Performance Comparison of Different Class-and-Drop Treatment of Data and Acknowledgements in DiffServ IP Networks

Author(s):  
Stefan Köhler ◽  
Uwe Schäfer
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Pedro Rodrigues Torres-Jr ◽  
Eduardo Parente Ribeiro

Despite the existence of several metrics to perform measurements on out-of-order packets, few works have used these metrics for comparative purposes. A potential reason for this is that the use of these simple singleton metrics makes it difficult to analyze all the effects of packet reordering. On the other hand, more complete metrics are represented in a vectorial manner, making comparative analysis challenging. In this paper, we present a scenario for testing and describe a methodology for conducting experiments to compare network paths with respect to unordered packets. The results of several simulations explore simple packet reordering metrics derived from vector metric that may allow future work to be benchmarked against. We demonstrated the behaviour of some TCP congestion control algorithms by adjusting different levels of reordering. We highlight good results with the Entropy reorder metric.


Author(s):  
Ivan Nedyalkov

In this paper an IP based network consisting of two separate IP networks - a virtual one, running MPLS and an experimental IP network, connected to the virtual one, have been studied. VoIP traffic is exchanged between the two networks. Both networks are connected to the Internet and exchange traffic with it. The virtual network is created by using GNS3. The purpose of this paper is to show a comparison in the performance between the two IP networks. In addition, mathematical distributions and approximations have been made to be used to further evaluate the performance of the two networks. The used methodology in the present work can be applied in the study of different IP networks through which different types of real-time traffic passes.


2006 ◽  
Vol 50 (3) ◽  
pp. 332-349 ◽  
Author(s):  
Leopoldo Angrisani ◽  
Salvatore D’Antonio ◽  
Marcello Esposito ◽  
Michele Vadursi

Author(s):  
Antonio Nucci ◽  
Konstantina Papagiannaki
Keyword(s):  

Author(s):  
Molla Asmare ◽  
Mustafa Ilbas

Nowadays, the most decisive challenges we are fronting are perfectly clean energy making for equitable and sustainable modern energy access, and battling the emerging alteration of the climate. This is because, carbon-rich fuels are the fundamental supply of utilized energy for strengthening human society, and it will be sustained in the near future. In connection with this, electrochemical technologies are an emerging and domineering tool for efficiently transforming the existing scarce fossil fuels and renewable energy sources into electric power with a trivial environmental impact. Compared with conventional power generation technologies, SOFC that operate at high temperature is emerging as a frontrunner to convert the fuels chemical energy into electric power and permits the deployment of varieties of fuels with negligible ecological destructions. According to this critical review, direct ammonia is obtained as a primary possible choice and price-effective green fuel for T-SOFCs. This is because T-SOFCs have higher volumetric power density, mechanically stable, and high thermal shocking resistance. Also, there is no sealing issue problem which is the chronic issues of the planar one. As a result, the toxicity of ammonia to use as a fuel is minimized if there may be a leakage during operation. It is portable and manageable that can be work everywhere when there is energy demand. Besides, manufacturing, onboard hydrogen deposition, and transportation infrastructure connected snags of hydrogen will be solved using ammonia. Ammonia is a low-priced carbon-neutral source of energy and has more stored volumetric energy compared with hydrogen. Yet, to utilize direct NH3 as a means of hydrogen carrier and an alternative green fuel in T-SOFCs practically determining the optimum operating temperatures, reactant flow rates, electrode porosities, pressure, the position of the anode, thickness and diameters of the tube are still requiring further improvement. Therefore, mathematical modeling ought to be developed to determine these parameters before planning for experimental work. Also, a performance comparison of AS, ES, and CS- T-SOFC powered with direct NH3 will be investigated and best-performed support will be carefully chosen for practical implementation and an experimental study will be conducted for verification based on optimum parameter values obtained from numerical modeling.


1999 ◽  
Author(s):  
C-C. Chen ◽  
C. Lai ◽  
T. Shih

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