最速下降和共轭梯度混合算法在波束形成中的应用     

赵翠芹  段艳明  包玉珍 《河池学院学报》2011,31(5):97-100

介绍了一种最速下降法和共轭梯度法的混合算法,并将这种混合算法应用到自适应波束形成中。该方法根据最小均方(LMS)准则推导出代价函数,结合共轭梯度法和最速下降法产生搜索方向,既提高了共轭梯度算法的收敛速度,又解决了最速下降法下降缓慢的问题。计算机仿真表明,混合算法所需迭代次数少于最速下降法,且显著减少计算量,缩短运行时间。  相似文献   

标话的形成     

杨璧菀 《贺州学院学报》2011,27(4):80-82

标话、上坊话和下坊话三种语言应在1000多前就在怀集共存了。原始标话与汉语方言长期交流融合,逐渐发展成为今天各地的标话。这种语言吸收了很多汉语的成分,但少数民族语言的底子没有变。  相似文献   

Teaching,teacher formation,and specialised professional practice     

Jim Hordern 《欧洲师范教育杂志》2015,38(4):431-444

This paper starts by exploring the relevance of Bernstein’s work on vertical and horizontal discourses and the constitution of professional knowledge for conceptualisation of the knowledge needed for teaching practice. Building on arguments for the differentiated nature of knowledge, and drawing on the work of Winch, Young and Muller on expertise, and the sociology of the professions, this paper advances a conception of teaching as a ‘specialised professional practice’ that requires the support of particular socio-epistemic arrangements and conditions embedded in professional communities. Prevalent notions of teaching and teacher education that find favour in some European countries are examined in the light of these arguments, with particular reference to recent reforms in England.  相似文献   

Socio-demographic and practice-oriented factors related to proficiency in problem solving: a lifelong learning perspective     

Richard Desjardins 《International Journal of Lifelong Education》2015,34(4):468-486

This article explores the relative importance of different socio-demographic and practice-oriented factors that are related to proficiency in problem solving in technology-rich environments (PSTREs) and by extension may be related to complex problem solving (CPS). The empirical analysis focuses on the proficiency measurements of PSTRE made available by the Programme for the International Assessment of Adult Competencies, which is relevant for gaining insight on some of the factors related to CPS. The purpose was to examine the relationship between the broad information processing experience that individuals gather in different contexts over the lifespan, and the chances to develop problem-solving skills that adults receive in different socio-demographic profiles. Results reveal that socio-demographic factors such as age, education and immigration status as well as practice-oriented factors such as ICT use and reading practice at and outside work are strongly related to proficiency.  相似文献   

《红楼梦》中的概念隐喻研究     

张光华 《海外英语》2015,(6)

概念隐喻是以一个认知域的经验来说明或理解另一个认知域的经验,用源域的某些特点来映射目标域,从而使目标域的理解变得简单。《红楼梦》语言描写中的一大特色就是使用隐喻。文章从概念隐喻的三个维度：结构隐喻、方位隐喻和本体隐喻来分析和阐释《红楼梦》中的概念隐喻,以期发现这些概念隐喻的具体类型,解释它们发生的内在过程。  相似文献   

《红楼梦》中的方位隐喻现象分析     

郑娜新 《海外英语》2015,(5)

方位隐喻是概念隐喻的一种,它借用空间位置来表达抽象概念。该文基于《红楼梦》前十回的语料分析了汉语中“上、下”,“高、低”,“深、浅”,“里、外”的方位隐喻现象,发现这些方位隐喻可以表达数量、地位、时间、情感、状态等抽象概念,它们既是人类认知的普遍现象,有些又极具汉语文化特色。  相似文献   

Expert group formation using facility location analysis     

Mahmood Neshati  Hamid Beigy  Djoerd Hiemstra 《Information processing & management》2014

In this paper, we propose an optimization framework to retrieve an optimal group of experts to perform a multi-aspect task. While a diverse set of skills are needed to perform a multi-aspect task, the group of assigned experts should be able to collectively cover all these required skills. We consider three types of multi-aspect expert group formation problems and propose a unified framework to solve these problems accurately and efficiently. The first problem is concerned with finding the top k experts for a given task, while the required skills of the task are implicitly described. In the second problem, the required skills of the tasks are explicitly described using some keywords but each expert has a limited capacity to perform these tasks and therefore should be assigned to a limited number of them. Finally, the third problem is the combination of the first and the second problems. Our proposed optimization framework is based on the Facility Location Analysis which is a well known branch of the Operation Research. In our experiments, we compare the accuracy and efficiency of the proposed framework with the state-of-the-art approaches for the group formation problems. The experiment results show the effectiveness of our proposed methods in comparison with state-of-the-art approaches.  相似文献   

基于专利分析概念模型的中国机器人技术发展预测     

王健  张韵君  Zhang Yunjun 《情报杂志》2014,(11)

基于专利分析的概念模型,从技术发展方向、技术发展水平和技术发展潜力三个方面对中国机器人技术发展进行预测,以验证模型的应用性。预测结果表明：中国机器人整体技术处于成长期,但主要的子技术还存在明显差异：其中机械手子技术已位于成长期的中后期阶段,转向机构子技术则位于成长期的前期阶段,非电变量的控制或调节系统技术以及一般的控制或调节系统则刚进入成长期。因此,企业、高校以及科研院所应积极抓住机器人技术发展的大好时机,开展联合攻关,实现机器人关键技术的重大突破,促进产业转型与升级,提升先进制造业的产业技术竞争力。  相似文献   

云南特有少数民族武术的形成及其发展战略建构简     

汪雄  冯艳琼  李俊恒 《吉林体育学院学报》2014,(1):95-97

从社会学、文化学、人类学等角度,剖析云南特有少数民族武术的形成与发展过程,并进一步探讨其未来发展路径。研究结果认为：云南特有少数民族武术运动的发展是其各民族在长期的生产生活习俗以及历史文化的积淀过程中逐渐形成的,与其生产、生活、战争以及宗教祭祀活动等有着密切的关联;树立科学合理的认知方式、建立合理的价值取向、实施开发与保护并举将成为发展云南特有少数民族武术的必然选择。  相似文献   

“352”足球比赛阵型训练的探讨     

罗代 《湖北体育科技》2014,(4):319-320

采用文献综述法对"352"阵型的特点以及训练方法进行研究,认为阵型练习时教练员应注意与队员沟通、扬长避短,培养运动员的团队意识。  相似文献