Efficient Simulation of Large-Scale P2P Networks: Modeling Network Transmission Times

2007 ◽  
Author(s):  
Gerald Kunzmann ◽  
Robert Nagel ◽  
Tobias Hossfeld ◽  
Andreas Binzenhofer ◽  
Kolja Eger
Keyword(s):  
Large Scale ◽  
P2p Networks ◽  
Efficient Simulation ◽  
Network Transmission

scholarly journals Detection of DDOS attacks in distributed peer to peer networks

2018 ◽  
Vol 7 (2.7) ◽  
pp. 1051
Author(s):  
Gera Jaideep ◽  
Bhanu Prakash Battula
Keyword(s):  
High Risk ◽  
Large Scale ◽  
Peer To Peer ◽  
P2p Network ◽  
Ddos Attacks ◽  
P2p Networks ◽  
Distributed Environment ◽  
Trace Back ◽  
Peer To Peer Networks ◽  
Direct Attack

Peer to Peer (P2P) network in the real world is a class of systems that are made up of thousands of nodes in distributed environments. The nodes are decentralized in nature. P2P networks are widely used for sharing resources and information with ease. Gnutella is one of the well known examples for such network. Since these networks spread across the globe with large scale deployment of nodes, adversaries use them as a vehicle to launch DDoS attacks. P2P networks are exploited to make attacks over hosts that provide critical services to large number of clients across the globe. As the attacker does not make a direct attack it is hard to detect such attacks and considered to be high risk threat to Internet based applications. Many techniques came into existence to defeat such attacks. Still, it is an open problem to be addressed as the flooding-based DDoS is difficult to handle as huge number of nodes are compromised to make attack and source address spoofing is employed. In this paper, we proposed a framework to identify and secure P2P communications from a DDoS attacks in distributed environment. Time-to-Live value and distance between source and victim are considered in the proposed framework. A special agent is used to handle information about nodes, their capacity, and bandwidth for efficient trace back. A Simulation study has been made using NS2 and the experimental results reveal the significance of the proposed framework in defending P2P network and target hosts from high risk DDoS attacks.  

scholarly journals Thermo-Mechanical Investigations of Packed Beds for High Temperature Heat Storage: Continuum Modeling

2019 ◽  
Vol 9 (12) ◽  
pp. 2569
Author(s):  
Philipp Knödler
Keyword(s):  
Large Scale ◽  
Heat Storage ◽  
Storage System ◽  
Packed Bed ◽  
Packed Beds ◽  
Efficient Simulation ◽  
Temperature Heat ◽  
Central Elements ◽  
First Results ◽  
Technical Risks

Thermal energy storage (TES) systems are central elements for various types of new power plant concepts, whereat packed beds represent a promising storage inventory option. Due to thermal expansion and shrinking of the packed bed’s particles during cyclic thermal charging and discharging operation, high technical risks arise, and possibly lead to material failure. In order to accurately design the heat storage system, suitable tools for calculating induced forces and stresses are mandatory. Continuum models offer time efficient simulation results, but are in need of effective packed bed parameters. This paper introduces a methodology for applying a simplified continuum model and presents first results for an exemplarily large-scale application.

A Finite Element Beam-model for Efficient Simulation of Large-scale Porous Structures

2004 ◽  
Vol 7 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Martin Stauber ◽  
Martin Huber ◽  
G. Harry van Lenthe ◽  
Steven K. Boyd* ◽  
Ralph Müller
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Beam Model ◽  
Porous Structures ◽  
Efficient Simulation
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