Loading...
Search for: component
0.01 seconds
Total 1110 records

    Analysis of design goals of cryptography algorithms based on different components

    , Article Indonesian Journal of Electrical Engineering and Computer Science ; Volume 23, Issue 1 , 2021 , Pages 540-548 ; 25024752 (ISSN) Molk, A.M.N.G ; Aref, M. R ; Khorshiddoust, R. R ; Sharif University of Technology
    Institute of Advanced Engineering and Science  2021
    Abstract
    Cryptography algorithms are a fundamental part of a cryptographic system that is designed and implemented to increase information security. They are the center of attention of experts in the information technology domains. Although the cryptography algorithms are implemented to attain the goals such as confidentially, integrity, and authenticity of designing, but other matters that must be noticed by designers include speed, resource consumption, reliability, flexibility, usage type, and so on. For the useful allocation of hardware, software, and human resources, it is important to identify the role of each of the factors influencing the design of cryptographic algorithms to invest in the... 

    Optimal sensor placement for source localization in nlos conditions

    , Article 26th Iranian Conference on Electrical Engineering, ICEE 2018, 8 May 2018 through 10 May 2018 ; 2018 , Pages 435-439 ; 9781538649169 (ISBN) Juybari, S. M. S ; Behnia, F ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2018
    Abstract
    The problem of sensor placement for passive source localization under the non-line of sight signal propagation is considered in this paper. To this end, first we derive the Cramer-Rao lower bound for the time of arrival based source localization under non-line of sight conditions. Then, the optimal arrangement of sensors to achieve this lower bound is obtained in the two important cases with all of the receivers being non line of sight ones in the first case and a combination of line of sight and non-line of sight receivers in the 2nd case. © 2018 IEEE  

    Using formal methods in component based software development

    , Article 2008 International Conference on Systems, Computing Sciences and Software Engineering, SCSS 2008, Part of the International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering, CISSE 2008, 5 December 2013 through 13 December 2013 ; 2010 , Pages 429-432 ; 9789048136575 (ISBN) Shirali Shahreza, S ; Shirali Shahreza, M ; Sharif University of Technology
    2010
    Abstract
    Reusing the programs which have already been developed can shorten the production time and reduce costs and expenses. One of the important issues in software reuse is finding a program or a program component in a program library which has been already developed and using it in the new program. In view of precision and automation that formal methods can provide, we can use formal methods in retrieval appropriate components from the software libraries. In this paper, some of the works done in the field of retrieval of the components from the libraries by the help of formal methods have been surveyed and reviewed  

    A new method for shot classification in soccer sports video based on SVM classifier

    , Article Proceedings of the IEEE Southwest Symposium on Image Analysis and Interpretation ; 2012 , Pages 109-112 ; 9781467318303 (ISBN) Bagheri Khaligh, A ; Raziperchikolaei, R ; Moghaddam, M. E ; Sharif University of Technology
    2012
    Abstract
    Sport video shot classification is a basic step in the sport video processing. For many purposes such as event detection and summarization, shot classification is needed for content filtering. In this paper, we present a new method for soccer video shot classification. At first, in-field and out-of-field frames are separated. In in-field frames three features based on number of connected components and shirt color percent in vertical and horizontal strips are extracted. The features are all new and showed excellent discrimination in the feature space. These features are given to SVM for classifying long, medium and close-up shots. One of the advantages of our method is that, close-ups can be... 

    Voice conversion using nonlinear principal component analysis

    , Article 2007 IEEE Symposium on Computational Intelligence in Image and Signal Processing, CIISP 2007, Honolulu, HI, 1 April 2007 through 5 April 2007 ; 2007 , Pages 336-339 ; 1424407079 (ISBN); 9781424407071 (ISBN) Makki, B ; Seyed salehi, S. A ; Sadati, N ; Noori Hosseini, M ; Sharif University of Technology
    2007
    Abstract
    In the last decades, much attention has been paid to the design of multi-speaker voice conversion. In this work, a new method for voice conversion (VC) using nonlinear principal component analysis (NLPCA) is presented. The principal components are extracted and transformed by a feed-forward neural network which is trained by combination of Genetic Algorithm (GA) and Back-Propagation (BP). Common pre- and post-processing approaches are applied to increase the quality of the synthesized speech. The results indicate that the proposed method can be considered as a step towards multi-speaker Voice conversion. © 2007 IEEE  

    Government interventions and the size of the informal economy. The case of Iran (1971-2007)

    , Article Journal of Economic Policy Reform ; Vol. 17, issue. 1 , 2014 , pp. 71-90 ; ISSN: 17487870 Khandan, A ; Nili, M ; Sharif University of Technology
    Abstract
    Literature on the informal economy can mainly be divided into two different contrasting theories. According to the dual labor market theory (DLM), which considers the informal economy as a spare sector providing jobs for formally unemployed resources, unpleasant economic situations force people to act informally. Legalists, on the other hand, blame government interventions such as minimum wages or price control policies for pushing rent-seeking firms toward the shadows. This study using an Error-correction Multi-Indicators Multi-Causes (EMIMIC) model, a systematic method consisting of structural and measurement equations, shows that these two theories are complementary rather than... 

