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IEEE Globecom Workshops

作者： Farwa Ansari Rana Asif Rehman Byung-Seo Kim Department of Computer Science National University of Computer and Emerging Sciences Chiniot-Faisalabad Campus Pakistan Department of Software and Communications Engineering Hongik University Sejong City South Korea

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

Software Defined Networking (SDN) is the more reliable and flexible networking architecture. Due to its programmable nature, it is getting more popular in every research domain of Computing. Moreover, Named Data Networking (NDN) architecture is also more beneficial and emerging technology of Internet. NDN focuses on the content name instead of its location and replaces the usage of IP addresses. Lot of research has been made to integrate SDN and NDN due to their benefits of better management-ability, flexibility, less complexity, centralized control, decoupled control and data planes etc. Mobile Ad Hoc Network (MANET) is also getting more popular due to huge advancement in Mobile communication devices. Combining SDN and NDN in MANET will resolve lots of problems (i.e. forwarding, mobility, management etc.) which are difficult to tackle with single architecture. Broadcast Storm is always a challenging issue in Ad Hoc networks like MANET. In this paper, we proposed a Controller based Selective Forwarding (CSF) scheme by merging SDN, NDN and MANET to overcome the Broadcast Storm Problem (BSP) and other issues caused by BSP. CSF is evaluated using different simulation parameters which shows superiority over the Native ND-MANET in reference to BSP.

关键词： Ad hoc networks Mobile computing Storms computer architecture IP networks Software Mobile handsets

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Traffic Modelling of Low Dense Femtocellular Network for Long Term Evolution

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Journal of computer and communications 2019年第12期7卷 88-101页

作者： Jesmin Akhter Abu Sayed Md. Mostafizur Rahaman Md. Imdadul Islam M. R. Amin Institute of Information Technology Jahangirnagar University Dhaka Bangladesh Department of Computer Science and Engineering Jahangirnagar University Dhaka Bangladesh Department of Electronics and Communications Engineering East West University Dhaka Bangladesh

One of the features of Long Term Evolution (LTE) is the deployment of femtocells as the underlain cell of a macrocell without any intervention of frequency planning to offload the traffic. In this paper we used Markov chain to derive the expression of blocking probability for both macro and femtocell in terms of traffic parameters of the network. We developed an analytical model to find the expression of probability of forced termination (FT) using combination of mobility model and probability tree considering low dense femtocellular network. Two different trees were designed: a newly originating call which starts its session in a femtocell and that of in a macro cell. The link parameters of small scale fading of wireless network under Multiple Input Multiple Output (MIMO) are combined with the proposed traffic model to get the probability of FT of a real-life network. A new state transition chain was also developed including its solution for LTE traffic of variable bandwidth (BW) and a comparison was made with Erlang’s traffic model.

关键词： Rayleigh and Nakagami-m Fading MIMO RB Forced Termination Outage Probability

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Correlation Analysis with Experimental Procedures and Peak Structures in Xps Spectral Round-Robin Tests on Mno Powder Sample

SSRN

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SSRN 2022年

作者： Murakami, Ryo Harada, Yoshitomo Sonobayashi, Yutaka Oji, Hiroshi Makino, Hisao Tanaka, Hiromi Taguchi, Hideyuki Sakamoto, Takanori Morita, Haruka Wakamori, Akihiko Kibe, Naoko Nishida, Shinsuke Nagata, Kenji Shinotsuka, Hiroshi Shouno, Hayaru Yoshikawa, Hideki The University of Electro-Communications Graduate School of Informatics and Engineering Chofu182-8585 Japan National Institute for Materials Science Research and Services Division of Materials Data and Integrated System Ibaraki Tsukuba305-0044 Japan Kyoto University Department of Materials Science and Engineering Kyoto606-8501 Japan Nagoya University Synchrotron radiation Research center Nagoya464-8603 Japan Kochi University of Technology School of Systems Engineering Japan National Institute of Technology Yonago College Department of Electrical and Computer Engineering Japan Nihon Parkerizing Co. Ltd Central Research Laboratories Kanagawa 254-0012 Japan JX Nippon Mining & Metals Corporation Technology Development Center Japan Melco Semiconductor Engineering Corporation Chemical Analysis & Evaluation Engineering Dept. Fukuoka Japan Kobelco Welding TechnoSolutions Co. Technical Solution Dept. Ltd Kanagawa 251-8551 Japan Furukawa Electric Co. Ltd Analysis Technology Center Sustainable Technology Laboratorie Kanagawa 220-0073 Japan

