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EVA as a Tool for Estimation of Management Eciency and Value Creation in Polish Telecom Sector, Journal of Telecommunications and Information Technology, 2016, nr 4
Get PDFThe paper presents results of empirical study on creation of added value in Polish telecom sector, based on Economic Value Added (EVA) indicator. First, an EVA analysis was performed for publicly traded telecom companies. Next, the eectiveness of EVA itself in management of telecom companies was evaluated. A statistical analysis was made to investigate dependence between EVA and other indicators of company value, confirming that EVA sign and magnitude are in agreement with indicators based on data from financial books. Finally, the effectiveness of using EVA for prediction of market capitalization of telecom companies was investigated. Overall results do not give a clear picture and cannot allow to state that EVA is a better determinant of value of telecom company than financial indicators like Earnings Per Share (EPS)
Telekomunikacja i Techniki Informacyjne, 2016, nr 1-2
Get PDFArtykuł omawia zagrożenia dla pasywnej infrastruktury telekomunikacyjnych sieci kablowych oraz metody monitoringu technicznego linii kablowych i obiektów bezobsługowych, zwłaszcza wykrywania i lokalizacji uszkodzeń kabli. Szczegółowo przedstawiono ograniczenia zasięgu i dokładności lokalizacji uszkodzeń kabli miedzianych i światłowodowych oraz opracowane w Instytucie Łączności elementy sprzętowe scentralizowanego systemu monitoringu SMIT
New Developments in a Two-criteria Approach to Dynamic Power Management in Energy-aware Computer Networks, Journal of Telecommunications and Information Technology, 2016, nr 2
Get PDFIn the paper authors continue the development of a model of dynamic power management in energy-aware computer networks, where two criteria: energy consumption and the quality of service are considered. This approach is appropriate when the routing problem with fixed demands is inadmissible. The formulation introducing edge indices is modified and tests on problems of different sizes are performed
A Novel Technique of Optimization for the COCOMO II Model Parameters using Teaching-Learning-Based Optimization Algorithm, Journal of Telecommunications and Information Technology, 2016, nr 1
Get PDFSoftware cost estimation is a critical activity in the development life cycle for controlling risks and planning project schedules. Accurate estimation of the cost before the start-up of a project is essential for both the developers and the customers. Therefore, many models were proposed to address this issue, in which COCOMO II has been being widely employed in actual software projects. Good estimation models, such as COCOMO II, can avoid insufficient resources being allocated to a project. However, parameters for estimation formula in this model have not been optimized yet, and so the estimated results are not close to the actual results. In this paper, a novel technique to optimize the coefficients for COCOMO II model by using teaching-learning-based optimization (TLBO) algorithm is proposed. The performance of the model after optimizing parameters was tested on NASA software project dataset. The obtained results indicated that the improvement of parameters provided a better estimation capabilities compared to the original COCOMO II model
Multicast Connections in Wireless Sensor Networks with Topology Control, Journal of Telecommunications and Information Technology, 2016, nr 1
Get PDFThe article explores the quality of multicast trees constructed by heuristic routing algorithms in wireless sensor networks where topology control protocols operate. Network topology planning and performance analysis are crucial challenges for wire and wireless network designers. They are also involved in the research on routing algorithms, and protocols for these networks. In addition, it is worth to emphasize that the generation of realistic network topologies makes it possible to construct and study routing algorithms, protocols and traffic characteristics for WSN networks
Monitoring of a Cloud-Based Environment for Resilient Telecommunication Services, Journal of Telecommunications and Information Technology, 2016, nr 1
Get PDFThis article depicts insights and in-depth presentation of a new tool, specifically designed for Data Center resources monitoring purpose. It enables physical and virtual resources monitoring and is capable of performing advanced analysis on the resulting, measured data. Here in presented are exemplary scenarios conducted over the proprietary Data Center unit, delivering specific information on the behavior of the analyzed environment. Presented results create a base layer for a high level resiliency analysis of telecommunication services
Self-organization and Routing Algorithms for the Purpose of the Sensor Network Monitoring Environmental Conditions on a Given Area, Journal of Telecommunications and Information Technology, 2016, nr 4
Get PDFThe article describes an implementation of wireless sensor network (WSN) based on the IEEE 802.15.4-2006 standard, which was designed to monitor environmental conditions (e.g. temperature, humidity, light intensity, etc.) on a given area. To carry out this task, a self-organization algorithm called KNeighbors was selected. It exhibits low computational complexity and is satisfactory with respect to energy consumption. Additionally, the authors proposed a novel routing algorithm and some modifications to the MAC layer of the IEEE 802.15.4 standard. The article discusses the selected algorithms and procedures that were implemented in the network
Heavy Gas Cloud Boundary Estimation and Tracking using Mobile Sensors, Journal of Telecommunications and Information Technology, 2016, nr 3
Get PDFThis paper addresses issues concerned with design and managing of monitoring systems comprised of mobile wireless sensing devices (MANETs). The authors focus on self-organizing, cooperative and coherent networks that maintain a continuous communication with a central operator and adopt to changes in an unknown environment to achieve a given goal. The attention is focused on the development of MANET for heavy gas clouds detection and its boundary estimating and tracking. Two strategies for constructing the MANET are described, in which sensors explore the region of interest to detect the gas cloud, create temporary network topology and finally, cover the cloud boundary, and track the moving cloud. The utility and efficiency of the proposed strategies has been justified through simulation experiments
QoS Requirements as Factor of Trust to 5G Network, Journal of Telecommunications and Information Technology, 2016, nr 1
Get PDFTrust to modern telecommunications networks plays an important role as a driver of technological and market success of any technology or telecommunication services. Most of the technological approaches to this problem are focused only on network security and do not include such a factor as the quality of service (QoS), which also plays an important role in the formation of trust both from the consumers and the regulator. The future 5G mobile technology will be the engine of development of telecommunications until 2020 and the formation of trust to the 5G networks is one of the main tasks for developers. The authors present the view on the trust to 5G networks in the plane of QoS requirements formation and QoS management. QoS requirements to 5G networks were determined on the basis of three main business models of services: xMBB, M-MTC and U-MTC and the need to ensure user trust to networks. Infrastructure requirements for QoS control and spectrum management network entities which are based on Network Function Virtualization (NFV) principles have been formed
System SIST jako baza wiedzy o systemach teleinformatycznych administracji publicznej, Telekomunikacja i Techniki Informacyjne, 2016, nr 1-2
Get PDFArtykuł opisuje opracowany w Instytucie Łączności System Inwentaryzacji Systemów Teleinformatycznych – SIST, przeznaczony do wykorzystania przez Ministerstwo Administracji i Cyfryzacji, jako narzędzie do monitorowania rozwoju systemów, rejestrów i usług e-administracji. W SIST są zbierane informacje o systemach, rejestrach i usługach publicznych już wdrożonych do eksploatacji, będących w trakcie realizacji lub planowanych do realizacji. Informacje dotyczą możliwości technicznych i funkcjonalnych systemów informatycznych oraz kosztów i sposobu finansowania inwestycji teleinformatycznych w sektorze publicznym. Gromadzone w nim informacje, po przetworzeniu, mogą być wykorzystane do prowadzenia analiz i prezentacji wskaźników pozwalających na ocenę stanu infrastruktury teleinformatycznej e-administracji i usług oraz perspektyw ich rozwoju