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eslami--moharram
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Designing and Implementing a Morphological Analyzer for Persian Language
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor)
Abstract
In this thesis, the theoretical foundation, the way of implementation and the uses of Pars Morph, a Persian morphological analyzer is introduced. Pars Morph is a rule-based Persian morphological analysis system, which analyzes the internal structure of word in Persian and determines the grammatical category and function of the word parts. Pars Morph being in link with a lexicon covering about 45000 lexemes and based on morphological rules in Persian can analyze the structure of complex lexemes and their possible inflected forms and even out-of-lexicon words.
Accuracy rate of the first version of Pars Morph is about 95% which could be enhanced to 100% by applying the regulations on...
Accuracy rate of the first version of Pars Morph is about 95% which could be enhanced to 100% by applying the regulations on...
Derivation and Lexicalization in Persian
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor)
Abstract
Derivation and lexicalization are two critical subjects in morphology and word-formation processes. Although wide studies have been taken place about derivation, which is one of the most productive processes of word-formation along with composition, there has been no proper attention to lexicalization, which sometimes happens after derivation. One of the applications of this thesis is developing dictionaries. With regard to this issue that there is no scientific and complete method for recording lexical units in Persian dictionaries, we decided to propose a scientific method to do the mentioned activity by studying derivational processes, affixes and lexicalization phenomena and its relation...
The Distribution of Distinctive Features in Persian Phonotactics and Its Role On Robust Speech Perception
, M.Sc. Thesis Sharif University of Technology ; Vazirnezhad, Bahram (Supervisor) ; Eslami, Moharram (Supervisor)
Abstract
In this project we have investigated the distribution of distinctive features in Persian lexicon. According to our hypothesis the distribution of distinctive features should be compliant with the amount of perceptibility of acoustic cues to those features in their contexts. The results show that the Sonority Sequencing Principle and the Syllable Contact Law which are previously explained via phonological constraints have a phonetic (perceptual) basis. The more acoustic cues to a distinctive features are perceptually strong in a context the more the consonant is diversed using different values of that feature in that context. The results of intelligibility tests show that consonants are...
Automatic Labeling of Prosody in Persian Unmarked Speech
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor) ; Bahrani, Mohammad (Co-Advisor)
Abstract
Prosodic annotations are used for locating and characterizing prominent parts in utterances as well as identifying and describing boundaries of coherent stretches of speech. Automatic detection and labeling of prosodic events in speech has received much attention in recent years since prosody is intricately bound to the semantics of the utterance. Recognition of prosodic events is important for spoken language applications such as automatic understanding and translation of speech. Moreover, corpora labeled with prosodic markers are essential for building speech synthesizers that use data-driven approaches to generate natural speech. Such databases are important to reach a better...
Phonetic Representation of Intonation in Persian Vocative Structures
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor) ; Bahrani, Mohammad (Co-Advisor)
Abstract
This study investigates the intonational properties of vocative structure in standard Persian in the framework of Auto-segmental-metrical phonology. Pitch accent is one of the elements whithin this framework, that refers to the prominence in the utterance. In Persian all lexical units are stressed in their final syllable and there is a language-specific feature in Persian according to which pitch accents are aligned with lexically stressed syllables. Contrary to the said feature, previous studies claim that in vocative structure, it is the first syllable that is accented, due to the difference existed between intonation pattern of vocative structure compared to its citation form. The data...
Introducing an Approach to Build a Phrase Structure Treebank Using Persian Dependency Treebank
, M.Sc. Thesis Sharif University of Technology ; Bahrani, Mohammad (Supervisor) ; Eslami, Moharram (Co-Advisor)
Abstract
Treebanks are useful in many applications of natural language processing such as machine translation, speech recognition, information extraction, and etc. They are also being used in theoretical linguistics to study languages. For instance, they are valuable for development of different syntactic theories, calculation of frequency of syntactic rules, evaluation and comparison of statistical models and etc.
The most treebanks are based on phrase structure grammar or dependency grammar. In a phrase structure treebank, a sentence is divided to phrases. In this representation, a phrase is composed of several words. But in the dependency treebank, connection between two words is based on the...
The most treebanks are based on phrase structure grammar or dependency grammar. In a phrase structure treebank, a sentence is divided to phrases. In this representation, a phrase is composed of several words. But in the dependency treebank, connection between two words is based on the...
Phonetics of Persian Intonation
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor) ; Sameti, Hossein (Co-Advisor)
Abstract
This study is a research on Persian Intonational System, which was carried out within the Autosegmental-Metrical framework.The intonational elements of Persian are represented by two distinctive levels (High and Low). Persian intonation system enjoys three main elements: pitch accents, Phrase accents and boundary tones. Every intonational element has its own meaning. The data of study is about 200 utterances produced by two Persian native speaker one male and one female. These utterances have been annotated in four levels in PToBI: phoneme level, word level, tone level and break index level. In this study we aimed to formulate the acoustic representation of the intonational elements by three...
