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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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Predictor Input Selection for Two Stage Identification in Dynamic Networks

Predictor Input Selection for Two Stage Identification in Dy...

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European Control Conference

作者： Arne Dankers Paul M. J. Van den Hof Xavier Bombois Peter S. C. Heuberger Delft Center for Systems and Control Delft University of Technology Dept. of Electrical Engineering Eindhoven University of Technology Dept. of Mechanical Engineering Eindhoven University of Technology

ISBN: (纸本)9781479901890

Recently, the Two-Stage method has been proposed as a tool to obtain consistent estimates of modules embedded in dynamic networks [1], [2]. However, for this method the variables that are included in the predictor model are currently not considered as a user choice. In this paper it is shown that there is considerable freedom as to which variables can be included in the predictor model as inputs, and still obtain consistent estimates of the module of interest. Conditions that the choice of predictor inputs must satisfy are presented. The conditions could be used to find the smallest number of predictor inputs for instance. Algorithms are presented for checking the conditions and obtaining the estimates.

关键词： Noise Predictive models Power system dynamics Prediction algorithms Sensors Equations Vectors

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Modular Framework for Simulation Modelling of Interaction-Rich Transport systems

Modular Framework for Simulation Modelling of Interaction-Ri...

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International IEEE Conference on Intelligent Transportation systems

作者： Michal Jakob Zbynek Moler Agent Technology Center Dept. of Computer Science and Engineering Faculty of Electrical Engineering Czech Technical University

ISBN: (纸本)9781479929153

The increasing pervasiveness of information and communication technology (ICT) in transport systems changes the requirements on techniques and tools for transport simulation modelling. Novel ICT-powered responsive mobility services, such as real-time on-demand transport, are interaction-rich in a sense that they rely on frequent, ad hoc interactions between various entities of the transport system. These interactions have to be properly captured in the model if it is to accurately represent the dynamics of the modelled transport system. Unfortunately, existing modelling tools are not well suited for modelling interaction-rich transport systems. We have therefore developed a novel modular simulation framework designed specifically for modelling transport systems in which ad hoc interactions and decision making play an important role. The framework provides an extensible library of modelling elements based on a unifying ontology of agent-based modelling abstractions, a high-performance discrete-event simulation engine and suite of tools supporting real-world deployment and utilization of implemented models. By fully leveraging the conceptual foundation of multiagent systems, our framework provides flexibility and extensibility that is difficult to achieve by existing approaches. We demonstrate the applicability of the framework on the models of five distinct interaction-rich transport systems.

关键词： transport system Frameworks Simulation models Modeling Information and communication technology Multi-agent systems Modularity EQUIPMENT extensibility

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Artificial Intelligence Applications and Innovations: 9th IFIPWG 12.5 International Conference, AIAI 2013 Paphos, Cyprus, September 30 - October 2, 2013 Proceedings

Artificial Intelligence Applications and Innovations: 9th IF...

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9th IFIP WG 12.5 International Conference on Artificial Intelligence Applications and Innovations, AIAI 2013

作者： Papadopoulos, Harris Andreou, Andreas S. Iliadis, Lazaros Maglogiannis, Ilias Frederick University Department of Computer Science and Engineering 1036 Nicosia Cyprus Cyprus University of Technology Department of Electrical Engineering/Computer Engineering and Informatics 3603 Limassol Cyprus Democritus University of Thrace Dept. of Forestry and Management of the Environment and Natural Resources 68200 Orestiada Greece University of Piraeus Department of Digital Systems 18534 Piraeus Greece

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Generalised Time-Dependent Graphs for Fully Multimodal Journey Planning

Generalised Time-Dependent Graphs for Fully Multimodal Journ...

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International IEEE Conference on Intelligent Transportation systems

作者： Jan Hrncir Michal Jakob Agent Technology Center Dept. of Computer Science and Engineering Faculty of Electrical Engineering Czech Technical University in Prague

ISBN: (纸本)9781479929153

We solve the fully multimodal journey planning problem, in which journey plans can employ any combination of scheduled public transport (e.g., bus, tram and underground), individual (e.g., walk, bike, shared bike and car), and on-demand (e.g., taxi) transport modes. Our solution is based on a generalised time-dependent graph that allows representing the fully multimodal earliest arrival problem as a standard graph search problem and consequently using general shortest path algorithms to solve it. In addition, to allow users to express their journey planning preferences and to speed up the search process, flexible journey plan templates can be used in our approach to restrict the transport modes and mode combinations permitted in generated journey plans. We have evaluated our solution on a real-world transport network of the city of Helsinki and achieved practically usable search runtimes in the range of hundreds of milliseconds.

关键词： Shortest path algorithms Search process MILLISECOND Solutions Cars bicycles city Planning travel

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Predictor Input Selection for Direct Identification in Dynamic Networks

Predictor Input Selection for Direct Identification in Dynam...

