scholarly journals Design and Simulation of Smart Communication System for Unmanned Arial Vehicles

2021 ◽  
Vol 15 ◽  
pp. 89-94
Author(s):  
Prashant Mani ◽  
Pankaj Singh ◽  
Abhishek Singhal ◽  
Apoorv Katiyar
Keyword(s):  
Communication Networks ◽  
Communication System ◽  
Network Evolution ◽  
Military Operations ◽  
Network Systems ◽  
Public Networks ◽  
Hardware Implementations ◽  
Proposed Model ◽  
Network Simulations ◽  
Reduced Costs

In recent years, the use of drones has drastically increased as the evolution of drone use in commercial sectors and reduced costs of the hardware. Earlier drone services were mostly used for military operations but nowadays the Unmanned Arial Vehicles (UAV) system is very advanced and its applications are not limited to military operations. The recent years have also witnessed a network evolution of UAVs from single ground to air network to multi-UAV network systems along with usage of wireless public networks like LTE which can act as UAV communication channel. In the proposed project, a communication system used in the UAS system is simulated to analyze the UAV behavior under different conditions with respect to mission planning and the communication networks used. A comprehensive study is done on communication networks used in controlling UAVs. For a safer approach, the proposed model is simulated using available software instead of hardware implementations. ArduPilot SITL, MAVProxy and Mission Planner are used to simulate the UAV system virtually. Whereas network simulations of Wi-Fi and LTE network are done with the help of NS-3 on a separate platform. Various network parameters like network delay, throughput, etc., are graphically represented.

Design and Analysis of a Reliable Communication System in Nuclear Safety Instrument & Control System

2021 ◽  
Author(s):  
Le Li ◽  
Zhihui Zhang ◽  
Chao Gao ◽  
Fei Zhou ◽  
Guangqiang Ma
Keyword(s):  
Communication Networks ◽  
Communication System ◽  
Communication Systems ◽  
Nuclear Power ◽  
Data Exchange ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Nuclear Safety ◽  
Safety Communication ◽  
Digital Control Systems

Abstract With the development of digital instrument and control technology for nuclear power plants in recent decades, communication networks have become an important part of safety digital control systems, which takes charge in data exchange between the various sub-systems, and extremely impact on the reliability and safety of the entire I&C system. Traditional communication systems where some special features, such as reliability, safety, real-time, certainty, and independence are not strictly required are various illustrated. However, how to implement a communication system in a safety I&C system is rarely stated in current research. In this research, a reliable safety communication system applied in nuclear power plants is designed and analyzed. The five key characteristics of nuclear safety communication networks are explained, followed by explanation of how to achieve these characteristics. The analysis and verification of the designed system are also stated in this paper, which contributes to proving that the designed nuclear safety communication system could applied in the nuclear power plants.

scholarly journals Modelo de otimização de recursos financeiros para o gerenciamento de riscos empresariais

2017 ◽  
Vol 1 (1) ◽  
pp. 98 ◽  
Author(s):  
Wanderlei Lima Paulo ◽  
Francisco Carlos Fernandes ◽  
Marcia Zanievicz Silva
Keyword(s):  
Linear Programming ◽  
Decision Process ◽  
Control Policy ◽  
Financial Resources ◽  
Business Risk ◽  
Risk Manager ◽  
Operational Costs ◽  
Proposed Model ◽  
Control Target ◽  
Reduced Costs

<p>This article aims to propose a model to determine the best allocation of financial resources for business risk management, permitting the risk manager to define a control policy with reduced costs that reaches a desired control target. The problem of study is presented as an issue of optimization of costs, formulated as a model of whole linear programming, which basic restrictions are associated to the demanded levels of control. The proposed model is applied to a problem of resource allocation for the control of operational costs. The results show that the model is an adequate instrument to better allocate financial resources, which its use proportionates better conditions for the decision process of business risks.</p>

A transportation network evolution model based on link prediction

2021 ◽  
Author(s):  
Shuang Gu ◽  
Keping Li ◽  
Yan Liang ◽  
Dongyang Yan
Keyword(s):  
Network Structure ◽  
Link Prediction ◽  
Transportation Networks ◽  
Network Evolution ◽  
Evolution Model ◽  
Civil Aviation ◽  
Node Degree ◽  
Network Efficiency ◽  
Evolution Mechanism ◽  
Proposed Model

