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Iterative convergence theorems for maximal monotone operators and relatively nonexpansive mappings 被引量:5
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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
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MAXIMAL ELEMENTS OF A FAMILY OF G_B-MAJORIZED MAPPINGS IN PRODUCT FC-SPACES AND APPLICATIONS 被引量:2
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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
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MAXIMAL ELEMENTS FOR G_B-MAJORIZED MAPPINGS IN PRODUCT G_CONVEX SPACES AND APPLICATIONS (Ⅱ) 被引量:1
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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
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MAXIMAL ELEMENTS FOR G_B-MAJORIZED MAPPINGS IN PRODUCT G-CONVEX SPACES AND APPLICATIONS (Ⅰ) 被引量:1
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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
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Maximal elements and generalized games involving condensing mappings in locally FC-uniform spaces and applications(Ⅰ)
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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
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New iterative schemes for strongly relatively nonexpansive mappings and maximal monotone operators
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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.
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g-η-Monotone mapping and resolvent operator technique for solving generalized implicit variational-like inclusions
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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
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Proximal point algorithm for a new class of fuzzy set-valued variational inclusions with (H,η)-monotone mappings
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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
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MAXIMAL ELEMENTS OF CONDENSING PREFERENCE MAPS IN LOCALLY CONVEX HAUSDORFF SPACES
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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
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COINCIDENCE THEOREMS INVOKING COMPOSITES OF ACYCLIC MAPPINGS AND APPLICATIONS 被引量:2
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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
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Some Surjectivity Theorems for Maximal Monotone Operators and Its Application
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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
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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
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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
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拟变分包含及不动点问题公解的算法 被引量:11
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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
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环Fq+uFq+…+u^k-1Fq上一类重根常循环码 被引量:14
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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
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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
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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
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关于L_s优化映象的极大元存在定理 被引量:5
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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
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基于效用最大化的网络跨层映射 被引量:6
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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
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基于小波域层次Markov模型的图像分割 被引量:12
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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
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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
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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
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空间金字塔分解的深度可视化方法 被引量:2
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作者 陶攀 付忠良 +1 位作者 朱锴 王莉莉 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2017年第11期60-65,共6页
针对基于深度卷积神经网络的图像分类模型的可解释性问题,通过评估模型特征空间的潜在可表示性,提出一种用于改善理解模型特征空间的可视化方法.给定任何已训练的深度卷积网络模型,所提出的方法在依据原输入图像使得模型类别得分激活最... 针对基于深度卷积神经网络的图像分类模型的可解释性问题,通过评估模型特征空间的潜在可表示性,提出一种用于改善理解模型特征空间的可视化方法.给定任何已训练的深度卷积网络模型,所提出的方法在依据原输入图像使得模型类别得分激活最大化时,首先对反向传播的梯度进行归一化操作,然后采用带动量的随机梯度上升训练策略,反向回传修改原输入图像.引入了通过激活最大化获得的图像可解释性的正则化方法,常规正则化技术不能主动调整模型特征空间的潜在可表示性,结合现有正则化方法提出空间金字塔分解方法,利用构建多层拉普拉斯金字塔主动提升目标图像特征空间的低频分量,结合多层高斯金字塔调整其特征空间的高频分量得到较优可视化效果.通过限制可视化区域,提出利用类别显著性激活图技术加以压制上下文无关信息,可进一步改善可视化效果.对模型学习到的不同类别和卷积层中单独的神经元进行合成可视化实验,实验结果表明提出的方法在不同的深度模型和不同的可视化任务中均能取得较优的可视化效果. 展开更多
关键词 深度可视化 金字塔分解 激活最大化 卷积神经网络 激活图
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