International Journal of Computers and Communications

E-ISSN: 2074-1294
Volume 7, 2013

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Issue 1, Volume 7, 2013 

Title of the Paper: The Design and Implementation of Two New IT Service Management Models


Authors: Anel Tanovic, Fahrudin Orucevic

Pages: 1-12

Abstract: IT Service Management is a scientific discipline which is responsible for giving instructions connected to the management of IT services. Information Technology Infrastructure Library (ITIL) is the most popular framework for the management of IT services which consists of five phases and 26 processes. ISO/IEC 20000 is the first and only international standard responsible for the management of IT services which consists of four phases and 13 processes. The aim of this paper is to give proposal for the design of two new models of IT Service Management models. The first one is a performed version of ISO/IEC 20000 model which is the result of the comparison with ITIL framework. The second one is a performed version of ITIL 2011 framework which is the result of the comparison with ISO/IEC 20000 standard. Both models are produced in the test environment of IP Multimedia Subsystem (IMS system) in one Telecom operator in Bosnia and Herzegovina. Improvements are done by adding new processes into both process models. New processes which are added into a performed version of ISO/IEC 20000 model are: Event Management, Demand Management, Service Portfolio Management and Service Validation and Testing process. New processes which are added into a performed version of ITIL model are: Business Relationship Management and Supplier Management. Both new models are universal and their application could be in every type of the industry.

Title of the Paper: Theory of FSMs Sharing Internal States


Authors: Vit Fabera

Pages: 13-17

Abstract: The paper presents theory of two FSMs that share internal states or input symbols. Modified definitions of FSMs are presented and two reciprocal meaningful transformations between the pair of FSMs sharing input symbols and the pair sharing internal states are constructed. Transformations are based on Mealy to Moore FSM and Moore to Mealy FSM transformations. Conditions of transformations are discussed and minimization of FSMs is shown. Practical aspects are discussed.

Title of the Paper: Theoretical Analysis of BER Performance of Optical ZCZ-CDMA System


Authors: Takahiro Matsumoto, Hideyuki Torii, Shinya Matsufuji

Pages: 18-25

Abstract: In this paper, we analyze the bit error rate (BER) performance of optical code division multiple access (CDMA) system based on the optical zero-correlation zone (ZCZ) code with zerocorrelation zone 4n2 or 1 which is called the optical ZCZ-CDMA system, by the electrical and optical processing over the optical fiber and space by computer simulation and theoretical formula. In the optical fiber transmission of this system, the effect of the avalanche photodiode (APD) noise, thermal noise and co-channel interference are considered. Additionally, the effects of the scintillation and background noise are considered in the optical space transmission of this system. The optical ZCZ code, which is a set of pairs of binary and biphase sequences consisting of 1 or 1 with zero-correlation zone, may be able to provide optical CDMA communication system suppressed co-channel interference, and we have proposed the compact construction of a code generator and a bank of matched filters for this code. As a result, the BER performance of optical ZCZ-CDMA system over the optical space go down compared to that over the optical fiber, and the BER performance of this system by the electrical processing go down compared to that by the optical processing, and this system can’t remove completely co-channel interference.

Issue 2, Volume 7, 2013

Title of the Paper: Evaluation of Information Support Management by Using Web Applications


Authors: L. Lukas, L. Necesal, A. Paduchova

Pages: 27-34

Abstract: Human activities and processes are determined by using of knowledge and information. It is impossible to imagine any meaningful implementation of activities without an information support. There is an important role of information in point of view of individual person but in point of view of whole organization too. Information sharing means important synergic effect in organization. Currently the possibility of fulfilling the information needs of managers achieved a high level, thanks to the development of information technology. However, information support of their activities mostly don´t achieve possible qualities. One of the ways to effectively use modern information technology to satisfy the information needs is using of web applications to create questionnaires. The article discusses the concept of information support activities like a method of evaluation using multicriteria evaluation methods. A part of this paper is the consequent implementation of questionnaire as a tool for the evaluation of information support and analysis of available applications.

Title of the Paper: Mathematical Model Based Software Design for Simulation of 4G Wireless Protocols


Authors: E. Kacerginskis, L. Narbutaite

Pages: 35-43

Abstract: Implementation of new generation wireless networks is a challenging task that requires detail network planning and protocol level simulation in order to foresee possible problems and save investment and operation costs. Existing simulation platforms are very complex, expensive and vendor specific. It requires special knowledge for modifying and adopting protocols. This article presents Authors’ designed mathematical model and model based software that allows universal packet level simulation of different wireless protocols. Software provides graphical user interface that allows to describe simulated protocol, control simulation, analyze time flow diagrams and graphical QoS results for different access and connectivity network nodes. In addition to article presents mobile WiMAX handover simulation example and provides QoS calculation results that prove the importance of network simulation prior to implementing real network in order to be able to foresee possible bottlenecks and plan required overheads.

