scholarly journals A dynamic computation method for fast and accurate performance evaluation of multi-core architectures

2014 ◽  
Author(s):  
Sebastien Le Nours ◽  
Adam Postula ◽  
Neil W. Bergmann
Keyword(s):  
Performance Evaluation ◽  
Computation Method ◽  
Dynamic Computation ◽  
Accurate Performance

scholarly journals Performance Evaluation of Cloud Data Centers with Batch Task Arrivals

2013 ◽  
pp. 199-223 ◽  
Author(s):  
Hamzeh Khazaei ◽  
Jelena Mišić ◽  
Vojislav B. Mišić
Keyword(s):  
Performance Evaluation ◽  
Queue Length ◽  
Blocking Probability ◽  
General Distribution ◽  
Cloud Data ◽  
Wide Range ◽  
Accurate Performance ◽  
Cloud Data Centers ◽  
Poisson Arrivals

Accurate performance evaluation of cloud computing resources is a necessary prerequisite for ensuring that Quality of Service (QoS) parameters remain within agreed limits. In this chapter, the authors consider cloud centers with Poisson arrivals of batch task requests under total rejection policy; task service times are assumed to follow a general distribution. They describe a new approximate analytical model for performance evaluation of such systems and show that important performance indicators such as mean request response time, waiting time in the queue, queue length, blocking probability, probability of immediate service, and probability distribution of the number of tasks in the system can be obtained in a wide range of input parameters.

On the Accurate Performance Evaluation of the LTE-A Random Access Procedure

2017 ◽  
Author(s):  
Israel Leyva-Mayorga ◽  
Luis Tello-Oquendo ◽  
Vicent Pla ◽  
Jorge Martinez-Bauset ◽  
Vicente Casares-Giner
Keyword(s):  
Performance Evaluation ◽  
Random Access ◽  
Accurate Performance

Numerical Investigation of the 3D Flow Field in a Steam Turbine Axial Exhaust Diffuser: Comparison With Experimental Data and Performance Evaluation

2013 ◽  
Author(s):  
Federico Daccà ◽  
Claudio Canelli ◽  
Stefano Cecchi
Keyword(s):  
Experimental Data ◽  
Performance Evaluation ◽  
Flow Field ◽  
Steam Turbine ◽  
Three Dimensional ◽  
Measured Data ◽  
Accurate Performance ◽  
And Performance ◽  
Lp Turbine ◽  
Actual Geometry

The purpose of this paper is to present a numerical analysis carried out for the performance evaluation of the axial exhaust diffuser of a LP steam turbine. A set of measured data in an actual real scale steam turbine is available for direct comparison. The three dimensional exhaust flow in a LP steam turbine provided with a 48″ LSB is numerically investigated in different real working conditions by means of 3D CFD analysis. A detailed 3D model of the actual geometry is used in order to catch the highly 3D features of the flow field, avoiding the use of numerical periodicity conditions. Boundary conditions are derived both from experimental data and from specific validated 3D simulations of the main flow of the entire LP turbine section from front stages up to the LSN. The comparison with measured data allows to validate the performed CFD simulations and to provide a reliable complete performance curve of the exhaust diffuser geometry coupled with the 48″ LSB design. An important outcome of the work consists also in a generalized method for accurate performance evaluation of axial diffusers.

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