Search results for " dynamic systems"
showing 9 items of 9 documents
Stochastic linearization critically re-examined
1997
Abstract The stochastic linearization technique, widely used for the analysis of nonlinear dynamic systems subjected to random excitations, is revisited. It is shown that the standard procedure universally adopted for determining the so-called effective stiffness of the equivalent linear system is erroneous in all previous publications. Two error-free stochastic linearization techniques are elucidated, namely those based on (1) the force linearization and (2) energy linearization.
Moving toward a Supetheory for All Seasons : Dialectical Dynamic Systems Theory and Sociocultural Theory - A Reply to McCafferty (2016)
2016
Moving toward a Supertheory for All Seasons: Dialectical Dynamic Systems Theory and Sociocultural Theory – A Reply to McCafferty (2016)
Valuing Variability: Dynamic Usage-based Principles in the L2 Development of Four Finnish Language Learners
2020
The general aim of this study is to trace the second language (L2) development of four beginner learners of Finnish over one academic year from a dynamic usage-based perspective. Contrary to many previous studies, this study starts out from meanings, not forms. In other words, an onomasiological approach is adopted. The aim is to investigate what kind of constructions the learners use to express 1) evaluation and 2) existentiality. In line with a dynamic usage-based approach, the goal is to investigate three aspects of development: 1) the interaction between different linguistic means used to express a certain meaning and between the instruction and learning trajectories, 2) variability pat…
Variaatio oppimisen osoittajana ja ohjaajana
2021
Arvioitu teos:
 Sirkku Lesonen: Valuing variability. Dynamic usage-based principles in the L2 development of four Finnish language learners. Groningen Dissertations in Linguistics 184. Groningen: Rijksuniversiteit Groningen 2020. 310 s. isbn 9789403426747. Saatavilla verkossa osoitteessa http://urn.fi/URN:ISBN:978-94-034-2675-4.
How to control stock markets
1994
This paper provides a different approach to the analysis of imperfect stock markets. The model we are concerned with is described by the interaction of three institutional classes of agents (the specialist trader, the professional trader and the non-professional trader), sharing different information. The dynamical discrete-time system obtained can be changed into a second-order linear difference equation forced by the fundamental value of the specialist trader. Using typical tools of control theory, we study the behaviour of the professional trader’s fundamental value influenced by the specialist’s one. © 1994 Taylor & Francis Group, LLC.
Measuring something that cannot be grasped – Reflections about Methodology in Elicitation of Spoken Competence
2014
The focus of this article is on reflections about methodology and the methodical choices in empirical research into the role of consciousness in the acquisition of spoken competence in German as second or third foreign language. Seeing language as a complex, dynamic system, I want to show how learning fluctuates. I would like to demonstrate that there is a continuous fluctuation between nonlinearity and stability which depends on particular driving forces. These forces have to be captured by methods whose aim is to increase the certainty of data. These reflections were proved by a case that wants to demonstrate how a multi-methodical approach works in this direction.
Convergence Analysis of Distributed Set-Valued Information Systems
2016
This paper focuses on the convergence of information in distributed systems of agents communicating over a network. The information on which the convergence is sought is not rep- resented by real numbers, as often in the literature, rather by sets. The dynamics of the evolution of information across the net- work is accordingly described by set-valued iterative maps. While the study of convergence of set-valued iterative maps is highly complex in general, this paper focuses on Boolean maps, which are comprised of arbitrary combinations of unions, intersections, and complements of sets. For these important class of systems, we provide tools to study both global and local convergence. A distr…
Variation and variability in L2 learning trajectories : Learning the Finnish existential construction
2022
Taking an onomasiological approach and a dynamic usage-based perspective, this study explores how four beginning L2 learners of Finnish develop in expressing existentiality (‘there is something somewhere’) before and after instruction. Data were collected weekly over a period of nine months and examined for conventionalized and non-conventionalized constructions that express existentiality. As expected from a dynamic usage-based perspective, both inter-individual variation and intra-individual variability were identified. The initial repertoires of two of the learners were quite variable, as they used several different non-conventionalized constructions before settling on more conventionali…
Multimode Representation of the Magnetic Field for the Analysis of the Nonlinear Behavior of Solar Activity as a Driver of Space Weather
2022
ISSP UL as the Center of Excellence is supported through the Framework Program for European universities Union Horizon 2020, H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under Grant Agreement No. 739508, CAMART2 project; Internal Foundation of University of Maryland.