104,664 research outputs found

    A Little Fog for a Large Turn

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    Small, carefully crafted perturbations called adversarial perturbations can easily fool neural networks. However, these perturbations are largely additive and not naturally found. We turn our attention to the field of Autonomous navigation wherein adverse weather conditions such as fog have a drastic effect on the predictions of these systems. These weather conditions are capable of acting like natural adversaries that can help in testing models. To this end, we introduce a general notion of adversarial perturbations, which can be created using generative models and provide a methodology inspired by Cycle-Consistent Generative Adversarial Networks to generate adversarial weather conditions for a given image. Our formulation and results show that these images provide a suitable testbed for steering models used in Autonomous navigation models. Our work also presents a more natural and general definition of Adversarial perturbations based on Perceptual Similarity.Comment: Accepted to WACV 202

    The Price of Fog: a Data-Driven Study on Caching Architectures in Vehicular Networks

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    Vehicular users are expected to consume large amounts of data, for both entertainment and navigation purposes. This will put a strain on cellular networks, which will be able to cope with such a load only if proper caching is in place, this in turn begs the question of which caching architecture is the best-suited to deal with vehicular content consumption. In this paper, we leverage a large-scale, crowd-collected trace to (i) characterize the vehicular traffic demand, in terms of overall magnitude and content breakup, (ii) assess how different caching approaches perform against such a real-world load, (iii) study the effect of recommendation systems and local contents. We define a price-of-fog metric, expressing the additional caching capacity to deploy when moving from traditional, centralized caching architectures to a "fog computing" approach, where caches are closer to the network edge. We find that for location-specific contents, such as the ones that vehicular users are most likely to request, such a price almost disappears. Vehicular networks thus make a strong case for the adoption of mobile-edge caching, as we are able to reap the benefit thereof -- including a reduction in the distance traveled by data, within the core network -- with little or no of the associated disadvantages.Comment: ACM IoV-VoI 2016 MobiHoc Workshop, The 17th ACM International Symposium on Mobile Ad Hoc Networking and Computing: MobiHoc 2016-IoV-VoI Workshop, Paderborn, German

    The Official Student Newspaper of UAS

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    UAS Answers: Everybody's got one... -- A Thank you from Alaskapella -- Submit Your Work -- That was a thing! -- Featured Student Piece: Fight of Fear -- What's the Scoop UAS: Use the Voice! -- The College-Relatable Country Club -- Murder and Free Candy Day -- UAS Eats: The Best Bread Pudding -- About that Fog Now -- Getting to Know: Paul Rostad -- Campus Calenda

    Spartan Daily, March 1, 1935

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    Volume 23, Issue 95https://scholarworks.sjsu.edu/spartandaily/2273/thumbnail.jp

    The Impact of Climate Change on Coastal Fog Hours of California\u27s Central Coast

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    This study used observations and downscaled model output from the Coupled Model Intercomparison Project 5 to investigate diurnal temperature differences and their relationship to the number of fog hours in the future along California’s central coast. The study area extended north-south from Bodega Bay to the Santa Lucia Range and east-west from the coast of California to the western flank of the Sierra Nevada Mountains. Analyses of Representative Concentration Pathway (RCP) scenarios 4.5 and 8.5 showed that most of California’s central coast will likely see minimal changes in the number of fog hours per day through the turn of the century. However, fog hours in the northern portion of the study area showed a reduction of up to an hour and a half per day, while southern areas showed an increase by more than an hour and a half per day by the turn of the century. The implications of these changes will vary depending on the timing of the increase or decrease. Further research is needed to look at timing of fog events

    Volume 9, Issue 1: Full Issue

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    Full issue of the March 2014 issue of Manuscripts. Includes work by: Joseph Berry, Mary Wiley, Jeanne Gass, John Ross, Mary Margrette Schortemeier, Helen Hughes, Jean Pastor, Marijane Badger, Hariet Bishop, Jack Kilgore, Jean Bowden, Dean Wildman, Elizabeth Clark, Rachel Whelan, Robert L. Harris, Ed McNamara, Frances Shemelson, Josephine Rosenfeld, Geraldine Staley, Tom Wagle, Keith White, Betty Lee Snyder, James Hawekotte, Riley Sullivan, Ardath Weigler, John Rock, and Jim Mitchell

    Potential bronchoconstrictor stimuli in acid fog.

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    Acid fog is complex and contains multiple stimuli that may be capable of inducing bronchoconstriction. These stimuli include sulfuric and niric acids, the principal inorganic acids present; sulfites, formed in the atmosphere as a reaction product of sulfur dioxide and water droplets; fog water itself, a hypoosmolar aerosol; the organic acid hydroxymethanesulfonate, the bisulfite adduct of formaldehyde; and gaseous pollutants, e.g., sulfur dioxide, oxides of nitrogen, ozone. Given this complexity, evaluation of the respiratory health effects of naturally occurring acid fog requires assessment of the bronchoconstrictor potency of each component stimulus and possible interactions among these stimuli. We summarize the results of three studies that involve characterization of the bronchoconstrictor potency of acid fog stimuli and/or their interaction in subjects with asthma. The results of the first study indicate that titratable acidity appears to be a more important stimulus to bronchoconstriction than is pH. The results of the second study demonstrate that sulfite species are capable of inducing bronchoconstriction, especially when inhaled at acid pH. The results of the third study suggest that acidity can potentiate hypoosmolar fog-induced bronchoconstriction

    The Fog of War: Large-Scale Smoke Screening Operations of First Canadian Army in Northwest Europe

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    Smoke screens have been employed in sea and land warfare for many centuries for a variety of purposes. They have been used to conceal troop movements, to deceive the enemy as to combat strengths, point of attack, and preparations for offensive operations. During the Second World War all armies made use of smoke screns in their operations to a greater or lesser extent. Canada was no exception and was considered to be extremely innovative in the use of smoke equipment in ways for which it was not designed. The First Canadian Army first employed large-scale non-artillery-projected smoke screens during the campaign in Northwest Europe. For the first time, at least in the history of Canadian operations, units of trained specialists worked to lay down smoke screens in the field
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