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IEEE Global Communications Conference

作者： Behrooz Makki Tommy Svensson Thomas Eriksson Mohamed-Slim Alouini Department of Signals and Systems Chalmers University of Technology Computer Electrical and Mathematical Science and Engineering Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781479959532

This paper studies the performance of the hybrid radio-frequency (RF) and free-space optical (FSO) links assuming perfect channel state information (CSI) at the receiver. Considering the cases with and without hybrid automatic repeat request (HARQ), we derive closed-form expressions for the message decoding probabilities as well as the throughput and the outage probability of the RF-FSO setups. We also evaluate the effect of different channel conditions on the throughput and the outage probability. The results show the efficiency of the RF-FSO links in different conditions.

关键词： HARQ Throughput radiofrequency Receivers

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Two target localization using passive monopulse radar

Two target localization using passive monopulse radar

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IEEE Radar Conference

作者： Seifallah Jardak Sajid Ahmed Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781467396561

The simultaneous lobing technique, also known as monopulse technique, has been widely used for fast target localization and tracking purposes. Many works focused on accurately localizing one or two targets laying within a narrow beam centered around the monopulse antenna boresight direction. In this work, however, a new approach uses the outputs of a four quadrant antenna receiver to rapidly localize two point targets present in the hemisphere. A second set of antennas can be required to localize two targets sharing the same elevation or azimuth angles. To combine the outputs of both antenna sets and enhance the estimation performance of the algorithm, two methods are presented and compared.

关键词： Radar Receiving antennas Estimation Radar antennas Azimuth

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Publisher Correction: A robotic multidimensional directed evolution approach applied to fluorescent voltage reporters

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Nature chemical biology 2018年第9期14卷 901-901页

作者： Kiryl D Piatkevich Erica E Jung Christoph Straub Changyang Linghu Demian Park HoJun Suk Daniel R Hochbaum Daniel Goodwin Eftychios Pnevmatikakis Nikita Pak Takashi Kawashima ChaoTsung Yang Jeffrey L Rhoades Or Shemesh Shoh Asano YoungGyu Yoon Limor Freifeld Jessica L Saulnier Clemens Riegler Florian Engert Thom Hughes Mikhail Drobizhev Balint Szabo Misha B Ahrens Steven W Flavell Bernardo L Sabatini Edward S Boyden Media Lab Massachusetts Institute of Technology (MIT) Cambridge MA USA. Howard Hughes Medical Institute Department of Neurobiology Harvard Medical School Boston MA USA. Department of Electrical Engineering and Computer Science MIT Cambridge MA USA. Harvard-MIT Division of Health Sciences and Technology MIT Cambridge MA USA. Simons Center Data Analysis Simons Foundation New York NY USA. Department of Mechanical Engineering MIT Cambridge MA USA. Janelia Research Campus Howard Hughes Medical Institute Ashburn Virginia USA. Picower Institute for Learning & Memory and Department of Brain & Cognitive Sciences MIT Cambridge MA USA. Department of Molecular and Cellular Biology and Center for Brain Science Harvard University Cambridge MA USA. Department of Neurobiology Faculty of Life Sciences University of Vienna Wien Austria. Department of Cell Biology and Neuroscience Montana State University Bozeman Montana USA. Department of Biological Physics Eotvos University Budapest Hungary. Media Lab Massachusetts Institute of Technology (MIT) Cambridge MA USA. esb@media.mit.edu. Department of Biological Engineering MIT Cambridge MA USA. esb@media.mit.edu. MIT Center for Neurobiological Engineering MIT Cambridge MA USA. esb@media.mit.edu. Department of Brain and Cognitive Sciences MIT Cambridge MA USA. esb@media.mit.edu. MIT McGovern Institute for Brain Research MIT Cambridge MA USA. esb@media.mit.edu.

In the version of this article originally published, the bottom of Figure 4f,g was partially truncated in the PDF. The error has been corrected in the PDF version of this article.

