In the current sixth year of publishing, ComSIS has undergone a partial restructuring of its Editorial Board. This issue of ComSIS is the first one completely prepared by the new management team which includes Mirjana Ivanović (Editor-in-Chief), Ivan Luković (Vice-Editor-in-Chief), Miloš Radovanović and Zoran Putnik (Managing Editors), and Srđan Škrbić, Vladimir Kurbalija, Jovana Vidaković, Ivan Pribela, and Slavica Aleksić (Editorial Assistants). On behalf of the present Editorial Board, we wish to thank all past members for the hard work, dedication, and passion invested into ComSIS. We would like to express special thanks to the former Editor-in-Chief, now Vice Editor-in-Chief, Ivan Luković, for his tireless efforts and years of devotion to the journal. We hope that the new Editorial Board of Computer Science and Information Systems will successfully continue, and build upon, the high standards and good practices established by our predecessors. We will do our outmost to maintain the established practice of timely publication of regular, as well as special issues of the journal, and further improve the quality of published papers and the journal itself. It will be a great pleasure for us if the readers, reviewers, and authors recognize our intention and efforts, and continue to support us in this mission.

We are very pleased to confirm that from 2008, starting with Vol. 5. No. 1, ComSIS is indexed and abstracted in the Science Citation Index Expanded and Journal Citation Report/Science Edition by Thomson Reuters. We are also delighted to announce that during the course of this year ComSIS has been selected for coverage in index and/or abstract by Scopus and EMBASE (Elsevier), Summon (Serials Solutions), Inspec (IET), and io-port (FIZ Karlsruhe), with pending decisions from a number of other database vendors.

The current issue of ComSIS continues the tradition of encompassing a wide array of subjects in the fields computer science and information systems, ranging from agent framework design to graph covering. The paper "Extensible Java EE-Based Agent Framework and Its Application on Distributed Library Catalogues" by Milan Vidaković, Branko Milosavljević, Zora Konjović, and Goran Sladić, introduces a new agent framework XJAF, based on Java EE technology, and discusses its application in distributed library catalogues – both for implementation of the central catalogue of a library information system, and metadata harvesting. A focal point of the system, discussed in more detail, is the inter-facilitator connection plug-in, which defines how multiple facilitators form an agent network.

Milan Zdravković and Miroslav Trajanović, in their paper "Integrated Product Ontologies for Inter-Organizational Networks", tackle the problem of improving the response of organizational networks in the task of information acquisition and management. The proposed approach and infrastructure involve a generalized model for semantic alignment of product information, whose purpose is to decrease human intervention in product data exchange, as well as uncover hidden design intent, automate referencing to related manufacturing competencies, and facilitate reuse of potential.

Currently, the abstract and concrete syntax of Web rule languages (e.g., SWRL, RuleML) are specified by separate and independent mechanisms. The paper "Model Transformations to Bridge Concrete and Abstract Syntax of Web Rule Languages," by Milan Milanović, Dragan Gašević, Adrian Giurca, Gerd Wagner, Sergey Lukichev, and Vladan Devedžić, bridges this gap using a bi-directional transformation defined in a model transformation language, discovering various issues in both Web rule language metamodels and textual syntax definitions, and contributing to making the two fully compatible.

The paper "A Call Detail Records Data Mart: Data Modelling and OLAP Analysis" by Dragana Ćamilović, Dragana Bečejski-Vujaklija, and Nataša Gospić, discusses the design and development of a call detail record and customer demographics data mart of a telecommunications company, focusing on the conceptual/logical/physical trilogy. It is demonstrated how the data mart, as a platform fro OLAP, can help the company to improve marketing and pricing strategies.

Marina Jovanović Milenković, Zoran Radojičić, Dejan Milenković, and Dragan Vukmirović, in the paper "Applying electronic documents in development of the healthcare information system in the Republic of Serbia," provide an overview of previous development of the healthcare information system of Serbia, discussing the information needs for describing the basic health process of every user.

The next two papers discuss applications of fuzzy logic and fuzzy sets. "An Approach to Fuzzy Database Querying, Analysis and Realisation", by Miroslav Hudec, presents a fuzzy generalized logical condition for the SQL WHERE clause, revealing the benefits of the approach through support for queries based on linguistic expressions, as well as several limitations of the fuzzy querying process.

In "The Adaptive Fuzzy Designed PID Controller Using Wavelet Network", Ibrahiem M. M. El Emary, Walid Emar, and Musbah J. Aqel present an approach to fuzzy adaptive control which uses a neural wavelet network (NWN) to overcome the drawbacks of classical PID controller, additionally tuned using a stochastic evolutionary search method. The advantages of the proposed approach are demonstrated through numerical simulations, showing the potential of the proposed methodology to add self-autonomy to system behavior.

The problem of missing values in gene expression data is studied by Mou'ath Hourani and Ibrahiem M. M. El Emary in "Microarray Missing Values Imputation Methods: Critical Analysis Review." Authors analyze the most common imputation methods, concluding that the local least square (LLS) and support vector regression (SVR) algorithms achieve best performance, also outlining the principal drawbacks of the algorithms manifested in the need for manual parameter tuning.

In her paper "Applications GeoGebra into Teaching Some Topics of Mathematics at the College Level", Ljubica Diković presents a methodological perspective on teaching college-level mathematics through the GeoGebra dynamic mathematics software package. The paper discusses the results of a didactic experiment where students were exposed to a method of teaching new to the departments, demonstrating a positive on student knowledge and understanding of the presented material.

The following two contributions focus on different aspects of dimensionality reduction. Zuojin Li, Weiren Shi, and Zhi Zhong, in "A Supervised Manifold Learning Method," present a classification method based on combining locally linear embedding (LLE) with linear discriminant analysis (LDA), with the goal of increasing inter-class variation, and decreasing the intra-class variation when samples are projected to a Fisher subspace, demonstrating the success of the method through experiments in handwritten digit recognition.

Ch. Aswani Kumar, on the other hand, presents an "Analysis of Unsupervised Dimensionality Reduction Techniques", by conducting a systematic comparison of dimensionality reduction techniques for the text retrieval task. The techniques are studied by observing their complexity, approximation error, and retrieval quality obtained.

Finally, the paper "On DRC-Covering of λKt(n) by Cycles", by Zhihe Liang, analyzes the problem of covering complete multipartite graphs with cycles, motivated by the design of survivable WDM networks where requests are routed on independently protected subnetworks, thus focusing on cycles in the coverings that satisfy the disjoint routing constraint.

On behalf of the new Editorial Board and the ComSIS Consortium, we would like to express our gratitude to all authors and reviewers for their hard and high-quality work, diligence, and enthusiasm.

Mirjana Ivanović

Managing Editor
Miloš Radovanović