@article{ author = {}, title = {Design, simulation and performance comparison of radating elements of reflect array antenna}, abstract ={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.}, Keywords = {Microstrip antenna, Phase response, Reflectarray antenna}, volume = {5}, Number = {15}, pages = {1-8}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-642-en.html}, eprint = {http://jor.iranaict.ir/article-1-642-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2013} } @article{ author = {}, title = {Three-axis attitude control of a micro-satellite by magnetic actuators through-synthesis robust method}, abstract ={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.}, Keywords = {Satellite attitude control, Magnetic attitude control, µ-synthesis, robust control, micro-satellite.}, volume = {5}, Number = {15}, pages = {9-18}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-643-en.html}, eprint = {http://jor.iranaict.ir/article-1-643-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2013} } @article{ author = {}, title = {A Model for impacts of Investment in IT on customer satisfaction, using Structural Equation Modeling and Path Analysis}, abstract ={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.}, Keywords = {IT investments, Customer satisfaction, Structural Equation Modeling, Path Analysis.}, volume = {5}, Number = {15}, pages = {19-30}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-644-en.html}, eprint = {http://jor.iranaict.ir/article-1-644-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2013} } @article{ author = {}, title = {Increasing data throughput in HF channel by decision feedback equalizer employing MC-FQRD-RLS algorithm and weight extraction in data mode}, abstract ={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.}, Keywords = {HF channel, throughput, Decision feedback equalizer (DFE), Adaptive filtering, Weight extraction}, volume = {5}, Number = {15}, pages = {31-38}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-645-en.html}, eprint = {http://jor.iranaict.ir/article-1-645-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2013} } @article{ author = {jafarifesharaki, shekoofeh and towhidkhah, farzad and Talbei, Heidar Ali}, title = {A Satellite Control Method Using Laguerre Model Predictive Control Approach}, abstract ={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.}, Keywords = {Satellite, Model Predictive Control, Laguerre Functions}, volume = {5}, Number = {15}, pages = {39-48}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-156-en.html}, eprint = {http://jor.iranaict.ir/article-1-156-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2013} } @article{ author = {naghdehforoshha, mo}, title = {}, abstract ={}, Keywords = {}, volume = {5}, Number = {15}, pages = {49-58}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-211-en.html}, eprint = {http://jor.iranaict.ir/article-1-211-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2013} } @article{ author = {}, title = {}, abstract ={}, Keywords = {}, volume = {5}, Number = {17}, pages = {1-22}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-204-en.html}, eprint = {http://jor.iranaict.ir/article-1-204-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2015} } @article{ author = {montazer, Gholamali and GolshaniRosta, Mehrab ali}, title = {An Information Architecture Framework for Utilizing Social Networks in Iranian Higher Education System}, abstract ={Management of social networks, has become a strategic challenge for different applications including education due to its growing importance. Enterprise Architecture (EA), uses a holistic specification of information technology functions in organizations to decrease the complexity of using information technology and to increase its efficiency. As regards, using social networks in education in most countries of the world has not yet finished its preliminary stages, so for this reason there is no standard framework and model. The aim of this paper is to design an appropriate architecture framework for utilizing social networks in higher education system in Iran. To do this,first the concept of social networks and its applications at educational environment have been investigated.Then the concept of enterprise architecture and information architecture framework are studied, Zachman framework has been selected as the main tool and then using questionnaire the vital aspects of implementing social networks in higher education have been identified from the views of experts. The findings of study indicate the main reasons for the use of social networks in higher education (strategy), the most important actors in this field (people), the infrastructure needed (infrastructure), the data and information required in this environment (data) and also the processes required to fulfill the social network of learning (process). The main characteristic of the final framework is a presentation of a comprehensive framework for using social network in education system with attention to local considerations.}, Keywords = {social network, e_learning, information architecture framework, zachman framework, higher education of Iran.}, volume = {5}, Number = {17}, pages = {23-42}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-189-en.html}, eprint = {http://jor.iranaict.ir/article-1-189-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2015} } @article{ author = {Seif, Fatemeh and Osqueizadeh, Rez}, title = {Effect of Menu Location on Visual Attention of Users of Websites}, abstract ={Objective: In order to identify users’ visual attention to left- and right-aligned menus on web pages, fixation count index (FCI) was assessed for both left and right menus using eye tracker to determine which menu is preferred by users in terms of visual attention. Methodology: In total, 116 pages with their menus aligned to left or right, classified into three groups, namely Persian pages, English pages, and Persian-English pages, were shown to 30 subjects who were asked to find a certain word in the menus. Eye tracker was used to collect and record the data pertaining to users’ fixation counts on each menu, as an indicator of their visual attention to the menus. Findings: No difference was found in terms of total fixation count on English pages with respect to menu direction (right or left). However, users’ total fixation counts varied, depending on menu direction (right or left), for Persian pages, Persian-English pages and, in general, for all pages of three sets, indicating a larger fixation count for right-side menus compared to the menus placed at the left side. Conclusion: Given the larger fixation count for right-aligned menus obtained in the present study and the well-established advantages of this type of menus, and since predictability of left-aligned menu has been an advantage in cultures where native languages are read from left to right, and because the previous studies have led to somehow mixed findings on fast performance of tasks and interaction with left-aligned menus, web designers and developers are recommended to use right-aligned menus in designing internal websites.