Journal of Computing and Information Technology (J Comput Inform Tech)

Publisher: Sveučilište u Zagrebu. University Computing Centre

Journal description

The aim of the international Journal of Computing and Information Technology (CIT) is to present original scientific and professional papers, as well as review articles and surveys, covering the theory, practice and methodology of computer science and engineering, modelling and simulation, and information systems.

Current impact factor: 0.00

Impact Factor Rankings

Additional details

5-year impact 0.00
Cited half-life 0.00
Immediacy index 0.00
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Website Journal of Computing and Information Technology website
Other titles Journal of computing and information technology (online), CIT
ISSN 1330-1136
OCLC 64201834
Material type Periodical, Internet resource
Document type Internet Resource, Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Many statistical and MOLAP applications use multidimensional arrays as the basic data structure to allow the efficient and convenient storage and retrieval of large volumes of business data for decision making. Allocation of data or data compression is a key performance factor for this purpose because performance strongly depends on the amount of storage required and availability of memory. This holds especially for data warehousing environments in which huge amounts of data have to be dealt with. The most evident consequence of data compression is that it reduces storage cost by packing more logical data per unit of physical capacity. And improved performance is a net outcome because less physical data need to be retrieved during scan-oriented queries. In this paper, an efficient data compression technique is proposed based on the notion of extendible array. The main idea of the scheme is to compress each of the segments of the extendible array using the position information only. We compare the proposed scheme for different performance issues with prominent compression schemes
    Journal of Computing and Information Technology 06/2015; 23(3):111-121. DOI:10.2498/cit.1002441
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    ABSTRACT: Congestion control and energy consumption in Wireless Multimedia Sensor Network is a new research subject which has been ushered in through the introduction of multimedia sensor nodes that are capable of transmitting large volume of high bit rate heterogeneous multimedia data. Most of the existing congestion control algorithms for Wireless Sensor Networks do not discuss the impact of security attacks by the malicious nodes in network congestion. Sensor nodes are prone to failure and malicious nodes aggravate congestion by sending fake messages. Hence, isolation of malicious nodes from data routing path reduces congestion significantly. Considering that, we have proposed a new Trust Integrated Congestion Aware Energy Efficient Routing algorithm, in which malicious nodes are identified using the concept of trust. The parameter Node Potential is computed, on the basis of the trust value, congestion status, residual energy and the distance of the node from the base station, using Fuzzy Logic Controller. The source node selects the node with the highest potential in its one hop radio range for data transmission which is light weight as well as energy efficient. Finally, merits of the proposed scheme are discussed by comparing them with existing protocols and the study exhibits 25% improvements in network performance.
    Journal of Computing and Information Technology 06/2015; 23(2). DOI:10.2498/cit.1002480
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    ABSTRACT: Eye tracking provides information about a user's eye gaze movements. For many years, eye tracking has been used in Human Computer Interaction (HCI) research. Similarly, research on computerised educational systems also relies heavily on students' interactions with systems, and therefore eye tracking has been used to study and improve learning. We have recently conducted several studies on using worked examples in addition to scaffolded problem solving. The goal of the project reported in this paper was to investigate how novices and advanced students learn from examples. The study was performed in the context of SQL-Tutor, a mature Intelligent Tutoring System (ITS) that teaches SQL. We propose a new technique to analyse eye-gaze patterns named EGPA. In order to comprehend an SQL example, students require the information about tables' names and their attributes which are available in a database schema. Thus, if students paid attention to the database schema, they would understand SQL examples more easily. We analysed students' eye movement data from different perspectives, and found that advanced students paid more attention to database schema than novices. In future work, we will use the findings from this study to provide proactive feedback or individualised amounts of information.
    Journal of Computing and Information Technology 06/2015; 23(2):171. DOI:10.2498/cit.1002627
