共查询到20条相似文献，搜索用时 31 毫秒
1.
论述了DDS,MAG,DA,CORDIC等多种硬件算法及其在FPGA中的实现,介绍了DDS中各数据位宽对性能的影响及选择标准,论述了RAG,DA算法在实现乘法运算中的优劣和CORDIC的原理,并给出了大部分算法在Xilinx FPGA中综合后的结构图. 相似文献
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Eeva‐Leena Onnismaa Marjatta Kalliala 《Early Years: An International Journal of Research and Development》2010,30(3):267-277
This article examines the complex development and contradictory current state of affairs of early childhood education and care (ECEC) in Finland. Rather than presenting a harmonious picture of the Finnish ECEC system, the authors have chosen to look at the problematic way in which national policies concerning ECEC have been interpreted and implemented. The road from legislation and national regulations (e.g. the National Curriculum Guidelines) on ECEC in Finland to implementation has been a convoluted one and the implementations may vary remarkably according to how the documents have been interpreted. Several results of this can be seen as less than favourable. For example, due to attempts to enlarge the scope of Finnish ECEC, its primary task – promoting the well‐being, development and learning of the child – has gradually been obscured. In addition, a number of ‘external’ factors such as rivalry between professional groups have influenced the shaping of the ECEC field more than one would like to admit. A more analytical approach to ECEC is called for in order to avoid new misinterpretations of the national policies and consequent adverse policy effects. 相似文献
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Francisco Alpiste Penalba Teresa Rojas-Rajs Pedro Lorente Francisco Iglesias Joaquín Fernández Josep Monguet 《Interactive Learning Environments》2013,21(5):438-455
The Opera eLearning project developed a solution for opera singing distance lessons at the graduate level, using high bandwidth to deliver a quality audio and video experience that has been evaluated by singing teachers, chorus and orchestra directors, singers and other professional musicians. Prior to finding a technological model that suits the user's requirements, several experiments have been conducted, testing and prototyping different technologies, until arriving at a telepresence, immersive sound model. This paper summarises the findings of this pilot stage, and its interest includes the management of innovation exercises across a multidisciplinary team, based on usability and a user-centred design. Some of the technology tested includes professional audio and video equipment, software for A/V signal capturing and transmission on uncompressed formats, A/D converters, and other auxiliary devices. The resultant model has later been successfully used in a formal case study, delivering 14 remote masterclasses. 相似文献
4.
Martin Guhn 《Journal of Educational Change》2009,10(4):337-363
Past educational reforms were commonly found to be of limited success, due to the fact that schools alone cannot overcome
the developmental challenges that poverty and ethno-cultural segregation impose upon many children. However, there are reports
of some reform programs that have frequently been successful in low-achieving, poverty-ridden, and ethno-culturally segregated
schools. In this paper, two such successful school reform programs—School Development Program; Child Development Project—were examined in order to identify processes linked to their frequent success, with a focus on the implementation and sustainability
of these programs. The analysis was theoretically guided by Bronfenbrenner’s bio-ecological theory of human development. A web of interdependent processes, related to relationship building, autonomy, resistance to change, competence, leadership, team support, and school-family-community partnerships, was identified. These findings are discussed in regard to a conceptual and practical shift in school reform: (a) towards
schools as caring communities that address universal human needs in culturally appropriate ways, with accountability tied
to providing continuity and support to empowered students; and (b) away from schools that universally focus on narrow, externally
imposed, and discriminatory outcome goals. 相似文献
5.
In this work, two parallel implementation strategies for the numerical simulation of wind flow around buildings were developed
based on a four-processor transputer system. The first parallel strategy is based on the functional decomposition of the problem.
It is easily implementable, but the degree of parallelism is low. In the second strategy, both the functional and the domain
parallelisms of the problem were utilized, so the degree of parallelism is highly increased. Numerical examples indicate that
the parallel speed-ups and efficiencies achievable by the second strategy are significantly greater than those of the first
one.
