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Title:Probabilistic Modeling and Verification of Large Scale Systems
Author(s):Kwon, YoungMin
Doctoral Committee Chair(s):Agha, Gul A.
Department / Program:Computer Science
Discipline:Computer Science
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Computer Science
Abstract:Many large scale systems have a stochastic behavior. Such stochastic behavior is the result of the randomness in the systems' operating environments. It can also be the result of the use of randomized protocols that are used to reduce the need for costly synchronization. We abstract a system state as a probability mass function (pmf); a pmf is succinct in representation and is informative enough to describe many useful aggregate behaviors of the system. We model the dynamics of the state transitions as a Discrete Time Markov Chain (DTMC) and develop an on-line model estimation method as well as a goodness of fit test that statistically validates the model. We develop a probabilistic temporal logic called iLTL in order to specify aggregate behaviors of large scale systems. Many important performance criteria on DTMC models can be accurately expressed in iLTL. For the iLTL specifications, performance evaluation is systematically performed through a process of model checking. If a performance criterion is not satisfiable, the model checker returns a sequence of computations that violates the specification in order to help users fix the problem. We show the usefulness of our methodology through an experiment with a wireless sensor network of 90 nodes.
Issue Date:2006
Description:99 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006.
Other Identifier(s):(MiAaPQ)AAI3223636
Date Available in IDEALS:2015-09-25
Date Deposited:2006

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