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1.
This paper addresses some of the requirements of the advance organizers and prediction activities for DDL(Data-Driv en Learning) based on multi-modal corpora for learning English as a second language.It analyzes preliminary advantages and dis advantages of using multi-modal corpora for DDL and focuses on key methodological issues related to self-guided learning and corpus operation.Pedagogical suggestions are provided on how to make the multi-modal corpora based DDL engaging in accor dance with Krashen’ s Language Input Hypothesis with the assistance of advance organizers and prediction activities. 相似文献
2.
闲暇道德教育具有教育时空的变化性、教育形式的多样性、教育对象的多层次性等特点,大学生良好闲暇道德的形成需要长期的过程。只有遵循大学生闲暇活动和道德教育规律,探索独具特色的大学生闲暇道德教育机制,才能为实现其闲暇道德教育高效的目标提供保障。 相似文献
3.
The aim of this research was to examine the type of activities as well as the challenges faced by befrienders supporting persons with autism spectrum disorders (ASD). Twenty-nine volunteers befriending an equal number of families with children with ASD participated in this study. Content analysis was applied on visit logs (n = 465) completed by befrienders during a nine month period, supplemented by thematically analysed evidence derived from semi-structured interviews with befrienders at the end of their volunteering experience. In agreement with our expectations, findings indicate a variation in the type, number and location of activities as well as the challenges of befrienders, depending on the level of ability of persons with ASD. Befrienders in both groups were mostly involved in leisure activities, had greater social interaction with the high functioning autistic group and carried out more structured 1:1 activities with individuas with low functioning autism. Interestingly, befrienders in both groups did not differ significantly on their reported challenges. The implications of this befriending service as a means of social support for families with persons with ASD are discussed. 相似文献
4.
1IntroductionBackground subtraction methods are extensively ex-ploited for moving object detection in videos in manyapplications ,such as traffic monitoring[1],human mo-tion capture[2]and video surveillance[3]. The centralidea behind such methods is to segment foreground ini mage sequences taken from a fixed camera by com-paring each newframe to a model of the scene back-ground . Therefore , correctly and efficiently modelingand updating the background model is one of the mostchallenging aspec… 相似文献
5.
谢蓉蓉 《宁波广播电视大学学报》2011,9(2):77-81
网络课程随着数字信息技术和网络技术的发展而发展,基于多模态话语分析理论与功能语言学理论,网络课程发展的理想模式是构建逼真的三维或四维学习情境,刺激学习者的多种感官,让学习者身临其境地参与学习活动,从而顺利地完成意义构建,实现学习目的。“虚拟现实”技术的发展为网络课程理想模式即多模态虚拟课程的出现带来了可能。通过对多模态虚拟课程内涵、分类和特性的阐述,可以对网络课程的发展进行展望和分析。 相似文献
6.
介绍了一种基于多重隐马尔克夫模型(Multiple HMM——MHMM)的手写体汉字识别新方法。该方法首先提取基于区域投影变换形成的边界链码特征,对每个汉字建立4个HMM,通过等比重综合方法将4个分类器的计算结果进行综合,从而得到识别结果。实验结果证明该方法较传统的HMM具有更高的抗干扰能力和更高的识别率。 相似文献
7.
With the rapid growth of the Web, the volume of information on the Web is increasing exponentially. However, information on the current Web is only understandable to humans, and this makes precise information retrieval difficult. To solve this problem, the Semantic Web was proposed. We must use ontology languages that can assign data the semantics for realizing the Semantic Web. One of the representative ontology languages is the Web ontology language OWL, adopted as a recommendation by the World-Wide Web Consortium （W3C）. OWL includes hierarchical structural information between classes or prop- erties. Therefore, an efficient OWL storage model that considers a hierarchical structure for effective information retrieval on the Semantic Web is required. In this paper we suggest an XPath-based OWL storage （XPOS） model, which includes hierarchical information between classes or properties in XPath form, and enables intuitive and effective information retrieval. Also, we show the comparative evaluation results for the performance of the XPOS model, Sesame, and the XML file system-based storage （XFSS） model, in terms of query processing and ontology updating. 相似文献
8.
In psychological, social, behavioral, and medical studies, hidden Markov models (HMMs) have been extensively applied to the simultaneous modeling of heterogeneous observation and hidden transition in the analysis of longitudinal data. However, the majority of the existing HMMs are developed in a parametric framework without latent variables. This study considers a novel semiparametric HMM, which comprises a semiparametric latent variable model to investigate the complex interrelationships among latent variables and a nonparametric transition model to examine the linear and nonlinear effects of potential predictors on hidden transition. The Bayesian P-splines approach and Markov chain Monte Carlo methods are developed to estimate the unknown, a Bayesian model comparison statistic, is employed to conduct model comparison. The empirical performance of the proposed methodology is evaluated through simulation studies. An application to a data set derived from the National Longitudinal Survey of Youth is presented. 相似文献
9.
