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The capacity of a class of linear deterministic relay networks
, Article ISITA/ISSSTA 2010 - 2010 International Symposium on Information Theory and Its Applications, 17 October 2010 through 20 October 2010, Taichung ; 2010 , Pages 720-725 ; 9781424460175 (ISBN) ; Aref, M. R ; Sharif University of Technology
2010
Abstract
In this paper, we investigate optimal coding strategies for a class of linear deterministic relay networks. The network under study is a relay network, with one source, one destination, and two relay nodes. Additionally, there is a disturbing source of signals that causes interference with the information signals received by the relay nodes. Our model captures the effect of the interference of message signals and disturbing signals on a single relay network, or the interference of signals from multiple relay networks with each other in the linear deterministic framework. For several ranges of the network parameters we find upper bounds on the maximum achievable source-destination rate in the...
Nonlocal Gravity and It’s Local Limit in Cosmology
, M.Sc. Thesis Sharif University of Technology ; Baghram, Shant (Supervisor)
Abstract
The theory of nonlocal gravity is a classical modification of Einstein’s general relativity, that explores nonlocal effects of gravity by putting aside the locality postulate, or the assumption that the non-inertial observer is equivalent to an inertial observer with the same speed at each instant of time. In this research we explore the local limit of this theory, or in other words, we consider nonlocality with only a short-term memory, with the goal of calculating the effects of nonlocality on cosmology in mind. We calculate these effects that are formulated inspired by the effects of materials in electrodynamics, on a homogenous universe in the local limit. We also reproduce the theory of...
Incommensurate order fractional optimal control: Application to treatment of psychiatric disorders
, Article 2013 21st Iranian Conference on Electrical Engineering ; May , 2013 , Page(s): 1 - 5 ; 9781467356343 (ISBN) ; Yazdanpanah, M. J ; Tavazoei, M. S ; Sharif University of Technology
2013
Abstract
The main point of this paper is to present a time domain strategy for drug dosage to treat psychiatric disorders. A time domain model of emotion is obtained from an extension of a recently developed fractional nonlinear dynamic model of happiness. First, the Fractional Optimal Control law for incommensurate multi state systems is obtained. It will be then applied as an optimal drug administration procedure in the line of psychiatric disorders treatment. Results of this paper show that optimal control scheme is a proper approach to face the difficulties of analysis and control the incommensurate systems. It can be also clearly seen from the simulation results that this approach is very...
Formulation and numerical solution for fractional order time optimal control problem using pontryagin's minimum principle
, Article IFAC-PapersOnLine ; Volume 50, Issue 1 , 2017 , Pages 9224-9229 ; 24058963 (ISSN) ; Yazdanpanah, M. J ; Tavazoei, M. S ; Sharif University of Technology
2017
Abstract
The main purpose of this paper is to use variational calculus and Pontryagin's minimum principle to propose a solution scheme for time optimal control problem stated on the fractional systems defined in the sense of Caputo. After deriving the necessary optimality conditions, a novel numerical solution is used to solve the problem. Afterwards, a simple case study shows the effectiveness of the proposed method. © 2017
Related-key impossible differential cryptanalysis of full-round HIGHT
, Article ICETE 2013 - 10th International Joint Conference on E-Business and Telecommunications; SECRYPT 2013 - 10th International Conference on Security and Cryptography, Proceedings, Reykjavik ; 2013 , Pages: 537-542 ; 9789898565730 (ISBN) ; Chafjiri, S. B ; Tabatabaei, S. A. H ; Sharif University of Technology
2013
Abstract
The HIGHT algorithm is a 64-bit block cipher with 128-bit key length, at CHES'06 as a lightweight cryptographic algorithm. In this paper, a new related-key impossible differential attack on the full-round algorithm is introduced. Our cryptanalysis requires time complexity of 2127.276 HIGHT evaluations which is slightly faster than exhaustive search attack. This is the first related-key impossible differential cryptanalysis on the full-round HIGHT block cipher. Copyright
Poly (vinyl alcohol)/graphene oxide nanocomposite films and hydrogels prepared by gamma ray
, Article Plastics, Rubber and Composites ; Volume 48, Issue 2 , 2019 , Pages 42-47 ; 14658011 (ISSN) ; Dadbin, S ; Tabatabaei, M ; Sharif University of Technology
Taylor and Francis Ltd
2019
Abstract
Poly (vinyl alcohol)/graphene oxide (PVA/GO) gamma irradiated nanocomposite films and hydrogels were prepared. In composite films, GO was initially irradiated by gamma ray in order to improve interactions between GO and PVA. The film containing 1 wt-% GO was very strong where tensile modulus and tensile yield strength were 45 and 115% higher than those of pure PVA. In the second set of experiments PVA/GO hydrogels were made by irradiating PVA/GO suspensions by gamma ray at various doses. It was an interesting finding that GO increased the gel portion of hydrogels through contribution of H-bonds between PVA and GO. The hydrogels prepared at 20 kGy had remarkable water swelling ratio that...
