排序方式： 共有121条查询结果，搜索用时 15 毫秒
81.
多元化战略是企业扩展业务、增强企业竞争力的关键战略之一。然而,在不同的宏观环境下,关于多元化战略与企业绩效之间关系的实证研究往往得到不一致的结果。与以往的研究不同,本文采用固定的研究对象,但在截然不同的经营环境中,观察其多元化战略与企业绩效之间的关系。通过利用韩国30家大型企业集团1997年亚洲金融危机前后14年(1990~1996, 1999~2005)的财务数据,以企业经营管理因素为自变量,企业绩效为因变量,衡量不同多元化程度的企业绩效差异。结果表明:(1)金融危机促进了企业对内部管理因素的重视,并使企业改变对于危机管理的态度;(2)危机之后,企业的经营因素与经营成果之间的正相关关系更加显著;(3)低多元化企业较高多元化企业表现出更好的经营绩效。 相似文献
82.
M.J. Park O.M. Kwon Ju H. Park S.M. Lee E.J. Cha 《Journal of The Franklin Institute》2012,349(5):1699-1720
This paper proposes new delay-dependent synchronization criteria for coupled stochastic neural networks with time-varying delays and leakage delay. By constructing a suitable Lyapunov–Krasovskii's functional and utilizing Finsler's lemma, novel synchronization criteria for the networks are established in terms of linear matrix inequalities (LMIs) which can be easily solved by using the LMI toolbox in MATLAB. Three numerical examples are given to illustrate the effectiveness of the proposed methods. 相似文献
83.
Kyungbin Kwon Suhkyung Shin Thomas A. Brush Krista D. Glazewski Thomas Edelberg Su Jin Park 《Interactive Learning Environments》2018,26(6):839-855
This study examined the types of learning behaviors students demonstrated while performing inquiry tasks. It also explored the relationship between the learning behaviors and students’ domain knowledge. We observed fourteen students in five groups during a ninth-grade biology course. Three types of learning behaviors (inquiry, collaborative, and minimally productive behaviors) were identified and time on each type was measured. The results suggest that students demonstrated different patterns according to the types of learning behaviors. Correlation analysis revealed that learning outcomes had a strong positive correlation with the inquiry behaviors but a strong negative correlation with the minimally productive behaviors. The results suggest that attention should be paid to facilitate the more meaningful inquiry behaviors while reducing minimally productive behaviors. 相似文献
84.
As digital modelling programmes become increasingly prevalent in interior design education, there is concern that graduates are entering the workforce relying too much on strong graphic presentation skills while lacking the basic ability to speak about design. This study explores the gap between practitioners’ perceptions of importance regarding oral presentation competency and students’ perceptions of their oral presentation performances. Additionally, the study explores correlations between in‐class activities and students’ perceptions of their oral presentation competency. Mixed‐methods of investigation include a Delphi study with a panel of interior design practitioners and a survey questionnaire of both practitioners (n = 102) and currently active interior design students (n = 91) in the USA. An Importance‐Performance framework is employed for comparison. Results identify performance criteria for evaluating oral presentation competency and indicate variances between students’ perceptions of their performance and industry perceptions of importance. Furthermore, students’ in‐class activities including studio critiques and written peer assessments show significant correlation with student oral presentation performance indicating activities already frequently incorporated into a design curriculum may have a greater impact on improving performance than specific oral presentation instruction alone. 相似文献
85.
Evaluation of a lower-body compression garment 总被引：1，自引：0，他引：1
Doan BK Kwon YH Newton RU Shim J Popper EM Rogers RA Bolt LR Robertson M Kraemer WJ 《Journal of sports sciences》2003,21(8):601-610
The aims of this study were to determine how custom-fit compression shorts affect athletic performance and to examine the mechanical properties of the shorts. Ten male and 10 female track athletes on a university's nationally competitive track team, specializing in sprint or jump events, participated in the study. Testing utilized the compression shorts with loose-fitting gym shorts as the control garment. Several significant effects were revealed for the custom-fit compressive garment. Although 60 m sprint time was not affected, hip flexion angle was reduced. Skin temperature increased more and at a faster rate during a warm-up protocol. Muscle oscillation was decreased during vertical jump landing. Countermovement vertical jump height increased when the participants were wearing the custom-fit compression garment. In materials testing, the elasticity of the compressive garment provides increased flexion and extension torque at the end range of extension and flexion, respectively, and may assist the hamstrings in controlling the leg at the end of the swing phase in sprinting. The compressive garment significantly reduced impact force by 27% compared with American football pants alone. Through various mechanisms, these findings may translate into an effect on athletic performance and a reduction in injuries. 相似文献
86.
