perRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519110articleHamid Hassanpourh.hassanpour@shahroodut.ac.ir1Shahrood University of TechnologyThis paper proposes a new automatic image enhancement method by improving the image dynamic range. The improvement is performed via modifying the Gamma value of pixels in the image. Gamma distortion in an image is due to the technical limitations in the imaging device, and impose a nonlinear effect. The severity of distortion in an image varies depends on the texture and depth of the objects. The proposed method locally estimates the Gamma values in an image. In this method, the image is initially segmented using a pixon-based approach. Pixels in each segment have similar characteristics in terms of the need for Gamma correction. Then the Gamma value for each segment is estimated by minimizing the homogeneity of co-occurrence matrix. This feature can represent image details. The minimum value of this feature in a segment shows maximum details of the segment. The quality of an image is improved once more details are presented in the image via Gamma correction. In this study, it is shown that the proposed method performs well in improving the quality of images. Subjective and objective image quality assessments performed in this study attest the superiority of the proposed method compared to the existing methods in image quality enhancement.http://jist.ir/Article/14989Image EnhancementGamma CorrectionSegmentationCo-Occurrence MatrixHomogeneityperRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519110articleHosna Solaimannezhadhosna.sn91@yahoo.com1omid fatemiomid@fatemi.net2Tehran UniversityTehran UniversityPredicting collaboration between two authors, using their research interests, is one of the important issues that could improve the group researches. One type of social networks is the co-authorship network that is one of the most widely used data sets for studying. As a part of recent improvements of research, far much attention is devoted to the computational analysis of these social networks. The dynamics of these networks makes them challenging to study. Link prediction is one of the main problems in social networks analysis. If we represent a social network with a graph, link prediction means predicting edges that will be created between nodes in the future. The output of link prediction algorithms is using in the various areas such as recommender systems. Also, collaboration prediction between two authors using their research interests is one of the issues that improve group researches. There are few studies on link prediction that use content published by nodes for predicting collaboration between them. In this study, a new link prediction algorithm is developed based on the people interests. By extracting fields that authors have worked on them via analyzing papers published by them, this algorithm predicts their communication in future. The results of tests on SID dataset as coauthor dataset show that developed algorithm outperforms all the structure-based link prediction algorithms. Finally, the reasons of algorithm’s efficiency are analyzed and presentedhttp://jist.ir/Article/15025Link predictionSocial networksContent-basedInterest perRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519110articleAbbas Zareianabbaszareian92@gmail.com1Iraj Mahdaviirajash@rediffmail.com2Hamed Fazlollahtabarhfazl@alumni.iust.ac.ir3Mazandaran University of Science and Technology,Babol,Iran.Mazandaran University of Science and Technology,Babol,Iran.Iran University of Science and Technology,Tehran,IranThis research studies the relationship between supply chain and information system strategies, their effects on supply chain operation and functionality of an enterprise. Our research encompasses other ones because it uses a harmonic structure between information systems and supply chain strategies in order to improve supply chain functionality. The previous research focused on effects of information systems on modification of the relationship between supply chain strategies and supply chain function. We decide to evaluate direct effects of information systems on supply chain strategies. In this research, we show that information systems strategy to improve the relationship between supply chain and supply chain strategies will be. Therefore, it can be said that creating Alignment between informational system strategy and supply chain strategies finally result in improvement of supply chain functionality and company’s operation.http://jist.ir/Article/14977Functional informational systemsflexible informational systemssupply chain performanceperRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519110articleForough Farazzmanesh (Isvand)foroghisvand@gmail.com1Monireh Hosseinihosseini@kntu.ac.ir2Department of Information Technology, Faculty of Industrial Engineering, K. N. Toosi University of Technology, Tehran, IranDepartment of Information Technology, Faculty of Industrial Engineering, K. N. Toosi University of Technology, Tehran, IranIn today's competitive environment, customers are the most important asset to any company. Therefore companies should understand what the retention and value drivers are for each customer. An approach that can help consider customers‘ different value dimensions is the value network. This paper aims to introduce a new approach using data mining techniques for mapping and analyzing customers‘ value network. Besides, this approach is applied in a real case study. This research contributes to develop and implement a methodology to identify and define network entities of a value network in the context of B2B relationships. To conduct this work, we use a combination of methods and techniques designed to analyze customer data-sets (e.g. RFM and customer migration) and to analyze value network. As a result, this paper develops a new strategic network view of customers and discusses how a company can add value to its customers. The proposed approach provides an opportunity for marketing managers to gain a deep understanding of their business customers, the characteristics and structure of their customers‘ value network. This paper is the first contribution of its kind to focus exclusively on large data-set analytics to analyze value network. This new approach indicates that future research of value network can further gain the data mining tools. In this case study, we identify the value entities of the network and its value flows in the telecommunication organization using the available data in order to show that it can improve the value in the network by continuous monitoring. http://jist.ir/Article/15030Business-to-business Marketing Business Customers’ Value Network Market Segmentation Data Mining Telecommunication Industry Value Network AnalysisperRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519110articleOmid Reza Bolouki Speilyspeily@uut.ac.ir1Urmia University of TechnologyNowadays, with the advent of social networks, a big change has occurred