2026-05-27T22:17:46+04:30
http://jor.iranaict.ir/browse.php?mag_id=6&slc_lang=fa&sid=1
فصلنامه فناوری اطلاعات
2013
5
15
Design, simulation and performance comparison of radating elements of reflect array antenna
In this paper, the role of radiation elements in the performance of reflect array antenna is studied, and each element is designed and simulated and the phase response is compared. Also, the relations needed for designing reflect array antenna are discussed and one sample reflect array antenna is designed in the KU band and the results are presented.
Microstrip antenna
Phase response
Reflectarray antenna
2013
4
01
1
8
http://jor.iranaict.ir/article-1-642-en.pdf
فصلنامه فناوری اطلاعات
2013
5
15
Three-axis attitude control of a micro-satellite by magnetic actuators through-synthesis robust method
In this paper a robust controller using µ-synthesis method has been designed for attitude control system of a micro-satellite in LEO orbit. Then the controller has been evaluated with accurate linear and nonlinear simulations. After necessary evaluation three-axis stabilization method with only magnetic torques and auxiliary gravity gradient boom was been selected. Nonlinear kinematics and dynamics equation of this system was obtained and linearization was performed on it. Finally the system was converted into a multivariable linear time varying system and controller for this system was performed via µ-synthesis, which has been done by changing from time varying system into system with uncertainty.
Satellite attitude control
Magnetic attitude control
µ-synthesis
robust control
micro-satellite.
2013
4
01
9
18
http://jor.iranaict.ir/article-1-643-en.pdf
فصلنامه فناوری اطلاعات
2013
5
15
A Model for impacts of Investment in IT on customer satisfaction, using Structural Equation Modeling and Path Analysis
In a research, that this paper reflects its results, a model for stating the relationship between investment in IT and customer satisfaction was developed. This study starts with extensive literature review on investment in IT and customer satisfaction. Then, a conceptual model with four criteria (including Economic, educational, diffusion of ICT and telecommunication) and one latent variable (indicator of customer satisfaction) were designed. This model’s primary validity was approved through expert opinion. Then, in a field study in the organization under study, the required data have been gathered for testing functional approval of the model. In the next stage of research, by using SEM techniques and interactive regression equation in the form of path analysis and using the software like SPSS and LISREL , we concentrated the factors of relationship between latent variable and observed variables. The finding of the research shows direct relationship between economic and educational factors of IT investment on customer satisfaction.
IT investments
Customer satisfaction
Structural Equation Modeling
Path Analysis.
2013
4
01
19
30
http://jor.iranaict.ir/article-1-644-en.pdf
فصلنامه فناوری اطلاعات
2013
5
15
Increasing data throughput in HF channel by decision feedback equalizer employing MC-FQRD-RLS algorithm and weight extraction in data mode
Increasing data throughput of Multipath time-varying HF channel by employing decision feedback equalization is addressed. In this paper, we propose multichannel FQRD-RLS adaptive filtering algorithm employing weight extraction in Decision-directed mode. A comparison between this technique and IQRD-RLS algorithm is performed. Simulation is conducted under channel parameters with respect to MIL-STD-188-110B. The results show higher data throughput in a frame with acceptable computational cost. It is also shown that the achieved data throughput is as same as using MC-FQRD-RLS algorithm in Full-Iteration equalization mode, at a much lower computational cost.
HF channel
throughput
Decision feedback equalizer (DFE)
Adaptive filtering
Weight extraction
2013
4
01
31
38
http://jor.iranaict.ir/article-1-645-en.pdf
فصلنامه فناوری اطلاعات
2013
5
15
A Satellite Control Method Using Laguerre Model Predictive Control Approach
shekoofeh
jafari fesharaki
shekoofeh.jafari@aut.ac.ir
farzad
towhidkhah
towhidkhah@aut.ac.ir
Heidar Ali
Talbei
alit@aut.ac.ir
In this paper a Model Predictive Method based
controller is proposed to control a satellite. Model Predictive
Control (MPC) has been well known as a practical control
method for various systems in industry. A problem with this
method is its computational effort and time consuming. To
reduce computational load Laguerre functions have been
proposed in this literature. Simulation results are given to show
feasibility and the validity of the design. A comparison between
the time consumed in the presence and the absence of the
Laguerre functions is done too.
Satellite
Model Predictive Control
Laguerre Functions
2013
4
01
39
48
http://jor.iranaict.ir/article-1-156-en.pdf
فصلنامه فناوری اطلاعات
2013
5
15
mona
naghdehforoshha
mona_naghdi@yahoo.com
2013
4
01
49
58
http://jor.iranaict.ir/article-1-211-en.pdf