Title of the Paper: New Interactive Platform for New Distributed Work Environments


Authors: Emanuil Rednic, Andrei Toma, Anca Apostu

Pages: 44-53

Abstract: Recent advances in information technology and latest changes in social and economic environment have deteremined important changes in individual workers or organizations behaviours. By aiming to present the way to gamify any e-business tools employed at either intranet level or internet level, this article presents the instruments description which should be used with this purpose. In the gamification process involved in the transformation of standard tools such as office tools, document management tools, security tools, it is mandatory to clarify the main concepts, such as game thinking, possible game elements, incentives and the psychology of motivation. As more and more individuals and organizations explore various types of distributed work arrangements, we intend to present these aspects in detail in the present paper in order to attain a preliminary definition of a gamification design framework in order to formalize the most important design choices.

Issue 3, Volume 7, 2013

Title of the Paper: Scheduling Jobs and Batches Based on Historical Data


Authors: Richárd Kápolnai, Imre Szeberényi

Pages: 55-63

Abstract: This paper considers the problem of minimizing the makespan when scheduling jobs of unknown length on identical machines, meaning there is no a priori information on the job lengths. However, as the user of a parallel computational infrastructure is assumed to repeat the execution of the jobs multiple times and is able to measure individual machine completion times, a historical database is proposed to aid the approximation of the optimal schedule. We limit the size of this database so any set of jobs assigned to a machine has to be briefly described with limited data so an arbitrary feasible schedule may not be suitable. Two job models are studied: the Parameter Sweep Application (PSA) model which can be regarded as a set of jobs without dependency or inter-communication requirements, and the Batches of PSAs (BPSA) model where the jobs are executed in batches to be preceded by a sequence independent setup work. We propose an iterative framework which repeats computing an approximate schedule, executing the PSA or BPSA and updating the historical database according to the machine completion times. After each iteration, the approximation algorithm further improves some upper bound on the makespan until a 2-approximation is reached in case of PSA, 3-approximation in case of BPSA. The scheduling algorithm always assigns consecutive jobs called chains to machines keeping the historical database and the machine assignment descriptions brief.

Title of the Paper: Network Architecture and Resource Management Framework for Convergence of Mobile and Optical Access Networks


Authors: Theofanis G. Orphanoudakis, Evangelos A. Kosmatos, George Lyberopoulos, Dimitrios Kagklis, Stelios Sartzetakis, Konstantinos Demestichas

Pages: 64-72

Abstract: The increasing demand for converged media services across Europe promotes the deployment of a range of broadband network technologies. Existing and emerging services that become available to the end user are currently supported by wireline access technologies such as relatively limited capacity cable modems, and ADSL or high capacity FTTx/VDSL as well as wireless technologies such as HSDPA, WiFi and WiMax. However, in order to achieve the required data rate, cell distances have to be small. This will result in a large number of cells to be interconnected to the mobile backhaul network. Serving a large number of cells with point to point links is extremely inefficient. This makes backhaul architectures based on Passive Optical Networks (PONs) very attractive. In this convergent networking scenario seamless mobility across this heterogeneous network infrastructure and service portability across segments of different technologies still face severe limitations. While international standards evolve to enable interoperability there is still a need for an integrated resource management framework and flexible service delivery mechanisms. A main objective is to achieve superior performance in terms of capacity, dynamic resource allocation, Quality of Service (QoS) and flexible service provisioning models supporting fast network reconfiguration, efficient network management and reduced cost (CapEx/OpEx). In this work we present an architecture and a resource allocation framework that allow autonomic operation and Service Level Agreement (SLA) negotiation between the mobile network operator (MNO) and the backhaul provider.

