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The 5th International Conference on Biomedical engineering and Biotechnology (ICBEB 2016) Abstracts

BMC MEDICAL IMAGING 2016年第SUPPL 1期16卷 65-65页

作者： [Anonymous] Department of MRI Shandong Medical Imaging Research Institute Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China Department of Interventional Radiology Shandong Provincial Hospital Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China College of Information Science and Technology Engr. Research Center of Digitized Textile & Fashion Tech. for Ministry of Education Donghua University Shanghai 201620 China Intelligent multimedia information processing Lab College of Software Northeastern University Shenyang Liaoning Province 110004 China Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of Computer Science and Technology Nanjing Normal University Nanjing China Department of Electrical Engineering The City College of New York CUNY New York USA Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing China School of Electronic Science and Engineering Nanjing University Nanjing Jiangsu 210046 China College of Engineering Nanyang Technological University Singapore 639798 Singapore School of Electronic Information Shanghai Dianji University Shanghai China School of Natural Sciences and Mathematics Shepherd University Shepherdstown WV 25443 USA Davis College of Agriculture Natural Resources and Design West Virginia University Morgantown WV 26505 USA State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China Center of Medical Physics and Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China College of Agricultural and Life Sciences University of Florida Gainesville FL 32611 USA Courant Institute of Mathematical Sciences New York University New York NY 10012 USA Translational Imaging Division & MRI Unit Columbia University and New York State Psychiatric Institute New York NY 10032 USA Guangxi Key Laboratory of Manufacturing System & Adv

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RAID-6 Reed-Solomon Codes with Asymptotically Optimal Arithmetic Complexities

RAID-6 Reed-Solomon Codes with Asymptotically Optimal Arithm...

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IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications

作者： Sian-Jheng Lin Amira Alloum Tareq Y. Al-Naffouri School of Information Science and Technology University of Science and Technology of China (USTC) Nokia Bell Labs Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781509032556

In computer storage, RAID 6 is a level of RAID that can tolerate two failed drives. When RAID-6 is implemented by Reed-Solomon (RS) codes, the penalty of the writing performance is on the field multiplications in the second parity. In this paper, we present a configuration of the factors of the second-parity formula, such that the arithmetic complexity can reach the optimal complexity bound when the code length approaches infinity. In the proposed approach, the intermediate data used for the first parity is also utilized to calculate the second parity. To the best of our knowledge, this is the first approach supporting the RAID-6 RS codes to approach the optimal arithmetic complexity.

关键词： RAID-6 codes Computational complexity Distributed storage systems Erasure codes

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Über Oxidationszahl‐Obergrenzen in der Chemie

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Angewandte Chemie 2018年第12期130卷

作者： Shu‐Xian Hu Wan‐Lu Li Jun‐Bo Lu Junwei Lucas Bao Haoyu S. Yu Donald G. Truhlar John K. Gibson Joaquim Marçalo Mingfei Zhou Sebastian Riedel W. H. Eugen Schwarz Jun Li Key Laboratory of Organic Optoelectronics & Molecular Engineering of the Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 China Beijing Computer Science Research Center Haidian Beijing 100193 China Chemical Theory Center Department of Chemistry and Minnesota Supercomputing Institute University of Minnesota Minneapolis MN 55455-0431 USA Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Centro de Ciências e Tecnologias Nucleares Instituto Superior Técnico Universidade de Lisboa 2695-066 Bobadela LRS Portugal Department of Chemistry Fudan University Shanghai 200433 China Anorganische Chemie Institut für Chemie und Biochemie Freie Universität Berlin 14195 Berlin Deutschland Physical and Theoretical Chemistry Lab Universität Siegen 57068 Siegen Deutschland

