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Studies of social networks highlight the importance of network structure or structural properties of a given network and its impact on performance outcome. One of the important properties of this network structure is referred to as social capital, which is the network of contacts and the associated values attached to these networks of contacts. This study provides empirical evidence of the influence of social capital and performance within the context of academic collaboration (coauthorship) and suggests that the collaborative process involves social capital embedded within relationships and network structures among direct coauthors. Association between scholars' social capital and their citation-based performance measures is examined. To overcome the limitations of traditional social network metrics for measuring the influence of scholars' social capital within coauthorship networks, the traditional social network metrics is extended by proposing two new measures, of which one is non-weighted (the power–diversity index) and the other (power–tie–diversity index) is weighted by the number of collaboration instances. The Spearman's correlation rank test is used to examine the association between scholars' social capital measures and their citation-based performance. Results suggest that research performance of authors is positively correlated with their social capital measures. The power–diversity index and power–tie–diversity index serve as indicators of power and influence of an individual's ability to control communication and information. 相似文献
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This article adds to the existing literature on nonformal learning in education in general and the role played by written feedback in providing the space for such learning in particular. The study was conducted in an English as a Foreign Language context in which the participating students received written feedback on their English writings. Employing qualitative interviews and stimulated recall methodology, we explored interstudent interactions, cross-cultural understanding, and initiation into communities of practice, and categorized these as reactive and deliberative types of nonformal learning. Drawing upon Eraut's typology of nonformal learning, we would argue that formative written feedback provided on students' writings could lead to nonformal learning because it encourages them to act upon it. 相似文献
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In order to acquire the numerous advantages of electronic commerce, issue of evaluating electronic commerce adoption has its own importance. For this purpose, based on the scientific research and literature reviews, technical, organizational and inter-organizational are identified as the three dimensions for evaluating electronic commerce adoption of the companies. Thereafter, expert viewpoints were put forward about criteria and indicators in each of the above-mentioned dimensions. On the basis of identified indicators and criteria, a framework was developed for evaluating the electronic commerce adoption in Iranian companies. Furthermore in this research, the framework is tested in 27 Iranian companies. The result indicates that there is a significant positive relationship between degree of electronic commerce adoption and stages of electronic commerce development in the companies. Based on the findings and test of the framework, it will present necessary guidelines for evaluating electronic commerce adoption. 相似文献
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Alireza Karimi Reza Razaghi Seyed Mohammadali Rahmati Toshihiro Sera Susumu Kudo 《Sports Engineering》2018,21(4):359-365
Eye injuries from blunt forces and penetrating objects can cause morbidity, disability, and blindness. Most of these injuries are preventable not only by understanding the detail of injury, but also by portraying the role of the ball’s characteristics. Basketball can induce severe forms of injuries to the eye. This study was aimed at performing a numerical analysis through the fluid–structure interaction on ocular trauma. Balls with different diameters, elastic moduli, and pressures were shot to the eye. Injury in terms of the stresses and deformations in each component of the eye was computed at ~?0.72 mm deformation in the apex of the cornea. By increasing the diameter of the ball from 20 to 26 cm the stress in the eye components, excluding the aqueous body, vitreous body, and extraconal fat, increased. Stresses of 2.68 and 3.19 MPa were observed in the cornea under the ball diameters of 20 and 26 cm, respectively. Conversely, the elastic modulus and pressure of the ball in the defined range showed no considerable role on the stress in the eye components. The results revealed the importance of the ball size compared to the elastic modulus and pressure in the stress accumulation as a result of ocular trauma. 相似文献
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软件的修改管理问题是信息系统开发中的一个重要问题,该问题也是软件工业中所面临的十分重要的挑战。因此,现代的软件修改管理工具,或着称为配置控制工具,必须能对影响软件开发中的各种修改进行有效的管理。本文就此问题进行了探讨。 相似文献
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We examined how subjective assessments of recollection guide decision making. Subjective recollection was dissociated from accuracy during a forced-choice recognition task. Distracters were either similar to targets (match condition) or to other studied, but untested items (nonmatch condition). We assessed 223 participants (112 males) across three experiments (137 White, 37 Asian-American, 7 African-American, 4 American-Indian, 32 mixed race, 6 undisclosed). In Experiment 1, 6- to 10-year-olds and adults (N = 119) were less accurate (d = 0.70), but more likely to claim subjective recollection and make memory selections in anticipation of a reward in the nonmatch condition (ds = 0.64–0.70). This pattern was eliminated in 6- to 7-year-olds when we limited the number of selections (Experiment 2, N = 52), but was replicated when we required the selections to be counted (Experiment 3, N = 52), underscoring the effects of decision complexity on children’s self-reflections. 相似文献
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ABSTRACT Historic rock reliefs are magnificent monuments that represent special events of the past. Due to exposure to the natural environment, these monuments are affected by natural and human erosion mechanisms. Many of them have disappeared over time and are no longer recognizable. This research seeks to find a way to understand the initial shapes of the rock reliefs that have been exposed to steady and prolonged erosion. For this purpose, a case study was selected in southern Iran that has been damaged over hundreds of years by a stream of water and has partially disappeared. The water flow has caused a groove to be formed along the cliff and apparently a strip of the relief has disappeared. Documenting the inner surface of the groove revealed that this surface is not smooth and there are still remnants of unclear reliefs in eroded sections. By examining the erosion effects on initially vertical smooth sections, it was possible to arrive at a formula to determine the damage caused by the water flow on cliffs. Based on this, it was determined to what extent the water flow had reduced the amount of rock at each height. Accordingly, each level of the damaged relief was virtually moved forward to the same extent. In this way, parts of the disappeared rock relief were virtually rebuilt. The results of this study showed that by measuring the gradual and continuous erosion factors and determining the extent of damage, the original shape of the damaged rock reliefs could somehow be reconstructed. 相似文献