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taraghi-delgarm--razieh
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Long Term Seasonal Rainfall and Stramflow Prediction using Ocean- Atmospheric Climate Variables (case study: Bukan Dam)
, M.Sc. Thesis Sharif University of Technology ; Tajrishy, Masoud (Supervisor)
Abstract
Due to water resources restriction and increasing water demand, the optimal utilization of water resources in the country is more and more necessary. Optimal utilization of these resources highly require more precise prediction of the river's stream entering the dam with anticipated intervals of one to some months. In recent decades, identification of large-scale signals as predictors of hydrological climate changes has created great expectations and a lot of studies have been done in this area.One of the most important principles of planning and management of water resources in each country from the point of view of hydrological, the rainfall is forecast. In this study,using principal...
An analysis of why rehabilitation and balancing programs for aquifers do not meet water organizations' targets (a case study of the Qazvin aquifer in Iran)
, Article Agricultural Water Management ; Volume 281 , 2023 ; 03783774 (ISSN) ; Mazandarani Zadeh, H ; Zarghami, M ; Demeke, B. W ; Taraghi Delgarm, R ; Sharif University of Technology
Elsevier B.V
2023
Abstract
Iran experiences insufficient precipitation, resulting in excessive use of groundwater resources, leading to negative water balances in many plains. As a result, the Ministry of Energy began implementing the Groundwater Rehabilitation and Balancing Plan (GRBP) in 2006 to replenish the aquifers. The plan includes measures such as Blocking Illegal Wells (BIW), Equipping Wells with Volumetric Meters (EWVM), Increasing Patrol and Control (IPC), and inspecting the degree of exploitation of groundwater, etc. In this study, researchers examined the level of social agreement between farmers and experts on the effectiveness of the Ministry of Energy's policies for the GRBP and assessed the farmers'...
, M.Sc. Thesis Sharif University of Technology ; Farzaneh, Forouhar (Supervisor)
Abstract
In recent years due to the advances in semiconductor technology and the ability to implement small-scale manufacturing, communication at 60 GHz band receive more attention than ever has been. The use of this frequency band is not only about 7-9 GHz unlicensed broadband access provided, but getting smaller devices make it possible to use multiple antennas at the transmitter and receiver, and thus taking advantage of multiple input – multiple output systems. Antennas used in these systems should have features such as small size , low weight, high gain and bandwidth and also they should keep their high efficiency and gainat high frequency range (about a few GHz ). To achieve these features...
Design and Preparation of a Persian Semantic Corpus Using Abstract Meaning Representation
, M.Sc. Thesis Sharif University of Technology ; Bahrani, Mohammad (Supervisor) ; Shojaie, Razieh (Supervisor)
Abstract
To keep in line with the day to day advancements in the fields of computational linguistics and natural language processing, and the growing attention of researchers to semantic processing, this thesis presents the design and preparation of a Persian semantic corpus using Abstract Meaning Representation (AMR). This semantic representation pairs each sentence with a single rooted, acyclic, directed graph, which is human and computer readable. Moreover, this representation paves the way for the creation of large semantic corpora. In order to bring such benefits to Persian, in this thesis we present solutions for representing Persian sentences in the framework of AMR. Moreover, a corpus of 150...
Ezafe Recognition Using Dependency Parsing
, M.Sc. Thesis Sharif University of Technology ; Bahrani, Mohammad (Supervisor) ; Shojaei, Razieh (Co-Supervisor)
Abstract
Ezafe is regarded as one of the most controversial and challenging issues in different Persian Language Processing (NLP) fields. It is recognized and pronounced but usually not written. So, this results in a high degree of ambiguity in Persian texts. Dependency grammar plays a significant role in optimization problems. So, to recognize the position of Ezafe in a sentence, this grammar is used in this current study. This method helps speed up computer operations and use low memory. Within this framework, first we take a close look at Ezafe distribution in Persian text. We use Uppsala Persian Dependency Corpus (2015) to analyze parsed sentences. The Ezafe constructions under study include...
Multi-objective optimization of a cascade refrigeration system: exergetic, economic, environmental, and inherent safety analysis
, Article Applied Thermal Engineering ; Volume 107 , 2016 , Pages 804-817 ; 13594311 (ISSN) ; Shahhosseini, H ; Delgarm, N ; Lee, M ; Bahadori, A ; Sharif University of Technology
Elsevier Ltd
2016
Abstract
Inherently safer design is the new approach to maximize the overall safety of a process plant. This approach suggests some risk reduction strategies to be implemented in the early stages of design. In this paper a multi-objective optimization was performed considering economic, exergetic, and environmental aspects besides evaluation of the inherent safety level of a cascade refrigeration system. The capital costs, the processing costs, and the social cost due to CO2 emission were considered to be included in the economic objective function. Exergetic efficiency of the plant was considered as the second objective function. As a measure of inherent safety level, Quantitative Risk Assessment...
