on cell apoptosis by increasing expression of Bcl-2, decreasing cytochrome c in cytosol, and increasing cytochrome c in mitochondria. However, GGA pretreatment had no effect on the oxidative stress induced by HHS as determined by levels of superoxide dismutase (SOD), malondialdehyde (MDA), and glutathione (GSH). Conclusion We have demonstrated that GGA pretreatment suppressed HHS-induced apoptosis of cardiomyocytes through the induction of Hsp70 overexpression.
Protective Effect of Glycyrrhizin, a Direct HMGB1 Inhibitor, on Focal Cerebral Ischemia/Reperfusion-Induced Inflammation, Oxidative Stress, and Apoptosis in Rats
Gu Gong, Lei Xiang, Libang Yuan, Ling Hu, Wei Wu, Lin Cai, Liang Yin, Hailong Dong
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0089450
Abstract: Aim Glycyrrhizin (GL) has been reported to protect against ischemia and reperfusion (I/R)-induced injury by inhibiting the cytokine activity of high mobility group box 1 (HMGB1). In the present study, the protective effects of GL against I/R injury, as well as the related molecular mechanisms, were investigated in rat brains. Methods Focal cerebral I/R injury was induced by intraluminal filamentous occlusion of the middle cerebral artery (MCA) in Male Sprague-Dawley rats. GL alone or GL and rHMGB1 were administered intravenously at the time of reperfusion. Serum levels of HMGB1 and inflammatory mediators were quantified via enzyme-linked immunosorbent assay (ELISA). Histopathological examination, immunofluorescence, RT-PCR and western blotting analyses were performed to investigate the protective and anti-apoptotic effects and related molecular mechanisms of GL against I/R injury in rat brains. Results Pre-treatment with GL significantly reduced infarct volume and improved the accompanying neurological deficits in locomotor function. The release of HMGB1 from the cerebral cortex into the serum was inhibited by GL administration. Moreover, pre-treatment with GL alleviated apoptotic injury resulting from cerebral I/R through the inhibition of cytochrome C release and caspase 3 activity. The expression levels of inflammation- and oxidative stress-related molecules including TNF-α, iNOS, IL-1β, and IL-6, which were over-expressed in I/R, were decreased by GL. P38 and P-JNK signalling were involved in this process. All of the protective effects of GL could be reversed by rHMGB1 administration. Conclusions GL has a protective effect on ischemia-reperfusion injury in rat brains through the inhibition of inflammation, oxidative stress and apoptotic injury by antagonising the cytokine activity of HMGB1.
Fifth-order canonical polyadic decomposition with partial symmetry via joint diagonalization for combined independent component analysis and canonical / Parallel factor analysis
Xiao-Feng Gong,Cheng-Yuan Wang,Ya-Na Hao,Qiu-Hua Lin
Computer Science , 2013,
Abstract: Recently, there has been a trend to combine independent component analysis and canonical / parallel factor analysis (ICA-CPA) for an enhanced robustness for the computation of CPA, and ICA-CPA could be further converted into the problem of canonical polyadic decomposition (CPD) of a 5th-order partially symmetric tensor, by calculating the 4th-order cumulant of a trilinear mixture. In this study, we propose a new 5th-order CPD algorithm constrained with partial symmetry using joint diagonalization. As the main steps involved in the proposed algorithm undergo no updating iterations for the loading matrices, it is much faster than the existing algorithm based on alternating least squares and enhanced line search, and therefore could be used as a nice initialization for the latter. Simulation results are given to examine the performance of the proposed algorithm.
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