In 1952, Heinrich Scholz published a question in The Journal of Symbolic Logic asking for a characterization of spectra, i.e., sets of natural numbers that are the cardinalities of finite models of first order sentences. Günter Asser in turn asked whether the complement of a spectrum is always a spectrum. These innocent questions turned out to be seminal for the development of finite model theory and descriptive complexity. In this paper we survey developments over the last 50-odd years pertaining to (...) the spectrum problem. Our presentation follows conceptual developments rather than the chronological order. Originally a number theoretic problem, it has been approached by means of recursion theory, resource bounded complexity theory, classification by complexity of the defining sentences, and finally by means of structural graph theory. Although Scholz' question was answered in various ways, Asser's question remains open. (shrink)

The development of the internet and other communications technologies over the past decade have seen a corresponding growth in the development and use of technologically-based research methodologies. This paper explores issues arising from the new technology which impact on ethics committees and how these might be addressed. Whilst some ethical issues are comparable in both online and offline worlds there are some elements of the techno-research which require extra consideration. Although ethics guidelines can be found on the worldwide web the (...) onus remains upon techno-researchers and ethics committee members to collaborate in deciding upon the ethical dilemmas and the rigour of proposed techno-research solutions. (shrink)