Project (59478034) supported by Natural Science Foundation of China. 相似文献
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Siritunga D Montero-Rojas M Carrero K Toro G Vélez A Carrero-Martínez FA 《CBE life sciences education》2011,10(3):287-297
Today, more minority students are entering undergraduate programs than ever before, but they earn only 6% of all science or engineering PhDs awarded in the United States. Many studies suggest that hands-on research activities enhance students' interest in pursuing a research career. In this paper, we present a model for the implementation of laboratory research in the undergraduate teaching laboratory using a culturally relevant approach to engage students. Laboratory modules were implemented in upper-division genetics and cell biology courses using cassava as the central theme. Students were asked to bring cassava samples from their respective towns, which allowed them to compare their field-collected samples against known lineages from agricultural stations at the end of the implementation. Assessment of content and learning perceptions revealed that our novel approach allowed students to learn while engaged in characterizing Puerto Rican cassava. In two semesters, based on the percentage of students who answered correctly in the premodule assessment for content knowledge, there was an overall improvement of 66% and 55% at the end in the genetics course and 24% and 15% in the cell biology course. Our proposed pedagogical model enhances students' professional competitiveness by providing students with valuable research skills as they work on a problem to which they can relate. 相似文献
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本文根据全国考办"自学考试综合改革试点工作研讨会"和江苏省教育考试院高等教育自学考试综合改革试点实施方案精神,以南京航空航天大学继续教育学院为例,从校企协同为社会企业培养技能型应用人才角度出发,创新高等教育自学考试人才培养模式,探索校企合作发展高等教育自学考试新机制,形成了一套较为完善的教育教学管理体系,走出了独特的以校企协同为办学特色的高等教育自学考试发展之路。 相似文献
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王景惠 《学位与研究生教育》2005,(3):45-48
基于研究生的英语学习需求分析,探讨了在信息技术条件下进行研究生英语教学的新 模式:面向国际学术交流,运用现代信息技术优化外语教学资源,以高质量的外语输入建构外语知 识、培养外语能力。新的教学模式有效地激发了研究生英语学习潜能,拓宽了研究生英语教学改革 之路。 相似文献
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本文深刻地阐述了当前策略训练的目的和必要性。此外，通过介绍国外的一些流行策略，提出了一些建议。 相似文献
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M S Lilly 《Exceptional children》1971,37(10):745-749
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Henry Lieberman 《Instructional Science》1986,14(3-4):277-292
Making a good programming environment for beginning programmers is an enterprise which can exploit the strong connections between machine learning and human learning. Applying what we know about teaching and learning to improve the programming environment can result in a system which allows beginners to more readily acquire programming skills.Surprisingly, a universally accepted principle of good teaching and good learning has not been taken seriously enough in designing programming environments-learning by example. A good teacher presents examples of how to solve problems, and points out what is important about the examples. The student generalizes from the examples to learn principles and techniques. This paper describes a programming environment called Tinker, in which a beginning programmer presents examples to the machine, distinguishing accidental and essential aspects of the examples. The programmer demonstrates how to handle the specific examples, and the machine formulates a procedure for handling the general case. Because people are much better at thinking about concrete examples than they are at thinking about abstractions, and because examples provide immediate feedback, Tinker is a more congenial environment for a beginner than conventional programming systems. 相似文献
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The unintentional islanding of micro-grid may cause negative impacts on distribution loads and distributed generations, so it must be detected within the acceptable duration. In this paper a new islanding detection algorithm is proposed. This algorithm introduces the frequency feedback method by the reactive power compensation to derive the frequency continuous shift. Accordingly, the islanding can be detected by monitoring the frequency within 0.1 s. The simulationresults prove that this algorithm has extremely small non-detection zone, and meanwhile it presents an excellent islanding detection speed as well. 相似文献
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项目学习为学习者提供了真实的学习环境,更有利于学生实践能力和探究精神的培养。采用项目学习需要进行精心设计,包括学习活动设计、学习任务设计、教学评价设计、教学媒体设计等。在网页设计课程教学中尝试引入项目学习,并且采用问卷调查方法研究教学效果,可以看到,项目学习对于掌握网页设计这门课程的知识更为有效,对于培养学生社会实践能力有很好的帮助。 相似文献
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VSC-HVDC的稳态模型仿真研究 总被引：1，自引：0，他引：1
介绍了轻型直流输电(VSC-HVDC)技术的稳态运行特性,针对VSC-HVDC的稳态情况,设计了VSC-HVDC的控制策略,并基于PID控制原理设计了相应的控制器。仿真实验表明,该方法控制效果良好,对于故障情况能有很快的响应且稳定性良好。 相似文献
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Ya‐huei Wang Hung‐Chang Liao 《British journal of educational technology : journal of the Council for Educational Technology》2011,42(1):66-87
In the conventional English as a Second Language (ESL) class‐based learning environment, teachers use a fixed learning sequence and content for all students without considering the diverse needs of each individual. There is a great deal of diversity within and between classes. Hence, if students' learning outcomes are to be maximised, it is important to know how to provide learning content using students' preferences, learning characteristics and knowledge background as a basis. A five‐step algorithm was proposed that was based on the four factors (gender, learning motivation, cognitive style and learning style) as the different learner characteristics. The percentage increase between the pretest and posttest scores was used to determine optimal adaptive learning sequences to accommodate a variety of individual differences. The algorithm included the following five steps—to obtain the learning performance, to distinguish the learning performance of the lowest and highest groups, to use the different learning sequences as a basis for categorisation, to test the four factors between the lowest and highest performance, and to reduce the number of handouts. Finally, an empirical study for validating the adaptive learning sequence was conducted. By analysing the students' characteristics and the optimal learning sequences, an attempt was made to develop an adaptive learning sequence system to facilitate students' learning and to maximise their learning outcome, thus addressing the problem of fixed learning sequences in conventional ESL instruction. 相似文献
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孟琳君 《绵阳师范学院学报》2007,26(11):28-31
提出了OFDM系统中一种新的基于软信息迭代处理的信道估计算法。该算法将面向判决最小二乘估计算法和盲估计算法相结合,在估计器中构造了一种新的置信度量函数,根据解码和软映射重构的反馈信号置信度大小在两种估计算法中自适应选择,这样估计的信道频响可以有效提高软信息迭代接收性能,大大降低信道估计训练开销。仿真结果表明,该文提出的算法能有效跟踪信道时变,限制传统面向判决估计的错误传播,达到好的系统性能。 相似文献