163 research outputs found

    Not All \u3ci\u3eAgua\u3c/i\u3e Is \u3ci\u3eCaliente\u3c/i\u3e: Proposing the \u3ci\u3eWinters\u3c/i\u3e Groundwater Test

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    I. Introduction II. The Winters Doctrine ... A. Winters v. United States ... B. Development of the Winters Doctrine III. The Winters Doctrine Applied to Groundwater ... A. Growing Trend of Recognizing Federal Reserved Groundwater Rights ... B. Agua Caliente ... C. Agua Caliente’s Always-Never Approach IV. Proposing the Winters Groundwater Test ... A. Primary Purpose Prong ... B. Actual Need Prong ... C. Sensitivity Prong V. Conclusio

    Governing Artificial Intelligence to benefit the UN Sustainable Development Goals

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    Big Tech's unregulated roll-out out of experimental AI poses risks to the achievement of the UN Sustainable Development Goals (SDGs), with particular vulnerability for developing countries. The goal of financial inclusion is threatened by the imperfect and ungoverned design and implementation of AI decision-making software making important financial decisions affecting customers. Automated decision-making algorithms have displayed evidence of bias, lack ethical governance, and limit transparency in the basis for their decisions, causing unfair outcomes and amplify unequal access to finance. Poverty reduction and sustainable development targets are risked by Big Tech's potential exploitation of developing countries by using AI to harvest data and profits. Stakeholder progress toward preventing financial crime and corruption is further threatened by potential misuse of AI. In the light of such risks, Big Tech's unscrupulous history means it cannot be trusted to operate without regulatory oversight. The article proposes effective pre-emptive regulatory options to minimize scenarios of AI damaging the SDGs. It explores internationally accepted principles of AI governance, and argues for their implementation as regulatory requirements governing AI developers and coders, with compliance verified through algorithmic auditing. Furthermore, it argues that AI governance frameworks must require a benefit to the SDGs. The article argues that proactively predicting such problems can enable continued AI innovation through well-designed regulations adhering to international principles. It highlights risks of unregulated AI causing harm to human interests, where a public and regulatory backlash may result in over-regulation that could damage the otherwise beneficial development of AI.Qatar National Research Fund, Grant/Award Number: NPRP 11S-1119-17001

    Constrained Dynamic Tree Networks

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    We generalise Constrained Dynamic Pushdown Networks, introduced by Bouajjani\et al, to Constrained Dynamic Tree Networks.<br>In this model, we have trees of processes which may monitor their children.<br>We allow the processes to be defined by any computation model for which the alternating reachability problem is decidable.<br>We address the problem of symbolic reachability analysis for this model. More precisely, we consider the problem of computing an effective representation of their reachability<br>sets using finite state automata. <div>We show that backwards reachability sets starting from regular sets of configurations are always regular. </div><div>We provide an algorithm for computing backwards reachability sets using tree automata.<br><br></div

    Combining Feature Selection and Integration—A Neural Model for MT Motion Selectivity

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    Background: The computation of pattern motion in visual area MT based on motion input from area V1 has been investigated in many experiments and models attempting to replicate the main mechanisms. Two different core conceptual approaches were developed to explain the findings. In integrationist models the key mechanism to achieve pattern selectivity is the nonlinear integration of V1 motion activity. In contrast, selectionist models focus on the motion computation at positions with 2D features. Methodology/Principal Findings: Recent experiments revealed that neither of the two concepts alone is sufficient to explain all experimental data and that most of the existing models cannot account for the complex behaviour found. MT pattern selectivity changes over time for stimuli like type II plaids from vector average to the direction computed with an intersection of constraint rule or by feature tracking. Also, the spatial arrangement of the stimulus within the receptive field of a MT cell plays a crucial role. We propose a recurrent neural model showing how feature integration and selection can be combined into one common architecture to explain these findings. The key features of the model are the computation of 1D and 2D motion in model area V1 subpopulations that are integrated in model MT cells using feedforward and feedback processing. Our results are also in line with findings concerning the solution of the aperture problem. Conclusions/Significance: We propose a new neural model for MT pattern computation and motion disambiguation that i

    Cortical Surround Interactions and Perceptual Salience via Natural Scene Statistics

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    Spatial context in images induces perceptual phenomena associated with salience and modulates the responses of neurons in primary visual cortex (V1). However, the computational and ecological principles underlying contextual effects are incompletely understood. We introduce a model of natural images that includes grouping and segmentation of neighboring features based on their joint statistics, and we interpret the firing rates of V1 neurons as performing optimal recognition in this model. We show that this leads to a substantial generalization of divisive normalization, a computation that is ubiquitous in many neural areas and systems. A main novelty in our model is that the influence of the context on a target stimulus is determined by their degree of statistical dependence. We optimized the parameters of the model on natural image patches, and then simulated neural and perceptual responses on stimuli used in classical experiments. The model reproduces some rich and complex response patterns observed in V1, such as the contrast dependence, orientation tuning and spatial asymmetry of surround suppression, while also allowing for surround facilitation under conditions of weak stimulation. It also mimics the perceptual salience produced by simple displays, and leads to readily testable predictions. Our results provide a principled account of orientation-based contextual modulation in early vision and its sensitivity to the homogeneity and spatial arrangement of inputs, and lends statistical support to the theory that V1 computes visual salience

