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Tytuł:
Survey of NGN migration profiles deployed by selected carriers in Europe, North America and Asia
Autorzy:
Michalski, W.
Powiązania:
https://bibliotekanauki.pl/articles/308118.pdf
Data publikacji:
2008
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
NGN
IMS
softswitch based solution
NGN migration strategies
network evolution
Opis:
The paper presents the alternative migration profiles to next generation carrier network architecture. It describes the paths of development of fixed public network in- frastructure for five selected service providers. The carriers are selected as being in advanced stage of migration towards NGN. Moreover, examples of varying strategies ranging from full PSTN replacement and NGN overlay to constructing an NGN network from the ground up as well as examples of various migration strategies, especially based on IMS and softswitch solutions are presented.
Źródło:
Journal of Telecommunications and Information Technology; 2008, 3; 60-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examples of multiple criteria ranking in the design of cellular networks of mobile telecommunication
Autorzy:
Klimasara, E.
Wierzbicki, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/305642.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
design of cellular networks
network evolution
variants of network designs
multiple criteria ranking of network designs
objectified ranking
Opis:
The paper addresses planning and design of contemporary networks of mobile telecommunication, where an existing network is subject to far reaching development and modication, thus evolution with diverse requirements of users and diverse density of network cells. This leads to considering diverse variants of network designs. When several variants of network designs are available, an investor might ask for a ranking of these variants. The investor is obviously not bounded by the results of such a ranking and might select a variant not highest in the ranking, but an objectied ranking might help in the selection. Therefore, the paper presents the way of computing and examples of objectied multiple criteria ranking, possibly not requiring the determination of weighting coecients.
Źródło:
Computer Science; 2018, 19 (1); 99-112
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regional geographies of land transport networks in the Pearl River Delta mega-region, China: A longitudinal analysis
Autorzy:
Gao, X.
Li, T.
Powiązania:
https://bibliotekanauki.pl/articles/2140889.pdf
Data publikacji:
2018
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
transport network
network efficiency
spatiotemporal evolution
Pearl River Delta
PRD
Opis:
This paper uses network-based efficiency measures to evaluate the efficiency implications of the evolution of the transport network in the Pearl River Delta (PRD) over the period 1988-2008. The network-based efficiency measures consider the relative ease of access between cities in terms of weighted relative travel cost. The results indicate that the spatial patterns of network efficiency are different from ‘core-periphery’ pattern derived from classical accessibility indicators. This implies that there are low network efficiency cities and high network efficiency cities in core and peripheral regions at the same time. In the first stage (1988-1998), the efficiency contour shows a ‘corridor’ pattern along the GuangShen traffic corridor between Guangzhou and Shenzhen in the eastern side of the Pearl estuary; in the following decade (1998-2008), with large-scale infrastructural developments, the spatial pattern has changed from a north-south corridor to an east-west contiguous distribution pattern. By 2008, the mean network efficiency value indicates that the efficiency levels within the PRD as a whole are tending towards optimal levels. We conclude by suggesting ways to promote the urban economic development based on the relationship between the network efficiency and per capita GDP.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2018, 3, 1; 37-52
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Brain, mind and modern human identity – dilemmas and solutions
Autorzy:
Błaszak, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/703008.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
predictive mind
bayesian brain
salience network
central executive network
default mode network
human cognitive evolution
Opis:
Human brain is “the perfect guessing machine” (James V. Stone (2012) Vision and Brain, Cambridge, Mass: The MIT Press, p. 155), trying to interpret sensory data in the light of previous biases or beliefs. Bayesian inference is carried out by three complex networks of the human brain: salience network, central executive network, and default mode network. Their function is analysed both in neurotypical person and Attention Deficit Disorder. Modern human being having predictive brain and overloaded mind must develop social identity, whose evolution went probably through three stages: social selection based on punishment, sexual selection based on reputation, and group selection based on identity.
Źródło:
Nauka; 2017, 1
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowa gospodarka ery informacji
The New Economy of the Information Age
Autorzy:
Baraniewicz, Sabina
Powiązania:
https://bibliotekanauki.pl/articles/462375.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Opolski
Tematy:
komercjalizacja sieci
gospodarka sieci
era informacji
ewolucja kapitalizmu
network commercialization
network economy
era of information
capitalism evolution
Opis:
Rewolucyjny rozwój internetu znacząco wpłynął nie tylko na społeczeństwo i kulturę, ale także na gospodarkę. Największe sieciowe korporacje nie pozostały bierne wobec pojawiających się zmian i zaczęły doskonale wykorzystywać ludzkie przywiązanie do sieci. Komercyjny pęd doprowadził wręcz do uprzedmiotowienia człowieka i mierzenia jego wartości w kategoriach ekonomicznych. Kapitalizm odbił swe piętno na funkcjonowaniu sieci, ale sieć, rządząca się swoimi prawami, także zaczęła wpływać na formę tego systemu i ją uaktualniać. Staliśmy się świadkami ewolucji kapitalistycznego rynku i dezaktualizacji niektórych pojęć.
