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A composition function model for software reconfiguration propagation in a network of systems
, Article 9th World Multi-Conference on Systemics, Cybernetics and Informatics, WMSCI 2005, Orlando, FL, 10 July 2005 through 13 July 2005 ; Volume 2 , 2005 , Pages 83-88 ; 980656054X (ISBN); 9789806560543 (ISBN) ; Niamanesh, M ; Jalili, R ; Sharif University of Technology
2005
Abstract
Reconfigurability in software has many advantages such as updating, bug fixing and adding new services. Dynamic reconfiguration is more useful for mission critical systems that need to change in run time. Reconfiguration of a system in network may result to reconfiguring its dependent systems, which we call reconfiguration propagation. In this paper, we present a model for reconfiguration propagation for systems in a network
Phase diagram of the XXZ ferrimagnetic spin-(1/2, 1) chain in the presence of transverse magnetic field
, Article Journal of Statistical Mechanics: Theory and Experiment ; Volume 2011, Issue 8 , August , 2011 ; 17425468 (ISSN) ; Abouie, J ; Asadzadeh, M. Z ; Rezai, M ; Sharif University of Technology
2011
Abstract
We investigate the phase diagram of an anisotropic ferrimagnetic spin-(1/2, 1) in the presence of a non-commuting (transverse) magnetic field. We find a magnetization plateau for the isotropic case while there is no plateau for the anisotropic ferrimagnet. The magnetization plateau can appear only when the Hamiltonian has the U(1) symmetry in the presence of the magnetic field. The anisotropic model is driven by the magnetic field from the Néel phase for low fields to the spin-flop phase for intermediate fields and then to the paramagnetic phase for high fields. We find the quantum critical points and their dependence on the anisotropy of the aforementioned field-induced quantum phase...
Investigation of the interactions between Melittin and the PLGA and PLA polymers: Molecular dynamic simulation and binding free energy calculation
, Article Materials Research Express ; Volume 6, Issue 5 , 2019 ; 20531591 (ISSN) ; Moosavi, A ; Sharif University of Technology
Institute of Physics Publishing
2019
Abstract
Nanobiotechnology is the application of nanotechnology in nanomedicine. Recently, the use of antimicrobial peptides as a substitute for antibiotics and anticancer drugs has attracted increasing attention. Therefore, the study of the structural behavior of these peptides such as Melittin and their interactions with biocompatible and biodegradable polymers is important. This study was performed to evaluate the critical interactions in the formation of the Melittin-polymers complexes. The aim of the current study was to investigate molecular mechanisms of Melittin encapsulation in biopolymers by molecular dynamics (MD) simulation. The results indicated that the basic residues of Melittin could...
Investigation of the interactions between Melittin and the PLGA and PLA polymers: Molecular dynamic simulation and binding free energy calculation
, Article Materials Research Express ; Volume 6, Issue 5 , 2019 ; 20531591 (ISSN) ; Moosavi, A ; Sharif University of Technology
Institute of Physics Publishing
2019
Abstract
Nanobiotechnology is the application of nanotechnology in nanomedicine. Recently, the use of antimicrobial peptides as a substitute for antibiotics and anticancer drugs has attracted increasing attention. Therefore, the study of the structural behavior of these peptides such as Melittin and their interactions with biocompatible and biodegradable polymers is important. This study was performed to evaluate the critical interactions in the formation of the Melittin-polymers complexes. The aim of the current study was to investigate molecular mechanisms of Melittin encapsulation in biopolymers by molecular dynamics (MD) simulation. The results indicated that the basic residues of Melittin could...
Experimental and Theoritical Study of Thermo-acoustic Effect in Carbon Nanotubes
, M.Sc. Thesis Sharif University of Technology ; Moosavi, Ali (Supervisor)
Abstract
Carbon Nanotube webs exhibit interesting properties when used as thermo-acoustic projectors. This work studies thermo-acoustic phenomena of these sound sources both in near and far field regions. Our three-dimensional simulation and experimental data show pressure waves are highly affected by dimensions of sound sources in near field due to interference effects. Although pressure amplitude increases with increasing frequencies, maximum pressure amplitude reached in lower frequencies may become larger than its maximum amount at higher frequencies because of interference effects. Measurement of different surface area sources shows generation of sound waves in far field is independent of...