}, Keywords = { Eye Tracker, Menu, Visual Attention, WebPages}, volume = {5}, Number = {17}, pages = {43-56}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-287-en.html}, eprint = {http://jor.iranaict.ir/article-1-287-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2015} } @article{ author = {mosammami, shila and moradi, mahmoud and shahbahrami, asadollah}, title = {A Managerial Examination of the Successful Parameters in the B2C Business}, abstract ={Currently, Electronic Commerce (EC) is a dynamic channel for trading. Because proposed simplicity and speed are competitive advantages which traditional organizations are unable to compete with them and thus not only individuals but also governments need its presence. According to our study, the success of an EC system is arranged by 3 different categories named: Technical Characteristic View, Psychosocial Characteristic View and Managerial Characteristic View. But the managerial characteristic view is going to be argued in this research. Statistical population in this research has been 344 students of university of Guilan and their shopping behavior has been collected with offline and online questionnaires in a limited period of time. Consequently, extracted knowledge for further researches is argued in the following sections.}, Keywords = { B2C E-Commerce, Trust, ECRM, Consumer Satisfaction, Consumer Loyalty}, volume = {5}, Number = {17}, pages = {57-72}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-279-en.html}, eprint = {http://jor.iranaict.ir/article-1-279-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2015} } @article{ author = {}, title = {Document Clustering Based On Ontology and Fuzzy Approach}, abstract ={Data mining, also known as knowledge discovery in database, is the process to discover unknown knowledge from a large amount of data. Text mining is to apply data mining techniques to extract knowledge from unstructured text. Text clustering is one of important techniques of text mining, which is the unsupervised classification of similar documents into different groups. The most important steps in document clustering are how documents are represented and the measurement of similarities between them. By giving a new ontological representation and a similarity measure, this research focuses on improving the performance of text clustering. The text clustering algorithm has been investigated in three aspects: ontological representation of documents, documents similarity measure, fuzzy inference system to measuring the final similarities. Ultimately, the clustering is carried out by bottom-up hierarchical clustering. In the first step, documents are represented as ontological graph according to domain knowledge. In contrast to keywords method, this method is based on domain concepts and represents a document as subgraph of domain ontology. The extracted concepts of document are the graph nodes. Weight is measured for each node in terms of concept frequency. The relation between documents’ concepts specifies the graph edges and the scope of the concepts’ relation determines the edge’s weight. In the second step, a new similarity measure has been presented proportional to the ontological representation. For each document, main and detailed concepts and main edges are determined. The similarity of each couple of documents is computed in three amounts and according to these three factors. In the third step, the fuzzy inference system with three inputs and one output has been designed. Inputs are the similarities of main concepts, detailed concepts and the main edges of two documents and the output is final similarities of the two documents. In final step, a bottom-up hierarchical clustering algorithm is used to clustering the documents according to final similarity matrix. In order to evaluate, the offered method has been compared with the results of Naïve Bayes method and ontology based algorithms. The results indicate that the proposed method improves the precision, recall, F-measure and accuracy and produces more meaningful results.}, Keywords = {Document Clustering, Ontological Graph, Similarity Measure, Fuzzy Inference System}, volume = {5}, Number = {17}, pages = {73-96}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-157-en.html}, eprint = {http://jor.iranaict.ir/article-1-157-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2015} } @article{ author = {}, title = {طراحی اولین پایگاه داده کلمات دستنویس کردی برای سیستم های تشخیص تصویری کلمات}, abstract ={چکیده: یکی از اجزای زیربنایی سیستم های تشخیص تصویری کلمات پایگاه داده هاست. هر سیستمی که در این زمینه طراحی گردد لاجرم می بایست از یک نوع پایگاه داده ها استفاده کند. بدیهی است چون موضوع مورد مطالعه در این سیستم ها شکل نوشتاری زبان های مختلف میباشد پس برای هر زبان مشخص پایگاه داده بخصوصی لازم است. زبانی که این مقاله بر آن متمرکز شده کردی است و در این مقاله مراحل مختلف چگونگی طراحی اولین پایگاه داده دستنویس برای زبان کردی شرح داده شده است. از آنجا که تاکنون هیچ پایگاه داده ای مخصوص تشخیص تصویری کلمات، مربوط به زبان کردی طراحی نشده است بنابراین زمینه ای بکر و مستعد برای انجام تحقیق محسوب می گردد. همچنین با توجه به اینکه زبان کردی دارای دو رسم الخط مختلف لاتین و آرامی می باشد در این مقاله منحصرا به رسم الخط آرامی البته از نوع دستنویس آن پرداخته شده است.}, Keywords = {سیستم های تشخیص تصویری کلمات, پایگاه داده ها, زبان کردی, دستنویس}, volume = {5}, Number = {17}, pages = {96-108}, publisher = {): Association of Information & Communication Technology of Iran}, url = {http://jor.iranaict.ir/article-1-315-en.html}, eprint = {http://jor.iranaict.ir/article-1-315-en.pdf}, journal = {}, issn = {}, eissn = {}, year = {2015} }