网络舆情预警机制的系统动力学仿真

利用层次分析法和系统动力学建模,考虑网络舆情传播各个环节,建立了网络舆情预警机制的系统动力学模型,将网络舆情预警机制定量研究与定性研究相结合,从政府和网络媒体两个方面分析了模型。结果表明,运用系统动力学研究网络舆情提高了舆情预警的准确性;通过提高政府公信力和加强舆情预防,可以缩短舆情运行周期;加强网络监管,从源头提高预警,减弱其对社会的危害性。     

国内网络舆情研究综述

自互联网进入中国后,国内关于网络传播的研究一直没有中断过,但对网络舆情的研究尚处起步阶段。作为一个新兴的研究领域,网络舆情研究在理论与实践的紧密结合中不断拓展和创新。为更好地了解国内网络舆情的研究现状,本文根据对＂中国期刊网＂的检索结果,选取了其中一些有代表性的文献从网络舆情的概念、形成与传播、收集与研判、监控与引导以及网络舆情危机的预警等方面进行综述。     

高校救园网络舆情分析与研判机制研究

本文分别从高校网络舆情的内涵、特点及研究现状等方面对高校校园网络舆情做了详细深入地分析，并针对高校网络舆情研究存在的问题提出了建立网络舆情分析与研判机制的建设性意见。     

RESTful Web服务和知识库协同驱动的突发事件网络舆情实时追踪

突发事件网络舆情可在第一时间反应突发事件的演变过程可为应急管理及时提供事态进展。通过分析目前突发事件网络舆情常见信息来源的种类和结构,研究了不同舆情源之间的异构性,并探讨了使用舆情源专用API和网络爬虫采集网络舆情的方法。在此基础上,协同RESTful Web服务和知识库,构建了突发事件网络舆情实时追踪平台,并针对其舆情库的构建和访问、舆情数据的实时采集以及舆情识别3个关键问题进行了研究,最终实现从互联网中自动识别并实时追踪突发事件的目标。     

基于信息生态学的高校网络舆情研究

基于生态信息学的视角,对高校网络舆情进行了生态要素分解,并对系统特征进行分析,总结高校网络舆情的诱因是由大学生主体和高校主体两方面共同影响。同时,从循环传播机制、组织平衡机制、净化优化机制、协同联动机制等4个方面对高校网络舆情生态系统的运行机制进行了剖析。最后,提出了高校网络舆情管理的优化策略,包括重视网络舆情信息资源监控、提高网络舆情主体素质、健全网络信息法制体系、加强信息技术平台建设等。     

我国突发事件网络舆情研究进展

风险社会与互联网时代叠加，致使由各类突发事件引发的网络舆情也日趋增多.为充分了解我国网络舆情研究进展，有效应对网络舆情引发的不利影响，选取CNKI数据库中突发事件网络舆情相关文献，运用CiteSpace文献分析软件对该领域文献进行主题聚类、时空分布等可视化分析.现阶段我国学界关于突发事件网络舆情的研究热点主要集中在舆情演化传播、监测预警和引导治理三大方面.在对其相关文献成果进行梳理与总结的基础上，得出已有研究需要改善的地方：突发事件网络舆情演化传播定量研究较少，突发事件网络舆情风险动态实时监测、防范控制领域研究较少，尚未构建基于现实情景的网络舆情治理体系等.提出应加强在突发事件网络舆情研究范式转变、网络舆情风险动态监测、跨学科研究视角下的舆情引导治理等方面的研究.     

基于系统动力学的政府网络舆情回应研究

研究对政府网络舆情影响因素进行分析,构建政府网络舆情回应的系统动力学模型,并进行仿真分析。结果表明,政府加强信息公开程度,加快响应速度,提高新闻发言人权威可以有效地增强政府对网络舆情的回应,相应地使网络舆情热度减小。最后根据分析结果提出政府进行网络舆情回应的建议。     

地方政府应对网络舆情监控的初探研究

互联网信息瞬间万变,网络舆情包罗万象,如何正确应对网络舆情,提高地方政府社会管理水平,不断增强政府公信力,成为摆在各地方政府面前的重大课题。本文从国内外网络舆情的现状特点,对地方政府应对网络舆情监控的进行了一些初浅的探讨分析,来有效提升地方政府处理网络舆情的能力。     

基于BBS的网络舆情演变和分析技术研究

在分析网络舆情基本内涵的基础上,采用生命周期方法探索了网络舆情的演变机制,并对网络舆情发展过程中所表现出的特征和规律进行了归纳和总结.在此基础上,以BBS为标的对网络舆情的分析技术进行了探究,建立了以BBS为基础的网络舆情技术分析模型,通过BBS舆情热点事件实验,验证了网络舆情的演变机制,揭示了网络舆情的内在衍生规律.     

网络舆情热点挖掘算法研究与实现

随着网络信息交互及传播的迅速与便捷,有效地对不断涌现的海量互联网信息进行采集并发现网络热点舆情具有十分重要的意义.研究网络舆情的表示及特征,提出采用网络化方法思想,结合Hits算法和PageRank算法进行舆情热点挖掘,并在此基础上设计了网络舆情热点挖掘系统.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.