网络教育服务中的客户细分策略分析     

文碧桂  赵蔚 《中国教育技术装备》2010,(12):12-14

随着终身学习理念的深入人心,网络教育服务市场前景会更加广阔,同时竞争也在加剧。对客户进行细分,提供有针对性的营销策略、服务模式将有助于提高网络教育服务机构市场竞争力。从客户终身价值、学习者媒介偏好、利益细分等角度分析网络教育服务中的客户细分策略。  相似文献   

谢无量《中国大文学史》得失论     

王友胜 《湖南第一师范学报》2010,10(1):91-93

谢无量的《中国大文学史》是一部得失兼具的早期文学史论著。该书内容丰富、分期合理、材料翔实,充分体现了文学史编写内容由宽而泛向纯而专过渡的积极意义;但也明显存在着结构有失均衡,资料引证过繁,未能谨守“纯文学观”而出现的偏颇。  相似文献   

SVM for density estimation and application to medical image segmentation     

Zhang Z  Zhang S  Zhang CX  Chen YZ 《Journal of Zhejiang University. Science. B》2006,7(5):365-372

A method of medical image segmentation based on support vector machine （SVM） for density estimation is presented. We used this estimator to construct a prior model of the image intensity and curvature profile of the structure from training images. When segmenting a novel image similar to the training images, the technique of narrow level set method is used. The higher dimensional surface evolution metric is defined by the prior model instead of by energy minimization function. This method offers several advantages. First, SVM for density estimation is consistent and its solution is sparse. Second, compared to the traditional level set methods, this method incorporates shape information on the object to be segmented into the segmentation process. Segmentation results are demonstrated on synthetic images, MR images and ultrasonic images.  相似文献   

Collection-based compound noun segmentation for Korean information retrieval     

In-Su Kang  Seung-Hoon Na  Jong-Hyeok Lee 《Information Retrieval》2006,9(5):613-631

Compound noun segmentation is a key first step in language processing for Korean. Thus far, most approaches require some form of human supervision, such as pre-existing dictionaries, segmented compound nouns, or heuristic rules. As a result, they suffer from the unknown word problem, which can be overcome by unsupervised approaches. However, previous unsupervised methods normally do not consider all possible segmentation candidates, and/or rely on character-based segmentation clues such as bi-grams or all-length n-grams. So, they are prone to falling into a local solution. To overcome the problem, this paper proposes an unsupervised segmentation algorithm that searches the most likely segmentation result from all possible segmentation candidates using a word-based segmentation context. As word-based segmentation clues, a dictionary is automatically generated from a corpus. Experiments using three test collections show that our segmentation algorithm is successfully applied to Korean information retrieval, improving a dictionary-based longest-matching algorithm.

Jong-Hyeok LeeEmail:

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基于模糊C-均值聚类图像分割技术研究     

任燕 《科技通报》2012,28(4):206-208

主要研究了均值聚类图像分割问题。针对传统的聚类图像分割算法对图像地分割精度较低等问题,提出一种基于模糊控制的C-均值聚类快速图像分割新方法。本文采用快速模糊C-均值聚类算法对图像分割。实验结果表明,图像分割边缘清晰,分割效果明显优于传统的聚类图像分割算法。  相似文献   

高分辨率捺印掌纹的自动分割     

周雨阳  阿勇  吴敏  文成明 《中国科学院研究生院学报》2012,29(3):392-398

设计了2种全新的自动掌纹分割算法.第1种利用一致局部二进制模式的频数统计逐块检测背景区域;第2种根据相邻区域(块)之间的纹理差异容忍度,将相似的区域合二为一,差异较大的标记为两类区域.然后通过区域生长分别得到掌纹前景和背景.2种算法在标准掌纹档案库中都得到了成功应用.  相似文献   

汉语自动分词与内容分析法研究   总被引：9，自引：0，他引：9  

邱均平  文庭孝  周黎明 《情报学报》2005,24(3):309-317

汉语自动分词是计算机中文信息处理中的难题,也是文献内容分析中必须解决的关键问题之一。本文通过对已有自动分词方法及其应用研究的分析,指出了今后汉语自动分词研究的三个发展方向:克服汉语文本切分中的困难,继续研究传统文本切分的有效方法;将人工智能技术与汉语自动分词技术有机结合起来;改造汉语文本书写规则使之利于计算机切分。并分析了汉语自动分词和内容分析法之间的密切关系,以及汉语自动分词对内容分析法的影响  相似文献   

基于反序词典的中文逆向最大匹配分词系统设计*   总被引：6，自引：0，他引：6  

张李义  李亚子 《现代图书情报技术》2006,1(8):42-45

介绍几种常见的分词算法，在改进传统的反序词典、优化逆向最大匹配算法的基础上，设计并实现基于逆向最大匹配的中文分词系统，试验证明速度和精度都有显著提高。  相似文献   

Assessing cultural values: developing an attitudinal scale   总被引：1，自引：0，他引：1  

Andy S. Choi  Franco Papandrea  Jeff Bennett 《Journal of Cultural Economics》2007,31(4):311-335

Effective measurement of cultural value is often elusive because of its multidimensional nature. It is also influenced by sociodemographic characteristics (manifest variables) and attitudinal characteristics (latent variables) of populations. While the former is easily available to researchers, the latter has not been fully studied. This paper suggests the use of a cultural worldview scale that was developed to measure cultural attitudes of people, using factor and cluster analysis. Four factors comprise the scale: cultural linkages, recognition of cultural values, cultural loss and preservation of traditions and customs. Some advantages of using this scale are demonstrated, and relationships with sociodemographic variables are investigated. Managerial and policy implications are discussed.

Jeff BennettEmail:

  相似文献   

基于国产GF-1遥感影像的山区细小水体提取方法研究   总被引：5，自引：0，他引：5  

李艳华  丁建丽  闫人华 《资源科学》2015,37(2):408-416

以国产"高分一号"16m遥感图像为数据源,在特克斯县选取两个研究区域,针对山区细小线状河流提取难度较大的问题,使用基于规则的面向对象的方法实现了对山区细小水体的精确化提取。首先,在总结前人选择最优分割尺度的基础上,考虑了各层权重信息,针对某一特定地物,提出了指示最优分割尺度的指标——改进的与邻域绝对均值差分方差比(MRMAS),并由此获取了影像上细小水体的最优分割尺度。其次,为区分水体和山体阴影,构建阴影水体指数SWI=B1+B2-B4,成功剔除了绝大部分阴影信息。最后,利用形态学膨胀滤波及Pavlidis异步细化算法对提取的细小水体进行后处理,最终得到细小河流的矢量化水系图。实验结果表明,该方法可以完整、快速地提取出山区细小线状河流信息,总体精度在90%以上,Kappa系数在85%以上,有效排除阴影等暗色地物的干扰,基本消除椒盐噪声。该研究成果或对国产高分影像处理系统的研发与应用提供一定的科学参考。  相似文献