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Wyświetlanie 1-15 z 385
Tytuł:
Evolutionary radiation of the cheek teeth of Cretaceous placentals
Radiacja ewolucyjna zębów policzkowych u kredowych ssaków łożyskowych
Ehvoljucionnaja radiacija korennykh zubov melovykh placentalijj
Autorzy:
Butler, P.M.
Powiązania:
https://bibliotekanauki.pl/articles/23361.pdf
Data publikacji:
1977
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
evolutionary radiation
cheek tooth
tooth
Cretaceous
placental mammal
mammal
phylogenetic analysis
Źródło:
Acta Palaeontologica Polonica; 1977, 22, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genus Ammonicrinus (Crinoidea) from the Middle Devonian of the Holy Cross Mts (Poland)
Rodzaj Ammonicrinus (Crinoidea) ze środkowego dewonu Gór Świętokrzyskich (Polska)
Rod Ammonicrinus (Crinoidea) srednego devona Sventokrzhiskikh Gor (Pol’sha)
Autorzy:
Piotrowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/22051.pdf
Data publikacji:
1977
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Ammonicrinus
Ammonicrinus sulcatus
Ammonicrinus kongieli
evolutionary process
Crinoidea
crinoid
Middle Devonian
Devonian
paleontology
Holy Cross Mountains
Polska
Źródło:
Acta Palaeontologica Polonica; 1977, 22, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arguments of evolutionary ethics
Autorzy:
Nitecki, M H
Powiązania:
https://bibliotekanauki.pl/articles/20759.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
rapprochement
naturalistic fallacy
natural selection
philosophical fallacy
sociobiology
biological war
biological fallacy
evolutionary ethics
Źródło:
Acta Palaeontologica Polonica; 1993, 38, 3-4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early introduction of major morphological innovations
Autorzy:
Erwin, D H
Powiązania:
https://bibliotekanauki.pl/articles/20041.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
innovation
paleobiology
genetic mechanism
metazoan radiation
genetic hypothesis
evolutionary radiation
evolution
evolutionary theory
Cambrian
Opis:
The origin of major morphological innovations poses a major problem for macroevolutionary biologists. Such innovations appear to be overwhelmingly concentrated early in the history of major clades; subsequent evolution involves elaboration and variation on these early themes. Although confirmation of this pattern requires morphometric techniques only now being developed, it seems too firmly established to be an illusion. A variety of explanations have been advanced for the extensive morphologic innovation during the Cambrian radiation, including the ecospace hypothesis which relies on more extensive ecospace, and a variety of genomic hypotheses ranging from a more rapid rate of real or apparent mutation, to novel types of genetic change, or novel effects within a more plastic developmental system. Recently some theorists have suggested the inherent properties of complex dynamic systems are a sufficient explanation. However, most discussions have emphasized the ecosystem and genomic hypotheses. These have proven difficult to disentangle because no unique predictions about expected patterns have been proposed, but I suggest here phylogenetic tests which do discriminate between these possibilities. There is a curious distinction between the empty ecospace hypothesis and one variant of the developmental hypothesis: Under the former, extensive morphologic innovation should be possible whenever extensive ecospace becomes available. The constraints on innovation are atemporal and extrinsic. In contrast, under the second scenario the formation of developmental systems itself constrains further innovation. Thus the concentration of innovation early in the history of clades may stem from irreversible changes associated with the origin, rather than subsequent modification, of development.
Źródło:
Acta Palaeontologica Polonica; 1993, 38, 3-4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Populations, ecosystems and global diversity: the scientific work of Antoni Hoffman
Autorzy:
Reif, W.E.
Powiązania:
https://bibliotekanauki.pl/articles/23459.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
biography
evolutionary work
Hoffman A.bibliography
geology
global diversity
evolution
ecosystem
oceanic geochemistry
population
paleoecological work
Hoffman Antoni biography
Źródło:
Acta Palaeontologica Polonica; 1993, 38, 3-4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fundamentals of scatter search and path relinking
Autorzy:
Glover, F.
Laguna, M.
Marti, R.
Powiązania:
https://bibliotekanauki.pl/articles/205907.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optymalizacja
evolutionary methods
metaheuristics
optimization
tabu search
Opis:
The evolutionary approach called Scatter Search, and its generalized form called Path Relinking, have proved unusually effective for solving a diverse array of optimization problems from both classical and real world settings. Scatter Search and Path Relinking differ from other evolutionary procedures, such as genetic algorithms, by providing unifying principles for joining solutions based on generalized path constructions (in both Euclidean and neighborhood spaces) and by utilizing strategic designs where other approaches resort to randomization. Scatter Search and Path Relinking are also intimately related to the Tabu Search metaheuristic, and derive additional advantages by making use of adaptive memory and associated memory-exploiting mechanisms that are capable of being adapted to particular contexts. We describe the features of Scatter Search and Path Relinking that set them apart from other evolutionary approaches, and that offer opportunities for creating increasingly more versatile and effective methods in the future.