in the structure of web-based services. Online community (OC) enable their users to access different type of Information, through the internet based structure anywhere any time. OC services are among the strategies used for production and repost of information by users interested in a specific area. In this respect, users become members in a particular domain at will and begin posting. Considering the networking structure, one of the major challenges these groups face is the lack of reposting behavior. Most users of these systems take up a lurking position toward the posts in the forum. De-lurking is a type of social media behavior where a user breaks an "online silence" or habit of passive thread viewing to engage in a virtual conversation. One of the proposed ways to improve De-Lurking is the selection and display of influential posts for each individual. Influential posts are so selected as to be more likely reposted by users based on each user's interests, knowledge and characteristics. The present article intends to introduce a new method for selecting k influential posts to ensure increased repost of information. In terms of participation in OCs, users are divided into two groups of posters and lurkers. Some solutions are proposed to encourage lurking users to participate in reposting the contents. Based on actual data from Twitter and actual blogs with respect to reposts, the assessments indicate the effectiveness of the proposed method.http://jist.ir/Article/14944De-Lurking Post SimilarityLurkerOnline CommunityperRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519172182articleKamran Farajzadeh k.farajzadeh@iau-tnb.ac.ir1Esmail Zarezadeh zarezadeh@aut.ac.ir2Jafar Mansourijafar.mansouri@gmail.com3Islamic Azad University, North Tehran branchAmir Kabir University Ferdowsi university of MashhadNew visual and static features, namely, right singular feature vector, left singular feature vector and singular value feature vector are proposed for the semantic concept detection in images. These features are derived by applying singular value decomposition (SVD) "directly" to the "raw" images. In SVD features edge, color and texture information is integrated simultaneously and is sorted based on their importance for the concept detection. Feature extraction is performed in a multi-granularity partitioning manner. In contrast to the existing systems, classification is carried out for each grid partition of each granularity separately. This separates the effect of classifications on partitions with and without the target concept on each other. Since SVD features have high dimensionality, classification is carried out with K-nearest neighbor (K-NN) algorithm that utilizes a new and "stable" distance function, namely, multiplicative distance. Experimental results on PASCAL VOC and TRECVID datasets show the effectiveness of the proposed SVD features and multi-granularity partitioning and classification methodhttp://jist.ir/Article/14972High-dimensional datamulti-granularity partitioning and classificationmultiplicative distancesemantic concept detectionstatic visual featuresSVDperRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519110articleHassan Tavakolihasantavakoli1983@gmail.com1Saeid Pakravansaeidpak70@yahoo.com2University of guilanUniversity of guilanThe Polar coding is a method which have been proposed by Arikan and it is one of the first codes that achieve the capacity for vast numerous channels. This paper discusses relay channel polarization in order to achieve the capacity and it has been shown that polarization of two relay channels can be given a more achievable rate region in the general form. This method is compatible with the original vision of polarization based on the combining, splitting and polarizing of channels and it has been shown that the complexity of encoding and decoding for these codes in mentioned method are O(N log⁡〖N)〗, and also error probability for them is O(2^(〖-(N)〗^β )). Choose the best sub-channels in polarized relay channels for sending data is a big trouble in this structure. In this paper, we have been presented a new scheme for choosing a good index for sending the information bits in relay channels polarized in order to have the best performance by using sending information bits over FIF sets.http://jist.ir/Article/14974Relay channelPolar codeChannel polarizationCapacityRelay channel polarizationGood index of relay channelperRICESTJournal of Information Systems and Telecommunication (JIST) 2322-14372345-27732017-11519155161articleSaman Qadaki Moghaddamsam13671367@yahoo.com1Neda AbdolvandAbdolvand@gmail.com2Saeedeh Rajaee Harandisaeedeh.rh@gmail.com3Department of Electrical, Computer and IT Engineering, Qazvin Azad University, Qazvin, IranAlzahra UniversityDepartment of Social Science and Economics, Alzahra University, Tehran, IranToday, increased competition between organizations has led them to seek a better understanding of customer behavior through innovative ways of storing and analyzing their information. Moreover, the emergence of new computing technologies has brought about major changes in the ability of organizations to collect, store and analyze macro-data. Therefore, over thousands of data can be stored for each customer. Hence, customer satisfaction is one of the most important organizational goals. Since all customers do not represent the same profitability to an organization, understanding and identifying the valuable customers has become the most important organizational challenge. Thus, understanding customers’ behavioral variables and categorizing customers based on these characteristics could provide better insight that will help business owners and industries to adopt appropriate marketing strategies such as up-selling and cross-selling. The use of these strategies is based on a fundamental variable, variety of products. Diversity in individual consumption may lead to increased demand for variety of products; therefore, variety of products can be used, along with other behavioral variables, to better understand and categorize customers’ behavior. Given the importance of the variety of products as one of the main parameters of assessing customer behavior, studying this factor in the field of business-to-business (B2B) communication represents a vital new approach. Hence, this study aims to cluster customers based on a developed RFM model, namely RFMV, by adding a variable of variety of products (V). Therefore, CRISP-DM and K-means algorithm was used for clustering. The results of the study indicated that the variable V, variety of products, is effective in calculating customers’ value. Moreover, the results indicated the better customers clustering and valuation by using the RFMV model. As a whole, the results of modeling indicate that the variety of products along with other behavioral variables provide more accurate clustering than RFM model.http://jist.ir/Article/14983Clustering Data Mining Customer Relationship Management Product Variety RFM Model