    Effects of Anacetrapib in Patients with Atherosclerotic Vascular Disease

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    BACKGROUND: Patients with atherosclerotic vascular disease remain at high risk for cardiovascular events despite effective statin-based treatment of low-density lipoprotein (LDL) cholesterol levels. The inhibition of cholesteryl ester transfer protein (CETP) by anacetrapib reduces LDL cholesterol levels and increases high-density lipoprotein (HDL) cholesterol levels. However, trials of other CETP inhibitors have shown neutral or adverse effects on cardiovascular outcomes. METHODS: We conducted a randomized, double-blind, placebo-controlled trial involving 30,449 adults with atherosclerotic vascular disease who were receiving intensive atorvastatin therapy and who had a mean LDL cholesterol level of 61 mg per deciliter (1.58 mmol per liter), a mean non-HDL cholesterol level of 92 mg per deciliter (2.38 mmol per liter), and a mean HDL cholesterol level of 40 mg per deciliter (1.03 mmol per liter). The patients were assigned to receive either 100 mg of anacetrapib once daily (15,225 patients) or matching placebo (15,224 patients). The primary outcome was the first major coronary event, a composite of coronary death, myocardial infarction, or coronary revascularization. RESULTS: During the median follow-up period of 4.1 years, the primary outcome occurred in significantly fewer patients in the anacetrapib group than in the placebo group (1640 of 15,225 patients [10.8%] vs. 1803 of 15,224 patients [11.8%]; rate ratio, 0.91; 95% confidence interval, 0.85 to 0.97; P=0.004). The relative difference in risk was similar across multiple prespecified subgroups. At the trial midpoint, the mean level of HDL cholesterol was higher by 43 mg per deciliter (1.12 mmol per liter) in the anacetrapib group than in the placebo group (a relative difference of 104%), and the mean level of non-HDL cholesterol was lower by 17 mg per deciliter (0.44 mmol per liter), a relative difference of -18%. There were no significant between-group differences in the risk of death, cancer, or other serious adverse events. CONCLUSIONS: Among patients with atherosclerotic vascular disease who were receiving intensive statin therapy, the use of anacetrapib resulted in a lower incidence of major coronary events than the use of placebo. (Funded by Merck and others; Current Controlled Trials number, ISRCTN48678192 ; ClinicalTrials.gov number, NCT01252953 ; and EudraCT number, 2010-023467-18 .)

    Not All \u3ci\u3eAgua\u3c/i\u3e Is \u3ci\u3eCaliente\u3c/i\u3e: Proposing the \u3ci\u3eWinters\u3c/i\u3e Groundwater Test

    Get PDF
    I. Introduction II. The Winters Doctrine ... A. Winters v. United States ... B. Development of the Winters Doctrine III. The Winters Doctrine Applied to Groundwater ... A. Growing Trend of Recognizing Federal Reserved Groundwater Rights ... B. Agua Caliente ... C. Agua Caliente’s Always-Never Approach IV. Proposing the Winters Groundwater Test ... A. Primary Purpose Prong ... B. Actual Need Prong ... C. Sensitivity Prong V. Conclusio

    Strategische Spracherfahrung. Die Verbindung zwischen Erfahrung von Sprachlernenden und erfolgreichen Sprachstrategien

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    Diese Studie untersucht Sprachlernende und versucht zu beobachten, welche sprachlernenden Strategien sie benutzen. Die Studie untersucht insbesondere, ob es eine Verbindung gibt zwischen dem Lernstil von Sprachenlernenden und der Zeit, die die Sprachlernenden mit dem Sprachstudium verbracht haben. Um diese Frage zu beantworten, analysiert die Studie drei Personen, die Spanisch lernen. Alle drei haben unterschiedlich lange mit der Sprache verbracht und wurden entsprechend verschiedenen Sprachebenen ausgesetzt. Alle drei haben unterschiedliche Familienverbindungen zur Sprache: eine Person sprach eine Mischung von Spanisch und Englisch in ihrer Familie und studierte ein Semester in einem spanischsprechenden Land, eine andere Person sprach nie zuhause, verbrachte aber sechs Wochen in einem spanischsprechenden Land und die letzte Person sprach nie zuhause und befand sich auch nie in einem spanischsprechenden Land. Die Zeit, die diese drei Teilnehmer mit der Sprache verbracht haben, wird mit der Anzahl der Strategien der Teilnehmer verglichen. Die Strategien wurden mit Hilfe einer ausführlichen Umfrage ermittelt, die die Teilnehmer beantworten mussten. Die Umfrage wurde von Andrew Cohen entwickelt, der Sprachlernstrategien von Sprachlernenden untersucht. Cohen studiert Sprachlernstrategien an der University of Minnesota. Er ist der Autor zahlreicher Veröffentlichungen über die Notwendigkeit von Strategien beim Erlernen von Sprachen. Obwohl Cohen und andere schon vieles über Strategien und deren Vorteile geschrieben haben, wurde dieser Themenbereich weitgehend ignoriert. In dieser Studie werden Vermutungen untersucht, die von Cohen noch nie untersucht wurden. Es ist vielen Sprachenlernenden bewusst, dass Strategien wichtig sind, um eine Sprache zu lernen, welche Rolle spielen aber Strategien mit praktischer Erfahrung in der Sprache? Mit der Untersuchung dieser Frage beantwortet diese Studie eine entscheidende Frage in der Forschung von Cohen
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