Guofeng Deng

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Due to the global nature of todaypsilas economy, cargo containers are the most commonly used form of transportation for the worldpsilas trade. Many government initiatives, regulations and mandates have introduced new requirements for cargo security since the events of 9/11. These necessary security investments for containers can produce new advantages in(More)
Cargo containers which transport 90 percent of the world's trade transit the countries of the world daily. Despite the vulnerability of cargo containers, only about 5 percent of the over 10 million cargo containers entering the U.S. each year can be inspected now. Our primary goal is to develop the smart container security system using RFID and Wireless(More)
Absence of line power supplies imposes severe constraints on nodes in wireless ad hoc and sensor networks. In this paper, we concentrate on finding a broadcast tree that maximizes the network’s lifetime. Previous studies showed that this problem is polynomially solvable when assuming the receiver consumes no energy or only the designated receiver consumes(More)
Most data integration systems focus on “data aggregation” applications, where individual data sources all export fragments of a single relation. Given a query, the primary query processing objective is to select the appropriate subset of sources to optimize conflicting user preferences. We develop an adaptive data aggregation framework to effectively gather(More)
In wireless ad hoc networks (WANETs), e.g. wireless sensor networks, battery-powered devices are constrained by limited amount of energy. Many WANET applications require that the duration (called lifetime) for which the network remains operational until the first node exhausts its battery energy is maximized. We study the problem of maximizing the lifetime(More)
In wireless ad hoc networks (WANETs), e.g. wireless sensor networks, battery-powered devices are constrained by limited amount of energy. Many WANET applications require that the duration (called lifetime) for which the network remains operational - until the first node exhausts its battery energy - is maximized. We study the problem of maximizing the(More)
The problem of maximizing multicast lifetime (MML) in wireless ad hoc networks is reexamined under a recently proposed transmitter-receiver power tradeoff (TRPT) model, for which the energy consumed by a node to reliably receive a bit is inversely proportional to the energy level at which the bit is transmitted. Under the TRPT model, MML was conjectured to(More)
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