Experimental investigation and theoretical prediction of extrudate swell using conformational rheological models
, Article International Polymer Processing ; Volume 27, Issue 4 , 2012 , Pages 478-485 ; 0930777X (ISSN) ; Ahmad Ramazani, S. A ; Amoli, H. H ; Kamyabi, A ; Sharif University of Technology
Hanser
2012
Abstract
In this study the extrudate swell of polymer solutions is estimated using the microstructure of polymer molecules. When a flexible polymer chain goes through a narrow die shear stress exerting on the chain will cause the polymer chain to be stretched along the flow direction. After emerging from die all external stresses vanish immediately and the chains tend to recover their previous state due to elastic recovery. This phenomenon will results in a gradual increase in extrudate diameter and this is used as the key idea for estimating swell ratio. A Giesekus based conformational model was used in order to predict polymer chains microstructure everywhere in the domain. The resulting PDE set...
High-Efficiency Inertial Separation of Microparticles Using Elevated Columned Reservoirs and Vortex Technique for Lab-on-a-Chip Applications
, Article ACS Omega ; Volume 8, Issue 31 , 2023 , Pages 28628-28639 ; 24701343 (ISSN) ; Hajghassem, H ; Kalantar, M ; Karimi, A ; Tabatabaei Asl, M ; Hosseini, S ; Badieirostami, M ; Sharif University of Technology
American Chemical Society
2023
Abstract
The discovery of circulating tumor cells (CTCs) has envisioned an excellent outlook for cancer diagnosis and prognosis. Among numerous efforts proposed for CTCs isolation, vortex separation is a well-known method for capturing CTCs from blood due to its applicability, low sample volume requirement, and ability to retain cell viability. It is a label-free, passive, low-cost, and automated method, making it an ideal solution for lab-on-a-chip applications. The previous designs that employed vortex technology have shown reaching high throughput and 70% separation efficiency although it was after three processing cycles which are not desired. Inspired by our earlier design, in this work, we...
Gap tuning and effective electron correlation energy in amorphous silicon: A first principles density functional theory-based molecular dynamics study
, Article Computational Materials Science ; Volume 102 , May , 2015 , Pages 110-118 ; 09270256 (ISSN) ; Shodja, H. M ; Esfarjani, K ; Sharif University of Technology
Elsevier
2015
Abstract
First principles density functional theory (DFT)-based molecular dynamics (MD) is used to study some physical and electronic properties of amorphous silicon (a-Si) samples, as-quenched and annealed containing dangling and floating bonds (pertinent to the threefold- and fivefold-coordinated defects, respectively) as well as distorted tetrahedral bonds. Surprisingly, except for the work of Pantelides (1986) who gave a rough estimate for the effective electron correlation energy, Ueff of a floating bond on the fivefold-coordinated Si, to date, there are no theoretical studies in the literature for the calculation of Ueff pertinent to this type of defect. In this work, Ueff for each type of...
The role of strain on the quantum spin hall effect and band inversion in stanene
, Article Computational Condensed Matter ; Volume 10 , 2017 , Pages 1-9 ; 23522143 (ISSN) ; Shodja, H. M ; Ojaghnezhad, F ; Sharif University of Technology
Elsevier B.V
2017
Abstract
Examination of the role of strain on the quantum spin hall (QSH) effect and band inversion for the monolayer of tin, stanene, is of interest. To this end, several uniaxial and biaxial strain loadings along the armchair (AC)- and zigzag (ZZ)-directions are applied using first principles calculations based on density functional theory (DFT). We observe QSH insulator as well as semi-metallic property associated with the strained stanene. © 2017 Elsevier B.V
Synergy between hemagglutinin 2 (HA2) subunit of influenza fusogenic membrane glycoprotein and oncolytic Newcastle disease virus suppressed tumor growth and further enhanced by Immune checkpoint PD-1 blockade
, Article Cancer Cell International ; Volume 20, Issue 1 , August , 2020 ; Ebrahimzadeh, M. S ; Abdolalipour, E ; Yazdi, M ; Hosseini Ravandi, H ; Ghaemi, A ; Sharif University of Technology
BioMed Central Ltd
2020
Abstract
Background: Newcastle disease virus (NDV) has shown noticeable oncolytic properties, especially against cervical cancer. However, in order to improve the spread rate and oncotoxicity of the virus, employment of other therapeutic reagents would be helpful. It has been shown that some viral fusogenic membrane glycoproteins (FMGs) could facilitate viral propagation and increase the infection rate of tumor cells by oncolytic viruses. Additionally, immune checkpoint blockade has widely been investigated for its anti-tumor effects against several types of cancers. Here, we investigated for the first time whether the incorporation of influenza hemagglutinin-2 (HA2) FMG could improve the oncolytic...
