Constructing Probabilistic Process Models Based on Hidden Markov Models for Resource Allocation

Author(s):  
Berny Carrera ◽  
Jae-Yoon Jung
2008 ◽  
Author(s):  
Σωτήριος Χατζής

Στόχος της διδακτορικής αυτής διατριβής ήταν η ενδελεχής μελέτη των μεθοδολογιών μηχανικής μάθησης, και η χάραξη νέων δρόμων στον χώρο, με την εισαγωγή πρωτοτύπων μεθοδολογιών και καινοτόμων επαναστατικών θεωρήσεων αναγνώρισης προτύπων. Μεγάλη έμφαση εδόθη στις τεχνικές Variational Bayesian inference, που κατά την γνώμη του συγγραφέως αποτελούν το αύριο των μεθοδολογιών αναγνώρισης προτύπων των βασισμένων σε προσεγγίσεις statistical clustering, με συνεισφορά ενός πρωτότυπου μοντέλου εύρωστης αναγνώρισης προτύπων για πολυδιάστατα δεδομένα, καθώς και οι μεθοδολογίες fuzzy clustering. Σε αυτό τον τελευταίο χώρο εντοπίζεται και η μεγαλύτερη και σημαντικότερη συνεισφορά της παρούσης διατριβής, με την εισαγωγή μιας νέας θεώρησης του τι είναι fuzzy clustering, υπό την έννοια του τι εργασίες μηχανικής μάθησης μπορεί κανείς να περαιώσει με χρήση fuzzy clustering, κατά την οποία ο αλγόριθμος FCM αναδεικνύεται σε μια πλεονεκτηματική εναλλακτική του ΕΜ αλγορίθμου (και λοιπών statistical clustering προσεγγίσεων) για την εκπαίδευση πολλών μορφών πιθανοτικών παραγωγικών μοντέλων. Πλέον αυτών, η εργασία αυτή παρείχε ακόμα ένα καινοτόμο αλγόριθμο hidden Markov models, προσφέρων εξαιρετικά πλεονεκτήματα σε ένα πολύ μεγάλο εύρος εφαρμογών σε σχέση με τις σημερινές τεχνικές, και τέλος, μια νέα μέθοδο ταυτοποίησης ομιλητή, στηριγμένη σε Gaussian process models.


2013 ◽  
Vol 411-414 ◽  
pp. 2106-2110
Author(s):  
Shi Ping Du ◽  
Jian Wang ◽  
Yu Ming Wei

A hidden Markov model (HMM) encompasses a large class of stochastic process models and has been successfully applied to a number of scientific and engineering problems, including speech and other pattern recognition problems, and biological sequence analysis. A major restriction is found, however, in conventional HMM, i.e., it is ill-suited to capture the interactions among different models. A variety of coupled hidden Markov models (CHMMs) have recently been proposed as extensions of HMM to better characterize multiple interdependent sequences. The resulting models have multiple state variables that are temporally coupled via matrices of conditional probabilities. This paper study is focused on the coupled discrete HMM, there are two state variables in the network. By generalizing forward-backward algorithm, Viterbi algorithm and Baum-Welch algorithm commonly used in conventional HMM to accommodate two state variables, several new formulae solving the 2-chain coupled discrete HMM probability evaluation, decoding and training problem are theoretically derived.


2015 ◽  
Vol 135 (12) ◽  
pp. 1517-1523 ◽  
Author(s):  
Yicheng Jin ◽  
Takuto Sakuma ◽  
Shohei Kato ◽  
Tsutomu Kunitachi

Author(s):  
M. Vidyasagar

This book explores important aspects of Markov and hidden Markov processes and the applications of these ideas to various problems in computational biology. It starts from first principles, so that no previous knowledge of probability is necessary. However, the work is rigorous and mathematical, making it useful to engineers and mathematicians, even those not interested in biological applications. A range of exercises is provided, including drills to familiarize the reader with concepts and more advanced problems that require deep thinking about the theory. Biological applications are taken from post-genomic biology, especially genomics and proteomics. The topics examined include standard material such as the Perron–Frobenius theorem, transient and recurrent states, hitting probabilities and hitting times, maximum likelihood estimation, the Viterbi algorithm, and the Baum–Welch algorithm. The book contains discussions of extremely useful topics not usually seen at the basic level, such as ergodicity of Markov processes, Markov Chain Monte Carlo (MCMC), information theory, and large deviation theory for both i.i.d and Markov processes. It also presents state-of-the-art realization theory for hidden Markov models. Among biological applications, it offers an in-depth look at the BLAST (Basic Local Alignment Search Technique) algorithm, including a comprehensive explanation of the underlying theory. Other applications such as profile hidden Markov models are also explored.


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