期刊文献+
共找到183篇文章
< 1 2 10 >
每页显示 20 50 100
Iterative convergence theorems for maximal monotone operators and relatively nonexpansive mappings 被引量:5
1
作者 WEI Li SU Yong-fu ZHOU Hai-yun 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2008年第3期319-325,共7页
In this paper, some iterative schemes for approximating the common element of the set of zero points of maximal monotone operators and the set of fixed points of relatively nonexpansive mappings in a real uniformly sm... In this paper, some iterative schemes for approximating the common element of the set of zero points of maximal monotone operators and the set of fixed points of relatively nonexpansive mappings in a real uniformly smooth and uniformly convex Banach space are proposed. Some strong convergence theorems are obtained, to extend the previous work. 展开更多
关键词 maximal monotone operator relatively nonexpansive mapping strong convergence zero point fixed point
在线阅读 下载PDF
MAXIMAL ELEMENTS OF A FAMILY OF G_B-MAJORIZED MAPPINGS IN PRODUCT FC-SPACES AND APPLICATIONS 被引量:2
2
作者 丁协平 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第12期1607-1618,共12页
A new family of GB-majorized mappings from a topological space into a finite continuous topological spaces (in short, FC-space) involving a better admissible set-valued mapping is introduced. Some existence theorems... A new family of GB-majorized mappings from a topological space into a finite continuous topological spaces (in short, FC-space) involving a better admissible set-valued mapping is introduced. Some existence theorems of maximal elements for the family of GB-majorized mappings are proved under noncompact setting of product FCspaces. Some applications to fixed point and system of minimax inequalities are given in product FC-spaces. These theorems improve, unify and generalize many important results in recent literature. 展开更多
关键词 maximal element family of GB-majorized mappings fixed point system of minimax inequalities product FC-space
在线阅读 下载PDF
MAXIMAL ELEMENTS FOR G_B-MAJORIZED MAPPINGS IN PRODUCT G_CONVEX SPACES AND APPLICATIONS (Ⅱ) 被引量:1
3
作者 丁协平 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2003年第9期1017-1024,共8页
A new family of set_valued mappings from a topological space into generalized convex spaces was introduced and studied. By using the continuous partition of unity theorem and Brouwer fixed point theorem, several exist... A new family of set_valued mappings from a topological space into generalized convex spaces was introduced and studied. By using the continuous partition of unity theorem and Brouwer fixed point theorem, several existence theorems of maximal elements for the family of set_valued mappings were proved under noncompact setting of product generalized convex spaces. These theorems improve, unify and generalize many important results in recent literature. 展开更多
关键词 maximal element family of G B_ majorized mappings product G_ convex space
在线阅读 下载PDF
MAXIMAL ELEMENTS FOR G_B-MAJORIZED MAPPINGS IN PRODUCT G-CONVEX SPACES AND APPLICATIONS (Ⅰ) 被引量:1
4
作者 丁协平 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2003年第6期659-672,共14页
A new family of set_valued mappings from a topological space into generalized convex spaces was introduced and studied. By using the continuous partition of unity theorem and Brouwer fixed point theorem, several exist... A new family of set_valued mappings from a topological space into generalized convex spaces was introduced and studied. By using the continuous partition of unity theorem and Brouwer fixed point theorem, several existence theorems of maximal elements for the family of set_valued mappings were proved under noncompact setting of product generalized convex spaces. These theorems improve, unify and generalize many important results in recent literature. 展开更多
关键词 maximal element family of G B_ majorized mappings product G_ convex space
在线阅读 下载PDF
Maximal elements and generalized games involving condensing mappings in locally FC-uniform spaces and applications(Ⅰ)
5
作者 丁协平 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第12期1561-1568,共8页
First, the notions of the measure of noncompactness and condensing setvalued mappings are introduced in locally FC-uniform spaces without convexity structure. A new existence theorem of maximal elements of a family of... First, the notions of the measure of noncompactness and condensing setvalued mappings are introduced in locally FC-uniform spaces without convexity structure. A new existence theorem of maximal elements of a family of set-valued mappings involving condensing mappings is proved in locally FC-uniform spaces. As applications, some new equilibrium existence theorems of generalized game involving condensing mappings are established in locally FC-uniform spaces. These results improve and generalize some known results in literature to locally FC-uniform spaces. Some further applications of our results to the systems of generalized vector quasi-equilibrium problems will be given in a follow-up paper. 展开更多
关键词 condensing set-valued mapping maximal element generalized game equi-librium locally FC-uniform spaces
在线阅读 下载PDF
New iterative schemes for strongly relatively nonexpansive mappings and maximal monotone operators
6
作者 WEI Li SU Yong-fu ZHOU Hai-yun 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2010年第2期199-208,共10页
In this paper, some new iterative schemes for approximating the common element of the set of fixed points of strongly relatively nonexpansive mappings and the set of zero points of maximal monotone operators in a real... In this paper, some new iterative schemes for approximating the common element of the set of fixed points of strongly relatively nonexpansive mappings and the set of zero points of maximal monotone operators in a real uniformly smooth and uniformly convex Banach space are proposed. Some weak convergence theorems are obtained, which extend and complement some previous work. 展开更多
关键词 Strongly relatively nonexpansive mapping maximal monotone operator zero point fixed point weak convergence.
