面向对象的天然绿洲与人工绿洲区分——以民勤县湖区绿洲为例

以地处河西走廊东端、石羊河下游的民勤县湖区绿洲为例,以Landsat 8 OLI影像为数据源,从天然绿洲和人工绿洲的基本概念出发,在影像数据预处理、多尺度分割的基础上,综合考虑光谱、纹理、形状、上下文等信息,引入NDVI、最大化差异、紧致度、形状指数和空间邻接关系等多个特征,构建规则集进行天然绿洲和人工绿洲的区分,并将区分结果与基于最大似然法监督分类的绿洲区分结果进行比较分析。结果表明:使用面向对象的影像分析方法区分天然绿洲和人工绿洲的总体精度达到了91.75%,Kappa系数为0.65;较之面向像元的最大似然法监督分类结果,总体精度提高了10.40%,Kappa系数提高了0.13,其中人工绿洲条件Kappa系数提高了0.19,天然绿洲条件Kappa系数提高了0.30。面向对象的影像分析方法能够在一定程度上克服单一光谱特征分类方法的局限性,避免异物同谱和同物异谱现象带来的混淆,提高天然绿洲和人工绿洲区分的精度。     

二进制区分矩阵的简化方法

粗集是一种处理不确定性知识的重要工具,针对粗集理论中的二进制区分矩阵的空间和时间上的不必要开销,基于动态的思想和概率论,提出了一种可降低二进制区分矩阵空间及时间开销的方法。     

二进制区分矩阵的简化方法

粗集是一种处理不确定性知识的重要工具,针对粗集理论中的二进制区分矩阵的空间和时间上的不必要开销,基于动态的思想和概率论,提出了一种可降低二进制区分矩阵空间及时间开销的方法.     

伪造对区分服务的影响

在提供区分服务的定价方法中,Marbach提出的静态定价方法假设各个优先级的价格事先确定,如果ISP诚实,在用户进入市场后,ISP无法影响用户的服务选择来增加效用.如果ISP不诚实,通过伪造用户使用网络,从而影响用户的服务选择,由此增加效用.用户意识到ISP可能伪造,会采取检查网络市场的对策来确保ISP诚实.对于伪造的经济分析以及用博弈论方法进行的分析都表明ISP有可能伪造.毫无疑问,ISP伪造改变了用户和ISP的行为与效用,具体例子也说明了伪造的影响.     

面向对象程序设计区分专业的课程设置研究

针对计算机及相关学科均开设面向对象程序设计课程的现状,依据不同专业的特点和培养目标调整课程设置,以课程名称的选择为切入点,对C++、Java、C#等面向对象程序设计语言以及Visual C++、Dev-C++等集成开发环境进行对比和分析,提出区分专业的课程设置方案。     

粗集中区分矩阵对不一致问题处理的研究

提出了对粗集中区分矩阵对不一致问题处理能力的一种观点,认为粗集中区分矩阵对不一致问题有部分能力,即非完全不能处理不一致问题,也不是完全能处理不一致问题。并给出了证明。     

粗集中区分矩阵对不一致问题处理的研究

提出了对粗集中区分矩阵对不一致问题处理能力的一种观点,认为粗集中区分矩阵对不一致问题有部分能力,即非完全不能处理不一致问题,也不是完全能处理不一致问题.并给出了证明.     

基于软区分矩阵的模糊软集决策方法及其应用

通过在模糊软集中引入水平软集,用软区分矩阵来处理决策问题。首先,利用模糊软集的水平软集,将模糊软集转化为经典软集。其次,在软集中引入软区分矩阵的概念,提出了一种基于软区分矩阵解决模糊软集的新算法来处理决策问题。最后,通过实例说明了该算法的可行性。     

两类高区分能力的Vague集之间的相似度量

提出两类高区能力的Vague集之间的相似度量公式,应用实例表明它们是实用的。     

基于区分矩阵与区分函数的同元转换约简算法

针对较大数据集在区分函数范式转换获得约简解集时的困难性,提出一种基于区分矩阵与区分函数的同元转换约简算法.利用区分矩阵保留数据集的全部分类信息,使用区分函数建立分类信息的数学逻辑范式,从低元的合取范式分步转换为析取范式,根据同元转换算法和高元吸收算法,若能够吸收完全则回退,否则再次调用算法进入转换运算.实例演算结果表明,该算法能缩小一次转换规模,灵活地运用递归算法,使得运算简洁有效.     

