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AN ASYMPTOTIC-NUMERICAL ANALYSIS FOR THE LOWER BOUND DYNAMIC BUCKLING ESTIMATES
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作者 吴柏生 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1997年第2期165-170,共6页
A finite element asymptotic analysis for determining the lower bound dynamic buckling estimates of imperfection-sensitive structures under step load of infinite duration is presented. The lower bound dynamic buckling ... A finite element asymptotic analysis for determining the lower bound dynamic buckling estimates of imperfection-sensitive structures under step load of infinite duration is presented. The lower bound dynamic buckling loads and the corresponding displacements are sought in the form of asymptotic expansions based on the static stability criterion and they can be determined by solving numerically (FEM) several linear problems with a single nonsingular sub-stiffness matrix. 展开更多
关键词 dynamic buckling lower bound estimate FEM implementation
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ESTIMATES ON THE FINITE ELEMENT APPROXIMATIONS OF A QUADRATIC FUNCTIONAL
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作者 Xiaqi Ding 《Acta Mathematica Scientia》 SCIE CSCD 2012年第1期209-218,共10页
This paper gives some estimates of a quadratic functional related with Rie- mann Hypothesis.
关键词 quadratic functional estimate of lower bound finite element
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Lower bounds of principal eigenvalue in dimension one 被引量:4
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作者 Mu-Fa CHEN 《Frontiers of Mathematics in China》 SCIE CSCD 2012年第4期645-668,共24页
For the principal eigenvalue with bilateral Dirichlet boundary condition, the so-called basic estimates were originally obtained by capacitary method. The Neumann case (i.e., the ergodic case) is even harder, and wa... For the principal eigenvalue with bilateral Dirichlet boundary condition, the so-called basic estimates were originally obtained by capacitary method. The Neumann case (i.e., the ergodic case) is even harder, and was deduced from the Dirichlet one plus a use of duality and the coupling method. In this paper, an alternative and more direct proof for the basic estimates is presented. The estimates in the Dirichlet case are then improved by a typical application of a recent variational formula. As a dual of the Dirichlet case, the refine problem for bilateral Neumann boundary condition is also treated. The paper starts with the continuous case (one-dimensional diffusions) and ends at the discrete one (birth-death processes). Possible generalization of the results studied here is discussed at the end of the paper 展开更多
关键词 Principal eigenvalue lower estimate variational formula one- dimensional diffusion birth-death process
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Association of CYBA rs7195830 polymorphism with estimated glomerular filtration rate in an adult Han sample from Jiangsu province, China 被引量:1
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作者 FAN Kuan-lu ZHANG Hai-feng +7 位作者 ZHU Zhen-yan YAO Wen-ming SHEN Jie LIANG Ning-xia GONG Lei YIN Zhi-jian CAO Ke-jiang LI Xin-li 《Chinese Medical Journal》 SCIE CAS CSCD 2013年第17期3311-3315,共5页
Background Reactive oxygen species are thought to contribute to the development of renal damage. The P22phox subunit of nicotinamide adenine dinucleotide phosphate (NAPDH) oxidase, encoded by the cytochrome b245a po... Background Reactive oxygen species are thought to contribute to the development of renal damage. The P22phox subunit of nicotinamide adenine dinucleotide phosphate (NAPDH) oxidase, encoded by the cytochrome b245a polypeptide gene, CYBA, plays a key role in superoxide anion production. We investigated the association of CYBA rs7195830 polymorphism with estimated glomerular filtration rate (eGFR) and the role it plays in the pathogenesis of chronic kidney disease (CKD) in a Han Chinese sample. Methods The Gaoyou study enrolled 4473 participants. Serum levels of creatinine were measured and eGFR was estimated using the Chronic Kidney Disease Epidemiology Collaboration equations. The CYBA polymorphisms were genotyped. Then we investigated the association between eGFR and the rs7195830 polymorphism in the recessive model. Results The AA genotype of rs7195830 was associated with significantly lower values of eGFR compared with the GG and AG genotypes ((102.76±17.07) ml.min-1.1.73 m-2 vs. (105.08±16.30) ml'min-1.1.73 m-2). The association remained significant in the recessive model after adjusting for age, gender, body mass index, smoking, hypertension, diabetes mellitus, uric acid, triglyceride, low density lipoprotein cholesterol and high density lipoprotein cholesterol (β=1.666, P=0.031). The rs7195832 AA genotype was an independent risk factor for CKD: eGFR 〈60 ml.min-1.1.73 m-2 (odds ratio=3.32; 95% CI= 1.21-9.13). Conclusion The AA genotype of rs7195830 is independently associated with lower estimated glomerular filtration rate and is significantly associated with CKD. 展开更多
关键词 The AA genotype of rs7195830 is independently associated with lower estimated glomerular filtration rateand is significantly associated with CKD.
