Local word vectors guiding keyphrase extraction     

Eirini Papagiannopoulou  Grigorios Tsoumakas 《Information processing & management》2018,54(6):888-902

Automated keyphrase extraction is a fundamental textual information processing task concerned with the selection of representative phrases from a document that summarize its content. This work presents a novel unsupervised method for keyphrase extraction, whose main innovation is the use of local word embeddings (in particular GloVe vectors), i.e., embeddings trained from the single document under consideration. We argue that such local representation of words and keyphrases are able to accurately capture their semantics in the context of the document they are part of, and therefore can help in improving keyphrase extraction quality. Empirical results offer evidence that indeed local representations lead to better keyphrase extraction results compared to both embeddings trained on very large third corpora or larger corpora consisting of several documents of the same scientific field and to other state-of-the-art unsupervised keyphrase extraction methods.  相似文献   

PCSI:一种单篇论文被引频次标准化方法     

伍军红  肖宏  任美亚  冯士雍  丁哲 《图书情报工作》2020,64(23):22-30

[目的/意义] 文章的被引频次一直是量化评价一篇论文学术影响力的重要指标。但在不同学科不同年份发表的论文会因该领域研究论文数、引用滞后等因素呈现较大的差异。因此在对比两篇论文时，难以简单依据被引频次的绝对值来评判论文影响力大小。为此，本文设计了一个新的可计算数学模型，使得每篇论文可以有一个标准化的指标，以便对不同学科不同年份发表的论文的学术影响力进行直接比较。[方法/过程] 通过分析2006、2017两年中国科技类学术期刊各学科论文的被引频次分布规律，采用同学科论文被引频次的分布形态最接近对数正态分布的先设条件，提出一种被引频次标准化指数——Paper Citation Standardized Index （简称PCSI，中文"论文引证标准化指数"）。最后以中国科协优秀科技期刊论文评选结果为例，将它们与论文所属学科全部论文进行实证对比研究。[结果/结论] 结果证明，PCSI对不同年份、不同学科论文的被引频次进行了标准化，反映了被引频次的线性差距，是一种较为理想的单篇论文学术影响力比较评价工具。  相似文献   

Relational maintenance and caregiving in the grandparent-grandchild relationship     

Daniel H. Mansson 《Communication Research Reports》2020,37(1-2):1-10

ABSTRACT

The purpose of this study was to examine the relationships between grandparents’ use of relational maintenance behaviors (RMB) and their young adult grandchildren’s willingness to serve as future caregivers for their grandparents. Undergraduate students (N = 209) completed a questionnaire in which they reported on a specific grandparent’s use of RMB and how willing they were to serve as future caregivers for that specific grandparent. Results of a multiple regression analysis provided partial support for the hypothesized positive relationships between grandparents’ use of RMB and grandchildren’s willingness to serve as future caregivers for their grandparents.  相似文献   

A longitudinal investigation of protective factors for bereaved maltreated youth     

《Child abuse & neglect》2019

BackgroundMaltreated youth are at an elevated risk for the development of problem behaviors. Coping with the death of a family member or close friend during adolescence, referred to as bereavement, is a stressful event that could potentiate risk linked to maltreatment. However, developmental research suggests that youth adjustment is a product of multiple risk and protective factors. Although maltreated youth who experience loss may be particularly vulnerable to behavior problems, personal and contextual factors may attenuate or exacerbate youths’ risk for internalizing and externalizing psychopathology.ObjectiveThe overarching goal of this study is to examine individual, family, and community-level protective factors for maltreated youth who experience bereavement. Specifically, we aim to examine the effect of age 12 bereavement on age 16 internalizing and externalizing psychopathology, and to investigate the moderating role of multi-level protective factors at ages 14 and 16.MethodsThe study consisted of a sample of 800 youth (52.4% female, 45.1% African-American) drawn from the Longitudinal Studies of Child Abuse and Neglect (LONGSCAN), collected from 1998 to 2011.ResultsMaltreated youth who experienced significant loss were at increased risk for externalizing symptoms, compared to non-bereaved maltreated youth (β = 0.085, p < .05). Individual future orientation (β = 0.103, p < .05) family future orientation (β = −0.120, p < .05), parental monitoring (β = −0.123, p< .01), and neighborhood collective efficacy (β = −0.126, p < .01) each significantly moderated the association between bereavement and externalizing symptoms.ConclusionsThese results have implications for future interventions aimed towards reducing problem behaviors in adolescents with a history of child maltreatment and who experience bereavement.  相似文献   

