浅谈网络环境下的信息检索效率

网络环境下，信息检索效率主要是指检全率和检准率，它们之间存在互逆、互顺等关系。许多因素影响着检索效率，文章提出了提高检索效率的各种策略，并且展望了其发展趋势。     

浅谈钢琴乐谱的记忆

识记、保持、再认或回忆是记忆的基本环节，文章通过对钢琴乐谱记忆过程的分析提出了乐谱记忆的六个步骤和方法。     

信息检索中修饰语作用的研究

在海量信息中检索时,与用户查询相关的信息常常被漏掉,而与查询无关的信息———信息垃圾,却大量地出现在检索结果中。改进文本信息检索系统的质量,提高检索效能,已成为亟待解决的问题。本文针对能够影响检索效力的一个易被忽略的因素———修饰语,研究其在文本信息检索中的作用。为此,构建了修正的向量空间模型(Modified Vector Space Model,MVSM),并以英文文本进行试验,进而说明修饰语的作用。     

物理教学中挖掘想象潜力之我见

本文结合物理教学实际,从注重培养学生的想象能力着手,就回想、联想、猜想三种挖掘想象潜力的手段进行了论证。     

迟子建小说文本的人文关怀

迟子建在叙事艺术上着意经营,擅长以温情的笔调讲述“东北家园”伤怀之美故事,尤其是对童年情结梦忆、生态文学写作、精神生态追怀的书写,独具特色富于美学意味,由此建构了她小说文本的人文关怀,使读者在阅读中分明感觉到她的艺术气质和艺术审美,卓尔不群、非同一般。     

NAS在电信网中的应用

网络接入服务器(NAS)位于公共电话网PSTN或综合业务数字网ISDN与Internet之间,为远程用户提供Internet接入能力,多链路捆绑、回呼等,并根据当前电信网现状,结合设备特点为电信运营商、ISP等提供了优选的设备组网方案.     

MeSH and text-word search strategies: precision,recall, and their implications for library instruction

Objective:This study compared the recall and precision of MeSH-term versus text-word searching to better understand psychosocial MeSH terms and to provide guidance on whether to include both strategies in an information literacy session or how much time should be spent on teaching each search strategy.Methods:Using the relevant recall method, a total of 3,162 resources were considered and evaluated to form a gold standard set of 1,521 relevant resources. We compared resources discussing psychosocial aspects of children and adolescents living with type 1 diabetes using two search strategies: text-word strategy versus MeSH-term strategy. The frequency of MeSH terms, the MeSH hierarchy, and elements of each search strategy were also examined.Results:Using the 1,521 relevant articles, we found that the text-word search strategy had 54% recall, while the MeSH-term strategy had 75% recall. Also, the precision of the text-word strategy was 34.4%, while the precision of the MeSH-term strategy was 47.7%. Therefore, the MeSH-term search strategy yielded both greater recall and greater precision. The MeSH strategy was also more complicated in design and usage than the text-word strategy.Conclusions:This study demonstrates the effectiveness of text-word and MeSH search strategies on precision and recall. The combination of text-word and MeSH strategies is recommended to achieve the most comprehensive results. These results support the idea that MeSH or a similar controlled vocabulary should be taught to experienced and knowledgeable students and practitioners who require a myriad of resources for their literature searches.     

检索效率的图示初探

通过一个综合的图形和对检全率和检准率的影响因素的分类，讨论了检全率与检准率的关系及其检索效率的定量衡量。     

Children’s recall and motivation for an environmental education video with supporting pedagogical materials

This study examined recall (Rcl) differences of high, average and low achieving fifth-grade elementary students (72) for an environmental education video with supporting pedagogical materials. In addition, it assessed the motivational level of all students. Recall assessment was carried out one-week and twenty-weeks after intervention. Main findings suggest comparative Rcl results for all achievers and high motivation for the designed video and pedagogical materials. Implications for future research and for an integrative materials’ design approach are presented.     

图书超期问题与人性化预警

为解决图书超期问题,图书馆普遍采用超期罚款举措;在实际操作中这一举措问题种种,不能从根本上遏制或减少超期现象;必须开辟图书催还业务。