Broadcasting with network coding mixes packets to minimize the number of transmissions, which improves the energy efficiency of wireless networks. On the other hand, delaying the transmissions increases coding opportunities at intermediate nodes, but increases the delay of packets. In this paper, we consider these two contradicting factors and study the problem of minimizing the number of trans...

We propose a protocol to transfer a one-time-pad (in a probabilistic manner) from Alice to Bob, over a public channel. The proposed protocol is unique because Bob merely acts as the receiver of the pad (secret key), i.e. Bob does not need to send any message back to Alice unless he detects eavesdropping. Such a secure transfer of one-time-pad, over public channel, is not possible in classical c...

In this paper, we describe three different phenomena occurring on scales of 1 mm, 100 km, and almost a light year. The smallest scale is a laboratory experiment. The intermediate scale is a rocket-borne space experiment and the largest is an exploding star. In each case, deceleration creates a situation that is unstable to the Rayleigh-Taylor instability. The similarity exists in the spatial an...

Multigrid and related multilevel methods are the approaches of choice for solving the linear systems that result from discretization of a wide class of PDEs. A large gap, however, exists between the theoretical analysis of these algorithms and their actual performance. This paper focuses on the extension of the wellknown local mode (often local Fourier) analysis approach to a wider class of pro...

This paper is a winning contribution to the Graph Drawing Contest 2003. The task of drawing subgraphs is often underestimated and subgraphs are simply emphasized using different colors or line styles. In this paper, we present an approach for drawing graphs within graphs that layouts the subgraphs first and therefore increases their locality. We introduce connection sets emphasizing relationshi...

January 1998 The Defense Logistics Agency (DLA) maintains 40 million lines of code within 125 automated information systems. Over 80 percent of our major systems make use of date data in some way; half of those date references are high impact; that is, likely to adversely affect comparisons, calculations, or sort processes. DLA’s System Design Center (DSDC) is a feefor-service activity, and fun...

Integration of technical systems with business processes, and coherent strategies for the development of both, have long been recognised as critical to the competitiveness of companies. However, as separate systems become integrated, dependencies are established that complicate future reengineering exercises. These internal dependencies increase the risk associated with change, promote incremen...

Spectrum decision – i.e., the selection of a channel for the next hop – is one of the most important factors that affect the performance of a channel-hopping cognitive network. In this paper, we compare the performance of a number of channel selection algorithms through the probability of collisions with primary user transmissions. The results indicate that a simple histogram-based selection al...

In this work we propose an extension of a Federated System, named Information Broker, developed with the Italian Agency for Environmental Protection and Technical Services (APAT). The main objective of this proposal is to build an integrated system taking into account autonomous, distributed and heterogeneous geographic sources. Our extension is aimed at improving aspects as redundancy, consist...

OBJECTIVE To provide an understanding of the targeting strategies of cigarette marketing, and the functions and importance of the advertising images chosen. METHODS Analysis of historical corporate documents produced by affiliates of British American Tobacco (BAT) and RJ Reynolds (RJR) in Canadian litigation challenging tobacco advertising regulation, the Tobacco Products Control Act (1987): ...