张青 《湖南师范大学教育科学学报》2010,9(5)
网络空间中师生的匿名性,师生主体的去中心化的特质,打破了面对面教育中以身份地位为主导的教育社会分层结构,教师角色中知识源泉的作用将部分由网络资源替代,网络空间中的人际交往活动频繁,这些正加速促进教师权威者角色与教育理念的转型。 相似文献
10.
Marginal likelihood-based methods are commonly used in factor analysis for ordinal data. To obtain the maximum marginal likelihood estimator, the full information maximum likelihood (FIML) estimator uses the (adaptive) Gauss–Hermite quadrature or stochastic approximation. However, the computational burden increases rapidly as the number of factors increases, which renders FIML impractical for large factor models. Another limitation of the marginal likelihood-based approach is that it does not allow inference on the factors. In this study, we propose a hierarchical likelihood approach using the Laplace approximation that remains computationally efficient in large models. We also proposed confidence intervals for factors, which maintains the level of confidence as the sample size increases. The simulation study shows that the proposed approach generally works well. 相似文献
11.
黄治国 《黄河科技大学学报》2012,40(3):44-47
河南涉台名人旅游资源极为丰富,包括信仰名人、姓氏始祖名人及涉台军政名人资源。,通过学术研讨、举办文化节等多种活动,可以丰富、提升涉台名人文化内涵及知名度;也可开辟涉台名人踪迹游览线、整合相关涉台名人资源,从而促进河南涉台名人资源的可持续开发利用。 相似文献
12.
ZHUHong FENGYu－cai 《上海大学学报(英文版)》2001,5(4):299-307
This paper propses a security policy model for mandatory access control in class B1 database management system whose level of labeling if tuple.the relation-hierarchical data model is extended to multilevel relation-hierarchical data model.Based on the multievel relation-hierarchical data model,the concept of upper-lower layer relational integrity is presented after we analyze and eliminate the covert channels caused by the database untegrity,Two SQL statements are extended to process polyinstantiation in the multilevel secure environment.The system is based on the multievel relation-hierarchical data model and is capable of integratively storing and manipulating multilevel complicated objects(e.g.,multilevel spatial data) and multievel conventional data(e.g.,integer,real number and character string). 相似文献
13.
This article describes a theory of scientific discovery learning which is an extension of Klahr and Dunbar's model of Scientific Discovery as Dual Search (SDDS) model. We present a model capable of describing and understanding scientific discovery learning in complex domains in terms of the SDDS framework. The concepts of hypothesis space and experiment space, central to SDDS, are elaborated and used as a representation of the learner's knowledge. Also, we introduce a taxonomy of search operations in hypothesis space which allows us to describe in detail the processes of discovery. Our ideas are tested against data of subjects who comment on the discovery processes of a simulated learner. It is found that the conditions for performance a search operation in hypothesis space include both sufficient knowledge of the search operation itself and reasons for choosing a specific search operation. Furthermore, a number of constraints on the search in hypothesis space is discussed: domain specific and generic prior knowledge, learning goals, and personality factors. We conclude with some recommendations for the design of discovery-based learning environments. 相似文献
14.
《Early childhood research quarterly》2006,21(3):313-331
The IEA Preprimary Project is a longitudinal, cross-national study of preprimary care and education designed to identify how process and structural characteristics of the settings children attended at age 4 are related to their age-7 cognitive and language performance. Investigators collaborated to develop common instruments to measure family background, teachers’ characteristics, setting structural characteristics, experiences of children in settings, and children's developmental status. Data from 10 countries are included in the analysis; in most countries, the sample of settings is representative of preprimary settings in that country. For the analysis, a 3-level hierarchical linear model was employed that allowed decomposition of variation of child outcomes into three parts—variation among children within settings, among settings within countries, and among countries. Four findings are consistent across all of the countries included. Age-7 language improves as teachers’ number of years of full-time schooling increases and the predominant type of activity teachers propose in settings is free choice rather than personal/social. Age-7 cognitive performance improves as children spend less time in whole group activities and the variety of equipment and materials available increases. There were also a number of findings that varied across countries depending on particular country characteristics. The findings support child-initiated activities and small group activities and are consistent with developmentally appropriate practices promoting active learning. 相似文献
15.
