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IEEE Conference on Vehicular Technology (VTC)

作者： Anlei Rao Mohamed-Slim Alouini Electrical Engineering Division of Physical Sciences and Engineering King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia

Previous works in cooperative spectrum sensing assumed that the channels for sensing and reporting are independent identically distributed (i.i.d). A more practical and appropriate assumption, however, should be that the sensing channels and reporting channels are independent but not necessarily identically distributed (i.n.i.d). In this paper, we derive the false-alarm probability and the detection probability of cooperative spectrum sensing with energy fusion over i.n.i.d Nakagami fading channels. Selected numerical results show that cooperative spectrum sensing still gives considerably better performance results even over i.n.i.d fading channels.

关键词： Nakagami distribution Manganese Sensors Rayleigh channels Signal to noise ratio Cognitive radio

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A fire alarm vision system based on IR image processing

A fire alarm vision system based on IR image processing

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5th International Conference on New Trends in Information science and Service science, NISS 2011

作者： Kim, Won-Ho Kim, Seung-Kyeom Lee, Jong-Ho Hyun, Chang-Ho Division of Electrical Electronic and Control Engineering College of Engineering Kongju National University Cheonan Korea Republic of Grant of the Korean Ministry of Education Science and Technology Regional Core Research Program Zero Energy Green Village Technology Center Korea Republic of Research-year Program of Kongju National University Korea Republic of

ISBN: (纸本)9788988678626

This paper presents a fire alarm vision system based on flame detection algorithm of infrared image. The presented flame detection algorithm measures the luminance variation of candidate flame blocks of the IR image and it determines existence of the fire according to the amount of variation of luminance. By using the test images, the simulation of flame detection algorithm was performed and implemented fire alarm vision system was tested. As a result, the evaluated correct detection ratio was 85.7%. © 2011 AICIT.

关键词： Luminance

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Outage probability analysis of wireless sensor networks in the presence of channel fading and spatial correlation

Outage probability analysis of wireless sensor networks in t...

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International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Tamim Al-Murad Mohamed-Slim Alouini Electrical Engineering Department Division of Physical Sciences and Engineering King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia

Evaluating the reliability of wireless sensor networks is becoming more important as theses networks are being used in crucial applications. The outage probability defined as the probability that the error in the system exceeds a maximum acceptable threshold has recently been used as a measure of the reliability of such systems. In this work we find the outage probability of wireless sensor network in different scenarios of distributed sensing where sensors' readings are affected by spatial correlation and in the presence of channel fading.

关键词： Sensors Correlation Switches Wireless sensor networks Distortion measurement Random variables Noise

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On the ergodic capacity of legacy systems in the presence of next generation interference

On the ergodic capacity of legacy systems in the presence of...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Nurul H. Mahmood Ferkan Yilmaz Mohamed-Slim Alouini Geir E. Øien Department of Electronics & Telecomunications Norwegian University of Science and Technology Trondheim Norway Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Saudi Arabia

Next generation wireless systems facilitating better utilization of the scarce radio spectrum have emerged as a response to inefficient rigid spectrum assignment policies. These are comprised of intelligent radio nodes that opportunistically operate in the radio spectrum of existing legacy systems; yet unwanted interference at the legacy receivers is unavoidable. In order to design efficient next generation systems and to minimize their harmful consequences, it is necessary to realize their impact on the performance of legacy systems. In this work, a generalized framework for the ergodic capacity analysis of such legacy systems in the presence of interference from next generation systems is presented. The analysis is built around a model developed for the statistical representation of the interference at the legacy receivers, which is then used to evaluate the ergodic capacity of the legacy system. Moreover, this analysis is not limited to the context of legacy systems, and is in fact applicaple to any interference limited system. Findings of analytical performance analyses are confirmed through selected computer-based Monte-Carlo simulations.

关键词： Interference Receivers Next generation networking Fading Transmitters Analytical models Wireless sensor networks

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Interference alignment for degrees of freedom improvement in 3-relay half-duplex systems

Interference alignment for degrees of freedom improvement in...

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International Conference on Information, Communications and Signal Processing

作者： Seong-Ho Park Young-Chai Ko Ki-Hong Park Mohamed-Slim Alouini School of Electrical Engineering Korea University Seoul South Korea Division of Physical Science and Engineering KAUST Thuwal Makkah Saudi Arabia

ISBN: (纸本)9781457700293

In a half-duplex relaying, the capacity pre-log factor ½ is a major drawback in spectral efficiency. This paper proposes a linear precoding scheme and an alternate relaying protocol in a dual-hop half-duplex system where three relays help the communication between the source and the destination. In our proposed scheme, we consider a phase incoherent method in relays in which the source alternately transmits message signals to the different relays. In addition, we propose a linear interference alignment scheme which can eliminate the inter-relay interference resulted from the phase incoherence of relaying. Based on our analysis of degrees of freedom and our simulation results, we show that our proposed scheme achieves additional degrees of freedom compared to the conventional half-duplex relaying.

