Transport level performance-energy trade-off in wireless networks and consequences on the system-level architecture and design paradigm

2004 ◽  
Author(s):  
B. Bougard ◽  
S. Pollin ◽  
G. Lenoir ◽  
L. Van der Perre ◽  
F. Catthoor ◽  
...  
Keyword(s):  
Wireless Networks ◽  
System Level ◽  
Trade Off ◽  
Energy Trade ◽  
Design Paradigm ◽  
Architecture And Design ◽  
Level Performance

scholarly journals Benefits of Exergy-Based Analysis for Aerospace Engineering Applications—Part I

2009 ◽  
Vol 2009 ◽  
pp. 1-11 ◽  
Author(s):  
John H. Doty ◽  
José A. Camberos ◽  
David J. Moorhouse
Keyword(s):  
Complex System ◽  
Research And Development ◽  
Operating Conditions ◽  
Aerospace Engineering ◽  
The Other ◽  
System Level ◽  
Exploratory Research ◽  
Design Paradigm ◽  
Analysis Design ◽  
Level Performance

This paper compares the analysis of systems from two different perspectives: an energy-based focus and an exergy-based focus. A complex system was simply modeled as interacting thermodynamic systems to illustrate the differences in analysis methodologies and results. The energy-based analysis had combinations of calculated states that are infeasible. On the other hand, the exergy-based analyses only allow feasible states. More importantly, the exergy-based analyses provide clearer insight to the combination of operating conditions for optimum system-level performance. The results strongly suggest changing the analysis/design paradigm used in aerospace engineering from energy-based to exergy-based. This methodology shift is even more critical in exploratory research and development where previous experience may not be available to provide guidance. Although the models used herein may appear simplistic, the message is very powerful and extensible to higher-fidelity models: the 1st Law is only anecessarycondition for design, whereas the 1st and 2nd Laws provide thesufficiencycondition.

scholarly journals On the energy-bandwidth trade-off in green wireless networks: System level results

2012 ◽  
Author(s):  
M. Majid Butt ◽  
Benjamin Schubert ◽  
Martin Kurras ◽  
Kai Borner ◽  
Thomas Haustein ◽  
...  
Keyword(s):  
Wireless Networks ◽  
System Level ◽  
Trade Off

scholarly journals Advanced Secure Energy Aware Trade-off Model to Control Data Communication in Wireless Networks

2019 ◽  
Vol 8 (11) ◽  
pp. 2784-2787
Keyword(s):  
Wireless Networks ◽  
Ad Hoc Networks ◽  
Wireless Ad Hoc Networks ◽  
Ad Hoc ◽  
Energy Aware ◽  
Trade Off ◽  
Efficient Communication ◽  
Secure Data ◽  
Energy Trade ◽  
Hoc Networks

Secure data transmission in ad hoc related wireless networks is an aggressive concept in present node to node communication. Secure energy trade-off between different node communication is also major challenge in wireless ad hoc networks. To provide efficient communication with secure data aware between nodes in ad hoc wireless networks. So that in this paper proposes and introduces Advanced Secure Energy Aware Trade-off Model (ASEATM) for energy trade results in wireless ad hoc networks, also use Elliptic curve cryptography to describe/ provide source authentication with respect to efficient communication in wireless networks. Our experimental results show efficient secure communication in wireless ad hoc networks with comparison to existing approaches in real time scenario

scholarly journals Misalignment in Gas Foil Journal Bearings: An Experimental Study

2008 ◽  
Author(s):  
Samuel A. Howard
Keyword(s):  
Journal Bearings ◽  
System Level ◽  
Design Parameters ◽  
Foil Bearing ◽  
Alignment System ◽  
Successful Design ◽  
Shaft Alignment ◽  
Bearing Force ◽  
Management Schemes ◽  
Level Performance

As gas foil journal bearings become more prevalent in production machines, such as small gas turbine propulsion systems and microturbines, system level performance issues must be identified and quantified in order to provide for successful design practices. Several examples of system level design parameters that are not fully understood in foil bearing systems are thermal management schemes, alignment requirements, balance requirements, thrust load balancing, and others. In order to address some of these deficiencies and begin to develop guidelines, this paper presents a preliminary experimental investigation of the misalignment tolerance of gas foil journal bearing systems. Using a notional gas foil bearing supported rotor and a laser-based shaft alignment system, increasing levels of misalignment are imparted to the bearing supports while monitoring temperature at the bearing edges. The amount of misalignment that induces bearing failure is identified and compared to other conventional bearing types such as cylindrical roller bearings and angular contact ball bearings. Additionally, the dynamic response of the rotor indicates that the gas foil bearing force coefficients may be affected by misalignment.

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