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This research conducts a systematic study of human-initiated cascading failures in critical inter-dependent societal infrastructures. The focus is on three closely coupled systems: (i) cellular and mesh networks, (ii) transportation networks and (iii) social phone call networks. We analyze cascades that occur in inter-dependent infrastructures due to behavioral adaptations in response to a crisis...
We provide a simple and accurate analytical model for multi-cell IEEE 802.11 WLANs. Our model applies if the cell radius, R, is much smaller than the carrier sensing range, Rcs. We argue that, the condition Rcs >> R is likely to hold in a dense deployment of access points (APs). We develop a scalable cell level model for such WLANs with saturated nodes as well as for TCP-controlled long file...
A combined base station association and power control problem is studied for the uplink of multichannel multicell cellular networks, in which each channel is used by exactly one cell (i.e., base station). A distributed association and power update algorithm is proposed and shown to converge to a Nash equilibrium of a noncooperative game. We consider network models with discrete mobiles (yielding an...
This paper describes the implementation of a wireless sensor network for the temperature monitoring of shellfish catches over the internet. Temperature loggers in shellfish boxes transmit data through radio frequency to a base station. The information is transferred to a server via the GSM network, where it is processed and uploaded to a database. The web-based interface allows configuration of the...
This century is experiencing an unprecedented growth in the number of mobile wireless users, applications, and wireless network access technologies. The future technology will provide communications and computing, where the users have network access, anytime, anywhere, and these applications shall be location-sensitive. To realize this vision, the network connectivity of private networks is required...
We consider a dense, ad hoc wireless network confined to a small region, such that direct communication is possible between any pair of nodes. The physical communication model is that a receiver decodes the signal from a single transmitter, while treating all other signals as interference. Data packets are sent between source-destination pairs by multihop relaying. We assume that nodes self-organise...
This paper builds effective wireless patient management system (WPMS) using open software that can be accessed via a personal digital assistance (PDA) or a cell phone. This allows health care professionals to gain access to patient information from anywhere at anytime. In this project, the wireless patient management system was built using Java technology. The client side was implemented using MIDlet...
This paper proposes a scheme for domain partition to achieve the tradeoff between load-balancing and inter-domain mobility to reduce the negative impact of the host mobility. The load-balancing scheme for domains includes: an initialization procedure to divide a mesh network into domains, and a load adjustment procedure to rebalance the traffic load of neighboring domains when required. Moreover,...
This paper proposes a new heterogeneous multi-hop cellular IP (MCIP) network that integrates multi-hop communication with cellular IP. MCIP increases the coverage of the wireless network and improves the network robustness against adverse propagation phenomena by supporting communication in dead zones and areas with poor radio coverage. MCIP includes three components: location management, connection...
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