含表决系统的网络联络矩阵的一种降阶方法

为了解决含有表决子系统的网络系统在转化为网络图时增加大量重复弧和重复节点,使网络的联络矩阵变为一个高阶稀疏矩阵的问题,提出了一种降阶方法.此法针对该稀疏矩阵的特点进行分块,使表决子系统对应于分块矩阵中的一个矩阵块;引入矩阵的对角乘法算子和对角还原算子,对表决子系统对应的矩阵块进行独立运算.运算结果表明,该方法使联络矩阵明显降阶.

网络教学联络质量效用分析

网络教学联络的自由给各类学习者提供了弹性学习模式,也给传统教育制度提出了新课题。本文对网络教学联络质量效用进行了详细分析,以期对网络教学工作有所借鉴。

基于供电能力的配电网联络有效性评价与化简方法

最大供电能力(TSC)是衡量配电网建设水平的一个新指标,而网络联络是影响TSC的一个关键因素。针对网络联络对TSC的贡献程度进行了研究,提出了基于TSC的配电网联络有效性定义,并由网络转移能力的灵敏度给出了单个联络有效度和联络组合有效度的计算公式。针对配电网联络日益复杂的现实情况,从满足N-1安全约束下发挥配电网TSC的角度出发,提出了基于联络有效性的配电网联络化简方法。最后,通过实际配电网算例验证了所述方法的有效性,并归纳出配电网联络有效性的一些重要规律。

一种计算网络两点间最小路集的方法

基于网络联络矩阵 ,提出一种计算网络两点间最小路集的方法 ,并给出严格的证明。该方法把网络的广义联络矩阵划去输入节点对应的列和输出节点对应的行后 ,将网络分析中路的计算转化为矩阵行列式的运算。适用于任何有向、无向和混合网络。

基于大型会议活动中信息联络工作的研究与思考

大型会议活动是企业影响力传播的重要载体,是企业品牌塑造的重要平台,是企业维护客户关系、拓展市场的重要手段。随着企业的不断发展壮大,国内外业务交往不断增多,企业所承担的会议和活动任务日趋繁重。特别是规模大、规格高、影响深远的大型会议活动将直接影响企业的知名度和美誉度。

创建煤矿单轨吊辅助运输网络化的探析

山东能源新矿集团赵官能源有限责任公司为了适应矿井单轨吊运输网络化扩展,从优化巷道布置入手,合理组织施工,进一步提高单进水平,保证了采区接续,实现了单轨吊安全高效运输。

脚踏实地,多做实事,力争新突破——中国图书评论学会常务理事和《中国图书评论》编委联席会纪要

1990年12月23日,中国图书评论学会常务理事会和《中国图书评论》编委会在中宣部会议室举行联席会议,听取了学会秘书处和《中国图书评论》编辑部一年来的工作情况,研究了1990年工作计划和活动安排。中宣部干部局局长、中国图书评论学会会长、本刊主编伍杰同志主持了联席会,全国出版工作者协会副主席、本刊主编许力以,国家新闻出版署副署长、中国图书评论学会副会长刘杲。

大有可为的妇女事工——云南之行的感想

我有幸作为全国两会“专委办”(“专门委员会办事组”简称)同工前往昆明参加云南省妇女事工委员会举办的首届联络员培训班工作。感谢神使我有机会接触和了解云南教会,并与云南教会的肢体在基督的爱里结下深厚的情谊。10天的相处并不太长,但云南之行留给我的记忆却非常之深。

国际信息

日前，日本NEC继在北京、k海、广州设立办事处后，又在深圳设立了大陆境内的第四间力、事处。

即时通信路路通

随着现在即时通信软件（AM）战的烽烟四起，大家都有点不知所从，同时每一款即时软件都有其优点与不足，因而更让我们无从适应，即时通信软件究竟该如何击挑选。

KRBKSS: a keyword relationship based keyword-set search system for peer-to-peer networks

may incur significant bandwidth for executing more com- plicated search queries such as multiple-attribute queries. In order to reduce query overhead, KSS (keyword-set search) by Gnawali partitions the index by a set of keywords. However, a KSS index is considerably larger than a standard inverted index, since there are more word sets than there are individual words. And the insert overhead and storage overhead are obviously un- acceptable for full-text search on a collection of documents even if KSS uses the distance window technology. In this paper, we extract the relationship information between query keywords from websites’ queries logs to improve performance of KSS system. Experiments results clearly demonstrated that the improved keyword-set search system based on keywords relationship (KRBKSS) is more efficient than KSS index in insert overhead and storage overhead, and a standard inverted index in terms of communication costs for query.

Synthesis of indirect work exchange networks considering both isothermal and adiabatic process together with exergy analysis

In this paper, an efficient methodology for synthesizing the indirect work exchange networks(WEN) considering isothermal process and adiabatic process respectively based on transshipment model is first proposed. In contrast with superstructure method, the transshipment model is easier to obtain the minimum utility consumption taken as the objective function and more convenient for us to attain the optimal network configuration for further minimizing the number of units. Different from division of temperature intervals in heat exchange networks,different pressure intervals are gained according to the maximum compression/expansion ratio in consideration of operating principles of indirect work exchangers and the characteristics of no pressure constraints for stream matches. The presented approach for WEN synthesis is a linear programming model applied to the isothermal process, but for indirect work exchange networks with adiabatic process, a nonlinear programming model needs establishing. Additionally, temperatures should be regarded as decision variables limited to the range between inlet and outlet temperatures in each sub-network. The constructed transshipment model can be solved first to get the minimum utility consumption and further to determine the minimum number of units by merging the adjacent pressure intervals on the basis of the proposed merging methods, which is proved to be effective through exergy analysis at the level of units structures. Finally, two cases are calculated to confirm it is dramatically feasible and effective that the optimal WEN configuration can be gained by the proposed method.

