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IEEE International Conference on Communications (ICC)

作者： Qianpeng Wang Deyun Gao Chuan Heng Foh Victor C.M. Leung National Engineering Laboratory for Next Generation Internet Technologies School of Electronic and Information Engineering Beijing Jiaotong University Beijing China 5GIC Institute for Communication Systems (ICS) University of Surrey Guildford Surrey U.K Dept. of Electrical and Computer Engineering The University of British Columbia Vancouver B.C Canada

ISBN: (数字)9781728150895

ISBN: (纸本)9781728150901

The problem of security and privacy in vehicular networks is a vital issue and it attracts increasing attention to address the security vulnerability of vehicular networks. Authentication solutions are introduced in vehicular networks to ensure that network access only comes from authorized users. Particularly, group signature not only offers authentication services in vehicular networks, but also provides conditional privacy preservation. However, the current group signature solution for authentication in vehicular networks exhibits time-consuming signature verification, which is attributed to the centralized certificate revocation list (CRL) management. To overcome this shortcoming, we propose utilizing edge computing approach and design a flexible and efficient decentralized authentication scheme (FEDAS). In the proposed architecture, a decentralized CRL management method is developed to reduce verification delay in the authentication process. In addition, transition zone is proposed to solve reliable authentication problem in border area of the group caused by decentralized architecture. We also conduct extensive simulations to show the effectiveness of our proposed scheme.

关键词： Authentication computer architecture Delays Edge computing Privacy Protocols

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Application of Agent-Based Modelling to Simulate Ribosome Translation 18th

Application of Agent-Based Modelling to Simulate Ribosome Tr...

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18th International Conference on Practical Applications of Agents and Multi-Agent systems, PAAMS 2020

作者： Pérez-Rodríguez, Gael Magalhães, Beatriz T. Azevedo, Nuno F. Lourenço, Anália ESEI Department of Computer Science University of Vigo Edificio Politécnico Campus Universitario As Lagoas s/n Ourense32004 Spain CINBIO The Biomedical Research Centre University of Vigo Campus Univesitario Lagoas-Marcosende Vigo36310 Spain SING Next Generation Computer Systems Group Galicia Sur Health Research Institute SERGAS-UVIGO Vigo Spain LEPABE Department of Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal CEB Centre of Biological Engineering University of Minho Campus de Gualtar Braga4710-057 Portugal

ISBN: (纸本)9783030497774

Translation is a key process in the cell that encompasses the formation of proteins. However, how the translation mechanisms are affected by physiological changes is yet to be determined. Saccharomyces cerevisiae is one of the most used microorganisms to express recombinant proteins, showing great industrial/commercial value. Modelling the translation process in this yeast can thus bring forward novel insights into its mechanisms and how they are affected by changes in the environment. The present work introduces an agent-based model describing the elongation step of the translation process in the yeast. The simulated and theoretical elongation times were almost identical, with a standard deviation of 0.0018%, demonstrating the usefulness of the model to simulate this type of scenarios. Results also show a negative correlation between tRNA levels and estimated decoding times of codons, in accordance with biological knowledge. The model holds considerable potential to help unveil new ways of manipulation and thus increase the production of economically relevant yeast-derived products, namely biopharmaceuticals. Further development will address more complex scenarios, such as ribosome queuing or all the phases in the translation process. © 2020, Springer Nature Switzerland AG.

关键词： Yeast

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Grant-free opportunistic uplink transmission in wireless-powered IoT: A spatio-temporal model

arXiv

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arXiv 2020年

作者： Gharbieh, Mohammad ElSawy, Hesham Emara, Mustafa Yang, Hong-Chuan Alouini, Mohamed-Slim Department of Electrical and Computer Engineering University of Victoria VictoriaBCV8P 5C2 Canada Dhahran31261 Saudi Arabia Germany standards R&D team Next Generation and Standards Intel Deutschland GmbH Institute of Communications Hamburg University of Technology Hamburg21073 Germany Thuwal23955 Saudi Arabia