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IEEE Annual Conference on Decision and Control

作者： Arne G. Dankers Paul M. J. Van den Hof Peter S. C. Heuberger Delft Center for Systems and Control Delft University of Technology The Netherlands Dept. of Electrical Engineering Eindhoven University of Technology The Netherlands Dept. of Mechanical Engineering Eindhoven University of Technology The Netherlands

ISBN: (纸本)9781467357159

In the literature methods have been proposed which enable consistent estimates of modules embedded in complex dynamic networks. In this paper the network extension of the so called closed-loop Direct Method is investigated. Currently, for this method the variables which must be included in the predictor model are not considered as a user choice. In this paper it is shown that there is some freedom as to which variables to include in the predictor model as inputs, and still obtain consistent estimates of the module of interest. Conditions on this choice of predictor inputs are presented.

关键词： Predictor Input Selection Direct Identification Dynamic Networks

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Maximum Power Point Tracking of Solar Photovoltaic Panels Using Advanced Perturbation and Observation Algorithm

Maximum Power Point Tracking of Solar Photovoltaic Panels Us...

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IEEE Conference on Industrial Electronics and Applications

作者： Duy C. Huynh Thu A. T. Nguyen Matthew W. Dunnigan Markus A. Mueller Power Systems Dept. University of Technology Vietnam National University Electrical Electronics & Computer Engineering Dept. Heriot-Watt University Institute for Energy Systems The University of Edinburgh

ISBN: (纸本)9781467363204

An efficient maximum power point tracking (MPPT) scheme is necessary to improve the efficiency of a solar photovoltaic (PV) panel. This paper proposes an advanced perturbation and observation (P&O) algorithm for tracking the maximum power point (MPP) of a solar PV panel. Solar PV cells have a non-linear V-I characteristic with a distinct MPP which depends on environmental factors such as temperature and irradiation. In order to continuously harvest maximum power from the solar PV panel, it always has to be operated at its MPP. The proposed P&O algorithm can reduce the main drawbacks commonly related to the P&O algorithm. This is achieved with determining the short-circuit current before each perturbation and observation stage. The obtained simulation results are compared with MPPs achieved using the conventional P&O algorithm under various atmospheric conditions. The results show that the advanced P&O algorithm is better than the conventional P&O algorithms for tracking MPPs of solar PV panels. Additionally, it is simple and can be easily implemented in digital signal processor (DSP).

关键词： Solar photovoltaic panel Maximum power point tracking Perturbation and observation algorithm

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Capacity region of a class of interfering relay channels

Capacity region of a class of interfering relay channels

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Hieu T. Do Tobias J. Oechtering Mikael Skoglund Mai Vu School of Electrical Engineering & ACCESS Linnaeus Center KTH Royal Institute of Technology Stockholm Sweden Dept. of Electrical & Computer Engineering Tufts University USA

This paper studies a new model for cooperative communication, the interfering relay channels. We show that the hash-forward scheme introduced by Kim for the primitive relay channel is capacity achieving for a class of semideterministic interfering relay channels. The obtained capacity result generalizes and unifies earlier capacity results for a class of primitive relay channels and a class of deterministic interference channels.

关键词： Relays Interference channels Receivers Transmitters Entropy Integrated circuits

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Gaussian interfering relay channels

Gaussian interfering relay channels

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Asilomar Conference on Signals, systems & computers

作者： Hieu T. Do Tobias J. Oechtering Mikael Skoglund Mai Vu School of Electrical Engineering and ACCESS Linnaeus Center KTH Royal Institute of Technology Stockholm Sweden Dept. of Electrical and Computer Engineering Tufts University USA

ISBN: (纸本)9781479923915

We extend the primitive relay channel (PRC) introduced by Cover and Kim to a more general scenario where two Gaussian PRC's cause interference to each other. We show that extended hash-and-forward relaying with proper power allocation can achieve bounded gaps to the capacity region of the Gaussian channel in different regimes of channel parameters.

关键词： Relays Receivers Integrated circuits Transmitters Quantization (signal) Interference Resource management

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Development of a 1200 V, 120 A SiC MOSFET module for high-temperature and high-frequency applications

Development of a 1200 V, 120 A SiC MOSFET module for high-te...

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IEEE Workshop on Wide Bandgap Power Devices and Applications (WiPDA)

作者： Zheng Chen Yiying Yao Wenli Zhang Dushan Boroyevich Khai Ngo Paolo Mattavelli Rolando Burgos The Bradley Dept. of Electrical and Computer Engineering Center for Power Electronics Systems (CPES) The Dept. of Material Science and Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

This paper presents a 1200 V, 120 A SiC MOSFET phase-leg module capable of operating at 200 °C ambient temperature. Paralleling six 20 A MOSFET bare dice for each switch, this module outperforms the commercial SiC modules in higher operating temperature and lower package parasitics at a comparable power rating. The module's high-temperature capability is validated through the extensive characterizations of the SiC MOSFET, as well as the careful selections of suitable packaging materials. Particularly, the sealed-step-edge technology is implemented on the DBC substrates to improve the module's thermal cycling lifetime. Though still based on the regular wire-bond structure, the module is able to achieve over 40% reduction in the switching loop inductance compared to a commercial SiC module by optimizing its internal layout. By further embedding decoupling capacitors directly on the substrates, the module also allows SiC MOSFETs to be switched twice faster with only one-third turn-off over-voltages compared to the commercial module.

关键词： MOSFET Silicon carbide Switches Substrates Layout Logic gates

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