Atomic scale interactions between RNA and DNA aptamers with the TNF- α protein
, Article BioMed Research International ; Volume 2021 , 2021 ; 23146133 (ISSN) ; Moosavi, A ; Alexandrakis, G ; Mofrad, M. R. K ; Sharif University of Technology
Hindawi Limited
2021
Abstract
Interest in the design and manufacture of RNA and DNA aptamers as apta-biosensors for the early diagnosis of blood infections and other inflammatory conditions has increased considerably in recent years. The practical utility of these aptamers depends on the detailed knowledge about the putative interactions with their target proteins. Therefore, understanding the aptamer-protein interactions at the atomic scale can offer significant insights into the optimal apta-biosensor design. In this study, we consider one RNA and one DNA aptamer that were previously used as apta-biosensors for detecting the infection biomarker protein TNF-α, as an example of a novel computational workflow for...
Numerical simulation of drag reduction in microgrooved substrates using lattice-boltzmann method
, Article Journal of Fluids Engineering, Transactions of the ASME ; Volume 141, Issue 7 , 2019 ; 00982202 (ISSN) ; Moosavi, A ; Etemadi, A ; Sharif University of Technology
American Society of Mechanical Engineers (ASME)
2019
Abstract
We study drag reduction of a uniform flow over a flat surface due to a series of rectangular microgrooves created on the surface. The results reveal that making grooves on the surface usually leads to the generation of secondary vortices inside the grooves that, in turn, decreases the friction drag force and increases the pressure drag force. By increasing the thickness of the grooves to the thickness of the obstacle, the pressure drag increases due to the enhancement of the generated vortices and the occurrence of separation phenomenon and the friction drag reduces due to a decrease of the velocity gradient on the surface. In addition, by increasing the grooves depth ratio, the pressure...
The effect of chitosan and PEG polymers on stabilization of GF-17 structure: A molecular dynamics study
, Article Carbohydrate Polymers ; Volume 237 , 2020 ; Moosavi, A ; Arghavani Hadi, J ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
We examine the interactions of chitosan and polyethylene glycol (PEG) with antimicrobial peptide GF-17 to identify a suitable carrier to improve the peptide drug delivery systems. To this end, the molecular dynamics simulations are used to determine the interactions of a typical antimicrobial peptide GF-17 with the chitosan and PEG polymers. The findings indicate the great potential of the peptide to maintain its secondary structure in the adjacent to chitosan polymers. During the interaction with chitosan polymers, the structure of the peptide has smaller fluctuations compared to the PEG polymers. Also, in the presence of both the polymers, the PEG polymers are situated closer to the...
Numerical Study of Anisotropic Ferrimagnetic Chain and Ladder with Density Matrix Renormalization Group Method
, M.Sc. Thesis Sharif University of Technology ; Langari, Abdollah (Supervisor)
Abstract
According to Haldane Conjecture Antiferromagnetic Heisenberg Spin Chain with integer spin has an energy gap, and exponential decay of correlation functions , while half integer spin chains are gapless with algebraic decay of correlation functions. A spin chain with two types of spins and Heisenberg interaction shows a mixture of both types of behavior. A ferrimagnet which is composed of two spins (S, s) has two bands of energy, the lower band is gapless and ferromagnetic property while the upper one is gapful with antiferromagnetic behavior. In the present work we have studied the anisotropic ferrimagnet in the presence of a transverse magnetic field. We have shown that the spin wave theory...
AFT regression-adjusted monitoring of reliability data in cascade processes
, Article Quality and Quantity ; Volume 47, Issue 6 , 2013 , Pages 3349-3362 ; 00335177 (ISSN) ; Aghaie, A ; Niaki, S. T. A ; Sharif University of Technology
2013
Abstract
Today's competitive market has witnessed a growing interest in improving the reliability of products in both service and industrial operations. A large number of monitoring schemes have been introduced to effectively control the reliability-related quality characteristics. These methods have focused on single-stage processes or considered quality variables which are independent. However, the main feature of multistage processes is the cascade property which needs to be justified for the sake of optimal process monitoring. The problem becomes complicated when the presence of censored observations is pronounced. Therefore, both the effects of influential covariates and censored data must be...
