Autor: Arabas, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Energy Aware Data Centers and Networks: a Survey
Autorzy:: Arabas, P.
Powiązania:: https://bibliotekanauki.pl/articles/308876.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: energy eﬃciency
green networks
resource allocation
HPC
Opis:: The past years have brought about a great variety of clusters and clouds. This, combined with their increasing size and complexity, has resulted in an obvious need for power-saving control mechanisms. Upon presenting a basis on which such solutions - namely low-level power control interfaces, CPU governors and network topologies – are constructed, the paper summarizes network and cluster resources control algorithms. Finally, the need for integrated, hierarchical control is expressed, and speciﬁc examples are provided.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 4; 26-36
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Periodic Coordination in Hierarchical Air Defence Systems
Autorzy:: Arabas, P.
Malinowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/908340.pdf
Data publikacji:: 2001
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: system hierarchiczny
system wspomagający wypracowanie decyzji
missile defence
hierarchical systems
coordination
decision support systems
Opis:: The subject of this work is the defence planning of a point target against an air attack. The defence system is decomposed into a number of sectors. A direct method of coordination is used at the upper level, while the sectors use a discrete-time event-based model and the description of uncertainty by multiple scenarios of an attack. The resulting problems are solved using linear programming. A comparison of two coordination strategies for realistic attack scenarios and an analysis of effectiveness are provided.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2001, 11, 2; 493-513
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Server Workload Model Identification: Monitoring and Control Tools for Linux
Autorzy:: Karpowicz, M.
Arabas, P.
Powiązania:: https://bibliotekanauki.pl/articles/307868.pdf
Data publikacji:: 2016
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: cloud computing
energy efficiency
Linux
server performance meterin
Opis:: Server power control in data centers is a coordinated process carefully designed to reach multiple data center management objectives. The main objectives include avoiding power capacity overloads and system overheating, as well as fulfilling service-level agreements (SLAs). In addition to the primary goals, server control process aims to maximize various energy efficiency metrics subject to reliability constraints. Monitoring of data center performance is fundamental for its efficient management. In order to keep track of how well the computing tasks are processed, cluster control systems need to collect accurate measurements of activities of cluster components. This paper presents a brief overview of performance and power consumption monitoring tools available in the Linux systems.
Źródło:: Journal of Telecommunications and Information Technology; 2016, 2; 5-12
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Application of Social Network Inferred Data to Churn Modeling in Telecoms
Autorzy:: Gruszczyński, W.
Arabas, P.
Powiązania:: https://bibliotekanauki.pl/articles/308695.pdf
Data publikacji:: 2016
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: churn reduction
classification
social networks
Opis:: The subject of this work is the use of social network analysis to increase the effectiveness of methods used to predict churn of telephony network subscribers. The social network is created on the basis of operational data (CDR records). The result of the analysis is customer segmentation and additional predictor variables. Proposed hybrid predictor employs set of regression models tuned to specific customer segments. The verification was performed on data obtained from one of the Polish operators.
Źródło:: Journal of Telecommunications and Information Technology; 2016, 2; 77-86
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dynamic Contracting of IP Services - System Architecture and Prototype
Autorzy:: Arabas, P.
Kamola, M.
Powiązania:: https://bibliotekanauki.pl/articles/309102.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: DiffServ
dynamic contracts
IP network
quality of service
Opis:: Proposition of architecture and implementation of prototype system for dynamic contracting IP services is presented. The system serves requests issued by users demanding setting up network service of specified parameters. DiffServ technology together with traffic engineering and admission control are used. Implementation details and results of tests are described. Necessary extensions and possibility of commercialization of such a system are discussed.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 2; 43-52
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Network resilience analysis: review of concepts and a country level. Case study
Autorzy:: Kamola, M.
Arabas, P.