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Sample Bound Estimate Based Chance-constrained Immune Optimization and Its Applications 被引量:3
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作者 Zhu-Hong Zhang Kai Yang Da-Min Zhang 《International Journal of Automation and computing》 EI CSCD 2016年第5期468-479,共12页
This work investigates a simple and practical bio-immune optimization approach to solve a kind of chance-constrained programming problem without known noisy attributes, after probing into a lower bound estimate of sam... This work investigates a simple and practical bio-immune optimization approach to solve a kind of chance-constrained programming problem without known noisy attributes, after probing into a lower bound estimate of sample size for any random variable. Such approach mainly consists of sample allocation, evaluation, proliferation and mutation. The former two, depending on a lower bound estimate acquired, not only decide the sample size of random variable and the importance level of each evolving B cell, but also ensure that such B cell is evaluated with low computational cost; the third makes diverse B cells participate in evolution and suppresses the influence of noise; the last, which associates with the information on population diversity and fitness inheritance, creates diverse and high-affinity B cells. Under such approach, three similar immune algorithms are derived after selecting different mutation rules. The experiments, by comparison against two valuable genetic algorithms, have illustrated that these immune algorithms are competitive optimizers capable of effectively executing noisy compensation and searching for the desired optimal reliable solution. 展开更多
关键词 Chance-constrained programming immune optimization sample allocation lower bound estimate noise attenuation
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Lower Bound Estimation of Hardware Resources for Scheduling in High—Level Synthesis 被引量:2
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作者 ShenZhaoxuan ChingChuen 《Journal of Computer Science & Technology》 SCIE EI CSCD 2002年第6期718-730,共13页
In high-level synthesis of VLSI circuits, good lower bound prediction canefficiently narrow down the large space of possible designs. Previous approaches predict the lowerbound by relaxing or even ignoring the precede... In high-level synthesis of VLSI circuits, good lower bound prediction canefficiently narrow down the large space of possible designs. Previous approaches predict the lowerbound by relaxing or even ignoring the precedence constraints of the data flow graph (DFG), andresult in inaccuracy of the lower bound. The loop folding and conditional branch were also notconsidered. In this paper, a new stepwise refinement algorithm is proposed, which takesconsideration of precedence constraints of the DFG to estimate the lower bound of hardware resourcesunder time constraints. Processing techniques to handle multi-cycle, chaining, pipelining, as wellas loop folding and mutual exclusion among conditional branches are also incorporated in thealgorithm. Experimental results show that the algorithm can produce a very tight and close tooptimal lower bound in reasonable computation time. 展开更多
关键词 lower bound estimation CHAINING PIPELINING mutual exclusion high-levelsynthesis
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Convergence analysis of the rectangular Morley element scheme for second order problem in arbitrary dimensions
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作者 MENG XiangYun YANG XueQin ZHANG Shuo 《Science China Mathematics》 SCIE CSCD 2016年第11期2245-2264,共20页
We present the convergence analysis of the rectangular Morley element scheme utilised on the second order problem in arbitrary dimensions. Specifically, we prove that the convergence of the scheme is of (D(h) order... We present the convergence analysis of the rectangular Morley element scheme utilised on the second order problem in arbitrary dimensions. Specifically, we prove that the convergence of the scheme is of (D(h) order in energy norm and of O(h2) order in L2 norm on general d-rectangular triangulations. Moreover, when the triangulation is uniform, the convergence rate can be of O(h2) order in energy norm, and the convergence rate in L2 norm is still of O(h2) order, which cannot be improved. Numerical examples are presented to demonstrate our theoretical results. 展开更多
关键词 d-rectangular Morley element second order elliptic equation convergence analysis super convergence lower bound estimate
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