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arXiv 2021年

作者： Miao, B. Shrock, J.E. Feder, L. Hollinger, R.C. Morrison, J. Nedbailo, R. Picksley, A. Song, H. Wang, S. Rocca, J.J. Milchberg, Howard M. Institute for Research in Electronics and Applied Physics Dept. of Physics University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering Colorado State University Fort CollinsCO80523 United States John Adams Institute for Accelerator Science Department of Physics University of Oxford OX1 3RH United Kingdom Physics Department Colorado State University Fort CollinsCO80523 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States

We present the first demonstration of multi-GeV laser wakefield acceleration in a fully optically formed plasma waveguide, with an acceleration gradient as high as 25 GeV/m. The guide was formed via self-waveguiding of e0 = (1.3 − 3.2) × 1017 cm−3. We find that shot-to-shot stability of bunch spectra and charge are strongly dependent on the pointing of the injected laser pulse and gas jet uniformity. We also observe evidence of pump depletion-induced dephasing, a consequence of the long optical guiding distance. © 2021, CC BY-NC-ND.

关键词： Germanium alloys

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Dynamic load balancing in heterogeneous computing systems with central-server node model 31

Dynamic load balancing in heterogeneous computing systems wi...

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31st International Conference on computer Applications in Industry and Engineering, CAINE 2018

作者： Penmatsa, Satish Hura, Gurdeep S. Dept. of Computer Science Framingham State University FraminghamMA United States Dept. of Math. and Computer Science University of Maryland Eastern Shore Princess AnneMD United States

ISBN: (纸本)9781943436125

Heterogeneous computing systems may comprise of computing resources with varying service rates and work loads. The performance of these systems can be improved by proper load balancing of the jobs in the system among the computing resources. In this paper, we present a dynamic load balancing scheme whose objectives are to minimize the execution time of jobs in the system and to provide fairness to the users of jobs. The computing resources are modeled as central-server nodes with one processor and one or more input/output devices. Simulations are conducted with various heterogeneous system configurations to evaluate the performance of the presented dynamic load balancing scheme. © 31st International Conference on computer Applications in Industry and Engineering, CAINE 2018. All rights reserved.

关键词： Balancing

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Application of a Closed-Form Solution to Directional Ocean Wave Spectrum Extraction from HF-Radar Field Data

Application of a Closed-Form Solution to Directional Ocean W...

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OCEANS - Europe

作者： Reza Shahidi Eric W. Gill Dept. of Electrical and Computer Engineering Faculty of Engineering and Applied Science Memorial University St. John’s NL Canada

In [1], an efficient algorithm was presented for non-directional ocean wave spectrum extraction from HF-radar data. In that paper, the method was tested on synthetically-generated Doppler spectra, and was found to perform well, even in the presence of noise. In the current paper, the method from [1] is slightly modified and shown to be able to extract directional wave spectra effectively from HF-radar field data acquired in Argentia, Newfoundland, Canada.

关键词： Data mining Doppler effect Ocean waves Sea measurements Doppler radar Oceans

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On the relationship between the centroid and the footprint of uncertainty of Interval Type-2 fuzzy numbers

On the relationship between the centroid and the footprint o...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Juan Carlos Figueroa-García Roman Neruda Yurilev Chalco-Cano Heriberto Román-Flores Assistant Professor of the Engineering Dept. Universidad Distrital Distrital Francisco José de Caldas Bogotá Colombia Assistant Professor of the Institute of Computer Science of the Czech Academy of Sciences Prague Czech Republic professor of the Math. Dept. Universidad de Tarapacá Arica Chile professor of the Instituto de Alta Investigación of Universidad de Tarapacá Arica Chile

ISBN: (数字)9781728169323

ISBN: (纸本)9781728169330

This paper presents experimental results about the relationship between the Footprint Of Uncertainty (FOU) and the centroid of Interval Type-2 Fuzzy Numbers (IT2FN) which are a subclass of Type-2 fuzzy numbers. Four types of IT2FNs are analyzed: singleton-core triangular, interval-core triangular, singleton-core Gaussian and interval-core Gaussian IT2FNs. A quadratic relationship was detected, characterized, and their results are presented and discussed using numerical experiments.

关键词： Fuzzy sets Uncertainty Measurement uncertainty Electronic mail Indexes Fuzzy control Optimization

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Achieving Ultra Energy-efficient and Collision-free Data Collection in Wake-up Radio Enabled mIoT

Achieving Ultra Energy-efficient and Collision-free Data Col...

