排序方式： 共有8条查询结果，搜索用时 530 毫秒
1
1.
More and more newspaper and magazine Web sites offer paid content. However, selling information goods at a price higher than the marginal cost means finding a strategy for product or price differentiation. A possible strategy to solve this problem is the bundling of information goods. In this article, we analyze empirically, with quantitative statistic methods, strategies for selling bundled and unbundled content on newspaper and magazine Web sites. This analysis is based on the theoretical approach of Bakos and Brynjolfsson (1996). The article shows that a cannibalization takes place if the same bundle of information goods is offered in offline (printed) and online (digital) media at the same time. Traditional bundling models work nonetheless in an online media if the online content is rebundled (e.g., as dossiers about a topic), but thereby do not compete with the printed version. 相似文献
2.
Asja Maass Kirsten Kollhörster Annemarie Riediger Vanessa MacDonald Arnold Lohaus 《European Journal of Psychology of Education - EJPE》2011,26(3):339-353
The present study focuses on the short-term effects of electronic entertainment media on memory and learning processes. It
compares the effects of violent versus non-violent computer game content in a condition of playing and in another condition
of watching the same game. The participants consisted of 83 female and 94 male adolescents with a mean age of 17.6 years.
The dependent variables are memory for previously learnt verbal and visual material, memory for media-related content and
physiological measures of stress (heart rate, cortisol, salivary alpha-amylase). Besides the group comparisons, potential
mediation effects and gender differences were examined. The results show that violent content leads to a poorer memory performance
for verbal material and to an increased heart rate. The heart rate, however, does not mediate the effect on memory performance.
Genders differ regarding their abilities to memorise verbal and visual material, with females showing a better performance
(independent of the experimental condition), and for memorising media-contents, where the males outperform females (also independent
of experimental condition). The study supports the assumption that violent and arousing media content has a negative short-term
effect on simultaneous information processing and learning and that there are gender-specific media effects. 相似文献
3.
4.
This study examines whether the assumptions of the Transtheoretical Model (TTM) are useful to evaluate the effectiveness of a school‐based stress prevention programme in adolescence to promote appropriate coping behaviour. The TTM assumes three consecutive phases in the adoption of behavioural patterns. Progress throughout the phases is promoted by three developmental determinants. It, therefore, was expected that programme participation is associated with a progression throughout the phases and with a change in the developmental determinants. Of 372 adolescents, aged between 13 and 16 years, 190 participated in a control condition and 182 in a stress prevention programme. Measurements were taken a week before (pre‐test), a week after (post‐test) and 12 weeks after the training (follow‐up‐test). Results indicated that adolescents in different phases of behaviour change report different numbers of stress symptoms. Programme participation is associated with a progression in phases which, however, was not stable after the programme had run its course. Besides this, adolescents in different phases benefit from participation differentially as different patterns of changes in the developmental determinants show. A systematic promotion in the different phases of behavioural change by integrating TTM‐tailored ‘tools’ into a stress management programme may improve participants’ intention and competence to actually show appropriate coping behaviour. 相似文献
5.
To assess predictions from social identity development theory (SIDT; Nesdale, 2004) concerning children's ethnic/racial prejudice, 197 Anglo-Australian children ages 7 or 9 years participated in a minimal group study as a member of a team that had a norm of inclusion or exclusion. The team was threatened or not threatened by an out-group that was of the same or different race. Consistent with SIDT, prejudice was greater when the in-group had a norm of exclusion and there was threat from the out-group. Norms and threat also interacted with participant age to influence ethnic attitudes, although prejudice was greatest when the in-group had an exclusion norm and there was out-group threat. The implications of the findings for SIDT are discussed. 相似文献
6.
Amanda M. Younger Robert W. Pettitt Patrick J. Sexton William J. Maass Cherie D. Pettitt 《Journal of sports sciences》2016,34(7):658-663
Epidemiological studies suggest that prolonged sitting increases all-cause mortality; yet, physiological causes underpinning prolonged sitting remain elusive. We evaluated cardiometabolic function during prolonged sitting (5 h) in 10 adults with and without 30 min of moderate exercise leading up to the sitting. Mean arterial blood pressure (MAP), heart rate (HR) and posterior tibial artery blood velocity were measured at baseline and every hour subsequently. Blood glucose was measured at baseline, 3 and 5 h, with consumption of a caloric beverage at 1 h. Seated MAP and HR values were ~17 mmHg (P < 0.001) and ~4 bpm (P < 0.05) higher for the moderate exercise versus sitting conditions. A ~ 4 cm·s?1 (16%) (P < 0.05) decline in posterior tibial artery blood velocity from prolonged sitting was observed, with no benefit conferred from moderate exercise. Postprandial glucose metabolism was not different between conditions (P > 0.05). We conclude prolonged sitting may be related to decreased posterior tibial artery blood velocity. Moreover, an acute bout of moderate exercise does not seem to attenuate cardiometabolic function during prolonged sitting in healthy, young adults. 相似文献
7.
Categorical perception is a phenomenon that leads people to group stimuli into categories instead of perceiving their natural continua. This article reviews the literature of two biases connected with categorical perception: categorical color perception and the other‐race effect. Although these two phenomena concern distant targets (colors and faces) and imply different biases (one attentional, one mnemonic), they share at least three commonalities. First, they both involve the chunking of continuous dimensions into categories. Second, adult categories are shaped by cultural processes. Third, infants' discrimination performance seems universal and guided by perception. In this article, it is proposed to look for a common developmental mechanism that clarifies the shift from a perceptual to a sociocognitive knowledge of the environment. New perspectives are discussed. 相似文献
8.
1