Spectral measurements provide valuable information on the electronic states and crystal structures of materials. In particular, X-ray photoelectron spectroscopy (XPS) can facilitate analysis of the chemical bond state of material surfaces. In the analysis of XPS spectra, the spectrum to be measured is typically compared to a reference spectrum measured on a known single-phase sample. Therefore, establishing a reference spectral database is imperative. In this study, round-robin tests of XPS spectra are performed with the aim of obtaining recommended XPS reference spectra and experimental procedures, including preprocessing. Determining the variations in peak structures between instrument- and sample-derived spectral shapes, and quantitatively discussing them in round-robin tests of XPS spectra are challenging. Therefore, an analysis method that automatically determines the above mentioned variations and extracts the samplederived common spectral structures is developed. This study presents a new approach to the quantitative analysis of round-robin tests of XPS spectra. The required common © 2022, The Authors. All rights reserved.

关键词： X ray photoelectron spectroscopy

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Accelerating NATO Transformation with SnTEE: Experiments with Network Security Function Virtualization in Coalition Networks

Accelerating NATO Transformation with SnTEE: Experiments wit...

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International Conference on Military communications and Information Systems (ICMCIS)

作者： Roberto Rigolin F. Lopes Johannes F. Loevenich Konrad Wrona Paulo H. L. Rettore Jerry Falkcrona Joseph Mathews Nils Nordbotten Bogdan Vasilache Thorsten Lampe Olwen L. Worthington Juha Röning Secure Communications & Information (SIX) Thales Deutschland Ditzingen Germany Department of Mathematics/Computer Science University of Osnabrück Osnabrück Germany NATO Cyber Security Centre The Hague Netherlands Military University of Technology Warsaw Poland Communication Systems (KOM) Fraunhofer FKIE Bonn Germany Cyber Defence and C2 Technology Swedish Defence Research Agency Linköping Sweden Information Technology Division U.S. Naval Research Laboratory Washington DC USA Thales Norway Oslo Norway WonderBit B.V. Almere The Netherlands Defence Science and Technology Laboratory (Dstl) UK Ministry of Defence London United Kingdom Information Technology and Electrical Engineering University of Oulu Oulu Finland

This paper introduces a virtual laboratory for experiments with cybersecurity functions in coalition networks. The motivation comes from the NATO Allied Command Transformation (ACT) initiative on Science and Technology Experimentation Environment (SnTEE), which supports the transfer of scientific and technical activities carried out by the NATO Science and Technology Organization (STO) research task groups towards NATO operations. The goal of the experiments reported in this paper is to emulate a network topology inspired by Protected Core Networking (PCN), which defines two interfaces. One interface between two protected core segments, from different nations, and another interface between a protected core segment and a colored cloud within a particular nation. The experiments are intended to support the investigation performed by the STO IST-196 RTG on Cyber Security in Virtualized Networks. In particular, the starting hypothesis of IST-196 is that security function virtualization can support/speedup PCN topology changes when links are added/removed. We define our experimental setup as Infrastructure as Code (IaC) and introduce experiments that emulate topology changes. We also sketch a solution for the deployment of two chains of virtualized cybersecurity functions at lower protocol layers (physical and IP) and at higher protocol layers (transport and application). This paper also lists future experiments for the NATO SnTEE lab, namely risk-aware routing, cross-layer enforcement of policies, information exchange functions, and federate monitoring and detection of cyber incidents/attacks.

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Frequency- And Bandwidth-Tunable Absorptive Bandpass Filter

Frequency- And Bandwidth-Tunable Absorptive Bandpass Filter

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作者： Jeong, Seong-Wook Lee, Tae-Hak Lee, Juseop Department of Computer and Communications Engineering Korea University Seoul 02841 Korea Republic of Poly-Grames Research Center École Polytechnique de Montréal Montreal QC H3T 1J4 Canada

In this paper, an analytic design method for a frequency- and bandwidth-tunable absorptive bandpass filter is introduced. The presented design method relies on the transformation from the normalized absorptive low-pass filter prototype to a bandpass filter structure with parallel resonators and admittance inverters. The inverter values for producing a predefined frequency response are given in closed-form expressions so that a filter design needs no heuristic approach and can be carried out in an analytic manner. This work also presents a new tunable stub resonator structure capable of changing not only its resonant frequency but also the slope parameter. As the slope parameter can be adjusted, it is allowed to use static inverters in designing a filter whose bandwidth can be tuned. For demonstrating our design method for a reconfigurable absorptive bandpass filter, a third-order filter having the target to have the frequency tuning range from 1.35 to 1.65 GHz and the bandwidth tuning range from 5% to 10% has been designed and measured. © 2019 IEEE.

