基于混合索引的中文全文检索系统研究   总被引：1，自引：0，他引：1  

靖培栋  宋雯斐 《中国图书馆学报》2008,34(1)

在中文全文检索系统中引入了混合索引,建立了混合索引之Hash索引,给出了Hash索引在内存中的存储结构,并给出了这种索引下的检索算法。这种索引既能保证索引的全面性,又能提高系统检索效率。通过实际构建系统,探讨了基于混合索引的中文全文检索系统的实现。  相似文献   

Private secondary schools in Indonesia: What is driving the demand?     

《International Journal of Educational Development》2016

Despite recent evidence that students in public schools significantly outperform their private school counterparts, private schooling continues to account for approximately 40% of secondary school enrolments in Indonesia. In an effort to explain this sustained demand, we combine analyses of PISA data with in-country interviews and school visits. Ultimately, we find that although government dependent private schools are underfunded with a high proportion of uncertified, underpaid teachers (with limited access to training and professional development), demand remains high due to their focus on religious training and education, as well as their ability to increase educational access for low-income families.  相似文献   

自动化集装箱码头自动导引小车与轨道式龙门起重机的协同调度     

杨勇生  冯有勇  梁承姬  许波桅  李军军 《上海海事大学学报》2017,38(2):1-6

为解决自动导引小车(Automated Guided Vehicle,AGV)与轨道式龙门起重机(Rail-Mounted Gantry Crane,RMG)的协同调度问题,考虑AGV和RMG的任务分配约束,以卸船作业最小完工时间为目标,建立混合整数规划(Mixed Integer Programming,MIP)模型.改变AGV,岸桥和箱区数量的配置,得出不同条件下的完工时间.对该问题设计两组算例:小规模算例采用CPLEX软件和遗传算法(Genetic Algorithm,GA)分别进行求解,通过结果对比验证GA的有效性;大规模算例采用GA求解,给出自动化码头设备调度优化方案.分析结果表明,卸船完工时间随着卸船任务量的增加而增加,随着AGV,岸桥和箱区数量的增加而减少,且AGV和岸桥数量的增加对完工时间的影响大于箱区数量的增加时完工数量的影响.  相似文献   

关于谱分解估计和方差分析估计在线性混合模型中的比较     

史建红 《长治学院学报》2003,20(5):1-5

在文献[1]中提出的谱分解估计是一种在线性混合模型中同时估计固定效应和方差分量的新方法.在本文中,我们对带有两个方差分量的线性混合模型进行了谱分解估计和方差分析估计的比较.得出了方差分量的这两种估计在某些条件下方差相等,而且谱分解估计具有一些方差分析估计的最优性.  相似文献   

WOMBAT A tool for mixed model analyses in quantitative genetics by restricted maximum likelihood （REML）   总被引：31，自引：0，他引：31  

Meyer K 《Journal of Zhejiang University. Science. B》2007,8(11):815-821

WOMBAT is a software package for quantitative genetic analyses of continuous traits, fitting a linear, mixed model; estimates of covariance components and the resulting genetic parameters are obtained by restricted maximum likelihood. A wide range of models, comprising numerous traits, multiple fixed and random effects, selected genetic covariance structures, random regression models and reduced rank estimation are accommodated. WOMBAT employs up-to-date numerical and computational methods. Together with the use of efficient compilers, this generates fast executable programs, suitable for large scale analyses. Use of WOMBAT is illustrated for a bivariate analysis. The package consists of the executable program, available for LINUX and WINDOWS environments, manual and a set of worked example, and can be downloaded free of charge from http://agbu. une.edu.au/~kmeyer/wombat.html  相似文献   

On the alleged intrinsic immorality of mixed martial arts     

Steven Weimer 《体育哲学杂志》2017,44(2):258-275

In two recent articles, Nicholas Dixon has argued that the intent to hurt and injure opponents which is essential to mixed martial arts (MMA) makes the sport intrinsically immoral. Although bondage, domination, sadism, and masochism (BDSM) also involves the intentional infliction of pain and injury, Dixon argues that it is morally permissible in many cases. In this paper, I examine the principle underlying Dixon's differentiation of MMA and BDSM. I argue that, when properly elaborated, that principle does not in fact condemn MMA as intrinsically immoral, but rather implies that the attitudes and actions of most autonomously consenting amateur MMA fighters and some autonomously consenting professionals are prima facie morally permissible.  相似文献   

混合溶剂稀溶液的沸点升高及其常数的推算     

刘金红 《南通职业大学学报》1999,13(3):47-49

本文对由混合溶剂形成的稀溶液的沸点升高及沸点升高常数的计算公式进行了理论推算，并应用于以苯一甲苯为混合溶剂的稀溶液体系，得到了与实验数据接近的较为满意的结果。  相似文献   

小鼠力竭运动后GSH变化及MDA、ATP与肌肉机能恢复关系的研究   总被引：1，自引：0，他引：1  

王耀光 《山东体育学院学报》1997,(3)

小鼠经 1 0天灌喂中药合剂后 ,安静时小鼠肌 MDA值明显降低 ,GSH值升高。力竭运动后 GSH、ATP、MDA值的恢复明显加快 ,其中 GSH值的加快提示 ,在恢复期内 GSH的变化可能对肌肉机能的恢复有重要意义。  相似文献   

混合式评审及其学术效果评析——以《经济研究》杂志为例     

聂致钢 《中国科技期刊研究》2015,26(11):1145-1150

[目的]探讨混合式评审是否是期刊论文的较为理想的评审方式。[方法]分析《经济研究》杂志近21年论文引用数据的阶段性差异来比较不同评审方式的效果。[结果]从月平均引用量和前30%高引用文章占总引用比例两个指标来看,混合式评审对于《经济研究》杂志而言优于匿名评审和公开评审。[结论]需要以实证数据为依据,进一步探讨何种评审方式最有利于学术发展。  相似文献   

城市公交车对双车道混合交通流的影响     

彭婷 《环球赛鸽科技》2014,(35)

城市道路上的车流主要是公交车和小汽车混合流,而一般交通流理论都是以小汽车流为对象进行研究和建模。基于运动波理论和线性元胞自动机模型,本文提出了一种宏观与微观空间表现尺度相结合的双车道混合交通流组合建模方法分析。  相似文献