Loading...
Search for:
ranjbar-koleibi--amir
0.117 seconds
Total 1437 records
Microfluidics Desulfurization of Hydrocarbons Components
, M.Sc. Thesis Sharif University of Technology ; Mohammadi, Aliasghar (Supervisor) ; Kazemeini, Mohammad (Supervisor)
Abstract
Microfluidic is a science and technology in which they study the behavior of fluids, control them and design devices or systems with dimensions of tens to hundreds of micrometers. The technology has the ability to design and manufacture macro-scale and micro-scale equipment, such as micro-pumps, micro-valves, micro-filters, micro-mixers, micro-reactors, and other equipment. The benefits of this technology include the use of low sample size, low waste of energy, low power consumption, short response time, high system performance, portability and performance of several operating phases in a compressed piece such as production, isolation and analysis. Also, the very low amount of chemicals and...
Distinguishing DDoS Attacks from Flash Crowds
, M.Sc. Thesis Sharif University of Technology ; Jahangir, Amir Hossein (Supervisor)
Abstract
Distributed Denial of Service attacks are threats that target availability of network resources. One feature of this type of attacks is high volume of traffic or service request from huge number of illegitimate attackers that organize botnets together, which cause performance decrease of network. Nowadays, distinguishing huge number of legitimate users during Flash Crowd is one of the most challenging issues for network security experts. Most of proposed methods so far, did not have enough performance or were only applicable in short term, due to increasing attackers’ knowledge in mimicking legitimate users behavior. Methods based on extracting statistic features usually, have better...
Rigidity of Minimal Submanifolds in Hyperbolic Space
, M.Sc. Thesis Sharif University of Technology ; Ranjbar Motlagh, Alireza (Supervisor)
Abstract
We prove that if an n-dimensional complete minimal submanifold M in hyperbolic space has sufficiently small total scalar curvature then M has only one end. We also prove that for such M there exist no nontrivial L^2 harmonic 1-forms on M
Peer-to-Peer Energy Sharing Optmization Among Smart Energy Hubs in an Integrated Heat-Electricity Network
, M.Sc. Thesis Sharif University of Technology ; Ranjbar, Ali Mohammad (Supervisor)
Abstract
With deployment of distributed generation such as photovoltaic (PV) and active prosumers along with demand response (DR) ability, new fields are being created for energy markets and they are moving towards a consumer-centric way. Peer-to-Peer (P2P) network is one of the top research focuses which many studies have been conducted recently. The P2P network is based on multi bilateral agreements between Prosumers that help each other to manage and balance the supply and demand of energy between each other. In this thesis, two important structures of P2P network, which are called community-based and fully-decentrilized, respectively based on MILP (mixed integer linear programing) and ADMM...
Electricity price forecasting using artificial neural network
, Article 2006 International Conference on Power Electronics, Drives and Energy Systems, PEDES '06, New Delhi, 12 December 2006 through 15 December 2006 ; 2006 ; 078039772X (ISBN); 9780780397729 (ISBN) ; Soleymani, S ; Sadati, N ; Ranjbar, A. M ; Sharif University of Technology
2006
Abstract
In the restructured power markets, price of electricity has been the key of all activities in the power market. Accurately and efficiently forecasting electricity price becomes more and more important. Therefore in this paper, an Artificial Neural Network (ANN) model is designed for short term price forecasting of electricity in the environment of restructured power market. The proposed ANN model is a four-layered perceptron neural network, which consists of, input layer, two hidden layers and output layer. Instead of conventional back propagation (BP) method, Levenberg- Marquardt BP (LMBP) method has been used for the ANN training to increase the speed of convergence. Matlab is used for...
A general model for I/O system theory, Proceedings of AIMC31 [electronic resource]
, Article Iranian Journal of Fuzzy Systems ; 2006, Volume 3, Issue 2, Page 1-19 ; Hashem, Amir ; Sharif University of TechnologyA decentralized energy management framework for energy hubs in dynamic pricing markets
, Article IEEE Transactions on Smart Grid ; 2017 ; 19493053 (ISSN) ; Toulabi, M ; Ranjbar, S ; Moeini Aghtaie, M ; Ranjbar, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2017
Abstract
With increasing the presence of co-and tri-generating units, energy hub operators are encouraged to optimally schedule the available energy resources in an economic way. This scheduling needs to be run in an online manner due to the uncertainties in energy prices and demands. In this paper, the real-time scheduling problem of energy hubs is formulated in a dynamic pricing market. The energy hubs interaction is modeled as an exact potential game to optimize each energy hub’s payments to the electricity and gas utilities, as well as the customers’ satisfaction from energy consumption. The potential game approach enables us to study the existence and uniqueness of the Nash equilibrium (NE) and...
