David J. Dorsey

  • Citations Per Year
Learn More
Secure mobile wireless ad-hoc networks are frequently described in the technical literature as highly-desired and feasible. However only few stable and scalable physical realizations of such MANETs were actually reported. Here, we describe SWAT (a secure wireless agent-based testbed), a physical network of handheld and stationary computing nodes that(More)
This work presents an analysis of a cluster of finite population of low cost sensor nodes operating in a ppersistent S-Aloha framework with multipacket messages. Using this analytical framework, we consider the issue of partitioning the nodes and available frequencies into groups so as to maximize the system throughput. Assigning the nodes and frequencies(More)
This work proposes a framework for jamming wireless networks that incorporates probabilistic models of internal states and observable characteristics of link protocols, where protocols are divided into two general classes: random access (RA) or channelized access (CA). Without exact knowledge of network parameters and internal state, the proposed(More)
In this paper, we consider the problem of placing, with course-grained control, a large number of wireless networked sensor nodes employing a clustering network architecture. The goal of the deployment strategy is to maximize the lifetime while ensuring connectivity between cluster-heads so that samples from the monitored area may be forwarded to a fusion(More)
The distribution of data in large dynamic wireless sensor networks presents a difficult problem due to node mobility, link failures, and traffic congestion. In this paper, we propose a framework for adaptive flooding protocols suitable for disseminating data in large-scale dynamic networks without a central controlling entity. The framework consists of(More)
Pneumopericardium and pneumomediastinum following closed chest injury are rare findings, especially when symptoms are delayed for several days and are not associated with other related traumatic entities. A case is presented of a 14-year-old boy who developed symptoms of precordial chest pains and splinting two days after sustaining a direct blow to his(More)
We will demonstrate the Secure Wireless Agent Testbed (SWAT), a unique facility developed at Drexel University to study integration, networking and information assurance for next-generation wireless mobile agent systems. SWAT is an implemented system that fully integrates: (1) mobile agents, (2) wireless ad hoc multi-hop networks, and (3) security. The(More)
The distribution of data in large-scale dynamic wireless networks presents a difficult problem for network designers due to node mobility, unreliable links, and traffic congestion. In this work, we propose a framework for adaptive data dissemination protocols suitable for distributing data in large-scale dynamic networks without a central controlling(More)