中国教育资源的配置长期存在着地区差异化问题,由于东西部经济发展的不平衡,东西部教育资源的不匹配问题更为严重,这种情况对基础教育来说更加突出.而就高等教育而言,目前许多高等院校校区分散,教育资源也同样存在失衡问题.例如,山东大学在济南有6个校区,青岛和威海各有1个校区,使得教师为了上课不得不在各校区之间辗转,既耽误了宝贵的时间和精力,又浪费了有限的公共资源.

Free riding in peer-to-peer(P2P) systems means a peer utilizing other peers' network resources without contribution,which will cause severe degradation of the service quality in P2P streaming systems.A two-class fluid model was introduced to model and analyze the free riding problem.With this model,two scenarios including without seeders and with seeders were considered,and a quantitative analysis of the effect of free riding on the performance of P2P streaming systems particularly in the steady state was put forth.The result showed that both honest peers and free riders could achieve a much lower download time in the scenario with seeders than that without seeders,and thus it was essential to introduce the mechanisms to incentivize the seeders to stay in the system.The free riders could benefit greatly from the streaming server and the seeders,and thus it is important to introduce differentiated service for the server and seeders in P2P streaming systems.

随着CNGI-CERNET2纯IPv6网络的成功建设与部署,基于IPv6的下一代互联网络在众多高校的校园网中已经得到了长足的发展,并逐渐开始普及.但是IPv6校园网的发展受到了网络管理问题的制约,这是影响IPv6网络进行大规模商用的关键因素之一.本文主要概述IPv6网络管理的发展现状,并分析其所面临的主要问题和挑战,最后简要介绍我们在IPv6网络管理方面所进行的一些试验和探索.

学生网管的加入,有效地提升了山东大学的网络管理与维护效果. 山东大学校园网经过十几年的建设已经发展成为覆盖济南和威海两地7个校园、5个附属医院的大规模网络,拥有计算机网络信息点达8万个,入网计算机总数超过4万台.

n this article, an application of a new data processing tool-wavelet transform is introduced. It can be used for science study in physiology and the other subjects. Here we offer a method of extracting respiration frequency and heart beat ratefrom blood pressure waveform curve with wavelet transform and FFT.

目的:研制配置生理学模拟实验资料库生成系统,完善生理学实验计算机辅助教学系统.方法:利用现有仪器设备和相关软件采集各种实验资料,应用VB5.0和BC语言自行编写生成系统软件.结果:把采集的资料应用于该系统,可以生成模拟实验资料库,观察实验操作过程、结果曲线等资料,并可对数据进行各种处理.结论:通过应用实验,证明了系统的有效性与实用性.由于生成系统提供了小波变换等数据处理功能模块,亦可用于生理学科研实验.

Effects of electrical and chemical stimulation of the dorsal and ventral areas of the nucleus raphe dorsalis (dNRD and vNRD) on genioglossus and diaphragm activities were observed in 48 urethane-anaesthetized and vagotomized rabbits. (1) Long train electrical stimulation at the dNRD facilitated genioglossus and diaphragm activities. (2) Long train electrical stimulation delivered to the vNRD excited genioglossus activity but inhibited diaphragm activity. (3) Effects of microinjection of glutamate at the dNRD and vNRD were similar to the effects of electrical stimulation. The above results suggest that excitation of nucleus raphe dorsalis (NRD) increases genioglossus activity and reduces upper airway resistance. The dNRD and vNRD play different roles in modulating diaphragm activity.