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Möbius Disjointness for Distal Flows in Short Intervals
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作者 Ke WANG 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2022年第9期1512-1522,共11页
We prove the M?bius disjointness conjecture in short intervals for a class of skew products on the 2-torus,which includes Furstenberg’s example of irregular flows.
关键词 M?bius disjointness exponential sums
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A hybrid attention deep learning network for refined segmentation of cracks from shield tunnel lining images 被引量:2
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作者 Shuai Zhao Guokai Zhang +2 位作者 Dongming Zhang Daoyuan Tan Hongwei Huang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第12期3105-3117,共13页
This research developed a hybrid position-channel network (named PCNet) through incorporating newly designed channel and position attention modules into U-Net to alleviate the crack discontinuity problem in channel an... This research developed a hybrid position-channel network (named PCNet) through incorporating newly designed channel and position attention modules into U-Net to alleviate the crack discontinuity problem in channel and spatial dimensions. In PCNet, the U-Net is used as a baseline to extract informative spatial and channel-wise features from shield tunnel lining crack images. A channel and a position attention module are designed and embedded after each convolution layer of U-Net to model the feature interdependencies in channel and spatial dimensions. These attention modules can make the U-Net adaptively integrate local crack features with their global dependencies. Experiments were conducted utilizing the dataset based on the images from Shanghai metro shield tunnels. The results validate the effectiveness of the designed channel and position attention modules, since they can individually increase balanced accuracy (BA) by 11.25% and 12.95%, intersection over union (IoU) by 10.79% and 11.83%, and F1 score by 9.96% and 10.63%, respectively. In comparison with the state-of-the-art models (i.e. LinkNet, PSPNet, U-Net, PANet, and Mask R–CNN) on the testing dataset, the proposed PCNet outperforms others with an improvement of BA, IoU, and F1 score owing to the implementation of the channel and position attention modules. These evaluation metrics indicate that the proposed PCNet presents refined crack segmentation with improved performance and is a practicable approach to segment shield tunnel lining cracks in field practice. 展开更多
关键词 Crack segmentation Crack disjoint problem U-net Channel attention Position attention
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Construction of Non-Symmetric Balanced Incomplete Block Design through Combination of Symmetric Disjoint Balanced Incomplete Block Designs
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作者 Troon John Benedict Onyango Fredrick +1 位作者 Karanjah Anthony Njuguna Edward 《Open Journal of Statistics》 2023年第6期789-802,共14页
The existence of several non-symmetric balanced incomplete block designs (BIBDs) is still unknown. This is because the non-existence property for non-symmetric BIBDs is still not known and also the existing constructi... The existence of several non-symmetric balanced incomplete block designs (BIBDs) is still unknown. This is because the non-existence property for non-symmetric BIBDs is still not known and also the existing construction methods have not been able to construct these designs despite their design parameters satisfying the necessary conditions for the existence of BIBD. The study aimed to bridge this gap by introducing a new class of non-symmetric BIBDs. The proposed class of BIBDs is constructed through the combination of disjoint