An effective and reliable evolution model can provide strong support for the planning and design of transportation networks. As a network evolution mechanism, link prediction plays an important role in the expansion of transportation networks. Most of the previous algorithms mainly took node degree or common neighbors into account in calculating link probability between two nodes, and the structure characteristics which can enhance global network efficiency are rarely considered. To address these issues, we propose a new evolution mechanism of transportation networks from the aspect of link prediction. Specifically, node degree, distance, path, expected network structure, relevance, population and GDP are comprehensively considered according to the characteristics and requirements of the transportation networks. Numerical experiments are done with China’s high-speed railway network, China’s highway network and China’s inland civil aviation network. We compare receiver operating characteristic curve and network efficiency in different models and explore the degree and hubs of networks generated by the proposed model. The results show that the proposed model has better prediction performance and can effectively optimize the network structure compared with other baseline link prediction methods.

Applied Cryptography in E-mail Services and Web Services

2011 ◽  
pp. 130-145
Author(s):  
Lei Chen ◽  
Wen-Chen Hu ◽  
Ming Yang ◽  
Lei Zhang
Keyword(s):  
Web Services ◽  
Communication Networks ◽  
Secure Communication ◽  
Transport Layer ◽  
Public Key ◽  
Applied Cryptography ◽  
Public Networks ◽  
Trust System ◽  
Security Standards ◽  
E Mail

E-mail services are the method of sending and receiving electronic messages over communication networks. Web services on the other hand provide a channel of accessing interlinked hypermeida via the World Wide Web. As these two methods of network communications turn into the most popular services over the Internet, applied cryptography and secure authentication protocols become indispensable in securing confidential data over public networks. In this chapter, we first review a number of cryptographic ciphers widely used in secure communication protocols. We then discuss and compare the popular trust system Web of Trust, the certificate standard X.509, and the standard for public key systems Public Key Infrastructure (PKI). Two secure e-mail standards, OpenPGP and S/MIME, are examined and compared. The de facto standard cryptographic protocol for e-commerce, Secure Socket Layer (SSL) / Transport Layer Security (TLS), and XML Security Standards for secure web services are also discussed.

Socially-Competent Computing Implementing Social Sensor Design

2012 ◽  
Vol 7 (3) ◽  
pp. 61-70 ◽  
Author(s):  
Maya Dimitrova
Keyword(s):  
Communication Networks ◽  
Real Data ◽  
Sensor Design ◽  
Dynamic Interactions ◽  
Medical Interventions ◽  
Human Interactions ◽  
Proposed Model ◽  
Predicting Behavior ◽  
Level Of Understanding ◽  
Social Sensor

The paper presents a conceptual model for social sensor design in socially-competent computing systems. The model is based on theories of social behavior being driven by the underlying attitudes, rather than on models predicting behavior in response to behavior representing people as physical objects in dynamic interactions. It is proposed to increase the ability of the systems to extract relevant features and to achieve better social competence, similar to the kind that is underlying human interactions by implementing algorithms, capable of predicting behavior in response to attitude. The paper presents an account of the social level of understanding human interactions in the context of three application scenarios – multi-hop communication networks, embedded systems for support of medical interventions and information systems supporting educational activities. Patterns of real data are discussed in terms of the proposed model of social sensor design for enhanced socially-competent computing.

scholarly journals Cumulative effects of triadic closure and homophily in social networks

2020 ◽  
Vol 6 (19) ◽  
pp. eaax7310 ◽  
Author(s):  
Aili Asikainen ◽  
Gerardo Iñiguez ◽  
Javier Ureña-Carrión ◽  
Kimmo Kaski ◽  
Mikko Kivelä
Keyword(s):  
Social Networks ◽  
Communication Networks ◽  
Empirical Studies ◽  
Network Evolution ◽  
Cumulative Effects ◽  
Small Individual ◽  
Individual Level ◽  
Social Network Structure ◽  
Triadic Closure ◽  
Dynamic Interplay

Social network structure has often been attributed to two network evolution mechanisms—triadic closure and choice homophily—which are commonly considered independently or with static models. However, empirical studies suggest that their dynamic interplay generates the observed homophily of real-world social networks. By combining these mechanisms in a dynamic model, we confirm the longheld hypothesis that choice homophily and triadic closure cause induced homophily. We estimate how much observed homophily in friendship and communication networks is amplified due to triadic closure. We find that cumulative effects of homophily amplification can also lead to the widely documented core-periphery structure of networks, and to memory of homophilic constraints (equivalent to hysteresis in physics). The model shows that even small individual bias may prompt network-level changes such as segregation or core group dominance. Our results highlight that individual-level mechanisms should not be analyzed separately without considering the dynamics of society as a whole.

