Research on Aircraft Communication and Satellite Link Handoff Simulation for Spatial Information Network

2012 ◽  
Vol 268-270 ◽  
pp. 1688-1691
Author(s):  
Xiao Guo Ye ◽  
Ru Chuan Wang
Keyword(s):  
Spatial Information ◽  
Network Simulation ◽  
Information Network ◽  
Satellite Network ◽  
Network Simulator ◽  
Network Nodes ◽  
Extension Method ◽  
Satellite Link ◽  
Kernel Module ◽  
Simulation Results

Aircraft communication and satellite link handoff issues in spatial information network are very important and are focused in this paper. The simulation modules of satellite network nodes and links in network simulator version 2(NS-2) are analyzed in details in this paper. A method of extending NS-2 kernel module is proposed based on analysis of satellite network simulation principle and approach. As an example, the aircraft communication simulation module is designed and implemented. Simulation results show that flight of aircraft has effect on the link handoff characteristic, and show that the proposed extension method is feasible.

scholarly journals Design and Implementation of Compressed Medical Data over an Authenticated Secured

2020 ◽  
Vol 9 (3) ◽  
pp. 1543-1548
Keyword(s):  
Medical Image ◽  
Research Work ◽  
Health Sector ◽  
Image Data ◽  
Medical Data ◽  
Information Network ◽  
Design And Implementation ◽  
Simulation Results ◽  
Medical Image Data ◽  
Secure Transmission

Ideally, secure transmission of medical image data is one of the major challenges in health sector. The National Health Information Network has to protect the data in confidential manner. Storage is also one of the basic concern along with secure transmission. In this paper we propose an algorithm that supports confidentiality, authentication and integrity implementation of the scrambled data before transmitting on the communication medium. Before communication the data is compressed while keeping data encrypted. The research work demonstrate with simulation results. The results shows that the proposed work effectively maintains confidentiality, authentication and integrity. The experimental results evaluated medical image quality like PSNR, MSE, SC, and NAEetc.

scholarly journals Introducing a Mobility Access Category for IEEE 802.11e

2020 ◽  
Vol 9 (5) ◽  
pp. 1610-1614
Keyword(s):  
Quality Of Service ◽  
Wireless Network ◽  
Ieee 802.11E ◽  
Network Simulator ◽  
Mobile Nodes ◽  
Mobile Stations ◽  
Simulation Scenario ◽  
Simulation Results ◽  
The Impact

With traffic increase in a wireless network beyond its capacity and as the number of connected devices continue to grow, the quality of service (QoS) degrades. In this paper we study the impact of mobility on throughput in the case of an infrastructure wireless network using IEEE 802.11 Wi-Fi standard. Since we found in the literature that the mobility of stations can have an impact on the quality of service, we try to remedy to this by implementing a new access category reserved for mobile stations. First we compare the throughput between static and mobile nodes, both connected to a QoS station. Then we propose our new model that consists of adding a new access category used by mobile nodes regardless of their traffic category. The study was made by simulating different scenarios using Network Simulator-3 (NS-3). We found that the throughput may vary depending on the simulation scenario. The simulation results show that with the proposed solution the mobile nodes can have a better throughput.

scholarly journals LIFT: a Local IPSec-aware Freezing Protocol to improve TCP Performance in Satellite Networks

2017 ◽  
Vol 2 (4) ◽  
pp. 347 ◽  
Author(s):  
Giovanni Ciccarese ◽  
Mario De Blasi ◽  
Sebastiano Elia ◽  
Cosimo Palazzo ◽  
Luigi Patrono
Keyword(s):  
Mobile Host ◽  
Satellite Networks ◽  
Web Page ◽  
Tcp Performance ◽  
Link Layer ◽  
Satellite Link ◽  
Channel Conditions ◽  
Simulation Results ◽  
Link Layer Protocol ◽  
Mean Time

