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Towards model-based testing patterns for enhancing agile methodologies
, Article Frontiers in Artificial Intelligence and Applications ; Volume 246 , 2012 , Pages 57-72 ; 09226389 (ISSN) ; 9781614991243 (ISBN) ; Ramsin, R ; Fujita H ; Revetria R ; Sharif University of Technology
2012
Abstract
Quality is one of the most important issues in the context of agile and lightweight methodologies. These methodologies recommend automated testing as the main method for quality assurance; however, they are plagued with several deficiencies in this regard, including complex and difficult-to-maintain test case scripts. Model-based testing is an approach for automating the test creation process through replacing individual test-case design with abstract models. In this paper, we explore a set of patterns based on current methods used in model-based testing which can be used to ameliorate the abovementioned deficiencies in agile/lightweight methodologies. We then demonstrate how these patterns...
Modeling, control and voltage unbalance compensation in a four-switch rectifier with input power factor correction
, Article PEDSTC 2013 - 4th Annual International Power Electronics, Drive Systems and Technologies Conference ; 2013 , Pages 148-152 ; 9781467344845 (ISBN) ; Shahbazi, M ; Zolghadri, M ; Sharif University of Technology
2013
Abstract
In this paper, a small signal model is proposed for four-switch rectifier with input power factor correction. The required transfer functions are determined and calculated for a typical rectifier. This model is used to design an appropriate controller with defined characteristic to improve the rectifier performance. Another controller is used to compensate capacitors dc voltage difference. The system is simulated in Simulink and the results are provided. These results confirm the accuracy of the developed model, and also the effectiveness of the proposed controllers
Self-organization of developing embryo using scale-invariant approach
, Article Theoretical Biology and Medical Modelling ; Volume 8, Issue 1 , 2011 ; 17424682 (ISSN) ; Tiraihi, M ; Tiraihi, T ; Sharif University of Technology
2011
Abstract
Background: Self-organization is a fundamental feature of living organisms at all hierarchical levels from molecule to organ. It has also been documented in developing embryos. Methods. In this study, a scale-invariant power law (SIPL) method has been used to study self-organization in developing embryos. The SIPL coefficient was calculated using a centro-axial skew symmetrical matrix (CSSM) generated by entering the components of the Cartesian coordinates; for each component, one CSSM was generated. A basic square matrix (BSM) was constructed and the determinant was calculated in order to estimate the SIPL coefficient. This was applied to developing C. elegans during early stages of...
A new model for the effect of grain size on the elastic modulus of nanocrystalline materials
, Article Materials Science- Poland ; Volume 27, Issue 1 , 2009 , Pages 279-285 ; 01371339 (ISSN) ; Sharif University of Technology
2009
Abstract
A new model is developed for the structure of nanocrystalline materials. Based on the developed model, a new approach for investigating the effect of grain size on the elastic moduli of nanocrystalline materials is introduced. The predictions of the model are strongly correlated with the experimental results reported in the existing literature
Accurate prediction of viscosity of mixed oils
, Article Petroleum Science and Technology ; Volume 39, Issue 9-10 , 2021 , Pages 351-361 ; 10916466 (ISSN) ; Mehrizadeh, M ; Zand, N ; Najafi Marghmaleki, A ; Sharif University of Technology
Bellwether Publishing, Ltd
2021
Abstract
Viscosity of mixed oil is an important parameter which is required in transportation and production processes of mixed crude oils. There is no universal and general model for prediction of viscosity of mixed oils at different conditions. Hence, developing simple, accurate and general models for prediction of mixed oil viscosity is of great importance. In this work three computer based models named MLP-NN, PSO-RBF and Hybrid-ANFIS were developed for prediction of viscosity of mixed oils. A number of 513 experimental data covering wide ranges of influencing parameters were utilized to develop the models. The accuracy of predictions of the developed models was examined by using different...
