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81.
对两斑块环境下具有存放率的单种群扩散系统进行了定性的研究 ,得出了在扩散系数不太大的条件下种群具有稳定的状态的结论 . 相似文献
82.
North and South Kivu provinces in the Eastern part of the Democratic Republic of the Congo (DRC) are still confronted by both natural and manmade disasters and are potentially exposed to carbon dioxide and methane from Lake Kivu. For people living in those areas, it is important to have constant access to real-time situational information to prevent fatal dangers. Our study aims at examining the adoption factors of social media and the impact of their use in managing disaster. We proposed and empirically validated a research model drawn on three combined theories: TAM, the diffusion-of-innovation theory and the Kahn’s framework of psychological conditions and agility. The obtained model was tested with a sample of 418 respondents using the Partial Least Squares Structural Equation Modelling method (PLS-SEM). The study revealed the following two main outputs: (i) social media platforms are perceived to be easy to use, useful with a perceived relative advantage, and are therefore essential for disaster management; and (ii) the use of social media impacts information accessibility, adaptability, proactiveness and resilience. 相似文献
83.
《Communication monographs》2012,79(4):336-359
To date, researchers have not studied the relationship between the mental representation of interpersonal problem situations and interpersonal communication used to manage problem situations. This report examined the relationship between four types of communication (i.e., integrative, distributive, indirect, and avoidance) and fourteen perceptions of problem situations (i.e., problem uniqueness and frequency; goal importance, complexity, and mutuality; uncertainty about the other, relationship, and goal‐path; causal attribution to the self, other, intent of the other, relationship, and environment; and feelings for the other). Two studies tested hypotheses. The first study used self‐reports based on personally experienced problem situations to examine the relationship between the perceptions and perceived use of the types of communication. The second study explored the relationship between communication stimuli likely to be used in problem situations and the likelihood of the conceptualization perceptions. Results generally confirmed the hypotheses in both studies and indicated that a relatively specific relationship exists between each type of communication and the set of perceptions for both personally experienced and undefined problem situations. Implications of these results for problem‐related knowledge structures, problem solving, conflict, relationship intervention, and interpersonal influence were discussed along with directions for future research. 相似文献
84.
正态偏差策略是当下国际发展传播学研究与实践的热点之一。本文对其概念、发展脉络、理论来源进行了梳理。作者认为,正态偏差策略在继承经典创新扩散理论的基础上,从另一向度拓展了经典创新扩散理论的研究视野和实践空间,并对新阶段中国西部大开发中传播功能的定位、乡土创新与传播机制的设计有诸多有益启示。 相似文献
85.
College students use technology to gather information and conduct their daily lives. Textbooks increasingly relate course content to students through technology. An analysis of the top ten public speaking textbooks revealed the ways in which technology is addressed within information-gathering chapters. Seven areas of technology were identified: search engines/conducting searches, the Internet, general computing, non-computer technologies, technology applications, technology in general, and the provision of Website addresses. Chi-square tests showed significant differences in the coverage of the technology topics. Instructors can make more informed textbook selections as a result of this investigation. Technology is essential to the information gathering process, and this study suggests how its treatment may be more beneficial to both students and instructors. 相似文献
86.
From 1998 through 2001, South Korea witnessed a remarkable diffusion in broadband Internet connections. Using published and other data, this paper explores the actions and factors contributing to this diffusion from three viewpoints: government, private sector, and social. We suggest that the matching of demand and supply is the most important factor in the fast diffusion of broadband in Korea. In particular, fierce infrastructure competition led to quality services at a low fixed price. Online gaming exhibits some of the characteristics of a "killer application"; there are also some social and cultural drivers of demand. We then consider the impact that this rapid diffusion has had on electronic commerce. We produce conclusions of value to policymakers. 相似文献
87.
Eric Brousseau 《The Information Society》2013,29(1):45-57
France's early adoption of Minitel and EDI in the 1980s was both a stimulus and an inhibitor to Internet-based e-commerce. It hindered the adoption of the Internet, but it also created the conditions for a rapid catch up when France switched to the Internet in 1997. The French were already open to the use of IT, a dense network of online specialists and information service providers already existed, and many investments required to go digital were already made. On the other hand, by mid-2001 France was still far behind the early adopters of e-commerce over the Internet. This is because the French catch-up was checked by the implosion of the Internet financial bubble in 2000. Second, many Internet-based business models did not fit the French distribution channels. These differences suggest that e-commerce paths of development can be differentiated among nations, because both needs and solutions differ. This conclusion goes against the conventional wisdom that e-commerce will lead to the emergence of an integrated global marketplace in which common commercial practices will be implemented. 相似文献
88.
The Danish e-commerce strategy is a highly ambitious effort to become the world's leading IT nation. Instead of a production-led approach aimed at stimulating domestic hardware and software production, Denmark has pursued a demand-oriented approach focused on promoting the widespread adoption of e-commerce in the Danish society. The Danish government has developed a number of e-commerce initiatives via public-private sector partnerships--an approach we refer to as "governance." So far, it appears that Denmark has been successful in promoting business-to-business (B2B) e-commerce, with a number of Danish companies being global leaders in the use of B2B applications. On the other hand, Denmark has had less success in achieving widespread use of business-to-consumer (B2C) e-commerce. This article analyzes the Danish national environment for e-commerce, discusses four sets of governance initiatives aimed at the development of e-commerce, and analyzes the reasons for its success in B2B and relative failure in B2C adoption. 相似文献
89.
90.
In 2009, the departments in the executive branch of the U.S. federal government received the presidential marching order to “harness new technologies” in order to become more transparent, collaborative and participatory. Given this mandate, this article sets out to provide insights from qualitative interviews with social media directors to understand the factors that influence internal adoption decisions to use social media applications, such as Facebook, Twitter, or blogs. Three distinct factors influence the adoption decisions of social media directors: information about best practices in their informal network of peers, passive observations of perceived best practices in the public and private sector, and “market-driven” citizen behavior. The resulting adoption tactics include: (1) representation, (2) engagement, and (3) networking. The findings point to the need for higher degrees of formalized knowledge sharing when it comes to disruptive technology innovations such as social media use in highly bureaucratic communication environments. Recommendations based on the lessons learned are provided for practitioners and social media researchers to develop social media tactics for different organizational purposes in government. 相似文献