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Reduced-reference video quality metric based on edge information 4

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Reduced-reference video quality metric based on edge informa...

4th IEEE International Conference on Smart Instrumentation, Measurement and Applications, ICSIMA 2017

作者： Abdul Rahman, Farah Diyana Agrafiotis, Dimitris Ibrahim, Ahmad Imran Department of Electrical and Computer Engineering Department of Mechatronics Engineering International Islamic University Malaysia Malaysia Department of Electrical and Electronic Engineering University of Bristol BS8 1UB United Kingdom

ISBN: (纸本)9781538639603

In multimedia transmission, it is important to rely on an objective quality metric which accurately represents the subjective quality of processed images and video sequences. Reduced-reference metrics make use of side-information that is transmitted to the receiver for estimating the quality of the received sequence with low complexity. In this paper, novel Edge-based Dissimilarity Reduced-Reference video quality metric (EDIRR) is proposed. The metric is evaluated by finding the dissimilarity between the edge information of original and distorted sequences. The edge degradation can be detected in this manner as perceived video quality is highly associated with edge structural. In this paper, the aim is to construct a novel RR video quality metric based on edge dissimilarity for video quality assessment. The proposed metric is derived from the motivation that human perception understands an image mainly according to its low-level features, specifically the edges, which are a measure of the significance of a local structure. From the results obtained, there is a moderate positive correlation between the proposed metric score with the subjective scores in the overall observation but with correlation for tested sequences with a lower DMOS. EDIRR, with LCC of 0.938, outperforms PSNR and VIFP on wireless distortion induced sequences and the proposed metric, with LCC of 0.988, performs on a par with PSNR, SSIM and VIFP for H.264 compressions distortions. © 2017 IEEE.

关键词： Image edge detection Visualization Distortion Quality assessment Video recording Distortion measurement

Observation of one-way Einstein-Podolsky-Rosen steering

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Observation of one-way Einstein-Podolsky-Rosen steering

Laser Science, LS 2018

作者： Wollmann, Sabine Baker, Travis J. Walk, Nathan Bennet, Adam J. Tischler, Nora Wiseman, Howard M. Pryde, Geoff J. Matthews, Jonathan C.F. Centre for Quantum Computation and Communication Technology Centre for Quantum Dynamics Griffith University BrisbaneQLD4111 Australia Quantum Engineering Technology Labs H. H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BS8 1FD United Kingdom Department of Computer Science University of Oxford OxfordOX1 3QD United Kingdom

We prove and experimentally demonstrate that EPR-steering can be rigorously asymmetric, unlike Bell tests, by constructing quantum states which are steerable in one direction, whilst two-way steering is impossible wit... 详细信息

ISBN: (纸本)9781943580460

关键词： Integrated photonics Polarization Quantum communications Quantum key distribution Quantum teleportation

Modelling microbial fuel cells using lattice boltzmann methods

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arXiv 2018年

作者： Tsompanas, Michail-Antisthenis Adamatzky, Andrew Ieropoulos, Ioannis Phillips, Neil Sirakoulis, Georgios Ch. Greenman, John Unconventional Computing Centre University of the West of England BristolBS16 1QY United Kingdom Bristol BioEnergy Centre University of the West of England BristolBS16 1QY United Kingdom Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi67100 Greece

An accurate modelling of bio-electrochemical processes that govern Microbial Fuel Cells (MFCs) and mapping their behaviour according to several parameters will enhance the development of MFC technology and enable their successful implementation in well defined applications. The geometry of the electrodes is among key parameters determining efficiency of MFCs due to the formation of a biofilm of anodophilic bacteria on the anode electrode, which is a decisive factor for the functionality of the device. We simulate the bioelectrochemical processes in an MFC while taking into account the geometry of the electrodes. Namely, lattice Boltzmann methods are used to simulate the fluid dynamics and the advection-diffusion phenomena in the anode compartment. The model is verified on voltage and current outputs of a single MFC derived from laboratory experiments under continuous flow. Copyright © 2018, The Authors. All rights reserved.