COMMUNICATION SYSTEMS OF POLISH MILITARY CONTINGENTS IN PEACEKEEPING OPERATIONS AND STABILIZATION MISSIONS

2012 ◽  
Vol 164 (2) ◽  
pp. 104-115
Author(s):  
Maciej MARCZYK
Keyword(s):  
Communication Networks ◽  
Communication Systems ◽  
Ad Hoc ◽  
Armed Forces ◽  
Military Operations ◽  
Peacekeeping Operations ◽  
National Security Strategy ◽  
International Operations ◽  
Technical Specifications ◽  
The Republic

Polish soldiers have long participated in international operations under the auspices of various organizations, primarily the UN. However, since Poland’s accession to NATO and the adoption of our country to European Union, the activities of our military contingents have focused primarily on participation in international operations, organized by the two organizations and under the terms of their procedures. Poland, as part of joint and several actions to ensure common security, has actively been engaged in military operations and non-military missions of various international organizations, as well as local actions in the ad hoc coalition created. The degree of involvement and geographical areas are determined by the current capabilities of the armed forces and the clearly defined objectives coincide with the Polish raison d'etat, as defined in the National Security Strategy of the Republic of Polish and expressed in their efforts to strengthen Poland’s international position. This paper presents the results of research on the functioning of NEC communication network (the Polish military contingent) in military operations abroad. The research was carried out among the soldiers-specialists who were involved in international operations and it focused on the organizational requirements: the technical specifications for the NEC communication networks. Also, the research concerned the organization and operation of communication networks and its services as well as the means of communication and IT used by the staff, users, soldiers and NEC employees.

Call-Level Performance Analysis of a Power Line Communication Network Under Disturbance

2011 ◽  
Vol 12 (3) ◽  
Author(s):  
Shensheng Tang ◽  
Yi Xie
Keyword(s):  
Communication Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
Performance Metrics ◽  
Steady State Solution ◽  
Power Line ◽  
Base Station ◽  
Channel Noise ◽  
Power Line Communication ◽  
Proposed Model ◽  
Level Performance

Power line communication (PLC) is a promising technique for information transmission using existing power lines. We analytically model a finite-source PLC network subject to channel noise (disturbance) and evaluate its call-level performance through a queueing theoretic framework. The proposed PLC network model consists of a base station (BS), which is located at a transformer station and connected to the backbone communication networks, and a number of subscriber stations that are interconnected with each other and with the BS via the power line transmission medium. An orthogonal frequency division multiplexing based transmission technique is assumed to be used for providing the transmission channels in a frequency spectrum. The channels are subject to failure during service due to disturbance. We determine the steady-state solution of the proposed model and derive a set of performance metrics of interest. Numerical and simulation results are presented to show the derived metrics with respect to different system parameters. The proposed modeling method can be used for evaluation and design of future PLC networks.

scholarly journals Identification Conditions for the Solvability of NP-complete Problems for the Class of Pre-fractal Graphs

2021 ◽  
Vol 28 (2) ◽  
pp. 126-135
Author(s):  
Aleksandr Vasil'evich Tymoshenko ◽  
Rasul Ahmatovich Kochkarov ◽  
Azret Ahmatovich Kochkarov
Keyword(s):  
Communication Networks ◽  
Hamiltonian Cycle ◽  
Optimization Problems ◽  
Independent Set ◽  
Network Systems ◽  
Logistics Networks ◽  
Complete Problems ◽  
Discrete Problems ◽  
Np Complete ◽  
Discrete Optimization Problems

Modern network systems (unmanned aerial vehicles groups, social networks, network production chains, transport and logistics networks, communication networks, cryptocurrency networks) are distinguished by their multi-element nature and the dynamics of connections between its elements. A number of discrete problems on the construction of optimal substructures of network systems described in the form of various classes of graphs are NP-complete problems. In this case, the variability and dynamism of the structures of network systems leads to an "additional" complication of the search for solutions to discrete optimization problems. At the same time, for some subclasses of dynamical graphs, which are used to model the structures of network systems, conditions for the solvability of a number of NP-complete problems can be distinguished. This subclass of dynamic graphs includes pre-fractal graphs. The article investigates NP-complete problems on pre-fractal graphs: a Hamiltonian cycle, a skeleton with the maximum number of pendant vertices, a monochromatic triangle, a clique, an independent set. The conditions under which for some problems it is possible to obtain an answer about the existence and to construct polynomial (when fixing the number of seed vertices) algorithms for finding solutions are identified.

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