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Total 45 records
Self-assembled one-pot synthesis of red luminescent CdS:Mn/Mn(OH)2 nanoparticles
, Article Journal of Luminescence ; Volume 128, Issue 12 , December , 2008 , Pages 1980-1984 ; 00222313 (ISSN) ; Taghavinia, N ; Iraji Zad, A ; Mahdavi, S. M ; Sharif University of Technology
2008
Abstract
We report a novel method of growing red luminescent (635 nm) Mn-doped CdS (CdS:Mn) nanoparticles capped by an inorganic shell of Mn(OH)2. CdSO4, Na2S2O3 and Mn(NO3)2 were used as the precursors, and thioglycerol (C3H8O2S) was employed as the capping agent and also the catalyst of the reaction. Using these materials resulted in very slow rate of the reaction and particles growth. The self-assembled one-pot process was performed at pH of 8 and Mn:Cd ratio of 10, and took about 10 days for completion. CdS:Mn nanoparticles are slowly formed in the first day of the process; however, the luminescence is weak. After 7 days, the solution turns white turbid through the formation of additional...
Reduction of sensor population in a camera sensor network
, Article 2008 International Symposium on Telecommunications, IST 2008, Tehran, 27 August 2008 through 28 August 2008 ; 2008 , Pages 349-353 ; 9781424427512 (ISBN) ; Samavi, S ; Ashori, M ; Karimi, N ; Fotohi, M ; Kasiri, K ; Sharif University of Technology
2008
Abstract
The problem of surveillance for intrusion detection in a camera sensor network is addressed in this paper. In order to save limited resources, a sensing task should involve just the right number of sensors. For a wide enough coverage area random and uniform distribution can be applied. We propose a novel method which allows reduction of number of sensors and guarantees a desired surveillance against aerial intrusion. Enhancement of the method is also offered to further reduce the number of sensors and improve the performance. ©2008 IEEE
Online velocity optimization of robotic swarm flocking using particle swarm optimization (PSO) method
, Article 2009 6th International Symposium on Mechatronics and its Applications ; 2009, Article number 5164776 , 2009 , p. 5164776- ; ISBN: 978-142443481-7 ; Etemadi, S ; Honarvar, M ; Alasty, A ; Boroushaki, M ; Vossoughi, G ; Sharif University of Technology
Abstract
In this paper, the agent velocity in robotic swarm was determined by using particle swarm optimization (PSO) to maximize the robotic swarm coordination velocity. A swarm as supposed here is homogenous and includes at least two members. Motion and behavior of swarm members are mostly result of two different phenomena: interactive mutual forces and influence of the agent. Interactive mutual forces comprise both attraction and repulsion. To be more realistic the field of the swarm members' view is not infinity. So influence of the coordinator agent on the robotic swarm would be local. The objective here is to guide the robotic swarm with maximum possible velocity. According to equation motion...
A novel method to find appropriate ε for DBSCAN
, Article Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 24 March 2010 through 26 March 2010 ; Volume 5990 LNAI, Issue PART 1 , 2010 , Pages 93-102 ; 03029743 (ISSN) ; 3642121446 (ISBN) ; Habibi, J ; Hassas Yeganeh, S ; Sharif University of Technology
2010
Abstract
Clustering is one of the most useful methods of data mining, in which a set of real or abstract objects are categorized into clusters. The DBSCAN clustering method, one of the most famous density based clustering methods, categorizes points in dense areas into same clusters. In DBSCAN a point is said to be dense if the ε-radius circular area around it contains at least MinPts points. To find such dense areas, region queries are fired. Two points are defined as density connected if the distance between them is less than ε and at least one of them is dense. Finally, density connected parts of the data set extracted as clusters. The significant issue of such a method is that its parameters (ε...
