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The importance of a scientific journal is usually established by considering the number of citations received by the papers that the journal publishes. In this way, the number of citations received by a scientific journal can be considered as a measure of the total production of the journal. In this paper, in order to obtain measures of the efficiency in the production process, the approach provided by stochastic frontier analysis (SFA) is considered, and econometric models are proposed. These models estimate a frontier production, which is the maximum achievable number of citations to the journal based on its resources. The efficiency can then be measured by considering the difference between the actual production and the estimated frontier. This approach is applied to the measurement of the productive efficiency of the journals of the JCR social sciences edition database, which belong simultaneously to the areas of “economics” and “social sciences, mathematical methods”. 相似文献
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Imanol Ulacia Arantxa Gorostiaga Nekane Balluerka Jone Aliri 《Infancia y Aprendizaje》2017,40(2):277-301
Personal initiative refers to the behaviours that characterize people as being proactive, persistent and self-starting when tackling obstacles that arise as they try to achieve goals. Given the relevance of personal initiative to the educational field, the main aim of this study was to design, implement and evaluate a programme for developing personal initiative in this field. A further objective was to improve a set of variables closely linked to personal initiative. Participants included 160 students aged between 16 and 30 years and enrolled in six centres offering initial vocational training. Of the total sample, 119 students were assigned to the experimental condition and 41 to the control condition. The study’s design was quasi-experimental with a non-equivalent control group. The results indicated that the programme improved the self-starting component of personal initiative and raised the participants’ academic achievement and entrepreneurial attitude. It also had some effect on self-efficacy and on two dimensions of emotional intelligence, namely clarity and regulation. 相似文献
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Diana Gavilan Maria AvelloAuthor VitaeCarmen AbrilAuthor Vitae 《International Journal of Information Management》2014
The future of communication and advertising is mobile. There is, however, little empirical evidence as to exactly how mobile advertising works. This research examines the role of mental imagery elicited by mobile advertising and its mediating effect on trust in the advertising message (ad trust) and purchase intention. Using a 2 × 2 factorial experimental design, we examined the influence of the type of message – SMS vs. MMS – and type of content – informational vs. transformational – on the three dimensions of mental imagery: vividness, quantity and elaboration. Results show a greater impact of MMS mobile ads and transformational ads on vividness and elaboration, while SMS mobile ads have a greater impact on the quantity dimension. The study also suggests that ad trust can be improved by enhancing the mental imagery elicited by mobile ads. Vivid and elaborate mental imagery mediates the effect of the type of ad on ad trust and exerts a positive influence on purchase intention. These findings have important implications for mobile advertisers since overcoming trust issues remains a major obstacle in the adoption of this medium. In addition, practical aspects of mobile ads’ conception and design are discussed and directions for future research are suggested. 相似文献
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从理论上介绍了鱼类摆尾技术的流体力学研究成果,并在实践中与运动员蝶泳腿技术分析相结合,指出水下蝶泳打腿(UUS,亦称水下波动游泳)的运动学、动力学特征以及在游泳出发、转身和划水过程中的应用. 相似文献
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