the purpose of this paper is to study the social aspects of nativization of using the internet by describing the manner of interaction of the users with the internet and the manner of application of the qualitative research method. to do so, the writer has first studied the characteristics of the information society, methods of using information and communication technology and the conceptual f...

We consider the problem of finding the mechanism that maximizes the revenue of a seller of multiple objects. This problem turns out to be significantlymore complex than the casewhere there is only a single object (which was solved by Myerson, 1981). The analysis is difficult even in the simplest case studied here, where there are two exclusive objects and a single buyer, with valuations uniform...

Setting prices for items is difficult because one needs to look at prices other substitutable as well as complimentary items. In a co-purchasing network, co-occurence of items can be exploited to tweak item prices for revenue maximization. In our report, we investigate the effects of co-occurrence of items on their prices. In general this problem seems to be NP-Hard. We propose heuristics based...

this guide to the identification of iranian freshwater snails has been prepared with aim of helping individuals involved in field work, but who have had no specialized training in taxonomy to differentiate snail specimens which they collect to certain groups by means of simple identification key. the guide pays special attention to the principal snail groups which transmit human schistosomiasis...

in a previous paper, the second author established that, given finite fields $f < e$ and certain subgroups $c leq e^times$, there is a galois connection between the intermediate field lattice ${l mid f leq l leq e}$ and $c$'s subgroup lattice. based on the galois connection, the paper then calculated the irreducible, complex character degrees of the semi-direct product $c rtimes {rm gal} (e/f)$...

In the present paper, we consider biflatness of certain classes of semigroupalgebras. Indeed, we give a necessary condition for a band semigroup algebra to bebiflat and show that this condition is not sufficient. Also, for a certain class of inversesemigroups S, we show that the biflatness of ell^{1}(S)^{primeprime} is equivalent to the biprojectivity of ell^{1}(S).