Der Begriff Oxidationszahl ( OS ) ist auf der Basis des Lewis‐Elektronenpaar‐Bildes definiert, wobei Bindungselektronen dem jeweils elektronegativeren Element zugeordnet werden. Der Begriff ist hilfreich zur “Buchhaltung” der Elektronen, zur Vorhersage von chemischen Trends und zur Planung von Synthesewegen. Experimentelle und quantenchemische Befunde legen eine obere Grenze von etwa +8 für die OS in stabilen (neutralen) chemischen Substanzen unter normalen Bedingungen nahe. OS =+9 wurde für das isolierte [IrO 4 ] + ‐Kation in der Gasphase beobachtet. Vorhergesagte OS =+10 für das isolierte [PtO 4 ] 2+ ‐Kation wird hier theoretisch nur für tiefe Temperaturen bestätigt, konnte aber noch nicht experimentell verifiziert werden. Verbindungen mit hoher OS tendieren zur spontanen Reduktion des zentralen Metallatoms unter Oxidation der Liganden, etwa von O −2 unter Bildung von . O −1 und O‐O‐Bindungen, wobei nicht‐Lewis‐konforme Strukturen gebildet werden können.

关键词： Bindungstheorie computerchemie Oxidationszahlen Oxide Übergangsmetalle

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TV Broadcast Efficiency in 5G Networks from Subscriber Prospective

TV Broadcast Efficiency in 5G Networks from Subscriber Prosp...

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IEEE Global Communications Conference

作者： Chun Pong Lau Basem Shihada Computer Electrical and Mathematical Science Engineering Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781479959532

The flexibility of radio access network facilitated by 5G networks opens the gateway of deploying dynamic strategies for broadcasting TV channels in an efficient way. Currently, spectrum efficiency and bandwidth efficiency are the two common metrics measuring the efficiency of a system. These metrics assess the net bitrate for a unit of spectrum bandwidth. However, there is a lack of measurement, quantifying the effectiveness of a broadcasting strategy from the user perspective. In this paper, we introduce a novel measurement approach, called broadcast efficiency which considers the mobile user as a main reference. Broadcast efficiency is calculated as the number of served audiences per unit of radio resource. From numerical analysis, we show that broadcasting unpopular TV channels dramatically decreases the broadcast efficiency. This finding is evaluated by employing multiple distributions on the size of audience among TV channels. Furthermore, by conducting a real-life simulation, we discover that a high broadcast efficiency may result in a low percentage of served audiences if the audiences of TV channels are quite evenly distributed.

关键词： TV Broadcast Efficiency 5G Television Television channels broadcasting Audiences 5G mobile communication Wireless networks spectral efficiency bandwidth efficiency doorways

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Green Smartphone GPUs: Optimizing Energy Consumption using GPUFreq Scaling Governors

Green Smartphone GPUs: Optimizing Energy Consumption using G...

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IEEE International Conference on Wireless and Mobile Computing, Networking and Communications

作者： Enas Ahmad Basem Shihada Computer Electrical and Mathematical Science Engineering Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781467377027

Modern smartphones are limited by their short battery life. The advancement of the graphical performance is considered as one of the main reasons behind the massive battery drainage in smartphones. In this paper we present a novel implementation of the GPUFreq Scaling Governors, a Dynamic Voltage and Frequency Scaling (DVFS) model implemented in the Android Linux kernel for dynamically scaling smartphone Graphical Processing Units (GPUs). The GPUFreq governors offer users multiple variations and alternatives in controlling the power consumption and performance of their GPUs. We implemented and evaluated our model on a smartphone GPU and measured the energy performance using an external power monitor. The results show that the energy consumption of smartphone GPUs can be significantly reduced with a minor effect on the GPU performance.

关键词： Smartphones GPU DVFS CPUFreq Governors Energy Efficiency

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Joint Hybrid Backhaul and Access Links Design in Cloud-Radio Access Networks

Joint Hybrid Backhaul and Access Links Design in Cloud-Radio...

