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网络信息寻求行为研究理论框架之活动理论 被引量:14
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作者 杨玉芹 《远程教育杂志》 CSSCI 2008年第5期19-23,共5页
本文尝试对网络信息寻求行为研究框架——活动理论,及其在信息寻求研究中的适切性进行论述,并尝试给出活动过程模型。
关键词 信息寻求行为 活动理论 活动过程模型
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A risky asset model based on Lvy processes and asymptotically self-similar activity time processes with long-range dependence
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作者 WANG DingCheng 《Science China Mathematics》 SCIE 2013年第11期2353-2366,共14页
In the paper, using Levy processes subordinated by 'asymptotically self-similar activity time' pro- cesses with long-range dependence, we set up new asset pricing models. Using the different construction for gamma ... In the paper, using Levy processes subordinated by 'asymptotically self-similar activity time' pro- cesses with long-range dependence, we set up new asset pricing models. Using the different construction for gamma (F) based 'asymptotically self-similar activity time' processes with long-range dependence from Fin- lay and Seneta (2006) we extend the constructions for inverse-gamma and gamma based 'asymptotically self- similar activity time' processes with integer-vMued parameters and long-range dependence in Heyde and Leo- nenko (2005) and Finlay and Seneta (2006) to noninteger-valued parameters. 展开更多
关键词 activity time asset pricing model asymptotical self-similarities gamma process inverse-gammaprocess L4vy process long-range dependence SUBORDINATOR
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