A decentralized energy management framework for energy hubs in dynamic pricing markets
, Article IEEE Transactions on Smart Grid ; Volume 9, Issue 6 , 2018 , Pages 6780-6792 ; 19493053 (ISSN) ; Toulabi, M ; Ranjbar, S ; Moeini Aghtaie, M ; Ranjbar, A. M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
With increasing the presence of co- and tri-generating units, energy hub operators are encouraged to optimally schedule the available energy resources in an economic way. This scheduling needs to be run in an online manner due to the uncertainties in energy prices and demands. In this paper, the real-time scheduling problem of energy hubs is formulated in a dynamic pricing market. The energy hubs interaction is modeled as an exact potential game to optimize each energy hub's payments to the electricity and gas utilities, as well as the customers' satisfaction from energy consumption. The potential game approach enables us to study the existence and uniqueness of the Nash equilibrium and to...
A note on isometries of Lipschitz spaces
, Article Journal of Mathematical Analysis and Applications ; Vol. 411, Issue. 2 , 2014 , Pages 555-558 ; ISSN: 0022247X ; Sharif University of Technology
2014
Abstract
The main purpose of this article is to generalize a recent result about isometries of Lipschitz spaces. Botelho, Fleming and Jamison [2] described surjective linear isometries between vector-valued Lipschitz spaces under certain conditions. In this article, we extend the main result of [2] by removing the quasi-sub-reflexivity condition from Banach spaces
An integral type characterization of constant functions on metric-measure spaces
, Article Journal of Mathematical Analysis and Applications ; Volume 385, Issue 1 , January , 2012 , Pages 194-201 ; 0022247X (ISSN) ; Sharif University of Technology
2012
Abstract
The main purpose of this article is to generalize a characterization of constant functions to the context of metric-measure spaces. In fact, we approximate a measurable function, in terms of a certain integrability condition, by Lipschitz functions. Then, similar to Brezis (2002) [2], we establish a necessary and sufficient condition in order that any measurable function which satisfies an integrability condition to be constant a.e. Also, we provide a different proof for the main result of Pietruska-Pałuba (2004) [7] in the setting of Dirichlet forms
Generalized rademacher-stepanov type theorem and applications
, Article Zeitschrift fur Analysis und ihre Anwendung ; Volume 28, Issue 3 , 2009 , Pages 249-275 ; 02322064 (ISSN) ; Sharif University of Technology
2009
Abstract
The main purpose of this article is to generalize a theorem of Stepanov which provides a necessary and sufficient condition for almost everywhere differentiability of functions over Euclidean spaces. We state and prove an Lp-type generalization of the Stepanov theorem and then we extend it to the context of Orlicz spaces. Then, this generalized Rademacher-Stepanov type theorem is applied to the Sobolev and bounded variation maps with values into a metric space. It is shown that several generalized differentiability type theorems are valid for the Sobolev maps from a Lipschitz manifold into a metric space. As a byproduct, it is shown that the Sobolev spaces of Korevaar-Schoen and Reshetnyak...
A non-existence theorem for isometric immersions
, Article Journal of Geometry and Physics ; Volume 59, Issue 3 , 2009 , Pages 263-266 ; 03930440 (ISSN) ; Sharif University of Technology
2009
Abstract
Let f : M {long rightwards arrow} over(M, -) be an isometric immersion between Riemannian manifolds. For certain conditions on M and over(M, -) in terms of curvatures and external diameter, we extend the non-embedding theorem of Chern and Kuiper to the isometric immersions of non-compact manifolds. Also, our results generalize and improve the main results of Jorge and Koutroufiotis [L. Jorge, D. Koutroufiotis, An estimate for the curvature of bounded submanifolds, Amer. J. Math. 103 (4) (1981) 711-725] and Veeravalli [A. R. Veeravalli, A sharp lower bound for the Ricci curvature of bounded hypersurfaces in space forms, Bull. Austral. Math. Soc. 62 (1) (2000) 165-170]. © 2008 Elsevier B.V....
An integral type characterization of lipschitz functions over metric-measure spaces
, Article Journal of Mathematical Analysis and Applications ; Volume 479, Issue 2 , 2019 , Pages 1708-1714 ; 0022247X (ISSN) ; Sharif University of Technology
Academic Press Inc
2019
Abstract
The main purpose of this article is to generalize a characterization of Lipschitz functions in the context of metric-measure spaces. The results are established in the class of metric-measure spaces which satisfy a strong version of the doubling (Bishop-Gromov regularity) condition. Indeed, we establish a necessary and sufficient condition in order that any measurable function which satisfies an integrability condition to be essentially Lipschitzian. © 2019 Elsevier Inc
Isometries of Lipschitz type function spaces
, Article Mathematische Nachrichten ; Volume 291, Issue 11-12 , 2018 , Pages 1899-1907 ; 0025584X (ISSN) ; Sharif University of Technology
Wiley-VCH Verlag
2018
Abstract
In this article, we describe isometries over the Lipschitz spaces under certain conditions. Indeed, we provide a unified proof for the main results of and in a more general setting. Finally, we extend our results for some other functions spaces like the space of vector-valued little Lipschitz maps and pointwise Lipschitz maps. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
A remark on the bourgain-brezis-mironescu characterization of constant functions
, Article Houston Journal of Mathematics ; Volume 46, Issue 1 , 2020 , Pages 113-115 ; Sharif University of Technology
University of Houston
2020
Abstract
The purpose of this paper is to describe a simple proof for a result originally presented by H. Brezis in [B], with roots in J. Bourgain, H. Brezis and P. Mironescu [BBM]. © 2020 University of Houston
A remark on isometries of absolutely continuous spaces
, Article Journal of Function Spaces ; Volume 2020 , 2020 ; Sharif University of Technology
Hindawi Limited
2020
Abstract
The purpose of this article is to study the isometries between vector-valued absolutely continuous function spaces, over compact subsets of the real line. Indeed, under certain conditions, it is shown that such isometries can be represented as a weighted composition operator. © 2020 Alireza Ranjbar-Motlagh
Generalizations of the Liouville theorem
, Article Differential Geometry and its Application ; Volume 26, Issue 3 , 2008 , Pages 339-345 ; 09262245 (ISSN) ; Sharif University of Technology
2008
Abstract
The purpose of this paper is to generalize the Liouville theorem for functions which are defined on the complete Riemannian manifolds. Then, we apply it to the isometric immersions between complete Riemannian manifolds in order to obtain an estimate for the size of the image of immersions in terms of the supremum of the length of their mean curvature vector in a quite general setting. The proofs are based on the Calabi's generalization of maximum principle for functions which are not necessarily differentiable. © 2007 Elsevier B.V. All rights reserved
Isometries between spaces of vector-valued differentiable functions
, Article Journal of Function Spaces ; Volume 2021 , 2021 ; 23148896 (ISSN) ; Sharif University of Technology
Hindawi Limited
2021
Abstract
This article characterizes the isometries between spaces of all differentiable functions from a compact interval of the real line into a strictly convex Banach space. © 2021 Alireza Ranjbar-Motlagh
A note on the Poincaré inequality
, Article Studia Mathematica ; Volume 154, Issue 1 , 2003 , Pages 1-11 ; 00393223 (ISSN) ; Sharif University of Technology
Instytut Matematyczny
2003
Abstract
The Poincaré inequality is extended to uniformly doubling metric-measure spaces which satisfy a version of the triangle comparison property. The proof is based on a generalization of the change of variables formula
Besov type function spaces defined on metric-measure spaces
, Article Journal of Mathematical Analysis and Applications ; Volume 505, Issue 2 , 2022 ; 0022247X (ISSN) ; Sharif University of Technology
Academic Press Inc
2022
Abstract
The purpose of this article is to study the Besov type function spaces for maps which are defined on abstract metric-measure spaces. We extend some of the embedding theorems of the classical Besov spaces to the setting of abstract spaces. © 2021 Elsevier Inc