关键词： Bandpass filters

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Beamforming Technologies for Ultra-Massive MIMO in Terahertz communications

arXiv

引用

arXiv 2021年

作者： Ning, Boyu Tian, Zhongbao Mei, Weidong Chen, Zhi Han, Chong Li, Shaoqian Yuan, Jinhong Zhang, Rui National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China Chengdu611731 China Laboratory Shanghai Jiao Tong University Shanghai200240 China University of New South Wales Australia Chinese University of Hong Kong Shenzhen Shenzhen Research Institute of Big Data Shenzhen518172 China Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore

Terahertz (THz) communications with a frequency band 0.1 − 10 THz are envisioned as a promising solution to future high-speed wireless communication. Although with tens of gigahertz available bandwidth, THz signals suffer from severe free-spreading loss and molecular-absorption loss, which limit the wireless transmission distance. To compensate for the propagation loss, the ultra-massive multiple-input-multiple-output (UM-MIMO) can be applied to generate a high-gain directional beam by beamforming technologies. In this paper, a review of beamforming technologies for THz UM-MIMO systems is provided. Specifically, we first present the system model of THz UM-MIMO and identify its channel parameters and architecture types. Then, we illustrate the basic principles of beamforming via UM-MIMO and discuss the far-field and near-field assumptions in THz UM-MIMO. Moreover, an important beamforming strategy in THz band, i.e., beam training, is introduced wherein the beam training protocol and codebook design approaches are summarized. The intelligent-reflecting-surface (IRS)-assisted joint beamforming and multi-user beamforming in THz UM-MIMO systems are studied, respectively. The spatial-wideband effect and frequency-wideband effect in the THz beamforming are analyzed and the corresponding solutions are provided. Further, we present the corresponding fabrication techniques and illuminate the emerging applications benefiting from THz beamforming. Open challenges and future research directions on THz UM-MIMO systems are finally highlighted. Copyright © 2021, The Authors. All rights reserved.

关键词： Beamforming

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Chiral symmetry and taste symmetry from the eigenvalue spectrum of staggered Dirac operators

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Physical Review D 2021年第1期104卷 014508-014508页

作者： Hwancheol Jeong Chulwoo Jung Seungyeob Jwa Jangho Kim Jeehun Kim Nam Soo Kim Sunghee Kim Sunkyu Lee Weonjong Lee Youngjo Lee Jeonghwan Pak Lattice Gauge Theory Research Center FPRD and CTP Department of Physics and Astronomy Seoul National University Seoul 08826 South Korea Physics Department Brookhaven National Laboratory Upton New York 11973 USA Institut für Theoretische Physik Goethe University Frankfurt am Main Max-von-Laue-Str. 1 60438 Frankfurt am Main Germany Department of Electrical and Computer Engineering and the Institute of New Media and Communications Seoul National University Seoul 08826 South Korea Department of Statistics Seoul National University Seoul 08826 South Korea

We investigate general properties of the eigenvalue spectrum for improved staggered quarks. We introduce a new chirality operator [γ5⊗1] and a new shift operator [1⊗ξ5], which respect the same recursion relation as the γ5 operator in the continuum. Then we show that matrix elements of the chirality operator sandwiched between two eigenstates of the staggered Dirac operator are related to those of the shift operator by the Ward identity of the conserved U(1)A symmetry of staggered fermion actions. We perform a numerical study in quenched QCD using HYP staggered quarks to demonstrate the Ward identity. We introduce a new concept of leakage patterns which collectively represent the matrix elements of the chirality operator and the shift operator sandwiched between two eigenstates of the staggered Dirac operator. The leakage pattern provides a new method to identify zero modes and nonzero modes in the Dirac eigenvalue spectrum. This method is as robust as the spectral flow method but requires much less computing power. Analysis using a machine learning technique confirms that the leakage pattern is universal, since the staggered Dirac eigenmodes on normal gauge configurations respect it. In addition, the leakage pattern can be used to determine a ratio of renormalization factors as a by-product. We conclude that it might be possible and realistic to measure the topological charge Q using the Atiya-Singer index theorem and the leakage pattern of the chirality operator in the staggered fermion formalism.

关键词： Gauge theories Lattice field theory

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Channel aware sparse transmission for ultra low-latency communications in TDD systems

arXiv

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arXiv 2019年

作者： Kim, Wonjun Ji, Hyoungju Shim, Byonghyo Institute of New Media and Communications Department of Electrical and Computer Engineering Seoul National University Seoul Korea Republic of

Major goal of ultra reliable and low latency communication (URLLC) is to reduce the latency down to a millisecond (ms) level while ensuring reliability of the transmission. Since the current uplink transmission scheme requires a complicated handshaking procedure to initiate the transmission, to meet this stringent latency requirement is a challenge in wireless system design. In particular, in the time division duplexing (TDD) systems, supporting the URLLC is difficult since the mobile device has to wait until the transmit direction is switched to the uplink. In this paper, we propose a new approach to support a low latency access in TDD systems, called channel aware sparse transmission (CAST). Key idea of the proposed scheme is to encode a grant signal in a form of sparse vector. This together with the fact that the sensing mechanism preserves the energy of the sparse vector allows us to use the compressed sensing (CS) technique in CAST decoding. From the performance analysis and numerical evaluations, we demonstrate that the proposed CAST scheme achieves a significant reduction in access latency over the 4G LTE-TDD and 5G NR-TDD systems. Copyright © 2019, The Authors. All rights reserved.