On dynamic models of human emotion
, Article ICEE 2012 - 20th Iranian Conference on Electrical Engineering, 15 May 2012 through 17 May 2012 ; May , 2012 , Pages 874-878 ; 9781467311489 (ISBN) ; Yazdanpanah, M. J ; Tavazoei, M. S ; Karimian, A ; Sharif University of Technology
2012
Abstract
This paper contains analysis and simulation of recent dynamic models, describing human emotion. The pharmacological discussions lead to a new model of drug taking, which also have a better performance for description of psychological and psychiatric phenomena. Studying the effects of the order of fractional model, obtains an advantage of the fractional order model over the integer order one
Prognostic of rolling element bearings based on early-stage developing faults
, Article International Journal of COMADEM ; Volume 23, Issue 1 , February , 2020 , Pages 55-60 ; Behzad, M ; Ghodrati, B ; Khodaygan, S
COMADEM International
2020
Abstract
Rolling-element bearing (REB) failure is one of the general damages in rotating machinery. In this manner, the correct prediction of remaining useful life (RUL) of REB is a crucial challenge to move forward the unwavering quality of the machines. One of the main difficulties in implementing data-driven methods for RUL prediction is to choose proper features that represent real damage progression. In this article, by using the outcomes of frequency analysis through the Envelope method, the initiated/existed defects on the ball bearings are identified. Also, new features based on developing faults of ball bearings is recommended to estimate RUL. Early-stage faults in ball bearings usually...
Removal of chlorophenolic derivatives by soil isolated ascomycete of Paraconiothyrium variabile and studying the role of its extracellular laccase
, Article Journal of Hazardous Materials ; Volume 209-210 , 2012 , Pages 199-203 ; 03043894 (ISSN) ; Movahednia, M. M ; Yaghmaei, S ; Tabatabaei Sameni, M ; Rastegar, H ; Sadighi, A ; Faramarzi, M. A ; Sharif University of Technology
2012
Abstract
The ability of Paraconiothyrium variabile, a laccase producing ascomycete recently isolated from soil, was studied to eliminate chlorophenol derivatives in submerged culture medium. Among the tested compounds, ρ-chlorophenol (ρ-CP) and pentachlorophenol (PCP) were found to have minimum and maximum toxic effects, respectively, on the growth of the microorganism and at the same time high and low bioelimination percentages. The fungal strain was able to remove 86% of ρ-CP (with initial concentration of 40mgl -1) and 56% of 2,4-dichlorophenol (2,4-DCP; with same concentration as ρ-CP) after 9 days of incubation while no elimination was observed in the presence of 2,4,6-trichlorophenol...
The effects of postural difficulty conditions on variability of joint kinematic patterns during sit to stand task in normals and patients with non-specific chronic low back pain
, Article 2011 1st Middle East Conference on Biomedical Engineering, MECBME 2011, 21 February 2011 through 24 February 2011, Sharjah ; 2011 , Pages 300-303 ; 9781424470006 (ISBN) ; Negahban, H ; Yazdi, M. J. S ; Salehi, R ; Mehravar, M ; Parnianpour, M ; Sharif University of Technology
2011
Abstract
Sit to stand (STS) is one of the most important activities of daily living that is shown to be affected in low back pain (LBP) patients. It requires a fundamental coordination action among all segments (DOFs) of the body in order to control important performance variables such as body's center of mass (CM) within base of support (BOS). In this study, possible differences in joint coordination and variability patterns between chronic LBP and healthy control subjects were investigated during STS task. Eleven adults with nonspecific chronic LBP and 12 healthy controls were recruited in the study. The participants performed the task in 3 exerimental conditions including: rigid surface, open eyes...
