一种微博用户情感影响者发现模型

情感在微博网络中传播并感染用户,对微博网络甚至现实世界都有重要影响.发现具有情感影响力的用户(情感影响者)对社会管理或制定市场策略等具有重要意义.本文建立了包含两种节点(用户,微博)和三种关系(转发,关注,发帖)的异质微博网络,利用微博情感相似性和用户情感行为相似性将其转化为只包含用户节点的同质网络,进而在该网络中使用随机游走模型发现情感影响者.贡献包含以下方面:利用微博情感相似性和用户的情感行为相似性验证了本文所构建微博网络的情感同配性,确认了情感影响在该网络中存在;提出EmotionRank模型用以寻找情感影响者;基于微博数据的实验结果有效验证了该模型的有效性和优越性.     

基于多特征融合的微博用户权威度定量评价方法

微博用户权威度是评价微博信息可靠性的重要因素之一.本文针对微博用户权威度的定量计算提出了一种基于多特征融合的微博用户权威度定量评价模型.首先,提出了用户权威度的概念,将其定义为用户影响力和被信服度两部分组成;在暂不考虑用户领域影响因子的情况下,基于新浪微博数据,抽取出微博用户信息传播影响力、用户信息完整度、用户活跃度以及用户平台认证指数4项评价特征,以构建了用户权威度定量计算模型;然后,采用层次分析法对所构建模型的4项评价特征的权值进行确定,并分别给出了4项评价特征的提取算法.同时,在用户关注关系网络的基础上,提出了一种基于用户被关注价值的用户信息传播影响力模型UIRank,并通过实验验证了其比PageRank算法更加有效.实验结果表明,本文提出的微博用户权威度定量计算模型比较合理,为用户权威度的定量评价提供了一种可行的解决方案.     

微博中节点影响力度量与传播路径模式研究

针对微博信息传播特点刻画微博传播网络并定义节点影响力来描述节点重要性,从而分析微博信息传播路径模式。首先采集单条微博的转播/评论数据并进行预处理;然后给出微博传播网络的形式化描述,从局部和全局2方面定义节点的影响力来刻画节点的重要性;比较实验说明新定义的影响力度量方法方法是可行的。同时,结合影响力度量给出了微博网络中信息传播路径的几种典型模式;采用软件NodeXL的可视化结果说明给出的信息传播路径模式具有一定的典型性。     

融合兴趣和行为的用户转发行为预测

微博转发是微博网络中信息得以传播的基础,对用户影响力评估以及网络营销等具有重要意义。现有的方法在考虑影响用户转发行为的因素时,大多只考虑微博以及用户属性等特征,没有考虑用户兴趣和用户历史行为规律等个性化特征,本文提出了基于LDA主题模型的用户兴趣与微博相似度计算方法,将计算结果作为用户兴趣特征,还提出了基于用户转发率、与上游用户交互频率的用户历史行为特征,最后融合用户兴趣特征、用户历史行为特征、上游用户特征、微博特征,建立基于几种常见分类模型的预测方法,在真实数据集上的实验结果表明,该方法能够有效提升预测准确性,取得较好的预测效果。     

基于社会特征的能量感知的容迟网组播协议

由于容迟网DTN(Delay-Tolerant Network)节点间连接的间歇性,节点只能依据机会性相遇转发数据.为此,提出基于社会特征的能量感知的容迟网络的组播SCEAM(Social Characteristics Energy-Aware based Multicast)协议.将社会网络思想引入DTN的路由协议,进而选择合适的转发节点传输数据,这充分利用了节点的长期和较稳定的社会特征知识进行决策转发数据.SCEAM协议就利用节点最重要的社会特征——中心度,并考虑节点能量两项信息选择转发节点.仿真数据表明,提出的SCEAM协议在满足数据传输率的要求下,能够支持更多的组播业务,与SDM协议相比,组播业务提高了近27％.     

数字图书馆公用网络信息传输通道恶意节点检测方法

以确保数字图书馆用户信息的安全性为目的,研究了数字图书馆公用网络信息传输通道恶意节点检测方法。通过拓扑结构分析网络场景,以有效发送率、转发率、入度与传输时延均值描述节点特征属性,再根据节点特征属性构建恶意节点攻击模型。根据恶意节点攻击特征全方位检测网络节点的运行状态并构建观测序列,然后训练隐半马尔科夫模型,通过确定观测序列对于隐半马尔科夫模型的熵值判断节点是否为恶意节点。实验结果表明：该方法能够有效描述实验对象内的恶意节点攻击行为,并准确检测恶意节点。     

基于邻居度信息的节点传播能力度量算法

复杂网络中的节点传播能力度量具有十分重要的意义,有助于抑制谣言扩散、疾病传播等。研究者们普遍用度量节点传播能力,然而度指标忽略了邻居节点的重要程度。文中考虑邻居节点度信息,提出了一种新的度量节点传播能力方法。该方法通过计算邻居节点度的α次方的和来度量节点的传播能力。通过α调整邻居节点对目标节点的重要程度,α越大,度大的邻居节点对目标节点的贡献越大。实验结果表明,在最优值α情况下,文中提出的算法相对于度和K-核分解方法能更加准确地度量节点的传播能力。文中提出的度量方法只考虑邻居节点度信息,因此非常适合于大规模网络的节点传播能力度量。     

基于关系的微博重要度算法研究

近年来微博已经发展为一个影响力巨大的社交网络平台。针对微博的复杂网络特性,提出了对微博用户重要度的算法,从海量微博信息中智能提取重要内容。算法考虑到社交网络的节点间影响以及用户行为的传递性,同时为了提高对海量节点的处理能力,进行了有效的子网分划。通过实验,证明算法能有效分析网络中节点贡献内容的重要度,有助于提高社交网络中舆情监控、分析、管理等工作的效率和准确性。     

基于能量优化的微博用户转发行为预测

微博用户转发行为预测是微博社交网络消息扩散模型构建的基础,在舆情监控、市场营销与政治选举等领域有着广泛的应用.为了提高用户转发行为预测的精度,本文在MRF（Markov Random Field）能量优化框架下综合分析了用户属性与微博内容特征、用户转发行为约束、群体转发先验等因素对用户转发行为的影响,并在逻辑回归模型的基础上构造了相应的能量函数对用户转发行为进行了全局性的预测.实验结果表明,微博用户转发行为不仅取决于用户属性、微博内容等特征,而且也受到用户转发行为约束、群体转发先验等因素不同程度的影响.相对于传统算法,本文算法可以更准确地对用户转发行为进行建模,因而可获得更好的预测结果.     

论微博舆论的消极影响及其治理

2013年4月20日8时02分,四川省雅安市芦山县发生7.0级地震,地震后不到一分钟,就有微博传出地震灾区的声音;其后,播报灾情、微博寻人、转发求助、公益捐款、呼吁提醒等信息在微博里迅速形成强大的舆论场. 1微博舆论的个性特征 如今,微博已经明显超越了网络论坛,成为公众发表意见的主要传播媒介和第二大网络舆情之源.微博舆论是微博用户构成的公众在微博平台上对当前热点事件的议论,它是社会舆论的一种存在形态,具有舆论的基本特征,又呈现出个性特点: 1.1微博舆情传播主体层次多、数量大.微博突破了传统人际传播的模式,是网络舆论传播的升级.微博对事件引起社会各个阶层的关注、对促进事件的解决发挥着不容忽视的重要的作用.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks