THE REAL-TIME ASSESSING METHOD FOR THE STATE OF NETWORK ELEMENTS TO PROVIDE FOR QUALITY PARAMETERS IN CORPORATE HIGH-SPEED MULTISERVICE COMMUNICATION NETWORKS

The work proposes and investigates an intelligent method and algorithms for on-line assessment of the state of network elements to ensure the required quality indicators of provided communication services in corporate high-speed multiservice communication networks. The developed method and algorithms operate in a mode close to real time. One of the features of corporate multiservice communication networks is the high dynamics of changes in their state. The main task of the automated control system, which is an integral part of the corporate multiservice communication network, is to ensure the specified quality of the provided communication services to the consumer. Thus, the relevance of the research presented in the work is due to the fact that most of the management processes in corporate high-speed multiservice communication networks must be implemented in a mode close to real time with a given quality. The basis of the method for operational assessment of the state of network elements is the concept of creating and using intelligent agents. In the proposed approach, intelligent agents are created as hierarchical fuzzy situational networks, in which control solutions, in contrast to known methods based on the use of reference situations, are applied based on solving a hierarchical set of optimization problems using fuzzy mathematical programming methods. The main paradigm of their functioning is “situation -action”.

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Single-Satellite Integrated Navigation Algorithm Based on Broadband LEO Constellation Communication Links

Remote Sensing ◽

10.3390/rs13040703 ◽

2021 ◽

Vol 13 (4) ◽

pp. 703

Author(s):

Lvyang Ye ◽

Yikang Yang ◽

Xiaolun Jing ◽

Jiangang Ma ◽

Lingyu Deng ◽

...

Keyword(s):

Real Time ◽

Satellite Communication ◽

The State ◽

Earth Orbit ◽

Integrated Navigation ◽

Location Services ◽

The Real ◽

Navigation Algorithm ◽

Communication Links ◽

Leo Satellite

With the rapid development of satellite technology and the need to satisfy the increasing demand for location-based services, in challenging environments such as indoors, forests, and canyons, there is an urgent need to improve the position accuracy in these environments. However, traditional algorithms obtain the position solution through time redundancy in exchange for spatial redundancy, and they require continuous observations that cannot satisfy the real-time location services. In addition, they must also consider the clock bias between the satellite and receiver. Therefore, in this paper, we provide a single-satellite integrated navigation algorithm based on the elimination of clock bias for broadband low earth orbit (LEO) satellite communication links. First, we derive the principle of LEO satellite communication link clock bias elimination; then, we give the principle and process of the algorithm. Next, we model and analyze the error of the system. Subsequently, based on the unscented Kalman filter (UKF), we model the state vector and observation vector of our algorithm and give the state and observation equations. Finally, for different scenarios, we conduct qualitative and quantitative analysis through simulations, and the results show that, whether in an altimeter scenario or non-altimeter scenario, the performance indicators of our algorithm are significantly better than the inertial navigation system (INS), which can effectively overcome the divergence problem of INS; compared with the medium earth orbit (MEO) constellation, the navigation trajectory under the LEO constellation is closer to the real trajectory of the aircraft; and compared with the traditional algorithm, the accuracy of each item is improved by more than 95%. These results show that our algorithm not only significantly improves the position error, but also effectively suppresses the divergence of INS. The algorithm is more robust and can satisfy the requirements of cm-level real-time location services in challenging environments.

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Application of the Real-Time EtherCAT Technology in Wind Power Control System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.580.155 ◽

2012 ◽

Vol 580 ◽

pp. 155-159

Author(s):

Xiang Ming Wang ◽

Jin Chao Wang ◽

Dong Hua Sun

Keyword(s):

Control System ◽

Real Time ◽

Wind Power ◽

High Speed ◽

Communication Protocol ◽

Data Communication ◽

Data Acquisition System ◽

Slave System ◽

The Real ◽

Wind Power System

In this paper, the real-time EtherCAT technology is introduced in detail, which including operating principle, communication protocol and the superiority performance of EtherCAT i.e. synchronicity, simultaneousness and high speed. To show how to design a slave system that considering the characteristics of application, the method of developing systems based no EtherCAT technology are proposed. Finally, a data acquisition system based on EtherCAT technology is designed. Application of EtherCAT technology can improve the real-time characteristics of data communication in wind power system.