Powiązania:: https://bibliotekanauki.pl/articles/305270.pdf
Data publikacji:: 2014
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: network resilience
valley-free path
autonomous system geolocation
Opis:: This paper presents the rationale behind performing an analysis of Internet resilience in the sense of maintaining a connection of autonomous systems in the presence of failures or attacks — on a level of a single country. Next, the graph of a network is constructed that represents interconnections between autonomous systems. The connectivity of the graph is examined for cases of link or node failure. Resilience metrics are proposed, focusing on a single autonomous system or on overall network reliability. The process of geographic location of networking infrastructure is presented, leading to an analysis of network resilience in the case of a joint failure of neighboring autonomous systems.
Źródło:: Computer Science; 2014, 15 (3); 311-327
1508-2806
2300-7036
Pojawia się w:: Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Dynamically established transmission paths in the future Internet - proposal of a framework
Autorzy:: Kamola, M.
Arabas, P.
Powiązania:: https://bibliotekanauki.pl/articles/200131.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: data path
QoS
interconnection
Future Internet
NGN
services marketplace
Opis:: An idea of a global system for dynamic contracting data paths in the global IP network is presented. System scalability and efficiency is based on the current natural hierarchy of Internet providers. Architecture of the bandwidth market service accomplishing operation of such system is outlined. Benefits from dynamic provisioning of such dedicated paths with QoS guarantees are shown. Utilization of various technologies for this system is discussed.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 357-366
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Simultaneous routing and flow rate optimization in energy-aware computer networks
Autorzy:: Jaskóła, P.
Arabas, P.
Karbowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/331329.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: MINLP
MIQP
network optimization
green networking
fairness
multicriteria
optymalizacja sieci
wielokryterialność
Opis:: The issue of energy-aware traffic engineering has become prominent in telecommunications industry in the last years. This paper presents a two-criteria network optimization problem, in which routing and bandwidth allocation are determined jointly, so as to minimize the amount of energy consumed by a telecommunication infrastructure and to satisfy given demands represented by a traffic matrix. A scalarization of the criteria is proposed and the choice of model parameters is discussed in detail. The model of power dissipation as a function of carried traffic in a typical software router is introduced. Then the problem is expressed in a form suitable for the mixed integer quadratic programming (MIQP) solver. The paper is concluded with a set of small, illustrative computational examples. Computed solutions are implemented in a testbed to validate the accuracy of energy consumption models and the correctness of the proposed traffic engineering algorithm.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2016, 26, 1; 231-243
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analysis and Modeling of Domain Registration Process
Autorzy:: Arabas, P.
Jaskóła, P.
Kamola, M.
Karpowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/309217.pdf
Data publikacji:: 2012
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: domain market
domain registration
forecasting
time series modeling
Opis:: The paper presents analysis of the domain name reservation process for the polish .pl domain. Two models of various time scale are constructed and finally combined to build long range high resolution model. The results of prediction are verified using real data.
Źródło:: Journal of Telecommunications and Information Technology; 2012, 2; 63-73
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Energy-saving Algorithms for the Control of Backbone Networks: A Survey
Autorzy:: Kamola, M.
Niewiadomska-Szynkiewicz, E.
Arabas, P.
Sikora, A.
Powiązania:: https://bibliotekanauki.pl/articles/307968.pdf
Data publikacji:: 2016
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: green routing
mixed-integer programming
OSPF heuristics
power-save networks
Opis:: The rapid growth of energy demand by wired IP networks can be mitigated on hardware and software levels. While upgrading to more efficient transmission media still brings biggest savings, we take a look here at power-saving algorithms that combine the capability of setting networking equipment in arbitrary energy states which, combined with profound knowledge of the network traffic matrix, leads to considerable complex optimization problem formulations. Alternatively, lightweighted heuristic approaches are presented, built on much simpler network model but still capable to perform energy-efficient traffic engineering.
Źródło:: Journal of Telecommunications and Information Technology; 2016, 2; 13-20
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Performance Evaluation of Signaling in the IP QoS System
Autorzy:: Tarasiuk, H.
Śliwiński, J.
Arabas, P.
Jaskóła, P.
Góralski, W.
