一、前言 1923年,桑志华(E.Licent)和德日进(D.Teilhard de Chardin)在宁夏回族自治区宁武县水洞沟附近约1公里的范围内发现了4处旧石器地点,这是中国发现的最早的旧石器地点群。此后直到七十年代,主要在北方如山西、陕西等省又陆续发...一、前言 1923年,桑志华(E.Licent)和德日进(D.Teilhard de Chardin)在宁夏回族自治区宁武县水洞沟附近约1公里的范围内发现了4处旧石器地点,这是中国发现的最早的旧石器地点群。此后直到七十年代,主要在北方如山西、陕西等省又陆续发现了丁村旧石器地点群、蓝田旧石器地点群和大荔旧石器地点群等。考古学家根据它们各自的文化特征,分别称之为“河套文化”(以后又改称“水洞沟文化”和“萨拉乌苏文化”)、“展开更多
In this paper, a distributed control strategy is proposed to make a complex dynamical network achieve cluster synchronization, which means that nodes in the same group achieve the same synchronization state, while nod...In this paper, a distributed control strategy is proposed to make a complex dynamical network achieve cluster synchronization, which means that nodes in the same group achieve the same synchronization state, while nodes in different groups achieve different synchronization states. The local and global stability of the cluster synchronization state are analyzed. Moreover, simulation results verify the effectiveness of the new approach.展开更多
Many sensor network applications require location awareness,but it is often too expensive to equip a global positioning system(GPS) receiver for each network node.Hence,localization schemes for sensor networks typical...Many sensor network applications require location awareness,but it is often too expensive to equip a global positioning system(GPS) receiver for each network node.Hence,localization schemes for sensor networks typically use a small number of seed nodes that know their locations and protocols whereby other nodes estimate their locations from the messages they receive.For the inherent shortcomings of general particle filter(the sequential Monte Carlo method) this paper introduces particle swarm optimization and weighted centroid algorithm to optimize it.Based on improvement a distributed localization algorithm named WC-IPF(weighted centroid algorithm improved particle filter) has been proposed for localization.In this localization scheme the initial estimate position can be acquired by weighted centroid algorithm.Then the accurate position can be gotten via improved particle filter recursively.The extend simulation results show that the proposed algorithm is efficient for most condition.展开更多
文摘一、前言 1923年,桑志华(E.Licent)和德日进(D.Teilhard de Chardin)在宁夏回族自治区宁武县水洞沟附近约1公里的范围内发现了4处旧石器地点,这是中国发现的最早的旧石器地点群。此后直到七十年代,主要在北方如山西、陕西等省又陆续发现了丁村旧石器地点群、蓝田旧石器地点群和大荔旧石器地点群等。考古学家根据它们各自的文化特征,分别称之为“河套文化”(以后又改称“水洞沟文化”和“萨拉乌苏文化”)、“
基金supported by the Natural Science Foundation of Hohai University under Grant No.2008429211
文摘In this paper, a distributed control strategy is proposed to make a complex dynamical network achieve cluster synchronization, which means that nodes in the same group achieve the same synchronization state, while nodes in different groups achieve different synchronization states. The local and global stability of the cluster synchronization state are analyzed. Moreover, simulation results verify the effectiveness of the new approach.
文摘Many sensor network applications require location awareness,but it is often too expensive to equip a global positioning system(GPS) receiver for each network node.Hence,localization schemes for sensor networks typically use a small number of seed nodes that know their locations and protocols whereby other nodes estimate their locations from the messages they receive.For the inherent shortcomings of general particle filter(the sequential Monte Carlo method) this paper introduces particle swarm optimization and weighted centroid algorithm to optimize it.Based on improvement a distributed localization algorithm named WC-IPF(weighted centroid algorithm improved particle filter) has been proposed for localization.In this localization scheme the initial estimate position can be acquired by weighted centroid algorithm.Then the accurate position can be gotten via improved particle filter recursively.The extend simulation results show that the proposed algorithm is efficient for most condition.