关键词： Transmissions

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Exploiting Residual Edge Information in Deep Fully Convolutional Neural Networks For Retinal Vessel Segmentation

Exploiting Residual Edge Information in Deep Fully Convoluti...

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International Joint Conference on Neural Networks (IJCNN)

作者： Tariq M. Khan Syed S. Naqvi Muhammad Arsalan Muhamamd Aurangzeb Khan Haroon A. Khan Adnan Haider Faculty of Sci Eng & Built Env School of Info Technology Deakin University Victoria Australia Division of Electronics and Electrical Engineering Dongguk University Seoul Korea Computing and Communications Lancaster University Lancaster UK Department of Electrical and Computer Engineering COMSATS University Islamabad Islamabad Pakistan

ISBN: (数字)9781728169262

ISBN: (纸本)9781728169279

Accurate automatic segmentation of the retinal vessels is crucial for early detection and diagnosis of vision-threatening retinal diseases. A new supervised method using a variant of the fully convolutional neural network is pro-posed with the advantages of reduced hyper-parameters, reduced computational/memory requirements, and robust performance in capturing tiny vessel information. The fully convolutional architectures previously employed for vessel segmentation have multiple tunable hyperparameters and difficulty in end-to-end training due to their decoder structure. We resolve this problem by sharing information from the encoder for upsampling at the decoder stage, resulting in a significantly smaller number of tunable parameters and low computational overhead at the train and test stages. Moreover, the need for pre- and post-processing steps are eradicated. Consequently, the detection accuracy is significantly improved with scores of 0.9620, 0.9623, and 0.9620 on DRIVE, STARE, and CHASE_DB1 datasets respectively.

关键词： Image segmentation Decoding Training computer architecture Retinal vessels Task analysis

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Toward autonomous reconfigurable intelligent surfaces through wireless energy harvesting

arXiv

引用

arXiv 2021年

作者： Ntontin, Konstantinos Alexandros-Apostolos, A. Boulogeorgos Björnson, Emil Selimis, Dimitrios Martins, Wallace Alves Kisseleff, Steven Abadal, Sergi Alarcón, Eduard Papazafeiropoulos, Anastasios Lazarakis, Fotis Alexiou, Angeliki Chatzinotas, Symeon University of Luxembourg L-1855 Luxembourg The Department of Digital Systems University of Piraeus Piraeus18534 Greece The Department of Electrical Engineering Linköping University Linköping581 83 Sweden The Department of Computer Science KTH Kista164 40 Sweden The Wireless Communications Laboratory The Institute of Informatics and Telecommunications National Centre for Scientific Research-Demokritos Athens Greece Universitat Politècnica de Catalunya Barcelona08034 Spain The Communications and Intelligent Systems Research Group University of Hertfordshire Hatfield AL10 9AB United Kingdom The SnT University of Luxembourg Luxembourg City4365 Luxembourg

In this work, we examine the potential of autonomous operation of a reconfigurable intelligent surface (RIS) using wireless energy harvesting from information signals. To this end, we first identify the main RIS power-consuming components and introduce a suitable power-consumption model. Subsequently, we introduce a novel RIS power-splitting architecture that enables simultaneous energy harvesting and beamsteering. Specifically, a subset of the RIS unit cells (UCs) is used for beamsteering while the remaining ones absorb energy. For the subset allocation, we propose policies obtained as solutions to two optimization problems. The first problem aims at maximizing the signal-to-noise ratio (SNR) at the receiver without violating the RIS's energy harvesting demands. Additionally, the objective of the second problem is to maximize the RIS harvested power, while ensuring an acceptable SNR at the receiver. We prove that under particular propagation conditions, some of the proposed policies deliver the optimal solution of the two problems. Furthermore, we report numerical results that reveal the efficiency of the policies with respect to the optimal and very high-complexity brute-force design approach. Finally, through a case study of user tracking, we showcase that the RIS power-consumption demands can be secured by harvesting energy from information signals. Copyright © 2021, The Authors. All rights reserved.

关键词： Energy harvesting

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