A Semantic Valency Lexicon for Persian Predicates and Visualization of their Relations
, M.Sc. Thesis Sharif University of Technology ; Khosravi Zadeh, Parvaneh (Supervisor) ; Shojaei, Razieh (Supervisor)
Abstract
The highest and most difficult layer of Natural Language Processing, is the understanding of meaning. As a result, lexicons and annotated corpora are of the utmost importance in this area. However, the lack of such semantic resources, especially in Abstract Meaning Representation (AMR), is one of the main issues in this field for Persian Language. This work by modeling PropBank, a semantic valency lexicon for English predicates, is the first step towards building such lexicons for Persian Language with the focus on AMR. Thus, a guideline describing how to annotate the Persian predicates is provided which first evaluates the common structures between the two languages and then focuses on the...
Persian Causative/Inchoative Alternation from an LFG Perspective
, M.Sc. Thesis Sharif University of Technology ; Khosravizadeh, Parvaneh (Supervisor) ; Shojaee, Razieh (Supervisor)
Abstract
This study attempts to describe and analyze Persian speakers’ linguistic knowledge of different types of causative and inchoative constructions within the framework of Lexical Functional Grammar (LFG). In order to do so, different studies on Persian causative alternations within theories other than LFG as well as causative alternations in other languages within LFG are reviewed. Next, different types of causative constructions are categorized conceptually and structurally after they are extracted from Bijankhan corpus (2005). Then they are analyzed syntactically and semantically. In this regard, we represent syntactic and semantic structures based on LFG as a monostratal theory. After that,...
Persian Compound Verb Database with the Verbal Element: “Shodan”
, M.Sc. Thesis Sharif University of Technology ; Khosravizadeh, Parvaneh (Supervisor) ; Shojaie, Razieh (Supervisor)
Abstract
Compound verbs (CVs) and its components, have been widely discussed in previous linguistics' researches as one of the most important and fundamental constructions of Persian language. Nevertheless most of the arguments and assumptions in those researches align with each other and studying CVs from another aspect with a different viewpoint has not been considered very much in order to solve nodes and issues in this area. We have endeavored in this thesis to review and criticize the portrayed definitions of the CVs, reconsider this construction and the syntactical and semantical roles of verbal and non-verbal elements in this combination from another point of view, and revise the previous...
Free vibration analysis of cylindrical panels with spiral cross section
, Article International Journal of Mechanical Sciences ; Volume 133 , 2017 , Pages 376-386 ; 00207403 (ISSN) ; Ahmadian, M. T ; Asghari, M ; Pugno, N. M ; Sharif University of Technology
2017
Abstract
In this paper, free vibration of open noncircular cylinders with spiral cross section are studied under arbitrary boundary conditions. For deriving the strain energy function, Kirchhoff-Love hypotheses are employed. To obtain the solutions, Rayleigh-Ritz technique is implemented by selecting Chebyshev orthogonal polynomials of first kind as admissible displacement functions in three directions. Convergence of the proposed formulation is verified for spiral cylindrical panel and the results are compared with those of ABAQUS. Parametric study is undertaken to highlight the effect of inner radius, separation distance, subtended angle, thickness, and length of the spiral cylinders on the free...
A shell model for free vibration analysis of carbon nanoscroll
, Article Materials ; Volume 10, Issue 4 , 2017 ; 19961944 (ISSN) ; Ahmadian, M. T ; Asghari, M ; Pugno, N. M ; Sharif University of Technology
2017
Abstract
Carbon nanoscroll (CNS) is a graphene sheet rolled into a spiral structure with great potential for different applications in nanotechnology. In this paper, an equivalent open shell model is presented to study the vibration behavior of a CNS with arbitrary boundary conditions. The equivalent parameters used for modeling the carbon nanotubes are implemented to simulate the CNS. The interactions between the layers of CNS due to van der Waals forces are included in the model. The uniformly distributed translational and torsional springs along the boundaries are considered to achieve a unified solution for different boundary conditions. To study the vibration characteristics of CNS, total energy...
Developing an Equivalent Shell Model Based on Classical and Nonlocal Theory for Vibration Analysis of Carbon Nanoscrolls
, Ph.D. Dissertation Sharif University of Technology ; Ahmadian, Mohammad Taghi (Supervisor) ; Asghari, Mohsen (Supervisor)
Abstract
Carbon nanoscroll (CNS) is a graphene sheet rolled into a spiral structure. The Equilibrium structure of a CNS depends on the elastic bending energy and van der Waals interactions between layers. In recent decade, research on CNSs received high attention after discovering new techniques to produce high purity CNSs. Modal analysis of the CNS is essential in various applications like sensors and actuators. Therefore, in this research, a shell model for free vibration analysis of the CNS is proposed. After considering CNS as an equivalent shell, the assumed mode technique is used to extract natural frequencies and mode shapes of CNSs in different boundary conditions. The effect of geometric...