地理信息关联规则挖掘算法的设计与应用

本文着重就地理信息数据挖掘中的两种模式：关联规则和序列模式的概念和作用进行了探讨，阐述了在关联规则中寻找大项集算法的实现，以及在数据挖掘的序列模式基础上对寻找大项集算法的结果进行了改进和优化，使数据的关联规则与时间和序列之间建立了密切的联系，从而更好的实现了对于大规模地理信息数据库中数据的挖掘和利用。     

基于概念分析的空间数据挖掘研究进展

空间数据挖掘的过程与空间概念形成和分析的过程密切相关.本文以空间数据中抽取出各层次、各粒度的概念为主线,以概念形成和分析的形式化理论--概念格和云模型为理论基础,总结了基于概念分析的空间数据挖掘方法及应用,包括概念格的空间关联规则挖掘方法及应用、概念格的概念聚类挖掘方法及应用、云模型的空间关联规则挖掘方法及应用、云模型的空间聚类/分类挖掘方法及应用等.概念格提供了一种形式化的概念描述和概念结构分析的理论和方法,云模型提供了一种综合处理模糊性、随机性以及二者之间关联性的不确定性理论和方法,利用概念格、云模型等形式化的理论和方法分析和描述空间数据挖掘过程中空间概念的形成、空间概念的结构关系、空间概念之间以及空间概念层次之间的不确定性是概念分析的空间数据挖掘研究的进一步的研究方向.     

数据空间自相关性对关联规则的挖掘与实验分析

传统的空间关联规则挖掘,一般足使用属性关联规则的挖掘算法,对空间数据进行泛化处理,不考虑空间数据的空间自相关性,也没有考虑空间自相关与空间关联规则的关系.本文运用改进的Apriori算法对某一数据进行空间关联规则挖掘,并对同一数据进行空间自相关分析,比较两种方法反映的属性的相关性,探讨了数据的空间自相关性对空间关联规则...     

关联规则和序列模式算法在入侵检测系统中的应用

将关联规则算法与序列模式算法应用于入侵检测系统中,介绍了将扩展的关联规则Apriori算法与序列模式GSP算法相结合,挖掘原始审计数据中频繁模式的过程,并实现了这两种算法在入侵检测中的应用.     

数据挖掘中关联规则的探讨

介绍了数据挖掘中关联规则的概念及经典的Apriori算法,以及在Apriori算法基础上的改进算法和数据挖掘的应用领域.     

基于模糊关联规则的NCRE数据分析

在对NCRE数据进行预处理的基础上,通过定义模糊事物数据库,将模糊集与经典关联规则算法结合起来,提出了一种模糊关联规则的数据挖掘算法,将其应用于NCRE数据分析,收到了较好的效果。     

基于模糊关联规则的NCRE数据分析

在对NCRE数据进行预处理的基础上。通过定义模糊事物数据库．将模糊集与经典关联规则算法结合起来，提出了一种模糊关联规则的数据挖掘算法，将其应用于NCRE数据分析，收到了较好的效果。     

关联规则挖掘在卷烟市场研究中的应用

应用基于Apriori算法的关联规则挖掘技术对一次卷烟市场调查得到的数据进行分析，找出其中的关联规则，作为正确决策的基础。     

基于地理国情数据的基础地理信息增量更新方法研究

地理国情普查和监测为基础地理信息的及时更新提供了持续、可靠的参考数据。本文针对地理国情普查监测成果应用和基础地理信息数据更新的实际需求,从数据转换、要素匹配、变化识别和增量更新等方面设计了基于地理国情数据的基础地理信息数据更新技术框架。针对要素相似性匹配和变化识别难题,从距离、面积和形状相似性等方面设计了面向几何要素匹配与变化识别的系列指标、算法和知识规则。研究成果在山东莱芜某地进行了应用。实验结果表明,本文设计的方法对变化要素的识别精度达96.6%,极大地提高了基础地理信息更新的工作效率。研究成果不仅为基础地理信息增量式更新提供了技术支撑,同时也将提高地理国情数据成果的应用价值。     

地学关联规则与时空推理的渔业分析应用

在阐述地学关联规则背景的同时,对地学关联规则作了分类:即空间特征规则、空间区别规则、空间关联规则和时空关联规则。并给出了时空关联规则的数学定义,分析了各指标的意义和对规则提取的影响。进一步对地学关联规则所处理的数据抽象层次、地学数据维数、变量类别和空间配置四方面,进行了剖析和分类。基于规则中数据的抽象层次,将其分为单层关联规则和跨层关联规则;基于规则中涉及到的地学数据维数,将其分为单维关联规则和多维关联规则;基于规则中处理变量的类别,将其分为布尔型和数值型;基于空间配置,将其分为局部关联规则和邻域关联规则。最后,结合海洋渔业的实例,论述了关联规则在时空推理过程中的步骤和方法。     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied     

Advances in Polar Science CONTENTS(Volume 25,2014)

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Guide to Authors： Journal of Mountain Science

<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet.     

Journal of Mountain Science(JMS)

<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by     

Influence of livestock soil eutrophication on floral composition in the Pyrenees mountains

Livestock behaviour in the Pyrenees includes free grazing and a long resting period that provokes the accumulation of dung and urine in some places,so-called camping areas. The aims of this study were （i） to analyze any change in floral composition,and in nutritional and chemical contents of plants in a livestock camping area; and （ii） to relate the floral composition with soil chemical properties. In a linear transect,five sampling zones were established,from the centre of the camping area to the surrounding Nardus stricta-dominant pasture. The above ground plant biomass and the topsoil were sampled in each zone with 6 replicates per zone. Plant species were classified and weighed to calculate above ground biomass,nutritional and chemical contents,and Shannon diversity and evenness indices. Additionally,soils were sampled in two periods,at the beginning and at the end of grazing period. Soil available nutrients （nitrate,ammonium,phosphorus,potassium,calcium and magnesium）,total nitrogen,organic carbon and pH were measured.
Plant chemical contents （protein,lignin and others） were significantly related to the proportions of grasses,legumes and other plants; so,the protein content is positively correlated with legumes plant biomass while lignin content is negatively correlated with grasses. Both plant and soil nutrients increased linearly towards the centre of the camping area. However,the relationship among plant species richness,diversity and evenness relative to its position along the studied transect was bell-shaped. From the outskirts to the centre of the camping area,plants with low nutrient demand were progressively replaced by those with medium and high nutrients demand and by pioneers.
Nardus stricta-dominant pasture has low plant diversity and plant nutrient content as well as a poor soil nutrient availability. The presence of the camping area introduced patches with more soil nutrients and new species in the large spatial scale. However at a small spatial scale,the strong soil nutrien     

General Table of Contents(Vol.11,2014)

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介绍GPS定位中的几个概念

文章概略介绍了利用卫星进行定位的原理 ;由卫星信号传播、信号接收和SA政策等引起的理论误差 ;给出了多种快速、高精度定位的工作模式和观测点选择的原则 ;列出了将WGS - 84坐标转换为我国坐标的公式及解算参数的具体方法 ,供读者在GPS工作中参考。