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Characterization of the Visible Photoluminescence from Porous a-Si:H and Porous a-Si:C:H Thin Films

MRS Online Proceedings Library 2011年第1期420卷 831-836页

作者： M. J. Estes L. R. Hirsch S. Wichart G. Moddel Avionics Directorate Wright Laboratory USA Department of Electrical and Computer Engineering and the Optoelectronic Computing Systems Center University of Colorado Boulder USA

We report on the influence of doping, temperature, porosity, and bandgap on the visible photoluminescence properties of anodically-etched porous a-Si:H and a-Si:C:H thin films. Only boron-doped, p-type a-Si:H or a-Si:C:H samples exhibited any visible photoluminescence. We see evidence of discrete defect or impurity levels in temperature-dependent luminescence measurements. Unlike in porous crystalline silicon, we see no correlation of luminescence energy with porosity. We do, though, observe a correlation of luminescence energy with bandgap of the starting a-Si:C:H films. We discuss the implications of these observations on the nature of the luminescence mechanism.

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Trusted Framework for Health Information Exchange

Trusted Framework for Health Information Exchange

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Frontiers of Information Technology (FIT)

作者： Muhammad Afzal Maqbool Hussain Mahmood Ahmad Zahid Anwar School of Electrical Engineering and Computer Science Semantic Systems Research Laboratory Pakistan Department of Computing School of Electrical Engineering and Computer Science Pakistan

Healthcare Interchange Exchange (HIE) is set of healthcare entities that link regions and nations around the world to share healthcare information about patients. HIE provides a unified interface to various stakeholders to access patient data. For example, individuals want to access personal data, practitioners want to import their patient data from Personal Health Records (PHR) and researchers want to access anonymized patient data for research purposes with ensured individual privacy. Keeping in view requirements of various stakeholders it is challenging to design an HIE system that ensures the security and privacy of patient information, such that the health records remain interoperable and scalable. This paper proposes, an HIE framework that will provide secure access to patient data and adhere to the interoperability rules. Implementation of l-diversity algorithm ensures individual privacy especially when the data is made available publicly for statistical analysis.

关键词： Medical services Authentication Data privacy Joining processes Encryption Standards organizations

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Complex-ω approach versus complex-k approach in description of gain-assisted surface plasmon-polariton propagation along linear chains of metallic nanospheres

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Physical Review B 2011年第11期83卷 115451-115451页

作者： Indika B. Udagedara Ivan D. Rukhlenko Malin Premaratne Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC 3800 Australia

Propagation characteristics of surface plasmon-polaritons (SPPs) in linear chains of metallic nanospheres (LCMNs) can be found from a dispersion equation, by assuming that either frequency or wave number of a SPP is real. In this paper, we present a comparative study of SPP modes corresponding to the two types of complex solutions for an infinitely long LCMN embedded in a gain medium. We show that even though gain predominantly affects the SPP dispersion obtained with real frequency, both solutions result in the same dispersion and attenuation of SPP modes, when Ohmic losses are almost compensated by gain. In this regime, an analytic expression for the propagation length of SPPs exists, and the SPPs’ dispersion is determined by a real equation. We also demonstrate that for a given amount of gain (below the amplification limit of ~1000 cm−1), transversely polarized SPPs attenuate slower than longitudinally polarized SPPs and are, therefore, preferable for the purpose of energy transfer in gain-supplied LCMNs. The transmission windows for SPP modes of different polarizations do not overlap each other, which facilitates realization of LCMN-based plasmonic filters. Our results may prove useful in design optimization of all-optical chips for power-efficient optical supercomputers.

关键词： SURFACE plasmon resonance POLARITONS DISPERSION relations OHMIC contacts COUPLING constants (Nuclear physics) CONDUCTION band ENERGY transfer

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Propagation of surface plasmon-polaritons in linear chains of metallic nanoparticles embedded in a gain medium

Propagation of surface plasmon-polaritons in linear chains o...

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International Conference on Quantum Electronics (IQEC)

作者： Indika B. Udagedara Ivan D. Rukhlenko Malin Premaratne Advanced Computing and Simulation Laboratory (A-çL) Department of Electrical and Computer Systems Engineering Monash University VIC Australia

We analyze the two different types of complex solutions to the dispersion equation of surface plasmon-polaritons residing in a linear chain of metallic nanoparticles in the presence of gain in the host medium.

