Decentralized model reference control of flexible cable-stayed beam structures

A decentralized model reference controller is designed to reduce the magnitude of the transversal vibration of a flexible cable-stayed beam structure induced by a seismic excitation. The controller design is made based on the principle of sliding mode such that a priori knowledge

Active control of structures with uncertain coupled subsystems and actuator dynamics

This paper deals with the problem of stabilizing a class of structures subject to an uncertain excitation due to the temporary coupling of the main system with another uncertain dynamical subsystem. A Lyapunov function based control scheme is proposed to attenuate the structural vibration. In the control design, the actuator dynamics is taken into account. The control scheme is implemented by using only feedback information of the main system. The effectiveness of the control scheme is shown for a bridge platform with crossing vehicle

Semiactive backstepping control for vibration attenuation in structures equipped with magnetorheological actuatorscat

This paper deals with the problem of semiactive vibration control of civil engineering structures subject to unknown external disturbances (for example, earthquakes, winds, etc.). Two kinds of semiactive controllers are proposed based on the backstepping control technique. The experimental setup used is a 6-story test structure equipped with shear-mode semiactive magnetorheological dampers being installed in the Washington University Structural Control and Earthquake Engineering Laboratory (WUSCEEL). The experimental results obtained have verified the effectiveness of the proposed control algorithms

A mixed H2/H∞-based semiactive control for vibration mitigation in flexible structures

In this paper, we address this problem through the design of a semiactive controller based on the mixed H2/H∞ control theory. The vibrations caused by the seismic motions are mitigated by a semiactive damper installed in the bottom of the structure. It is meant by semiactive damper, a device that absorbs but cannot inject energy into the system. Sufficient conditions for the design of a desired control are given in terms of linear matrix inequalities (LMIs). A controller that guarantees asymptotic stability and a mixed H2/H∞ performance is then developed. An algorithm is proposed to handle the semiactive nature of the actuator. The performance of the controller is experimentally evaluated in a real-time hybrid testing facility that consists of a physical specimen (a small-scale magnetorheological damper) and a numerical model (a large-scale three-story building)

QFT control for vibration reduction in structures equipped with MR dampers

This short paper addresses the problem of designing a QFT (quantitative feedback theory) based controllers for the vibration reduction in a 6-story building structure equipped with shear-mode magnetorheological dampers. A new methodology is proposed for characterizing the nonlinear hysteretic behavior of the MR damper through the uncertainty template in the Nichols chart. The design procedure for QFT control design is briefly presented

TU Graz: Course: 707.000 Web Science and Web Technology: Lecture 12: User Intentions and Intentional Structures on the Web II

In this lecture, we will focus on analyzing user goals in search query logs. Readings: M. Strohmaier, P. Prettenhofer, M. Lux, Different Degrees of Explicitness in Intentional Artifacts - Studying User Goals in a Large Search Query Log, CSKGOI'08 International Workshop on Commonsense Knowledge and Goal Oriented Interfaces, in conjunction with IUI'08, Canary Islands, Spain, 2008.

TU Graz: Course: 707.000 Web Science and Web Technology: Lecture 11: User Intentions and Intentional Structures on the Web

Search engines - such as Google - have been characterized as "Databases of intentions". This class will focus on different aspects of intentionality on the web, including goal mining, goal modeling and goal-oriented search. Readings: M. Strohmaier, M. Lux, M. Granitzer, P. Scheir, S. Liaskos, E. Yu, How Do Users Express Goals on the Web? - An Exploration of Intentional Structures in Web Search, We Know'07 International Workshop on Collaborative Knowledge Management for Web Information Systems in conjunction with WISE'07, Nancy, France, 2007. [Web link] Readings: Automatic identification of user goals in web search, U. Lee and Z. Liu and J. Cho WWW '05: Proceedings of the 14th International World Wide Web Conference 391--400 (2005) [Web link]

El análisis de las relaciones regionales de Sierra Leona en materia de seguridad bajo el marco de Mano River Union después de la guerra civil, 2002-2007

En 1973 se establece una asociación internacional entre Liberia y Sierra Leona llamada Mano River Union (MRU) con el objetivo de establecer una integración económica subregional, a la cual Guinea se integró en 1980. Tras el final de los conflictos civiles en la región, en el 2004 se lleva a cabo la Inauguración del Foro de Paz de Mano River Union, en el cual se establecieron nuevos parámetros para el funcionamiento del grupo subregional el cual está basado en identificar las amenazas comunes y actuar en conjunto frente a ellas. Dentro de las amenazas que tienen el potencial de debilitar la seguridad de la región y así mismo, debilitar las estructuras estatales, se establecen a los problemas de gobernanza, las amenazas fronterizas y los temas de refugiados como los más importantes a tratar.

Control Structures

These slides describe how control structures (if/else and loops) are used within algorithms. It includes a description of conditionals (>, ==, etc.) and logic (AND, OR, etc).

Networks 3: Social Structures

A brief look at the post-industrial, network society, freed from manual labour and liberated from place.

Clinical Governance Podcast

mainly read from a script

Clinical Governance podcast.

Interview with Anne Baileff by Trevor Kettle

Papel de la Organización de Naciones Unidas ONU (MINUGUA) en el proceso de reconstrucción posconflicto guatemalteco en materia de justicia transicional (1994-2004). Un estado del arte

Estado del arte que recopila pronunciamientos de diversos autores sobre el papel de la Organización de Naciones Unidas, específicamente la Misión MINUGUA, en el proceso de reconstrucción posconflicto en Guatemala comprendido entre el año 1994 y 2004. Se basa en algunas dimensiones de la democratización como son el Estado de Derecho, la democracia representativa, la preeminencia del poder civil, y el fortalecimiento de la cultura democrática. Así mismo, tiene en cuenta los elementos de la justicia transicional, a saber: verdad, justicia y reparación.