196,540 research outputs found
Expressiveness within Sequence Datalog
No full textMotivated by old and new applications, we investigate Datalog as a language for sequence databases. We reconsider classical features of Datalog programs, such as negation, recursion, intermediate predicates, and relations of higher arities. We also consider new features that are useful for sequences, notably, equations between path expressions, and "packing". Our goal is to clarify the relative expressiveness of all these different features, in the context of sequences. Towards our goal, we establish a number of redundancy and primitivity results, showing that certain features can, or cannot , be expressed in terms of other features. These results paint a complete picture of the expressiveness relationships among all possible Sequence Datalog fragments that can be formed using the six features that we consider.Heba Aamer is supported by the Special Research Fund (BOF) (BOF19OWB16). Jan Van den Bussche is also partially supported by the National Natural Science Foundations of China (61972455
Potential Operation and Maintenance (O&M) Opportunities at the Florida Department of Highway Safety and Motor Vehicles
No full textThis report summarizes the results of a field trip by Aamer Athar, Dr. Mingsheng Liu of the Energy Systems Laboratory and Mr. Yorg Mager of the University of Florida for identification of O&M opportunities at the Neil Kirkman Buildings. Several O&M opportunities were investigated and savings were estimated. By locking in the fan operation with the chiller all the AHUs could be turned off during the unoccupied hours. The potential annual savings are 8,000/yr. Resetting the cold deck temperature based on outside air temperature and by keeping the chiller on during occupied hours would also save energy and cost
Silicon slow-light-based photonic mixer for microwave-frequencyconversion applications
No full textThis paper was published in OPTICS LETTERS and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OL.37.001721. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law[EN] We describe and demonstrate experimentally a method for photonic mixing of microwave signals by using a silicon electro-optical Mach¿Zehnder modulator enhanced via slow-light propagation. Slow light with a group index of ~11, achieved in a one-dimensional periodic structure, is exploited to improve the upconversion performance of an input frequency signal from 1 to 10.25 GHz. A minimum transmission point is used to successfully demonstrate the upconversion with very low conversion losses of ~7¿¿dB and excellent quality of the received I/Q modulated QPSK signal with an optimum EVM of ~8%.Financial support from FP7-224312 HELIOS project and Generalitat Valenciana under PROMETEO-2010-087 R&D Excellency Program (NANOMET) are acknowledged. F. Y.Gardes, D. J. Thomson, and G. T. Reed are supported by funding received from the UK EPSRC funding body under the grant “UK Silicon Photonics.” The author A. M. Gutiérrez thanks D. Marpaung for his useful
help.Gutiérrez Campo, AM.; Brimont, ACJ.; Herrera Llorente, J.; Aamer, M.; Martí Sendra, J.; Thomson, DJ.; Gardes, FY.... (2012). Silicon slow-light-based photonic mixer for microwave-frequencyconversion applications. Optics Letters. 37(10):1721-1723. https://doi.org/10.1364/OL.37.001721S17211723371
Input-Output Disjointness for Forward Expressions in the Logic of Information Flows
No full textLast year we introduced the logic FLIF (forward logic of information flows) as a declarative language for specifying complex compositions of information sources with limited access patterns. The key insight of this approach is to view a system of information sources as a graph, where the nodes are valuations of variables, so that accesses to information sources can be modeled as edges in the graph. This allows the use of XPath-like navigational graph query languages. Indeed, a well-behaved fragment of FLIF, called io-disjoint FLIF, was shown to be equivalent to the executable fragment of first-order logic. It remained open, however, how io-disjoint FLIF compares to general FLIF . In this paper we close this gap by showing that general FLIF expressions can always be put into io-disjoint form
sj-docx-1-smo-10.1177_20503121211049931 – Supplemental material for Assessment of anti-factor Xa activity in critically ill COVID-19 patients receiving three different anticoagulation regimens
No full textSupplemental material, sj-docx-1-smo-10.1177_20503121211049931 for Assessment of anti-factor Xa activity in critically ill COVID-19 patients receiving three different anticoagulation regimens by Mohammed A Hamad, Shereen A Dasuqi, Aamer Aleem, Rasha A Omran, Rakan M AlQahtani, Fahad A Alhammad and Abdulaziz H Alzeer in SAGE Open Medicine</p
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Slow-Light-Enhanced Silicon Optical Modulators Under Low-Drive-Voltage Operation
No full text[EN] The integration of nanophotonics components with advanced complementary metal-oxide-semiconductor (CMOS) electronics requires drive voltages as low as 1 V for enabling next-generation CMOS electrophotonics transceivers. Slow-light propagation has been recently demonstrated as an effective mechanism to enhance the modulation efficiency in free-carrier-based electrooptical silicon modulators. Here, we exploit the use of slow light to reduce the driving voltage of carrier-depletion-based Mach-Zehnder modulators. The slow-light phase shifter consists of a p-n junction positioned in the middle of a corrugated waveguide. A modulation efficiency as high as V pi L pi similar to 0: 6 V . cm is achieved, thus allowing data transmission rates up to 10 Gb/s with a 1.5-V-pp drive voltage and an insertion loss of similar to 12 dB. The influence of the drive voltage on the modulation speed as well as the variation of the insertion losses with a group index is also analyzed and discussed.© 2009-2012 IEEE.Manuscript received April 24, 2012; revised June 29, 2012; accepted July 2, 2012. Date of current version July 25, 2012. This work was supported by the European Commission under Project HELIOS (photonics electronics functional integration on CMOS), FP7224312, and by the TEC2008-06333 SINADEC and PROMETEO-2010-087 R&D Excellency Program (NANOMET). The work of F. Y. Gardes, D. J. Thomson, and G. T. Reed was supported by the UK Environmental and Physical Sciences Research Council funding body under the grant "UK Silicon Photonics." [Corresponding author: P. Sanchis (e-mail: [email protected]).Brimont, ACJ.; Gutiérrez Campo, AM.; Aamer, M.; Thomson, DJ.; Gardes, FY.; Fedeli, J.; Reed, GT.... (2012). Slow-Light-Enhanced Silicon Optical Modulators Under Low-Drive-Voltage Operation. IEEE Photonics Journal. 4(5):1306-1315. https://doi.org/10.1109/JPHOT.2012.2207884S130613154
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