symmetric BIBDs. The study was able to determine that the total number of disjoint symmetric BIBDs (n) with parameters (v = b, r = k, λ) that can be obtained from an un-reduced BIBD with parameters (v, k) is given by n = r - λ. When the n symmetric disjoint BIBDs are combined, then a new class of symmetric BIBDs is formed with parameters v<sup>*</sup><sup> </sup>= v, b<sup>*</sup><sup> </sup>= nb, r<sup>*</sup><sup> </sup>= nr, k<sup>*</sup><sup> </sup>= k, λ<sup>*</sup><sup> </sup>= λ, where 2≤ n ≤ r - λ. The study established that the non-existence property of this class of BIBD was that when is not a perfect square then v should be even and when v<sup>*</sup><sup> </sup>is odd then the equation should not have a solution in integers x, y, z which are not all simultaneously zero. In conclusion, the study showed that this construction technique can be used to construct some non-symmetric BIBDs. However, one must first construct the disjoint symmetric BIBDs before one can construct the non-symmetric BIBD. Thus, the disjoint symmetric BIBDs must exist first before the non-symmetric BIBDs exist. 展开更多
关键词 Disjoint Symmetric BIBD Un-Reduced BIBD COMBINATION Symmetric BIBD Non-Symmetric BIBD Non-Existence of BIBD
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可证明安全的节点不相交多路径源路由协议 被引量:9
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作者 冯涛 郭显 +1 位作者 马建峰 李兴华 《软件学报》 EI CSCD 北大核心 2010年第7期1717-1731,共15页
多路径路由实现是移动ad hoc网络可靠运行的有效保证.针对多路径路由协议的安全性分析,建立了基于UC(universally composable)框架的可证明安全路由协议的新方法.基于攻陷的网络拓扑模型,扩展了可模糊路由概念,提出了多路径可模糊路由... 多路径路由实现是移动ad hoc网络可靠运行的有效保证.针对多路径路由协议的安全性分析,建立了基于UC(universally composable)框架的可证明安全路由协议的新方法.基于攻陷的网络拓扑模型,扩展了可模糊路由概念,提出了多路径可模糊路由集合概念,用于描述攻陷网络拓扑结构的移动ad hoc网络多路径路由;基于UC安全模型,提出了基于UC-RP(universally composable security framework for ad hoc networks routing protocol)框架的路由协议形式化安全定义;针对MNDP(multiple node-disjoint paths)协议存在的安全问题,提出了新的移动ad hoc网络节点不相交多路径动态源路由协议(简记为SMNDP(security multiple node-disjoint paths)协议).将基于UC-RP框架的可证明安全路由协议的新方法应用于SMNDP协议的安全分析.SMNDP协议的可证明安全性可以归约为消息认证码和签名机制的安全性.SMNDP协议实现了路由发现协议的正确性、节点身份的认证性和路由消息的完整性. 展开更多
关键词 ad HOC 网络 MNDP(multiple node—disjoint paths) 可证明安全 可模糊路由 SMNDP(security MULTIPLE node—disjoint paths)
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一种基于多值逻辑的开放式逻辑软件设计方法 被引量:11
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作者 韩江洪 陆阳 +1 位作者 张维勇 蒋建国 《计算机学报》 EI CSCD 北大核心 1997年第7期640-647,共8页
在工业控制系统中,将对逻辑测控过程的表述抽象成多值逻辑是一种准确而又便利的方法,同时,测控过程的多样性又使传统的利用程序设计语言中逻辑语句的软件设计方法很难适应对开放性的要求.本文提出一种适合多值逻辑处理的数据结构和... 在工业控制系统中,将对逻辑测控过程的表述抽象成多值逻辑是一种准确而又便利的方法,同时,测控过程的多样性又使传统的利用程序设计语言中逻辑语句的软件设计方法很难适应对开放性的要求.本文提出一种适合多值逻辑处理的数据结构和代数系统,并以此为基础,构造逻辑描述式,实现组合多值逻辑和时序多值逻辑的开放式设计. 展开更多
关键词 多值逻辑 数据结构 开放性 Disjoint代数
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Integration of Lab model and EHOG for human appearance matching across disjoint camera views 被引量:2
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作者 杨彪 林国余 张为公 《Journal of Southeast University(English Edition)》 EI CAS 2012年第4期422-427,共6页
The integration of the Lab model with the extended histogram of oriented gradients (EHOG) is proposed to improve the accuracy of human appearance matching across disjoint camera views under perturbations such as ill... The integration of the Lab model with the extended histogram of oriented gradients (EHOG) is proposed to improve the accuracy of human appearance matching across disjoint camera views under perturbations such as illumination changes and different viewing angles. For the Lab model that describes the global information of observations, a sorted nearest neighbor clustering method is proposed for color clustering and then a partitioned color matching method is used to calculate the color similarity between observations. The Bhattacharya distance is employed for the textural similarity calculation of the EHOG which describes the local information. The global information, which is robust to different viewing angles and scale changes, describes the observations well. Meanwhile, the use of local information, which is robust to illumination changes, can strengthen the discriminative ability of the method. The integration of global and local information improves the accuracy and robustness of the proposed matching approach. Experiments are carried out indoors, and the results show a high matching accuracy of the proposed method. 展开更多
