Search results for "VDP::Mathematics and natural science: 400"
showing 10 items of 421 documents
Accelerated Bayesian learning for decentralized two-armed bandit based decision making with applications to the Goore Game
2012
Published version of an article in the journal: Applied Intelligence. Also available from the publisher at: http://dx.doi.org/10.1007/s10489-012-0346-z The two-armed bandit problem is a classical optimization problem where a decision maker sequentially pulls one of two arms attached to a gambling machine, with each pull resulting in a random reward. The reward distributions are unknown, and thus, one must balance between exploiting existing knowledge about the arms, and obtaining new information. Bandit problems are particularly fascinating because a large class of real world problems, including routing, Quality of Service (QoS) control, game playing, and resource allocation, can be solved …
Robust synchronization and fault detection of uncertain master-slave systems with mixed time-varying delays and nonlinear perturbations
2011
Publiahed version of an article in the journal: International Journal of Control, Automation and Systems. Also available from the publisher on SpringerLink: http://dx.doi.org/10.1007/s12555-011-0408-8 In this paper, the problem of robust synchronization and fault detection for a class of master-slave systems subjected to some nonlinear perturbations and mixed neutral and discrete time-varying delays is investigated based on an H ∞ performance condition. By introducing a descriptor technique, using Lyapunov-Krasovskii functional and a suitable change of variables, new required sufficient conditions are established in terms of delay-dependent linear matrix inequalities to synthesize the resid…
A sliding mode approach to H∞ synchronization of master–slave time-delay systems with Markovian jumping parameters and nonlinear uncertainties
2012
Author's version of an article published in the journal: Journal of the Franklin Institute. Also available from the publisher at: http://dx.doi.org/10.1016/j.jfranklin.2011.09.015 In this paper, a sliding-mode approach is proposed for exponential H∞ synchronization problem of a class of masterslave time-delay systems with both discrete and distributed time-delays, norm-bounded nonlinear uncertainties and Markovian switching parameters. Using an appropriate LyapunovKrasovskii functional, some delay-dependent sufficient conditions and a synchronization law, which include the masterslave parameters are established for designing a delay-dependent mode-dependent sliding mode exponential H∞ synch…
Using computer technology in teaching and learning mathematics in an Albanian upper secondary school : the implementation of Simreal in trigonometry …
2012
Masteroppgave i matematikkdidaktikk- Universitetet i Agder, 2012 This study presents an investigation on the use of computer technology in mathematics teaching and learning, focusing on the students’ mathematical understanding, their attitudes and opinions in relation to such experience. It provides empirical evidence for the use of the program called SimReal in supporting exploratory and learning related activities of one important part of mathematics, trigonometry. The participants in this study were students from the second grade of an Albanian private upper secondary school (16 – 17 years old students). This is a new experience in Albanian education. The use of technology and computer p…
Elever og læreboken : en casestudie om læreboken sin rolle hos matematikkelever
2011
Masteroppgave i matematikkdidaktikk- Universitetet i Agder 2011 Students and the textbook is a case study of the role of the textbook among students. When a textbook is used in lessons, it is likely that a relation between the text and pupils will develop. Then, it is reasonable to assume that the students are influenced by the textbook in one way or the other. This study sets out to illustrate any relation that might exist between students understanding and the way in which they use the textbook. I have attempted to identify what is characteristic of each student’s understanding, although realizing the impossibility to determine anyone’s perception with certainty. To classify the students …
Procedural and conceptual knowledge among upper secondarystudents : the case of second degree polynomials
2010
Masteroppgave i matematikkdidaktikk- Universitetet i Agder 2010 This study is concerned with conceptual and procedural knowledge of second degree polynomials. I try to give an account of a group of students’ knowledge of this topic The research questions I pose are the following: - How fluent are the students with respect to the algorithms for problem solving where quadratic polynomials are involved? - Can one find indications that the students possess any conceptual knowledge of the subject? I provide an overview of the relevant literature, with a focus on how these knowledge types relate to each other, how they influence one another, which instructional strategies are suited to instill th…
Utvikling av inquirybasert matematikkundervisning : en kasusstudie av læreres tolkning og bruk av en inquiryinspirert læringsfilosofi formidlet gjenn…
2012
Masteroppgave i matematikkdidaktikk- Universitetet i Agder, 2012 The development project LBM – Learning Better Mathematics – took place in schools and kindergartens in Vest-Agder from 2007 to 2010. Two years after its end, I investigate the practice and the beliefs about learning and teaching of mathematics of four former participants, and I`m particularly interested in how these teachers interpret and implement an inquiry inspired learning philosophy. This means, instruction where the students are active and explore mathematics together, but it`s also about the teachers own professional development through exploration and community with others. The intention is not to evaluate the project …
Convective Roll Instabilities of Vertical Throughflow with Viscous Dissipation in a Horizontal Porous Layer
2009
Published version of an article from the journal: Transport in Porous Media. The original publication is available at Spingerlink. http://dx.doi.org/10.1007/s11242-009-9417-y The vertical throughflow with viscous dissipation in a horizontal porous layer is studied. The horizontal plane boundaries are assumed to be isothermal with unequal temperatures and bottom heating. A basic stationary solution of the governing equations with a uniform vertical velocity field (throughflow) is determined. The temperature field in the basic solution depends only on the vertical coordinate. Departures from the linear heat conduction profile are displayed by the temperature distribution due to the forced con…
Structural Vibration Control for a Class of Connected Multistructure Mechanical Systems
2012
Published version of an article from the journal: Mathematical Problems in Engineering. Also available from the publisher:http://dx.doi.org/10.1155/2012/942910 A mathematical model to compute the overall vibrational response of connected multistructure mechanical systems is presented. Using the proposed model, structural vibration control strategies for seismic protection of multibuilding systems can be efficiently designed. Particular attention is paid to the design of control configurations that combine passive interbuilding dampers with local feedback control systems implemented in the buildings. These hybrid active-passive control strategies possess the good properties of passive contro…
Discrete-time multioverlapping controller design for structural vibration control of tall buildings under seismic excitation
2012
Published version of an article from the journal: Mathematical Problems in Engineering. Also available from the publisher:http://dx.doi.org/10.1155/2012/636878 In this paper, a computationally effective strategy to obtain multioverlapping controllers via the Inclusion Principle is applied to design discrete-time state-feedback multioverlapping LQR con- trollers for seismic protection of tall buildings. To compute the corresponding control actions, the proposed semidecentralized controllers only require state information from neighboring stories. This particular configuration of information exchange allows introducing a dramatic reduction in the transmission range required for a wireless imp…