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IEEE International Conference on Communications (ICC)

作者： Chia-An Hsu Frank Y. Li Chiuyuan Chen Yu-Chee Tseng Department of Applied Mathematics National Chiao Tung University Hsinchu R.O.C. Taiwan Dept. of Information and Communication Technology University of Agder (UiA) Grimstad Norway Department of Computer Science National Chiao Tung University Hsinchu R.O.C. Taiwan

ISBN: (数字)9781728150895

ISBN: (纸本)9781728150901

To achieve ultra-low energy consumption and decade-long battery lifetime for Internet of things (IoT) networks, wake-up radio (WuR) appears as an eminent solution. While keeping devices in deep sleep for most of the time, a WuR enabled IoT device can be woken up for data transmission at any time by a wake-up call (WuC). However, collisions happen among WuCs for transmitter-initiated data reporting and among data packets for receiver-initiated data collection. In this paper, we propose two novel hashing-based schemes in order to achieve collision-free data transmissions for receiver-initiated data collection. We consider first a simple scenario in which all devices in a region of interest are covered by a data collector and propose a scheme which facilitates a scheduled time for data uploading of each device. Then we extend our scheme to cover a more realistic scenario where IoT devices are distributed across a larger region that cannot be covered by a single data collector. In this case, we propose a partitioning algorithm for data collection across multiple partitions. Both analysis and simulations are performed to demonstrate the effectiveness of the proposed schemes.

关键词： Data collection Radio frequency Energy consumption Silicon Internet of Things Data communication Unmanned aerial vehicles

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Enhancing seasonal fire predictions with hybrid dynamical and random forest models

npj Natural Hazards

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npj Natural Hazards 2025年第1期2卷 1-10页

作者： Miguel Ángel Torres-Vázquez Andrina Gincheva Juan Pedro Montávez Marco Turco Sixto Herrera Amar Halifa-Marín Leone Cavicchia Francesca Di Giuseppe Regional Atmospheric Modelling (MAR) Group Department of Physics Regional Campus of International Excellence Campus Mare Nostrum (CEIR) University of Murcia Murcia Spain Dept. of Applied Mathematics and Computer Science Universidad de Cantabria Santander Spain Instituto Pirenaico de Ecología Consejo Superior de Investigaciones Científicas (IPE–CSIC) Zaragoza Spain CMCC Foundation—Euro-Mediterranean Center on Climate Change Lecce Italy European Centre for Medium-range Weather Forecasts (ECMWF) Reading UK

This study presents an innovative approach to forecasting seasonal anomalies in burned areas (BA) by integrating process-based seasonal prediction and a random forest climate-fire model. The Standardized Precipitation Index (SPI), derived from observed precipitation, allows us to predict burned area anomalies a month before the start of the target fire season in ~68% of the burnable area. When utilizing seasonal predictions, the system maintains skillful results in ~46% of the burnable area. Given the availability of observational and forecast data in near-real-time, a prototype operational forecast for burned areas could be provided to enhance climate services.

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Slow steady rotation of a spheroid in an incompressible micropolar fluid under Stokesian assumption

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AIP Conference Proceedings 2023年第1期2707卷

作者： Leela Santi Parige D. Sateesh Kumar Asra Anjum Department of Engineering Mathematics College of Engineering Koneru Lakshmaiah Education Foundation Vaddeswaram Guntur AP India Dept. of Mathematics and Statistics Bhavan’s Vivekananda College of Science Humanities and Commerce Sainikpuri Secunderabad-500094 India College of computing (IT Department Math-Section) University of Technology and Applied sciences-Salalah Dhofar Governate Sultanate of Oman Postal code 211 P.O Box no: 608 Oman

We study the rotation of a spheroid in an incompressible micro polar fluid. Here we consider stokesian approximation for the fluid. The expressions of velocity and pressure fields are obtained in Legendre and associated Legendre functions. Redial and angular spheroidal functions are also used in solving velocity and pressure. Finally obtain the drag experienced the spheroid. Numerically studied the behavior of the drag with respect to the flow parameters display the results in the table.

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Assessing Human Judgment Forecasts in the Rapid Spread of the Mpox Outbreak: Insights and Challenges for Pandemic Preparedness

arXiv

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arXiv 2024年

作者： McAndrew, Thomas Majumder, Maimuna S. Lover, Andrew A. Venkatramanan, Srini Bocchini, Paolo Besiroglu, Tamay Codi, Allison Dempsey, Gaia Abbott, Sam Chevalier, Sylvain Bosse, Nikos I. Cambeiro, Juan Braun, David Department of Community and Population Health College of Health Lehigh University BethlehemPA United States Boston Children's Hospital BostonMA United States Harvard Medical School BostonMA United States Dept. of Biostatistics and Epidemiology School of Public Health and Health Sciences University of Massachusetts Amherst AmherstMA United States Biocomplexity Institute and Initiative University of Virginia CharlottesvilleVA United States Department of Civil and Environmental Engineering P.C. Rossin College of Engineering and Applied Science Lehigh University BethlehemPA United States MIT Computer Science and Artificial Intelligence Laboratory CambridgeMA United States Metaculus Santa CruzCA United States Department of Biostatistics Rollins School of Public Health Emory University AtlantaGA United States Centre for Mathematical Modelling of Infectious Diseases London School of Hygiene & Tropical Medicine Keppel St LondonWC1E 7HT United Kingdom Department of Epidemiology Mailman School of Public Health Columbia University New York United States Department of Psychology Lehigh University BethlehemPA United States

