基于社会媒体的股票行为预测

通过社会媒体信息预测股票行为已经成为近年来金融和知识管理等领域的研究热点。考虑到社会媒体参与人员和讨论话题的多样性,传统的基于整体层面分析社会媒体信息来预测股票行为的方法过于粗糙。本文根据社会媒体信息在写作风格和内容特征上的不同,利用文本特征提取技术、主成分分析法、EM聚类技术等分析参与社会媒体的干系人和他们关注的话题。进一步,我们针对每类干系人和话题,从信息活动强度和情感倾向两个方面提取四个社会媒体变量构建股票行为的回归预测模型,用以分析各干系人和话题在社会媒体上的活动状况对公司股票行为的影响。最后,本文以雅虎金融论坛的Bank of America板块为实验平台进行实验研究,验证了所提出方法的有效性和实用性。     

Edge Estimation in the Population of a Binary Tree Using Node-Sampling

Suppose a finite population of several vertices, each connected to single or multiple edges. This constitutes a structure of graphical population of vertices and edges. As a special case, the graphical population like a binary tree having only two child vertices associated to parent vertex is taken into consideration. The entire binary tree is divided into two sub-graphs such as a group of left-nodes and a group of right-nodes. This paper takes into account a mixture of graph structured and population sampling theory together and presents a methodology for mean-edge-length estimation of left sub-graph using right edge sub-graph as an auxiliary source of information. A node-sampling procedure is developed for this purpose and a class of estimators is proposed containing several good estimators. Mathematical conditions for minimum bias and optimum mean squared error of the class are derived and theoretical results are numerically supported with a test of 99% confidence intervals. It is shown that suggested class has a sub-class of optimum estimators, and sample-based estimates are closer to the true value of the population parameter.     

新型的无监督纹理分割方法

提出了一种利用Gabor滤波器组对图像进行纹理特征提取,然后将这些特征向量作为外部刺激输入给PCNN对图像进行分割的新方法。该方法既保持了精确的分割结果,同时又解决了Gabor滤波器运算数据量大处理速度慢的问题。从实验结果可以看出,该方法与传统采用Gabor的纹理分割方法相比速度有很大的提高,而其分割精度与传统分割方法相似。     

针对纸病检测的实时污点提取算法

提出一种高效、实时的专门针对纸病检测的污点提取算法。该算法对CCD相机采集的每一行图像数据进行即时处理,并立即判断该行数据上有几段污点线段,该污点线段是否与上行数据的污块相连通。算法通过逐行扫描的方式,将被检测污块逐段向下推进,直到认为到达污点的最下方边沿。实际应用结果表明,该算法适用于检测任意形状的污块。     

Subject to a new law: historicizing rights and resistance in Maya anti-mining activism

ABSTRACT

Since 2004, the Marlin Mine, located in North-west Guatemala, has produced conflict between Goldcorp, the Guatemalan state and the primarily indigenous Mayan communities affected by the mine. This conflict has generated local anti-mining movements that organized community consultations which, grounded in indigenous rights law and Mayan decision-making practices, allow affected communities to decide whether or not to permit mining in the region. While communities resoundingly rejected open-pit mining, and while this decision received international support, the Marlin Mine continues operations. Drawing on field research and new developments in philosophies of rights, this paper makes two related arguments. First, Mayan anti-mining resistance must be situated within a broader colonial history defined by exploitation and primitive accumulation. Second, Mayan activism challenges current conceptions of the relationship between rights, cultural identity and political agency; most significantly, Mayans do not only claim rights on the basis of identity, they enact and politicize the form in which these rights potentially take place.     

剪纸艺术多媒体交互平台中的图像检索技术研究

利用信息技术手段保护非物质文化遗产资源是目前研究的热点之一,图像检索技术的研究是构建剪纸艺术多媒体交互平台的关键环节。分析了基于文本的图像检索（TBIR）和基于内容的图像检索（CBIR）的思路及算法,并在剪纸艺术多媒体交互平台中进行了实现。深入对比了两者的优缺点,探讨了两种检索方式相结合的可能途径,在此基础上提出利用自动语义标注技术解决图像检索中存在的“语义鸿沟”问题,有利于提高图像检索的效率和准确率。     

正交试验优选马铃薯糖苷生物碱提取工艺

对马铃薯中糖苷生物碱的超声提取工艺进行了研究。以α-茄碱为对照品,通过L9（34）正交试验,优选了工艺参数。结果表明：选用含5%醋酸的乙醇为提取溶剂,各因素的影响依次为：提取次数〉乙醇体积分数〉料液比〉提取时间。最优提取工艺条件是：以60%的乙醇为溶剂,提取时间30 min,料液比1：10,三级提取,粗提物得率薯芽最高为0.016g/g,测得粗提物糖苷生物碱含量230 mg/g;薯芽、薯皮、薯肉中糖苷生物碱含量分别为3.37 mg/g、2.91 mg/g、0.68 mg/g。     

多板纲动物的不同保存方法对基因组DNA提取的影响

为了探讨最佳的适合提取DNA的石鳖样本保方法,以日本花棘石鳖Liolophura japonica、日本宽板石鳖Placiphorella japonica、红条毛肤石鳖Acanthochiton ruhrolineatus、平濑锦石鳖Onithochiton hirasei、网纹鬃毛石鳖Mopalia retifera为实验材料,对其分别以甲醛浸泡、95%乙醇浸泡、-75℃超低温保存的样本进行基因组DNA提取.通过紫外分光光度计、琼脂糖凝胶电泳对DNA产物进行检测.结果表明：新鲜材料和用乙醇保存的样品比用-75℃超低温保存的样品提取出的DNA纯度和浓度都高,用甲醛浸泡的方法保存没有提取出DNA.结果表明,超低温保存适合用于DNA提取.但是由于条件限制,长距离外采集样本时适合于用乙醇保存,并且成本较低.     

落葵果实中总黄酮提取条件的研究

采用超声波提取法,通过正交实验确定从落葵果实中提取总黄酮的最佳工艺条件,并用比色法测定提取物中总黄酮的含量.结果表明,最佳条件是以体积分数为70%的乙醇为提取剂、料液比为1：20、提取时间为35min.在此条件下,落葵果实总黄酮提取量为5.3 mg蛐g.     

乐钧生平和家世考证研究

乐钧是清代乾嘉时期的文学家。学者对乐钧的诗词和文言小说研究的较多,到目前为止,还没有学者对其家世和生平进行专门的研究。文章试着从乐钧生平和家世两方面对其进行考证研究。乐钧,生于乾隆三十一年(1766),卒于嘉庆十九年(1814),享年四十九岁。乐钧出身于贫苦之家,其妻王氏则是当地声望很高、传奇式才子王痴山之女,乐钧和王氏共育有四儿一女。