    Synthesis of a new class of tetronic acid derivatives: A one-pot three-component condensation reaction between isoquinoline or pyridine and dialkyl acetylenedicarboxylate with tetronic acid

    , Article Monatshefte fur Chemie ; Volume 144, Issue 7 , 2013 , Pages 1051-1055 ; 00269247 (ISSN) Rezayan, A. H ; Sabahi, H ; Rahmati, A ; Maleki, A ; Kheirjou, S ; Sharif University of Technology
    2013
    Abstract
    Reaction of the zwitterions generated from isoquinoline or pyridine and dialkyl acetylenedicarboxylate with tetronic acid leads to 1,2- dihydroisoquinoline or 1,2-dihydropyridine tetronic acid derivatives without using any catalyst or activation at room temperature  

    An efficient run-based method for connected component labeling

    , Article 9th Iranian Conference on Machine Vision and Image Processing, 18 November 2015 through 19 November 2015 ; Volume 2016-February , 2015 , Pages 100-104 ; 21666776 (ISSN) ; 9781467385398 (ISBN) Mohammadi Gharasuie, M ; Gaffari, A ; Sharif University of Technology
    IEEE Computer Society 
    Abstract
    This paper presents a new run-based algorithm for labeling connected components in a binary image. The algorithm removes assumption on all border pixels of image are background. Also it does not use merging operation for resolving label equivalences among provisional labels (sets), but it uses post processing stage. The post processing stage reduces complexity for resolving label equivalency. During the first scan, provisional labels are assigned to the connected components. After the first scan, the post processing is done to resolve label equivalency. The smallest provisional label among all provisional labels that are assigned to a connected component is considered as a representative... 

    A Pool-based active learning method for improving farsi-english machine translation system

    , Article 2012 6th International Symposium on Telecommunications, IST 2012 ; 978-146732073-3 Bakhshaei, Somayeh ; Sharif University of Technology
    Abstract
    In this paper we try to alleviate the problem of scares resources for developing Farsi-English Statistical Machine Translation system (SMT). It is done by applying Active Learning (AL) idea to choose more informative sentences to be translated by a human and then be added to the base-line corpus. While using the human translations is worthless in compare to the other approaches of corpus gathering (like automatic approaches), it is more costly too. So, in this way we can improve the translation system with less cost. This is done in intricate to human translator. Applying Active learning idea to a SMT system, changes it to a system which can improve its based-line corpus by asking for the... 

    Application of the genetic algorithm to calculate the interaction parameters for multiphase and multicomponent systems

    , Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 26, Issue 3 , 2007 , Pages 89-102 ; 10219986 (ISSN) Rashtchian, D ; Ovaysi, S ; Taghikhani, V ; Ghotbi, C ; Sharif University of Technology
    2007
    Abstract
    A method based on the Genetic Algorithm (GA) was developed to study the phase behavior of multicomponent and multiphase systems. Upon application of the GA to the thermodynamic models which are commonly used to study the VLE, VLLE and LLE phase equilibria, the physically meaningful values for the Binary Interaction Parameters (BIP) of the models were obtained. Using the method proposed in this work the activity coefficients for components at infinite dilution, obtained from the local composition based models, can be accurately predicted comparing to the experimental data available in the literature. In this work, a Global Optimization Procedure (GOP) based on the GA was developed to obtain... 