关键词： Computational methods

Tackling Disorder in γ-Ga2O3

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arXiv 2022年

作者： Ratcliff, Laura E. Oshima, Takayoshi Nippert, Felix Janzen, Benjamin M. Kluth, Elias Goldhahn, Rüdiger Feneberg, Martin Mazzolini, Piero Bierwagen, Oliver Wouters, Charlotte Nofal, Musbah Albrecht, Martin Swallow, Jack E.N. Jones, Leanne A.H. Thakur, Pardeep K. Lee, Tien-Lin Kalha, Curran Schlueter, Christoph Veal, Tim D. Varley, Joel B. Wagner, Markus R. Regoutz, Anna Department of Materials Imperial College London LondonSW7 2AZ United Kingdom Centre for Computational Chemistry School of Chemistry University of Bristol BristolBS8 1TS United Kingdom Department of Electrical and Electronic Engineering Saga University Saga840-8502 Japan Technische Universität Berlin Institute of Solid State Physics Hardenbergstrasse 36 Berlin10623 Germany Institut für Physik Otto-von-Guericke-Universität Magdeburg Universitätsplatz 2 Magdeburg39106 Germany Paul-Drude-Institut fur Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin e.V. Hausvogteiplatz 5-7 Berlin10117 Germany Department of Mathematical Physical and Computer Sciences University of Parma Viale delle Scienze 7/A Parma43124 Italy Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin e.V. Hausvogteiplatz 5-7 Berlin10117 Germany Leibniz-Institut fÃŒr Kristallzüchtung Max-Born-Str. 2 Berlin12489 Germany Department of Materials University of Oxford Parks Road OxfordOX1 3PH United Kingdom Stephenson Institute for Renewable Energy Department of Physics University of Liverpool LiverpoolL69 7ZF United Kingdom Diamond Light Source Ltd. Diamond House Harwell Science and Innovation Campus Didcot OX11 0DE United Kingdom Diamond Light Source Ltd. Harwell Science and Innovation Campus Didcot OX11 0DE United Kingdom Department of Chemistry University College London 20 Gordon Street LondonWC1H 0AJ United Kingdom Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 Hamburg22607 Germany Lawrence Livermore National Laboratory LivermoreCA94550 United States

Ga2O3 and its polymorphs are attracting increasing attention. The rich structural space of polymorphic oxide systems such as Ga2O3 offers potential for electronic structure engineering, which is of particular interest for a range of applications, such as power electronics. γ-Ga2O3 presents a particular challenge across synthesis, characterisation, and theory due to its inherent disorder and resulting complex structure - electronic structure relationship. Here, density functional theory is used in combination with a machine learning approach to screen nearly one million potential structures, thereby developing a robust atomistic model of the γ-phase. Theoretical results are compared with surface and bulk sensitive soft and hard X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, spectroscopic ellipsometry, and photoluminescence excitation spectroscopy experiments representative of the occupied and unoccupied states of γ-Ga2O3. The first onset of strong absorption at room temperature is found at 5.1 eV from spectroscopic ellipsometry, which agrees well with the excitation maximum at 5.17 eV obtained by PLE spectroscopy, where the latter shifts to 5.33 eV at 5 K. This work presents a leap forward in the treatment of complex, disordered oxides and is a crucial step towards exploring how their electronic structure can be understood in terms of local coordination and overall structure. Copyright © 2022, The Authors. All rights reserved.

