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Annual Allerton Conference on Communication, Control, and Computing

作者： Alireza Vahid Ilan Shomorony Robert Calderbank the department of Electrical and Computer Engineering Duke University the Department of Electrical Engineering and Computer Science UC Berkeley department of Electrical and Computer Engineering Duke University

ISBN: (纸本)9781509018253

We study the impact of delayed channel state information at the transmitters (CSIT) in two-unicast wireless networks with a layered topology and arbitrary connectivity. We introduce a technique to obtain outer bounds to the degrees-of-freedom (DoF) region through the new graph-theoretic notion of bottleneck nodes. Such nodes act as informational bottlenecks only under the assumption of delayed CSIT, and imply asymmetric DoF bounds of the form mD_1 + D_2 < m. Combining this outer-bound technique with new achievability schemes, we characterize the sum DoF of a class of two-unicast wireless networks, which shows that, unlike in the case of instantaneous CSIT, the DoF of two-unicast networks with delayed CSIT can take an infinite set of values.

关键词： Informational Bottlenecks Delayed CSIT new graph-theoretic notion

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Analyzing sedentary behavior in life-logging images

Analyzing sedentary behavior in life-logging images

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作者： Moghimi, Mohammad Wu, Wanmin Chen, Jacqueline Godbole, Suneeta Marshall, Simon Kerr, Jacqueline Belongie, Serge Department of Computer Science and Engineering UC San Diego United States Department of Family and Preventive Medicine UC San Diego United States Department of Computer Science Cornell University Cornell NYC Tech United States

ISBN: (纸本)9781479957514

We describe a study that aims to understand physical activity and sedentary behavior in free-living settings. We employed a wearable camera to record 3 to 5 days of imaging data with 40 participants, resulting in over 360,000 images. These images were then fully annotated by experienced staff with a rigorous coding protocol. We designed a deep learning based classifier in which we adapted a model that was originally trained for ImageNet [1]. We then added a spatio-temporal pyramid to our deep learning based classifier. Our results show our proposed method performs better than the state-of-the-art visual classification methods on our dataset. For most of the labels our system achieves more than 90% average accuracy across different individuals for frequent labels and more than 80% average accuracy for rare labels. © 2014 IEEE.

关键词： Image classification

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Using crowdsourced satellite SNR measurements for 3D mapping and real-time GNSS positioning improvement 14

Using crowdsourced satellite SNR measurements for 3D mapping...

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6th ACM MobiCom Workshop on Wireless of the Students, by the Students, for the Students, S3 2014

作者： Irish, Andrew T. Iland, Daniel Isaacs, Jason T. Hespanha, João P. Belding, Elizabeth M. Madhow, Upamanyu Dept. of Electrical and Computer Engineering UC Santa Barbara Santa BarbaraCA93106 United States Dept. of Computer Science UC Santa Barbara Santa BarbaraCA93106 United States

ISBN: (纸本)9781450330732

Geopositioning using Global Navigation Satellite Systems (GNSS), such as the Global Positioning System (GPS), is inaccurate in urban environments due to frequent non-line-of-sight (NLOS) signal reception. This poses a major problem for mobile services that benefit from accurate urban localization, such as navigation, hyperlocal advertising, and geofencing applications. However, urban NLOS signal reception can be exploited in two ways. First, one can use satellite signal-to-noise ratio (SNR) measurements crowdsourced from mobile devices to create 3D environment maps. This is possible because, for example, the SNR of signals obstructed by buildings is lower on average than that of line-of-sight (LOS) signals. Second, in a sort of reverse process called Shadow Matching, SNR readings from a particular device at an instant in time can be compared to 3D maps to provide real-time localization improvement. In this paper we give a brief overview of how such a system works and describe a scalable, low-cost, software-only architecture that implements it. Copyright 2014 ACM.