在线阅读 下载PDF
g-η-Monotone mapping and resolvent operator technique for solving generalized implicit variational-like inclusions
7
作者 张清邦 丁协平 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第1期11-18,共8页
A new class of g-η-monotone mappings and a class of generalized implicit variational-like inclusions involving g-η-monotone mappings are introduced. The resolvent operator of g-η-monotone mappings is defined and it... A new class of g-η-monotone mappings and a class of generalized implicit variational-like inclusions involving g-η-monotone mappings are introduced. The resolvent operator of g-η-monotone mappings is defined and its Lipschitz continuity is presented, An iterative algorithm for approximating the solutions of generalized implicit wriational- like inclusions is suggested and analyzed. The convergence of iterative sequences generated by the algorithm is also proved, 展开更多
关键词 g-η-monotone mapping resolvent operator generalized implicit variational-like inclusion iterative algorithm
在线阅读 下载PDF
Proximal point algorithm for a new class of fuzzy set-valued variational inclusions with (H,η)-monotone mappings
8
作者 李红刚 《Journal of Chongqing University》 CAS 2008年第1期79-84,共6页
We introduced a new class of fuzzy set-valued variational inclusions with (H,η)-monotone mappings. Using the resolvent operator method in Hilbert spaces, we suggested a new proximal point algorithm for finding approx... We introduced a new class of fuzzy set-valued variational inclusions with (H,η)-monotone mappings. Using the resolvent operator method in Hilbert spaces, we suggested a new proximal point algorithm for finding approximate solutions, which strongly converge to the exact solution of a fuzzy set-valued variational inclusion with (H,η)-monotone. The results improved and generalized the general quasi-variational inclusions with fuzzy set-valued mappings proposed by Jin and Tian Jin MM, Perturbed proximal point algorithm for general quasi-variational inclusions with fuzzy set-valued mappings, OR Transactions, 2005, 9(3): 31-38, (In Chinese); Tian YX, Generalized nonlinear implicit quasi-variational inclusions with fuzzy mappings, Computers & Mathematics with Applications, 2001, 42: 101-108. 展开更多
关键词 variational inclusion (H η)-monotone mapping resolvent operator technique fuzzy set-valued mapping proximal point algorithm: convergence of numerical methods
在线阅读 下载PDF
MAXIMAL ELEMENTS OF CONDENSING PREFERENCE MAPS IN LOCALLY CONVEX HAUSDORFF SPACES
9
作者 丁协平 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1991年第8期741-744,共4页