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Silicon Nanoparticles: Porous Silicon Nanoparticle Delivery of Tandem Peptide Anti‐Infectives for the Treatment ofPseudomonas aeruginosaLung Infections (Adv. Mater. 35/2017)

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Advanced Materials 2017年第35期29卷

作者： Ester J. Kwon Matthew Skalak Alessandro Bertucci Gary Braun Francesco Ricci Erkki Ruoslahti Michael J. Sailor Sangeeta N. Bhatia Koch Institute for Integrative Cancer Research and Harvard‐MIT Division of Health Sciences and Technology Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Chemistry and Biochemistry University of California at San Diego La Jolla CA 92093 USA Dipartimento di Scienze e Tecnologie Chimiche University of Rome Tor Vergata Via della Ricerca Scientifica Rome 00133 Italy Cancer Research Center Sanford Burnham Prebys Medical Discovery Institute La Jolla CA 92037 USA Koch Institute for Integrative Cancer Research Institute for Medical Engineering and Science Harvard‐MIT Division of Health Sciences and Technology Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA Howard Hughes Medical Institute Massachusetts Institute of Technology Cambridge MA 02139 USA

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A First Approach on Fault Detection and Isolation for Cardiovascular Anomalies Detection

A First Approach on Fault Detection and Isolation for Cardio...

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American Control Conference

作者： F. Diaz Ledezma T. M. Laleg-Kirati Mechanical Engineering Department King Abdullah University of Science and Technology Saudi Arabia Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology Saudi Arabia

ISBN: (纸本)9781479917730

In this paper, we use an extended version of the cardiovascular system's state space model presented by [1] and propose a fault detection and isolation methodology to study the problem of detecting cardiovascular anomalies that can originate from variations in physiological parameters and deviations in the performance of the heart's mitral and aortic valves. An observer-based approach is discussed as the basis of the method. The approach contemplates a bank of Extended Kalman Filters to achieve joint estimation of the model's states and parameters and to detect malfunctions in the valves' performance.

关键词： Defect detection Cardiovascular System joint estimation malfunctions Anomalies Extended Kalman filters

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Blind identification strategies for room occupancy estimation

Blind identification strategies for room occupancy estimatio...

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European Control Conference

作者： A. Ebadat G. Bottegal D. Varagnolo B. Wahlberg H. Hjalmarsson K. H. Johansson ACCESS the Department of Automatic Control School of Electrical engineering KTH Royal Institute of Technology Division of Signals and Systems Department of Computer Science Electrical and Space Engineering Lulea University of Innovation and Technology

ISBN: (纸本)9781467371605

We propose and test on real data a two-tier estimation strategy for inferring occupancy levels from measurements of CO_2 concentration and temperature levels. The first tier is a blind identification step, based either on a frequentist Maximum Likelihood method, implemented using non-linear optimization, or on a Bayesian marginal likelihood method, implemented using a dedicated Expectation-Maximization algorithm. The second tier resolves the ambiguity of the unknown multiplicative factor, and returns the final estimate of the occupancy levels. The overall procedure addresses some practical issues of existing occupancy estimation strategies. More specifically, first it does not require the installation of special hardware, since it uses measurements that are typically available in many buildings. Second, it does not require apriori knowledge on the physical parameters of the building, since it performs system identification steps. Third, it does not require pilot data containing measured real occupancy patterns (i.e., physically counting people for some periods, a typically expensive and time consuming step), since the identification steps are blind.

关键词： System identification Management of HVAC systems Maximum Likelihood Expectation-Maximization

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Distributed cloud association in downlink multicloud radio access networks

Distributed cloud association in downlink multicloud radio a...

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Annual Conference on Information sciences and Systems (CISS)

作者： Hayssam Dahrouj Tareq Y. Al-Naffouri Mohamed-Slim Alouini Computer Electrical and Mathematics Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Province Saudi Arabia

This paper considers a multicloud radio access network (M-CRAN), wherein each cloud serves a cluster of base-stations (BS's) which are connected to the clouds through high capacity digital links. The network comprises several remote users, where each user can be connected to one (and only one) cloud. This paper studies the user-to-cloud-assignment problem by maximizing a network-wide utility subject to practical cloud connectivity constraints. The paper solves the problem by using an auction-based iterative algorithm, which can be implemented in a distributed fashion through a reasonable exchange of information between the clouds. The paper further proposes a centralized heuristic algorithm, with low computational complexity. Simulations results show that the proposed algorithms provide appreciable performance improvements as compared to the conventional cloud-less assignment solutions.

