2,422 research outputs found

    Nursing mentally defective babies: whose responsibility is it?

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    The problem is conveniently presented by reference to two letters of application for accommodation addressed to the physician superintendent of a State institution for mental defectives

    Oasis, A school for retarded children

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    Modelling Social Structures and Hierarchies in Language Evolution

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    Language evolution might have preferred certain prior social configurations over others. Experiments conducted with models of different social structures (varying subgroup interactions and the role of a dominant interlocutor) suggest that having isolated agent groups rather than an interconnected agent is more advantageous for the emergence of a social communication system. Distinctive groups that are closely connected by communication yield systems less like natural language than fully isolated groups inhabiting the same world. Furthermore, the addition of a dominant male who is asymmetrically favoured as a hearer, and equally likely to be a speaker has no positive influence on the disjoint groups.Comment: 14 pages, 3 figures, 1 table. In proceedings of AI-2010, The Thirtieth SGAI International Conference on Innovative Techniques and Applications of Artificial Intelligence, Cambridge, England, UK, 14-16 December 201

    Letter from H.W. Smith, Ian Runkin & E.L. Hazel to James B. Finley

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    Smith heads a committee from the London Division, Sons of Temperance. The committee invites Finley to speak at their group\u27s celebration, to be held on October 14th. All expenses will be paid. Abstract Number - 1180https://digitalcommons.owu.edu/finley-letters/2161/thumbnail.jp

    Orientation of dichroic dyes in ultra-drawn polyethylenes

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    The excellent solid-state drawing characteristics of linear polyethylenes were exploited for the orientation of dichroic dyes. Polarizers with high transparency and high level of optical anisotropy were produced from the drawn films contg. anthraquinone or azo dyes. [on SciFinder (R)

    Approximation Algorithms for the Max-Buying Problem with Limited Supply

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    We consider the Max-Buying Problem with Limited Supply, in which there are nn items, with CiC_i copies of each item ii, and mm bidders such that every bidder bb has valuation vibv_{ib} for item ii. The goal is to find a pricing pp and an allocation of items to bidders that maximizes the profit, where every item is allocated to at most CiC_i bidders, every bidder receives at most one item and if a bidder bb receives item ii then pivibp_i \leq v_{ib}. Briest and Krysta presented a 2-approximation for this problem and Aggarwal et al. presented a 4-approximation for the Price Ladder variant where the pricing must be non-increasing (that is, p1p2pnp_1 \geq p_2 \geq \cdots \geq p_n). We present an e/(e1)e/(e-1)-approximation for the Max-Buying Problem with Limited Supply and, for every ε>0\varepsilon > 0, a (2+ε)(2+\varepsilon)-approximation for the Price Ladder variant

    Challenges of open innovation: the paradox of firm investment in open-source software

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    Open innovation is a powerful framework encompassing the generation, capture, and employment of intellectual property at the firm level. We identify three fundamental challenges for firms in applying the concept of open innovation: finding creative ways to exploit internal innovation, incorporating external innovation into internal development, and motivating outsiders to supply an ongoing stream of external innovations. This latter challenge involves a paradox, why would firms spend money on R&D efforts if the results of these efforts are available to rival firms? To explore these challenges, we examine the activity of firms in opensource software to support their innovation strategies. Firms involved in open-source software often make investments that will be shared with real and potential rivals. We identify four strategies firms employ – pooled R&D/product development, spinouts, selling complements and attracting donated complements – and discuss how they address the three key challenges of open innovation. We conclude with suggestions for how similar strategies may apply in other industries and offer some possible avenues for future research on open innovation

    Subthreshold phi-meson production in heavy-ion collisions

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    Within a transport code of BUU type the production of phi-mesons in the reactions Ni+Ni at 1.93 AGeV and Ru+Ru at 1.69 AGeV is studied. New elementary reaction channels rho+N(Delta) to phi+N and pi+N(1520) to phi+N are included. In spite of a substantial increase of the \phi multiplicities by these channels the results stay below the tentative numbers extracted from experimental data.Comment: 17 pages(LaTeX), two new figures adde

    The long-term agronomic and economic effects of crop rotations in western Canada

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    Non-Peer ReviewedAgriculture Canada Research Stations in western Canada have conducted more than 68 long-term crop rotation experiments since the early 1900's; twenty of these are still ongoing. A committee of scientists, representing all Research Stations on the Prairies has just completed an in-depth review and summary of the major findings from these studies. Based on their findings, they also developed recommendations that can be used by managers in decision making and rationalization of resource use for current and future studies of this kind. The resulting two publications which will be released in early 1990 include: i) a bulletin entitled 'Benefits of Crop Rotation for Sustainable Agriculture in Dryland Farming', 'Which presents producer recommendations on how to run an efficient, economical, and environmentally responsible cropping operation, and ii) a detailed technical book entitled 'Crop Rotation Studies on the Canadian Prairies', which is directed at the scientific community but is also useful for extension personnel and producers. This paper highlights some of the main aspects reported in these publications and attempts to give a coherent and broader interpretation of the underlying principles and processes of crop production. The discussion focuses on the effects of rotation length, crop sequence, substitutes for summerfallow, and N and P fertilizer, on crop production, grain and forage quality, soil moisture conservation and moisture use efficiency, N and P uptake by the plants, nutrient losses, soil quality, profitability, nonrenewable energy efficiency, and crop pests

    Proof of the Hyperplane Zeros Conjecture of Lagarias and Wang

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    We prove that a real analytic subset of a torus group that is contained in its image under an expanding endomorphism is a finite union of translates of closed subgroups. This confirms the hyperplane zeros conjecture of Lagarias and Wang for real analytic varieties. Our proof uses real analytic geometry, topological dynamics and Fourier analysis.Comment: 25 page
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