Two existence theorems of maximal elements of condensing preference maps in locally convex Hausdorff spaces are proved which generalize the recent results of Mehta. One of them positively answers the open problem ment... Two existence theorems of maximal elements of condensing preference maps in locally convex Hausdorff spaces are proved which generalize the recent results of Mehta. One of them positively answers the open problem mentioned by Mehta. 展开更多
关键词 topological vector space condensing preference map maximal element
在线阅读 下载PDF
COINCIDENCE THEOREMS INVOKING COMPOSITES OF ACYCLIC MAPPINGS AND APPLICATIONS 被引量:2
10
作者 丁协平 《Acta Mathematica Scientia》 SCIE CSCD 1999年第1期53-61,共9页
Some new coincidence theorems involving a new class of set-valued mappingscontaining composites of acyclic mappings defined on a contractible space are proved.As applications, some existence theorems of maximal elemen... Some new coincidence theorems involving a new class of set-valued mappingscontaining composites of acyclic mappings defined on a contractible space are proved.As applications, some existence theorems of maximal elements and solutions of abstract variational inequalities, and best approximation theorems are proved. These theorems improve and generalize a number of known results in recent literature. 展开更多
关键词 Coincidence theorem maximal element variational inequality best approximation contractible space composites of acyclic mappings
在线阅读 下载PDF
Some Surjectivity Theorems for Maximal Monotone Operators and Its Application
11
作者 WU Yue-xiang WANG La-di 《Chinese Quarterly Journal of Mathematics》 CSCD 北大核心 2008年第4期615-620,共6页
The main purpose of this paper is to study the surjectivity theorems for maximal monotone mapping in reflexive Banach spaces by using fixed point theory. We prove some new surjectivity theorems under some conditions a... The main purpose of this paper is to study the surjectivity theorems for maximal monotone mapping in reflexive Banach spaces by using fixed point theory. We prove some new surjectivity theorems under some conditions and give its application in differential equation. 展开更多
关键词 maximal monotone mapping surjectivity theorems nonlinear equation
在线阅读 下载PDF
基于MAP-EM算法的双能CT直接迭代基材料分解方法 被引量:2
12
作者 周正东 章栩苓 +3 位作者 辛润超 贾峻山 魏士松 毛玲 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2020年第5期935-941,共7页
为了提高双能CT基材料分解的精度,降低基材料图像的噪声,提出了基于MAP-EM算法的直接迭代基材料分解方法.结合MAP-EM算法,推导出基材料分解直接迭代求解公式,基于双能投影数据集直接重建基材料分解图像,并对该方法的性能进行了评价和分... 为了提高双能CT基材料分解的精度,降低基材料图像的噪声,提出了基于MAP-EM算法的直接迭代基材料分解方法.结合MAP-EM算法,推导出基材料分解直接迭代求解公式,基于双能投影数据集直接重建基材料分解图像,并对该方法的性能进行了评价和分析.仿真结果表明,所提方法可显著降低分解误差和基材料图像噪声,提高对比噪声比.与基于FBP算法的图像域基材料分解方法相比,该方法可使基材料图像中各材料区域的噪声水平下降57.42%~63.64%,分解误差水平降低31.72%~62.14%,对比噪声比提高1.37%~223.17%. 展开更多
