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Zip模的扩张(英文) 被引量:1
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作者 欧阳伦群 刘金旺 向跃明 《数学进展》 CSCD 北大核心 2014年第5期683-694,共12页
本文主要证明了:(1)如果右R-模MR是(α,δ)-compatible且(α,δ)-Armendariz,则右R[x;α,δ]-模M[x]是zip模当且仅当右R-模MR是zip模;(2)如果(S,<)是可消无挠严格序幺半群且M_R是S-Armendariz模,则右[[R^S,<]]-模[[M^S,<]]_([[... 本文主要证明了:(1)如果右R-模MR是(α,δ)-compatible且(α,δ)-Armendariz,则右R[x;α,δ]-模M[x]是zip模当且仅当右R-模MR是zip模;(2)如果(S,<)是可消无挠严格序幺半群且M_R是S-Armendariz模,则右[[R^S,<]]-模[[M^S,<]]_([[R^S,<]]是zip模当且仅当右R-模M_R是zip模;(3)如果M_R是reduced且σ-compatible模,G为序群,则Malcev-Neumann环R*((G))上模M*((G))_(R*((G)))是zip模当且仅当右R-模M_R是zip模;因此一些文献中关于zip环与zip模的部分结论可以看作是本论文相关结论的推论. 展开更多
关键词 zip zip模 Armendariz
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Understanding taxi driver's cruising behavior with ZIP model 被引量:1
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作者 宗芳 《Journal of Central South University》 SCIE EI CAS 2014年第8期3404-3410,共7页
The taxi drivers' cruising pattern was learned using GPS trajectory data collected in Shenzhen,China.By employing zero-inflated Poisson model,the impacts of land use and previous pick-up experience on cruising dec... The taxi drivers' cruising pattern was learned using GPS trajectory data collected in Shenzhen,China.By employing zero-inflated Poisson model,the impacts of land use and previous pick-up experience on cruising decision were measured.The cruising strategies of different types of drivers as well as the top one driver were examined.The results indicate that both land use and previous pick-up experience affect travel behavior with the former's influence(7.07×10-4 measured by one of the coefficients in zero-inflated Poisson model) being greater than the latter's(4.58×10-5) in general,but the comparison also varies across the types of drivers.Besides,taxi drivers' day-to-day learning feature is also proved by the results.According to comparison of the cruising behavior of the most efficient and inefficient driver,an efficient cruising strategy was proposed,that is,obeying the distribution of land use in choice of cruising area,while learning from pick-up experience in selection of detailed cruising location.By learning taxi drivers' cruising pattern,the development of measures of regulating travel behaviors is facilitated,important factor for traffic organization and planning is identified,and an efficient cruising strategy for taxi drivers is provided. 展开更多
关键词 taxi driver GPS CRUISE land use objective information subjective information
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