Expert systems are typically expected to be able to justify their decisions to the user. This paper argues that help systems or tutoring systems based on a plan recognizer can equally benefit from an explanation component. To this end a plan recognition system equippedwith a usermodel is presented and the techniques required to generate precise and useful justifications of its results are intro...

Modern file systems associate the deletion of a file with the release of the storage associated with that file, and file writes with the irrevocable change of file contents. We propose that this model of file system behavior is a relic of the past, when disk storage was a scarce resource. We believe that the correct model should ensure that all user actions are revocable. Deleting a file should...

Plan recognition is an important task whenever a system has to take into account an agent's actions and goals in order to be able to react adequately. Many plan recognizers, however, are only capable of deriving a set of equally plausible plan hypotheses. This is of little use whenever the system actually has to react, e.g., when an intelligent help system is asked to give advice to the user of...

The movement to legalize marijuana is a war being waged at the ballot box of many states. The movement is sponsored by a small group attempting to dictate changes in laws surrounding the use, as well as the cultivation and distribution of marijuana. Organizations such as NORML (National Organization for Reformed Marijuana Laws); The Lindesmith Center; and, the Drug Policy Group are pushing the ...

THE ACCOUNTABILITY DEBATE TENDS TO DEVOLVE INTO A BATTLE between the pro-testing and anti-testing crowds. But when it comes to the design of a school accountability system, the devil is truly in the details. A well-designed accountability plan may go a long way toward giving school personnel the kinds of signals they need to improve performance. However, a poorly designed scheme, which ignores ...

People always travel with their friends. Some of them would like to design their travel plan together while some others would like to design their plan singly. Prior studies most focus on the single decision context. This paper investigates the collaborative customization in the joint decision and joint consumption context, and the information presentation format (attribute-based vs. bundle-bas...

In this paper we have gathered some interesting techniques to evaluate educative systems. Our main purpose is to evaluate HEZINET, an adaptive hypermedia System for education available commercially. Therefore, we also include a system evaluation plan to identify which types and techniques of evaluation will be needed in order to accomplish it.

This paper describes research into planning in an uncertain environment. In particular, it describes U-Plan, a planning system that constructs quantitatively ranked plans given an incomplete description of the state of the world. Information acquisition operators are then applied to choose between plan alternatives. U-Plan has been trialled in a simulated one-on-one air combat domain. Results o...

This paper addresses the problem of recognizing the behavior of a person suffering from Alzheimer’s disease at early-intermediate stages. We present a keyhole plan recognition model, based on lattice theory and action description logic, which transforms the recognition problem into a classification issue. This approach allows us to formalize the plausible incoherent intentions of the patient, r...

CHAPTER I: INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Practical Problem Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 Mathematical Programming Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.3 Mathematical Programming in Use . . . . . . . . ...