Title of the Paper: First Steps in Designing Air Traffic Control Communication Language Technology System - Compiling Spoken Corpus of Radiotelephony Communication


Authors: Mira Pavlinović, Damir Boras, Ivana Francetić

Pages: 73-80

Abstract: One of the most essential parts of air traffic control is communication. It helps air traffic controllers and pilots operate the plane and maintain safe and expeditious flight. A survey of the NASA Aviation Safety Reporting System database has identified that lack of radiotelephony communication skills and discipline by pilots and controllers is a causal or circumstantial factor in 80% of incidents or accidents. The goal of this paper is to provide an overview of spoken corpus of radiotelephony phraseology recorded on the frequencies of Zagreb Approach and Tower Control. The spoken corpus of radiotelephony communication has been compiled and will be used as a basis for designing a language technology system that should spot deviations from the prescribed usage of radiotelephony communication. The recordings have been made during peak hours of traffic at Zagreb Airport Pleso. Out of recorded forty hours, twenty hours (ten hours of communication from Zagreb Approach Control and ten hours from communication on Tower Control) have been selected to be transcribed and incorporated into the language technology system. Although the designed corpus of spoken radiotelephony communications was recorded in Croatian airspace and is relatively small, it is found to be representative for radiotelephony language used in Europe and therefore applicable to any research in European radiotelephony communications.

Title of the Paper: Reconfigurable Cost Effective Design of Digital Up Converter for Mobile Communication


Authors: Rajesh Mehra, S. S. Pattnaik

Pages: 81-89

Abstract: In this paper cost effective reconfigurable WCDMA DUC design has been presented for mobile communication base stations. The WCDMA DUC has been designed and implemented by combining the multiplier less and multiplier based techniques to achieve an optimized hybridized solution for mobile applications. The different sections of DUC have been optimized separately and then combined together. The Park McClellan algorithm has been used for optimal filter length to reduce hardware requirements along with computationally efficient polyphase decomposition technique to optimize both speed and area. The embedded multipliers and LUTs of target FPGA are efficiently utilized to enhance the system performance. The proposed DUC has been designed with Matlab, synthesized with Xilinx Synthesis Tool (XST) and implemented on Virtex-II Pro based xc2vp30-7ff896 FPGA device. The developed DUC can operate at a maximum frequency of 147 MHz by efficiently utilizing the resources available on target FPGA to provide cost effective solution for SDR based wireless applications.

Title of the Paper: Analysis of the Effects of Front and Back Lights in Chroma Key Effects During Implementation in Virtual TV Studio


Authors: Branimir S. Jaksic, Boris Gara, Mile B. Petrovic, Petar Lj. Spalevic, Ivana M. Milosevic

Pages: 90-97

Abstract: In this paper, the analysis of the effects of front and back light in chroma key effect in the realization of a virtual TV studio, is explored. The analysis was done for the case with variable and the case with fixed values for the front and the back light. The tolerance range of colors is set with the software package Adobe After Effects adn it is set for the different values and combinations of lights. The results are presented graphically. Based on these results, we can determine which combination of light and volume gives high quality images at the exit of a virtual studio.

Issue 4, Volume 7, 2013

Title of the Paper: Technical Requirements of Experiment Support Software for Huge-Scale Network Environment


Authors: Shingo Yasuda, Kunio Akashi, Masatoshi Enomoto, Shinsuke Miwa, Yoichi Shinoda

Pages: 99-106

Abstract: Network testbed has developed experiment software which supports operations of testbed experiments. In recent years, the experimenters utilize virtualization technologies such as KVM and Xen to expand the scale of experimental environment. By contrast, current experiment support software does not have enough functions for such an experiment environment. As a result, the experimenters often encounter some sort of stumbling block when constructing huge-scale experiment environment. In this paper, we investigate the technical requirements of experiment support software for huge-scale network environment by analyses and considerations.

Title of the Paper: Traffic Characterization for Flexible Service Delivery in Next-Generation Converged Access Networks


Authors: Evangelos A. Kosmatos, Theofanis G. Orpahnoudakis, Helen C. Leligou, Eleftherios Tsampasis

Pages: 107-115

Abstract: The evolution towards converged access networks and the importance of quality of experience at an affordable cost brings the need for access networks that can offer a wide range of services not currently available to the desired extent. Legacy networks used explicit signaling that traversed all nodes along the path to book resources before the launch of the media stream. This approach does not scale and cannot provide adequate resource control and Service Level Agreement (SLA) management in scalable and autonomous packet networks. Still, the need to reserve resources in advance remains since real-time services have limited, if any, means of adjusting their rates to the prevailing network conditions. Hence, in order to preserve customer satisfaction, the traditional preventive approach that reserves resources for the duration of the session is the only option. This paper proposes a measurement based approach to derive the flow resource needs and then trigger the Resource and Admission Control enriching the network with implicit admission control. We evaluate the proposed methodology against other approaches that employ measurement based Effective Bandwidth estimation and demonstrate its noticeable performance in terms of achievable resource utilisation, accuracy and practical feasibility.