Object-oriented Natural and Artificial Oasis Distinguishing in Landsat Imagery: Taking Minqin Oasis as an Example

Taking Minqin Oasis in the downstream area of the Shiyang River Basin which is located in the east of Hexi Corridor as an example, the Landsat 8 OLI image was chosen as the data source. Under the consideration of the basic concept of the artificial oasis and natural oasis in this paper, combining with the information of the spectrum, texture, shape and context basing on the image data preprocessing and multi-scale segmentation, we introduce a series of indexes such as NDVI、maximum difference, compactness, shape index, the space adjacency relation and so on to construct a rule set for distinguish between natural oasis and artificial oasis. The obtained results were further compared with the results based on the maximum likelihood method. As a result, the total accuracy of using the object-oriented image analysis method to distinguishing between natural oasis and artificial oasis is 91.75%, and the Kappa coefficient is 0.65 by using the rule set established in this paper. Compared with the results based on the maximum likelihood method, the overall accuracy is improved by 10.40% and the Kappa coefficient is 0.13. The Kappa coefficient of the artificial oasis is increased by 0.19, and the Kappa coefficient of the natural oasis condition is increased by 0.30. The results showed that the object-oriented image analysis method can overcome the limitations of the classification method that only using spectral feature to a certain extent, avoid the confusion caused by the phenomenon of “same object with different spectrums” and “same spectrum with different objects”, and increase the accuracy of distinguishing between the artificial oasis and natural oasis.     

多光谱数据波段选择方法试验研究——以湖北神农架林区为例

本文以神农架林区植被信息提取为例,从统计特征的角度出发,采用最佳指数因子、联合熵与类间、类内可分性判别准则三种波段选择方法。在对三种波段选择方法计算结果综合分析的基础上,结合试验区地物光谱特征和TM传感器不同波段功能,采用逐步逼近的思路,从候选波段组合中确定了最佳波段组合。试验得出TM传感器453波段组合为神农架林区植被信息提取的最佳波段组合。     

Topic Evolution Analysis in Social Networking Services: Taking Sina Weibo as an Example

Event-related topics in social networking services are always the epitome of heated society issues, therefore determining the significance of analyzing its evolution patterns. In this paper, we present a comprehensive survey on the tweets about "ransomware" in Sina Weibo, a famous social networking service similar to twitter in China. The keyword corresponds to a global ransomware attack in May 2017, on which our example event-related topics are based. We collect text data from sina Weibo and vectorize each tweets, before using a dynamic topic model to discover the event-related topics. The results of the topic model are explainable enough and help us to understand the evolution of those topics more thoroughly.     

Comparison of impervious surface area and normalized difference vegetation index as indicators of surface urban heat island effects in Landsat imagery

This paper compares the normalized difference vegetation index (NDVI) and percent impervious surface as indicators of surface urban heat island effects in Landsat imagery by investigating the relationships between the land surface temperature (LST), percent impervious surface area (%ISA), and the NDVI. Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) data were used to estimate the LST from four different seasons for the Twin Cities, Minnesota, metropolitan area. A map of percent impervious surface with a standard error of 7.95% was generated using a normalized spectral mixture analysis of July 2002 Landsat TM imagery. Our analysis indicates there is a strong linear relationship between LST and percent impervious surface for all seasons, whereas the relationship between LST and NDVI is much less strong and varies by season. This result suggests percent impervious surface provides a complementary metric to the traditionally applied NDVI for analyzing LST quantitatively over the seasons for surface urban heat island studies using thermal infrared remote sensing in an urbanized environment.     

我国南方水资源问题与对策-以浙江省为例

以浙江省为例,分析了我国南方存在的水资源问题及其形成的原因,并从水制度和管理、水质污染的控制和治理以及水利工程技术改进三方面,提出了解决我国南方水资源问题的对策。     

信息化技术在高职实训教学中的应用——以“双绞线及其制作”为例

以“双绞线及其制作”教学单元为例，介绍了以传统实训教学为基础，依托学院智慧教室教学环境和网络教学平台，设置课前、课中、课后三个环节开展信息化教学的模式。通过增加自主开发仿真游戏软件、微课视频、课中学习过程数据采集、添加课后小组互评等环节，丰富了教学手段，提高了教学效率并取得较好的教学效果。     

城市文脉在城市景观设计中的应用研究——以历史文化名城丹东为例

文章主要针对丹东现有城市景观设计中对城市文脉应用存在的问题和现象进行了剖析和研究,探讨如何将丹东的城市文脉与城市景观设计更好地融合贯通,形成一种具有传承城市文化、弘扬城市历史、体现城市风貌的全新城市景观设计理念。