关键词 human appearance matching Lab model extended histogram of oriented gradients (EHOG) disjoint camera views
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Calculation connectivity reliability of road networks based on recursive decomposition arithmetic 被引量:2
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作者 潘艳荣 邓卫 《Journal of Southeast University(English Edition)》 EI CAS 2008年第1期85-89,共5页
In order to decrease the calculation complexity of connectivity reliability of road networks, an improved recursive decomposition arithmetic is proposed. First, the basic theory of recursive decomposition arithmetic i... In order to decrease the calculation complexity of connectivity reliability of road networks, an improved recursive decomposition arithmetic is proposed. First, the basic theory of recursive decomposition arithmetic is reviewed. Then the characteristics of road networks, which are different from general networks, are analyzed. Under this condition, an improved recursive decomposition arithmetic is put forward which fits road networks better. Furthermore, detailed calculation steps are presented which are convenient for the computer, and the advantage of the approximate arithmetic is analyzed based on this improved arithmetic. This improved recursive decomposition arithmetic directly produces disjoint minipaths and avoids the non-polynomial increasing problems. And because the characteristics of road networks are considered, this arithmetic is greatly simplified. Finally, an example is given to prove its validity. 展开更多
关键词 recursive decomposition arithmetic road network connectivity reliability disjoint minipath topological structure
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一种关于数据流区间Disjoint查询的快速处理算法 被引量:1
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作者 王少鹏 闻英友 +1 位作者 李志 赵宏 《计算机研究与发展》 EI CSCD 北大核心 2014年第5期1136-1148,共13页
在关于数据流子序列相似性匹配的研究中,Disjoint查询是很重要的一类,在传感网络和数据挖掘等方面都发挥着非常重要的作用.但现有的研究并没有关注到定长区间上的Disjoint查询问题.直接对每个区间内成员使用Spring算法是解决该问题的NA... 在关于数据流子序列相似性匹配的研究中,Disjoint查询是很重要的一类,在传感网络和数据挖掘等方面都发挥着非常重要的作用.但现有的研究并没有关注到定长区间上的Disjoint查询问题.直接对每个区间内成员使用Spring算法是解决该问题的NAIVE算法,但是因为NAIVE算法不具有增量计算的特点,所以存在冗余运算.针对NAIVE算法冗余运算的处理问题,提出了边界路径技术.边界路径技术很好地使用了Spring算法在相邻前一区间上的执行结果,使得Spring算法无需对当前区间上每个成员执行,就可以得到Disjoint查询在该区间的查询结果.使用该技术对NAIVE算法进行改造,设计并实现了快速区间Disjoint查询处理算法(fast section Disjoint query processing algorithm,FSDQ),该算法具有增量计算的特点.实验证明FSDQ算法可以有效减少NAIVE算法所具有的冗余运算,是处理数据流上区间Disjoint查询的有效方法. 展开更多
关键词 Disjoint查询 欧氏距离 动态时间弯曲 数据流 Spring算法
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句法不确定性与诗词翻译——以红楼梦柳絮词为例 被引量:3
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作者 刘雪芹 《广西民族大学学报(哲学社会科学版)》 CSSCI 北大核心 2007年第4期146-150,共5页
翻译的不确定性源自意义的不确定性和指称的不可测知性。诗词的多值性给了读者充裕的想象空间,而翻译的过程却要将这种多值化解为单值。针对这一点提出在翻译意象并置引起的不确定性时,可以采用DT(disjointed translation)模式;在其他... 翻译的不确定性源自意义的不确定性和指称的不可测知性。诗词的多值性给了读者充裕的想象空间,而翻译的过程却要将这种多值化解为单值。针对这一点提出在翻译意象并置引起的不确定性时,可以采用DT(disjointed translation)模式;在其他情况下,要利用互确定性和诗性思维对原诗词进行分析,用音乐性的节奏或对意象的操控来消减"多值-单值"的损失,同时赋予诗作以新生。 展开更多
关键词 诗词翻译 不确定性 互确定性 DT(disjointed translation)
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Parallel Computation of Disjoint Products Approach
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作者 刘景森 李捷 《Chinese Quarterly Journal of Mathematics》 CSCD 2002年第3期41-48,共8页