Źródło:
Control and Cybernetics; 2000, 29, 3; 653-684
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary algorithm for learning Bayesian structures from data
Autorzy:
Kozłowski, M.
Wierzchoń, S. T.
Powiązania:
https://bibliotekanauki.pl/articles/1986916.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
Bayesian networks
structure learning
evolutionary algorithm
discrete optimization
Opis:
In this paper we report an evolutionary approach to learning Bayesian networks from data. We explain reasons, which advocate such a non-deterministic approach. We analyze weaknesses of previous works and come to conclusion that we should operate in the search space native for the problem i.e. in the space of directed acyclic graphs instead of standard space of binary strings. This requires adaptation of evolutionary methodology into very specific needs. We propose quite new data representation and implementation of generalized genetic operators and then we present an efficient algorithm capable of learning complex networks without additional assumptions. We discuss results obtained with this algorithm. The approach presented in this paper can be extended with the possibility to absorb some suggestions from experts or obtained by means of data preprocessing.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 3; 509-521
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary neural-networks based optimisation for short-term load forecasting
Autorzy:
Grzenda, M.
Macukow, B.
Powiązania:
https://bibliotekanauki.pl/articles/206850.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optymalizacja
programowanie ewolucyjne
sieć neuronowa
evolutionary programming
neural networks
optimisation
Opis:
The purpose of short-term load forecasting is to optimise the power supply volume in short time horizon. There is no straightforward mapping rule between the type of time period and the resulting power consumption. Still, it is inevitable for the overall efficiency of the power system to rely on a good prediction model. Our paper illustrates a novel approach based on evolutionary programming. Feedforward networks are being evolved by the ECoMLP method in order to properly solve the optimisation problem, defined as minimisation of the prediction error. All the results have been obtained using the data from the Polish Power System. The data used for the training and tests has been chosen so as to reflect both short-time and long-time dependencies between time period category and load of the system. The primary feature of the described method is a novel self-adaptive procedure that is a part of a sophisticated design algorithm serving to select both network architecture and weight connections. Due to the application of this procedure, no time consuming tests are required to train and retrain neural prediction models. Therefore, the method makes it possible to construct and maintain prediction models for load forecasting without expert knowledge about neural networks.
Źródło:
Control and Cybernetics; 2002, 31, 2; 371-382
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Learning decision rules using a distributed evolutionary algorithm
Autorzy:
Kwedlo, W.
Krętowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1986918.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
decision rule learning
distributed evolutionary algorithms
Opis:
A new parallel method for learning decision rules from databases by using an evolutionary algorithm is proposed. We describe an implementation of EDRL-MD system in the cluster of multiprocessor machines connected by Fast Ethernet. Our approach consists in a distribution of the learning set into processors of the cluster. The evolutionary algorithm uses a master-slave model to compute the fitness function in parallel. The remiander of evolutionary algorithm is executed in the master node. The experimental results show, that for large datasets our approach is able to obtain a significant speed-up in comparison to a single processor version.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 3; 483-492
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of multiple criteria evolutionary algorithms to vector optimisation, decision support and reference point approaches
Autorzy:
Szczepański, M.
Wierzbicki, A.P.
Powiązania:
https://bibliotekanauki.pl/articles/307706.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
algorytm ewolucyjny
optymalizacja wektorowa
evolutionary algorithm
vector optimisation
nadir point estimation
reference point techniques
Opis:
Multiple criteria evolutionary algorithms, being essentially parallel in their character, are a natural instrument of finding a representation of entire Pareto set (set of solutions and outcomes non-dominated in criteria space) for vector optimisation problems. However, it is well known that Pareto sets for problems with more than two criteria might become complicated and their representation very time-consuming. Thus, the application of such algorithms is essentially limited to bi-criteria problems or to vector optimisation problems with more criteria but of simple structure. Even in such cases, there are problems related to various important aspects of vector optimisation, such as the uniformity of representation of Pareto set, stopping tests or the accuracy of representing Pareto set, that are not fully covered by the broad literature on evolutionary algorithms in vector optimisation. These problems and related computational tests and experience are discussed in the paper. In order to apply evolutionary algorithms for decision support, it would be helpful to use them in an interactive mode. However, evolutionary algorithms are in their essence global and of batch type. Nevertheless, it is possible to introduce interactive aspects to evolutionary algorithms by focusing them on a part of Pareto set. The results of experimental tests of such modifications of evolutionary algorithms for vector optimisation are presented in the paper. Another issue related to vector optimisation problems with more than two criteria is the computational difficulty of estimating nadir points of Pareto set. The paper describes the use of diverse variants of evolutionary algorithms to the estimation of nadir points, together with experimental evidence.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 3; 16-33
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary algorithms and boundary element method in generalized shape optimization
Algorytmy ewolucyjne i metoda elementów brzegowych w uogólnionej optymalizacji kształtu
Autorzy:
Burczyński, T.