In this paper a protocol, local to the satellite link, is defined in order to boost TCP performance in mobile integrated wired-satellite Internet. It has been conceived to help to overcome the well known retransmissions competition problem that arises when a satellite reliable link layer protocol is used to face satellite link errors. This protocol, called Local IPSec-aware Freezing proTocol (LIFT), has been designed to allow the satellite gateway, even in the presence of communications secured by IPSec, to freeze the TCP sender when it perceives a possible delay due to satellite channel conditions. The effectiveness of LIFT has been evaluated, using the ns-2 tool, in terms of Web page download mean time for a satellite mobile host. Simulation results have shown that the adoption of LIFT protocol provides substantial improvements in TCP performance.

Intelligent design of satellite network nodes

2013 ◽  
Vol 21 (4) ◽  
pp. 1086-1095
Author(s):  
董立珉 DONG Li-min ◽  
刘源 LIU Yuan ◽  
徐国栋 XU Guo-dong ◽  
李鹏飞 LI Peng-fei
Keyword(s):  
Intelligent Design ◽  
Satellite Network ◽  
Network Nodes

scholarly journals The Formation of Social Network Assortativity: A Cultural Trait-Matching Mechanism

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Wei Wang ◽  
Xiaoming Sun ◽  
Yalan Wang ◽  
Wentian Cui
Keyword(s):  
Preferential Attachment ◽  
Scale Free Network ◽  
Selection Probability ◽  
Network Nodes ◽  
Scale Free ◽  
Cultural Trait ◽  
Free Network ◽  
Matching Mechanism ◽  
Simulation Results ◽  
Attachment Mechanism

The preferential attachment mechanism that forms scale-free network cannot display assortativity, i.e., the degree of one node is positively correlated with that of their neighbors in the network. Given the attributes of network nodes, a cultural trait-matching mechanism is further introduced in this paper. Both theoretical analysis and simulation results indicate that the higher selection probability of such mechanism, the more obvious the assortativity is shown in networks. Further, the degree of nodes presents a positive logarithm correlation with that of adjacent ones. Finally, this study discusses the theoretical and practical significances of the introduction of such a cultural trait-matching mechanism.

scholarly journals An Energy Efficient Simultaneous-Node Repositioning Algorithm for Mobile Sensor Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Muhammad Amir Khan ◽  
Halabi Hasbullah ◽  
Babar Nazir ◽  
Imran Ali Khan
Keyword(s):  
Energy Efficient ◽  
Mobile Sensor Networks ◽  
Wireless Sensor ◽  
Mobile Nodes ◽  
Network Nodes ◽  
Connectivity Restoration ◽  
Communication Problems ◽  
Area Of Interest ◽  
Simulation Results ◽  
Failed Node

Recently, wireless sensor network (WSN) applications have seen an increase in interest. In search and rescue, battlefield reconnaissance, and some other such applications, so that a survey of the area of interest can be made collectively, a set of mobile nodes is deployed. Keeping the network nodes connected is vital for WSNs to be effective. The provision of connectivity can be made at the time of startup and can be maintained by carefully coordinating the nodes when they move. However, if a node suddenly fails, the network could be partitioned to cause communication problems. Recently, several methods that use the relocation of nodes for connectivity restoration have been proposed. However, these methods have the tendency to not consider the potential coverage loss in some locations. This paper addresses the concerns of both connectivity and coverage in an integrated way so that this gap can be filled. A novel algorithm for simultaneous-node repositioning is introduced. In this approach, each neighbour of the failed node, one by one, moves in for a certain amount of time to take the place of the failed node, after which it returns to its original location in the network. The effectiveness of this algorithm has been verified by the simulation results.

THE CORPORATE INTERLOCKING DIRECTORATE AS AN URBAN SPATIAL INFORMATION NETWORK

1981 ◽  
Vol 2 (2) ◽  
pp. 148-160 ◽  
Author(s):  
Milford B. Green ◽  
R. Keith Semple
Keyword(s):  
Spatial Information ◽  
Information Network
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