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IEEE Vehicular Technology Conference

作者： Oussama Dhifallah Hayssam Dahrouj Tareq Y. Al-Naffouri Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Department of Electrical and Computer Engineering Effat University

ISBN: (纸本)9781479980925

The cloud-radio access network (CRAN) is expected to be the core network architecture for next generation mobile radio systems. In this paper, we consider the downlink of a CRAN formed of one central processor (the cloud) and several base-station (BS), where each BS is connected to the cloud via either a wireless or capacity-limited wireline backhaul link. The paper addresses the joint design of the hybrid backhaul links (i.e., designing the wireline and wireless backhaul connections from the cloud to the BSs) and the access links (i.e., determining the sparse beamforming solution from the BSs to the users). The paper formulates the hybrid backhaul and access link design problem by minimizing the total network power consumption. The paper solves the problem using a two-stage heuristic algorithm. At one stage, the sparse beamforming solution is found using a weighted mixed ?1/?2 norm minimization approach;the correlation matrix of the quantization noise of the wireline backhaul links is computed using the classical rate-distortion theory. At the second stage, the transmit powers of the wireless backhaul links are found by solving a power minimization problem subject to quality-of-service constraints, based on the principle of conservation of rate by utilizing the rates found in the first stage. Simulation results suggest that the performance of the proposed algorithm approaches the global optimum solution, especially at high signal-to-interference-plus-noise ratio (SINR).

关键词： Joint Hybrid Backhaul Access Links Design Cloud-Radio Access Networks return stroke Wireless networks CLOUDS Clouds quantization noise core network Transmitter power access network wireless Blind source separation Access Bahamas Power consumption

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Decentralized Group Sparse Beamforming for Multi-Cloud Radio Access Networks

Decentralized Group Sparse Beamforming for Multi-Cloud Radio...

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IEEE Global Communications Conference

ISBN: (纸本)9781479959532

Recent studies on cloud-radio access networks (CRANs) assume the availability of a single processor (cloud) capable of managing the entire network performance;inter-cloud interference is treated as background noise. This paper considers the more practical scenario of the downlink of a CRAN formed by multiple clouds, where each cloud is connected to a cluster of multiple-antenna base stations (BSs) via high-capacity wireline backhaul links. The network is composed of several disjoint BSs' clusters, each serving a pre-known set of single-antenna users. To account for both inter-cloud and intra-cloud interference, the paper considers the problem of minimizing the total network power consumption subject to quality of service constraints, by jointly determining the set of active BSs connected to each cloud and the beamforming vectors of every user across the network. The paper solves the problem using Lagrangian duality theory through a dual decomposition approach, which decouples the problem into multiple and independent subproblems, the solution of which depends on the dual optimization problem. The solution then proceeds in updating the dual variables and the active set of BSs at each cloud iteratively. The proposed approach leads to a distributed implementation across the multiple clouds through a reasonable exchange of information between adjacent clouds. The paper further proposes a centralized solution to the problem. Simulation results suggest that the proposed algorithms significantly outperform the conventional per-cloud update solution, especially at high signal-to-interference-plus-noise ratio (SINR) target.

关键词： Clouds CLOUDS Wireless networks duality theory Beamforming information exchange Solutions BACKGROUND NOISE Decentralized

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Monolayer graphene sensing enabled by the strong Fano-resonant metasurface

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Nanoscale 2016年第39期8卷 17278-17284页

作者： Quan Li Longqing Cong Ranjan Singh Ningning Xu Wei Cao Xueqian Zhang Zhen Tian Liangliang Du Jiaguang Han Weili Zhang Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education) Tianjin 300072 China. tianzhen@*** jiaghan@*** and School of Electronic Engineering Tianjin University of Technology and Education Tianjin 300222 China. Division of Physics and Applied Physics Center for Disruptive Photonic Technologies School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore. ranjans@ntu.edu.sg. School of Electrical and Computer Engineering Oklahoma State University Stillwater Oklahoma 74078 USA. Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education) Tianjin 300072 China. tianzhen@*** jiaghan@***. Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education) Tianjin 300072 China. tianzhen@*** jiaghan@*** and College of Electrical Engineering and Automation Guilin University of Electronic Technology Guilin 541000 China. Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education) Tianjin 300072 China. tianzhen@*** jiaghan@*** and School of Electrical and Computer Engineering Oklahoma State University Stillwater Oklahoma 74078 USA.

