Most classification algorithms are “passive”, in that they assign a class label to each instance based only on the description given, even if that description is incomplete. By contrast, an active classifier can — at some cost — obtain the values of some unspecified attributes, before deciding upon a class label. This can be useful, for instance, when deciding whether to gather information rele...

This paper analyzes bilateral multi-issue negotiation where the issues are indivisible, there are time constraints in the form of deadlines and discount factors. The issues are negotiated using the package deal procedure. The set of issues to be negotiated is called the negotiation agenda. The agenda is crucial since the outcome of negotiation depends on the agenda. This paper therefore looks a...

We estimate a value of the viscosity parameter in AGN accretion discs for the PG quasar sample. We assume that optical variability on time-scales of months to years is caused by local instabilities in the inner accretion disc. Comparing the observed variability time-scales to the thermal time-scales of α-disc models we obtain constraints on the viscosity parameter for the sample. We find that, ...

The problem of quickest detection of an anomalous process among M processes is considered. At each time, a subset of the processes can be observed, and the observations from each chosen process follow two different distributions, depending on whether the process is normal or abnormal. The objective is a sequential search strategy that minimizes the expected detection time subject to an error pr...

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