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International Conference on Information and Communication technology for the Muslim World (ICT4M)

作者： Akhlaq Ahmad Md. Abdur Rahman Imad Afyouni Faizan Ur Rehman Bilal Sadiq Mohamed Ridza Wahiddin College of Engineering and Islamic Architecture Umm Al-Qura University Makkah Saudi Arabia Kulliyyah of Information and Communication Technology International Islamic University Kuala Lumpur Malaysia College of Computer and Information Systems Umm Al-Qura University Makkah Saudi Arabia KACST GIS Technology Innovation Center Umm Al-Qura University Makkah KSA Dept. of Computer Science LTG. Universitv of Grenoble Alpes France

Capturing users' spatio-temporal context by recognizing their interests, locations, history and activities, and thereafter providing context-aware services is a challenging task. In this paper, we propose a spatio-temporal zoning model that takes different context dimensions into account and try to recommend necessary services to users in a personalized way. First, we propose a generic zoning model with unrestricted set of contexts where both spatial and temporal dimensions are relaxed, followed by two semi-restricted zoning models in which either spatial or temporal dimension is relaxed, while the other one is restricted. Finally, we show the model requiring restricted spatio-temporal zoning that applies to the scenario where millions of users need to perform some activities that have to be performed in a certain location and at a certain temporal period. We use the above zoning model for Hajj and Umrah events to define pilgrim's spatio-temporal contexts by capturing their real-time and historic activities through their smartphones' sensory data. This allows to intelligently recommend a set of necessary services to the users. We present a few of the implementations introduced in our proposed system.

关键词： Decision support systems

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Back Cover: Resistive Switching Nanodevices Based on Metal–Organic Frameworks (ChemNanoMat 1/2016)

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ChemNanoMat 2015年第1期2卷

作者： Zhengbang Wang David Nminibapiel Pragya Shrestha Jianxi Liu Wei Guo Peter G. Weidler Helmut Baumgart Christof Wöll Engelbert Redel Department Institute of Functional Interfaces Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 B330 76344 Eggenstein-Leopoldshafen Germany Semiconductor and Dimensional Metrology Division National Institute of Standard and Technology (NIST) 100 Bureau Drive Gaithersburg Maryland 20899 USA Dept. Electrical and Computer Engineering Old Dominion University Norfolk Virginia 23529 USA Applied Research Center Newport News Thomas Jefferson Natl. Accelerator Lab Virginia 23606 USA

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Direct digital control of an efficient silicon+liquid crystal phase shifter

Direct digital control of an efficient silicon+liquid crysta...

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IEEE International Conference on Group IV Photonics

作者： Yufei Xing Thomas Ako John P. George Dietmar Korn Hui Yu Peter Verheyen Marianna Pantouvaki Guy Lepage Philippe Absil Christian Koos Juerg Leuthold Jeroen Beeckman Wim Bogaerts Center of Nano-and Biophotonics (NB-photonics) Gent Belgium Dept. of Electrical and Computer Engineering National University of Singapore Singapore Karlsruhe Institute of Technology (KIT) Institutes IPQ and IMT Karlsruhe Germany Department of Information Science and Electronic Engineering Zhejiang University Hangzhou China IMEC vzw Leuven Belgium Electromagnetic Fields Laboratory Swiss Federal Institute of Technology (ETH) Zurich Switzerland Luceda Photonics Dendermonde Belgium

ISBN: (纸本)9781479922840

We demonstrate a phase shifter based on a silicon slot waveguide infiltrated with liquid crystal. We achieve a phase shift of 73 π for a 5V drive voltage, with a voltage-length product of 0.022V·mm around 1V. We can drive the phase shifter directly with a 1V, duobinary pulse-width-modulated signal, allowing direct digital CMOS control of an analog optical phase shifter.

