基于回溯机制的互联网AS拓扑的Betweenness算法

Betweenness能够刻画节点或边在网络中的重要程度.在Internet中,Betweenness直接反应了特定网络拓扑结构下节点或链路可能承载的网络流量,能够对网络的动态行为进行预测.但传统的Be-tweenness计算复杂度较高,为O(n3),但这些算法是为加权网络设计的,而很多实际的网络模型并没有考虑权重.另一方面,目前的算法都没有考虑边的语义,而互联网AS(autonomoussystem)拓扑中的边具有语义.针对简单无权网络提出一种基于回溯的时间复杂度为O(nm)的Betweenness计算方法.在进一步考虑InternetAS拓扑的特殊性,即任意两个相连的AS都具有某种商业关系的基础上提出了互联网AS层拓扑的Betweenness计算方法.

基于流量加权Betweenness提高网络容量的方法

在节点的发包速率和转发包速率都和节点度相关的流量模型中,研究了在基于跳数的最短路径路由策略下网络的容量问题。将Betweenness的概念进行了扩展,提出流量加权Betweenness的概念,使之更准确地描述在每个节点的发包速率各不相同的情况下节点可能承载的流量。并据此推导出适合于该流量模型的网络容量计算公式,同时指出在基于BA算法构造的scale-free网络中,在流量加权Betweenness值处在前5%至10%和前10%至15%的节点间加边的方法能显著提高容量。最后,通过仿真实验验证了该公式的正确性和该方法的有效性。

利用Betweenness Centrality计算网络流量矩阵的新算法

引入Betweenness Centrality中间度核心性作为候选快照的选择指标,特别是以其中的GBC群组中间度核心性作为考量多链路权重改变时各链路的选取问题,实验结果表明,BC的引入加快了秩的提高,而GBC可以衡量群组大小不同时会对原系统产生影响的程度;同时指出将GBC作为唯一指标在实际操作层面存在问题,需要综合考虑其他因素。最后提出将来结合序列RBC与GBC进行计算的研究方向。

Dynamical robustness of networks based on betweenness against multi-node attack

We explore the robustness of a network against failures of vertices or edges where a fraction of vertices is removed and an overload model based on betweenness is constructed.It is assumed that the load and capacity of vertex are correlated with its betweenness centrality B_(i)as B_(i)^(θ)and(1+α)B_(i)^(θ)(θis the strength parameter,αis the tolerance parameter).We model the cascading failures following a local load preferential sharing rule.It is found that there exists a minimal whenθis between 0 and 1,and its theoretical analysis is given.The minimalα_(c)characterizes the strongest robustness of a network against cascading failures triggered by removing a random fraction f of vertices.It is realized that the minimalα_(c)increases with the increase of the removal fraction f or the decrease of average degree.In addition,we compare the robustness of networks whose overload models are characterized by degree and betweenness,and find that the networks based on betweenness have stronger robustness against the random removal of a fraction f of vertices.

Betweenness-based algorithm for a partition scale-free graph

Many real-world networks are found to be scale-free. However, graph partition technology, as a technology capable of parallel computing, performs poorly when scale-free graphs are provided. The reason for this is that traditional partitioning algorithms are designed for random networks and regular networks, rather than for scale-free networks. Multilevel graph-partitioning algorithms are currently considered to be the state of the art and are used extensively. In this paper, we analyse the reasons why traditional multilevel graph-partitioning algorithms perform poorly and present a new multilevel graph-partitioning paradigm, top down partitioning, which derives its name from the comparison with the traditional bottom-up partitioning. A new multilevel partitioning algorithm, named betweenness-based partitioning algorithm, is also presented as an implementation of top-down partitioning paradigm. An experimental evaluation of seven different real-world scale-free networks shows that the betweenness-based partitioning algorithm significantly outperforms the existing state-of-the-art approaches.