关键词： Density functional theory

Advances in space quantum communications

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arXiv 2021年

作者： Sidhu, Jasminder S. Joshi, Siddarth K. Gündogan, Mustafa Brougham, Thomas Lowndes, David Mazzarella, Luca Krutzik, Markus Mohapatra, Sonali Dequal, Daniele Vallone, Giuseppe Villoresi, Paolo Ling, Alexander Jennewein, Thomas Mohageg, Makan Rarity, John Fuentes, Ivette Pirandola, Stefano Oi, Daniel K.L. SUPA Department of Physics University of Strathclyde 107 Rottenrow GlasgowG4 0NG United Kingdom Quantum Engineering Technology Labs H. H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol Merchant Venturers Building Woodland Road BristolBS8 1UB United Kingdom Institüt für Physik Humboldt-Universität zu Berlin Newtonstr. 15 Berlin12489 Germany Jet Propulsion Laboratory California Institute of Technology United States Scientific Research Unit Agenzia Spaziale Italiana Matera Italy Dipartimento di Ingegneria dell'Informazione Università degli Studi di Padova Padova35131 Italy Dipartimento di Fisica e Astronomia Università degli Studi di Padova Padova35131 Italy Centre for Quantum Technologies National University of Singapore S15-02-10 3 Science Drive 2 Singapore117543 Singapore Department of Physics 2 Science Drive 3 Blk S12 Level 2 Singapore117551 Singapore Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada School of Physics and Astronomy University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Computer Science University of York YorkYO10 5GH United Kingdom Craft Prospect Ltd. Suite 4A Fairfield 1048 Govan Road GlasgowG51 4XS United Kingdom

Concerted efforts are underway to establish an infrastructure for a global quantum internet to realise a spectrum of quantum technologies. This will enable more precise sensors, secure communications, and faster data processing. Quantum communications are a front-runner with quantum networks already implemented in several metropolitan areas. A number of recent proposals have modelled the use of space segments to overcome range limitations of purely terrestrial networks. Rapid progress in the design of quantum devices have enabled their deployment in space for in-orbit demonstrations. We review developments in this emerging area of space-based quantum technologies and provide a roadmap of key milestones towards a complete, global quantum networked landscape. Small satellites hold increasing promise to provide a cost effective coverage required to realised the quantum internet. We review the state of art in small satellite missions and collate the most current in-field demonstrations of quantum cryptography. We summarise important challenges in space quantum technologies that must be overcome and recent efforts to mitigate their effects. A perspective on future developments that would improve the performance of space quantum communications is included. We conclude with a discussion on fundamental physics experiments that could take advantage of a global, space-based quantum network. Copyright © 2021, The Authors. All rights reserved.

