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论文作者:www.51lunwen.org论文属性:本科毕业论文 Thesis登出时间:2014-12-24编辑:Cinderella点击率:11635
论文字数:5763论文编号:org201412192102465262语种:英语 English地区:澳大利亚价格:免费论文
关键词:human migrationmobility concept人类迁移流动性
摘要:本文介绍了人类流动性,尤其突出了人类流动数据对互联网络研究工作的重要意义。
However, a major disadvantage of the RPGM model is that node movement in a group is limited to a relatively low velocity motion (Battiti, 2004). Moreover, so many open parameters are left out by the model such that a range of choices has to be made in specifying a complete simulation setup. Additionally, physical locations of the nodes are instantaneous. For this reason, deriving the movement characteristics of the nodes in the group becomes difficult.
Applications
The RPGM model finds various applications in communication especially for its applicability in other models as well. It can be used to generate topologies in ad hoc networks that have node mobility based on group motion. It supposes the concept of an omniscient observer, a characteristic that enables the maintenance of complete information on the mobility of groups as well as that of member nodes. RPGM represents mobile nodes using their physical coordinates. Group mobility can be used in military communication particularly in the battlefield. For instance, individual soldiers may move collectively in a group. In another illustration, in cases of disaster relief, rescue crews operate in groups while working cooperatively (Jayakumar & Ganapathi, 2008).
In the movement of soldiers, the movement of the group leader may be denoted by time t and a velocity vector v. These parameters not only define the movement of the leader but also determine the general movement of the group as a whole. Every soldier in the group deviates from the velocity vector of the group leader by a certain degree. This vector may be chosen in a random manner depending on the predefined paths. If the predefined paths are selected appropriately, the RPGM model may be used to emulate a wide range of human mobility behaviors. These are useful in the cases mentioned earlier, that is, battlefield communication and disaster relief scenarios.
Other group mobility models include the column mobility model in which a number of nodes form a line and move forward in a uniform direction. The Nomadic Community Mobility model involves a set of nodes moving collectively from one location to the other. Finally, pursue mobility model entails a set of entities that follow a given target in a simulation area. Many other mobility models exist in various theoretical frameworks as well as simulation environments, analysis settings and models.
CONCLUSIONS
A larger number of mobility models than discussed in this study are used in the simulation of wireless networks and in other areas of communication with regards to human mobility. This study has covered several classes of mobility models which have been described in details including their areas of application. In fact, the importance of choosing the appropriate model for a specific research 本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。