An Investigation into Reduplication and Lexicalization in Persian
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor) ; Khosravizadeh, Parvaneh (Supervisor)
Abstract
This study aims at classifying outputs of Reduplication (Total and Partial Reduplication) in Persian, in order to demonstrate the types and processes which lead to the lexicalization of some reduplicated forms and assign them lexical position in lexicography as individual lexical entries. There are distinct phonological, morphological and semantic evidences behind the lexicalization of some types of reduplicated items in Persian. Approximately about 269 totally reduplicated words and 293 partially reduplicated words have been collected and analyzed according to the said morphological, phonological and semantic considerations. Partial and Total Reduplication process is one of the productive...
Preposition Semantic Analysis Via Persian Text Corpus
, M.Sc. Thesis Sharif University of Technology ; Khosravizadeh, Parvaneh (Supervisor) ; Eslami, Moharram (Co-Advisor)
Abstract
Prepositions are considered as frequent linguistic units whose role in computational linguistics cannot be neglected. These units are often thought to have no lexical meaning; moreover, it is a widely held belief that prepositions are solely used for sentence cohesion. On the other hand, in some cases the substitution of one particular preposition with another one would change the meaning of sentences.
The main question which is concerned in this thesis is “Whether prepositions should be regarded as meaningful units or semantically empty units?” In order to achieve this goal, the present study is conducted as a library research and a field research. In the library research, 1000...
The main question which is concerned in this thesis is “Whether prepositions should be regarded as meaningful units or semantically empty units?” In order to achieve this goal, the present study is conducted as a library research and a field research. In the library research, 1000...
Phonetic Representation of Intonational Elements in Persian Emotional Speech
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor) ; Vazirnezhad, Bahram (Co-Advisor)
Abstract
Theoretically, it has been proved that pitch changes has an specific phonological system in Persian and the main intonational elements (i.e. pitch accent, phrase tone and boundary tones) have a known independent identity and can change independently. These changes give different intonational forms to utterances. In addition, it has been demonstrated that sound pattern of Persian syntax units follow HAP (Head Avoidance Principle) and Always, the farthest argument from the head takes the pitch accent. In the present thesis, phonetic values of intonational elements in 5 emotions of PESD database utterances (i.e. Anger, Disgust, Sadness, Happiness and Fear) are quantified and then, they are...
Phonetic Representation of Pitch Accent in Persian Words
, M.Sc. Thesis Sharif University of Technology ; Eslami, Moharram (Supervisor) ; Sameti, Hossein (Co-Advisor)
Abstract
The stress positions of the words are determined according to the type of their morphological elements. Persian Words often have a fixed position for stress. However, Persian wordforms show different stress positions, based on their morpheme types or in the other words, their bound-non derivational affixes. Inflectional affixes accept stress, whereas clitics do not. In the present research we studied both types of non derivational affixes considering their phonetic features meaning fundamental frequency and duration. The phonetic representation of the pitch accent as the phonemic- intonational element was given as a result of this study, as well. The differences in the phonetic...
Study on optimized piled-raft foundations (PRF) performance with connected and non-connected piles- three case histories
, Article International Journal of Civil Engineering ; Volume 10, Issue 2 , 2012 , Pages 100-111 ; 17350522 (ISSN) ; Veiskarami, M ; Eslami, M. M ; Sharif University of Technology
2012
Abstract
It has been realized that the raft (mat) foundations are capable of bearing very large loads when they are assisted with a pile group. The contribution of both raft and piles to carry the surcharge loads is taken into account, considering the stiffness and strength of involved elements in the system, i.e. piles, raft and surrounding soil. The piles are usually required not to ensure the overall stability of the foundation but to act as settlement reducers. There is an alternative design in which, the piles are nonconnected from the raft to reduce the settlement, which are then known to be "settlement reducer non-connected piles" to increase the system stiffness. In this paper, two and three...
A biolinguistic approach to clausal gerunds and TP-defective Gerunds in second language syntax
, Article Procedia - Social and Behavioral Sciences ; Volume 32 , 2012 , Pages 246-251 ; 18770428 (ISSN) ; Ahmadvand, M ; Sharif University of Technology
2012
Abstract
This paper looks at the question of what second language learners know about syntax but could not have "learned." It is hypothesized that if we show second-language learners know a particular aspect of the second language (L2) syntax which could not have been learned via formal explanation, and that aspect did not exist in their first language (L1) syntax, we can argue that there is something internal (in their minds/brains) that is responsible for such knowledge - the language organ. The study is intended to offer evidence for biolinguistics from the field of Second Language Acquisition
Time-Variant evaluation of electromagnetic forces on transformer windings during inrush current and short-circuit by FEM
, Article Arabian Journal for Science and Engineering ; Volume 38, Issue 4 , 2013 , Pages 883-893 ; 13198025 (ISSN) ; Vakilian, M ; Sharif University of Technology
2013
Abstract
Time-variant axial and radial electromagnetic for ces under inrush current and short-circuit current are calculated (by finite element method; FEM) and compared. A simplified analytic method is presented for computation of inrush current in transformer. The simulation results obtained by this method are compared with the measured values. A compact three-phase, core-type 132/20 KV, 30 MVA, power transformer is modeled, employing two-dimensional (2D) FEM, the different forces under short-circuit and inrush current conditions are evaluated as a function of time. The simulation results for this sample transformer show that the inrush current axial force is larger than clamping force (which is...