Associations between individual and collective efficacy beliefs and students' bystander behavior     

Björn Sjögren  Robert Thornberg  Linda Wänström  Gianluca Gini 《Psychology in the schools》2020,57(11):1710-1723

This study examined whether defending and passive bystanding during peer victimization episodes were associated with individual- and classroom-level efficacy to stop peer victimization. Self-report survey data were analyzed from 1,467 Swedish fourth-grade students (mean age = 10.55) from 100 classrooms in 63 schools. Multilevel analyses revealed that, when witnessing peer victimization, students more often defended victims if they were high in defender self-efficacy and if they belonged to classrooms high in collective efficacy. In contrast, students were more likely to remain passive if they were low in defender self-efficacy and if they belonged to classrooms low in collective efficacy. Taken together, our findings suggest that efficacy beliefs both at the individual and at the classroom level contribute to explaining variability in students' bystander behaviors, which has potential implications for prevention and intervention work.  相似文献   

德国“双元制”模式对我国职业教育改革的借鉴   总被引：1，自引：0，他引：1  

龚利群  黄日强 《三门峡职业技术学院学报》2010,9(2):12-14

"双元制"职业教育模式是德国采取的一种较成功的办学模式,该教育模式"重实践过程、重方法训练、重能力培养",其成功经验被许多国家借鉴、采用和推广。科学借鉴德国"双元制"职业教育模式,发展我国职业教育事业,应从职业教育立法、能力培养、师资队伍建设和开展校企合作等多方面深化职业教育教学改革。  相似文献   

网络环境下有效学习行为特征及影响因素研究     

黄家荣  曹榴 《教育与教学研究》2021,(4):41-52

在网络环境下,学习者由于高度自由同时又缺乏有效的监管,学习很容易受到外界事件的干扰,并不能完全保证学习者的学习行为是有效的。为保证网络环境下学习的质量与绩效,有必要对网络环境下的有效学习行为进行深入研究。文章在“有效学习”定义基础上,提出网络环境下有效学习行为的概念及其特征,并详细讨论了网络环境下有效学习行为的主要影响因素,最后从中得到提高网络环境下学习行为有效性的启示:在课前,教师要做好学前分析,检查学习者是否已有本次学习必要的基础知识储备,并帮助学习者明确自己的学习目标,给学习者提供必要的学习环境;在课中,教师要注重学习者信息技术应用能力的培养,同时给学习者施加一定的外部动机,并结合具体情况,给予学习者有效的引导;在课后,教师需要及时对这节课进行反思总结。  相似文献   

一种模型参考自适应速度辨识的异步电机直接转矩控制及其计算机仿真     

孙文  殷洪军 《科技广场》2007,(3):31-33

本文从异步电机的数学模型出发,在直接转矩控制的基础上,介绍了一种新型的基于反电动势的模型参考自适应的无速度控制方法,并对该方法进行了仿真验证。实验表明,该方法效果良好。  相似文献   

《情报科学》载文被引分析   总被引：25，自引：5，他引：25  

王惠翔 《情报科学》2002,20(2):148-150

本文以《情报学报》等10种我国图书馆学情报学核心期刊为样本，对《情报科学》载文被10种期刊近三年（1998－2000年）引用情况进行一次调查分析。  相似文献   

论网络环境下图书馆参考咨询工作   总被引：5，自引：0，他引：5  

曲晓杰 《情报科学》2002,20(6):588-589,594

数字图书馆是21世纪全世界图书馆发展趋势已是不争的事实，本文根据数字化图书馆的发展趋势及网上信息源的特点，简述了网络环境下图书馆参考咨询存在的问题以及应采取的措施，同时也简述了网络环境下参考咨询员应具备的素质。  相似文献