Revolutionary development of the internet has significantly affected not only society and culture, but also economy. The biggest network corporations has not been passive in the face of upcoming changes and began perfectly to use people attachment to the network. The commercial urge has led to the objectification of man and the measuring of his or her value in the economic terms. Capitalism has exacted its toll on the nets functioning, but the network, ruled by its own rules, has also began to influence on the form of that system and to actualize it. We have became the witnesses of the capitalist market evolution and the obsolescence of some concepts.
Źródło:
Studia Krytyczne/ Critical Studies; 2016, 3; 87-100
2450-9078
Pojawia się w:
Studia Krytyczne/ Critical Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An enhanced differential evolution algorithmwith adaptive weight bounds for efficient training ofneural networks
Ulepszony algorytm ewolucji różnicowej z adaptacyjnymi granicami wag dla efektywnego szkolenia sieci neuronowych
Autorzy:
Limtrakul, Saithip
Wetweerapong, Jeerayut
Powiązania:
https://bibliotekanauki.pl/articles/27315365.pdf
Data publikacji:
2023
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
neural network
differential evolution
training neural network
function approximation
sieć neuronowa
ewolucja różnicowa
trening sieci neuronowej
aproksymacja funkcji
Opis:
Artificial neural networks are essential intelligent tools for various learning tasks. Training them is challenging due to the nature of the data set, many training weights, and their dependency, which gives rise to a complicated high-dimensional error function for minimization. Thus, global optimization methods have become an alternative approach. Many variants of differential evolution (DE) have been applied as training methods to approximate the weights of a neural network. However, empirical studies show that they suffer from generally fixed weight bounds. In this research, we propose an enhanced differential evolution algorithm with adaptive weight bound adjustment (DEAW) for the efficient training of neural networks. The DEAW algorithm uses small initial weight bounds and adaptive adjustment in the mutation process. It gradually extends the bounds when a component of a mutant vector reaches its limits. We also experiment with using several scales of an activation function with the DEAW algorithm. Then, we apply the proposed method with its suitable setting to solve function approximation problems. DEAW can achieve satisfactory results compared to exact solutions.
Sztuczne sieci neuronowe są niezbędnymi inteligentnymi narzędziami do realizacji różnych zadań uczenia się. Ich szkolenie stanowi wyzwanie ze względu na charakter zbioru danych, wiele wag treningowych i ich zależności, co powoduje powstanie skomplikowanej, wielowymiarowej funkcji błędu do minimalizacji. Dlatego alternatywnym podejściem stały się metody optymalizacji globalnej. Wiele wariantów ewolucji różnicowej (DE) zostało zastosowanych jako metody treningowe do aproksymacji wag sieci neuronowej. Jednak badania empiryczne pokazują, że cierpią one z powodu ogólnie ustalonych granic wag. W tym badaniu proponujemy ulepszony algorytm ewolucji różnicowej z adaptacyjnym dopasowaniem granic wag (DEAW) dla efektywnego szkolenia sieci neuronowych. Algorytm DEAW wykorzystuje małe początkowe granice wag i adaptacyjne dostosowanie w procesie mutacji. Stopniowo rozszerza on granice, gdy składowa wektora mutacji osiąga swoje granice. Eksperymentujemy również z wykorzystaniem kilku skal funkcji aktywacji z algorytmem DEAW. Następnie, stosujemy proponowaną metodę z jej odpowiednim ustawieniem do rozwiązywania problemów aproksymacji funkcji. DEAW może osiągnąć zadowalające rezultaty w porównaniu z rozwiązaniami dokładnymi.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2023, 13, 1; 4--13
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations
Autorzy:
Backfrieder, C.
Ostermayer, G.