ISBN: (纸本)9780977565771

关键词： Dispersion Nanoparticles Equations Mathematical model Plasmons Optical polarization Optical surface waves

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Modified Banker's algorithm for scheduling in multi-AGV systems

Modified Banker's algorithm for scheduling in multi-AGV syst...

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IEEE International Conference on Automation Science and engineering (CASE)

作者： Luka Kalinovcic Tamara Petrovic Stjepan Bogdan Vedran Bobanac Laboratory for Robotics and Intelligent Control Systems Department of Control and Computer Engineering Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Laboratory for Renewable Energy Sources Department of Control and Computer Engineering Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

In today's highly complex multi-AGV systems key research objective is finding a scheduling and routing policy that avoids deadlock while assuring that vehicle utilization is as high as possible. It is well known that finding such an optimal policy is a NP-hard task in general case. Therefore, big part of the research is oriented towards finding various suboptimal policies that can be applied to real world plants. In this paper we propose modified Banker's algorithm for scheduling in multi-AGV systems. A predetermined mission's path is executed in a way that some non-safe states are allowed in order to achieve better utilization of vehicles. A graph-based method of polynomial complexity for verification of these states is given. Algorithm is tested on a layout of a real plant for packing and warehousing palettes. Results shown at the end of the paper demonstrate advantages of the proposed method compared with other methods based on Banker's algorithm.

关键词： Vehicles System recovery Layout Resource management Job shop scheduling Workstations

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SOLARE: Self-Organizing Latency-Aware Resource Ensemble

SOLARE: Self-Organizing Latency-Aware Resource Ensemble

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IEEE International Conference on High Performance computing and Communications (HPCC)

作者： Heungsik Eom David Isaac Wolinsky Renato J. Figueiredo Advanced Computing and Information Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville USA Department of Computer Science Yale University New Haven USA

This paper proposes and evaluates Self-Organizing Latency-Aware Resource Ensemble (SOLARE), a peer-to-peer self-organizing and self-managing cluster system based upon network coordinates and utility functions. In contrast to previous works, SOLARE is a fully decentralized clustering algorithm without any central units such as servers, super peers, cluster heads or landmarks. Furthermore, SOLARE allows for adaptability to dynamic network changes by monitoring the utility of a cluster and migrating nodes to other higher-utility clusters when the utility of an existing cluster is low. Quantitative, simulation-driven evaluations show that SOLARE is able to satisfy user demands expressed by utility functions that integrate system parameters in terms of intra cluster latencies and the number of cluster members. Also, we verify the ability of SOLARE to adapt to dynamic network changes through simulation based experiments that consider the number of nodes which migrate into another cluster and average utility value as nodes join SOLARE.

关键词： Peer to peer computing Clustering algorithms Monitoring computer architecture Servers Performance evaluation Heuristic algorithms

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Topology design and performance analysis for networked earth observing small satellites

Topology design and performance analysis for networked earth...

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MILCOM, Military Communications Conference

作者： Paul Muri Janise McNair Joe Antoon Ann Gordon-Ross Kathryn Cason Norman Fitz-Coy Wireless and Mobile (WAM) Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA NSF Center of High Performance Reconfigurable Computing (CHREC) Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Space Systems Group (SSG) Department of Mechanical and AeroSpace Engineering University of Florida Gainesville FL USA

In order to network small satellite constellations for Earth observation and communication, several limitations must be addressed, including distributed topology management, slow down-link data-rates, and single point-to-point communication. Since distributed satellite constellations exacerbate the severity of these limitations, thorough analysis of a constellation's network performance is required to ensure that task objectives are achievable. In this paper, we designed network topologies using Satellite Toolkit (STK) for two low Earth orbit (LEO) Earth observing small satellite constellations: a sun-synchronous repeating ground track constellation and a flower (an elliptical repeating ground track) constellation. Both constellations include six sink satellites that provide a high speed down-link relay point to a ground station. We compared the constellations' inter-satellite links and down-links with respect to network metrics including access window time, drop-ratio, and throughput. We evaluated these network metrics using the Network Simulator (ns-2). Though previous works have proposed sun-synchronous and flower small satellite constellations for Earth observation, these constellations have not been analyzed for these network metrics. Results show that the sun-synchronous constellation with a repeating ground track outperforms the flower constellation with respect to more access time, lower drop-ratio, and higher throughput. Additionally, our simulations determined the optimum media access control slot time and packet transmission intervals for long distance satellite links. Further, our method of designing satellite constellation topologies in STK and exporting them to ns-2 can be used for future studies on any desired constellation network performance evaluations.

