71,439 research outputs found

    Spectrum Allocation, Spectrum Commons and Public Goods: the Role of the Market

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    The reallocation of radio spectrum to valuable new and emerging technologies and services is essential to achieving the next wave of productivity and consumer benefits driven by ICT. Currently spectrum is not allocated to the most valuable uses, particularly the large amount of spectrum held for government use, and command and control management cannot respond fully or quickly in reallocating spectrum. To achieve a more economically efficient allocation and the greatest overall benefit market mechanisms including trading and spectrum pricing must be introduced. Complementary reforms in areas other than spectrum management will be required, and the appropriate boundary between market and non-market allocation mechanisms need to be established. Setting clear principles regarding the market/non-market boundary will help in resisting the inevitable rent seeking by incumbents and potential entrants during the transition to market mechanisms. Countries that do not face up to these challenges and move quickly will see their citizens disadvantaged as spectrum becomes a key economic resource.spectrum policy, auctions, trading, spectrum pricing, digital switchover, real options, public sector use, licence exempt use, infrastructure, Competition Policy

    SCIRIA Openmind seminar series, tactile perception and the will to figuration in Islamic art and new media art

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    SCIRIA ‘OpenMind’ was a regular seminar series for University of the Arts London staff, MA and PhD students and the public. The seminars were hosted at Camberwell College of Arts and Chelsea College of Art and Design. The footage, audio and flyers offer an insight into the research processes and activities of SCIRIA members, associates and external speakers

    Irreducible vector-valued modular forms of dimension less than six

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    An algebraic classification is given for spaces of holomorphic vector-valued modular forms of arbitrary real weight and multiplier system, associated to irreducible, T-unitarizable representations of the full modular group, of dimension less than six. For representations of dimension less than four, it is shown that the associated space of vector-valued modular forms is a cyclic module over a certain skew polynomial ring of differential operators. For dimensions four and five, a complete list of possible Hilbert-Poincare series is given, using the fact that the space of vector-valued modular forms is a free module over the ring of classical modular forms for the full modular group. A mild restriction is then placed on the class of representation considered in these dimensions, and this again yields an explicit determination of the associated Hilbert-Poincare series.Comment: AMS-LaTeX, 32 pages. This version will appear in Illinois J. Mat

    IQ variations across time and race are explained by literacy differences

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    Intelligence quotient (IQ) scores are intended to assess the cognitive competences of individuals, groups and populations. A body of data collected during the last 50 years has revealed that IQ average population scores vary significantly over time, nationality, and race. The causes of these variations remain a mystery. Theories focusing on nutrition, brain size, dysgenic factors, social class and education have proved inexact or unsatisfactory. Here I describe a new explanation based on the fact that intelligence test performance requires a level of literacy not present in all people to the same degree. I show that literacy variations across time, place and race are highly associated with changes in IQ scores. These findings have widespread implications. Contemporary IQ test score differences between populations and racial groups are predicted to diminish with rises in universal literacy in the 21st century

    Universal localisations and tilting modules for finite dimensional algebras

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    We study universal localisations, in the sense of Cohn and Schofield, for finite dimensional algebras and classify them by certain subcategories of our initial module category. A complete classification is presented in the hereditary case as well as for Nakayama algebras and local algebras. Furthermore, for hereditary algebras, we establish a correspondence between finite dimensional universal localisations and finitely generated support tilting modules. In the Nakayama case, we get a similar result using τ\tau-tilting modules, which were recently introduced by Adachi, Iyama and Reiten

    Results From an Analysis of the Mode Choice Decisions of Long Distance Business Travellers

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    Mode choice models for long distance business travellers have been calibrated, using data on actual choices, generally with the objetive of deriving demand elasticities and values of time for use in forecasting. The most recent such work using UK data dates from 1971. The results presented in this paper provide a much needed update of this earlier work. Mode choice models are estimated using data collected from two surveys of long distance business travellers. Two sets of choices are modelled: car versus rail and air versus rail, where one of the two modes was that used on a recent long distance business trip and the other was the traveller's best alternative mode for the trip. Most of these trips were between North East and South East England. The estimated values of time are found to be substantially larger than those obtained in past studies