Constructing and decoding GWBE codes using Kronecker products
, Article IEEE Communications Letters ; Volume 14, Issue 1 , 2010 , Pages 1-3 ; 10897798 (ISSN) ; Faraji, M ; Marvasti, F ; Sharif University of Technology
2010
Abstract
In this letter, we introduce a novel method for constructing large size Generalized Welch Bound Equality (GWBE) matrices. This method can also be used for the construction of large WBE matrices. The advantage of this method is its low complexity for constructing large size matrices and low computational complexity using Maximum Likelihood (ML) decoders for a subclass of these codes. © 2010 IEEE
Implementation and optimization of wavelet modulation in additive gaussian channels
, Article 11th International Conference on Advanced Communication Technology, ICACT 2009, Phoenix Park, 15 February 2009 through 18 February 2009 ; Volume 3 , 2009 , Pages 1940-1943 ; 17389445 (ISSN); 9788955191387 (ISBN) ; Nassirpour, S ; Shamsollahi, M. B ; IEEE Communications Society, IEEE ComSoc ; Sharif University of Technology
2009
Abstract
In this paper, we investigate the implementation of wavelet modulation (WM) in a digital communication system and propose novel methods to improve its performance. We will put particular focus on the structure of an optimal detector in AWGN channels and address two main methods for inserting the samples of the message signal in different frequency layers. Finally, computer based algorithms are described in order to implement and optimize receivers and transmitters
Polymeric carriers for enhanced delivery of probiotics
, Article Advanced Drug Delivery Reviews ; Volume 161-162 , 2020 , Pages 1-21 ; Pourjavadi, A ; Licht, T. R ; Boisen, A ; Ajalloueian, F ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Probiotics are live microorganisms (usually bacteria), which are defined by their ability to confer health benefits to the host, if administered adequately. Probiotics are not only used as health supplements but have also been applied in various attempts to prevent and treat gastrointestinal (GI) and non-gastrointestinal diseases such as diarrhea, colon cancer, obesity, diabetes, and inflammation. One of the challenges in the use of probiotics is putative loss of viability by the time of administration. It can be due to procedures that the probiotic products go through during fabrication, storage, or administration. Biocompatible and biodegradable polymers with specific moieties or pH/enzyme...
Extended two-dimensional PCA for efficient face representation and recognition
, Article 2008 IEEE 4th International Conference on Intelligent Computer Communication and Processing, ICCP 2008, Cluj-Napoca, 28 August 2008 through 30 August 2008 ; October , 2008 , Pages 295-298 ; 9781424426737 (ISBN) ; Manzuri Shalmani, M. T ; Khademi, M ; Sharif University of Technology
2008
Abstract
In this paper a novel method called Extended Two-Dimensional PCA (E2DPCA) is proposed which is an extension to the original 2DPCA. We state that the covariance matrix of 2DPCA is equivalent to the average of the main diagonal of the covariance matrix of PCA. This implies that 2DPCA eliminates some covariance information that can be useful for recognition. E2DPCA instead of just using the main diagonal considers a radius of r diagonals around it and expands the averaging so as to include the covariance information within those diagonals. The parameter r unifies PCA and 2DPCA. r=1 produces the covariance of 2DPCA, r=n that of PCA. Hence, by controlling r it is possible to control the...
2D-Bert: Two dimensional burst error recovery technique
, Article 2007 15th International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2007, Split - Dubrovnik, 27 September 2007 through 29 September 2007 ; 2007 , Pages 411-415 ; 9789536114931 (ISBN) ; Kialashaki, H ; Lakdashti, A ; Sharif University of Technology
2007
Abstract
Compressed images such as JPEG when transmitted over communication channels are susceptible to channel noise and/or erasure, which causes losses of blocks of pixels or macroblocks. Recovery of a large block in an image is a difficult task. In this paper we propose a novel method that addresses this problem and can exactly recover a lost block. Moreover, the proposed algorithm is fast enough to be implemented in real time. Simulation results show that our method is faster than previous methods proposed in the literature with less distortion
Uncalibrated multi-view multiple humans association and 3D pose estimation by adversarial learning
, Article Multimedia Tools and Applications ; Volume 80, Issue 2 , 2021 , Pages 2461-2488 ; 13807501 (ISSN) ; Kasaei, S ; Sanaei, E ; Sharif University of Technology
Springer
2021
Abstract
Multiple human 3D pose estimation is a useful but challenging task in computer vison applications. The ambiguities in estimation of 2D and 3D poses of multiple persons can be verified by using multi-view frames, in which the occluded or self-occluded body parts of some persons might be visible in other camera views. But, when cameras are moving and uncalibrated, estimating the association of multiple human body parts among different camera views is a challenging task. This paper presents novel methods for multiple human 3D pose estimation and pose association in multi-view camera frames in an uncalibrated camera setup using an adversarial learning framework. The generator is a 3D pose...
