检索结果-南通市图书馆

Primal-dual Interior-point Algorithms for Second-order Cone Optimization Based on a New Parametric Kernel Function

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第11期23卷 2027-2042页

作者： Yan qin bai Guo Qiang WANG Department of Mathematics College of Sciences Shanghai University Shanghai 200444 P. R. China College of Vocational Technology Shanghai University of Engineering Science Shanghai 200437 P. R. China

A class of polynomial primal-dual interior-point algorithms for second-order cone optimization based on a new parametric kernel function, with parameters p and q, is presented. Its growth term is between linear and quadratic. Some new tools for the analysis of the algorithms are proposed. The complexity bounds of O（√Nlog N log N/ε） for large-update methods and O（√Nlog N/ε） for smallupdate methods match the best known complexity bounds obtained for these methods. Numerical tests demonstrate the behavior of the algorithms for different results of the parameters p and q.

关键词： second-order cone optimization linear optimization interior-point methods large- and small-update methods polynomial-time complexity

A Kind of Unified Strict Efficiency via Improvement Sets in Vector Optimization

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2018年第4期6卷 557-569页

作者： Hui Guo Yan-qin bai Department of Mathematics Chongqing Normal UniversityChongqing 401331China College of Sciences Shanghai UniversityShanghai 200444China

In this paper,we propose a kind of unified strict efficiency named E-strict efficiency via improvement sets for vector *** kind of efficiency is shown to be an extension of the classical strict efficiency andε-strict efficiency and has many desirable *** also discuss some relationships with other properly efficiency based on improvement sets and establish the corresponding scalarization theorems by a base-functional and a nonlinear ***,some examples are given to illustrate the main conclusions.

关键词： E-strict efficiency Improvement sets Linear scalarization Nonlinear scalarization Vector optimization

A New Kernel Function Yielding the Best Known Iteration Bounds for Primal-Dual Interior-Point Algorithms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第12期25卷 2169-2178页

作者： Yan qin bai Jin LiGUO Cornelis ROOS Department of Mathematics Shanghai University Shanghai 200436 P. R. China Business School University of Shanghai for Science and Technology Shanghai 200093 P. R. China Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology P.O. Box 5031 2600 GA Delft The Netherlands

Kernel functions play an important role in defining new search directions for primal-dual interior-point algorithm for solving linear optimization problems. In this paper we present a new kernel function which yields ... 详细信息

关键词： linear optimization interior-point method primal-dual method large-update method polynomial complexity

Alternating Direction Method of Multipliers for l_(1)-l_(2)-Regularized Logistic Regression Model

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2016年第2期4卷 243-253页

作者： Yan-qin bai Kai-Ji Shen Department of Mathematics Shanghai UniversityShanghai 200444China

Logistic regression has been proved as a promising method for machine learning,which focuses on the problem of *** this paper,we present anl_(1)-l_(2)-regularized logistic regression model,where thel1-norm is responsible for yielding a sparse logistic regression classifier and thel_(2)-norm for keeping betlter classification *** solve thel_(1)-l_(2)-regularized logistic regression model,we develop an alternating direction method of multipliers with embedding limitedlBroyden-Fletcher-Goldfarb-Shanno(L-BFGS)***,we implement our model for binary classification problems by using real data examples selected from the University of California,Irvine Machines Learning Repository(UCI Repository).We compare our numerical results with those obtained by the well-known LIBSVM and SVM-Light *** numerical results show that ourl_(1)-l_(2)-regularized logisltic regression model achieves better classification and less CPU Time.

关键词： Classification problems Logistic regression model Sparsity Alternating direction method of multipliers

Effect of Heat Treatment on Structure and Electrochemical Properties of Electro-deposited Ni-P Amorphous Alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

材料热处理学报 2004年第05B期25卷 1163-1165页

作者： GUOJin-biao WANGYu LIHui-qin SUNDong-bai BeijingUniversityofScienceandTechnology Beijing.China

The influences of heat treatment time on structure and the electrochemical behavior of electro-deposited amorphous Ni-P alloy coating were studied. The results show that the as-plated deposits have an amorphous structure, and the deposits crystallize into Ni12P5 and Ni3P at 260 °C, and the corrosion resistance of the as-plated deposits are better than that of the deposits after heat treatment.