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    ABSTRACT: Capacitated Vehicle Routing Problem (CVRP) is among transportation problems that are of the foremost concerns in logistics. Ensuring an effective product distribution over a large distribution network while reducing the required costs represents the scope of the present work. A synergic and interactive environment of parallel meta-heuristics is developed using a generalized island model to deal with large instances of CVRP. In the proposed model, cooperative meta-heuristics, namely genetic algorithms (GA) and ant colony optimization algorithms (ACO), are organized into archipelagoes. They communicate synchronously, globally and locally by exchanging solutions. In order to handle properly the migration of solutions, either between archipelagoes or between islands within the same archipelago, appropriate selection and replacement policies are adopted. Furthermore, the proposed approach uses other new features including a new binary solution representation and different optimization process (i.e GA, ACO) on each island. To prove the efficiency of the present work, tests over the well-known set of benchmarks, comparative studies and experimental analysis have been conducted.
    Journal of Computing and Information Technology 06/2015; 23(2):141. DOI:10.2498/cit.1002465
  • Journal of Computing and Information Technology 01/2015; 23(1):43. DOI:10.2498/cit.1002509
  • Journal of Computing and Information Technology 01/2015; 23(1):29. DOI:10.2498/cit.1002508
  • Journal of Computing and Information Technology 01/2015; 23(1):1 - 18. DOI:10.2498/cit.1002507
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    ABSTRACT: Relay selection has been regarded as an effective method to improve the performance of cooperative communication system. However, frequent operation of relay selection can bring enormous control message overhead and thereby decrease the performance of cooperative communication. To reduce the relay selection frequency, in this paper, we propose a relay selection scheme to choose the best relay with considering successive packets transmission. In this scheme, according to the length of data packet, data transmission rate and the estimated channel state information (CSI), the best relay is selected to maximize the number of successive packets transmission under the condition that the given symbol-error-rate (SER) is kept. Finally, numerical results show that the proposed relay selection scheme can support the operation of successive packets transmission in cooperative wireless networks and that the maximum number of successive packets transmission is affected by the different network parameters, i.e., data transmission rate, packet length and Doppler frequency at one relay node.
    Journal of Computing and Information Technology 01/2015; 22(4):217. DOI:10.2498/cit.1002423
  • Journal of Computing and Information Technology 01/2015; 23(1):19. DOI:10.2498/cit.1002513
  • Journal of Computing and Information Technology 01/2015; 22(4):227. DOI:10.2498/cit.1002407
  • Journal of Computing and Information Technology 01/2015; 23(3):269. DOI:10.2498/cit.1002645
  • Journal of Computing and Information Technology 01/2015; 23(3):255. DOI:10.2498/cit.1002493
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    ABSTRACT: RDF (Resource Description Framework) and RDF Schema (collectively called RDF(S)) are the normative language to describe the Web resource information. How to construct RDF(S) from the existing data sources is becoming an important research issue. In particular, UML (Unified Modeling Language) is being widely applied to data modeling in many application domains, and how to construct RDF(S) from the existing UML models becomes an important issue to be solved in the context of Semantic Web. By comparing and analyzing the characteristics of UML and RDF(S), this paper proposes an approach for constructing RDF(S) from UML and implements a prototype construction tool. First, we give the formal definitions of UML and RDF(S). After that, a construction approach from UML to RDF(S) is proposed, a construction example is provided, and the analyses and discussions about the approach are done. Further, based on the proposed approach, a prototype construction tool is implemented, and the experiment shows that the approach and the tool are feasible.
    Journal of Computing and Information Technology 01/2015; 22(4):237. DOI:10.2498/cit.1002459
  • Journal of Computing and Information Technology 01/2015; 23(1):87. DOI:10.2498/cit.1002516
  • Journal of Computing and Information Technology 01/2015; 23(3):191. DOI:10.2498/cit.1002490
  • [Show abstract] [Hide abstract]
    ABSTRACT: The extensive integration of information technologies in teaching and learning in the 21st century has initiated a dramatic change of educational paradigm. To a large extent this change was caused by the online education. A rapid growth of online university programs raises a number of new pedagogical, psychological and social issues. Online learning creates a learning environment that, compared to traditional, classroom-based education, is less personal, more independent, often fragmented, rarely systemic, distributed in space and time, and dependent on the learner rather than on the teacher. Many problems with online education (high attrition rate, orientation at highly skilled and highly motivated people, among other issues (The Trouble with Online College, 2013), indicate that one of its major challenges is not the technology itself or its classroom applications, but the lack of sound, research-based theoretical framework as the foundation of quality online learning. A comprehensive and effective educational theory is thus crucial for the quality education. This article makes an argument for such a theory and offers a model of online pedagogy for higher education with a focus on instruction and instructor, student autonomy, socialization through networking and collaboration in the online learning environment.
    Journal of Computing and Information Technology 01/2015; 23(1):61-74. DOI:10.2498/cit.1002511