Sökning: "discrete time model"

Visar resultat 36 - 40 av 322 avhandlingar innehållade orden discrete time model.

1. 36. Robust Sound Field Control for Audio Reproduction : A Polynomial Approach to Discrete-Time Acoustic Modeling and Filter Design

   Författare :Lars-Johan Brännmark; Anders Ahlén; Mikael Sternad; Mathias Johansson; Rodney Kennedy; Uppsala universitet; []
   Nyckelord :Acoustic signal processing; equalizers; error modeling; feedforward control; interpolation; loudspeakers; multivariable filters; polynomials; robustness; sound fields;

   Sammanfattning : This thesis is concerned with the design and analysis of robust discrete-time filters for audio equalization and sound field control in real reverberant environments. Inspired by methods in polynomial control theory, a unified framework for acoustic modeling and filter design is developed. LÄS MER

3. 37. Essays on Unit-Root Testing and on Discrete-Response Modelling of Firm Mergers

   Författare :Nikolay Angelov; Per Johansson; Steinar Strøm; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; unit root; structural break; LR test; stationary alternative; matching; firm mergers; discrete choice; Nationalekonomi; Economics; Nationalekonomi; nationalekonomi; Economics;

   Sammanfattning : Essay 1 investigates the time-series properties of the price of iron ore. The focus is on unit-root testing in the presence of a structural break. Unit-root tests with or without structural breaks are applied to historical prices of five different qualities of Swedish and Brazilian iron ore. Tests with exogenous or endogenous breaks are analyzed. LÄS MER

4. 38. Symbolic Supervisory Control of Timed Discrete Event Systems

   Författare :Sajed Miremadi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Supervisory Control Theory; Timed Discrete Event Systems; Extended Finite Automata; Binary Decision Diagrams.;

   Sammanfattning : With the increasing complexity of computer systems, it is crucial to have efficient design of correct and well-functioning hardware and software systems. To this end, it is often desired to control the behavior of systems to possess some desired properties. A specific class of systems is called discrete event systems (DES). LÄS MER

5. 39. Automation of Computational Mathematical Modeling

   Författare :Anders Logg; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; computational mathematical modeling; automation; adaptivity; multi-adaptivity; individual time steps; dual problem; a priori; a posteriori; model reduction; individual time steps;

   Sammanfattning : This thesis concerns the Automation of Computational Mathematical Modeling (CMM), involving the key steps of automation of (i) discretization, (ii) discrete solution, (iii) error control, (iv) modeling, and (v) optimization. The automation of (i)--(ii) is realized through multi-adaptive Galerkin methods on general discretizations of space-time with time steps variable in space. LÄS MER

7. 40. Discrete Event Process Modeling of Manufacturing Systems Using Sensor Graphs

   Författare :Tord Alenljung; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; State Estimation; Fault Detection and Diagnosis; Process Modeling; Discrete Event Systems; Logic Controllers; Formal Verification; State Feedback Control;

   Sammanfattning : The design of control programs for manufacturing systemsis becoming more and more complex as the demands for flexibility,efficiency and reconfigurability increase, due tochanging consumer demands and fierce competition.There are methods stemming from academia that can assist the control programmersin facing these challenges. LÄS MER