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Towards Software-Defined Tactical networks: Experiments and Challenges for Control Overhead

Towards Software-Defined Tactical Networks: Experiments and ...

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MILCOM, Military communications Conference

作者： Paulo H. L. Rettore Miodrag Djurica Roberto Rigolin F. Lopes Vinicius F. S. Mota Eelco Cramer Floris Drijver Johannes F. Loevenich Dept. of Communication Systems Fraunhofer FKIE Bonn Germany Dept. of Networks TNO The Hague Netherlands Secure Communications & Information (SIX) Thales Deutschland Ditzingen Germany Dept. of Computer Science Federal University of Espirito Santo Vitória Brazil

Software-defined Tactical networks (SDTNs) have the potential to host intelligent mechanisms to manage ever-changing communication scenarios in networks with heterogeneous radio links. However, standard SDN protocols, like Open-Flow, were designed for non-mobile, reliable, high throughput, and low latency networks. This fact motivated the present investigation, reporting experimental results to quantify OpenFlow's control overhead in two different network scenarios i) stable conditions with wired links and static nodes, and ii) a topology with mobile nodes in a vignette from the Anglova scenario. Our results suggest that standard OpenFlow has a poor performance over stable conditions and VHF radio links (i.e. high control overhead) and similar results were observed in a topology with nodes moving through challenging terrain. These experimental results support a discussion and an initial solution on open challenges towards SDTNs and how OpenFlow can adapt to different communication technologies, such as SatCom, UHF, and VHF by reducing the control overhead.

关键词： Military communication Protocols Network topology Standards organizations Organizations Radio links Throughput

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Loop optimization with tradeoff between cycle count and code size for DSP applications

Loop optimization with tradeoff between cycle count and code...

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European Signal Processing Conference (EUSIPCO)

作者： Bogong Su Jian Wang Rafi Rabipour Erh-Wen Hu Joseph Manzano Dept. of Computer Science The William Paterson University of New Jersey Wayne NJ USA Wireless Speech and Data Processing Nortel Networks St-Laurent QC Canada

Software pipelining is an effective technique to reduce cycle count by exploiting instruction level parallelism in loops. It has been implemented in most VLIW DSP compilers. However, software pipelining expands the code size due to the introduction of prelude and postlude. To address this problem, many VLIW DSP compilers include certain code size reduction features. During compilation, a user is given limited options of exercising these code reduction features. As a result, the tradeoff options between cycle count and code size are also limited. Yet today's software development often requires an optimum balance between code size and cycle count, which in turn requires a much wider tradeoff space. This paper presents a new heuristic code-size-constraint loop optimization approach to extend the tradeoff space. Preliminary experimental results indicate that the new approach can significantly widen the tradeoff space, thus providing DSP users with more flexibility to meet their various design criteria.

关键词： Digital signal processing Abstracts Pipeline processing Program processors

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Applications of Evolutionary Computing 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Stefano Cagnoni Colin G. Johnson Juan J. Romero Cardalda Elena Marchiori David W. Corne Jean-Arcady Meyer Agnès Guillot Jens Gottlieb Martin Middendorf Günther R. Raidl Emma Hart

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Cost-effectiveness Analysis of a Shifted Completely Connected Network for Massively Parallel computer Systems

Cost-effectiveness Analysis of a Shifted Completely Connecte...

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Computing Innovation, Intelligence, Technologies and Education (CIITE), International Conference on

作者： Mohammed N. M. Ali M. M. Hafizur Rahman Hejab Al Fawareh Dept. of Computer Science and Technology Xiamen University Malaysia Bandar Sunsuria Sepang Selangor Malaysia Dept. of Comp. Networks and Communications CCSIT King Faisal University Al Ahsa Al Hofuf Saudi Arabia School of Computing and Data Science Xiamen University Malaysia Bandar Sunsuria Sepang Selangor Malaysia

ISBN: (数字)9798350377286

ISBN: (纸本)9798350377293

The Cost-Effectiveness Analysis (CEA) is a crucial tool for comparing the impact of newly developed technologies to their associated costs. CEA evaluates the costs of two or more new products by examining the benefits derived from them. Therefore, analyzing the cost-effectiveness (CE) of any new innovation is essential before beginning the production process. A comprehensive assessment of costs and benefits is necessary to perform an accurate CEA, which should consider the long-term effects of new developments. CEA is applicable for evaluating all new products and technologies across various sectors, including computer *** this paper, the Cost-Effectiveness Factor (CEF) of a proposed parallel computer system utilizing a shifted completely connected network (SCCN) will be analyzed. This system consists of multiple levels and the cost of creating each level will be compared to the benefits obtained from it. Additionally, each level will be compared to other networks with a similar number of processing elements (PEs). To evaluate this network, the cost-effectiveness factor (CEF) will be calculated. Each level of the SCCN demonstrated the lowest CEF when compared to the two-dimensional networks included in the study.

关键词： Technological innovation Costs Accuracy Education Production

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Simulative performance evaluation of a mobile peer-to-peer file-sharing system

Simulative performance evaluation of a mobile peer-to-peer f...

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Conference on Next Generation Internet networks, NGI

作者： T. Hopfeld K. Tutschku F.-U. Andersen H. de Meer J.O. Oberender Dept. of Distributed Syst. Wurzburg Univ. Germany Department of Distributed Systems University of Wiirzburg Germany SIEMENS AG Berlin Germany Chair of Computer Networks and Computer Communications University of Passau Germany

Peer-to-peer (P2P) file-sharing has become the killer application in the wired Internet and might also be highly attractive for mobile networks. In particular since UMTS operators are searching for new applications which do both: a) exploit the potential of the UMTS technology and b) motivate the user to adopt the new technology. In this work we are investigating the performance of an eDonkey-based mobile P2P file-sharing system by means of time-dynamic simulation. Mobile networks differ from wireline networks by the limited capacity of the radio link and the mobility of the users. P2P networks, in contrast, are overlays which consider the transport network in an abstract way. In a mobile environment, the question arises, whether the abstraction can be maintained and what will be the performance impact if there is any. We will show in detail how the mobile access technology (GPRS or UMTS), the churn behavior of mobile users, the file size of mobile specific content, and special infrastructure entities, such as a cache peer, influences the performance of the suggested mobile P2P file-sharing service.

关键词： Peer to peer computing 3G mobile communication Telecommunication traffic Communication system traffic control computer networks Mobile communication Application software Radio link Ground penetrating radar Payloads

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IsoGAN: A Gan Based Method for Isometric View Images Generation From Three Orthographic Views Contour Drawings

IsoGAN: A Gan Based Method for Isometric View Images Generat...

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Image Processing Challenges (ICIPC), IEEE International Conference on

作者： Thao Nguyen Phuong Hidetomo Sakaino Vinh Nguyen Duy Data Solution Dept. (FCJ.ABC) FPT Consulting Japan AI-Image Group FPT Software Department of Computer Science and Communications Engineering Waseda University

ISBN: (数字)9798331515942

ISBN: (纸本)9798331515959

Reconstructing the 2D or 3D shape of an object from several 2D drawings is a crucial problem in computer-aided design (CAD). Despite the advancement of deep neural networks, automatic isometric image generation from three orthographic views line drawings using deep learning remains unresolved. Existing image-to-image translation techniques often generate images from just one input image. In this paper, we propose a novel method for the above task using a GAN-based model, namely IsoGAN. This method takes three images of object’s front, side, and top view as input, then analyzes the spatial and geometrical relations between each view and finally generates the corresponding isometric view image of the object. Extensive experiments on SPARE3D dataset show promising results of IsoGAN on isometric view generation task, demonstrating the effectiveness of the proposed IsoGAN.

关键词： Deep learning Solid modeling Design automation Three-dimensional displays Image synthesis Shape Transforms Vectors Generators Image reconstruction

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PV-Cap: 3D Dynamic Scene Understanding Through Open Physics-based Vocabulary

PV-Cap: 3D Dynamic Scene Understanding Through Open Physics-...

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IEEE computer Society Conference on computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Hidetomo Sakaino Thao Nguyen Phuong Vinh Nguyen Duy Data Solution Dept. AI-Image Group (FCJ.ABC) FPT Consulting Japan FPT Software Department of Computer Science and Communications Engineering Waseda University

ISBN: (数字)9798350365474

ISBN: (纸本)9798350365481

Recently, large Vision Language (VL) models, i.e., CLIP, have demonstrated impressive capabilities in training solely on internet-scale image-language pairs. Moreover, almost all VL models have tackled indoor objects under controlled illumination and camera views. However, outdoor 3D environments are time-varying uncontrolled scenes under natural phenomena. Therefore, captions from such unseen scenes and objects are hard to obtain in a state-of-the-art (SOTA) one-shot algorithm, resulting in insufficient captions. This paper proposes PV-Cap (Physics-based Vocabulary for Caption) for enhancing 3D scene understanding through enriched captions. Since many tasks in understanding 3D dynamic scenes are hard to deal with, PVCap aims to disentangle such complexities through multiple grouped Deep Learning and Vision Language models step-wisely. Proposed i-VQA (iterative VQA) and 3D-CPP (3D Contrastive Physical-Scale Pretraining) extended from SOTA 2D-CLIP also contribute to generating physical and 3D-based captions. Using many images with 3D dynamic events, i.e., road scenes with traffic flow and accidents, experiments have demonstrated the usability and effectiveness of proposed PV-Cap over SOTA models in terms of segmentation and captions.