Discrete Time vs Continuous Time Stock-price Dynamics and Implications for Option Pricing
, M.Sc. Thesis Sharif University of Technology ; Alishahi, Kasra (Supervisor) ; Zamani, Shiva (Supervisor)
Abstract
In the present paper we construct stock price processes with the same marginal log- normal law as that of a geometric Brownian motion and also with the same transition density (and returns’ distributions) between any two instants in a given discrete-time grid. We then illustrate how option prices based on such processes differ from Black and Scholes’, in that option prices can be either arbitrarily close to the option intrinsic value or arbitrarily close to the underlying stock price. We also explain that this is due to the particular way one models the stock-price process in between the grid time instants which are relevant for trading
Simulation of Drag Reduction via Microgrooves Using Lattice Boltzmann Method
, M.Sc. Thesis Sharif University of Technology ; Moosavi, Ali (Supervisor) ; Arghavani, Jamal (Supervisor)
Abstract
Nowadays, the lattice Boltzmann method has been widely used by scientists and engineers as an alternative to conventional numerical solvers for the Naiver-Stokes equations. The drag force decrease on the surfaces in industrial applications special in transport industries has always been of special importance. In the current research, the effects of the drag decrease has been investigated by making some rectangular grooves on the millimeter and micrometer scale on a flat surface that has been under external laminar flow of a single-phase fluid with the uniform type. Making grooves on the surfaces usually lead to change the contact area from the solid-fluid to fluid-fluid in the grooves area....
Thermo acoustic study of carbon nanotubes in near and far field: Theory, simulation, and experiment
, Article Journal of Applied Physics ; Volume 117, Issue 9 , 2015 ; 00218979 (ISSN) ; Moosavi, A ; Huynh, C ; Saleki, O ; Sharif University of Technology
American Institute of Physics Inc
2015
Abstract
Carbon nanotube webs exhibit interesting properties when used as thermo-acoustic projectors. This work studies thermo-acoustic effect of these sound sources both in near and far field regions. Based on two alternative forms of the energy equation, we have developed a straightforward formula for calculation of pressure field, which is consistent with experimental data in far field. Also we have solved full 3-D governing equations using numerical methods. Our three-dimensional simulation and experimental data show pressure waves are highly affected by dimensions of sound sources in near field due to interference effects. However, generation of sound waves in far field is independent of...
The application of proportional hazards and frailty models to multistage processes surveillance
, Article International Journal of Advanced Manufacturing Technology ; Volume 74, Issue 1-4 , September , 2014 , Pages 461-470 ; ISSN: 02683768 ; Aghaie, A ; Shahriari, H ; Niaki, S. T. A ; Sharif University of Technology
2014
Abstract
Monitoring industrial and service processes with the purpose of improving the product reliability has been largely addressed in the literature. The surveillance procedures have been proposed with the concentration on single-stage processes with independent quality characteristics. However, the cascade property in multistage processes entails specific monitoring methods which take into account the dependency structure among quality variables in successive stages of a process. This is referred to as regression-adjustment that justifies the heterogeneity in the study population and thus leads to optimal monitoring of multistage processes. In general, it is not straightforward to adjust a...
Improving reliability in multistage processes with autocorrelated observations
, Article Quality Technology and Quantitative Management ; Volume 12, Issue 2 , 2015 , Pages 143-157 ; 16843703 (ISSN) ; Aghaie, A ; Shahriari, H ; Akhavan Niaki, S. T ; Sharif University of Technology
2015
Abstract
Multistage process surveillance is considered to effectively improve the product reliability in manufacturing or service operations. To this end, the process output is commonly inspected under specific conditions and the values of the reliability-related quality characteristic are measured. However, in some cases, the observations from the process output are autocorrelated. This brings about the situation where the use of existing monitoring schemes is futile. Therefore, a class of survival analysis regression models called the proportional hazards (PH) model has been modified to justify the effect of cascade property in line with the autocorrelation issue. Subsequently, three monitoring...
Development of a nano biosensor for anti-gliadin detection for Celiac disease based on suspension microarrays
, Article Biomedical Physics and Engineering Express ; Volume 6, Issue 5 , August , 2020 ; Rabiee, M ; Rostami Nejad, M ; Aghamohammadi, E ; Asadzadeh Aghdaei, H ; Zali, M. R ; Rabiee, N ; Fatahi, Y ; Bagherzadeh, M ; Webster, T. J ; Sharif University of Technology
IOP Publishing Ltd
2020
Abstract
Celiac disease is an autoimmune disorder represented by the ingestion of the gluten protein usually found in wheat, barley and rye. To date, ELISA has been the most accurate method for determining the presence of anti-gliadin, which is cumbersome, expensive (compared to a suspension microarray technique), and requires extensive sample preparation. In this study, in order to establish a more accurate assay to identify gliadin at lower concentrations, optical nano biosensors using an indirect immunoassay method for gliadin detection was designed and fabricated. For this, polycaprolactone (PCL) nano- to micro-beads were fabricated as a platform for the gliadin antigen which were optimized and...
