两类图的W-宽直径

图的直径与宽直径是并行与分布式网络通信延迟的度量,据此研究了两类图的W-宽直径,在n点圈Cn中添加t条边得到图C(n,t),讨论了图C(n,t)的2-宽直径的最小值问题,并得到其上下界,进而提出了h(n,t)精确取值的猜想;在分析联图连通度的基础上,导出了联图的W-宽直径上界估计式。     

文思缜密结构紧凑--Edward VIII辞职演说语篇联结分析

本文从语篇分析的视角,通过对英王EdwardVIII辞职演说的剖析,强调语篇联结手段对于形成连贯语篇的重要作用,指出各种联结手段的合理使用,能使语篇更具说服力、感染力.     

The Use of Treatment Concurrences to Assess Robustness of Binary Block Designs Against the Loss of Whole Blocks

Criteria are proposed for assessing the robustness of a binary block design against the loss of whole blocks, based on summing entries of selected upper non‐principal sections of the concurrence matrix. These criteria improve on the minimal concurrence concept that has been used previously and provide new conditions for measuring the robustness status of a design. The robustness properties of two‐associate partially balanced designs are considered and it is shown that two categories of group divisible designs are maximally robust. These results expand a classic result in the literature, obtained by Ghosh, which established maximal robustness for the class of balanced block designs.     

Social creativity as a function of agent cognition and network properties: A computer model

Inventions – concepts, devices, procedures – are often created by networks of interacting agents in which the agents can be individuals (as in a scientific discipline) or they can themselves be collectives (as in firms interacting in a market). Different collectives create and invent at different rates. It is plausible that the rate of invention is jointly determined by properties of the agents (e.g., their cognitive capacity) and by properties of the network of interactions (e.g., the density of the communication links), but little is known about such two-level interactions. We present an agent-based model of social creativity in which the individual agent captures key features of the human cognitive architecture derived from cognitive psychology, and the interactions are modeled by agents exchanging partial results of their symbolic processing of task information. We investigated the effect of agent and network properties on rates of invention and diffusion in the network via systematic parameter variations. Simulation runs show, among other results, that (a) the simulation exhibits network effects, i.e., the model captures the beneficial effect of collaboration; (b) the density of connections produces diminishing returns in term of the benefits on the invention rate; and (c) limits on the cognitive capacity of the individual agents have the counterintuitive consequence of focusing their efforts. Limitations and relations to other computer simulation models of creative collectives are discussed.     

多环芳烃的性质与拓扑指数关系的研究Ⅳ多环芳烃的致癌性与二阶分子连接性指数的相关性

以双区理论为基础 ,提出了多环芳烃的致癌性与其二阶分子连接性指数之间的定量关系方程 ,并利用该方程计算了 72个多环芳烃的致癌性 ,计算值与实验值吻合     

Approximation algorithms and hardness results for labeled connectivity problems

Let G=(V,E) be a connected multigraph, whose edges are associated with labels specified by an integer-valued function ℒ:E→ℕ. In addition, each label ℓ∈ℕ has a non-negative cost c(ℓ). The minimum label spanning tree problem (MinLST) asks to find a spanning tree in G that minimizes the overall cost of the labels used by its edges. Equivalently, we aim at finding a minimum cost subset of labels I⊆ℕ such that the edge set {e∈E:ℒ(e)∈I} forms a connected subgraph spanning all vertices. Similarly, in the minimum label s – t path problem (MinLP) the goal is to identify an s–t path minimizing the combined cost of its labels. The main contributions of this paper are improved approximation algorithms and hardness results for MinLST and MinLP.     

柴油机喷油嘴测控系统融合实训室建设研究

在柴油机喷油嘴测控系统使用过程中,不同的终端、软件系统、算法体系等方面存在差异,成为其融合(互联互通)的一大阻碍,因此迫切需要一个平台来保证互联互通工作的顺利运行。依托现有校企合作协同创新基地,借助立项的省市级科技计划研究平台,开展柴油机喷油嘴测控系统融合实训室的建设与实践。通过阐明实训室的建设目的与工作定位,提出实训室具体建设方案,并从测试平台、管理制度以及人才队伍建设等方面进行探讨。在建设发展中,实训室为柴油机喷油嘴测控系统的融合提供测试等服务,取得了初步的成效。     

对一类最小图的研究

对一个与并行结构和通信网络设计密切相关的图论公开性问题进行了研究。讨论了图的结点数为n,连通度至少为k,k-直径至多为d的条件下的最小图问题,给出了一般条件下最小图边数条数的上、下界,在此基础上,得到了两种条件下最小图边数的计算公式,结合已有的图论结果,对文中所提到的最小图进行了构造。     

含氮杂环化合物的QSPR/QSAR研究

研究了含氮杂环化合物的疏水性参数lgP和对淡水纤毛虫的毒性lgC与其价连接性指数之间的定量关系 ,相关性良好 .结果表明计算值与实验值吻合     

拟正则图的最大线图连通度及其应用

引入了拟正则(p,q)图的最大线图连通度R(p,q),得到上、下界至多相差1的R(p,q)的取值范围:2m-2相似文献