Ambient radio frequency (RF) energy harvesting is widely promoted as an enabler for wireless-power Internet of Things (IoT) networks. This paper jointly characterizes energy harvesting and packet transmissions in grant-free opportunistic uplink IoT networks energized via harvesting downlink energy. To do that, a joint queuing theory and stochastic geometry model is utilized to develop a spatio-temporal analytical model. Particularly, the harvested energy and packet transmission success probability are characterized using tools from stochastic geometry. Moreover, each device is modeled using a two-dimensional discrete-time Markov chain (DTMC). Such two dimensions are utilized to jointly track the scavenged/depleted energy to/from the batteries along with the arrival/departure of packets to/from devices buffers over time. Consequently, the adopted queuing model represents the devices as spatially interacting queues. To that end, the network performance is assessed in light of the packet throughput, the average delay, and the average buffer size. The effect of base stations (BSs) densification is discussed and several design insights are provided. The results show that the parameters for uplink power control and opportunistic channel access should be jointly optimized to maximize average network packet throughput, and hence, minimize delay. © 2020, CC-BY.

关键词： Energy harvesting

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A sparse representation based joint demosaicing method for single-chip polarized color sensor

arXiv

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arXiv 2019年

作者： Wen, Sijia Zheng, Yinqiang Lu, Feng The State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing100191 China The Next Generation Artificial Intelligence Research Center The University of Tokyo Tokyo113-8656 Japan

The emergence of the single-chip polarized color sensor now allows for simultaneously capturing chromatic and polarimetric information of the scene on a monochromatic image plane. However, unlike the usual camera with an embedded demosaicing method, the latest polarized color camera is not delivered with an in-built demosaicing tool. For demosaicing, the users have to down-sample the captured images or to use traditional interpolation techniques. Neither of them can perform well since the polarization and color are interdependent. Therefore, joint chromatic and polarimetric demosaicing is the key to obtaining high-quality polarized color images. In this paper, we propose a joint chromatic and polarimetric demosaicing model to address this challenging problem. Instead of mechanically demosaicing for the multi-channel polarized color image, we further present a sparse representation-based optimization strategy that utilizes chromatic information and polarimetric information to jointly optimize the model. To avoid the interaction between color and polarization during demosaicing, we separately construct the corresponding dictionaries. We also build an optical data acquisition system to collect a dataset, which contains various sources of polarization, such as illumination, reflectance and birefringence. Results of both qualitative and quantitative experiments have shown that our method is capable of faithfully recovering full RGB information of four polarization angles for each pixel from a single mosaic input image. Moreover, the proposed method can perform well not only on the synthetic data but the real captured data. Copyright © 2019, The Authors. All rights reserved.

关键词： Global optimization

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Sputtered Aluminum Oxide and p+ Amorphous Silicon Back-Contact for Improved Hole Extraction in Polycrystalline CdSexTe1-x and CdTe Photovoltaics

Sputtered Aluminum Oxide and p+ Amorphous Silicon Back-Conta...

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IEEE Conference on Photovoltaic Specialists

作者： Adam Danielson Amit Munshi Arthur Onno William Weigand Anna Kindvall Carey Reich Zhengshan J. Yu Jianwei Shi Darius Kuciauskas Ali Abbas John M. Walls Zachary Holman Walajabad Sampath NGPV (Next Generation PV Center) Colorado State University Fort Collins CO United States School of Electrical Computer and Energy Engineering Arizona State University Tempe United States National Renewable Energy Laboratory Golden Colorado United States Centre for Renewable Energy Systems Technology Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough University Loughborough United Kingdom

A thin layer of Al 2 O 3 at the back of CdSe x T e1-x /CdTe devices is shown to passivate the back interface and drastically improve surface recombination lifetimes and photoluminescent response. Despite this, such devices do not show an improvement in open-circuit voltage (V OC. ) Adding a p + amorphous silicon layer behind the Al 2 O 3 bends the conduction band upward, reducing the barrier to hole extraction and improving collection. Further optimization of the Al 2 O 3 , amorphous silicon (a-Si), and indium-doped tin oxide (ITO) layers, as well as their interaction with the CdCl 2 passivation process, are necessary to translate these electro-optical improvements into gains in voltage.