Multi-objective optimization of vehicle floor panel with a laminated structure based on V-shape development model and Taguchi-based grey relational analysis
, Article Structural and Multidisciplinary Optimization ; Volume 65, Issue 3 , 2022 ; 1615147X (ISSN) ; Khalkhali, A ; Ahmadi, A ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
In this paper, the V-shape development model approach for designing an automotive floor panel made by laminated structure is investigated to attain the best trade-off between the system and subsystem level requirements while improving the local and global performance of the vehicle. For this purpose, the bending and torsional stiffness of the body structure, as well as mass, strength, and vibration attenuation of the floor panel, are considered as design objectives at the system and subsystem levels. A multi-objective discrete optimization of a laminated configuration is performed using the Taguchi-based grey relational analysis. Material grades and thicknesses of the sandwich panel face...
The Evolution of the Idea of Progress in Western Thought and a Critical Look at It from an Islamic View
, M.Sc. Thesis Sharif University of Technology ; Taghavinia, Nima (Supervisor)
Abstract
“Progress” is among most frequently used terms in the past few centuries in public discussions, scientific communities as well as economic and sociopolitical policy making. This term has been used in our daily conversations so frequently that it seems to become an intrinsic goal for human beings. However, even a short survey of the introduced meanings of and suggested approaches to achieve “progress” during the last four centuries - since the term was first used- demonstrates that we are faced with a multitude of views from the different - and sometimes contradictory - schools of thoughts. Unfortunately, in recent decades, despite our national desire to “progress”, we have not yet thought...
Development of physical 3D model of maternal-fetal to study light interaction through tissue
, Article 2012 International Conference on Biomedical Engineering, ICoBE 2012 ; 2012 , Pages 557-561 ; 9781457719899 (ISBN) ; Gan, K. B ; Mohd Ali, M. A ; Zahedi, E ; Sharif University of Technology
2012
Abstract
The development of a synthetic model of a pregnant woman abdomen with amniotic fluid and a fetus is discussed comprehensively in this paper. The model is intended to be used for studying the light propagation through physical 3D model of pregnant woman in reflectance mode. To construct the model, reported dimension values of body curvature in 26 and 28 weeks of pregnant woman are being used as main references. Although slightly adjustments have been made to the body dimensions, the values are still within the range of reference values. Optical simulation has been performed in order to test the model capability. Given the reasonable computational time and encouraging preliminary results, the...
Bubble size distribution in two-dimensional gas-solid fluidized beds
, Article Industrial and Engineering Chemistry Research ; Volume 51, Issue 18 , 2012 , Pages 6571-6579 ; 08885885 (ISSN) ; Molaei Dehkordi, A ; Banaei, M ; Deen, N. G ; Van Sint Annaland, M ; Kuipers, J. A. M ; Sharif University of Technology
2012
Abstract
In this article, the digital image analysis (DIA) technique has been used to study the bubble size and bubble size distribution evolution in a pseudo-two-dimensional gas-solid fluidized bed. In addition, a numerical discrete bubble model (DBM) based on the bubble-bubble interactions was developed and the model predictions were compared with the experimental data. The developed model can predict the bubble size and bubble size distribution through the bed height and the lateral distribution of bubbles. Comparison between model predictions and the result of DIA measurements shows that bubble breakage has a significant effect on the bubble size distribution especially at heights far from the...
Modeling formation damage due to asphaltene deposition in the porous media
, Article Energy and Fuels ; Volume 25, Issue 2 , February , 2011 , Pages 753-761 ; 08870624 (ISSN) ; Tohidi, B ; Jamialahmadi, M ; Rashtchian, D ; Sharif University of Technology
2011
Abstract
Asphaltene deposition in a reservoir severely reduces the effective permeability and results in a reduction in oil production. The main term in asphaltene deposition modeling in the porous media is pore surface deposition. Previous models do not describe the effects of different parameters (i.e., concentration, velocity, and temperature) on the pore surface deposition term. We report the results of a series of experiments carried out to study the effects of the above parameters on the surface deposition term using an accurate thermal method. Based on these data, a new expression for the surface deposition term has been developed and implemented in asphaltene deposition modeling. The...