Kokot, G.
Powiązania:
https://bibliotekanauki.pl/articles/279253.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
evolutionary algorithms
genetic algorithms
generalized shape optimization
topology optimization
Opis:
The coupling of modern, alternative optimization methods such as evolutionary algorithms with the effective tool for analysis of mechanical structures - BEM, gives a new optimization method, which allows one to perform the generalized shape optimization (simultaneous shape and topology optimization) for elastic mechanical structures. This new evolutionary method is free from typical limitations connected with classical optimization methods. In the paper, results of researches on the application of evolutionary methods in the domain of mechanics are presented. Numerical examples for some optimization problems are presented, too.
Połączenie nowoczesnych algorytmów optymalizacji, jakimi są algorytmy ewolucyjne, z metodą elementów brzegowych pozwala opracować alternatywną metodę optymalizacji sprężystych układów mechanicznych w zakresie uogólnionej optymalizacji kształtu (połaczenie optymalizacji kształtu z optymalizacją topologiczną). Metoda ta jest pozbawiona wad związanych z typowymi klasycznymi metodami optymalizacji (ciągłość funkcji celu, wyznaczanie gradientu funkcji itp.), co znacznie rozszerza możliwości jej zastosowań. W artykule przedstawiono proponowaną metodę optymalizacji wraz z przykładami optymalizacji wybranych układów mechanicznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2003, 41, 2; 341-364
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interfacing war game simulations with tactical C2 systems - dream or reality?
Autorzy:
Šnajder, M.
Holden, P.W.
Powiązania:
https://bibliotekanauki.pl/articles/309339.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
C2 systems
war fighting simulation
GF-TCCS
NCOE
system architecture
constructive simulations ModSAF
SAF
SIMNET CGFs
OTB
DIS
HLA
evolutionary system development
rapid prototyping
interfacing ModSAF with GF-TCCs
MOD
friendly and enemy forces
tactical operations centre
Opis:
Decision making process in current tactical C2 systems is base on planning process of commanders and their staff. Improving tactical decision making by interfacing war game simulations with tactical C2 systems is achievable. Commander can review the results of the simulation and subsequently modify the tactical plan. Previously, the use of "training" simulations was not a viable solution to real world decision making due to the lengthy time required to input all of the combat entities, the unit organizations and personnel dispositions, the equipment configurations, status of the units and equipment, and the distribution of the available supplies. Modern C2 systems have all of this information stored in the common system databases, and this information can be used to instantiate and populate the simulation through an electronic adaptation of the data structures to match the requirements of the constructive simulation. This paper will provide description of system approach of interfacing simulation and C2 system to improve decision-making.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 4; 57-65
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Profile-based architecture of evolutionary MAS
Autorzy:
Kisiel-Dorohinicki, M.
Dobrowolski, G.
Nawarecki, E.
Powiązania:
https://bibliotekanauki.pl/articles/1931571.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
decentralized artificial intelligence
multi-agent systems
evolutionary computation
Opis:
A sub-type of multi-agent systems (MAS) called evolutionary ones (EMAS), special in its features and field of application, needs a dedicated architecture that would be more adequate and easier in design and implementation. The proposed architecture uses the notion of a profile which models strategies and goals of an agent with respect to an aspect of its operation. To make a decision, an agent is equipped with an algorithm that coordinates premises determined in its profiles. The paper presents main ideas of the architecture illustrated with an actual realisation of an EMAS solving the multi-objective optimisation problem.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 1; 65-72
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorytmy ewolucyjne w identyfikacji odwrotnych modeli diagnostycznych
Evolutionary algorithms in identification of inverse diagnostics models
Autorzy:
Urbanek, G.
Powiązania:
https://bibliotekanauki.pl/articles/327414.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
modele odwrotne
algorytmy ewolucyjne
przybliżony symulator
inverse models
evolutionary algorithms
rough simulator
Opis:
Jedną z metod identyfikacji modeli odwrotnych jest wyznaczanie ich na podstawie przykładów opisujących zadane stany rozpatrywanego obiektu oraz odpowiadające tym stanom symptomy. Stosowanie tej metody wymaga posiadania odpowiedniego zbioru takich przykładów, których jakość decyduje o jakości tak wyznaczanego modelu odwrotnego. W artykule opisano zastosowanie algorytmu ewolucyjnego do optymalizacji zbioru przykładów. Przedstawiono wyniki obliczeń, wskazano możliwości ograniczania czasu obliczeń.
One of identification methods of inverse models is based on examples described determined states of examined object and symptoms corresponded to these states. Application of this method requires a proper set of such examples, the quality of which influence on quality of evaluated inverse model. The application of evolutionary algorithms for searching optimal set of examples is described in the paper. The results of the research and possibilities of reducing computation time are shown.
Źródło:
Diagnostyka; 2004, 30, T. 2; 161-164
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 385

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