The current study explored the personality dimensions of brands on Social Networking Sites (SNSs) using a South Korean sample. Through a series of exploratory and confirmatory factor analyses, six dimensions (i.e. Openness, Conscientiousness, Agreeableness, Extraversion, Warmth, and Contentiousness) were yielded for brands with SNS presence. The data also produced six dimensions (i.e. Openness, Sincerity, Extraversion, Competence, Agreeableness, and Ruggedness) for brands without SNS presence. The results show that brands with which consumers interact on SNSs have more human-like personalities than brands absent from SNSs, and the personality dimensions affected brand affect and trust to varying degrees. 相似文献
87.
K. Hazel Kwon J. Hunter Priniski Monica Chadha 《Communication methods and measures》2018,12(2-3):216-237
ABSTRACTThis study addresses the issue of sampling biases in social media data-driven communication research. The authors demonstrate how supervised machine learning could reduce Twitter sampling bias induced from “proxy-population mismatch”. Particularly, this study used the Random Forest (RF) classifier to disentangle tweet samples representative of general publics’ activities from non-general—or institutional—activities. By applying RF classifier models to Twitter data sets relevant to four news events and a randomly pooled dataset, the study finds systematic differences between general user samples and institutional user samples in their messaging patterns. This article calls for disentangling Twitter user samples when ordinary user behaviors are the focus of research. It also builds on the development of machine learning modeling in the context of communication research. 相似文献
88.
The current study examined the effects of different types of instructor comments on student engagement in an online discussion. In particular, this study examined three comment types: (1) praise-oriented comments, agreeing with students’ initial messages and recapping their ideas, (2) elaboration-encouraging comments, requesting elaboration on the initial messages, and (3) perspective-widening comments, suggesting different or thought-provoking opinions responding to the initial messages. Seventeen graduate students enrolled in an online course were recruited. A content analysis was employed to evaluate the levels of knowledge construction. Interactivity was measured by the number of posts and idea units. The findings revealed that perspective-widening comments facilitated students’ evaluation on the peer postings and brought up diverse perspectives, contributing to knowledge construction. While elaboration-encouraging comments led to high interactivity among students, praise-oriented comments had no significant effect on the frequency of interactivity. 相似文献
89.
An online discussion facilitates students’ higher order thinking in online classes, especially when adopted with the instructor’s guidance. The current experimental study examined the effects of two different discussion representation tools (social and cognitive diagrams) on students’ discussion behaviors. The social diagram emphasized interactivity of participants by illustrating who posted messages and who replied. The cognitive diagram described how discussion topic evolved by summarizing main topics discussed. Thirteen graduate students enrolled in an online graduate course participated in the study. While analyzing five instructional cases, students were asked to discuss each case in a group that the instructor assigned randomly. For each case, one group was provided with the social diagram whereas the other with the cognitive diagram. Major findings revealed both tools facilitated online discussion activities as the instructor intended: the social diagram turned out to promote socially desirable responses while the cognitive diagram produced more cognitively desirable responses. Further studies on how the two types of discussion diagrams can be integrated in online discussions will be needed. 相似文献
90.
This study investigates networked framing of terrorism news in Twitter by distinguishing three proximity effects (geographic, social, and temporal proximity) on audience and media institutional frames (i.e., episodic/thematic and space frames), based on construal-level theory. An analysis of tweets during the Boston Marathon bombing and the Brussels Airport attack finds that institutional and audience frames show similarity but do not always converge on Twitter. Similarities in the audience and institutional frames are attributed to a universal human tendency for social categorization, inherent in the minds of not only ordinary citizens but also journalists. Proximity effects, however, were more salient on audience frames than on institutional frames. 相似文献