Prediction of flooding in a pulsed packed column for continuous pertraction of dysprosium by an emulsion liquid membrane
, Article Chemical Engineering and Processing - Process Intensification ; Volume 169 , 2021 ; 02552701 (ISSN) ; Bastani, D ; Safdari, J ; Raji, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
For the first time, Dysprosium was extracted by the novel method of emulsion liquid membrane in a pulsed packed column in a continuous process. Emulsion liquid membrane (ELM) was comprised of D2EHPA (di-2-ethylhexylphosphoric acid) as carrier and Span 80 (Polysorbate 80) as the surfactant in kerosene as the diluent and nitric acid as internal phase. In this work, the packed column was characterized from a hydrodynamic point of view including flooding condition and holdup at flooding points. Operational parameters affecting the flooding points, such as pulsation intensity and flow rate of continuous and dispersed phases have been studied. It was found that increase in pulsation intensity up...
A low complexity architecture for the cell search applied to the LTE systems
, Article 2012 19th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2012, 9 December 2012 through 12 December 2012 ; Dec , 2012 , Pages 300-303 ; 9781467312615 (ISBN) ; Sharifan, G ; Amini, Y ; Shabany, M ; Sharif University of Technology
2012
Abstract
Cell search is a crucial process in the synchronization procedure for the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system. In this paper, a high-speed, low-complexity and reliable architecture is proposed for both steps of cell search: sector ID and cell ID group detection. For the sector ID detection, two novel methods, sign-bit reduction and wise resource sharing, are proposed. In addition, for the cell ID group detection, we proposed an algorithm based on the Maximum Likelihood Sequence Detection (MLSD) called 'sign-bit MLSD'. Simulations show that the proposed methods result in more than 90% reduction in area compared to the state-of-the-art. We designed and...
The simultaneous determination of archie's parameters by application of modified genetic algorithm and hdp methods: A comparison with current methods via two case studies
, Article Petroleum Science and Technology ; Volume 30, Issue 1 , Mar , 2011 , Pages 54-63 ; 10916466 (ISSN) ; Najafi, I ; Najafi, A ; Ghazanfari, M. H ; Sharif University of Technology
2011
Abstract
Although different procedures have been proposed to calculate the parameters of Archie's (1942) equation, most of them suffer from lack of accuracy because these are not solved simultaneously In this article, by applying two novel methods, a modified genetic algorithm (MGA) and homogeneous distribution of parameters (HDP), the above-mentioned unknown parameters were determined simultaneously. Furthermore, for two case studies using two data sets from Permian Glerito and Permian Clearfork reservoirs, a comparison is made between other methods (e.g., traditional graphical method and SmnaM; Frailey et al., 2001) and the proposed methods that demonstrated the greater accuracy of the two newly...
Analysis of distribution of thrust, torque and efficiency of a constant chord, constant pitch C.R.P. fan by H.E.S. method
, Article World Academy of Science, Engineering and Technology ; Volume 79 , 2011 , Pages 546-550 ; 2010376X (ISSN) ; Nikpoorparizi, P ; Shahrooz, M ; Sharif University of Technology
2011
Abstract
For the first time since 1940 and presentation of theodorson's theory, distribution of thrust, torque and efficiency along the blade of a counter rotating propeller axial fan was studied with a novel method in this research. A constant chord, constant pitch symmetric fan was investigated with Reynolds Stress Turbulence method in this project and H.E.S. method was utilized to obtain distribution profiles from C.F.D. tests outcome. C.F.D. test results were validated by estimation from Playlic's analytical method. Final results proved ability of H.E.S. method to obtain distribution profiles from C.F.D test results and demonstrated interesting facts about effects of solidity and differences...
A modified saliency detection for content-aware image resizing using cellular automata
, Article Proceedings of the 2010 International Conference on Signal and Image Processing, ICSIP 2010, 15 December 2010 through 17 December 2010 ; 2010 , Pages 175-179 ; 9781424485949 (ISBN) ; Jamzad, M ; Sharif University of Technology
Abstract
It is often required that image resizing be done brightly in order to preserve important content. Some image resizing techniques like scaling and cropping fail to identify and protect important objects, or they produce non-photorealistic images. But content aware image resizing schemes aim to change image aspect ratios while preserving visually outstanding features. In this paper, a novel method for content aware resizing is presented. Seam carving, an effective image resizing algorithm, fails to protect important objects in images, when either the energy content of the objects are low with respect to their surroundings, or, the number of seams removed are very large. Using saliency map as...
