Recent Trends in Aerodynamic Parameter Estimation: a Review of Different Methods along with Their Advantages and Disadvantages

Author(s):  
Bhaskar Koley ◽  
C Anitha Alexandra
2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Erol Egrioglu ◽  
Cagdas Hakan Aladag ◽  
Cem Kadilar

Seasonal Autoregressive Fractionally Integrated Moving Average (SARFIMA) models are used in the analysis of seasonal long memory-dependent time series. Two methods, which are conditional sum of squares (CSS) and two-staged methods introduced by Hosking (1984), are proposed to estimate the parameters of SARFIMA models. However, no simulation study has been conducted in the literature. Therefore, it is not known how these methods behave under different parameter settings and sample sizes in SARFIMA models. The aim of this study is to show the behavior of these methods by a simulation study. According to results of the simulation, advantages and disadvantages of both methods under different parameter settings and sample sizes are discussed by comparing the root mean square error (RMSE) obtained by the CSS and two-staged methods. As a result of the comparison, it is seen that CSS method produces better results than those obtained from the two-staged method.


Author(s):  
L. Yu. Martynov ◽  
O. A. Naumova ◽  
N. K. Zaytsev ◽  
I. Yu. Lovchinovsky

The review describes the application of solid electrodes based on copper for voltammetric analysis of major classes of organic and inorganic substances over the last fifty years. Despite the fact that there are many reviews of individual solid electrodes this review offers the first comprehensive report on all forms of copper electrodes. The advantages and disadvantages of copper electrodes in comparison with electrodes made of other metals are discussed. Varieties of copper electrodes, their basic physico-chemical properties and some specific characteristics of their surface are described. The electrochemical behavior of copper in aqueous solutions and electrocatalytic mechanisms of transformations of matter on its surface are reported. Examples of the use of electrochemical copper sensors for flow-injection analysis and liquid chromatography are given. Recent trends of the use of copper micro- and nanostructured electrodes in electrochemical analysis are reviewed. The prospects of using copper as a material for the creation of new electrochemical sensors are shown.


2013 ◽  
Vol 60 (1) ◽  
pp. 135-144
Author(s):  
Berislav Andrlic ◽  
Hrvoje Budic ◽  
Vjekoslav Pismis

Abstract Measuring customer satisfaction is a very important aspect of marketing strategy. For the organizational's survival in the long run it is indisputable to have the ability to retain the customers. Retaining customers is more profitable than attracting new ones because it is easier to sell a product or service to a someone who has already used it, rather than someone to whom is product or service completely unknown. In order to measure customer satisfaction primary datas were collected using a test method on a sample of students, by a questionnaire in a physical form, analyzing the basic elements of educational process. Also, by researching relevant national and international professional and scientific literature the test method was described, and all of its models. Finally, in the conclusion, the basic thoughts about the paper are revealed through the presentation of practical advantages and disadvantages of marketing concept of satisfaction, and reviewing recent trends in communication with students.


AIAA Journal ◽  
2018 ◽  
Vol 56 (12) ◽  
pp. 4706-4718 ◽  
Author(s):  
Aditya Saini ◽  
Ashok Gopalarathnam

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