PURPOSE A new image-based methodology is developed for estimating the apparent space-filling properties of an object of interest in PET imaging without need for a robust segmentation step and used to recover accurate estimates of total lesion activity (TLA). METHODS A multifractal approach and the fractal dimension are proposed to recover the apparent space-filling index of a lesion (tumor vo...

Our solution to the speciication problem in the speciication language TLA+ is based on a model of operation where several components proceed synchronously. Our rst speciication concerns a simpliied controller and abstracts from many details given in the informal problem description. We successively add modules to build a model of the state of the steam boiler, detect failures, and model message...

INTRODUCTION Chronic asthma is a significant burden for individual sufferers, adversely impacting their quality of working and social life, as well as being a major cost to the National Health Service (NHS). Temperature-controlled laminar airflow (TLA) therapy provides asthma patients at BTS/SIGN step 4/5 an add-on treatment option that is non-invasive and has been shown in clinical studies to ...

We present a complete solution to the Broy Lamport speci cation problem Our speci cations are written in TLA a formal lan guage based on TLA We give the high levels of structured proofs and sketch the lower levels which will appear in full elsewhere

We have a great deal of experience using the specification language TLA and its model checker TLC to analyze protocols designed at Digital and Compaq (both now part of HP). The tools and techniques we have developed apply equally well to software and hardware designs. In this paper, we describe our experience using TLA and TLC to verify cache-coherence protocols.

The Timed-Buffer Distributed Voting Algorithm (TB-DVA), a secure distributed voting protocol, is introduced and described. A formal specification of the algorithm is developed using Lamport’s specification language TLA+. Then strategies for proving the correctness of the specification using Lamport’s Temporal Logic of Actions (TLA) are discussed.

Design patterns are reuse artifacts meant to improve the quality of software designs as well as the productivity of designers. Patterns (and their relationships) are mostly described in an informal fashion which leads to ambiguity and limits tools support. This has worsened with the growing number of well-established and candidate patterns. This paper discusses how to formally specify the "solu...

Naturalistic theories of language acquisition assume learners to be endowed with some innate language knowledge. The purpose of this innate knowledge is to facilitate language acquisition by constraining a learner’s hypothesis space. This paper discusses a naturalistic learning system (a Categorial Grammar Learner (CGL)) that differs from previous learners (such as the Triggering Learning Algor...

TLA+ is a language intended for the high-level specification of reactive, distributed, and in particular asynchronous systems. Combining the linear-time temporal logic TLA and classical set-theory, it provides an expressive specification formalism and supports assertional verification.