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浏览/检索结果: 共8条，第1-8条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Does computer-assisted learning improve learning outcomes? Evidence from a randomized experiment in migrant schools in Beijing SCI/SSCI论文 2015 作者:  Lai F.;  Luo, R. F.;  Zhang, L. X.;  Huang, X. Z.;  Rozelle, S. 收藏  |  浏览/下载：17/0  |  提交时间：2015/12/09 Education  Development  Computer-assisted learning  Random assignment  Test scores  China  Migration  public-schools  education  children  india  state   The impact of teacher training on teacher and student outcomes: evidence from a randomised experiment in Beijing migrant schools SCI/SSCI论文 2013 Zhang L. X.; Lai F.; Pang X. P.; Yi H. M.; Rozelle S. 收藏  |  浏览/下载：15/0  |  提交时间：2014/12/24 education  development  inservice teacher training  random assignment  test scores  China  migration  achievement  children  state   Computer assisted learning as extracurricular tutor? Evidence from a randomised experiment in rural boarding schools in Shaanxi SCI/SSCI论文 2013 Lai F.; Zhang L. X.; Hu X.; Qu Q. H.; Shi Y. J.; Qiao Y. J.; Boswell M.; Rozelle S. 收藏  |  浏览/下载：22/0  |  提交时间：2014/12/24 education  development  computer assisted learning  random assignment  test scores  China  rural schools  public-schools  china  impact   An efficient discrete particle swarm algorithm for task assignment problems (EI CONFERENCE) 会议论文 2009 IEEE International Conference on Granular Computing, GRC 2009, August 17, 2009 - August 19, 2009, Nanchang, China Yang Q.; Zhang C.; Wang C. 收藏  |  浏览/下载：12/0  |  提交时间：2013/03/25 Task Assignment Problems (TAPs) in distributed computer system are general NP-hard and usually modeled as integer programming discrete problems. Many algorithms are proposed to resolve those problems. Discrete particle swarm algorithm (DPS) is a newly developed method to solve constraint satisfaction problem (CSP) which has advantage on search capacity and can find more solutions. We proposed an improved DPS to solve TAP in this paper. DPS has a special operator namely coefficient multiplying speed  which is designed for CSP but does not exist in other discrete problems. Thus we redefined a coefficient multiplying speed operator with probability selection. We analyzed the speed and position updating formula then we derived a refined position updating formula. Several experiments are carried out to test our DPS. Experimental results show that our algorithm has more efficient search capacity  higher success rate  less running time and more robust.   Understanding population structure and historical demography in a conservation context: population genetics of an endangered fern 期刊论文 DIVERSITY AND DISTRIBUTIONS, 2008, 卷号: 14, 期号: 5, 页码: 799-807 作者:  Kang, Ming;  Huang, Hongwen;  Jiang, Mingxi;  Lowe, Andrew J. 收藏  |  浏览/下载：9/0  |  提交时间：2017/04/13 Adiantum reniforme var  sinense  assignment test  conservation  endangered fern  equilibrium  gene flow  isolation by distance  microsatellite   Demographic bottlenecks and low gene flow in remnant populations of the critically endangered Berchemiella wilsonii var. pubipetiolata (Rhamnaceae) inferred from microsatellite markers 期刊论文 CONSERVATION GENETICS, 2008, 卷号: 9, 期号: 1, 页码: 191-199 作者:  Huang, Hongwen;  Kang, Ming;  Wang, Jing 收藏  |  浏览/下载：13/0  |  提交时间：2017/04/13 assignment test  Berchemiella wilsonii var. pubipetiolata  equilibrium  gene flow  microsatellite   Control strategies and experimental verifications of the electromagnetic mass damper system for structural vibration control 期刊论文 EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION, 2008, 卷号: 7, 页码: 181-192 作者:  Zhang Chunwei;  Ou Jinping 收藏  |  浏览/下载：2/0  |  提交时间：2019/12/27 structural vibration control  electromagnetic mass damper (EMD) system  control strategy  shaking table test  pole assignment  control robustness   一种静态最少优先级分配算法 期刊论文 软件学报, 2007, 卷号: 18, 期号: 7, 页码: 1844-1854 邢建生; 王永吉; 刘军祥; 曾海涛 收藏  |  浏览/下载：22/0  |  提交时间：2010/08/17 实时系统  静态优先级调度  有限优先级  优先级分配  可调度判定  性价比  real-time system  static priority scheduling  limited priority level  priority assignment  schedulability test  performance/price ratio