关键词 双能CT 基材料分解 map-EM 直接迭代 图像重建
在线阅读 下载PDF
不确定图上的极大团枚举及高效验证算法
13
作者 赵丹枫 吕闫妍 +2 位作者 张文博 黄冬梅 高峰 《智能系统学报》 CSCD 北大核心 2024年第6期1539-1551,共13页
现有的不确定图中极大团枚举方法“子图划分—枚举—验证”,在处理大规模图时,整体效率不高;当挖掘出的伪极大团数量较多时,验证速率明显下降。因此,提出高效枚举及验证算法(multiple inversion list enumerate uncertain maximal cliqu... 现有的不确定图中极大团枚举方法“子图划分—枚举—验证”,在处理大规模图时,整体效率不高;当挖掘出的伪极大团数量较多时,验证速率明显下降。因此,提出高效枚举及验证算法(multiple inversion list enumerate uncertain maximal cliques,MILEUMC)。在子图划分和枚举前,定义并构造概率阈值(α)不确定图,通过缩小图的规模,提高枚举效率;在“验证”时,提出基于多重倒排表的验证方法,分为去重复和去包含关系2个阶段去除伪极大团,以不同索引构建各个阶段的多重倒排表,根据极大团的属性完成验证,同时动态更新相应的倒排表和映射表,以减小工作量,提高时间效率。最后在多个真实的数据集上比较,结果验证了MILEUMC算法的高效性。该算法更适用于在较为稀疏的图上寻找联系更紧密的极大团。 展开更多
关键词 不确定图 极大团 数据挖掘 枚举算法 验证算法 子图划分 倒排表 映射表
在线阅读 下载PDF
拟变分包含及不动点问题公解的算法 被引量:11
14
作者 张石生 李向荣 陈志坚 《应用数学和力学》 CSCD 北大核心 2008年第5期515-524,共10页
介绍了一种新的迭代算法,在Hilbert空间的框架下,用以寻求具多值极大单调映象和逆-强单调映象的变分包含的解集与非扩张映象的不动点集的公共元.在适当的条件下,逼近于这一公共元的某些强收敛定理被证明.所得结果是新的,它不仅改进和推... 介绍了一种新的迭代算法,在Hilbert空间的框架下,用以寻求具多值极大单调映象和逆-强单调映象的变分包含的解集与非扩张映象的不动点集的公共元.在适当的条件下,逼近于这一公共元的某些强收敛定理被证明.所得结果是新的,它不仅改进和推广了Korpelevich[Ekonomika iMatematicheskie Metody,1976,12(4):747-756]的结果,而且也推广和改进了Iiduka和Takahashi[Non-linear Anal,TMA,2005,61(3):341-350],Takahashi和Toyoda[J OptimTheory Appl,2003,118(2):417-428],Nadezhkina和Takahashi[J Optim Theory Appl,2006,128(1):191-201]及Zeng和Yao[TaiwaneseJournal of Mathematics,2006,10(5):1293-1303]等人的最新结果. 展开更多
关键词 变分包含 多值极大单调映象 逆.强单调映象 度量投影 不动点 非扩张映象
在线阅读 下载PDF
环Fq+uFq+…+u^k-1Fq上一类重根常循环码 被引量:14
15
作者 朱士信 李平 吴波 《电子与信息学报》 EI CSCD 北大核心 2008年第6期1394-1396,共3页
记R=F_q+uF_q+…+u^(k-1)F_q,G=R[x]/<x^t-α>,且λ是R中可逆元。定义了从G^n到R^tn的新的Gray映射φ,证明了J是G上长为n的线性的x-常循环码当且仅当φ(J)是R上长为tn的线性的α-常循环码。使用有限环理论,获得了环R上长为p^e的... 记R=F_q+uF_q+…+u^(k-1)F_q,G=R[x]/<x^t-α>,且λ是R中可逆元。定义了从G^n到R^tn的新的Gray映射φ,证明了J是G上长为n的线性的x-常循环码当且仅当φ(J)是R上长为tn的线性的α-常循环码。使用有限环理论,获得了环R上长为p^e的所有的(uλ-1)-常循环码的结构及其码字个数。特别地,获得了环F2m+uF上长为2~e的(uλ-1)-常循环码的对偶码的结构及其码字个数。推广了环2aZ上重根负循环码的若干结果。 展开更多
关键词 重根常循环码 GRAY映射 极大理想 有限链环
在线阅读 下载PDF
Terra MODIS第5波段红外遥感影像条带噪声的探测与校正 被引量:4
16
作者 王荣彬 曾超 +1 位作者 姜湾 李平湘 《红外与激光工程》 EI CSCD 北大核心 2013年第1期273-277,共5页
由于TerraMODIS传感器第5波段(1.230~1.250I,zm)中部分探测元件出现故障,从而导致整幅影像上存在明显的条带噪声。对于地理校正后的MODIS影像数据,其条带噪声的分布并不是完全规则的,还可能存在不连续的现象,加大了对噪声进行... 由于TerraMODIS传感器第5波段(1.230~1.250I,zm)中部分探测元件出现故障,从而导致整幅影像上存在明显的条带噪声。对于地理校正后的MODIS影像数据,其条带噪声的分布并不是完全规则的,还可能存在不连续的现象,加大了对噪声进行处理的难度。提出一种对条带噪声进行检测与去除的方法,首先利用局部梯度对条带噪声的位置进行探测。然后在基于最大后验概率的框架下结合噪声模型与Huber—Markov先验,并通过梯度下降算法进行噪声的去除。使用真实的遥感数据进行了实验,所展示的恢复后数据和对应的频谱图都证明了文中方法的有效性。 展开更多
关键词 条带噪声 检测 去除条带噪声 Terra卫星 MODIS 最大后验
在线阅读 下载PDF
关于L_s优化映象的极大元存在定理 被引量:5
17
作者 邓磊 杜艳梅 唐净熔 《西南师范大学学报(自然科学版)》 CAS CSCD 北大核心 2005年第4期589-593,共5页
给出了LS类映象和LS优化映象的概念,在G凸空间中建立了关于LS类映象和LS优化映象的极大元存在定理.作为应用,给出了G凸空间中的极大极小不等式.