关键词： Phase shifters Switches Phase modulation Pulse width modulation Optical waveguides

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Resolving Braess's paradox in random networks

Resolving Braess's paradox in random networks

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9th International Conference on Web and Internet Economics, WINE 2013

作者： Fotakis, Dimitris Kaporis, Alexis C. Lianeas, Thanasis Spirakis, Paul G. Electrical and Computer Engineering National Technical University of Athens Greece Information and Communication Systems Dept. University of the Aegean Samos Greece Department of Computer Science University of Liverpool United Kingdom Computer Technology Institute and Press - Diophantus Patras Greece

ISBN: (纸本)9783642450457

Braess's paradox states that removing a part of a network may improve the players' latency at equilibrium. In this work, we study the approximability of the best subnetwork problem for the class of random Gn,p instances proven prone to Braess's paradox by (Roughgarden and Valiant, RSA 2010) and (Chung and Young, WINE 2010). Our main contribution is a polynomial-time approximation-preserving reduction of the best subnetwork problem for such instances to the corresponding problem in a simplified network where all neighbors of s and t are directly connected by 0 latency edges. Building on this, we obtain an approximation scheme that for any constant Ε > 0 and with high probability, computes a subnetwork and an Ε-Nash flow with maximum latency at most (1 + Ε)L* + Ε, where L* is the equilibrium latency of the best subnetwork. Our approximation scheme runs in polynomial time if the random network has average degree O(poly(ln n)) and the traffic rate is O(poly(ln ln n)), and in quasipolynomial time for average degrees up to o(n) and traffic rates of O(poly(ln n)). © 2013 Springer-Verlag.

关键词： Polynomial approximation

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Guide query in social networks

Guide query in social networks

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14th International Conference on Web-Age Information Management, WAIM 2013

作者： Lin, Yu-Chieh Yu, Philip S. Chen, Ming-Syan Dept. of Electrical Engineering National Taiwan University Taipei Taiwan Dept. of Computer Science University of Illinois at Chicago Chicago IL United States Research Center for Information Technology Innovation Academia Sinica Taipei Taiwan

ISBN: (纸本)9783642385612

In this paper, we study a new problem of social guide query, which is to find the most informative neighboring nodes of the query node considering the given requirements. After the target nodes are identified, instead of directly providing information of the target nodes, we would like to find the querier's friends who are targets or who can introduce the querier to some targets. To answer the social guide query, we define InfScore based on an existing model of influence diffusion. In addition, we define DivScore that can be integrated in the ranking process to appreciate the diversity of possibly accessible target nodes. To evaluate the guide query, we develop a prototype system using the coauthor network of DBLP computer science bibliography. The results show that the guide query is practical, which can provide valuable answers efficiently. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Query processing

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High resolution fluorescence-based temperature sensor for stand-off detection in physiological range

High resolution fluorescence-based temperature sensor for st...

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12th IEEE SENSORS 2013 Conference

作者： Kuester, Timothy Robucci, Ryan Lam, Hung Rao, Govind Kostov, Yordan Dept. Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD United States Center for Advanced Sensor Technology Dept. of Chem. Biochem and Env. Engineering University of Maryland Baltimore County Baltimore MD United States

ISBN: (纸本)9781467346405

Fluorescence ratiometric temperature sensing system for stand-off temperature measurements in the physiological range is presented. It is based on the use of fluorescence dyes and an integrating photodetector system. The system is intended for use in neonatal intensive care units (NICU). It utilizes a measurement and a reference fluorescence dyes encapsulated in a film. Fluorescence is excited using LEDs and the emission is detected using photodiodes equipped with optical band pass filters. The current generated by the photodiodes is integrated and the charge is digitized. The fluorescence intensity is calculated as the difference in the measured intensities when the LED is on or off. The ratio of the two emission intensities depends linearly on the temperature. The system operates under room-light illumination with resolution

关键词： Fluorescence

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High-Temperature Characterization and Comparison of 1.2 kV SiC Power MOSFETs

High-Temperature Characterization and Comparison of 1.2 kV S...

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IEEE Energy Conversion Congress and Exposition

作者： Christina DiMarino Zheng Chen Milisav Danilovic Dushan Boroyevich Rolando Burgos Paolo Mattavelli Center for Power Electronics Systems Virginia Tech Dept. of Electrical and Computer Engineering Blacksburg USA

ISBN: (纸本)9781479903375

The aim of this work is to characterize and compare the high-temperature performances of the latest generation 1.2 kV Silicon Carbide (SiC) MOSFETs from three well-known manufacturers: Cree, ROHM, and GE. A complete static characterization is performed from 25 ℃ to 200 ℃, including threshold voltage, specific on-resistance, leakage current, junction capacitances, and internal gate resistance. The dynamic performance of each device is evaluated through double-pulse tests conducted from 25 ℃ to 200 ℃. From these double-pulse tests, the switching losses are computed.