关键词： Relays Interference Signal to noise ratio Array signal processing Antennas Vectors Protocols

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A novel power and offset allocation method for spatial multiplexing MIMO Systems in optical wireless channels

A novel power and offset allocation method for spatial multi...

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IEEE Globecom Workshops

作者： Ki-Hong Park Young-Chai Ko Mohamed-Slim Alouini Division of Physical Science and Engineering KAUST Thuwal Makkah Saudi Arabia School of Electrical Engineering Korea University Seoul South Korea

We consider optical wireless communication which can be utilized for illumination and communication by relying on lighting devices. Due to the limited bandwidth of optical sources, it is challenging to achieve high data rate in optical wireless systems. In order to obtain a multiplexing gain and high spectral efficiency, we design an optical multi-input multi-output (MIMO) system utilizing a singular value decomposition-based spatial multiplexing and adaptive modulation. We note that the conventional allocation method in radio frequency MIMO channels cannot be applied directly to the optical intensity channels. In this paper, we generalize the result of power allocation method in [1] for arbitrary number of transmit and receive antennas in optical wireless MIMO systems. Based on three constraints, namely, the nonnegativity, the aggregate optical power, and the bit error rate requirement, we propose a novel method to allocate the optical power, the offset value, and the modulation size for maximum sum rate. From some selected simulation results, we show that our proposed allocation method gives a better spectral efficiency than the method that allocates the optical power equally for each data stream.

关键词： Vectors Resource management Optical transmitters Optical modulation Adaptive optics Optical receivers Wireless communication

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282

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Cytokine 2013年第3期63卷 310-310页

作者： Elia D. Tait Wojno Mario Noti Brian S. Kim Mark C. Siracusa Paul R. Giacomin Meera G. Nair Alain J. Benitez Kathryn R. Ruymann Amanda B. Muir David A. Hill Kudakwashe R. Chikwava Amin E. Moghaddam Quentin J. Sattentau Aneesh Alex Chao Zhou Paul Menard-Katcher Masato Kubo Kazushige Obata-Ninomiya Hajime Karasuyama Michael R. Comeau David Artis Department of Microbiology University of Pennsylvania Philadelphia PA USA Institute for Immunology Perelman School of Medicine University of Pennsylvania Philadelphia PA USA Queensland Tropical Health Alliance and School of Public Health and Tropical Medicine James Cook University Cairns Australia Division of Gastroenterology Hepatology and Nutrition Children’s Hospital of Philadelphia Philadelphia PA USA Department of Pediatrics Division of Allergy and Immunology Children’s Hospital of Philadelphia Philadelphia PA USA Department of Pathology and Laboratory Medicine Children’s Hospital of Philadelphia Philadelphia PA USA The Sir William Dunn School of Pathology The University of Oxford Oxford UK Department of Electrical and Computer Engineering Lehigh University Bethlehem PA USA Center for Photonics and Nanoelectronics Lehigh University BethlehemPA USA Bioengineering Program Lehigh University Bethlehem PA USA Division of Gastroenterology Hospital of the University of Pennsylvania Philadelphia PA USA Laboratory for Signal Network Research Center for Allergy and Immunology RIKEN Yokohama Institute Yokohama Japan Division of Molecular Pathology Research Institute for Biological Science Tokyo University of Science Chiba Japan Department of Immune Regulation Tokyo Medical and Dental University Graduate School Tokyo Japan JST CREST Tokyo Medical and Dental University Graduate School Tokyo Japan Inflammation Research Amgen Inc. Seattle WA USA Department of Pathobiology School of Veterinary Medicine University of Pennsylvania Philadelphia PA USA