关键词： Global positioning system

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PTRAN's analysis and optimization techniques 25

PTRAN's analysis and optimization techniques

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25th ACM International Conference on Supercomputing, ICS 2014

作者： Cytron, Ron K. Ferrante, Jeanne Computer Science and Engineering Washington University Box 1045 One Brookings Drive St LouisMO63130 United States Computer Science and Engineering UC San Diego 9500 Gilman Drive San DiegoCA United States

The PTRAN (Parallel Translator) system at IBM had as its goal the analysis and optimization of sequential programs for parallel architectures. In this paper, we give our perspective on what has changed since PTRAN, an... 详细信息

ISBN: (纸本)9781450328401

关键词： Parallel architectures

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Solving the user equilibrium departure time problem at an off-ramp with incentive compatible cost functions

Solving the user equilibrium departure time problem at an of...

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European Control Conference

作者： Samitha Samaranayake Axel Parmentier Yiguang (Ethan) Xuan Alexandre Bayen Department of Civil and Environmental Engineering at the UC Berkeley Centre d'Enseignement et de Recherche en Mathmatiques et Calcul Scientifique at Ecole des Ponts California Partners for Advanced Transportation Technology at UC Berkeley Department of Electrical Engineering and Computer Science at UC Berkeley

ISBN: (纸本)9781467371605

We consider the equilibrium departure time problem for a set of vehicles that travel through a network with capacity restrictions and need to reach a destination at a fixed time. The vehicles incur a penalty for both any queuing delays and arriving at the destination early or late. In particular, we consider the case of a congested off-ramp, which is a common occurrence next to commercial hubs during the morning commute, and has the added negative effect of reducing the capacity on the freeway for through traffic. We study the use of incentives and tolls to manipulate the equilibrium departure times of the exiting vehicles and thereby mitigate the impact on through traffic. Our main result is to show the existence and uniqueness properties of the departure time equilibrium for a general class of delay and arrival time cost functions, which allows for discontinuities in the arrival cost function. This enables the use of step incentives or tolls, which are the mostly common strategies used in practice. Our results also apply to the Vickrey single bottleneck equilibrium, which is a special case of our network.

关键词： Vehicles Cost function Delays Traffic control Analytical models Schedules

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Willow: a user-programmable SSD 14

Willow: a user-programmable SSD

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Proceedings of the 11th USENIX conference on Operating Systems Design and Implementation

作者： Sudharsan Seshadri Mark Gahagan Sundaram Bhaskaran Trevor Bunker Arup De Yanqin Jin Yang Liu Steven Swanson Computer Science & Engineering UC San Diego

ISBN: (纸本)9781931971164

We explore the potential of making programmability a central feature of the SSD interface. Our prototype system, called Willow, allows programmers to augment and extend the semantics of an SSD with application-specific features without compromising file system protections. The SSD Apps running on Willow give applications low-latency, high-bandwidth access to the SSD's contents while reducing the load that IO processing places on the host processor. The programming model for SSD Apps provides great flexibility, supports the concurrent execution of multiple SSD Apps in Willow, and supports the execution of trusted code in *** demonstrate the effectiveness and flexibility of Willow by implementing six SSD Apps and measuring their performance. We find that defining SSD semantics in software is easy and beneficial, and that Willow makes it feasible for a wide range of IO-intensive applications to benefit from a customized SSD interface.

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THE ASTROPY PROJECT: BUILDING AN INCLUSIVE, OPEN-science PROJECT AND STATUS OF THE V2.0 CORE PACKAGE

