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对体育灰色关联度分析的某些商榷 总被引：2，自引：0，他引：2
本文在分析文献[1]、[2]的基础上发现了构成女子七项全能总成绩的各单项成绩对全能总成绩的灰色关联度与序列始点有关,与序列长度有关,与数据的信息容量及信息的新陈伐谢有关,并非唯一。任意时间区段的关联度并不具备训练决策的参考意义。 相似文献
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在评估技术关联或互补资产对绩效的影响时,多数文献将这两者分离开来进行研究,忽视了互补资产对技术关联与企业绩效间关系的调节作用。采用中国高技术上市公司2004-2010年面板数据,实证分析技术关联与企业绩效的关系以及不同互补资产对两者关系的调节作用。结果表明,技术关联与企业绩效呈倒U形关系;人力互补资产正向调节技术关联和企业绩效间关系;市场互补资产对技术关联和企业绩效间关系调节作用不显著。在实施技术创新战略时加强技术间关联和专业化互补资产可使企业获取竞争优势。 相似文献
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Jamal Abdul Nasir Iraklis Varlamis Samreen Ishfaq 《Information processing & management》2019,56(5):1605-1617
Searching for relevant material that satisfies the information need of a user, within a large document collection is a critical activity for web search engines. Query Expansion techniques are widely used by search engines for the disambiguation of user’s information need and for improving the information retrieval (IR) performance. Knowledge-based, corpus-based and relevance feedback, are the main QE techniques, that employ different approaches for expanding the user query with synonyms of the search terms (word synonymy) in order to bring more relevant documents and for filtering documents that contain search terms but with a different meaning (also known as word polysemy problem) than the user intended. This work, surveys existing query expansion techniques, highlights their strengths and limitations and introduces a new method that combines the power of knowledge-based or corpus-based techniques with that of relevance feedback. Experimental evaluation on three information retrieval benchmark datasets shows that the application of knowledge or corpus-based query expansion techniques on the results of the relevance feedback step improves the information retrieval performance, with knowledge-based techniques providing significantly better results than their simple relevance feedback alternatives in all sets. 相似文献
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Kai Hu Qing Luo Kunlun Qi Siluo Yang Jin Mao Xiaokang Fu Jie Zheng Huayi Wu Ya Guo Qibing Zhu 《Information processing & management》2019,56(4):1185-1203
Topic evolution has been described by many approaches from a macro level to a detail level, by extracting topic dynamics from text in literature and other media types. However, why the evolution happens is less studied. In this paper, we focus on whether and how the keyword semantics can invoke or affect the topic evolution. We assume that the semantic relatedness among the keywords can affect topic popularity during literature surveying and citing process, thus invoking evolution. However, the assumption is needed to be confirmed in an approach that fully considers the semantic interactions among topics. Traditional topic evolution analyses in scientometric domains cannot provide such support because of using limited semantic meanings. To address this problem, we apply the Google Word2Vec, a deep learning language model, to enhance the keywords with more complete semantic information. We further develop the semantic space as an urban geographic space. We analyze the topic evolution geographically using the measures of spatial autocorrelation, as if keywords are the changing lands in an evolving city. The keyword citations (keyword citation counts one when the paper containing this keyword obtains a citation) are used as an indicator of keyword popularity. Using the bibliographical datasets of the geographical natural hazard field, experimental results demonstrate that in some local areas, the popularity of keywords is affecting that of the surrounding keywords. However, there are no significant impacts on the evolution of all keywords. The spatial autocorrelation analysis identifies the interaction patterns (including High-High leading, High-Low suppressing) among the keywords in local areas. This approach can be regarded as an analyzing framework borrowed from geospatial modeling. Moreover, the prediction results in local areas are demonstrated to be more accurate if considering the spatial autocorrelations. 相似文献
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Luzelle Naude Lindi Nel Ronel van der Watt Florence Tadi 《Teaching in Higher Education》2016,21(1):37-48
Student life is marked by substantial growth in areas such as self-regulation abilities. In this article, the experiences of first-year Psychology students are explored through the lenses of the self-determination theory. Both content and thematic analyses were done with 79 students’ reflections on the aspects they regarded as facilitating/preventing success in their studies. Responses ranged from complete external control (amotivation and external regulation) to high levels of internal control (integration). While many participants articulated their perceptions of incompetence, other participants took ownership of their behavior and articulated how an interest in and enthusiasm for Psychology as a discipline moved them toward feelings of competence, autonomy, and relatedness. High value was placed on a well-structured but warm and responsive educational context. 相似文献
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从自我决定理论(DECI&RYAN,1985)角度解释运动员心理疲劳得到了越来越多的关注,基本心理需要理论是自我决定理论的基础。以基本心理需要与运动员心理疲劳的关系为主线,论述自我决定理论对运动员心理疲劳的解释,发现基本心理需要与心理疲劳呈负相关关系。动机是自我决定理论中不可忽略的因素,有研究指出,自我决定动机中介基本心理需要对心理疲劳的影响(LONSDALE,HODGE&ROSE,2009)。因此,阐述了以基本心理需要为基础的自我决定动机与运动员心理疲劳的关系,横向来看,高自我决定程度的动机与心理疲劳呈负相关,低自我决定程度的动机与心理疲劳呈正相关;纵向研究结果发现,动机的自我决定程度可预测心理疲劳。同时认为,从自我决定理论角度出发可以为运动员心理疲劳领域干预性研究提供思路。 相似文献
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Catherine Malboeuf-Hurtubise Mireille Joussemet Geneviève Taylor Eric Lacourse 《International Journal of Disability, Development & Education》2018,65(1):33-44
Mindfulness-Based Interventions (MBIs) have been increasingly implemented in schools to foster better emotional regulation skills for students with special education needs such as learning disabilities (LDs). This pilot study aimed to evaluate the impact of a MBI on the need satisfaction of elementary students with severe LDs. A prospective quasi-experimental design involving one group and two time points was employed. A sample of 14 elementary school students from a severe LDs special education class participated in this project. Repeated-measures ANOVAs were conducted and revealed a significant reduction in need satisfaction, with a large effect size (η2 = .35). Contrary to our hypothesis, the MBI appeared to be negatively related to need satisfaction among participants. These results indicate that MBIs could be linked with better self-evaluation skills in students with severe LDs, which, in turn, may change (or increase the accuracy of) the perception that children have of their own need satisfaction. 相似文献
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In the context of encouraging the use of natural settings for educational experiences with young children, an exploratory study using survey research and photographs of outdoor settings was conducted to understand how preservice early childhood educators perceive these settings and what educational opportunities, motivations, and barriers they associate with them. Based on the results of 110 participants, this study suggests preservice early childhood educators perceive parks as the most conducive outdoor setting for achieving educational outcomes, specifically structured learning about nature, and that they are more inclined to use maintained outdoor settings than natural outdoor settings. The strongest predictors of intention to use natural outdoor settings were perceived difficulty in using natural settings, participants’ level of nature relatedness, and the degree to which they agreed that experiences in nature were important for young children’s health and wellness. Barriers to address include perceived lack of access to natural settings and safety concerns. 相似文献
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The link between social capital (SC) and Facebook has been widely studied in the U.S., and less is known about how students from different cultures use the site to garner SC. We measured network composition, communication on Facebook, and SC via questionnaires in France and the U.S. We found that American students have a greater proportion of distant to close ties in their networks and higher levels of bridging SC than French, the latter preferring bonding SC. A stronger relationship between SC and communication via Facebook was observed in the U.S. These findings are explained by cultural differences in relatedness. 相似文献