关键词： Satellites Satellite broadcasting Orbits Earth Satellite constellations Databases Mobile communication

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Degree of polarization of Mie scattered stationary partially coherent electromagnetic fields

Degree of polarization of Mie scattered stationary partially...

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International Conference on Quantum Electronics (IQEC)

作者： Madara L. Marasinghe Malin Premaratne David M. Paganin Advanced Computing and Simulation Laboratory (AL) Department of Electrical and Computer Systems Engineering Faculty of Engineering Monash University Clayton VIC Australia School of Physics Faculty of Science Monash University Clayton VIC Australia

The polarization of non-paraxial partially coherent light scattered from nanospheres cannot be described easily. We utilize the degree of polarization to quantify Mie scattered partially coherent light and demonstrate... 详细信息

ISBN: (纸本)9780977565771

关键词： Polarization Lattices Electromagnetic fields Optics Coherence Dielectrics

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Promoting Harmonization of BME Education in Europe: The CRH-BME Tempus Project

Promoting Harmonization of BME Education in Europe: The CRH-...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Nicolas Pallikarakis Zhivko Bliznakov Damijan Miklavcic Tomaz Jarm Ratko Magjarevic Igor Lackovic Leandro Pecchia Rita Stagni Akos Jobaggy Joseph Barbenel University of Patras School of Health Sciences Department of Medical Physics Biomedical Technology Unit Institute of Biomedical Technology University of Ljubljana Faculty of Electrical Engineering University of Zagreb Faculty of Electrical Engineering and Computing University of Naples - Federico II Department of Biomedical Electronic and Telecommunication Engineering University of Bologna Department of Electronics Computer Science and Systems Budapest University of Technology and Economics Department of Measurement and Information Systems University of Strathclyde

ISBN: (纸本)9781424441211

Biomedical Engineers should be prepared to adapt to existing or forecasted needs. There is a strong pressure on education, training and life long learning programs to continuously adapt their objectives in order to face new requirements and challenges. The main objective of the TEMPUS IV, CRH-BME project is to update existing curricula in the field of Biomedical engineering (BME) in order to meet recent and future developments in the area, address new emerging inter-disciplinary domains that appear as a result of the R&D progress and respond to the BME job market demands. The first step is to extensively review the curricula in the BME education field. In this paper, a proposal for a generic curriculum in the BME education is presented, in order to meet recent and future developments and respond to the demands of the BME job market. Adoption of the core program structure will facilitate harmonization of studies as well as student and staff exchange across Europe, thus promoting the European Higher Education Area.

关键词： Biology Europe Biomedical engineering Educational institutions Knowledge engineering Mathematics

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Abnormal electron paths induced by Klein tunneling in graphene quantum point contacts

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Physical Review B 2011年第3期84卷 035426-035426页

作者： Rui Yang Liang Huang Ying-Cheng Lai Celso Grebogi School of Electrical Computer and Energy Engineering Arizona State University Tempe Arizona 85287 USA Institute of Computational Physics and Complex Systems and Key Laboratory for Magnetism and Magnetic Materials of MOE Lanzhou University Lanzhou Gansu 730000 China Department of Physics Arizona State University Tempe Arizona 85287 USA Institute for Complex Systems and Mathematical Biology School of Natural and Computing Sciences King’s College University of Aberdeen Aberdeen United Kingdom

We study quantum transport in a general graphene system subject to external potential, a situation that can be expected in all kinds of future graphene-based electronic devices with quantum dots and quantum point contacts. We find that electrons tend to take on propagating paths due to Klein tunneling that have absolutely no counterpart in nonrelativistic quantum systems. Strikingly, such abnormal quantum paths can lead to an extreme type of fractal-like of conductance fluctuations, not seen previously in any quantum transport systems. This phenomenon has profound implications to the development of graphene based devices that require stable electronic properties.

关键词： ELECTRONIC systems QUANTUM electronics QUANTUM dots CATHODE rays LEPTONS (Nuclear physics)

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