Delta-based regression testing: A formal framework towards model-driven regression testing
, Article Journal of Software: Evolution and Process ; Volume 27, Issue 12 , December , 2015 , Pages 913-952 ; 20477481 (ISSN) ; Mirian Hosseinabadi, S. H ; Sharif University of Technology
John Wiley and Sons Ltd
2015
Abstract
The increase in complexity and rate of technological changes in modern software development has led to a demand for systematic methods that raise the abstraction level for system maintenance and regression testing. Model-driven development (MDD) has promised to reduce extra coding efforts in software maintenance activities using traceable change management. The research described in this paper presents a Z-notation-based framework, called delta-based regression testing (DbRT), for formal modeling of regression testing in the context of MDD. The framework proposes to propagate the changes from a software specification to testing artifacts in order to preserve consistency after system...
An intelligent modeling approach for prediction of thermal conductivity of CO2
, Article Journal of Natural Gas Science and Engineering ; Volume 27 , November , 2015 , Pages 138-150 ; 18755100 (ISSN) ; Esmaili, S ; Rashid, S ; Suleymani, M ; Sharif University of Technology
Elsevier
2015
Abstract
In the design of a carbon dioxide capture and storage (CCS) process, the thermal conductivity of carbon dioxide is of special concern. Hence, it is quite important to search for a quick and accurate determination of thermal conductivity of CO2 for precise modeling and evaluation of such a process. To achieve this aim, a robust computing methodology, entitled least square support vector machine (LSSVM) modeling, which is coupled with an optimization approach, was used to model this transport property. The model was constructed and evaluated employing a comprehensive data bank (more than 550 data series) covering wide ranges of pressures and temperatures. Before constructing the model, outlier...
Caspian Sea negotiation support system
, Article World Environmental and Water Resources Congress 2010: Challenges of Change - Proceedings of the World Environmental and Water Resources Congress 2010, 16 May 2010 through 20 May 2010 ; 2010 , Pages 2694-2702 ; 9780784411148 (ISBN) ; Madani, K ; Gholizadeh, S ; Sharif University of Technology
Abstract
Caspian Sea is currently a subject of one of the world's most intractable disputes, involving five coastal states of Azerbaijan, Iran, Kazakhstan, Russia, and Turkmenistan. The conflict over the legal status of this multinational water body emerged after the collapse of the Soviet Union. Since then the parties have been negotiating without reaching an agreement on the ownerships of waters, and the oil and natural gas beneath them. Although different division methods have been suggested so far for sharing the Caspian Sea, the gains of the countries from sea area and valuable resources remain unclear as the proposed methods are either focused on the areal shares or on the oil and gas shares....
Towards a generic framework for model-driven engineering of software process lines
, Article ACM International Conference Proceeding Series, 31 August 2017 through 1 September 2017 ; Volume Part F130524 , 2017 ; 9781450348430 (ISBN) ; Ramsin, R ; Rysavy, O ; Vranic, V ; Sharif University of Technology
Abstract
Situational Method Engineering (SME)1approaches help construct bespoke software development processes according to the specifications of the project at hand, but they are time-consuming and costly. A Software Process Line (SPrL) tackles this problem by allowing software processes to be constructed for specific project situations through reusing core process assets. Model-Driven Development (MDD) has been used for automating SPrL Engineering (SPrLE); however, existing model-driven SPrLE methods are deficient as to their coverage of key MDD features. We propose a novel model-driven SPrLE approach that aims to address these shortcomings; it can be regarded as a framework that specifies the...
A precipitation-hardening model for non-isothermal ageing of Al-Mg-Si alloys
, Article Computational Materials Science ; Volume 45, Issue 2 , 2009 , Pages 385-387 ; 09270256 (ISSN) ; Bahrami, A ; Mousavi Anijdan, S. H ; Sharif University of Technology
2009
Abstract
An age-hardening model has been developed to predict the evolution of the hardness of Al-Mg-Si alloys during non-isothermal ageing before peak age. The concurrent precipitation and dissolution have been considered in the structural model. Then the structural model has been combined with strengthening model to predict the precipitation-hardening behavior of the alloy AA6061. The results indicate that the developed model can be used as a predictive tool to model the mechanical properties evolution of Al-Mg-Si alloys during non-isothermal heat treatment. © 2008 Elsevier B.V. All rights reserved
Developing new participation model of thermal generating units in flexible ramping market
, Article IET Generation, Transmission and Distribution ; Volume 13, Issue 11 , 2019 , Pages 2216-2225 ; 17518687 (ISSN) ; Moeini Aghtaie, M ; Fotuhi Firuzabad, M ; Sharif University of Technology
Institution of Engineering and Technology
2019
Abstract
Uncertainty and variability in the supply sector of renewable-penetrated power systems is becoming a new challenge for secure operation of these systems which if not responded properly may cause large amounts of load and supply curtailments. To meet this challenge, some ISOs recently have employed a new product named Flexible Ramping Product (FRP) into their markets which enhances the capability of the system to overcome such uncertainties by reserving additional ramp rates. In this regard, a new framework for implementing FRP in real-time market is proposed here. The proposed framework provides a proper opportunity for participation of thermal generating units in procuring FRP requirements....
