On File Sharing With Indirect Network Effects Between Concert Ticket Sales and Music Recordings     

Ralf Dewenter  Justus Haucap  Tobias Wenzel 《Journal of Media Economics》2013,26(3):168-178

This article analyzes the interdependency between the market for music recordings on the one side and the market for concert tickets on the other side, assuming that there are positive indirect network effects both from the record market to ticket sales for live performances and vice versa. In a model with two interrelated Hotelling lines, prices in both markets are corrected downward when compared to the standard Hotelling model. In the integrated business model, file sharing has an ambiguous effect on firms' profitability. As file sharing can indirectly increase demand for live performances, overall profits can either increase or decrease, depending on the strength of indirect network effects. Finally, file sharing may induce firms to switch from the traditional business model with two separate firms to an integrated business model where one agency markets both records and concerts (so-called 360° deals).  相似文献   

How accurate are teacher and parent judgements of lower secondary school children’s test anxiety?     

Constance Karing  Tobias Dörfler  Cordula Artelt 《教育心理学》2015,35(8):909-925

This study examined teacher and mother judgement accuracy of children’s worries and emotionality in the school subjects of German and mathematics. The participants were 59 German language and 58 mathematics teachers, 572 mothers and their children at the end of Grade 6. The analyses for the total sample revealed weak-to-moderate correlations between adult’s and children’s perception of test anxiety. Moreover, we found that teachers overestimated children’s emotionality as well as children’s worry, whereas mothers underestimated children’s worry and overestimated children’s emotionality in both subjects. However, when looking at the highly test-anxious children, we found quite low correlations and an underestimation of children’s worry and emotionality in both school subjects. Thus, it seems important to provide teachers and parents with information about test anxiety and possibly training to improve their judgement accuracy because of moderating effects of test anxiety on achievement.  相似文献   

Lower extremity kinematics of athletics curve sprinting     

Tobias Alt  Kai Heinrich  Johannes Funken  Wolfgang Potthast 《Journal of sports sciences》2015,33(6):552-560

Curve running requires the generation of centripetal force altering the movement pattern in comparison to the straight path run. The question arises which kinematic modulations emerge while bend sprinting at high velocities. It has been suggested that during curve sprints the legs fulfil different functions. A three-dimensional motion analysis (16 high-speed cameras) was conducted to compare the segmental kinematics of the lower extremity during the stance phases of linear and curve sprints (radius: 36.5 m) of six sprinters of national competitive level. Peak joint angles substantially differed in the frontal and transversal plane whereas sagittal plane kinematics remained unchanged. During the prolonged left stance phase (left: 107.5 ms, right: 95.7 ms, straight: 104.4 ms) the maximum values of ankle eversion (left: 12.7°, right: 2.6°, straight: 6.6°), hip adduction (left: 13.8°, right: 5.5°, straight: 8.8°) and hip external rotation (left: 21.6°, right: 12.9°, straight: 16.7°) were significantly higher. The inside leg seemed to stabilise the movement in the frontal plane (eversion–adduction strategy) whereas the outside leg provided and controlled the motion in the horizontal plane (rotation strategy). These results extend the principal understanding of the effects of curve sprinting on lower extremity kinematics. This helps to increase the understanding of nonlinear human bipedal locomotion, which in turn might lead to improvements in athletic performance and injury prevention.  相似文献   

May Kantians commit virtual killings that affect no other persons?     

Flattery  Tobias 《Ethics and Information Technology》2021,23(4):751-762

Ethics and Information Technology - Are acts of violence performed in virtual environments ever morally wrong, even when no other persons are affected? While some such acts surely reflect deficient...  相似文献   

Custom Publishing in the UK: Rise of a Silent Giant     

Tobias Haeusermann 《Publishing Research Quarterly》2013,29(2):99-109

This paper examines and portrays the production side of the custom publishing field with a primary focus on the UK, especially Greater London. Despite its prevalence, custom publishing has not received the same attention from media scholars, which is mirrored by the sometimes inappropriate, and even confusing terminologies attached to it. Hence, this paper aims to offer definitions characterizing the custom publishing branch whilst assessing the weaknesses and ambiguities in current definitions used in marketing and communications literature. Whereas a number of themes emerge from the study, the main focus is to locate the industry within the broader field of cultural production. Based on sociologist Pierre Bourdieu’s field theory, the study looks at the heteronomous—and hence externally determined—principle inherent in the relationship between the contracting companies and the contracted writers. Furthermore, the research details the resources or capital, which form the basis of the publishers’ work, and how the struggle between the economic and symbolic capitals is manifested in the three pillars (the account managers, the editorial, and the design teams). Finally, it is argued that despite displaying many of the traits Bourdieu’s associates with a heteronomous field, custom publishers rely on an important degree of autonomy, which is institutionalized within the field itself.  相似文献   

On a proposed reorganization of the division of educational psychology 1     

Sigmund Tobias  Frank H. Farley 《教育心理学家》2013,48(2):248-261

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The expertise reversal effect and aptitude treatment interaction research (Commentary)     

Sigmund Tobias 《Instructional Science》2010,38(3):309-314

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Supporting students with autistic spectrum disorder (ASD) at secondary school: a parent and student perspective     

Adele Tobias 《Educational Psychology in Practice》2009,25(2):151-165

This paper describes a small‐scale research project undertaken in July 2007, which focused on a group of students with a diagnosis of autistic spectrum disorder (ASD) currently attending a mainstream secondary school. Three focus groups were held with students in Years 9 and 11 and with their parents in order to explore current practice on additional support at secondary school for students with ASD. Several aspects of support at school were positively evaluated by the participants. It also examines how support could be provided in the future to address perceived additional needs. It concludes with several implications for planning for support in the future.  相似文献   

It's never too late: Funding dynamics and self pledges in reward-based crowdfunding     

Paolo Crosetto  Tobias Regner 《Research Policy》2018,47(8):1463-1477

Crowdfunding recently emerged as an alternative funding channel for entrepreneurs. We use pledge-level data from Startnext, the biggest German platform, to gain insights on funding dynamics and pledgers’ motivations. We find that the majority of projects that eventually succeed are not on a successful track at 75% of their funding period. These late successes are boosted by information cascades during the final 25% of the funding duration. We conclude – in contrast with earlier literature – that project success is only partially path-dependent. While early pledges do anticipate project success, a lack of them does not necessarily mean that projects will fail. Interviews and questionnaire responses indicate that projects’ communication efforts play a role in making severely under track projects succeed eventually. Moreover, our dataset uniquely allows us to quantify the extent of self funding. Self pledges account for about 10% of all initial pledges and 9% of all pledges that secure funding. Nonetheless, the late surges at severely under track projects are mostly driven by external funders. Furthermore, we find no evidence of subsequent herding triggered by self pledges.  相似文献   

Lack of knowledge and fear of automation as factors in teachers’ attitudes toward programed instruction and other media     

Sigmund Tobias 《Educational technology research and development : ETR & D》1966,14(1):99-109

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