The association of clinicopathological characterizations of colorectal cancer with membrane-bound mucins genes and LncRNAs
, Article Pathology Research and Practice ; Volume 233 , 2022 ; 03440338 (ISSN) ; Entezari, M ; Rejali, L ; Nazemalhosseini-Mojarad, E ; Maghsoudloo, M ; Asadzadeh Aghdaei, H ; Zali, M. R ; Hushmandi, K ; Rabiee, N ; Makvandi, P ; Ashrafizadeh, M ; Hashemi, M ; Sharif University of Technology
Elsevier GmbH
2022
Abstract
Background: Colorectal cancer (CRC) is one of the most common malignancies in the world and has a high mortality rate. It is believed that dysfunction in the expression of mucins and aberrant expression of some lncRNAs are associated with the occurrence and development of CRC. Therefore, the aim of the present study was to investigate the expression of MUC15, MUC16, MUC20, PCAT1, CCAT1 and HOTAIR genes in colorectal cancer and its relationship with clinicopathological variables. Materials and methods: This research was prospective case-control study. Tumors from CRC patients were collected from the Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran. RNA...
Facile deposition of porous fluorine doped tin oxide by Dr. Blade method for capacitive applications
, Article Ceramics International ; 2020 ; Tajabadi, F ; Dastan, D ; Sangpour, P ; Shi, Z ; Taghavinia, N ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Three-dimensional macroporous fluorine-doped tin oxide (p-FTO) films were successfully deposited using commercial ink of FTO powder and SnCl2 salt via Dr. Blade method. Various features of p-FTO thin films were studied as a function of the ink composition and sintering temperature. The morphological studies corroborated formation of porous, uniform, and crack-free FTO films after annealing at 300 °C for 10 min in air. X-ray diffraction pattern demonstrated development of highly crystalline FTO films. The lowest sheet resistance of 47 Ω/□ was obtained for the p-FTO film with a thickness of 21 μm. The capacitance of thin p-FTO films was investigated using a three-electrode system and the...
Facile deposition of porous fluorine doped tin oxide by Dr. blade method for capacitive applications
, Article Ceramics International ; Volume 47, Issue 4 , 2021 , Pages 5487-5494 ; 02728842 (ISSN) ; Tajabadi, F ; Dastan, D ; Sangpour, P ; Shi, Z ; Taghavinia, N ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Three-dimensional macroporous fluorine-doped tin oxide (p-FTO) films were successfully deposited using commercial ink of FTO powder and SnCl2 salt via Dr. Blade method. Various features of p-FTO thin films were studied as a function of the ink composition and sintering temperature. The morphological studies corroborated formation of porous, uniform, and crack-free FTO films after annealing at 300 °C for 10 min in air. X-ray diffraction pattern demonstrated development of highly crystalline FTO films. The lowest sheet resistance of 47 Ω/□ was obtained for the p-FTO film with a thickness of 21 μm. The capacitance of thin p-FTO films was investigated using a three-electrode system and the...
Earthquake vulnerability assessment for urban areas using an ann and hybrid swot-qspm model
, Article Remote Sensing ; Volume 13, Issue 22 , 2021 ; 20724292 (ISSN) ; Zabihi, H ; Rezaie, F ; Asadzadeh, A ; Wolf, I. D ; Langat, P. K ; Khosravi, I ; Beiranvand Pour, A ; Nataj, M. M ; Pradhan, B ; Sharif University of Technology
MDPI
2021
Abstract
Tabriz city in NW Iran is a seismic-prone province with recurring devastating earthquakes that have resulted in heavy casualties and damages. This research developed a new computational framework to investigate four main dimensions of vulnerability (environmental, social, economic and physical). An Artificial Neural Network (ANN) Model and a SWOT-Quantitative Strategic Planning Matrix (QSPM) were applied. Firstly, a literature review was performed to explore indicators with significant impact on aforementioned dimensions of vulnerability to earthquakes. Next, the twenty identified indicators were analyzed in ArcGIS, a geographic information system (GIS) software, to map earthquake...