Word sense disambiguation based on context selection using knowledge-based word similarity     

Sunjae Kwon  Dongsuk Oh  Youngjoong Ko 《Information processing & management》2021,58(4):102551

In this paper, we introduce a novel knowledge-based word-sense disambiguation (WSD) system. In particular, the main goal of our research is to find an effective way to filter out unnecessary information by using word similarity. For this, we adopt two methods in our WSD system. First, we propose a novel encoding method for word vector representation by considering the graphical semantic relationships from the lexical knowledge bases, and the word vector representation is utilized to determine the word similarity in our WSD system. Second, we present an effective method for extracting the contextual words from a text for analyzing an ambiguous word based on word similarity. The results demonstrate that the suggested methods significantly enhance the baseline WSD performance in all corpora. In particular, the performance on nouns is similar to those of the state-of-the-art knowledge-based WSD models, and the performance on verbs surpasses that of the existing knowledge-based WSD models.  相似文献   

Mini-research Experience in Simple Linear Regression     

Paul Isihara  Elisabeth Congdon  Terry Perciante 《PRIMUS》2018,28(7):699-716

Within the undergraduate mathematics curriculum, the topic of simple least-squares linear regression is often first encountered in multi-variable calculus where the line of best fit is obtained by using partial derivatives to find the slope and y-intercept of the line that minimizes the residual sum of squares. A markedly different approach from linear algebra, which could also be introduced in multi-variable calculus, obtains the regression line by vector projection. The latter viewpoint offers elegant proof of the equation relating the total, explained and unexplained variations. Consideration of data with the same regression line and correlation opens the door for a “mini-research experience” (MRE). A sequel MRE gives rise to an open Research Experience for Undergraduates topic to analyze reflection sequences and a fundamental connection between complex analysis and regression analysis. A few general guidelines and basic goals for MREs are included for those whose main interest is in undergraduate research.  相似文献   

微信公众号对提升英文科技期刊影响力的影响——以“药学学报”微信公众号为例     

周心玉  郭焕芳  郑爱莲 《中国科技期刊研究》2018,29(11):1171-1176

【目的】 探讨我国英文科技期刊微信公众号运营的思路，以提升我国英文科技期刊影响力。【方法】 采取个案研究法，总结我国英文科技期刊微信公众号的设计策略。【结果】 “药学学报”微信公众号通过宣传推广文章和构建期刊社群，成功地辅助《药学学报(英文版)》全面提升了影响力。【结论】 我国英文科技期刊微信公众号可围绕宣传期刊文章，以及运营由作者、编委、读者构成的期刊社群，以宣传期刊品牌，全面提升期刊影响力。  相似文献   

基于DE-SVM的船舶航迹预测模型     

刘娇  史国友  杨学钱  朱凯歌 《上海海事大学学报》2020,41(1):34-39

为提高船舶航迹预测精度,解决准确建模难度大和神经网络易陷入局部最优的问题,考虑实时获取目标船AIS数据较少的特点,提出一种基于支持向量机(support vector machine,SVM)的航迹预测模型。选择AIS数据中的航速、航向和船舶经纬度作为样本特征变量;采用小波阈值去噪的方法处理训练数据;采用差分进化(differential evolution,DE)算法对模型内部参数寻优以提高模型收敛速度和预测精度。选取天津港实船某段航迹的AIS数据,比较基于DE-SVM与基于BP神经网络的航迹预测模型的仿真结果。结果表明,基于DE-SVM的航迹预测模型具有更高的预测精度,简单、可行、高效,且耗时少。  相似文献   

基于PCA&SVM的多品种小批量产品质量预测方法研究     

张炎亮  秦惜梦  崔庆安 《科技管理研究》2016,(14):234-237

将主成分分析与支持向量机结合应用到多品种小批量产品的质量预测。首先确定多品种小批量产品生产过程中的定量影响因素,并将其作为初始影响因素集;然后利用主成分分析方法降低因素集的维度,同时提取关键主成分;最后将关键主成分作为影响因素集并建立针对于多品种小批量生产的支持向量机质量等级预测模型。算例分析表明,与传统的支持向量机分类模型相比,主成分分析与支持向量机结合的模型预测准确率及稳定性均有显著提高,说明模型具有更好的预测性能。  相似文献   

"云娜"台风暴雨的Q矢量与螺旋度诊断分析   总被引：5，自引：0，他引：5  

朱健  沈晓玲 《科技通报》2007,23(1):22-27

利用非地转ω方程说明了Q矢量散度的物理意义,并通过计算台风“云娜”影响过程中的Q矢量散度和高低空螺旋度,分析了这两个物理量的演变特征及其与台风、台风暴雨的关系,指出低层等压面上Q矢量散度场及相对螺旋度对台风暴雨预报具有较好的参考价值。  相似文献   

基于集值统计的项目评审模型及其应用   总被引：1，自引：0，他引：1  

王福刚  曾兵  杨杰  韩东波  傅琦 《科技与管理》2006,8(3):47-49

项目评审不会提高一个开发项目的成功几率,却可以降低开发者的失败几率,因为它避免了一个很可能会失败的项目被投入开发。采用集值统计的思想对项目评审问题建立了数学模型,充分考虑了评审过程中人的心理因素的影响,根据专家的打分动态确定模型中的权向量,使之更为合理地反映客观情况,并以实例验证该模型操作简单、易于推广。  相似文献   

幽门螺杆菌CagA蛋白与CTB融合基因的克隆及其植物表达载体的构建   总被引：2，自引：0，他引：2  

姜云水  方平楚  付亚萍  朱诚 《科技通报》2004,20(3):189-193

目的　构建能在水稻胚乳中特异表达的幽门螺杆菌细胞毒素相关蛋白(CagA)和霍乱毒素B亚单位(CTB)的植物表达载体.方法　采用高保真PCR技术分别从质粒pGEM CTB和幽门螺杆菌基因组DNA中扩增出CTB和cagA基因,然后用PCR方法直接融合CTB基因和cagA基因.又用PCR法改造了水稻Wx启动子,在其3′端融合加入Ω序列和Kozak序列.通过一系列亚克隆最终将两个融合基因和NOS终止子插入根癌农杆菌双元载体pCAMBI A1300的表达框架内.结果　PCR验证和测序分析证明,CTB和cagA融合基因以正确的方向插入到载体pCAMBI A1300中,并位于水稻Wx启动子后.结论　成功构建CTB和cagA融合基因的植物表达载体,为幽门螺杆菌口服疫苗的研究奠定基础.  相似文献   

关于吸收集     

宣恒农  刘顺保 《湖南师范大学教育科学学报》1996,(2)

本文通过反例指出吸收集的所谓等价定义并不等价  相似文献   

一种有效的基于运动矢量场的压缩域运动对象分割算法   总被引：1，自引：0，他引：1  

刘志  沈礼权  张兆杨 《上海大学学报(英文版)》2008,12(3):221-227

In this paper an efficient compressed domain moving object segmentation algorithm is proposed, in which the motion vector (MV) field parsed from the compressed video is the only cue used for moving object segmentation. First the MV field is temporally and spatially normalized, and then accumulated by an iterative backward projection to enhance salient motions and alleviate noisy MVs. The accumulated MV field is then segmented into motion-homogenous regions using a modified statistical region growing approach. Finally, moving object regions are extracted in turn based on minimization of the joint prediction error using the estimated motion models of two region sets containing the candidate object region and other remaining regions, respectively. Experimental results on several H.264 compressed video sequences demonstrate good segmentation performance.  相似文献