In this paper, extracting parallelizatio n from the sum of disjoint products approach is discussed. A general framework of parallelizing disjoint products approach is presented. And a parallel version of the newest... In this paper, extracting parallelizatio n from the sum of disjoint products approach is discussed. A general framework of parallelizing disjoint products approach is presented. And a parallel version of the newest disjoint products algorithm is implemented. The results of testing s how the effect is so good to get linear speedups. 展开更多
关键词 sum of disjoint products PARALLELIZATION relia bility evaluation
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ON THE MAXIMAL DISJOINT SYSTEM IN Riesz ALGEBRAS AND REPRESENTATION
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作者 徐景峰 熊洪允 《Transactions of Tianjin University》 EI CAS 1999年第1期85-87,共3页
Let E be an Archimedean Riesz algebra possessing a weak unit element e and a maximal disjoint system {e,: i∈I} in which e, is a projection element for each i. The principal band generated by eiis denoted by B(ei). T... Let E be an Archimedean Riesz algebra possessing a weak unit element e and a maximal disjoint system {e,: i∈I} in which e, is a projection element for each i. The principal band generated by eiis denoted by B(ei). The main result in this paper says that if there exists a completely regular Hausdorff space X such that E is Riesz algebra isomorphic to C(X) then for every i ∈ I there exists a completely regular Hausdorff space X, such that B(ei) is Riesz algebra isomorphic to C(Xi). Under an additional condition the inverse holds. 展开更多
关键词 Riesz algebra maximal disjoint system REPRESENTATION projection element weak unit element
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一种滑动窗口下数据流Disjoint查询的增量处理算法 被引量:2
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作者 王少鹏 闻英友 +1 位作者 赵宏 孟颍辉 《计算机学报》 EI CSCD 北大核心 2017年第10期2381-2403,共23页
对于滑动窗口下不具有全局约束机制的数据流Disjoint查询精确处理问题进行了研究,在现有FSM算法基础上提出了一种具有增量计算特征的查询处理算法DQPIC.该算法使用FSM算法处理第一个窗口中的数据流成员,同时保留了该窗口上的查询结果和... 对于滑动窗口下不具有全局约束机制的数据流Disjoint查询精确处理问题进行了研究,在现有FSM算法基础上提出了一种具有增量计算特征的查询处理算法DQPIC.该算法使用FSM算法处理第一个窗口中的数据流成员,同时保留了该窗口上的查询结果和窗口所对应STWM的最后一个列向量,除此之外还需要保留窗口STWM中所有列向量第curbound.highest个成员DTW路径的起始位置、距离值以及该成员在STWM中对应列向量的dmin值和候选查询结果这些信息.从第二个窗口开始,继续使用FSM算法处理窗口成员,同时也保留和第一个窗口一样的信息.在这个过程中,当处理相邻窗口中相同数据流成员时,通过比较该成员在前后两个窗口中分别对应的保留信息是否相同,可以确定算法有无继续处理剩余相同数据流成员的必要,能够在前一个窗口查询结果基础上增量地获得当前窗口查询结果.基于公用数据样本SST与Maskedchirp的仿真实验验证了该算法的有效性.提出的算法与现有其他算法执行结果相同,在空间开销增加1.12~3.27倍情况下,可以实现时间效率2.5~25倍的提高,对于与大窗口下的Disjoint查询相关应用场景,具有更好的时间效果. 展开更多
关键词 数据流 动态时间扭曲 Disjoint查询 滑动窗口 增量计算
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A disjoint algorithm for seismic reliability analysis of lifeline networks 被引量:1
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作者 Han Yang Dalian University of Technology,Dalian 116023,China SUN Shaoping Beijing Municipal Engineering Research Institute,Beijing 100037,China Senior Engineer 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2002年第2期207-212,共6页
The algorithm is based on constructing a disjoin kg t set of the minimal paths in a network system.In this paper, cubic notation was used to describe the logic function of a network in a well-balanced state,and then t... The algorithm is based on constructing a disjoin kg t set of the minimal paths in a network system.In this paper, cubic notation was used to describe the logic function of a network in a well-balanced state,and then the sharp-product operation was used to construct the disjoint minimal path set of the network.A computer program has been developed,and when combined with decomposition technology,the reliability of a general lifeline network can be effectively and automatically calculated. 展开更多
关键词 LIFELINE network reliability disjoint product DFS algorithms logic function sharp-product