    Sparse ICA via cluster-wise PCA

    , Article Neurocomputing ; Volume 69, Issue 13-15 , 2006 , Pages 1458-1466 ; 09252312 (ISSN) Babaie Zadeh, M ; Jutten, C ; Mansour, A ; Sharif University of Technology
    2006
    Abstract
    In this paper, it is shown that independent component analysis (ICA) of sparse signals (sparse ICA) can be seen as a cluster-wise principal component analysis (PCA). Consequently, Sparse ICA may be done by a combination of a clustering algorithm and PCA. For the clustering part, we use, in this paper, an algorithm inspired from K-means. The final algorithm is easy to implement for any number of sources. Experimental results points out the good performance of the method, whose the main restriction is to request an exponential growing of the sample number as the number of sources increases. © 2006 Elsevier B.V. All rights reserved  

    A facile one-pot, four-component synthesis of (Z)-isomer of rhodanine-oxindole derivatives under environmentally benevolent conditions

    , Article Synthetic Communications ; 2021 ; 00397911 (ISSN) Matloubi Moghaddam, F ; Aghamiri, B ; Jalalinik, M ; Sharif University of Technology
    Taylor and Francis Ltd  2021
    Abstract
    Herein, an efficient and sustainable one-pot, four-component access to rhodanine-oxindole derivatives is achieved by a reaction between primary amines, carbon disulfide, ethyl chloroacetate, and cyano-substituted alkenyl oxindoles. The reaction was conducted without any harsh conditions as well as exhausting workup in polyethylene glycol (PEG) as a green solvent at room temperature and delivered rhodanine-oxindole products in high yield. This publication is the first easy protocol to be reported for the rapid construction of new rhodanine-oxindole derivatives at room temperature without harsh conditions and via multicomponent reaction. © 2021 Taylor & Francis Group, LLC  

    Environmental impact assessment modeling in an urban man-made lake using fuzzy logic

    , Article Journal of Food, Agriculture and Environment ; Volume 7, Issue 3-4 , 2009 , Pages 811-814 ; 14590255 (ISSN) Jassbi, J ; Nouri, J ; Abbaspour, M ; Varshosaz, K ; Jafarzadeh, N ; Sharif University of Technology
    2009
    Abstract
    Environmental impact assessment essentially depends on diverse closely connected components and variables. For this purpose, identification of the whole components is fundamentally required. This study aims to investigate environmental impact assessment of an urban man-made lake in the western part of Tehran, based on recognition of affecting components and their reciprocal effects. Since the components are not constant during the time, thus throughout the environmental impact assessment modeling study, dynamism of the relation between the components should be considered. Regarding insufficiency and uncertainty of information, an analytical method, based on expert's opinion can be applied.... 

    A methodology for analyzing the transient availability and survivability of a system with the standby components in two cases: The identical components and the non-identical components

    , Article Journal of Applied Sciences ; Volume 8, Issue 22 , 2008 , Pages 4105-4112 ; 18125654 (ISSN) Amiri, M ; Ghassemi Tari, F ; Mohtashami, A ; Sadaghiani, J. S ; Sharif University of Technology
    2008
    Abstract
    In this study, a method for transient analysis of availability and survivability of a system with the standby components is presented. The availability and survivability of the standby systems is evaluated in two cases, the standby systems with the identical components and the standby systems with the non-identical components. In this study the Markov models, eigen vectors and eigen values for analyzing the transient availability and survivability of the system are employed. The method is implemented through an algorithm which is tested in MATLAB (matrix laboratory) programming environment. The new method enjoys a stronger mathematical foundation and more flexibility for analyzing the... 

    Fast sparse representation based on smoothed ℓ0norm

    , Article 7th International Conference on Independent Component Analysis (ICA) and Source Separation, ICA 2007, London, 9 September 2007 through 12 September 2007 ; Volume 4666 LNCS , 2007 , Pages 389-396 ; 03029743 (ISSN); 9783540744931 (ISBN) Mohimani, G. H ; Babaie Zadeh, M ; Jutten, C ; Sharif University of Technology
    Springer Verlag  2007
    Abstract
    In this paper, a new algorithm for Sparse Component Analysis (SCA) or atomic decomposition on over-complete dictionaries is presented. The algorithm is essentially a method for obtaining sufficiently sparse solutions of underdetermined systems of linear equations. The solution obtained by the proposed algorithm is compared with the minimum ℓ1-norm solution achieved by Linear Programming (LP). It is experimentally shown that the proposed algorithm is about two orders of magnitude faster than the state-of-the-art ℓ1-magic, while providing the same (or better) accuracy. © Springer-Verlag Berlin Heidelberg 2007  

    Estimating the mixing matrix in sparse component analysis based on converting a multiple dominant to a single dominant problem