利用区域地震资料监测朝鲜地下核试验的研究进展

根据朝鲜6次地下核试验在中国东北及邻近地区产生的宽频带区域地震资料,中国科学院地质与地球物理研究所地震学学科组发展了一套用于监测地下核试验的地震学方法,主要包括震级测量和当量估计、高精度震中定位以及爆炸与天然地震事件识别等.在全球范围内,存在多个用于震级-当量转换的经验公式,确定何种公式适合于朝鲜半岛地区至关重要.通过搜集一组用于地震测深的化学爆炸的当量和埋深,并以这些已知爆炸源作为量规事件,能够标定朝鲜地下核试验场的震级-当量关系,从而实现对朝鲜地下核爆进行当量估计.在精确定位方面,发展了利用多事件之间波形互相关方法精确测定它们之间的走时差从而完成高精度相对震中定位.通过进一步利用Pn和Pg等多震相数据还实现了对核爆深度的相对定位.在爆炸震源识别方面,利用统计处理方法分析研究了不同类型事件所产生地震波的特征,包括6次地下核试验、4次天然地震和3次化学爆炸,以及一些矿区塌陷等.结果发现P和S类型波的振幅比,例如Pn/Lg、Pg/Lg和Pn/Sn等,在2 Hz以上能够较好区分各类震源.其中爆炸震源产生的振幅比显著高于天然地震的值.特别是,通过计算谱振幅比的台网平均值能够显著提高识别的可靠性.利用中国东北和附近地区地震台网所提供的数据可以准确地将朝鲜地下核试验从周边天然地震事件中识别出来.该方法同时得到化学爆炸的P/S谱振幅比值介于核爆炸和天然地震的群组之间.

海外中医药译写专著的“他塑”研究——以Between Heaven and Earth:A Guide to Chinese Medicine为例

基于亚马逊平台热销中医专著Between Heaven and Earth:A Guide to Chinese Medicine (《天地之间:中医指南》),举例分析其巧用“取象比类”思维、借用现代医学术语、采用图示辅助理解、创新中医文化表达的4种译写策略,并借助调查问卷佐证这4种译写策略的有效性与可取性,希望通过借鉴学习“他塑”,完善中医国际形象的“自塑”。同时检查“他塑”出现的文化误读,反观“自塑”的不足,从而调整中医传播策略,促进中医药文化的海外传播。

Study on Over-urbanization of the Ecotone between Mount Tai and Tai'an City

By investigating the ecotone between Mount Tai Scenic Area and downtown area of Tai'an City,the characteristics of such an ecotone are analyzed,serious problems brought by the over-urbanization to local natural environment,such as destruction of eco-environment,aggravated pollution and degradation of mountainous landscape resources are studied.Then countermeasures for the harmonious development of the ecotone are proposed to better promote the coordinated development of cities and mountainous scenic areas.

Study on the Epistemology Development of the Correlation between Human Beings and Nature

This study aimed to alert people that the harmony between human beings and nature has already become an urgent problem. All people are responsible for maintaining the harmony, which is the also the inexorable trend of historical development. Reviewing the evolution history of human kind, the relationship between human beings and nature from harmony to imbalance, from imbalance to a new harmony was analyzed from the macro perspective, and it was pointed out that the present society is in the transitional phase from imbalance to a new harmony and also a phase that people are consciously coordinating their relationship with nature. It was found through the study that a harmonious society relies on the harmony between human beings and nature, and the latter is a necessary condition for a real harmonious society, however, people always forget such a principle. The imbalanced relationship between human beings and nature has seriously influenced many aspects of social harmony, and become instable factors in China and international society, even threatened the development and survival of human beings. Thus, all people should make joint efforts in creating win-win conditions for the development between human beings and nature, and ensuring offspring a healthy and green earth.

认知理论指导下的英语介词习得研究——以介词between和among的认知语义分析为例

英语介词主要表达事物间的相互关系,在句子结构上来说就是一种句式。Between和among句式中各个成分的隐喻使其在英语中广泛应用。在认知理论的指导下,以意象图式为基点,通过研究介词句式的引申机制和辐射网络探讨了理论对英语介词的习得的重要指导作用。

文明叙事:习近平文化思想的方法论审视

文明是中国共产党百余年推进马克思主义中国化时代化的核心线索,文明叙事是中国共产党历史叙事的重要维度,也是习近平文化思想的重要方法论。习近平文化思想的深厚文明意蕴体现在四个方面:一是从历史纵深出发把握“走自己的路”的文明基因,即从中华5000多年文明的历史传承中把握中国道路的来龙去脉及其内在逻辑必然;二是以“第二个结合”为根本方法,重塑发展中华文明的使命担当,不断推动建设中华民族现代文明实现传统文明的现代新生;三是坚守文明超越理念,将新文明的建构与中国式现代化的现实实践相互关联,以中国式现代化创造人类文明新形态,打破西方以资本逻辑为核心的形而上学抽象文明观的历史困境;四是坚持文明交流互鉴,推动落实全球文明倡议,构建人类文明交往新范式。

Study on the "Coexistence between Heaven and Man" Concept and the Chinese Vernacular Architecture Concept

On the basis of the characteristics of ancient Chinese culture,the paper discusses the formation inevitability of the 'Coexistence between Heaven and Man' building concept,the connection and the differences with the ecological concept of modern Chinese Vernacular Architecture.The key point is that the contemporary design should absorb the ancient Chinese culture of the 'Coexistence between Heaven and Man' building concept and the essence of Chinese Vernacular Architecture ecological concept,forming the design features of local ecology based on the environmental protection and harmonious coexistence.