Fault-tolerant controller design for ALSTOM gasifier benchmark challenge
, Article Journal of Advanced Research in Dynamical and Control Systems ; Volume 7, Issue 1 , 2015 , Pages 90-116 ; 1943023X (ISSN) ; Babazadeh, M ; Sharif University of Technology
Institute of Advanced Scientific Research, Inc
2015
Abstract
In this paper, a new fully decentralized control strategy for the ALESTOM gasifier benchmark is presented. The proposed decentralized fault-tolerant control scheme overcomes the conventional drawbacks of the previously developed centralized strategies for the linearized model of gasifier system. To achieve the objective, first, the best pairing has been selected based on integrity screening tools as well as physical considerations. Then, a fully decentralized Proportional Integral (PI) controller has been proposed. Finally simulation results performed in MATLAB show that the designed controller is capable of achieving desired performance for three different scenarios, i.e., full, half and no...
Integrity of LTI Time-Delay Systems
, Article IEEE Transactions on Automatic Control ; Volume 61, Issue 2 , 2016 , Pages 562-567 ; 00189286 (ISSN) ; Nobakhti, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
Multivariate ring-model description and the delay operator are used to represent LTI systems with delays in the states, inputs and outputs. By using the concept of μ-Decentralized Fixed Mode (μ-DFM) and generalized Nyquist criterion, it is demonstrated that the steady-state gain information yet remains the only information necessary to assess integral stabilizability (IS), integral controllability (IC), integral controllability with integrity (ICI) and decentralized integral controllability (DIC) of LTI time-delay systems. The conditions involve no approximation of the delay terms. Furthermore, it is demonstrated that a previous assumption on the existence of a stabilizing and stable...
A unified acceptance test framework for power plant gas turbine control systems
, Article ISA Transactions ; Volume 85 , February , 2018 , Pages 262-273 ; 00190578 (ISSN) ; Babazadeh, M ; Sharif University of Technology
ISA - Instrumentation, Systems, and Automation Society
2018
Abstract
Renovation and retrofit of gas turbine control systems yield significant economic savings, enhanced reliability, and improved performance. In recent years, the gas turbine industry is increasingly facing the need to well-established procedures for the acceptance tests of renovated control systems. This paper proposes a unified framework to evaluate the performance of renovated gas turbine control systems. Under a set of assumptions on the ambient and fuel conditions, a low-complexity modular model is presented and identified using optimization-oriented identification techniques. The accuracy of the proposed model is validated through experimental studies in full-load, min-load, and no-load...
A unified acceptance test framework for power plant gas turbine control systems
, Article ISA Transactions ; Volume 85 , 2019 , Pages 262-273 ; 00190578 (ISSN) ; Babazadeh, M ; Sharif University of Technology
ISA - Instrumentation, Systems, and Automation Society
2019
Abstract
Renovation and retrofit of gas turbine control systems yield significant economic savings, enhanced reliability, and improved performance. In recent years, the gas turbine industry is increasingly facing the need to well-established procedures for the acceptance tests of renovated control systems. This paper proposes a unified framework to evaluate the performance of renovated gas turbine control systems. Under a set of assumptions on the ambient and fuel conditions, a low-complexity modular model is presented and identified using optimization-oriented identification techniques. The accuracy of the proposed model is validated through experimental studies in full-load, min-load, and no-load...
Control performance enhancement of gas turbines in the minimum command selection strategy
, Article ISA Transactions ; 2020 ; Banazadeh, A ; Sharif University of Technology
ISA - Instrumentation, Systems, and Automation Society
2020
Abstract
Three novel methods, named α, ζ and ϵ, are suggested in this paper to recover the performance loss during switching in the gas turbine control systems. The Minimum Command Selection (MCS) in the gas turbine control systems prompts this performance loss. Any step towards more productivity with less aging factors have a great impact on the gas turbine's lifetime profit and vice versa. Although many hardware upgrades have been studied and applied to accomplish this, in many cases a low-risk manipulation in the software may yield equivalent achievement. State of the art gas turbine control systems are supposed to handle various forms of disturbances, several operation modes and relatively high...
Control performance enhancement of gas turbines in the minimum command selection strategy
, Article ISA Transactions ; Volume 112 , 2021 , Pages 186-198 ; 00190578 (ISSN) ; Banazadeh, A ; Sharif University of Technology
ISA - Instrumentation, Systems, and Automation Society
2021
Abstract
Three novel methods, named α, ζ and ϵ, are suggested in this paper to recover the performance loss during switching in the gas turbine control systems. The Minimum Command Selection (MCS) in the gas turbine control systems prompts this performance loss. Any step towards more productivity with less aging factors have a great impact on the gas turbine's lifetime profit and vice versa. Although many hardware upgrades have been studied and applied to accomplish this, in many cases a low-risk manipulation in the software may yield equivalent achievement. State of the art gas turbine control systems are supposed to handle various forms of disturbances, several operation modes and relatively high...