Title of the Paper: Design Considerations of a Large Granule Dynamic Reconfigurable Fabric


Authors: Mua’ad M. Abu-Faraj

Pages: 116-123

Abstract: Dynamically reconfigurable systems can provide wideranging support to processors as an adjunct to their usual Instruction Set Architectures. We describe the basic architectural features of an out-of-core dynamically reconfigurable fabric having predictive reconfiguration. The Out-Of-Core Reconfigurable Fabric (OOCRF) is intended for eventual extra-ISA support in a multicore architecture. In this paper we focus on the basic architectural structure of the fabric as it relates to a single core and give some simple examples of its use in (multi) register to (multi) register vector processing. In particular we introduce the notion of a composite configuration block and show how prefetching of configuration controls can be tied to standard instruction stream speculation. We also consider certain issues that can arise when a Dynamically Reconfigurable Fabric (DRF) is shared in a multicore system. We briefly describe three architectures supporting different multithreading models, and describe the role of authenticating locks for providing some form of hardware-based secured access to the DRF.

Title of the Paper: Intelligent Internet: Natural Language and Question & Answer Based Interaction


Authors: Emdad Khan

Pages: 124-134

Abstract: We propose to convert today’s Internet into an Intelligent Internet that can be easily used by all people – literate, semi-literate and illiterate – in much more useful, effective and valuable ways. E.g. if we type “how many students graduated from Stanford University in Computer Science in 2012?” in any search engine today, the results will be things like “Stanford university Palo Alto; Stanford university campus; computer science at Stanford etc etc”. The real answer will not be there as the question was not understood to begin with let alone figuring out the answer. In order to get the correct answer, we need two broad parts from technical standpoint: one is natural language based interface that clearly understands user’s requests, and the other one is an engine that can take necessary actions & provide the most appropriate answer. Speaking boldly, we are talking about a robust Question & Answer (Q & A) system with a very large domain. Handling of such a large domain is possible through a Semantic Engine. We have applied the Intelligent Internet (IINT) concept for farmers as the need to provide the benefits of the Information Age to farmers, the major segment of the Base of the Pyramid people (BOP), is very important from various aspects including their survivability, Economic, Social, Cultural and other developments, and minimizing the Digital Divide & Rich-Poor gap. Since many farmers are illiterate, live in rural areas where Internet Access is limited, and cannot easily afford high end mobile devices, existing methods have severe limitations in providing the benefits of the Information Age to such population. We describe a practical affordable solution using IINT applied to a Farming Mega Portal (FMP) that can be accessed from any phone using user’s voice and natural language. Our approach includes information access, interaction, e-Learning, transaction and social network aspect so that farmers can effectively use FMP to improve & increase food production and minimize food waste. We emphasize on Innovation and Entrepreneurship for farmers to ensure immediate and sustainable significant impact on Economic, Social and Cultural & other developments, along with creation of an enormous “Resource ”. The IINT will take the Internet to a new level and will allow existing as well as significant number of new users to enjoy the existing and various new benefits of the Internet, and affect their lives in a positive way with Economic, Social, Cultural and other developments globally.

Title of the Paper: A Web-Stress Evaluation on an On-line In-service Training Course


Authors: Lung-Hsing Kuo, Jui-Chen Yu, Hsieh-Hua Yang, Wen-Chen Hu, Hung-Jen Yang

Pages: 135-144

Abstract: There is a need to maintain web-service according to the real traffic required. The purpose of this study was to demonstrate how to apply traffic-stress on a web-based course of for adjusting learning activities. This sampled course is part of formal high school education for the technology Education subject under High-Scope Project. For integrating emerging technology into high-school learning content, the High-Scope Project had established for five years and is in the second stage. The digitizing course evaluation standard was applied to ensure the virtual learning quality. Based upon the evaluators' consistency, the reliability was reached 0.931. There are ten lessens. Those are "Introduction of Green Energy", "Characteristics and Application of Green Energy", "Green Energy Developing and Environmental Issues", "Principle and Application of Solar Energy", " Principle and Application of Fuel cell", " Principle and Application of Wind Energy", " Principle and Application of Hydraulic Energy", "The Trend of Green Energy Development", "The Industry of Green Energy", "The Impact of Green Technology". Based upon the evaluation results, it was confirmed that this web-based course is digital learning qualified.