加强信息网络环境下的图书馆建设     

喻绍贤 《哈尔滨学院学报》2002,23(10):135-136

信息网络的迅速发展，对图书馆提出了严峻挑战的同时也带来机遇。图书馆要面对时代变化，不断进行自身建设，才能适应社会发展需要。  相似文献   

EBF网络特征映射和恢复及其在鲁棒话者识别中的应用     

李昕  郑宇  江芳泽 《上海大学学报(英文版)》2002,6(4)

The performance of speaker verification systems is often compromised under real-world environments. For example, variations in handset characteristics could cause severe performance degradation. This paper presents a novel method to overcome this problem by using a non-linear handset mapper. Under this method, a mapper is constructed by training an elliptical basis function network using distorted speech features as inputs and the corresponding clean features as the desired outputs. During feature recuperation, clean features are recovered by feeding the distorted features to the feature mapper. The recovered features are then presented to a speaker model as if they were derived from clean speech. Experimental evaluations based on 258 speakers of the TIMIT and NTIMIT corpuses suggest that the feature mappers improve the verification performance remarkably.  相似文献   

Modeling water and carbon fluxes above summer maize field in North China Plain with back-propagation neural networks     

Qin Z  Su GL  Yu Q  Hu BM  Li J 《Journal of Zhejiang University. Science. B》2005,6(5):418-426

INTRODUCTION Dynamics of carbon and water vapor fluxesexchange between the atmosphere and the ecosystembiosphere, depend on complex and non-liner interplayamong physiological, ecological, biochemical andedaphic factors and meteorological conditions (Jarvis,1995; Leuning et al., 1995). There are many studiesquantifying the fluxes across different time and spacescales as well as assessing the environment con-straints on them by some kinds of biophysical orempirical models whose resul…  相似文献   

移动自组网AODV多路径路由研究     

范业仙 《宁德师专学报(自然科学版)》2007,19(2):141-144

AODV协议是唯一通过IETF批准成为RFC文档的移动自组网按需控制路由协议．分析AODV路由协议工作过程及优缺点，并介绍了几种典型的基于AODV的多路径路由改进协议，最后对这些多路径协议进行优缺点分析及性能比较。  相似文献   

Hybrid ants-like search algorithms for P2P media streaming distribution in ad hoc networks     

ZUO Dong-hong DU Xu YANG Zong-kai 《浙江大学学报(A卷英文版)》2007,8(8):1191-1198

Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks.  相似文献   

区间时变细胞神经网络周期解的鲁棒指数稳定性     

陈安平  曹进德  黄立宏 《湘南学院学报》2004,25(2):5-11

本文研究一类区间时变扰动神经网络系统周期解的鲁棒指数稳定性.获得了一系列关于鲁棒指数稳定性的判据.  相似文献   

A Technique for Automatically Scoring Open-Ended Concept Maps     

Ellen M. Taricani  Roy B. Clariana 《Educational technology research and development : ETR & D》2006,54(1):65-82

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试论高等院校图书资料资源的网上共享     

李端 《河南广播电视大学学报》2001,(4):9-10,15

随着计算机网络的广泛应用，高校师生获取信息、组织信息、使用信息方法和观念的进一步改变，传统的以印刷介质为主要媒体的图书资料系统，已远远不能适应时代的发展，建立数字化、网络化的新型图书资料系统势在必行。本文从实现共享的必要性、可能性，以及文献数据库和网站的建立、维护、更新等方面做了简要的论述，为高校图书资料系统之间实现资源的网上共享提出了方法和途径。  相似文献   

Marcinkiewicz积分交换子在非齐型Herz空间上的有界性     

李华  姚维柱 《洛阳师范学院学报》2011,30(2):8-11

本文主要考虑如下Marcinkiewicz积分交换子在非齐型Herz空间上的有界性Mb(f)(x)=(∫∞0∫x-y≤tK(x,y)b(x)-b(y)f(y)dμ(y)2dt3t)21.  相似文献   

基于无线数传模块的时钟信息显示系统设计     

刘焕茹 《石家庄职业技术学院学报》2011,23(6):22-26

针对大型公共场合需放置多台同步时钟的问题,提出了基于无线数传模块和GPS的时钟信息显示系统设计方案．它利用GPS实现准确授时、无线数传模块实现数据传输、时钟芯片实现时钟信息的存储和更新、8英寸数码管实现时间显示．该时钟信息显示系统的时间同步于GPS授时,走时准确,安装方便．  相似文献