433 research outputs found

    What impacts more on innovation : Organizational context or individual competences ?

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    The present article examines the link between a firm’s organizational context and its capacity to be ambidextrous in terms of innovation. Although the management practices underlying context have a profound effect on innovation, their impact has not previously been investigated. Nor has research looked empirically at the individual competences that should be developed in order to favour specific types of innovation. Using a dataset of 174 firms, the present study shows that firms pursuing exploration and exploitation strategies in terms of innovation should adopt long-term oriented practices that favor risk taking and creativity, thus creating an appropriate organizational context. Competence management was found to have a strong moderating effect on the link between organizational context and innovation ambidexterity. Implications include the need to look at how management may increase innovation ambidexterity, and to chose appropriate combinations of competences and organizational context

    Gazelle: A Low Latency Framework for Secure Neural Network Inference

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    The growing popularity of cloud-based machine learning raises a natural question about the privacy guarantees that can be provided in such a setting. Our work tackles this problem in the context where a client wishes to classify private images using a convolutional neural network (CNN) trained by a server. Our goal is to build efficient protocols whereby the client can acquire the classification result without revealing their input to the server, while guaranteeing the privacy of the server's neural network. To this end, we design Gazelle, a scalable and low-latency system for secure neural network inference, using an intricate combination of homomorphic encryption and traditional two-party computation techniques (such as garbled circuits). Gazelle makes three contributions. First, we design the Gazelle homomorphic encryption library which provides fast algorithms for basic homomorphic operations such as SIMD (single instruction multiple data) addition, SIMD multiplication and ciphertext permutation. Second, we implement the Gazelle homomorphic linear algebra kernels which map neural network layers to optimized homomorphic matrix-vector multiplication and convolution routines. Third, we design optimized encryption switching protocols which seamlessly convert between homomorphic and garbled circuit encodings to enable implementation of complete neural network inference. We evaluate our protocols on benchmark neural networks trained on the MNIST and CIFAR-10 datasets and show that Gazelle outperforms the best existing systems such as MiniONN (ACM CCS 2017) by 20 times and Chameleon (Crypto Eprint 2017/1164) by 30 times in online runtime. Similarly when compared with fully homomorphic approaches like CryptoNets (ICML 2016) we demonstrate three orders of magnitude faster online run-time

    A memória da luz : customizações e encontros com o espectador

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    Tese (doutorado)—Universidade de Brasília, Instituto de Artes, Departamento de Artes Visuais, 2017.O presente trabalho fala do desenvolvimento e aplicação de simulacros computacionais da luz como opção poética que é estética e empiricamente investigada de modo a envolver a comparação de minhas percepções e meus horizontes, como artista, com os de meus espectadores, como forma de encontrar aproximações e distâncias entre essas percepções e horizontes enquanto criações necessariamente implicadas na fruição esteticamente qualificada desses simulacros, em favor de um maior entendimento sobre o que poderia ser um encontro ou comunicação possível entre autor e receptor e na expectativa de obter, pelo somatório de percepções e horizontes colhidos desses espectadores, uma revelação paulatina das propostas artísticas correspondentes a esses simulacros.This work is about the development and application of computer light simulacra as poetic option that is aesthetically and empirically investigated in a way that involves the comparison of my perceptions and horizons, as an artist, with those of my spectators, as a way to find the proximities and distances between those perceptions and horizons as creations necessarily implied in the fruition aesthetically qualified of these simulacra, in favor of a greater understanding of what could be a possible encounter or communication between author and receiver and in the expectation of a gradual revelation of the artistic proposals corresponding to these simulacra, by the sum of perceptions and horizons taken from those spectators

    Visualization 1_Deformation of fabricated PV-SWG.mp4

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    This is a video showing the manually dynamic stretch of the fabricated pitch-variable subwavelength grating

    Enhancement of 5-HT-induced sIPSC in pyramidal neurons of CA1 of KO mice is mediated by 5-HT3 receptors.

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    <p>A–E. Pharmacological modulation of sIPSC. Left: Examples of sIPSC traces. Right: summary data. sIPSC modulation by 20 µM 5-HT (A), by 5-HT in the presence of 20 µM 5-HT2 receptors antagonist ketanserin (keta) (B), by 20 µM 5-HT2 receptors agonist α-methyl-5-HT (α-Me-5-HT) (C), by 5-HT in the presence of 30 nM 5-HT3 receptor antagonist tropisetron (trop) and by 1 µM 5-HT3 receptor agonist <i>m</i>-chlorophenyl biguanide (<i>m</i>-CPBG). Number of cells recorded from is indicated in parenthesis. *p<0.05, **p<0.01. Data represent mean ± SEM.</p

    Reduction of gamma oscillation power in KO mice is partially reversed by 5-HT3 receptor antagonist tropisetron.

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    <p>A–B. Upper: Example traces of field oscillations in hippocampal area CA1 induced by carbachol in the presence of 30 nM tropisetron in slices from KO (KO+trop) (A) and WT (WT+trop) mice (B). Lower: Traces of oscillations obtained in the absence of tropisetron, are shown for comparison. C–D. Power spectra for oscillations in A (C) and B (D). E–F. Pooled data for integral oscillation power (20–80 Hz) in area CA1 in the presence of tropisetron (grey bars); data from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0016480#pone-0016480-g001" target="_blank">Fig. 1</a> obtained in the absence of tropisetron are shown for comparison (white bars). Number of cells recorded from is indicated in parenthesis. **p<0.01. Data represent mean ± SEM.</p

    Rescue of gamma oscillations in KO mice is achieved by blocking 5-HT3 receptor, but not by recombinant BDNF.

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    <p>A–D. Example traces of field oscillations in hippocampal area CA1 induced in slices from KO mice by carbachol without other drugs (A), in the presence of 30 nM tropisetron and 50 nM MLA (B), with 30 nM ondansetron (ondan) (C), and with 40 ng/ml BDNF (D). E. Pooled data for integral oscillation power (20–80 Hz) under conditions in A–D as indicated. Number of cells recorded from is shown in parenthesis. **p<0.01, ***p<0.01. Data represent mean ± SEM.</p

    Power of gamma oscillations is reduced in area CA1 but not CA3 in slices from KO mice.

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    <p>A–B. Example traces of field oscillations induced by 25 µM carbachol in hippocampal areas CA3 (A) and CA1 (B). C–D. Power spectra for oscillations in A (C) and B (D). E–F. Pooled data for integral oscillation power (20–80 Hz) in area CA3 (E) and CA1 (F). ***p<0.001. Data represent mean ± SEM.</p

    The land average density of the total tourism income of each city.

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    The land average density of the total tourism income of each city.</p
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