关键词：热处理 Ni-P非晶形合金电化学电解沉积

Anti-corrosion mechanism of epoxy-resin and different content Fe2O3 coatings on magnesium alloy

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2016年第4期10卷 367-374页

作者： TaoJlN Fan-mei KONG Rui-qin bai Ru-liang ZHANG College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China College of Earth Science and Engineering Shandong University of Science and Technology Qingdao 266590 China

In this study, anti-corrosion coatings were prepared and coated success- fully on magnesium alloy substrates by mixing nanopowders, solvent, curing agent with epoxy resin. The effect of the amount of iron trioxide （Fe2O3） on the adhesion strength and corrosion resistance on magnesium alloy was investigated with standard protocols, and electrochemical measurements were also made in 3.5 wt.% NaCl solutions. The surface morphology and corrosion mechanism after corrosion tests was characterized using FESEM analysis. Nanoparticies in matrix acted as filler, and interstitial cross-linked spaces and other coating artifacts regions （micro cracks and voids） would all affect the anti-corrosion properties of coating. The results showed the proper powder content not only provided adhesion strength to these coatings but also improved obviously their anticorrosion. Hydrogen bound to the amine nitrogen （1N） could take part in the curing process rather than hydrogen of the amide site due to the smaller AG and the more stable configuration.

关键词： magnesium alloy corrosion iron trioxide anti-corrosion mechanism

Experimental Study on Wear Performance and Oil Film Characteristics of Surface Textured Cylinder Liner in Marine Diesel Engine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2018年第3期31卷 158-167页

作者： Zhi-Wei Guo Cheng-qing Yuan Xiu-qin bai Xin-Ping Yan Reliability Engineering Institute National Engineering Research Center for Water Transportation Safety Key Laboratory of Marine Power Engineering&Technology(Ministry of Transport) Wuhan University of Technology

It is of a vital importance to reduce the frictional losses in marine diesel engines. Advanced surface textures have provided an e ective solution to friction performance of rubbing pairs due to the rapid development of surface engineering techniques. However,the mechanisms through which textured patterns and texturing methods prove beneficial remains unclear. To address this issue,the tribological system of the cylinder liner?piston ring(CLPR) is investigated in this work. Two types of surface textures(Micro concave,Micro V?groove) are processed on the cylinder specimen using di erent processing methods. Comparative study on the friction coe cients,worn surface texture features and oil film characteristics are performed. The results demonstrate that the processing method of surface texture a ect the performance of the CLPR pairs under the specific testing conditions. In addition the micro V?groove processed by CNCPM is more favorable for improving the wear performances at the low load,while the micro?con?cave processed by CE is more favorable for improving the wear performances at the high load. These findings are in helping to understand the e ect of surface texture on wear performance of CLPR.

关键词： Cylinder liner?piston ring(CLPR) Surface texture structure Frictional and wear characteristic Oil film characteristic

Quadratic Kernel-Free Least Square Twin Support Vector Machine for Binary Classification Problems

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2019年第4期7卷 539-559页

作者： Qian-Qian Gao Yan-qin bai Ya-Ru Zhan Department of Mathematics Shanghai UniversityShanghaiChina

In this paper,a new quadratic kernel-free least square twin support vector machine(QLSTSVM)is proposed for binary classification *** advantage of QLSTSVM is that there is no need to select the kernel function and related parameters for nonlinear classification *** using consensus technique,we adopt alternating direction method of multipliers to solve the reformulated consensus QLSTSVM *** reduce CPU time,the Karush-Kuhn-Tucker(KKT)conditions is also used to solve the *** performance of QLSTSVM is tested on two artificial datasets and several University of California Irvine(UCI)benchmark *** results indicate that the QLSTSVM may outperform several existing methods for solving twin support vector machine with Gaussian kernel in terms of the classification accuracy and operation time.

关键词： Twin support vector machine Quadratic kernel-free Least square Binary classification

A Primal-Dual Interior-Point Method for Optimal Grasping Manipulation of Multi-fingered Hand-Arm Robots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2017年第2期5卷 177-192页

作者： Yan-qin bai Xue-Rui Gao Chang-Jun Yu Department of Mathematics Shanghai UniversityShanghai 200444China

In this paper,we consider an optimization problem of the grasping manipulation of multi-fingered hand-arm *** first formulate an optimization model for the problem,based on the dynamic equations of the object and the friction con***,we reformulate the model as a convex quadratic programming over circular ***,we propose a primal-dual interior-point algorithm based on the kernel function to solve this convex quadratic programming over circular *** derive both the convergence of the algorithm and the iteration bounds for largeand small-update methods,***,we carry out the numerical tests of 180◦and 90◦manipulations of the hand-arm robot to demonstrate the effectiveness of the proposed algorithm.

关键词： Grasping manipulation Circular cone programming Primal-dual interior-point algorithm Numerical tests