The authors review and integrate certain diverse theories to explain and suggest appropriate interventions for difficulties in socioemotional functioning experienced by many deaf persons. These diverse perspectives include a hierarchical circular systems approach, psychosocial stage theory, social learning theory, and representational models, or evolving expectancies of others. These perspectives, which can facilitate understanding of social behaviors and development and lead to improved interventions, provide background for a 3-level model proposed in the article. The model focuses on the relationship between the deaf person and the proximal social environment. The model's first level takes into account intrapsychic processes such as self-concept; the second highlights reciprocal interactions between the person and the social environment. The third describes the resulting memories and expectancies that develop and evolve and that influence the person's previous intrapsychic thoughts, feelings, and perceptions. These, in turn, affect social interactions, in a recurrent, spiraling fashion. This hierarchical model can be used as a framework for concurrent or sequential interventions with Deaf people. 相似文献
16.
ABSTRACT This study aimed to investigate older adults’ daily activities (e.g., learning activities and companionship) and the relations of these activities with the satisfaction of the basic psychological needs using the Experience Sampling Method (ESM). We propose a multilevel model to delineate the effects of daily experiences on the satisfaction of autonomy, competence, and relatedness needs. The current research was conducted by sending reminder messages and collecting daily responses via the Line@ application on mobile phones. A total of 838 valid records were collected (the average number of records per person was 24.65). In total, 838 daily experiences nested 34 older adults’ completed diary records for the study. The average age was 63.44 years (SD age = 5.90, range from 52 to 75), and 82.4% were female (i.e., 28 women and 6 men). Each participant needed to complete their record each day throughout the 10-day period. The results of hierarchical linear modeling (HLM) revealed that learning for the elderly, as compared with doing all other activities, is positively related with the satisfaction of the autonomy need but negatively associated with the satisfaction of the competence need. Furthermore, eating as compared with learning for older adults is more likely to satisfy the competence and relatedness needs; however, learning as compared with watching TV may foster satisfaction of the autonomy, competence, and relatedness needs. In addition, as long as they are accompanied, regardless of who their companions are, compared with being alone, the older adults perceived greater satisfaction of the three basic psychological needs. 相似文献
17.
Joost Meijer Marcel V. J. Veenman Bernadette H. A. M. van Hout-Wolters 《Educational Research and Evaluation》2013,19(3):209-237
This article describes the construction of a hierarchical taxonomy of metacognitive activities for the interpretation of thinking-aloud protocols of students in secondary education, who studied texts on history and physics. After testing an initial elaborate taxonomy on a restricted number of protocols by multiple raters, it appeared that the interrater correspondence was well below par. The categories in the taxonomy were too highly specified. Categories were combined and tested on new protocols in a cyclic fashion. The revised taxonomy was then used for coding 16 history protocols and 16 physics protocols. Frequencies of occurrence of metacognitive activities were obtained, as well as judgements of the quality of the metacognitive activities of the participants. There is a reasonable correlation between the frequency method and the quality method for coding thinking-aloud protocols. Also, there is a substantial covariation of the number of metacognitive activities across both tasks. 相似文献
18.
提出一种提取手势轮廓轮廓看成一条曲线,采用HDC(Hierarchical Discrete Correlation)方法用一个内核对曲线进行多次平滑,得到曲线的尺度空间,再通过跟踪曲线在尺度空间中的运动找出手势轮廓的关键点,最后通过最小距离法对手势进行识别. 相似文献
19.
This article proceeds from the assumption that the aging of American society has consequences for the life roles of midlife and older persons. Seven points are developed in support of the assumption. They are as follows: dynamics and demographics of an aging population; education, a critical component of life in the future; a model of education for older adults; new roles for an aging society; literacy for older persons; older persons' activities in pursuit of lifelong education; and a view of the future that includes lifelong education for lifelong needs. The final section offers some speculations about what lifelong education will be like in 2010. 相似文献
20.
This paper deals with the statistical modeling of latent topic hierarchies in text corpora. The height of the topic tree is assumed as fixed, while the number of topics on each level as unknown a priori and to be inferred from data. Taking a nonparametric Bayesian approach to this problem, we propose a new probabilistic generative model based on the nested hierarchical Dirichlet process （nHDP） and present a Markov chain Monte Carlo sampling algorithm for the inference of the topic tree structure as well as the word distribution of each topic and topic distribution of each document. Our theoretical analysis and experiment results show that this model can produce a more compact hierarchical topic structure and captures more fine-grained topic relationships compared to the hierarchical latent Dirichlet allocation model. 相似文献