arXiv

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arXiv 2018年

作者： Price-Whelan, A.M. Günther, H.M. Lim, P.L. Crawford, S.M. Conseil, S. Shupe, D.L. Craig, M.W. Dencheva, N. Ginsburg, A. VanderPlas, J.T. Bradley, L.D. Pérez-Suárez, D. de Val-Borro, M. Aldcroft, T.L. Cruz, K.L. Robitaille, T.P. Tollerud, E.J. Ardelean, C. Babej, T. Bachetti, M. Bamford, S.P. Barentsen, G. Barmby, P. Baumbach, A. Biscani, F. Boquien, M. Bostroem, K.A. Bouma, L.G. Brammer, G.B. Breytenbach, H. Buddelmeijer, H. Burke, D.J. Calderone, G. Cara, M. Cardoso, J.V.M. Cheedella, S. Copin, Y. Crichton, D. D’Avella, D. Deil, C. Depagne, É. Dietrich, J.P. Donath, A. Droettboom, M. Earl, N. Erben, T. Fabbro, S. Ferreira, L.A. Garrison, L.H. Gibbons, S.L.J. Goldstein, D.A. Gommers, R. Greco, J.P. Greenfield, P. Groener, A.M. Hagen, A. Hirst, P. Homeier, D. Horton, A.J. Hosseinzadeh, G. Hu, L. Hunkeler, J.S. Ivezić, Ž. Jain, A. Jenness, T. Kanarek, G. Kendrew, S. Kern, N.S. Kerzendorf, W.E. King, J. Kirkby, D. Kulkarni, A.M. Kumar, A. Lee, A. Lenz, D. Littlefair, S.P. Ma, Z. Macleod, D.M. Mastropietro, M. McCully, C. Montagnac, S. Morris, B.M. Mueller, M. Mumford, S.J. Muna, D. Murphy, N.A. Nelson, S. Nguyen, G.H. Ninan, J.P. Nöthe, M. Ogaz, S. Oh, S. Parejko, J.K. Parley, N. Pascual, S. Patil, A.A. Plunkett, A.L. Prochaska, J.X. Janga, V. Reddy Sabater, J. Sakurikar, P. Sherbert, L.E. Shih, A.Y. Sick, J. Singanamalla, S. Singer, L.P. Sladen, P.H. Streicher, O. Teuben, P. Thomas, S.W. Tremblay, G.R. Turner, J.E.H. Terrón, V. van Kerkwijk, M.H. de la Vega, A. Watkins, L.L. Weaver, B.A. Whitmore, J.B. Woillez, J. Department of Astrophysical Sciences Princeton University PrincetonNJ08544 United States Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology 70 Vassar St. CambridgeMA02139 United States Space Telescope Science Institute 3700 San Martin Dr. BaltimoreMD21218 United States South African Astronomical Observatory PO Box 9 Observatory Cape Town7935 South Africa Univ Lyon Univ Lyon1 Ens de Lyon CNRS Centre de Recherche Astrophysique de Lyon UMR5574 Saint-Genis-LavalF-69230 France Caltech/IPAC 1200 E. California Blvd PasadenaCA91125 United States Department of Physics and Astronomy Minnesota State University Moorhead 1104 7th Ave S MoorheadMN56563 United States National Radio Astronomy Observatory 1003 Lopezville Rd SocorroNM87801 United States eScience Institute University of Washington 3910 15th Ave NE SeattleWA98195 United States University College London/Research IT Services Gower St LondonWC1E 6BT United Kingdom Astrochemistry Laboratory NASA Goddard Space Flight Center 8800 Greenbelt Road GreenbeltMD20771 United States Harvard-Smithsonian Center for Astrophysics 60 Garden St. CambridgeMA02138 United States Department of Physics and Astronomy Hunter College City University of New York 695 Park Avenue New YorkNY10065 United States Physics Graduate Center of the City University of New York New YorkNY United States Department of Astrophysics American Museum of Natural History New YorkNY United States Aperio Software Ltd. Headingley Enterprise and Arts Centre Bennett Road LeedsLS6 3HN United Kingdom Department of Physics & Astronomy University of Western Ontario 1151 Richmond St LondonONN5X4H1 Canada Department of Theoretical Physics & Astrophysics Masaryk University Kotlarska 2 Brno61137 Czech Republic INAF-Osservatorio Astronomico di Cagliari via della Scienza 5 SelargiusI-09047 Italy School of Physics & Astronomy University of Nottingham University Park NottinghamNG7 2RD Unit

The Astropy project supports and fosters the development of open-source and openly-developed Python packages that provide commonly-needed functionality to the astronomical community. A key element of the Astropy project is the core package astropy, which serves as the foundation for more specialized projects and packages. In this article, we provide an overview of the organization of the Astropy project and summarize key features in the core package as of the recent major release, version 2.0. We then describe the project infrastructure designed to facilitate and support development for a broader ecosystem of inter-operable packages. We conclude with a future outlook of planned new features and directions for the broader Astropy project. Copyright © 2018, The Authors. All rights reserved.