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A Survey of Real-Time Industrial Wireless LAN Research

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.738-739.1105 ◽

2015 ◽

Vol 738-739 ◽

pp. 1105-1110 ◽

Cited By ~ 1

Author(s):

Yuan Qing Qin ◽

Ying Jie Cheng ◽

Chun Jie Zhou

Keyword(s):

Real Time ◽

Future Development ◽

Wireless Lan ◽

State Of The Art ◽

The State ◽

Local Networks ◽

The Real ◽

Time Requirements ◽

And Performance ◽

Fundamental Mechanism

This paper mainly surveys the state-of-the-art on real-time communicaton in industrial wireless local networks(WLANs), and also identifys the suitable approaches to deal with the real-time requirements in future. Firstly, this paper summarizes the features of industrial WLANs and the challenges it encounters. Then according to the real-time problems of industrial WLAN, the fundamental mechanism of each recent representative resolution is analyzed in detail. Meanwhile, the characteristics and performance of these resolutions are adequately compared. Finally, this paper concludes the current of the research and discusses the future development of industrial WLANs.

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Development of six-degree of freedom strapdown terrestrial INS algorithm

Baghdad Science Journal ◽

10.21123/bsj.2.1.155-165 ◽

2005 ◽

Vol 2 (1) ◽

pp. 155-165

Author(s):

Baghdad Science Journal

Keyword(s):

Real Time ◽

High Speed ◽

Degree Of Freedom ◽

The Real ◽

Six Degree Of Freedom

Many of accurate inertial guided missilc systems need to use more complex mathematical calculations and require a high speed processing to ensure the real-time opreation. This will give rise to the need of developing an effcint

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Adaptive method of detecting traffic anomalies in high-speed multi-service communication networks

E3S Web of Conferences ◽

10.1051/e3sconf/202015704027 ◽

2020 ◽

Vol 157 ◽

pp. 04027 ◽

Cited By ~ 2

Author(s):

Sergey Ageev ◽

Vladimir Karetnikov ◽

Evgeny Ol’khovik ◽

Andrey Privalov

Keyword(s):

Network Security ◽

Real Time ◽

Communication Networks ◽

High Speed ◽

High Efficiency ◽

Adaptive Methods ◽

Adaptive Method ◽

Anomalous Behavior ◽

Preliminary Training ◽

Network Attacks

In the paper, an adaptive hybrid heuristic (behavioral) method for detecting small traffic anomalies in high-speed multiservice communication networks, which operates in real time, is proposed and investigated. The relevance of this study is determined by the fact that network security management processes in high-speed multiservice communication networks need to be implemented in a mode close to real-time mode, as well as identifying possible network security threats in the early stages of the implementation of possible network attacks. The proposed method and algorithm belong to the class of adaptive methods and algorithms with preliminary training. The average relative error in estimating the evaluated traffic parameters does not exceed 10%, which is sufficient for the implementation of operational network management tasks. Anomalies of the expectation of traffic intensity and its dispersion are identified if their valuesexceed the normal values by 15% or more, which makes it possible to detect possible network attacks in the early phases of their implementation, for example, at the stage of scanning ports and interfaces of the attacked system. The procedure for detecting anomalous traffic behavior is implemented based on the Mamdani’s method of hierarchical fuzzy logical inference. A study of the proposed method for detecting anomalous behavior of network traffic showed its high efficiency.