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Modeling and Operation of the Power-to-Gas System for Renewables Integration: A Review

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CSEE Journal of Power and Energy systems 2018年第2期4卷 168-178页

作者： Xuetao Xing Jin Lin Yonghua Song You Zhou Shujun Mu Qiang Hu State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering University of MacaoMacaoChina Department of Electrical Engineering Tsinghua UniversityBeijing 100084China National Institute of Clean and Low Carbon Energy Beijing 102211China Tsinghua-Sichuan Energy Internet Research Institute Chengdu 610213China

Power-to-Gas(P2G)plays an important role in enhancing large-scale renewable energy integration in power *** an emerging inter-disciplinary subject,P2G technology requires knowledge in electrochemistry,electrical engineering,thermodynamic engineering,chemical engineering and system *** at P2G modeling and operational problems concerning the research field of power systems and the energy internet,this paper briefly reviews the main technologies and application potentials of the P2G system,and makes systematic summaries of major progresses related to P2G’s integration into the power grid in a bottom-top manner,including the modeling of high/room-temperature electrolysis cells,steady-state/dynamic optimization control of the P2G system,P2G’s integrated model and operational strategies at the grid *** the final part of this paper,suggestions are put forward on future research directions of P2G systems from the aspects of modeling and operational optimization.

关键词： Electrolysis cell multi-energy network modeling and operation power-to-gas

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Overview for the 37th WWRF Meeting

Overview for the 37th WWRF Meeting

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作者： Papathanassiou, Apostolos Sheen, Wern-Ho Wang, Chin-Liang Politis, Christos Next Generation and Standards Intel Client and Internet of Things Businesses and Systems Architecture Group Technology Development and Standardization Activities United States Department of Communications Engineering Georgia Institute of Technology National Chung Cheng University Atlanta United States Department of Electrical Engineering Institute of Communications Engineering National Tsing Hua University Taiwan National Technical University of Athens School of Computer Science Kingston University United Kingdom

Members of industry and academics discussed future mobile-radio standard fifth-generation (5G) technology at the 37th Wireless World Research Forum (WWRF) meeting, held 5/7 October 2016 in Kassel, Germany. International industrial representatives and scientists from 15 countries participated in 19 plenary talks, 16 working-group sessions, and two comprehensive tutorials on key 5G technologies. The experts discussed the current status, market potentials, and technical standards of 5G technology. The program included talks on connected vehicles, mobile health services, next-generation Ethernet-based fronthaul/xhaul, the Internet of Things (IoT), and an outlook beyond 5G. Working-group sessions addressed user needs and requirements, services and devices of 5G technology, new directions in communication architectures, and technologies, including high-frequency technologies. Highlights included the talks. © 2005-2012 IEEE.

关键词： Internet of things

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Impedance Modeling and Stability Analysis of Dual-Active Bridge Converter Interfacing DC Grids 10

Impedance Modeling and Stability Analysis of Dual-Active Bri...

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10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018

作者： Hu, Jingxin An, Zheng Cui, Shenghui Averous, Nurhan Rizqy De Doncker, Rik W. FEN Research Campus Institute for Power Generation and Storage Systems E.ON Energy Research Center RWTH Aachen University Aachen Germany Center for Distributed Energy School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta United States

ISBN: (纸本)9781479973118

As a key enabling component, high-power three-phase dual-active bridge (DAB3) converters are widely used to interface sources and loads to dc grids. However, with different control objectives and converter design parameters, the interconnected DAB3 converters could induce interactions that degrade the system stability. To address this issue, this paper presents a comprehensive impedance-based stability analysis method for DAB3 converter interfacing dc grids. The small-signal model of the DAB3 converter is firstly developed whereby the digital controllers for the voltage-controlled and current-controlled DAB3 converters are designed. Thereby, the output impedances of DAB3 converters are calculated, and a sensitivity analysis is performed to understand the influences of the controller bandwidth and the dc filter capacitance. With the obtained impedances, three different impedance-based stability criteria are investigated to analyze a dc system with two interconnected DAB3 converters. The unified stability criterion can determine the system stability accurately, while the gain margin and phase margin criterion can not only identify the low-frequency resonance intuitively, but also assist the design of control parameters and the filter capacitance. Time-domain simulation results are presented to validate the effectiveness and accuracy of the modeling and analysis method. © 2018 IEEE.