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On the Gracefulness of Graph(jC_(4n))∪P_m 被引量:1
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作者 ZHANG ZHI-SHANG ZHANG QING-CHENG WANG CHUN-YUE 《Communications in Mathematical Research》 CSCD 2011年第2期139-146,共8页
The present paper deals with the gracefulness of unconnected graph (jC_(4n))∪P_m,and proves the following result:for positive integers n,j and m with n≥1,j≥2,the unconnected graph(jC_(4n))∪P_m is a gracef... The present paper deals with the gracefulness of unconnected graph (jC_(4n))∪P_m,and proves the following result:for positive integers n,j and m with n≥1,j≥2,the unconnected graph(jC_(4n))∪P_m is a graceful graph for m=j-1 or m≥n+j,where C_(4n) is a cycle with 4n vertexes,P_m is a path with m+1 vertexes,and(jC_(4n))∪P_m denotes the disjoint union of j-C_(4n) and P_m. 展开更多
关键词 graceful labeling graceful graph PATH CYCLE disjoint union
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On the Direct Limit of Simple Artinian Rings 被引量:1
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作者 邵淞春 《Chinese Quarterly Journal of Mathematics》 CSCD 1989年第1期91+87-90,共5页
假设Ⅰ是一个正向指标集,R_i是Artin单环,i∈Ⅰ,{R_i,p^i_f}是Ⅰ上一个正向系统。容易知道,正向极限lim R_i并非一定是一个Artin单环。本文证明了定理假设正向指标集Ⅰ是可数集合,令{R_i,~i_f}是一个 Artin单环的正向系统。那么,R=lim ... 假设Ⅰ是一个正向指标集,R_i是Artin单环,i∈Ⅰ,{R_i,p^i_f}是Ⅰ上一个正向系统。容易知道,正向极限lim R_i并非一定是一个Artin单环。本文证明了定理假设正向指标集Ⅰ是可数集合,令{R_i,~i_f}是一个 Artin单环的正向系统。那么,R=lim R_i是一个本原环。并且求得 l.gl.dimR≤1, 即R=limR_i还是一个遗传环。 展开更多
关键词 正向极限 ARTIN 本原环 遗传环 可数集合 指标集 rings DISJOINT 数学季刊 UNION
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Disjoint双线性规划的一个混合整数线性规划变换及其应用
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作者 齐海强 郑芳英 罗和治 《浙江理工大学学报(自然科学版)》 2022年第4期596-600,共5页
针对disjoint双线性规划问题,给出了一个混合整数线性规划变换方法,以求得其全局最优解。该方法将disjoint双线性规划变换为一个带有互补约束的线性规划,并利用0-1变量和大M法线性化互补约束。同时,将该方法应用于金融系统中的不确定性... 针对disjoint双线性规划问题,给出了一个混合整数线性规划变换方法,以求得其全局最优解。该方法将disjoint双线性规划变换为一个带有互补约束的线性规划,并利用0-1变量和大M法线性化互补约束。同时,将该方法应用于金融系统中的不确定性系统性风险估计问题,证明了该问题可变换为一个disjoint双线性规划问题,进而利用所提出的方法求解。数值结果表明:提出的方法能有效找到中大规模最坏情形系统性风险估计问题的全局最优解,并优于已有的全局解方法。 展开更多
关键词 双线性规划 混合整数线性规划 DISJOINT 全局最优解
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DISJOINT SUPERCYCLIC WEIGHTED PSEUDO-SHIFTS ON BANACH SEQUENCE SPACES
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作者 Ya WANG Yu-Xia LIANG 《Acta Mathematica Scientia》 SCIE CSCD 2019年第4期1089-1102,共14页
In this article, we present several equivalent conditions ensuring the disjoint supercyclicity of finite weighted pseudo-shifts acting on an arbitrary Banach sequence space.The disjoint supercyclic properties of weigh... In this article, we present several equivalent conditions ensuring the disjoint supercyclicity of finite weighted pseudo-shifts acting on an arbitrary Banach sequence space.The disjoint supercyclic properties of weighted translations on locally compact discrete groups,the direct sums of finite classical weighted backward shifts, and the bilateral backward operator weighted shifts can be viewed as special cases of our main results. Furthermore, we exhibit an interesting fact that any finite bilateral weighted backward shifts on the space ?~2(Z) never satisfy the d-Supercyclicity Criterion by a simple proof. 展开更多
关键词 DISJOINT supercyclicity WEIGHTED pseudo-shifts DISJOINT Blow-up/collapse Property
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An improved recursive decomposition algorithm for reliability evaluation of lifeline networks
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作者 Liu Wei Li Jie 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2009年第3期409-419,共11页