In May 2022, mpox (formerly monkeypox) spread to non-endemic countries rapidly. Human judgment is a forecasting approach that has been sparsely evaluated during the beginning of an outbreak. We collected-between May 19, 2022 and July 31, 2022-1275 forecasts from 442 individuals of six questions about the mpox outbreak where ground truth data are now available. Individual human judgment forecasts and an equally weighted ensemble were evaluated, as well as compared to a random walk, autoregressive, and doubling time model. We found (1) individual human judgment forecasts underestimated outbreak size, (2) the ensemble forecast median moved closer to the ground truth over time but uncertainty around the median did not appreciably decrease, and (3) compared to computational models, for 2-8 week ahead forecasts, the human judgment ensemble outperformed all three models when using median absolute error and weighted interval score;for one week ahead forecasts a random walk outperformed human judgment. We propose two possible explanations: at the time a forecast was submitted, the mode was correlated with the most recent (and smaller) observation that would eventually determine ground truth. Several forecasts were solicited on a logarithmic scale which may have caused humans to generate forecasts with unintended, large uncertainty intervals. To aide in outbreak preparedness, platforms that solicit human judgment forecasts may wish to assess whether specifying a forecast on logarithmic scale matches an individual's intended forecast, support human judgment by finding cues that are typically used to build forecasts, and, to improve performance, tailor their platform to allow forecasters to assign zero probability to events. © 2024, CC BY.

关键词： Forecasting

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Time threshold for classification between 2D-touch and 3D-touch based on user's 3D-touch input 8

Time threshold for classification between 2D-touch and 3D-to...

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2018 8th International Workshop on computer science and Engineering, WCSE 2018

作者： Park, JinHyuck Nam, ChoonSung Lee, JangYeol Seo, Young Hoon Shin, DongRyeol Dept. Electric and Electrical Computer Engineering SungKyunKwan University Suwon Korea Republic of Dept. Applied Data Science SungKyunKwan University Suwon Korea Republic of

ISBN: (纸本)9789811178610

As 3D-Touch technology has recently developed, 3D-Touch technology, which was applied only to the touch display of mobile devices, has been introduced to various devices. Although many researches have proposed applying the 3D-Touch technology to various devices, these researches have been confined only to apply 3D-Touch technology without considering 2D-Touch technology. Therefore, there is no clear criterion for distinguishing between 2D-Touch and 3D-Touch. In this paper, we suggest a time threshold for distinguishing between 2D-Touch and 3D-Touch on a display that supports 3D-Touch. © Proceedings of 2018 the 8th International Workshop on computer science and Engineering, WCSE 2018. All rights reserved.

关键词： Three dimensional displays

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Wireless sensor network for in situ soil moisture monitoring

arXiv

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arXiv 2021年

作者： Fang, Jianing Hu, Chuheng Smaoui, Nour Carlson, Doug Gupchup, Jayant Musaloiu, Razvan E. Liang, Chieh-Jan Mike Chang, Marcus Gnawali, Omprakash Budavari, Tamas Terzis, Andreas Szlavecz, Katalin Szalay, Alexander S. Department of Earth & Planetary Sciences Johns Hopkins University 3400 N Charles Street Baltimore United States Department of Computer Science Johns Hopkins University 3400 N Charles Street Baltimore United States Department of Computer Science University of Houston 4800 Calhoun Rd HoustonHouston United States CEVA Inc. 15245 Shady Grove Rd Rockville United States Microsoft Corporation One Microsoft Way Redmond United States Microsoft Research No. 5 Danling Street Beijing China Arm Ltd. 5707 Southwest Pkwy 100 Austin United States Department of Applied Mathematics & Statistics Johns Hopkins University 3400 N Charles Street Baltimore United States Dept. of Computer Science and Physics & Astronomy Johns Hopkins University 3400 N Charles Street Baltimore United States

We discuss the history and lessons learned from a series of deployments of environmental sensors measuring soil parameters and CO2 fluxes over the last fifteen years, in an outdoor environment. We present the hardware and software architecture of our current Gen-3 system, and then discuss how we are simplifying the user facing part of the software, to make it easier and friendlier for the environmental scientist to be in full control of the system. Finally, we describe the current effort to build a large-scale Gen-4 sensing platform consisting of hundreds of nodes to track the environmental parameters for urban green spaces in Baltimore, Maryland. © 2021, CC BY.

关键词： Wireless sensor networks

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