关键词： Quantum cryptography

From FAIR to CURE: Guidelines for Computational Models of Biological Systems

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arXiv 2025年

作者： Sauro, Herbert M. Agmon, Eran Blinov, Michael L. Gennari, John H. Hellerstein, Joe Heydarabadipour, Adel Hunter, Peter Jardine, Bartholomew E. May, Elebeoba Nickerson, David P. Smith, Lucian P. Bader, Gary D. Bergmann, Frank Boyle, Patrick M. Dräger, Andreas Faeder, James R. Feng, Song Freire, Juliana Fröhlich, Fabian Glazier, James A. Gorochowski, Thomas E. Helikar, Tomas Hoops, Stefan Imoukhuede, Princess Keating, Sarah M. Konig, Matthias Laubenbacher, Reinhard Loew, Leslie M. Lopez, Carlos F. Lytton, William W. McCulloch, Andrew Mendes, Pedro Myers, Chris J. Myers, Jerry G. Mulugeta, Lealem Niarakis, Anna van Niekerk, David D. Olivier, Brett G. Patrie, Alexander A. Quardokus, Ellen M. Radde, Nicole Rohwer, Johann M. Sahle, Sven Schaff, James C. Sego, T.J. Shin, Janis Snoep, Jacky L. Vadigepalli, Rajanikanth Wiley, H. Steve Waltemath, Dagmar Moraru, Ion Department of Bioengineering University of Washington SeattleWA98195-5061 United States Intelligent Systems Engineering and Biocomplexity Institute Indiana University Street BloomingtonIN47408 United States Center for Cardiovascular Biology University of Washington SeattleWA98195-5061 United States eScience Institute University of Washington SeattleWA98195-5061 United States Institute for Stem Cell and Regenerative Medicine University of Washington SeattleWA98195-5061 United States School of Biological Sciences University of Bristol 24 Tyndall Avenue BristolBS8 1TQ United Kingdom Departments of Physiology & Pharmacology Neurology Downstate Health Science University BrooklynNY11203 United States Department of Neurology Kings County Hospital BrooklynNY11203 United States NASA-John H. Glenn Research Center MS 110-3 21000 Brookpark Road ClevelandOH44135 United States Center for Cell Analysis and Modeling UConn Health 263 Farmington Avenue FarmingtonCT06030-6406 United States Amsterdam Institute for Life and Environment Vrije Universiteit Amsterdam De Boelelaan 1108 Amsterdam1081 HZ Netherlands Department of Pathology and Genomic Medicine Thomas Jefferson University 1020 Locust St PhiladelphiaPA19107 United States Biological Sciences Division Pacific Northwest National Laboratory 902 Battelle Blvd RichlandWA99354 United States Auckland Bioengineering Institute University of Auckland Auckland1010 New Zealand Center of Integrative Biology University of Toulouse III-Paul Sabatier 165 Rue Marianne Grunberg-Manago Toulouse31400 France Lifeware Group Inria Building Alan Turing 1 Rue Honoré d’Estienne d’Orves Palaiseau91120 France Multiscale Modeling Group Altos Labs Redwood CityCA94065 United States partner site Tübingen Tübingen Germany Ottfried-Müller-Str. 37 Tübingen72076 Germany 06120 Germany Department of Computer Science Center for Data Science New York University New YorkNY11201 United States Department of Bi

Guidelines for managing scientific data have been established under the FAIR principles requiring that data be Findable, Accessible, Interoperable, and Reusable. In many scientific disciplines, especially computational biology, both data and models are key to progress. For this reason, and recognizing that such models are a very special type of "data", we argue that computational models, especially mechanistic models prevalent in medicine, physiology and systems biology, deserve a complementary set of guidelines. We propose the CURE principles, emphasizing that models should be Credible, Understandable, Reproducible, and Extensible. We delve into each principle, discussing verification, validation, and uncertainty quantification for model credibility;the clarity of model descriptions and annotations for understandability;adherence to standards and open science practices for reproducibility;and the use of open standards and modular code for extensibility and reuse. We outline recommended and baseline requirements for each aspect of CURE, aiming to enhance the impact and trustworthiness of computational models, particularly in biomedical applications where credibility is paramount. Our perspective underscores the need for a more disciplined approach to modeling, aligning with emerging trends such as Digital Twins and emphasizing the importance of data and modeling standards for interoperability and reuse. Finally, we emphasize that given the non-trivial effort required to implement the guidelines, the community moves to automate as many of the guidelines as possible. © 2025, CC BY.

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Mobile robot localisation and navigation using LEGO NXT and ultrasonic sensor

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arXiv 2018年

作者： Liu, Yanan Fan, Rui Yu, Bin Junaid Bocus, M. Liu, Ming Ni, Hepeng Fan, Jiahe Mao, Shixin Bristol Robotics Laboratory University of Bristol Bristol United Kingdom Robotics and Multi-Perception Laboratory Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong Department of Electrical and Electronic Engineering University of Bristol BristolBS8 1UB United Kingdom School of Mechanical Engineering Shandong University Jinan250061 China School of Communication Engineering Jilin University Changchun130000 China Shenzhen Sanhang Industrial Technology Research Institute Shenzhen518000 China

