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栏目是编辑人员根据办刊宗旨和编辑方针,再结合来稿特点和读者需要而对期刊主题进行分类、编排所形成的类目,是作者来稿、读者需要和编辑意图三者综合的结果.
栏目对于一本杂志而言,从形象上讲是窗口,从立意上讲是旗帜,从结构上讲是框架.栏目设置的好坏不仅直接关系到杂志的影响力和生命力,而且关系到杂志的质量和效益.可以说,栏目设置的特点与特色,决定一本杂志的品位与品质. 相似文献
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A network model is proposed to support service differentiation for mobile Ad Hoc networks by combining a fully distributed admission control approach and the DIFS based differentiation mechanism of IEEE802.11. It can provide different kinds of QoS (Quality of Service) for various applications. Admission controllers determine a committed bandwidth based on the reserved bandwidth of flows and the source utilization of networks. Packets are marked when entering into networks by markers according to the committed rate. By the mark in the packet header, intermediate nodes handle the received packets in different manners to provide applications with the QoS corresponding to the pre-negotiated profile. Extensive simulation experiments showed that the proposed mechanism can provide QoS guarantee to assured service traffic and increase the channel utilization of networks. 相似文献
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栏目是编辑人员根据办刊宗旨和编辑方针．再结合来稿特点和读者需要而设定的．是读者需要、编辑意图与作者来稿三方面因素综合作用的结果。栏目设置的好坏。直接关系到杂志的影响力和生命力。栏目设置的特点与特色,决定一本杂志的品位与品质。 相似文献
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36年前,作为一名新兵,他创造了入伍3个月入党、4个月荣立二等功、9个月当班长的“传奇”。两年前．已经转业15年的他成为山东省新闻出版业的掌舵人．带领团队年创总产值900多亿元,掀开了出版强省的新篇章…… 相似文献
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A network model is proposed to support service differentiation for mobile Ad Hoc networks by combining a fully distributed admission control approach and the DIFS based differentiation mechanism of IEEE802.11. It can provide different kinds of QoS (Quality of Service) for various applications. Admission controllers determine a committed bandwidth based on the reserved bandwidth of flows and the source utilization of networks. Packets are marked when entering into networks by markers according to the committed rate. By the mark in the packet header, intermediate nodes handle the Received packets in different manners to provide applications with the QoS corresponding to the pre-negotiated profile.Extensive simulation experiments showed that the proposed mechanism can provide QoS guarantee to assured service traffic and increase the channel utilization of networks. 相似文献
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INTRODUCTION In current Internet, most of traffic is generatedby traditional data transfer applications such asHTTP (hyper text transmission protocol), FTP (filetransmission protocol), or SMTP (small mailtransfer protocol). Usually, these elastic applica-tions are not sensitive to the delivery time of indi-vidual packet, but rather to the total transfer time ofthe data. They often use TCP, which provides re-liable end-to-end control over the “best-effort”service of IP. Beca… 相似文献
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End-to-end TCP(transmission control protocol)congestion control can cause unfairness among multiple TCP connections with different RTT(Round Trip Time). The throughput of TCP connection is inversely proportional to its RTT.To resolve this problem,researchers have proposed many methods. The existing proposals for RTT-aware conditioner work well when congestion level is low. However,they over-protect long RTT flows and starve short RTT flows when congestion level is high. Due to this reason,an improved method based on adaptive thought is proposed. According to the congestion level of networks,the mechanism can adaptively adjust the degree of the protection to long RTT flows. Extensive simulation experiments showed that the proposed mechanism can guarantee the bandwidth fairness of TCP flows effectively and outperforms the existing methods. 相似文献
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