A review on state-of-the-art applications of data-driven methods in desalination systems
, Article Desalination ; Volume 532 , 2022 ; 00119164 (ISSN) ; Faegh, M ; Khiadani, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
The substitution of conventional mathematical models with fast and accurate modeling tools can result in the further development of desalination technologies and tackling the need for freshwater. Due to the great capability of data-driven methods in analyzing complex systems, several attempts have been made to study various desalination systems using data-driven approaches. In this state-of-the-art review, the application of various artificial intelligence and design of experiment data-driven methods for analyzing different desalination technologies have been thoroughly investigated. According to the applications of data-driven methods in the field of desalination, the reviewed...
Impacts of plug-in hybrid electric vehicle uncertainty and grid unavailability on home load management
, Article 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012 - Conference Proceedings ; 2012 , p. 693-698 ; ISBN: 9781460000000 ; Safdarian, A ; Fotuhi-Firuzabad, M ; Aminifar, F ; Sharif University of Technology
Abstract
A massive focus has recently been made on demand response (DR) programs, aimed to the electricity price reduction, reliability improvement, and energy efficiency. Basically, DR programs are divided into twofold main categories, namely incentive-based programs and price- or time-based programs. The focus of this paper is on priced-based DR programs including consumer responses to the time differentiated pricing. Home load management (HLM) program is designed to control responsive appliances and charging/discharging cycles of plug-in hybrid electric vehicles (PHEVs) by the consumer. Uncertain parameters associated with PHEV, i.e. its departure/travelling time and energy consumption as well as...
Impacts of plug-in hybrid electric vehicle uncertainty and grid unavailability on home load management
, Article 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012, Venice, 18 May 2012 through 25 May 2012 ; 2012 , Pages 693-698 ; 9781457718281 (ISBN) ; Safdarian, A ; Fotuhi-Firuzabad, M ; Aminifar, F ; Sharif University of Technology
IEEE
2012
Abstract
A massive focus has recently been made on demand response (DR) programs, aimed to the electricity price reduction, reliability improvement, and energy efficiency. Basically, DR programs are divided into twofold main categories, namely incentive-based programs and price- or time-based programs. The focus of this paper is on priced-based DR programs including consumer responses to the time differentiated pricing. Home load management (HLM) program is designed to control responsive appliances and charging/discharging cycles of plug-in hybrid electric vehicles (PHEVs) by the consumer. Uncertain parameters associated with PHEV, i.e. its departure/travelling time and energy consumption as well as...
Discrete bubble model for prediction of bubble behavior in 3D fluidized beds
, Article Chemical Engineering and Technology ; Volume 35, Issue 5 , 2012 , Pages 929-936 ; 09307516 (ISSN) ; Ghafari, M ; Dehkordi, A. M ; Sharif University of Technology
2012
Abstract
A discrete bubble model has been developed taking into account multiple bubble-bubble interactions and a delayed coalescence method. The obtained simulation results were compared with experimental data reported in literature. The simulation results predicted by the developed model indicate clearly that the multiple interactions of bubbles lead to more reasonable results than those predicted by a binary interaction model. In addition, two types of interaction models were applied and predicted results were compared. The frequency of gas bubbles passing through the bed cross section versus bed height follows the same trend as the experimental data. A new modified discrete bubble model has been...