    , Article 7th International Conference on Independent Component Analysis (ICA) and Source Separation, ICA 2007, London, 9 September 2007 through 12 September 2007 ; Volume 4666 LNCS , 2007 , Pages 397-405 ; 03029743 (ISSN); 9783540744931 (ISBN) Noorshams, N ; Babaie Zadeh, M ; Jutten, C ; Sharif University of Technology
    Springer Verlag  2007
    Abstract
    We propose a new method for estimating the mixing matrix, A, in the linear model x(t) = As(t),t = 1,...,T, for the problem of underdetermined Sparse Component Analysis (SCA). Contrary to most previous algorithms, there can be more than one dominant source at each instant (we call it a "multiple dominant" problem). The main idea is to convert the multiple dominant problem to a series of single dominant problems, which may be solved by well-known methods. Each of these single dominant problems results in the determination of some columns of A. This results in a huge decrease in computations, which lets us to solve higher dimension problems that were not possible before. © Springer-Verlag... 

    Generalized slab method analysis of radial forging with a general curved shape die

    , Article 8th Biennial ASME Conference on Engineering Systems Design and Analysis, ESDA2006, Torino, 4 July 2006 through 7 July 2006 ; Volume 2006 , 2006 ; 0791837793 (ISBN); 9780791837795 (ISBN) Afrasiab, H ; Movahhedy, M. R ; Sharif University of Technology
    American Society of Mechanical Engineers  2006
    Abstract
    Radial forging is an open die forging process used for reducing the diameters of shafts, tubes, stepped shafts and axels, and for creating internal profiles in tubes. Among parameters affecting process variables, the die geometry is of fundamental importance and greatly influences variables such as forging load, stress distribution on the dies, metal flow during deformation, and surface finish of the forged product. In this paper a generalized slab method analysis of radial forging process is presented which can handle this process with curved shape dies. Results for dies with various curves are presented and it is shown that the analysis reduces to that of Lahoti and Altan [2] when the die... 

    Ictal EEG signal denoising by combination of a semi-blind source separation method and multiscale PCA

    , Article 2016 23rd Iranian Conference on Biomedical Engineering and 2016 1st International Iranian Conference on Biomedical Engineering, ICBME 2016, 23 November 2016 through 25 November 2016 ; 2017 , Pages 226-231 ; 9781509034529 (ISBN) Pouranbarani, E ; Hajipour Sardoubie, S ; Shamsollahi, M. B ; Sharif University of Technology
    Abstract
    Contamination of ictal Electroencephalogram (EEG) signals by muscle artifacts is one of the critical issues related to clinically diagnosing seizure. Over the past decade, several methods have been proposed in time, frequency and time-frequency domain to accurately isolate ictal EEG activities from artifacts. Among denoising approaches Canonical Correlation Analysis (CCA) and Independent Component Analysis (ICA) are widely used. Denoising based on Generalized EigenValue Decomposition (GEVD) is one of the Semi-Blind Source Separation (SBSS) methods which has been recently proposed. In the GEVD-based method, a couple of time-frequency covariance matrices are used. These time-frequency (TF)... 

    Simple and rapid determination of effective Murphree component efficiencies for operating absorbers, strippers and distillation columns filled with any type of trays

    , Article Separation and Purification Technology ; Volume 139 , January , 2015 , Pages 104-108 ; 13835866 (ISSN) Sadeghifar, H ; Sharif University of Technology
    Elsevier  2015
    Abstract
    Estimating efficiency of an operating column has to be distinguished from that of a column being designed. This crucial point has been totally overlooked in the literature. All the methods and models available for predicting the Murphree efficiencies of tray columns have been developed for the design case. They generate their own mass and heat transfer rates and empirical parameters rather than produce true transfer rates by using operating column (realistic) data, especially the specifications of outlet streams. In addition, most of these methods are limited in application and insufficient in accuracy, especially if applied outside the range of conditions under which they were formulated.... 

    Structure and texture image inpainting

    , Article Proceedings of the 2010 International Conference on Signal and Image Processing, ICSIP 2010, 15 December 2010 through 17 December 2010 ; 2010 , Pages 119-124 ; 9781424485949 (ISBN) Hesabi, S ; Jamzad, M ; Mahdavi Amiri, N ; Sharif University of Technology
    Abstract
    Inpainting refers to the task of filling in the missing or damaged regions of an image in an undetectable manner. We have an image to be reconstructed in a user-defined region. We use a fast decomposition method to obtain two components of the image, namely structure and texture. Reconstruction of each component is performed separately. The missing information in the structure component is reconstructed using a structure inpainting algorithm, while the texture component is repaired by a texture synthesis technique. To obtain the inpainted image, the two reconstructed components are composed together. Taking advantage of both the structure inpainting methods and texture synthesis techniques,...