Function chain neural network prediction on heat transfer performance of oscillating heat pipe based on grey relational analysis

As for the factors affecting the heat transfer performance of complex and nonlinear oscillating heat pipe (OHP),grey relational analysis (GRA) was used to deal with the relationship between heat transfer rate of a looped copper-water OHP and charging ratio,inner diameter,inclination angel,heat input,number of turns,and the main influencing factors were defined.Then,forecasting model was obtained by using main influencing factors (such as charging ratio,interior diameter,and inclination angel) as the inputs of function chain neural network.The results show that the relative average error between the predicted and actual value is 4%,which illustrates that the function chain neural network can be applied to predict the performance of OHP accurately.

THE PN2I NETWORK: A SCALABLE BANYAN NETWORK

To design a Banyan network with an arbitrary even-sized port number, the PN2I network is proposed. The PN2I network can be divided into two classes: the complete and incomplete versions. A simple routing algorithm is given, but in the incomplete PN2I networks,this routing algorithm fails to make the traffic in links even, which deteriorates the performance badly. Thus a new routing algorithm is proposed, which makes the incomplete PN2I networks behave almost the same as the PN2I networks with respect to the performance issues.

Changing Connectivities of Chinese Cities in the World City Network,2010–2016

Against the backdrop of the sizable economic growth of China in recent years, this paper uses the most recent data gathering of the Globalization and World Cities(Ga WC) research network to update and supplement earlier research on the shifting global connectivity of Chinese cities. The update consists of an evaluation of the connectivity of Chinese cities in 2016, the supplement of an analysis of the changing position of Chinese cities in the world city network between 2010 and 2016. To this end, we build on a specification of the world city network as an ‘interlocking network' in which producer services firms play the crucial role in city network formation. Information about the presence of leading producer services firms in cities in 2010 and 2016 is used as the input to a bipartite network projection algorithm in order to measure cities' network connectivity. The first set of results discusses the geographies of urban connectivity in the world city network in 2016. The second set of results discusses standardized measures of change to reveal the major dimensions of the transformations between 2010 and 2016. We find that, with the exception of Hong Kong, Macao and Kaohsiung of Taiwan, all Chinese cities record connectivity gains. This wholesale rise in connectivity is nonetheless geographically uneven, with above all Beijing, Chengdu/Chongqing and Changsha/Wuhan becoming more connected. We conclude that the wholesale rise of Chinese cities in the world city network and their changing trajectories in the post-crisis era are embedded in shifting external and internal political economies.

Efficient Broadcast Retransmission Based on Network Coding for InterPlaNetary Internet

In traditional wireless broadcast networks,a corrupted packet must be retransmitted even if it has been lost by only one receiver.Obviously,this is not bandwidth-efficient for the receivers that already hold the retransmitted packet.Therefore,it is important to develop a method to realise efficient broadcast transmission.Network coding is a promising technique in this scenario.However,none of the proposed schemes achieves both high transmission efficiency and low computational complexity simultaneously so far.To address this problem,a novel Efficient Opportunistic Network Coding Retransmission(EONCR)scheme is proposed in this paper.This scheme employs a new packet scheduling algorithm which uses a Packet Distribution Matrix(PDM)directly to select the coded packets.The analysis and simulation results indicate that transmission efficiency of EONCR is over 0.1,more than the schemes proposed previously in some simulation conditions,and the computational overhead is reduced substantially.Hence,it has great application prospects in wireless broadcast networks,especially energyand bandwidth-limited systems such as satellite broadcast systems and Planetary Networks(PNs).

Research on the Security of the United Storage Network Based on NAS

A multi-user view file system (MUVFS) and a security scheme are developed to improve the security of the united storage network (USN) that integrates a network attached storage (NAS) and a storage area network (SAN). The MUVFS offers a storage volume view for each authorized user who can access only the data in his own storage volume, the security scheme enables all users to encrypt and decrypt the data of their own storage view at client-side, and the USN server needs only to check the users’ identities and the data’s integrity. Experiments were performed to compare the sequential read, write and read/write rates of NFS+MUVFS+secure_module with those of NFS. The results indicate that the security of the USN is improved greatly with little influence on the system performance when the MUVFS and the security scheme are integrated into it.

On Effective Virtual Networks Interconnection

The network services today require extremely agile and mobile, however, the traditional IP infrastructures are so rigid that cannot fit services well. A way should be put forward to automate the network to improve responsiveness to change. SDN and network virtualization(NV) are two hottest approaches to make networking more automated and scalable to support virtualized and cloud environments. Network virtualization combines hardware and software network resources and network functionality into a single virtual network. SDN is created to simplify traffic management and achieve operational efficiencies by establish and exercising central control over packet forwarding. In this paper, we focus on the situation where SDN controller needs to connect two virtual networks temporarily. We put forward three algorithms to try to make this connection more effective and evaluate these three algorithms.