Effect of electron irradiation on dye and printability of polypropylene (PP) fabrics: A novel method for decoration of PP fabrics
, Article Journal of the Textile Institute ; Volume 101, Issue 11 , Sep , 2010 , Pages 988-995 ; 00405000 (ISSN) ; Shahidi, S ; Ghoranneviss, M ; Wiener, J ; Anvari, A ; Sharif University of Technology
2010
Abstract
Polypropylene (PP) has a very low value of the surface free energy (approximately 20-25 mJ m-2). And thus, has very weak hydrophilic properties and doesn't have any affinity to any dyestuffs, such as cationic or anionic dyes. In this study, we covered some parts of PP fabrics by mask, and then irradiated them by electrons with different energies. After electron irradiation, the samples were dyed by cationic dyestuff. The result showed that, electron irradiated parts could be dyed easily and the fabric could be printed and decorated simply. The treated surfaces were investigated by scanning electron microscope (SEM), reflective spectrophotometery, and Fourier transform infrared spectroscopy...
A new bigram-PLSA language model for speech recognition
, Article Eurasip Journal on Advances in Signal Processing ; Volume 2010 , July , 2010 ; 16876172 (ISSN) ; Sameti, H ; Sharif University of Technology
2010
Abstract
A novel method for combining bigram model and Probabilistic Latent Semantic Analysis (PLSA) is introduced for language modeling. The motivation behind this idea is the relaxation of the bag of words assumption fundamentally present in latent topic models including the PLSA model. An EM-based parameter estimation technique for the proposed model is presented in this paper. Previous attempts to incorporate word order in the PLSA model are surveyed and compared with our new proposed model both in theory and by experimental evaluation. Perplexity measure is employed to compare the effectiveness of recently introduced models with the new proposed model. Furthermore, experiments are designed and...
A novel method to detect rotor blades echo
, Article IEEE National Radar Conference - Proceedings, 10 May 2010 through 14 May 2010, Washington DC ; 2010 , Pages 1331-1334 ; 10975659 (ISSN) ; 9781424458127 (ISBN) ; Nayebi, M. M ; Sharif University of Technology
2010
Abstract
In this paper, the effect of the main rotor of an armed helicopter on radar return signal and its modulation condition are considered. After analyzing references and experimental data, this paper proposes a new method based on inherent modulation in main rotor echo. This method is able to enhance the probability of detection. The simulation is performed for both simulated and practical echo signal. Simulation results confirm that our proposed scheme is effective. Moreover, a new domain for distinguishing and measuring the rotation feature of a rotary target is proposed. This paper is based on practical experiments (rotation domain)
New product promotion and e-commerce; effects of retailer webpage layout on buyer behavior
, Article 5th IEEE International Conference on Management of Innovation and Technology, ICMIT2010, Singapore, 2 June 2010 through 5 June 2010 ; 2010 , Pages 1224-1229 ; 9781424465675 (ISBN) ; Vessal, S. R ; Movarrei, R ; Sharif University of Technology
2010
Abstract
This article studies effects of webpage layout in an online retailer on buyer behavior towards new products and is a sequel to a study performed by authors in department stores. Webpage layout -in terms of parameters which influence buyer behavior- is formulated by two variables; pattern of prices and pattern of popularity. A novel method based on above-mentioned study, has been developed to measure these two factors, so that they can be compared against retailer sales statistics. Investigating this relationship helps both online retailers and marketing agents to better understand effect of webpage layout in promoting a newly developed product. Results show that correlation between price...
Mysteries of new product promotion; Effects of layout on buyer behavior
, Article 5th IEEE International Conference on Management of Innovation and Technology, ICMIT2010, 2 June 2010 through 5 June 2010, Singapore ; 2010 , Pages 468-473 ; 9781424465675 (ISBN) ; Rezaee Vessal, S ; Rezaee Vessal,S ; Sharif University of Technology
2010
Abstract
This article studies effects of store layout in a department store on buyer behavior towards new products. Shelf layout -in terms of parameters which influence buyer behavior- is formulated by two variables; pattern of prices and pattern of popularity. A novel method based on previous works of authors has been developed to measure these two factors, so that they can be compared against shares of department sales statistics. Investigating this relationship helps both retailers and marketing agents to better understand effect of shelf layout in promoting a newly developed product. Results show that correlation between price difference and department share is strong. There is also a weaker...