Eosinophilic esophagitis (EoE) is a food allergy-associated disease characterized by esophageal eosinophilia and associated inflammation. EoE has become increasingly common in industrialized countries. However, current management strategies, such as treatment with swallowed steroids and dietary restrictions, are nonspecific or negatively impact the quality of life of EoE patients. In addition, use of more specific therapies that target immunoglobulin E (IgE) and interleukin (IL)-5 have been largely unsuccessful in ameliorating EoE. Thus, there is an urgent need to identify novel, specific immunological pathways that underlie the pathogenesis of EoE that could be targeted to treat this disease. Recently, a genome-wide association study identified that EoE is associated with a gain-of-function polymorphism in the gene that encodes thymic stromal lymphopoietin (TSLP). TSLP is an IL-7 family member cytokine that promotes allergic inflammation by eliciting T helper type 2 cytokine responses, IgE production, and the expansion of a distinct population of basophils . However, whether TSLP directly promotes allergic inflammation in the esophagus and the mechanisms by which TSLP might contribute to the pathogenesis of EoE remain unknown. Here, we describe a new murine model of experimental EoE-like disease that was used to investigate the role of TSLP in allergic inflammation of the esophagus. Murine experimental EoE-like disease developed independently of IgE but was dependent on TSLP-elicited basophils. Critically, therapeutic antibody-mediated neutralization of TSLP or depletion of basophil populations ameliorated established EoE-like disease in mice. Finally, elevated TSLP levels and exaggerated basophil responses were observed in esophageal biopsies from EoE patients, and a gain-of-function polymorphism in TSLP correlated with increased basophil responses in patients with EoE. Together, these data indicate that TSLP-elicited basophil responses may play a key role in medi

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ZnO nanorods for simultaneous light trapping and transparent electrode application in solar cells

ZnO nanorods for simultaneous light trapping and transparent...

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IEEE Photonics Conference (IPC)

作者： Y. Khan Y. Zhang M. Amin A. Bayraktaroglu T. K. Ng H. Bağcı J. Phillips B. S. Ooi Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

Efficacy of using vertically grown ZnO nanorod array in enhancing electromagnetic field intensity and serving as the top contact layer (transparent electrodes) for solar cells was investigated.

关键词： Zinc oxide Photovoltaic cells Indium tin oxide Electrodes Glass Charge carrier processes Optical variables control

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Investigation of the optical properties of InAs/InGaAs/GaAs quantum dot in quantum well multilayer structures for infrared photodetectors

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Journal of Physics: Conference Series 2012年第1期356卷

作者： Ts Ivanov V Donchev K Germanova Ts Tellaleva K Borissov V Hongpinyo P Vines J P R David B S Ooi Faculty of Physics St. Kliment Ohridski University of Sofia 5 J. Bourchier Blvd. 1164 Sofia Bulgaria To whom any correspondence should be addressed Department of Electrical and Computer Engineering Lehigh University. Bethlehem PA 18015 USA Department of Electronic and Electrical Engineering University of Sheffield Sheffield S1 3JD UK Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Saudi Arabia

A detailed study of InAs/InGaAs quantum dots in quantum well (DWELL) structures grown on GaAs substrates for infrared photodetectors was performed using surface photovoltage (SPV) spectroscopy. Three types of samples were investigated: as-grown, and annealed with dielectric coating SiO2 or SiN. The annealing resulted in intermixing of the material components. The amplitude and phase SPV spectra were measured at room temperature under various experimental conditions. The comparison of the SPV with the photoluminescence (PL) spectra allows one to conclude that the spectral features are due to optical transitions in the DWELL structure. The blueshift observed of these features in the intermixed samples implies that the energy levels responsible for the transitions change correspondingly due to the intermixing process. The interface band-bending in the samples and the mechanisms of the carrier dynamics were determined by a comparative analysis of the SPV amplitude and phase spectra, using our vector model for representation of the SPV signal.

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Low Complexity Symbol-Wise Beamforming for MIMO-OFDM Systems

Low Complexity Symbol-Wise Beamforming for MIMO-OFDM Systems

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Hyun-Ho Lee Ki-Hong Park Hong-Chuan Yang Young-Chai Ko School of Electrical Engineering Korea University Seoul South Korea Division of Physical Science and Engineering KAUST Thuwal Makkah Saudi Arabia Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada

In this paper, we consider a low complexity symbol-wise beamforming for MIMO-OFDM systems. We propose a non-iterative algorithm for the symbol-wise beamforming, which can provide the performance approaching that of the conventional symbol-wise beamforming based on the iterative algorithm. We demonstrate that our proposed scheme can reduce the computational complexity significantly. From our simulation results, it is evident that our proposed scheme leads to a negligible performance loss compared to the conventional symbol-wise beamforming regardless of spatial correlation or presence of co-channel interference.

关键词： Array signal processing Vectors OFDM Eigenvalues and eigenfunctions Signal to noise ratio Interference Complexity theory

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