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Since the present algorithms are on the assumption of correct beacon information, when the network is attacked, especially the beacons are captured by opponents, all algorithms will not work. To address this issue, one attack-resistant nodes localization algorithm we call VDV-Hop(Voting DV-Hop) which is on the basis of DV-Hop algorithm and based on the voting mechanism is presented. This algorithm...
The credit rating system for bank customers is based on J2EE technology architecture, is designed from the data sources, customers rating, approval rating and safety management and other aspects. In the paper, we describes the construction of bank customers in the background of credit rating system which is discussed in detail the application of Client/Web server/Application server/Database server...
Aiming the routing's instability problem for mobile ad hoc networks based on directional antenna, a method of using probability density to measure the link availability is presented, a directional link availability calculation model is established, and the calculation method as well as formulas are given. Final simulation results show that the effectiveness of directional links has relativity with...
This paper proposed an improved neighbor finding algorithm based on directional antenna. Through the algorithm, neighbor finding ability of node was greatly improved. And we also proposed a backoff algorithm which was seldom studied in ad hoc network with directional antenna. The algorithm proposes that through changing the backoff windows, the node will reduce the backoff time. So the networks will...
The mobile node's power control is very important because the energy source of mobile ad hoc networks is limited. The paper presents a power control algorithm based on MAC protocol with directional antennas. The algorithm accounts the interferential power of interferential node in the interferential area through calculating the interferential range. Thus it concludes the send power of node. Through...
This study proposed the concepts, architecture, and kernel of a GroupNet system to construct a more flexible ubiquitous learning environment. GroupNet is aiming to support small-group face-to-face learning activities anywhere and anytime without sticking in traditional classroom settings and additional infrastructures. We have also implemented the application programming interface (API) for accessing...
The dynamic nature of topology makes it challengeable to estimate link loss rates in mobile ad hoc network (MANET). Firstly, simulation results based on existing mobility models have the unrealistic movement scenarios which may not correctly reflect true MANET performance. Secondly, it is difficult to identify MANET topology under these models due to phantasmagoric movements. This paper presents the...
Mobile ad hoc network (MANET) loss tomography is a process for inferring internal wireless links loss rates based on end-to-end network measurement. The crucial step in MANET loss tomography is topology identification. Since the simulation results based on existing mobile models may not correctly reflect the true MANET performance, a novel circle-movement mobility model (CMM) and its topology inference...
The link performance (loss rate and delay probability) inference is important for evaluating mobile ad hoc network (MANET). The crucial step is MANET topology identification. Since the majority of existing mobility models (MM) may not correctly reflect the true MANET performance, a novel MM based on circle movement is presented. With help of the model, we identify the MANET topology and its live time...
The internal link performance inference is an increasingly important role in evaluating network. In this paper, we explore the use of end-to-end unicast traffic measurements, which consist of back-to-back packets sent from a sender to pairs of receivers, to estimate the delay probability distribution of mobile ad hoc network (MANET) internal links. Since the majority of existing mobility models for...
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