Powiązania:
https://bibliotekanauki.pl/articles/226992.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mobile network simulation
system levels
long term evolution
time division duplex
variable switching point
Opis:
This paper introduces an LTE system level simulator and presents investigations of scenarios with differently balanced traffic emergence between uplink and downlink as well as inhomogeneous distribution of link direction asymmetry. In the TDD mode of LTE, duplexing is implemented via sharing the time domain between uplink and downlink users. This is done by different switching configurations, which offer varying capacity distributions between downlink and uplink, from a downlink-heavy configuration with 90 percent of the capacity in downlink direction to uplink heavy configurations with 60 percent uplink. We utilize the available capacity perfectly by adjusting the link configuration appropriately to traffic emergence. Performance gains when selecting a configuration appropriate to the arising traffic compared to usage of a static configuration with equally distributed capacity are investigated. In case of different configurations, additional interference can occur in neighbored cells due to distinct communication direction at the same time. We clarify the differences between these scenarios and quantify the gains and losses when the switching point between uplink and downlink is variable.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 171-178
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ranking of LTE cells based on key performance indicators using MCDM methods
Autorzy:
Lopes Neto, Pedro Nunes
Freire Junior, José Celso
Tuna, Celso Eduardo
Powiązania:
https://bibliotekanauki.pl/articles/2211970.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
long-term evolution
multiple criteria methods
radio access network performance management
self-organizing networks
Opis:
The growth in worldwide data traffic and user subscriptions in mobile telecommunication networks makes it increasingly difficult to manage network performance in an environment already containing multiple radio access technologies. Despite the rise of 5G, LTE remains the dominant technology, and new cells are installed daily to support traffic growth and new services such as voice over LTE. Detecting faulty cells in the network is one of the main concerns of operators. Self organizing networks have been introduced to deal with this problem, and their self healing functionality has improved cell fault management. Nonetheless, faulty cell detection remains challenging, and most of the tasks involved are still done manually. This paper introduces a new method of faulty cell detection in an LTE radio access network, applying multiple criteria methods to this problem. The cells are ranked based on selected key performance indicators, using the multi attribute utility theory to construct a utility function. The analytic hierarchy process is used to define weights for the criteria.
Źródło:
Multiple Criteria Decision Making; 2022, 17; 46-68
2084-1531
Pojawia się w:
Multiple Criteria Decision Making
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on riverbed evolution on the Nida river at the Pinczow and Wislica gauging station
Autorzy:
Lapuszek, M.
Powiązania:
https://bibliotekanauki.pl/articles/62286.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
riverbed
evolution
Nida River
river regulation
linear regression
river network
catchment
erosion
denudation
hydrology
fluvial system
long-term evolution
bottom
stream bed
Opis:
The long-term evolution of the river beds of Nida River in Pińczów and Wiślica gauging station as well as an analysis of the causes of significant cases of lowering of the bottom of stream beds are presented in the paper. The intensity of river bed evolution as a stochastic process is described with the use of a statistical model. The analysis of the intensity of the process of river bed erosion was conducted under the assumption that the observed long-term trend of the lowest annual water levels reflect the elevation of the river bottom in the same years. The recorded observations at the Pińczów and Wiślica gauging stations on the Nida River, covering over 70-year period of time, are analyzed. Observations of the variability in the studied bottom levels over the decades allow concluding that the great transformation of riverbeds occurred there. The observations and calculations show that in Pińczów multistream or meandering river bed changed into straight channel and the process of shallowing of the river bed appeared. At the Wiślica gauging station the process of riverbed erosion with the variable intensity was observed. The research shows that the causes of these changes observed in Pińczów and Wiślica are not natural, but rather of human activity.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2011, 12
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural/sexual selection: What’s language (evolution) got to do with it?
Autorzy:
Progovac, Ljiljana
Powiązania:
https://bibliotekanauki.pl/articles/1120961.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
evolution of grammar/syntax
(sexual) selection
decomposition of transitivity
bro-ca’s-basal ganglia network
(verbal) aggression
Opis:
By considering a specific scenario of early language evolution, here I advocate taking into account one of the most obvious players in the evolution of human language capacity: (sexual) selection. The proposal is based both on an internal reconstruction using syntactic theory, and on comparative typological evidence, directly bringing together, formal, typological, and evolutionary considerations. As one possible test case, transitivity is decomposed into evolutionary primitives of syntactic structure, revealing a common denominator and the building blocks for crosslinguistic variation in transitivity. The approximations of this early grammar, identified by such a reconstruction, while not identical constructs, are at least as good proxies of the earliest stages of grammar as one can find among tools, cave paintings, or bird song. One subtype of such “living fossils” interacts directly with biological considerations of survival, aggression, and mate choice, while others clearly distinguish themselves in fMRI experiments. The fMRI findings are consistent with the proposal that the pressures to be able to master ever more and more complex syntax were at least partly responsible for driving the selection processes which gradually increased the connectivity of the Broca’s-basal ganglia network, crucial for syntactic processing, among other important functions.
Źródło:
Yearbook of the Poznań Linguistic Meeting; 2019, 5, 1; 35-58
2449-7525
Pojawia się w:
Yearbook of the Poznań Linguistic Meeting
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 13

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