Cultural Differences between English and Chinese on Idioms Origins

Different people from different cultures may have different understandings of the same sentence because they know little about the target cultures. While the ultimate aim of English teaching as a foreign language is to cultivate students' competence to apply English correctly, fluently, and appropriately in cross-cultural communication. Idioms, a part of language, are the essence of culture in every country. Using language in such communication, we often come across some idioms with distinctive cultural characteristics, so it is a very important and complicated thing for us to understand and use these idioms correctly. Therefore, in this paper, we will discuss the idioms reflecting the differences of Chinese and Western cultures in various levels with many lively, important, and interesting examples of idioms.

Influences of Cultural Differences on Interpretation between English and Chinese

This article aims to describe the importance of the cultural background knowledge between English and Chinese when interpret ing.Ignoring the cultural differences may affect the corrections of interpretation.It is a must for interpreters to learn and understand the dif ferent cultures for interpreting.

On the Relationship between the Original and the Translated Version——The Interpretation of Benjamin's Three Metaphors

This paper explores the relationship between the original and its translation by interpreting Benjamin's three metaphors from his The Translator's Task. The exploration starts with the metaphor of"the tangent of a circle",where it is interpreted that although the translated version should be faithful to its original in terms of meaning,yet it is a deviation due to different internal and external factors. Then,in the metaphor of"afterlife",the discussion demonstrates that the translated version proceeds from the original,but the original depends on it for its survival and afterlife in different eras. Later,based on the metaphor of"fragments of a vessel",the author states that the original and its translation are equal and complementary,just like the fragments of a vessel,responsible for the development and renewal of each other through translation. Finally,it is concluded that a better understanding of their relationship can offer us a new perspective in translation studies and practice.

The Thought of the Oneness Between Man and Nature in Walden

From the view of the ecological theory, this paper tries to analyze that Thoreau uses Chinese traditional philosophical thought--- the oneness of man and nature to deal with the relationship of human beings and the nature in Walden.

Nonlinear dynamic behavior of rubbing rotor under interaction between bending and torsional vibrations

The nonlinear dynamic behavior of a rubbing rotor system was studied with a mathematical model established with the eccentricity and interaction between bending and torsional vibrations taken into consideration. The nonlinear vibrational response of a rubbing rotor was analyzed using numerical integral, spectroscopic analysis and Poince mapping method, which made it possible to have better understanding of the vibrational characteristics of partial rubbing and complete circular rubbing rotors. The numerical results reveal the response of torsional vibration mainly takes a form of superchronous motion, and its frequency decreases as the rotational speed increases when partial rubbing occurs, and the response of torsional vibration is synchronous when complete circular rubbing occurs. The comparison of the dynamics of rubbing rotors with and without the interaction between bending and torsional vibrations shows the interaction between bending and torsional vibrations advances the rotational speed, at which the response of bending vibration changes from a synchronous motion into a quasi periodic motion, and the interaction between bending and torsional vibrations reduces stability of the rubbing rotor.

Deformation Characteristics of Loess Landslide along the Contact between Loess and Neocene Red Mudstone

The loess landslide along the contact between loess and Neogene red mudstone (NRM) is one of those that have occurred extensively and frequently in loess areas of China. To better understand the mechanism of this type of landslides, a distressed loess slope being subjected to deformation along the loess-NRM contact was comprehensively investigated through approaches of field monitoring and laboratory physical modeling. Field observation and physical modeling shows that the slope deformation will experience two distinct processes: 1) laterally retrogressive and vertically progressive propagation, which was initiated by falling of the slope head; and 2) retrogressively separate mass sliding along the weak basal zone of the loess-NRM contact with minor sliding along the paleosols within the loess. Shear failure of the loess-NRM contact may initiate in the middle section, followed by a progressive propagation towards the slope toe and inner slope. Analysis reveals that the deformation characteristics of the distressed slope are largely constrained by slope topography, the unique structure, physical and mechanical properties of loess and paleosols, and occurrence and nature of the loess-NRM contact. Rainfall has significantly influence on the deformation characteristics of the slope through its interaction with the loess and soil of the loess-NRM contact. Additionally, improper style and intensity of cutting on the slope greatly enhance and accelerate the deformation course of the slope.