关键词 G-凸空间 Ls类映象 Ls优化映象 极大元
在线阅读 下载PDF
基于效用最大化的网络跨层映射 被引量:6
18
作者 李世勇 杨冬 +1 位作者 秦雅娟 张宏科 《软件学报》 EI CSCD 北大核心 2011年第8期1855-1871,共17页
基于网络效用最大化的思想研究了网络跨层映射,给出了应用层的服务映射到传输层的多个连接再映射到网络层的多条路径的多对多映射的数学模型,指出了映射的目标就是合理地为源端用户分配路径传输能力,从而使用户的聚合效用达到最优.针对... 基于网络效用最大化的思想研究了网络跨层映射,给出了应用层的服务映射到传输层的多个连接再映射到网络层的多条路径的多对多映射的数学模型,指出了映射的目标就是合理地为源端用户分配路径传输能力,从而使用户的聚合效用达到最优.针对该映射模型,为了得到各个用户的最优带宽分配,提出了一种分布式算法.该算法是渐进稳定的,且平衡点就是映射模型的最优点.仿真结果验证了算法的收敛性.另外,理论分析了映射机制的安全性和可靠性,分别给出了当网络中存在侦听和分布式攻击时,服务能够成功完成的概率.仿真结果表明,多对多映射确实提高了数据传输的安全性和可靠性. 展开更多
关键词 下一代互联网 网络效用最大化 多连接 多路径 映射
在线阅读 下载PDF
基于小波域层次Markov模型的图像分割 被引量:12
19
作者 李旭超 朱善安 朱胜利 《中国图象图形学报》 CSCD 北大核心 2007年第2期308-314,共7页
针对两个状态的有限高斯混合模型逼近小波系数的不足和小波域隐马尔可夫树标号场相互独立的缺点,提出了一种基于小波域层次马尔可夫模型的图像分割算法,这种模型用有限通用混合模型逼近小波系数的分布,使有限高斯混合模型只是其一种特... 针对两个状态的有限高斯混合模型逼近小波系数的不足和小波域隐马尔可夫树标号场相互独立的缺点,提出了一种基于小波域层次马尔可夫模型的图像分割算法,这种模型用有限通用混合模型逼近小波系数的分布,使有限高斯混合模型只是其一种特殊情况;在标号场的先验模型确定上,利用马尔可夫模型描述标号场的局部作用关系,给出标号场的具体表达式,克服了小波域马尔可夫树模型标号场相互独立的不足,然后利用贝叶斯准则,给出相应的分割因果算法。该模型不仅具有空域马尔可夫模型有效的递归算法的优点,同时具有小波域隐马尔可夫树模型中的马尔可夫参数变尺度行为。最后用真实的图像和合成图像同几种分割方法进行了对比实验,实验结果表明了本文算法的有效性和优异性。 展开更多
关键词 小波域马尔可夫随机场 最大后验概率 图像分割 EM算法
在线阅读 下载PDF
不动点问题和零点问题的公共元的具误差的迭代算法 被引量:6
20
作者 高兴慧 马乐荣 《西南师范大学学报(自然科学版)》 CAS CSCD 北大核心 2014年第10期9-12,共4页
在自反的严格凸的具有K-K性质的光滑Banach空间中,设计了一种新的具误差的投影算法,用以逼近拟φ-非扩张映射的不动点集和极大单调算子的零点集的公共元素,并利用所设计的算法证明了公共元的强收敛定理.作为应用,给出寻找凸泛函的极小... 在自反的严格凸的具有K-K性质的光滑Banach空间中,设计了一种新的具误差的投影算法,用以逼近拟φ-非扩张映射的不动点集和极大单调算子的零点集的公共元素,并利用所设计的算法证明了公共元的强收敛定理.作为应用,给出寻找凸泛函的极小值问题. 展开更多
关键词 具误差的迭代算法 φ 非扩张映射 极大单调算子
在线阅读 下载PDF
上一页 1 2 10 下一页 到第
使用帮助 返回顶部