关键词： Deep learning Training Solid modeling Vocabulary Three-dimensional displays Roads Cameras

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Network topology inference from non-stationary graph signals

Network topology inference from non-stationary graph signals

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Rasoul Shafipour Santiago Segarra Antonio G. Marques Gonzalo Mateos Dept. of Electrical and Computer Engineering University of Rochester NY USA Institute for Data Systems and Society Massachusetts Institute of Technology Cambridge USA Dept. of Signal Theory and Communications King Juan Carlos University Madrid Spain

ISBN: (纸本)9781509041183

We address the problem of inferring a graph from nodal observations, which are modeled as non-stationary graph signals generated by local diffusion dynamics that depend on the structure of the sought network. Using the so-called graph-shift operator (GSO) as a matrix representation of the graph, we first identify the eigenvectors of the shift matrix from realizations of the diffused signals, and then we rely on these spectral templates to estimate the eigenvalues by imposing desirable properties on the graph to be recovered. Different from the stationary setting where the GSO and the covariance matrix of the observed signals are simultaneously diagonalizable, here they are not. Hence, estimating the eigenvectors requires first estimating the unknown diffusion (graph) filter - a polynomial in the GSO which does preserve the sought eigenbasis. To carry out this initial system identification step, we leverage different sources of information on the input signal driving the diffusion process on the graph. Numerical tests showcase the effectiveness of the proposed algorithms in recovering social and structural brain graphs.

关键词： Network topology inference graph signal processing (non-)stationary graph processes system identification System identification Line graph Eigenvector Matrix representation Graphics processing input signal signals Diffusion processes variance covariance matrix Information source Network topology diffusion

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Preconditioning techniques for the method of auxiliary sources applied to geometries characterized as perturbations of a circle

Preconditioning techniques for the method of auxiliary sourc...

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European Conference on Antennas and Propagation: EuCAP 2006

作者： Voulais, Angelos T. Avdikos, Georgios K. Anastassiu, Hristos T. School of Electrical and Computer Engineering National Technical University of Athens Heroon Polytechniou 9 GR-15780 Zografou Greece School of Applied Mathematics and Physics National Technical University of Athens Heroon Polytechniou 9 GR-15780 Zografou Greece Hellenic Aerospace Industry Communications and Networks Design and Development Dept. PO Box 23 Schimatari - Tanagra Viotia Greece

ISBN: (纸本)9290929375

Two versions of a preconditioning procedure are described for a class of two-dimensional scattering problems, when the latter are solved via the Method of Auxiliary Sources (MAS). The method is useful for the case of shrinking auxiliary surfaces, i.e. when the linear system may become ill-conditioned. If the cross sectional boundary can be regarded as a deformation of a circle, the MAS matrix is shown to be quasi-circulant, as expected intuitively. By utilizing the circulant properties of the matrix pertaining to the original circular configuration, the perturbed system is transformed to a quasi-diagonal one, whose inversion is a numerically stable operation.

关键词： Problem solving

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Extended Adaptive data-Rate (X-ADR) Technique for Optimal Resource Allocation in Smart City Applications

Extended Adaptive Data-Rate (X-ADR) Technique for Optimal Re...

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IEEE International Symposium on World of Wireless Mobile and Multimedia networks (WoWMoM)

作者： Nikumani Choudhury Manik Gupta Moustafa M. Nasralla Satoshi Fujita Dept. of Computer Science and Information Systems Birla Institute of Technology & Science Pilani Hyderabad India Dept. of Communications & Networks Engineering Prince Sultan University Riyadh Saudi Arabia Graduate School of Advanced Science and Engineering Hiroshima University Japan

With the rapid growth of urbanization, the need for sustainable, energy-efficient, and smart solutions for home, industry, governance, traffic, and in general, the need for improved quality of life and health has risen. As an enabling technology, the Internet of Things (IoT) must facilitate several advanced applications with varied QoS requirements for smart cities. In this regard, Long Range (LoRa) technologies can be an ideal communication protocol for resource-constrained IoT devices. The LoRa Wide Area Network (LoRaWAN) defines physical layer options and the medium access control (MAC) sub-layer protocols for facilitating low-power, low-rate communications among battery-operated wireless IoT devices. With the enormous number of IoT devices and growing QoS requirements, it is imperative to optimally allocate resources (bandwidth, spreading factor, and transmit power) to these constrained devices so that network lifetime can be improved. The Adaptive data-Rate (ADR) technique is used by the Network Servers (NS) to adapt the transmission parameters of the devices optimally. This is based on several received parameters from the end devices as well as the network settings. In this work, we extend the ADR technique to the LoRa gateways to consider the class of LoRa devices and the frequency of transmissions further to extend the energy efficiency and lifespan of IoT devices. Additionally, there is a considerable delay in adapting to optimal settings for the end-devices resulting in excess power dissipation. Further, a novel mechanism is proposed to address the congestion issue in the network using the Spreading Factor parameter (SF).

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