This first issue of CIT. Journal of Computing and Information Technology conveys five papers from the regular section, which address topics in computer networks, relational databases, knowledge discovery in customer relationship management, and natural language processing.</p

Vlado Glavinić

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iEditorialThis first issue of CIT. Journal of Computing and Information Technology conveys five papers fromthe regular section, which address topics in computer networks, relational databases, knowledgediscovery in customer relationship management, and natural language processing.Joyce Jose, Josna Jose and M. Princy in their paper titled A Survey on Privacy Preserving DataAggregation Protocols for Wireless Sensor Networks study wireless sensor networks (WSNs) aim-ing to increase lifetime of sensor nodes. Specifically, the authors concentrate on data aggregationas a security enhancement without compromising energy efficiency. In the paper they provide astudy of different privacy preserving data aggregation techniques used both to enhance energy andsecurity, based on a number of attributes such as types of network nodes, topology and encryptionsused for data aggregation.The second paper in this issue deals with Cognitive Radio, an intelligent radio that can dynamicallyaccess the radio spectrum allowing use of licensed spectrum without interfering with the primaryusers, but whose performance depends on the properties of the frequency band. In their paper titledA Review of Cross-layer Design in Dynamic Spectrum Access for Cognitive Radio Networks, G.Shine Let and G. Josemin Bala provide a comprehensive survey of cross-layer design in cogni-tive radio network; they also describe the need for modifications in the current cross-layer designapproaches.Serhiy Morozov, Hossein Saiedian and Hanzhang Wang focus on labeling schemes for hierarchicaldata. They propose an interesting solution, which is an improvement of the well-known primenumber labeling scheme, allowing multiple usage of the same prime numbers in the labeling pro-cess, thus producing smaller node labels. Their paper Reusable Prime Number Labeling Schemefor Hierarchical Data Representation in Relational Databases describes the respective algorithm.The proposed scheme can successfully be applied in situations where XML documents are storedin relational databases.A Constraint Guided Progressive Sequential Mining Waterfall Model for CRM by Bhawna Mallick,Deepak Garg and P. S. Grover introduces a Constraint Guided Progressive Sequential Mining Wa-terfall (CGP-SMW) model for the knowledge discovery process, which can be used for keepingfocus on mining the behaviors of customers in dynamic scenarios. The model is believed to helpin finding efficient and effective useful patterns from the customers’ data.The last paper in this issue, titled Rule-based Approach for Arabic Root Extraction: New Rulesto Directly Extract Roots of Arabic Words, is by Fatma Abu Hawas and Keith E. Emmert. Theauthors illustrate a new root-extraction approach for Arabic words, which relies only on the use ofrules that benefit from the relationships among letters of a word, instead of relying on a database ofword roots, a list of patterns, or even a list of prefixes and suffixes, as employed in the traditionalapproaches. Experimental results of this root extraction approach are promising, since about 96%of the current corpus contain long vowels, hence rules that can identify relationships among the longvowels and/or between the long vowels and the consonants could yield significant improvements.I would like to take this opportunity to inform you that we will be missing three of our currentEditors who are leaving the Editorial Board; these are Professors Ivan Futó, Eugenio Di Sciascioiiand Andreas Holzinger. We would especially like to highlight the work of our long-term EditorIvan Futó, as well as his continuing support to our publishing endeavor. His field of expertise withinCIT will be taken over by Professor Andrea Kő. Additionally, the band wagon will be joined, inthe role of Associate Editors, by a number of younger colleagues: Professors Siniša Šegvić, JanŠnajder, Domen Verber, as well as our present Assistant Editor Mincong Tang.Vlado GlavinićEditor-in-Chief

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