关键词： Capacitance

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Scenario challenges for next generation aviation technology demonstrations

Scenario challenges for next generation aviation technology ...

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AIAA Modeling and Simulation Technologies Conference, 2018

作者： Moallemi, Mohammad Jafer, Shafagh Chhaya, Bharvi Castro, Carlos A. Embry-Riddle Aeronautical University Daytona BeachFL32114-3900 United States Next Generation Applied Research Lab Embry-Riddle Aeronautical University Daytona Beach Campus Sim Bldg 127 600 S Clyde Morris Blvd Daytona BeachFL32114-3900 United States Department of Electrical Computer Software and Systems Engineering Embry-Riddle Aeronautical University Daytona Beach Campus Lehman 343 600 S Clyde Morris Blvd Daytona BeachFL32114-3900 United States

ISBN: (纸本)9781624105289

The Federal Aviation Administration’s (FAA) next generation Air Transportation System (nextGen) program is a long-term modernization and transformation of the current National Airspace System (NAS) into a more efficient and coordinated decision-making system. In order to test the key concepts and methods proposed by FAA and affiliated standard organizations such as RTCA (Radio Technical Commission for Aeronautics), Modeling and Simulation (M&S)-based demonstration of the solutions are employed in the early stages for the verification and validation of concepts and their technologies. With the help of model-based and simulation-based engineering, large-scale systems integration and demonstrations take place seamlessly. This demands for common understanding of simulation scenarios, allowing for cross-platform interoperability. A major challenge facing the development and testing of the demonstrations is the lack of standard scenario definition language bridging the gap between the operational team (controllers, pilots, and dispatchers) and the engineering community. This paper will tackle aviation scenario generation challenges using the recently proposed Aviation Scenario Definition Language (ASDL). ASDL aims at providing a standard scenario specification that leads to a common mechanism for verifying and executing aviation scenarios, effective sharing of scenarios among various simulation environments, improve the consistency among different stakeholders and entities and enable the reuse of scenario specifications. Based on Domain-Specific Language (DSL) design methodologies, current version of ASDL provides a well-structured definition language to define various flight operations scenarios. In this paper, a number of scenarios that have been implemented in previous FAA funded projects, including scenarios of 4 Dimensional trajectory operations as well as unmanned aerial system operations will be presented and an equivalent ASDL generated scenario script will be pro

关键词： Decision making

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Nonlinear digital self-interference cancellation with reduced complexity for full duplex systems 21

Nonlinear digital self-interference cancellation with reduce...

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21st International ITG Workshop on Smart Antennas, WSA 2017

作者： Emara, Mustafa Roth, Kilian Baltar, Leonardo G. Faerber, Michael Nossek, Josef A. Next Generation and Standards Intel Deutschland GmbH Neubiberg Germany Department of Electrical and Computer Engineering Technical University Munich Munich Germany Department of Teleinformatics Engineering Federal University of Ceara Fortaleza Brazil

ISBN: (纸本)9783800743940

Full duplex transmission is currently viewed as an important technology component for the future 5G and beyond mobile broadband technology. In order to realize its promised theoretical gain, sufficient cancellation of the self-interference must be achieved. The focus throughout this work will be on the digital cancellation, which main target is to cancel the residual self-interference resulting from the insufficient analog cancellation due to hardware imperfections, along with non-linearities existing in the transmitter chain. A novel pre-transmission transformation based on the Cholesky decomposition is presented, that aims at enhancing the digital cancellation performance. A digital cancellation based on the transversal recursive least squares with the exploitation of the dichotomous coordinate descent algorithm to lower the computational complexity is presented. The analysis was extended to include the existence of a received signal of interest, while simultaneously canceling the self-interference signal. By means of numerical simulations, a performance evaluation was carried out and results showed that the level of residual interference after the digital canceler reaches the simulated noise floor power level. © 2017 VDE VERLAG GMBH.

关键词： 5G mobile communication systems

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