968 resultados para directed polymers in random environment


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One problem for hypertext-based learning application is to control learning paths for different learning activities. This paper first introduces related concepts of hypertext learning state space, then proposes an agent based approach used to provide kinds of adaptation for learning activities. Examples are given while explaining ways to realizing adaptive instructions. Possible future directions are also discussed at the end of this paper.

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This paper describes design guidelines of a programming environment for children, aiming to lower the barriers for children to learn programming. Our model called GBuilder has been developed on the basis of guidelines, with the express purpose of enabling and empowering the students to develop their own learning programs in survival literacy within enjoyable and fun environment.

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Purpose - To show that a key aspect of learning and development of individual employees is that of self-directedness. This paper will consider the role of the leader in facilitating workforce development in terms of employees' self-directedness for learning. The research was designed to investigate the views that 'learning leaders' in organizations have towards the development of self-directedness in employees; and to identify strategies that are feasible in developing self-directedness in operating organizations.

Design/methodology/approach - Draws on a national research project undertaken in 12 organizations in Australia, representing a range of sizes and a number of industry sectors. Data collection involved interviewing learning and development managers in each organization to gauge the relative feasibility of the implementation of a number of pre-identified strategies designed to develop self-directedness among employees within operating work environments.

Findings - Showed that: learning managers and leaders were generally well disposed towards the development of self-directedness, and some had already moved to do so; and identified a number of possible strategies for implementation of varying degrees of feasibility. The paper will consider these findings in relation to the concept of a 'learning leader'.

Research limitations/implications - Although the research was conducted in a diverse set of 12 enterprises, applicability of the results across an even wider set of enterprises would need to be tested.

Originality/value - The findings of this research provide guidance to learning and development personnel on feasible strategies to use within their own organization to assist with the development of self-directed learning among employees.


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There has been growing interest in linking the learning of Science with the literacies of Science and representations. Recent attention has been focused on learning theories that emphasise the socio-cultural and situated aspects of learning, and in particular the notion of learning as participation in a discourse community. This paper will describe a learning sequence planned wilh Year 5/6 teachers to study invertebrates in the schoolground environment, but with an additional focus in which students generated and negotiated representations, and discussed the adequacy of these. The paper will present data from video capture of classroom activities, students' work samples, and pre- and post-unit testing, to explore what a representational focus might entail in teaching science, and the role of representations in learning, reasoning and exploring in science.

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Purpose – This paper seeks to establish and demonstrate the relevance of feminist research methods within built environment research. While no one definition of feminist research exists, many feminist researchers identify characteristics which distinguish it from traditional social science research; it is research that studies women, or that focuses on gender.
Design/methodology/approach – There is a growing body of research into women and the built environment adopting feminist paradigms. This paper explains the dynamic, evolving philosophical basis of feminist research methods drawing comparisons to traditional positivist methodologies and demonstrates that feminist research has characteristics that can be imported into other research paradigms.
Findings – The paper shows that there is much to be learned from an understanding of feminist research for all researchers in the built environment and that by adopting different approaches to research, researchers may find new and original ways of examining complex issues.
Research limitations/implications – The implications are that all researchers in the built environment should consider the benefits of adopting a feminist approach in their research especially where the researcher is seeking to gain a deeper understanding of peoples' experiences.
Originality/value – This paper seeks to raise awareness of the benefits of adopting feminist research methods in a discipline dominated by traditional approaches to research.

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The cost of accessing higher education is expensive causing students to juggle the demands of paid work with study responsibilities. Whilst some work can be beneficial to student leaning this research seeks a more accurate understanding of why students undertake paid experience work to the level that they do. This paper examines the extent of work and study during an undergraduate program in construction at RMIT University Australia. Students responded to a questionnaire on the duration and nature of their work and study times. The results indicate that students who were involved in paid work do in excess of 20 hours per week, whist also enrolled as full-time undergraduates. The results of the study show that students in the early years of the program seem to be more engaged with study and spent slightly less time at work. This is contrasted with students in the final two years of the course spend considerable more time in paid work and less time undertaking study.
The paper concludes by suggesting that the results are partly the result of the unstructured work-experience requirements that occur from about year 3 of the program. Students who were encouraged by the university to undertake paid work-experience appeared to be increasingly disinterested in connecting with the broader university experience.

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This paper describes a process for negotiating aspects of flexible learning through the consideration of flexibility from student, teacher and institutional perspectives. The process aimed to reconcile, in an Australian school of architecture, the competing demands of learner’s increasing flexibility demands, teacher’s attributes and pedagogical objectives and the structural limitations that militate against the delivery, resourcing and maintenance of flexibility. Results indicated that the only categories of flexibility (out of time, content, access/entry requirements, pedagogy and delivery) that were demanded by students were pedagogy (but only in the choice of working in groups) and delivery; whereas teachers were merely willing to offer flexibility in delivery. Thus, what students desired of teaching, and what teachers were able to provide, were multiple mediums of knowledge delivery that allowed students flexibility in when and where they could learn. These findings, it is suggested, have relevance for course redesign throughout the creative/visual arts.

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This paper presents a human daily activity classification approach based on the sensory data collected from a single tri-axial accelerometer worn on waist belt. The classification algorithm was realized to distinguish 6 different activities including standing, jumping, sitting-down, walking, running and falling through three major steps: wavelet transformation, Principle Component Analysis (PCA)-based dimensionality reduction and followed by implementing a radial basis function (RBF) kernel Support Vector Machine (SVM) classifier. Two trials were conducted to evaluate different aspects of the classification scheme. In the first trial, the classifier was trained and evaluated by using a dataset of 420 samples collected from seven subjects by using a k-fold cross-validation method. The parameters σ and c of the RBF kernel were optimized through automatic searching in terms of yielding the highest recognition accuracy and robustness. In the second trial, the generation capability of the classifier was also validated by using the dataset collected from six new subjects. The average classification rates of 95% and 93% are obtained in trials 1 and 2, respectively. The results in trial 2 show the system is also good at classifying activity signals of new subjects. It can be concluded that the collective effects of the usage of single accelerometer sensing, the setting of the accelerometer placement and efficient classifier would make this wearable sensing system more realistic and more comfortable to be implemented for long-term human activity monitoring and classification in ambulatory environment, therefore, more acceptable by users.

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To tackle the problem of increasing numbers of state transition parameters when the number of sensors increases, we present a probabilistic model together with several parsinomious representations for sensor fusion. These include context specific independence (CSI), mixtures of smaller multinomials and softmax function representations to compactly represent the state transitions of a large number of sensors. The model is evaluated on real-world data acquired through ubiquitous sensors in recognizing daily morning activities. The results show that the combination of CSI and mixtures of smaller multinomials achieves comparable performance with much fewer parameters.