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学术界近期提出了基于扁平结构的分布式哈希表(DHT)名系统,用以克服现有名系统域名解析系统(DNS)存在的缺陷,如不支持数据的移动、复制等,但由于其解析时延较大,不适于实际应用。为此,综合DNS名系统及DHT名系统的优点,设计了两种新的系统:第一种系统采用One-hop DHT形式,三层环结构实现,适于小环境应用;第二种采用混合结构DHT形式,分域实现,适于全球性应用。经理论分析证明这两套系统在实际应用中是可行的。 相似文献
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Internet of Things(IoT) refers to an infrastructure which enables the forms of communication and collaboration between people and things,and between things themselves.In order to improve its performance,we present a tradeoff between bandwidth and energy consumption in the IoT in this paper.A service providing model is built to find the relationship between bandwidth and energy consumption using a cooperative differential game model.The game solution is gotten in the condition of grand coalition,feedback Nash equilibrium and intermediate coalitions and an allocation policy is obtain by Shapley theory.The results are shown as follows.Firstly,the performance of IoT decreases with the increasing of bandwidth cost or with the decreasing of energy cost;secondly,all the nodes in the IoT composing a grand coalition can save bandwidth and energy consumption;thirdly,when the factors of bandwidth cost and energy cost are equal,the obtained number of provided services is an optimised value which is the trade-off between energy and bandwidth consumption. 相似文献
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The architecture of cislunar multi-hop communication networks, which focuses on the re-quirements of lunar full-coverage and continuous cislunar communications, is presented on the basis of Geosynchronous Orbit (GEO) satellite network relays. According to the geographical distribution of the forthcoming Chinese Deep Space Measuring and Controlling Network (DSMCN ), two networking schemes are proposed and two elevation angle opti-mization models are established for locating GEO relay satellites. To analyze the dynamic connectivi-ty, a dynamic network model is constructed with re-spect to the time-varying characteristics of cislunar trunk links. The advantages of the two proposed schemes, in terms of the Connectivity Rate (CR), In-terruption Frequency (IF), and Average Length of Connecting Duration (ALCD), are corroborated by several simulations. In the case of the lunar polar orbit constellation case, the gains in the perform-ance of scheme I are observed to be 134.55% , 117. 03% , and 217. 47% compared with DSMCN for three evaluation indicators, and the gains in the per-formance of scheme II are observed to be 238.22% , 240.40% , and 572.71% . The results validate that the connectivity of GEO satellites outperforms that of earth facilities significantly and schemes based on GEO satellite relays are promising options for cislu-nar multi-hop communication networking. 相似文献
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Nowadays, an increasing number of web applications require identification registration. However, the behavior of website registration has not ever been thoroughly studied. We use the database provided by the Chinese Software Develop Net (CSDN) to provide a complete perspective on this research point. We concentrate on the following three aspects: complexity, correlation, and preference. From these analyses, we draw the following conclu-sions: firstly, a considerable number of users have not realized the importance of identification and are using very simple identifications that can be attacked very easily. Secondly, there is a strong complexity correlation among the three parts of identification. Thirdly, the top three passwords that users like are 123456789, 12345678 and 11111111, and the top three email providers that they prefer are NETEASE, qq and sina. Further, we provide some suggestions to improve the quality of user passwords. 相似文献
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