The seismic reliability evaluation of lifeline networks has received considerable attention and been widely studied. In this paper, on the basis of an original recursive decomposition algorithm, an improved analytical... The seismic reliability evaluation of lifeline networks has received considerable attention and been widely studied. In this paper, on the basis of an original recursive decomposition algorithm, an improved analytical approach to evaluate the seismic reliability of large lifeline systems is presented. The proposed algorithm takes the shortest path from the source to the sink of a network as decomposition policy. Using the Boolean laws of set operation and the probabilistic operation principal, a recursive decomposition process is constructed in which the disjoint minimal path set and the disjoint minimal cut set are simultaneously enumerated. As the result, a probabilistic inequality can be used to provide results that satisfy a prescribed error bound. During the decomposition process, different from the original recursive decomposition algorithm which only removes edges to simplify the network, the proposed algorithm simplifies the network by merging nodes into sources and removing edges. As a result, the proposed algorithm can obtain simpler networks. Moreover, for a network owning s-independent components in its component set, two network reduction techniques are introduced to speed up the proposed algorithm. A series of case studies, including an actual water distribution network and a large urban gas system, are calculated using the proposed algorithm. The results indicate that the proposed algorithm provides a useful probabilistic analysis method for the seismic reliability evaluation of lifeline networks. 展开更多
关键词 lifeline system network reliability path-based recursive decomposition algorithm disjoint minimal path disjoint minimal cut network reduction reliability bound
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Variations and Absolute Continuity of Set Functions on T_∞-tribe
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作者 王锋叶 张强 《Journal of Beijing Institute of Technology》 EI CAS 2009年第3期375-378,共4页
some properties of the inclusion variation and the disjoint variation of set functions on T∞-tribe are studied in detail.The absolute continuity and singularity of set functions on T∞-tribe are discussed.The triangu... some properties of the inclusion variation and the disjoint variation of set functions on T∞-tribe are studied in detail.The absolute continuity and singularity of set functions on T∞-tribe are discussed.The triangular norms T∞ and S∞ are considered as the operators of intersection and union between the fuzzy sets.As a result,some important conclusions about the variations and absolute continuity of set functions on T∞-tribe are obtained such as the superadditivity of inclusion variation,the relation between the variations and the equivalence proposition of absolute continuity of set functions on T∞-tribe.In addition,two small mistakes about T∞-measure are pointed out by the counterexamples and are revised. 展开更多
关键词 fuzzy measure absolute continuity inclusion variation disjoint variation triangular norms
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FINITENESS OF HIGHER CODIMENSIONAL DISJOINT MINIMAL GRAPHS
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作者 东瑜昕 嵇庆春 张玮 《Acta Mathematica Scientia》 SCIE CSCD 2010年第1期107-112,共6页
We estimate the number of disjoint open subsets in Rn, which can support area-decreasing minimal graphs. This result generalizes the related results of Li-Wang and Tkachev for minimal hypersurfaces to higher codimensi... We estimate the number of disjoint open subsets in Rn, which can support area-decreasing minimal graphs. This result generalizes the related results of Li-Wang and Tkachev for minimal hypersurfaces to higher codimensional case. 展开更多
关键词 area-decreasing volume estimate disjoint minimal graph
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