关键词： High-Temperature Characterization switching losses dynamic performance Switching losses dynamic characteristics Pulsus bisferiens SILICON CARBIDE high temperature threshold voltage

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Friend recommendation based on the Luscher color theory: Twitter use case

Friend recommendation based on the Luscher color theory: Twi...

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IEEE International Conference on Telecommunications and Malaysia Communications (ICT-MICC)

作者： M. S. Tajbakhsh M. P. Aghababa V. Solouk A. Akbari-Moghanjoughi Dept. Electrical Engineering - IT & Computer Engineering Urmia University of Technology Urmia Iran Dept. of Computer & Communication Systems Engineering Universiti Putra Malaysia Selangor Malaysia

At the area of information technology, social networks are becoming an unavoidable part of the Internet usage, due to their facilities for users as well as the benefits to the providers. However, the popularity and thereby, the success of social networks depends highly on number of the network members. This in turn, depends on considerations for several criteria such as networking and number of networks. On the other hand, it is believed that suggestion of appropriate friends to members performed by an effective recommender system can lead to suitable content ranking and consequently, impact the growth of the network in significant sense. The current paper introduces a novel method of recommending celebrities in a social network based on genetic algorithm and the concept of color psychology. The proposed method is applied to Twitter social network as case study, through which the cost function of the user is first optimized to achieve the ideal weights, and the celebrities are then ranked based on the specified parameters as follower and following counts, background color and description. The system is tested using real data of celebrities and number of 100 users with identical parameters. The results evidence the closest recommendation in terms of affordable recommendation error rates as low as 7.6% based on the psychological data validation.

关键词： Color Twitter Conferences Image color analysis Recommender systems Business

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An active power control system for wind turbines capable of primary and secondary frequency control for supporting grid reliability

An active power control system for wind turbines capable of ...

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51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

作者： Aho, Jacob Buckspan, Andrew Pao, Lucy Fleming, Paul University of Colorado Boulder Dept. of Electrical Computer and Energy Engineering CU Boulde Boulder CO United States National Renewable Energy Laboratory National Wind Technology Center Golden CO United States

ISBN: (纸本)9781624101816

Wind energy is producing a larger share of power on many utility grids as more wind turbines are installed, providing motivation for wind turbines to provide ancillary services that are necessary for power grid reliability. The ancillary services considered in this paper consist of actively controlling the power output of the wind turbines to track power set-point commands, participate in frequency regulation, and provide frequency response. This paper focuses on the development of a wind turbine control system that is capable of varying the turbine's active power output upon receiving de-rating power set-point commands, manual power commands, and automatic frequency regulation commands to meet the system operators' needs in below-rated and above-rated wind speeds. The turbine is de-rated by operating at a higher than optimal tip speed ratio, storing additional inertia in the rotor, which can be used to assist in frequency regulation by providing a primary response to fluctuations in the grid frequency. © 2013 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Wind turbines

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First simultaneous observations of optical lightning and terrestrial gamma flash from space

First simultaneous observations of optical lightning and ter...

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General Assembly and Scientific Symposium, URSI

作者： Nikolai Østgaard Thomas Gjesteland Brant E. Carlson Andrew B. Collier Steve A. Cummer Gaopeng Lu Hugh Christian Dept. of Physics and Technology University of Bergen Bergen Norway Universitetet i Bergen Bergen Hordaland NO School of Chemistry and Physics University of KwaZulu-Natal Durban South Africa Electrical and Computer Engineering Department Duke University North Carolina USA Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO) Chinese Academy of Sciences Beijing China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing China University of Hunstville Alabama USA

In this paper we present the very first simultaneous detection of a terrestrial gamma-ray flash (TGF) and the optical signal from lightning. By fortuitous coincidence two independent satellites passed less than 300 km from the thunderstorm system that produced a TGF that lasted 70 μs. Together with two independent measurements of radio emissions we have an unprecedented coverage of the event. We find that the TGF was produced inside the thundercloud at the initial stage of an intracloud (IC) lightning just before the leader reached the cloud top and extended horizontally. A strong radio pulse was produced by the TGF itself. This is the first time the sequence of radio pulses, TGF and optical emissions has been identified. Figure 1 shows the three data sets and illustrates our interpretation of this unique event.

关键词： Educational institutions Integrated optics Optical pulses Lightning Stimulated emission Gamma-rays

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