面向信息检索的术语服务构建与应用研究

在信息检索中,叙词表作为一种辅助有效检索的工具变得日益重要。术语注册与术语服务是在网络环境下对叙词表进行维护和应用的一种理想方式,能够极大促进叙词表在信息检索中的应用。本文的研究重点是面向信息检索的术语服务构建与应用。首先,以《汉语主题词表》为来源词表,采用语义网技术和REST架构构建术语服务。其次,以“获取同义词”服务为例,对术语服务在图书馆OPAC系统和百度搜索引擎中的有用性进行测评,结果表明,采用这一服务使OPAC系统的F值提高13%,使百度搜索引擎的P@5查准率提高16%。最后,设计了四种术语服务在信息检索系统中的应用方式,即复选扩检式、单选替换式、混合式和自动扩检式,并采用用户测评法对这四种应用方式进行可用性测评,结果表明,复选扩检式是可用性最佳的术语服务应用方式。图13。表9。参考文献34。     

Facilitating knowledge construction by customized supportive services

This research is aimed to assist individual learners to construct knowledge in online learning through providing them with customized supportive services. The services go beyond simply presenting course materials, but supply a diverse range of technological facilities, tools and services to assist individual learners to progress in the learning process. In this paper, the theoretical background for facilitating construction of knowledge by individual learners is built at the first, through the review of constructivist theories for learning and the objectivist ones. Then, a general conceptual model to describe any number of practices in learning and teaching online is built. It will be used to customize online learning environments to cater for various different learning demands. The services to support the individual’s knowledge construction are identified based on the relevant theoretical background. After that, software agents are proposed to customize the supportive services for individual learners based on their particular learning characteristics. Next, the implementation of these services is investigated and a system prototype is reported. Finally the preliminary research result and the further work are presented.     

UNIVERSITY‐LEVEL GENERAL ENVIRONMENTAL EDUCATION

The author describes the development of environmental education at Kharkov University in the USSR. The uniqueness of the main programme in general ecodevelopmental education is that its basic disciplinary affiliation is geography, a deliberate choice made by the university authorities’ which the author amply justifies. In the process of explaining this choice, he presents eight theses with regard to the social demand for ecologists and the ecologization of education and what he believes to be the three principal bases for general environmental education at the university level.     

Algorithm for adaptively smoothing the log-periodogram

We use the principle of minimum cross entropy (MCE) to build a non-parametric adaptive algorithm for smoothing the log-transformed periodogram, and construct an optimal estimate for the spectral density function of a process. We show that this estimate minimizes the cross-entropy with the log-transformed spectral density function of the process. The method is non-parametric and performs very well for the case of processes having rapidly changing spectra that exhibits a variable order of smoothness. The algorithm is locally based on linearly approximating the information present in the process, and uses this approximation to allow the bandwidth of the spectral window in the smoothed log-periodogram to vary. We extend the algorithm empirically for better application to processes having mixed, narrow-band spectra. Comparisons with other currently used procedures are performed through the means of simulated examples.     

‘Trust me,I do not know what I am talking about!’: The voice of the teacher beyond the oath and blasphemy

Educational theorists ranging from Ivan Illich to Jan Masschelein and Maarten Simons have described institutionalized schooling as a modernized, secular church, full of rituals, sacraments, and various incantations. For them, the function of the teacher as priest and schooling as baptism is highly problematic, separating education from the common world. As such, the educational theology of the school needs to be suspended in order for educational life to take on new meaning beyond the sacraments of learning. To further this line of inquiry, we turn to the work of Giorgio Agamben on the oath and its originary function of guaranteeing the truthfulness of language (‘sacrament of language’). Insofar as the oath is also operable in learning (in the voice of the teacher), we argue that such operability can be suspended through a dialogic practice called ‘community of infancy’, thereby making possible new, profane forms of educational life beyond baptism.     

Minding mathematicians’ discourses in investigations of their feedback on students’ proofs: a case study

Educational Studies in Mathematics - This article presents a research apparatus for investigating and making sense of stories that emerge from feedback that mathematicians provide on...     

大中尺度波流相互作用理论的研究

介绍了作者所在课题组在瞬变波与纬向平均流的相互作用 ,重力波上传破碎对平均流拖曳的参数化问题 ,低频波能量频散的广义波射线理论和与地形有关的波流相互作用的理论及应用问题研究方面取得的进展。     

The Role of Attention in the Development of Short-Term Memory: Age Differences in the Verbal Span of Apprehension

In previous studies of memory span, participants have attended to the stimuli while they were presented, and therefore have had the opportunity to use a variety of mnemonic strategies. In the main portion of the present study, participants (first- and fourth-grade children, and adults; 24 per age group) carried out a visual task while hearing lists of spoken digits and received a post-list digit recall cue only occasionally, for some lists. Under these conditions, list information presumably must be extracted from a passively held store such as auditory sensory memory. The results suggest that each individual has a core memory capacity limit that can be observed clearly in circumstances in which it cannot be supplemented by mnemonic strategies, and that the capacity limit appears to increase with age during childhood. Other, attention-demanding processes also contribute to memory for attended lists.     

竞走裁判员观察状态与闪光融合频率

本文研究了竞走裁判观察状态与CFF的关系。结果表明:双眼的CFF 应作为竞走裁判员选材的生理指标;正常视力者和近视者的CFF都具备了观察竞走技术的视觉分辨能力;竞走裁判员应在自己所负责的裁判区域内适当走动,以减弱对不同颜色的CFF差异,获得竞走比赛公允的视觉监视环境;竞走比赛时应停止音乐等的播放,以便为竞走裁判员保持较高的CFF创造执裁视觉环境;从运动员利益出发,竞走运动员的着装颜色应首选红色     

天津市发展沿海都市型现代农业的SWOT分析

本文从天津农业发展的现状和问题出发,借助SWOT分析方法,系统地分析了天津发展沿海都市农业面临的优势、劣势与机会、挑战,剖析其特殊性,为提出发展天津沿海都市农业的任务和对策奠定了基础。