关键词： Astrophysics

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Future challenges and unsolved problems in multi-field visualization

Mathematics and Visualization

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Mathematics and Visualization 2014年 37卷 205-211页

作者： Laramee, Robert S. Carr, Hamish Chen, Min Hauser, Helwig Linsen, Lars Mueller, Klaus Natarajan, Vijay Obermaier, Harald Peikert, Ronald Zhang, Eugene Computer Science Department Swansea University Swansea United Kingdom University of Leeds Leeds United Kingdom Oxford e-Research Centre University of Oxford OxfordOX1 3QG United Kingdom Department of Informatics University of Bergen Bergen Norway School of Engineering and Science Jacobs University Bremen Germany Department of Computer Science Stony Brook University Stony BrookNY United States Department of Computer Science and Automation IIS Bengaluru India Department of Computer Science UC Davis DavisCA United States ETH Zurich Scientific Visualization Group Zurich Switzerland Oregon State University Corvallis United States

Evaluation, solved and unsolved problems, and future directions are popular themes pervading the visualization community over the last decade. The top unsolved problem in both scientific and information visualization was the subject of an IEEE Visualization Conference panel in 2004. The future of graphics hardware was another important topic of discussion the same year. The subject of how to evaluate visualization returned a few years later. Chris Johnson published a list of 10 top problems in scientific visualization research. This was followed up by report of both past achievements and future challenges in visualization research as well as financial support recommendations to the National science Foundation (NSF) and National Institute of Health (NIH). Chen recently published the first list of top unsolved information visualization problems. Future research directions of topology-based visualization was also a major theme of a workshop on topology-based methods. Laramee and Kosara published a list of top future challenges in human-centered visualization. © Springer-Verlag London 2014.

关键词： Visualization

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Coordinate frame free Dubins vehicle circumnavigation

Coordinate frame free Dubins vehicle circumnavigation

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2014 American Control Conference, ACC 2014

作者： Milutinović, Dejan Casbeer, David Cao, Yongcan Kingston, Derek Computer Engineering Department UC Santa Cruz CA 95060 United States Control Science Center of Excellence Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States

ISBN: (纸本)9781479932726

A Dubins vehicle circumnavigation controller is derived based on an analysis of state space dynamics resulting from a state transformation. The controller is designed and analyzed in the state space with two continuous and one discrete variables. We showed that the property of our control strategy can be studied based on 2D phase portraits, including the case when the vehicle turning rate is bounded. As a part of our analysis, we found conditions that need to be satisfied for the controller to work and that can be used for gain scheduling and application of the control to a larger range bound. The results are illustrated by 2D phase portraits and simulations describing the control implementation, which is based only on range measurements. © 2014 American Automatic Control Council.

关键词： Controllers

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Leveraging social connections to improve personalized ranking for collaborative filtering 14

Leveraging social connections to improve personalized rankin...

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23rd ACM International Conference on Information and Knowledge Management, CIKM 2014

作者： Zhao, Tong McAuley, Julian King, Irwin Shenzhen Key Laboratory of Rich Media Big Data Analytics and Applications Shenzhen Research Institute Chinese University of Hong Kong Shenzhen China Department of Computer Science and Engineering Chinese University of Hong Kong Shatin N.T. Hong Kong Department of Computer Science and Engineering UC San Diego San DiegoCA United States

ISBN: (纸本)9781450325981

Recommending products to users means estimating their preferences for certain items over others. This can be cast either as a problem of estimating the rating that each user will give to each item, or as a problem of estimating users' relative preferences in the form of a ranking. Although collaborative-filtering approaches can be used to identify users who rate and rank products similarly, another source of data that informs us about users' preferences is their set of social connections. Both rating- and ranking-based paradigms are important in real-world recommendation settings, though rankings are especially important in settings where explicit feedback in the form of a numerical rating may not be available. Although many existing works have studied how social connections can be used to build better models for rating prediction, few have used social connections as a means to derive more accurate ranking-based models. Using social connections to better estimate users' rankings of products is the task we consider in this paper. We develop a model, SBPR (Social Bayesian Personalized Ranking), based on the simple observation that users tend to assign higher ranks to items that their friends prefer. We perform experiments on four real-world recommendation data sets, and show that SBPR outperforms alternatives in ranking prediction both in warm- and cold-start settings. Copyright 2014 ACM.

关键词： Collaborative filtering

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