Powiązania:: https://bibliotekanauki.pl/articles/307864.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: IP QoS System
quality of service
signaling system
Opis:: The IP QoS System is based on next generation networks (NGN) and differentiated services (DiffServ) architectures. Its main part is a signaling system, which allows to send a request from a user to the system for establishing new connection with predefined quality of service assurance. In this paper we present trial results of the proposed signalling system. The experiments were performed to measure setup delay utilizing artificial call generator/analyzer. To obtain results we assumed different distributions of interarrival and call holding times based on the literature. The results show that the setup delay strongly depends on access time to network devices, however also on the assumed call holding time models.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 3; 12-20
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Maintaining the feasibility of hard real-time systems with a reduced number of priority levels
Autorzy:: Qureshi, M. B.
Alrashed, S.
Min-Allah, N.
Kołodziej, J.
Arabas, P.
Powiązania:: https://bibliotekanauki.pl/articles/330305.pdf
Data publikacji:: 2015
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: real time system
feasibility analysis
fixed priority scheduling
rate monotonic algorithm
online scheduling
system czasu rzeczywistego
analiza wykonalności
algorytm szeregowania
Opis:: When there is a mismatch between the cardinality of a periodic task set and the priority levels supported by the underlying hardware systems, multiple tasks are grouped into one class so as to maintain a specific level of confidence in their accuracy. However, such a transformation is achieved at the expense of the loss of schedulability of the original task set. We further investigate the aforementioned problem and report the following contributions: (i) a novel technique for mapping unlimited priority tasks into a reduced number of classes that do not violate the schedulability of the original task set and (ii) an efficient feasibility test that eliminates insufficient points during the feasibility analysis. The theoretical correctness of both contributions is checked through formal verifications. Moreover, the experimental results reveal the superiority of our work over the existing feasibility tests by reducing the number of scheduling points that are needed otherwise.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 709-722
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Incrementally Solving Nonlinear Regression Tasks Using IBHM Algorithm
Autorzy:: Zawistowski, P.
Arabas, J.
Powiązania:: https://bibliotekanauki.pl/articles/308427.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: black-box modeling
neural networks
nonlinear approximation
nonlinear regression
support vector regression
weighted correlation
Opis:: This paper considers the black-box approximation problem where the goal is to create a regression model using only empirical data without incorporating knowledge about the character of nonlinearity of the approximated function. This paper reports on ongoing work on a nonlinear regression methodology called IBHM which builds a model being a combination of weighted nonlinear components. The construction process is iterative and is based on correlation analysis. Due to its iterative nature, the methodology does not require a priori assumptions about the final model structure which greatly simplifies its usage. Correlation based learning becomes ineffective when the dynamics of the approximated function is too high. In this paper we introduce weighted correlation coefficients into the learning process. These coefficients work as a kind of a local filter and help overcome the problem. Proof of concept experiments are discussed to show how the method solves approximation tasks. A brief discussion about complexity is also conducted.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 4; 65-72
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Praktyczne aspekty modelowania i optymalizacji procesów przemysłowych
Practical aspects of modelling and optimizing industrial processes
Autorzy:: Arabas, J.
Domański, P.
Świrski, K.
Powiązania:: https://bibliotekanauki.pl/articles/151253.pdf
Data publikacji:: 1998
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Opis:: Omówiono niektóre możliwości wykorzystania zaawansowanych metod sterowania w systemach DCS. Sformułowano problemy aproksymacji odwzorowań i analizy skupień wykorzystywane w modelowaniu procesów przemysłowych. Przedstawiono narzędzia modelowania, klasyfikowane jako sztuczne sieci neuronowe i systemy z logika rozmytą. Omówiono wybrane metody wykorzystania modeli do sterowania i monitorowania procesu. Podano przykłady wykorzystania technik neuronowych i rozmytych w modelowaniu, monitorowaniu i sterowaniu, wzięte z dotychczasowych doświadczeń autorów.
Some possibilities of using the advanced control methods in the DCS systems are discussed. problems of approximating the mapping and analysis of clusters used in modelling industrial processes are formulated. Modelling tools classified as artificial neural networks and systems with fuzzy ligic are presented. Some selected methods of using the neutral and fuzzy techniques in modelling, monitoring and control, taken from the autorás engineering practice, are given.
Źródło:: Pomiary Automatyka Kontrola; 1998, R. 44, nr 6, 6; 195-202
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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