基于神经网络的转换GPS高程的新方法     

胡伍生  沙月进 《东南大学学报》2003,19(1):53-57

GPS高程是相对于WGS-84椭球体的大地高,因此,在工程应用中,GPS高程需要转换为正常高.转换GPS高程通常采用二次曲面拟合法(CFM)和神经网络方法(NNM),但这2种方法各有优缺点.在研究了这2种方法之后,提出了一种转换GPS高程的新方法,该方法综合了上述2种方法的优点,故取名为“CF&NNM”方法.介绍了CF&NNM方法的思路和计算过程.通过一个工程实例,列出了上述3种方法的数据处理结果,新方法效果最好.对CF&NNM方法进行了理论分析.  相似文献   

地方政府跨区域合作制度实施的障碍及出路   总被引：1，自引：0，他引：1  

封慧敏 《常熟理工学院学报》2008,22(7):46-50

区域一体化已经成为我国地方政府发展的现实选择,区域合作制度是区域公共利益实现的有效保障。但是,地方政府跨区域合作制度实施中存在诸多障碍,主要表现在制度实施异化和制度监督两方面;新制度经济学中的相关理论为地方政府区域合作制度实施提供了理论分析基础。要减少区域合作制度实施的障碍,需要从地方政府思想观念、组织层面、制度层面出发寻求解决路径。  相似文献   

唐代"山水诗"的自然情结     

刘伟民 《九江职业技术学院学报》2002,(3):64-65,61

唐代山水诗是唐人崇尚自然的一种文化现象。唐代山水诗中表现出来的人与自然的关系，是唐人接受自然、崇尚自然，并以自然观照人生追求的独特的审美情怀。  相似文献   

Congestion control for ATM multiplexers using neural networks:multiple sources/single buffer scenario     

杜树新  袁石勇 《Journal of Zhejiang University. Science. B》2004,(9)

A new neural network based method for solving the problem of congestion control arising at the user network interface (UNI) of ATM networks is proposed in this paper. Unlike the previous methods where the coding rate for all traffic sources as controller output signals is tuned in a body, the proposed method adjusts the coding rate for only a part of the traffic sources while the remainder sources send the cells in the previous coding rate in case of occurrence of congestion. The controller output signals include the source coding rate and the percentage of the sources that send cells at the corresponding coding rate. The control methods not only minimize the cell loss rate but also guarantee the quality of information (such as voice sources) fed into the multiplexer buffer. Simulations with 150 ADPCM voice sources fed into the multiplexer buffer showed that the proposed methods have advantage over the previous methods in the aspect of the performance indices such as cell loss rate (CLR) and voice quali  相似文献   

The networked instructor: The quality of networks in different stages of professional development     

《Teaching and Teacher Education》2016

This article focuses on the quality of instructional networks in different stages of professional development. Drawing theoretically from social capital theory and literature on teacher interaction, we conducted in-depth interviews with 30 instructors at the university level. Using qualitative social network analysis to capture and analyze networks, we found that the quality of instructors’ interactions varied across developmental stages (novice, experienced non-expert, and expert instructors), both in terms of interdependence and opportunities for value creation. These findings offer valuable leverage for shaping educators’ everyday professional development and increasing teaching capacity through quality interaction.  相似文献   

中师情结折射的小学教师教育的中国经验     

徐建星 《科教导刊》2020,(1):54-55

改革开放以来中师为我国小学教育培养了大批优秀教师,积累了小学教师培养的丰富经验。当下随着中师退出教师教育的舞台及教师教育存在的问题,社会上形成了深厚的中师情结,其中蕴含着择优录取形成了小学教师的专业自豪感、提前录取促成了小学教师的职业动机、就业待遇提供了小学教师的专业发展动力、综合化课程培育了小学教师的专业素养等小学教师培育的中国经验。  相似文献   

复杂性思维与构建和谐广西     

罗曼予 《南宁职业技术学院学报》2006,11(2):108-111

复杂性思维是认识复杂事物的思维方式,是科学思维的时代特征。作为跨学科的方法论,复杂性思维同样也适用于社会科学、人文科学。社会系统是典型复杂系统,党的十六大提出“构建社会主义和谐社会”,就是要使中国社会这个复杂的大系统保持和谐发展的态势。广西地处中国南疆,无论是地理条件、经济状况、文化构成都具有一定的代表性,用复杂性思维指导和谐广西的建设,追求系统整体优化,达成广西政治、经济和文化的全面和谐,对构建社会主义和谐社会具有重要的意义。  相似文献   

关于旗流形的一个注记     

陈纪阳 《闽江学院学报》2006,27(5):1-7

从几类与群锥有紧密关联的群矩阵入手,构造了几类齐性复能析流形．这些流形包含了旗流形．  相似文献   

Nonlinear modelling of a SOFC stack by improved neural networks identification     

WU Xiao-juan ZHU Xin-jian CAO Guang-yi TU Heng-yong 《浙江大学学报(A卷英文版)》2007,8(9):1505-1509

The solid oxide fuel cell (SOFC) is a nonlinear system that is hard to model by conventional methods. So far,most existing models are based on conversion laws,which are too complicated to be applied to design a control system. To facilitate a valid control strategy design,this paper tries to avoid the internal complexities and presents a modelling study of SOFC per-formance by using a radial basis function (RBF) neural network based on a genetic algorithm (GA). During the process of mod-elling,the GA aims to optimize the parameters of RBF neural networks and the optimum values are regarded as the initial values of the RBF neural network parameters. The validity and accuracy of modelling are tested by simulations,whose results reveal that it is feasible to establish the model of SOFC stack by using RBF neural networks identification based on the GA. Furthermore,it is possible to design an online controller of a SOFC stack based on this GA-RBF neural network identification model.  相似文献   

有序集与有序环     

周亚兰 《喀什师范学院学报》2006,27(6):6-7

给出了有序集与有序环的概念,讨论了他们的关系及性质；同时给出了几种有序集,并证明了复数集是有序集而不是有序环．实数集是有序环.  相似文献