Robots’ cooperation for finding a target in streets
, Article 1st IFIP WG 1.8 International Conference on Topics in Theoretical Computer Science, 26 August 2015 through 28 August 2015 ; Volume 9541 , 2016 , Pages 30-43 ; 03029743 (ISSN) ; 9783319286778 (ISBN) ; Ghodsi, M ; Tabatabaei, A
Springer Verlag
2016
Abstract
We study the problem of finding a target t from a start point s in street environments with the cooperation of two robots which have a minimal sensing capability; that is, robots do not know any information about the workspace including information on distances, edges, coordinates, angles etc. They just can detect the discontinuities in the visibility region of their location. The robots can detect target point t as soon as it enters their visibility region and have communication peripherals to send messages to each other. Our aim is to minimize the length of the path passed by the robots. We propose an online algorithm for robots such that they move in the workspace and find the target....
Enhanced thermal stability and biocompatibility of gold nanorods by graphene oxide
, Article Plasmonics ; 2017 , Pages 1-10 ; 15571955 (ISSN) ; Hatamie, S ; Tabatabaei, S. N ; Salimi, M ; Saber, R ; Sharif University of Technology
2017
Abstract
In the present study, the effect of nanosized graphene oxide layer on thermal stability and biocompatibility of gold nanorods has been examined. The graphene oxide-wrapped gold nanorods were prepared by electrostatic interaction between negatively charged graphene oxide and positively charged nanorods. The resulting nanohybrids were then heated at different time intervals to 95 °C in a water bath to assess the effect of heat on the rods morphology. The structural changes in gold nanorods were monitored via UV-Vis spectroscopy measurements and transmission electron microscopy images. In similar experiments, the graphene oxide used to wrap gold nanorods was reduced by ascorbic acid in a 95 °C...
Enhanced thermal stability and biocompatibility of gold nanorods by graphene oxide
, Article Plasmonics ; Volume 13, Issue 5 , 2018 , Pages 1585-1594 ; 15571955 (ISSN) ; Hatamie, S ; Tabatabaei, S. N ; Salimi, M ; Saber, R ; Sharif University of Technology
2018
Abstract
In the present study, the effect of nanosized graphene oxide layer on thermal stability and biocompatibility of gold nanorods has been examined. The graphene oxide-wrapped gold nanorods were prepared by electrostatic interaction between negatively charged graphene oxide and positively charged nanorods. The resulting nanohybrids were then heated at different time intervals to 95 °C in a water bath to assess the effect of heat on the rods morphology. The structural changes in gold nanorods were monitored via UV-Vis spectroscopy measurements and transmission electron microscopy images. In similar experiments, the graphene oxide used to wrap gold nanorods was reduced by ascorbic acid in a 95 °C...
Quantum corrections in the drift-diffusion model
, Article Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers ; Volume 46, Issue 11 , 2007 , Pages 7247-7250 ; 00214922 (ISSN) ; Faez, R ; Sadoghi Yazdi, H ; Sharif University of Technology
2007
Abstract
Based on the solution of the Wigner-Boltzmann (WB) equation, quantum correction in the drift-diffusion (DD) model is proposed. The new model, which is a form of the quantum DD model, can show quantum phenomena such as tunneling and quantum repulsion. To evaluate the proposed model, potential barrier and potential wells are simulated. Simulation results show the electron tunneling through and repulsion from the potential barrier. © 2007 The Japan Society of Applied Physics
Elastic moduli tensors, ideal strength, and morphology of stanene based on an enhanced continuum model and first principles
, Article Mechanics of Materials ; Volume 110 , 2017 , Pages 1-15 ; 01676636 (ISSN) ; Ojaghnezhad, F ; Etehadieh, A ; Tabatabaei, M ; Sharif University of Technology
Elsevier B.V
2017
Abstract
The present work aims to provide an accurate description of the tensile behavior of the planar as well as low-buckled stanene and to capture their ideal strength in armchair (AC)- and zigzag (ZZ)-directions. For an accurate description of anisotropic response of such hyperelastic materials as stanene, consideration of a highly nonlinear constitutive model in which up to the fourth power of strains is incorporated is inevitable. By utilizing first principles calculations based on density functional theory (DFT), the second, third, fourth, and fifth order elastic moduli tensors corresponding to both planar and low-buckled states are obtained. Moreover, the morphology of the free-standing...