Mobile robots are becoming increasingly important both for individuals and industries. Mobile robotic technology is not only utilised by experts in this field but is also very popular among amateurs. However, implementing a mobile robot to perform tasks autonomously can be expensive because of the need for various types of sensors and the high price of robot platforms. Hence, in this paper we present a mobile robot localisation and navigation system which uses a LEGO ultrasonic sensor in an indoor map based on the LEGO MINDSTORM NXT. This provides an affordable and ready-to-use option for most robot fans. In this paper, an effective method is proposed to extract useful information from the distorted readings collected by the ultrasonic sensor. Then, the particle filter is used to localise the robot. After robot's position is estimated, a sampling-based path planning method is proposed for the robot navigation. This method reduces the robot accumulative motion error by minimising robot turning times and covering distances. The robot localisation and navigation algorithms are implemented in MATLAB. Simulation results show an average accuracy between 1 and 3 cm for three different indoor map locations. Furthermore, experiments performed in a real setup show the effectiveness of the proposed methods. Copyright © 2018, The Authors. All rights reserved.

关键词： Mobile robots

Designing a Self-Optimization System for Cognitive Wireless Home Networks

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Designing a Self-Optimization System for Cognitive Wireless ...

作者： Meshkova, Elena Wang, Zhou Rerkrai, Krisakorn Ansari, Junaid Nasreddine, Jad Denkovski, Daniel Farnham, Tim Riihijarvi, Janne Gavrilovska, Liljana Mahonen, Petri Institute for Networked Systems RWTH Aachen University Aachen52072 Germany European Microsoft Innovation Centre Munich80538 Germany Department of Electrical and Computer Engineering Rafik Hariri University Mechref2010 Lebanon Faculty of Electrical Engineering Ss. Cyril and Methodius University of Skopje Skopje1000 Macedonia Telecommunications Research Laboratory Toshiba Research Europe Ltd. BristolBS1 4ND United Kingdom

In this paper, we describe the design and implementation of an extensible and flexible self-optimization framework for cognitive home networks that employs cognitive wireless networking and agent-based design principles. We provide a 'first-principles' derivation of its architecture based on a careful analysis of user requirements on wireless home networks (WHNs), state the related design objectives and constraints, and address those in the context of present-day and emerging radio platforms. We utilize the cognitive resource manager as an architecture of the individual agents. This architecture serves as a 'constraint that de-constrains,' i.e., it allows achieving high system flexibility, while providing structural constraints to ensure robustness. We show that the designed system is capable of solving complex utility maximization problems constrained with user, operator, and regulatory policies in the crowded ISM bands. The system successfully operates on an extensible parameter configuration space across multiple protocol layers. For example, the prototype employs diverse optimization algorithms, and can also benefit from radio environment map information on primary transmitters propagated through the integrated policy mechanism. The proposed system delivers both efficient and robust radio resource management, and enables comfortable WHN experimentation by providing extensibility of sensory inputs, actuation parameters, and optimization algorithms. © 2015 IEEE.

关键词： Home networks

Limitations of two-level emitters as nonlinearities in two-photon controlled-phase gates

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Physical Review A 2017年第6期95卷 062304-062304页

作者： Anders Nysteen Dara P. S. McCutcheon Mikkel Heuck Jesper Mørk Dirk R. Englund DTU Fotonik Department of Photonics Engineering Technical University of Denmark Building 343 2800 Kgs. Lyngby Denmark Quantum Engineering Technology Labs H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering University of Bristol Merchant Venturers Building Woodland Road Bristol BS8 1FD United Kingdom Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

We investigate the origin of imperfections in the fidelity of a two-photon controlled-phase gate based on two-level-emitter nonlinearities. We focus on a passive system that operates without external modulations to enhance its performance. We demonstrate that the fidelity of the gate is limited by opposing requirements on the input pulse width for one- and two-photon-scattering events. For one-photon scattering, the spectral pulse width must be narrow compared with the emitter linewidth, while two-photon-scattering processes require the pulse width and emitter linewidth to be comparable. We find that these opposing requirements limit the maximum fidelity of the two-photon controlled-phase gate to 84% for photons with Gaussian spectral profiles.

关键词： Quantum computation Quantum information architectures & platforms Quantum information with atoms & light