With the phenomenal growth of the Internet and open networks in general, security services, such as non-repudiation, become crucial to many applications. Nonrepudiation services m...
ks are quite di cult to understand when one rst uses them: the design is very abstract, to factor out commonality the design is incomplete, requiring additional subclasses to creat...
Many systems that exhibit nonmonotonic behavior have been described and studied already in the literature. The general notion of nonmonotonic reasoning, though, has almost always ...
We analyze the effects of Doppler spread in mobile channels on Orthogonal Frequency Division Multiplex (OFDM) systems. This is important, since channel variations during one OFDM s...
In this paper we describe Astra, a computational aid for generating process explanations in nuclear astrophysics. The system operates in two stages, the rst using knowledge of qua...