Distributed Adaptive Fault-Tolerant Control of Uncertain Multi-Agent Systems

This paper presents an adaptive fault-tolerant control (FTC) scheme for a class of nonlinear uncertain multi-agent systems. A local FTC scheme is designed for each agent using local measurements and suitable information exchanged between neighboring agents. Each local FTC scheme consists of a fault diagnosis module and a reconfigurable controller module comprised of a baseline controller and two adaptive fault-tolerant controllers activated after fault detection and after fault isolation, respectively. Under certain assumptions, the closed-loop system's stability and leader-follower consensus properties are rigorously established under different modes of the FTC system, including the time-period before possible fault detection, between fault detection and possible isolation, and after fault isolation

FTC vs. Toysmart

Last summer, Toysmart agreed to a settlement with the Federal Trade Commission concerning use of its customer information database. Under the terms of the settlement, the defunct Internet toy retailer was permitted to sell customer information without either providing its former customers notice or giving them an opportunity to block the sale or use of their personal information. This issue ignited a privacy-rights maelstrom, but ended anti-climatically for Toysmart; in January, Buena Vista Internet Group, a Disney subsidiary and 60% majority shareholder of Toysmart, agreed to compensate the company\u27s creditors $50,000 for the privilege of destroying the database. U.S. Bankruptcy Court Judge Carol Kenner approved this plan, subject to the limitation that Toysmart attorneys must retain the list and destroy it (rather than physically transfer it to Buena Vista) when all creditor claims are satisfied

Robust fault tolerant control framework using uncertain Takagi-Sugeno fuzzy models

This chapter is concerned with the introduction of a fault tolerant control (FTC) framework using uncertain Takagi-Sugeno (FS) fuzzy models. Depending on how much information is available about the fault, the framework gives rise to passive FTC, active FTC without controller reconfiguration and active FTC with controller reconfiguration. The design is performed using a Linear Matrix Inequality (LMI)-based synthesis that directly takes into account the TS description of the system and its uncertainties. An example based on a mobile robot is used to show the application of this methodologyPeer ReviewedPreprin

Robust fault-tolerant control

There are two main approaches to fault-tolerant control: passive and active.This thesis presents both methods for passive and for active FTC

The toughest battleground: schools

Over four decades ago, Milton Friedman published Capitalism and Freedom (Friedman 1962). This insightful little book traveled across a broad range of important topics collected around the theme of how government can best operate within a free society. The message was expanded two decades later in Free to Choose (Friedman and Friedman 1980). At the time, the battle of the ideas introduced by these books was being waged by nations, nations that were willing to contemplate war over how societies should be organized. As we look back on how the world has changed since then, I wonder if anybody guessed that changing the schools would be the most difficult subject taken on. It is useful to look at what progress has been made, what evidence exists on the topic, and what the future might hold in the area of education. The simple question is: Why are the schools tougher to crack than the walls of the Communist bloc?Education ; School choice