关键词： Heuristic algorithms Radio access networks Iterative methods Computational complexity Antennas Optimization Downlink

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A stochastic maximum principle for risk-sensitive mean-field type control

A stochastic maximum principle for risk-sensitive mean-field...

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作者： Djehiche, Boualem Tembine, Hamidou Tempone, Raul Department of Mathematics KTH Royal Institute of Technology Stockholm100 44 Sweden Center for Interdisciplinary Studies in Security and Privacy Electrical and Computer Engineering Polytechnic School of Engineering New York University NY10003 United States Division of Engineering Saadiyat Island New York University Abu Dhabi Abu Dhabi United Arab Emirates SRI Uncertainty Quantification Center in Computational Science and Engineering CEMSE King Abdullah University of Science and Technology Thuwai Jeddah23955-6900 Saudi Arabia

In this paper we study mean-field type control problems with risk-sensitive performance functionals. We establish a stochastic maximum principle (SMP) for optimal control of stochastic differential equations (SDEs) of mean-field type, in which the drift and the diffusion coefficients as well as the performance functional depend not only on the state and the control but also on the mean of the distribution of the state. Our result extends the risk-sensitive SMP (without mean-field coupling) of Lim and Zhou (2005), derived for feedback (or Markov) type optimal controls, to optimal control problems for non-Markovian dynamics which may be time-inconsistent in the sense that the Bellman optimality principle does not hold. In our approach to the risk-sensitive SMP, the smoothness assumption on the value-function imposed in Lim and Zhou (2005) needs not be satisfied. For a general action space a Peng's type SMP is derived, specifying the necessary conditions for optimality. Two examples are carried out to illustrate the proposed risk-sensitive mean-field type SMP under linear stochastic dynamics with exponential quadratic cost function. Explicit solutions are given for both mean-field free and mean-field models. © 1963-2012 IEEE.

关键词： Maximum principle

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Boosting tag-based search in social media sites

Boosting tag-based search in social media sites

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IEEE International Conference on Multimedia and Expo Workshops (ICMEW)

作者： Majdi Rawashdeh Mohammed F. Alhamid M. Anwar Hossain Abdulmotaleb El Saddik Engineering Division New York University Abu Dhabi UAE College of Computer and Information Sciences King Saud University KSA School of Electrical Engineering and Computer Science University of Ottawa Canada

The availability and pervasive use of smart mobile devices makes it easy to upload videos and photos to the social websites and label them with any arbitrary tags from anywhere and anytime. This paper exploits the social tagging information and reveals the latent hidden tags which might be relevant to a social media item to improve the tag-based search process. The proposed approach predicts links in undirected weighted tripartite graph. From a graph-based proximity perspective, our approach finds the appropriate personalized item in response to the user's query as well as uncovers the hidden tags potentially relevant to a given item. We evaluate our method on real-world social tagging system collected from MovieLens. The experimental evaluation shows that enriching the low annotated items with hidden tags improves the tag-based search performance.

关键词： Tagging Matrix converters Media Motion pictures Search problems Mobile handsets Videos

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Critical fields and vortex pinning in overdoped Ba0.2K0.8Fe2As2

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physical Review B 2015年第17期91卷 174512-174512页

作者： B. Shen M. Leroux Y. L. Wang X. Luo V. K. Vlasko-Vlasov A. E. Koshelev Z. L. Xiao U. Welp W. K. Kwok M. P. Smylie A. Snezhko V. Metlushko Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Department of Electrical and Computer Engineering University of Illinois at Chicago Chicago Illinois 60607 USA

We determine the upper and lower critical fields, the penetration depth and the vortex pinning characteristics of single crystals of overdoped Ba0.2K0.8Fe2As2 with Tc∼10K. We find that bulk vortex pinning is weak and vortex dynamics to be dominated by the geometrical surface barrier. The temperature dependence of the lower critical field, Hc1, displays a distinctive upturn at low temperatures, which is suggestive of two distinct superconducting gaps. Furthermore, the penetration depth, λ, varies linearly with temperature below 4 K indicative of line nodes in the superconducting gap. These observations can be well described in a model based on a multiband nodal superconducting gap.

关键词： CRYSTALS SUPERCONDUCTIVITY VECTOR beams ELECTRIC conductivity ANYON superconductivity

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