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S. K. Zavriev 《Journal of Global Optimization》1993,3(1):67-78
The paper is devoted to the convergence properties of finite-difference local descent algorithms in global optimization problems with a special -convex structure. It is assumed that the objective function can be closely approximated by some smooth convex function. Stability properties of the perturbed gradient descent and coordinate descent methods are investigated. Basing on this results some global optimization properties of finite-difference local descent algorithms, in particular, coordinate descent method, are discovered. These properties are not inherent in methods using exact gradients.The paper was presented at the II. IIASA-Workshop on Global Optimization, Sopron (Hungary), December 9–14, 1990. 相似文献
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S. K. Zavriev 《Journal of Optimization Theory and Applications》1996,91(1):185-214
The steepest-descent technique dealing with the perturbed values of the objective function and its gradients and with nonexact line searches is considered. Attention is given to the case where the perturbations do not decrease on the algorithm trajectories; the aim is to investigate how perturbations at every iteration of the algorithm perturb its original attractor set.Based on the Liapunov direct method for attraction analysis of discrete-time processes, a sharp estimation of the attractor set generated by a perturbed steepest-descent technique with respect to the perturbation magnitudes is obtained. Some global optimization properties of finite-difference analogues of the gradient method are discovered. These properties are not inherent in methods which use exact gradients.The author is grateful to the referees for many useful suggestions. 相似文献
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Translated from Vychislitel'nye Kompleksy i Modelirovanie Slozhnykh Sistem, pp. 117–124, Moscow State University, 1989. 相似文献
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We present a unified framework for convergence analysis of generalized subgradient-type algorithms in the presence of perturbations. A principal novel feature of our analysis is that perturbations need not tend to zero in the limit. It is established that the iterates of the algorithms are attracted, in a certain sense, to an -stationary set of the problem, where depends on the magnitude of perturbations. Characterization of the attraction sets is given in the general (nonsmooth and nonconvex) case. The results are further strengthened for convex, weakly sharp, and strongly convex problems. Our analysis extends and unifies previously known results on convergence and stability properties of gradient and subgradient methods, including their incremental, parallel, and heavy ball modifications. 相似文献
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S. K. Zavriev 《Computational Mathematics and Modeling》1992,3(1):39-43
Translated from Vychislitel'nye Kompleksy i Modelirovanie Slozhnykh Sistem, pp. 111–117, Moscow State University, 1989. 相似文献
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S. K. Zavriev 《Computational Mathematics and Modeling》1993,4(3):294-297
Translated from Programmnoe Obespechenie i Modeli Sistemnogo Analiza, pp. 161–165, 1991. 相似文献
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Ryazantsev DY Tsybulsky DA Prokhorenko IA Kvach MV Martynenko YV Philipchenko PM Shmanai VV Korshun VA Zavriev SK 《Analytical and bioanalytical chemistry》2012,404(1):59-68
A typical TaqMan? real-time PCR probe contains a 5'-fluorescent dye and a 3'-quencher. In the course of the amplification, the probe is degraded starting from the 5'-end, thus releasing fluorescent dye. Some fluorophores (including fluorescein) are known to be prone to self-quenching when located near each other. This work is aimed at studying dye-dye and dye-quencher interactions in multiply modified DNA probes. Twenty-one fluorogenic probes containing one and two fluoresceins (FAM), or a FAM-JOE pair, and one or two BHQ1 quenchers were synthesized using non-nucleoside reagents and "click chemistry" post-modification on solid phase and in solution. The probes were tested in real-time PCR using an ~300-bp-long natural DNA fragment as a template. The structural prerequisites for lowering the probe background fluorescence and increasing the end-plateau fluorescence intensity were evaluated and discussed. 相似文献
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The global optimization problem is considered under the assumption that the objective function is convex with respect to some variables. A finite subgradient algorithm for the search of an -optimal solution is proposed. Results of numerical experiments are presented. 相似文献