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The recent surge in popularity of e-commerce prompted a lot of activity in the area of electronic payments. Solutions have been developed for cash, credit card and check-based electronic transactions. Much less attention has been paid to non-monetary commerce such as barter. In this paper we discuss the notion of \secure group barter" or multi-party fair exchange. We develop a classiication of ...

Traditional quality assurance checks of a patient's radiation therapy plan involve printing out treatment parameters from the treatment planning system and the "record and verify" (R&V) system and visually checking the information for one-to-one correspondence. In a paperless environment, one can automate this process through independent software that can read the treatment planning data direct...

On September 25, 2001, the Payment Cards Center of the Federal Reserve Bank of Philadelphia sponsored a workshop on innovations in small dollar payments. The moderated discussion was led by Richard Corl, an entrepreneur with 25 years of experience in the electronic payments industry. From his perspective as a director of Ecount, a small dollar payments innovator, Corl described a range of chall...

We study a simple electronic boardroom voting system. While most existing systems rely on opaque electronic devices, a scientific committee of a research institute (the CNRS Section 07) has recently proposed an alternative system. Despite its simplicity (in particular, no use of cryptography), each voter can check that the outcome of the election corresponds to the votes, without having to trus...

The screening properties of fullerene molecules are described by means of a continuum model which uses the electronic wavefunctions of planar graphite as a starting point. The long distance behavior of the system gives rise to a renormalizable theory, which flows towards a non trivial fixed point. Its existence implies an anomalous dielectric constant. The screening properties are neither metal...