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A Real-Time Hard X-Ray Tomographic System Designed for HL-2A Fast Electron Bremsstrahlung Radiation

Volume 1: Beyond Design Basis; Codes and Standards; Computational Fluid Dynamics (CFD); Decontamination and Decommissioning; Nuclear Fuel and Engineering; Nuclear Plant Engineering ◽

10.1115/icone2020-16259 ◽

2020 ◽

Author(s):

Chen Yuan ◽

Jun Wu

Keyword(s):

Real Time ◽

Fast Electron ◽

High Speed ◽

Lower Hybrid ◽

Processing Unit ◽

Bremsstrahlung Radiation ◽

X Ray ◽

The Real ◽

Electron Bremsstrahlung ◽

Plasma State

Abstract A real-time hard X-ray (HXR) tomographic system is designed for HL-2A tokamak, which is dedicated to the real-time tomography of fast electron bremsstrahlung radiation during the lower hybrid (LH) driven mode within the energy range of 20keV to 200keV. This system has realized the investigation of HXR energy from 12 different chords on the equatorial plane of the reaction region. The spatial and temporal resolutions of the system are 2cm and 10ms, separately. HXR detection is accomplished by a self-designed detector array, with a structure of 12 arc arranged cadmium telluride (CdTe) semiconductors and their corresponding collimators. The real-time HXR acquisition and processing is achieved by the main electronic system, which is comprised of a high speed analog-to-digital module and a high performance signal processing unit. Due to high HXR flux and the real-time demand in measurement, the HXR tomography is accomplished by several customized digital processing algorithms based on FPGA logic resources, such as the digital real-time spectrum measurement, the trapezoidal shaper, the pile up filter, and the baseline restorer, etc. This system has been proved to be qualified as a dependable platform of fast electron bremsstrahlung radiation research during LH mode on HL-2A, which provides indispensable parameters for plasma state during fusion reaction.

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Integration of the state observer RAPTOR in the real-time MARTe framework at RFX-mod

Fusion Engineering and Design ◽

10.1016/j.fusengdes.2017.02.093 ◽

2017 ◽

Vol 123 ◽

pp. 616-619 ◽

Cited By ~ 3

Author(s):

Chiara Piron ◽

Gabriele Manduchi ◽

Paolo Bettini ◽

Federico Felici ◽

Claudio Finotti ◽

...

Keyword(s):

Real Time ◽

State Observer ◽

The State ◽

The Real

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Pantograph-Catenary Model Simulation Based on DSPACE

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.2967 ◽

2012 ◽

Vol 256-259 ◽

pp. 2967-2970

Author(s):

Shuai Lin ◽

Zhi Qiang Ju

Keyword(s):

Real Time ◽

Physical Model ◽

High Speed ◽

Model Simulation ◽

The State ◽

Rail Transit ◽

High Speed Rail ◽

Simulation Based ◽

Primary Means ◽

The City

With the city subway and high speed rail opened, development of rail transit pays more and more people's attention. And the pantograph is the primary means of train running at high speed to get power. Using Simulink and dSPACE in combination, real-time captures the pantograph and catenary's motion. According to the state of the pantograph’s motion, analyses physical model, so as to achieve the purpose of independent manufacturing pantograph pantograph.

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RT-SAD: Real-Time Sketch-Based Adaptive DDoS Detection for ISP Network

Security and Communication Networks ◽

10.1155/2021/9409473 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Haibin Shi ◽

Guang Cheng ◽

Ying Hu ◽

Fuzhou Wang ◽

Haoxuan Ding

Keyword(s):

Real Time ◽

High Speed ◽

Attack Detection ◽

Detection Accuracy ◽

Network Environment ◽

The Real ◽

Feature Extraction Method ◽

Ddos Attack ◽

High Speed Network ◽

Ddos Attack Detection

With the great changes in network scale and network topology, the difficulty of DDoS attack detection increases significantly. Most of the methods proposed in the past rarely considered the real-time, adaptive ability, and other practical issues in the real-world network attack detection environment. In this paper, we proposed a real-time adaptive DDoS attack detection method RT-SAD, based on the response to the external network when attacked. We designed a feature extraction method based on sketch and an adaptive updating algorithm, which makes the method suitable for the high-speed network environment. Experiment results show that our method can detect DDoS attacks using sampled Netflowunder high-speed network environment, with good real-time performance, low resource consumption, and high detection accuracy.

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