Recent advances in graphene photonics reveal promising applications in the technologically important terahertz spectrum, where graphene-based active terahertz metamaterial modulators have been experimentally demonstrated. However, the sensitivity of the atomically thin graphene monolayer towards sharp Fano resonant terahertz metasurfaces remains unexplored. Here, we demonstrate thin-film sensing of the graphene monolayer with a high quality factor terahertz Fano resonance in metasurfaces consisting of a two-dimensional array of asymmetric resonators. A drastic change in the transmission amplitude of the Fano resonance was observed due to strong interactions between the monolayer graphene and the tightly confined electric fields in the capacitive gaps of the Fano resonator. The deep-subwavelength sensing of the atomically thin monolayer graphene further highlights the extreme sensitivity of the resonant electric field excited at the dark Fano resonance, allowing the detection of an analyte that is λ/1 000 000 thinner than the free space wavelength.

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Intramolecular Hydrogen Bonding Restricts Gd–Aqua‐Ligand Dynamics

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Angewandte Chemie 2017年第20期129卷

作者： Eszter Boros Raja Srinivas Hee‐Kyung Kim Arnold M. Raitsimring Andrei V. Astashkin Oleg G. Poluektov Jens Niklas Andrew D. Horning Bruce Tidor Peter Caravan A. A. Martinos Center for Biomedical Imaging Massachusetts General Hospital Harvard Medical School 149 13th Street Suite 2301 Charlestown MA 02129 USA Department of Biological Engineering and Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Chemistry and Biochemistry The University of Arizona 1306 E. University Boulevard Tucson AZ 85721-0041 USA Chemical Sciences and Engineering Division Argonne National Laboratory Argonne IL 60439 USA

Aqua ligands can undergo rapid internal rotation about the M−O bond. For magnetic resonance contrast agents, this rotation results in diminished relaxivity. Herein, we show that an intramolecular hydrogen bond to the aqua ligand can reduce this internal rotation and increase relaxivity. Molecular modeling was used to design a series of four Gd complexes capable of forming an intramolecular H‐bond to the coordinated water ligand, and these complexes had anomalously high relaxivities compared to similar complexes lacking a H‐bond acceptor. Molecular dynamics simulations supported the formation of a stable intramolecular H‐bond, while alternative hypotheses that could explain the higher relaxivity were systematically ruled out. Intramolecular H‐bonding represents a useful strategy to limit internal water rotational motion and increase relaxivity of Gd complexes.

关键词： Aqua-Ionen-Dynamik Gadolinium-Komplexe Moleküldynamik Relaxivität

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On the Asymptotic Ergodic Capacity of FSO Links with Generalized Pointing Error Model

On the Asymptotic Ergodic Capacity of FSO Links with General...

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IEEE International Conference on Communications

作者： Hessa Al-Quwaiee Hong-Chuan Yang Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST) Department of Electrical and Computer Engineering University of Victoria

ISBN: (纸本)9781467364300

Free-space optical (FSO) communication systems are negatively affected by two physical phenomenon, namely, scintillation due to atmospheric turbulence and pointing errors. To quantize the effect of these two factors on FSO system performance, we need an effective mathematical model for them. Scintillations are typically modeled by the log-normal and Gamma-Gamma distributions for weak and strong turbulence conditions, respectively. In this paper, we propose and study a generalized pointing error model based on the Beckmann distribution. We then derive the asymptotic ergodic capacity of FSO systems under the joint impact of turbulence and generalized pointing error impairments.

关键词： Free-space optical Log-normal fading Gamma-Gamma fading Ergodic capacity Asymptotic High SNR Pointing errors Beckmann distribution

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