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The task of indoor localization has been carried out with different approaches, which utilize data integrated from distinct sensors belonging to mobile devices. Floor determination is one of the crucial challenges encountered during indoor localization. The solutions to floor determination are mainly based on the techniques of Wireless Fingerprint and RFID (Radio Frequency Identification) sensors...
The spacial distribution of nodes in the Opportunistic networks is uneven in the real scenarios. There are some landmarks with high node density distributed in the network area. Based on the uneven distribution character of nodes in the Opportunistic Networks, a landmark aware content searching scheme (LACS) is proposed. The scheme proposed here is composed of two sub-schemes, latent spray scheme...
We study the Minimal Delay Path (MDP) of message delivery and its evolving properties in social opportunistic networks where the connectivity is intermittent and evolving over time. Through in-depth analysis of the public released trace dataset from CRAWDAD community, our results show that the network connectivity is highly depended on some rare nodal contacts that occurred only few times rather than...
Opportunistic Network is a special kind of mobile Ad Hoc network in which communication nodes are sparsely distributed in the network area and the communicating opportunities between the nodes are created by the moving and encounter of the nodes. Achieving reliable data transmission in Opportunistic Networks is a great challenging task because there is no contemporaneous path between source and destination...
Vehicular ad-hoc networks (VANETs) are promising for more and more intelligent transportation applications, where information is disseminated over a group of vehicles. VANETs are characterized for its unstable framework, in which the isolated vehicles communicate with others only when the unexpected meetings occur. As a result, some available data dissemination schemes do not work well in VANETs....
The modeling of the natural WSN (wireless sensor networks) is very difficult because of its complexity. Therefore, the normal way is to evaluate various broadcasting protocols for WSN in simulation. The actual structure of WSN really can be modeled via simplifying some condition to validate the simulation results. In this paper, a modeling method for data broadcasting in WSN is advanced by calculating...
In this paper, a light mobile GIS framework is proposed which is based on J2ME and mobile scalable vector graphics (SVG). Firstly, in this framework, it gives a general mobile GIS framework, the specification of mobile SVG, the specification of mobile XML, and the rules for spatial data organizing. Secondly, all kinds of GIS code rules are defined, how to manage map layer in SVG is defined, all kinds...
The mobile ad hoc networks are characterized by frequent disconnections and partitioning. In this paper, we focus on data dissemination service. We propose a publish/subscribe protocol for MANETs, which is called SAPS algorithm. This Self-Adaptive Publish/Subscribe (SAPS for short) Algorithm makes use of the information about the users' context and social behaviours, to decide how to obtain useful...
With the development of GIS, all kinds of GIS systems are applied to different domains, such as location, oil exploration, traffic and so on. The traditional GIS only provides basic GIS functions, whereas, in practice, the users wish to integrate their applications into GIS. If traditional GIS is employed for integrating applications, it must employ the APIs to develop application-based-on-GIS. In...
Intermittent connected mobile sensor networks (ICMSN) have emerged in recent studies, e.g. underwater sensor networks, wildlife tracking and human-oriented flu virus monitoring. In these networks, there are no end to end connections from sensor nodes to sink nodes due to low node density and node mobility. Therefore, conventional routing protocols in WSN are not practical for ICMSN since packets will...
Since evolutionary algorithms (EA) were proposed as an optimization method, they have been used to solve problems in many fields. However, accuracy, convergence and stability are always topics in EA research. This paper shows our efforts in such direction. We employ a novel approach, namely the cloud model, to model evolution process and then present an efficient EA, i.e. the cloud model based evolutionary...
Optimistic replication which does not lock resources and can tolerate disconnections appears to be the natural choice for mobile computing environment. The replication approach allows updates to be performed independently at any replica, so the fundamental problem in this scheme is that data at any replica has the probability of invalidation. To resolve this problem, this paper presents a new dynamic...
The P2P streaming system must have the adaptation ability to the heterogeneity of the peer nodes and networks. An adaptive scheme on video streaming over multi-hop path in P2P networks is proposed. The streaming server probes the network parameters in the multi-hop path periodically, and adjusts the output bit- rate and the encoding structure according to the probing result. The intermediate peer...
Providing high rate streaming service over cellular data networks is a challenging work. In this paper, a mobile streaming broadcast system, called P2P-leveraged mobile live streaming system (P2PMLS), is proposed. In P2PMLS, the multiple network interfaces of mobile hosts are used. The mobile hosts form a peer-to-peer overlay networks through WiFi or Bluetooth. A part of the peers, called seed peers,...
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