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Design and evaluation of an articulated ankle foot orthosis with plantarflexion resistance on the gait: A case series of 2 patients with hemiplegia
, Article Journal of Biomedical Physics and Engineering ; Volume 10, Issue 1 , 2020 , Pages 119-128 ; Arazpour, M ; Aminian, G ; Baniasad, M ; Yamamoto, S ; Sharif University of Technology
Shiraz University of Medical Sciences
2020
Abstract
Ankle-foot orthoses (AFOs) have been described to have positive effects on the gait biomechanics in stroke patients. The plantarflexion resistance of an AFO is considered important for hemiplegic patients, but the evidence is still limited. The purpose of this case series was to design and evaluate the immediate effect of an articulated AFO on kinematics and kinetics of lower-limb joints in stroke patients. The articulated AFO with the adjustment of plantarflexion resistance was designed. The spring generates a plantarflexion resistance of the ankle joint at initial stance phase. The efficacy of orthosis was evaluated on two stroke patients in 2 conditions: without an AFO and with the AFO....
Semantic Clustering of Persian Verbs
, M.Sc. Thesis Sharif University of Technology ; Sameti, Hossein (Supervisor)
Abstract
Semantic classification of words based on unsupervised learning methods is a challenging issue in computational lexical semantics. The goal of this field of study is to recognize the words that are in the same semantic classes; i.e., can have the same set of arguments. Among all word categories, verb is known as one the most important and is assumed as the central part of the sentence in certain linguistic theories such as case grammar and dependency grammar. Based on Levin’s idea, diathesis alternations and the similarity between these alternations are the clues for the semantic classification of verbs. This idea is verified in languages such as English and German with promising results....
Management of Resources and Equipments Rental in Resource Constrained Project Scheduling Problem with Consideration of Project Gains and Payments and The Cost of Non-Source
, M.Sc. Thesis Sharif University of Technology ; Shadrokh, Shahram (Supervisor)
Abstract
The subject of project scheduling is one of classic subjects in project management, and It contains the wide range of optimization problems. Using making changes in variables and constraints , it is possible to create new problems which seem better in the real world. Project tasks need resources for implementation. In some cases, it is considered that any time there are enough resources. In some other cases, it assumes, resources are limited, and resource optimum purchasing is the purpose, which this kind of issues is named resources investment problems (RIP). In this research it assumes, project necessary resources, are rented and renting costs depends on the time of owning. In standard...
Cross-Layer Design Based on Inter-Session Network Coding
,
M.Sc. Thesis
Sharif University of Technology
;
Golestani, Jamaloddin
(Supervisor)
Abstract
Network coding as an efficient approach for performance improvement of communication networks has been introduced by Ahlswede et al. Despite simple forwarding schemes, in network coding scenarios, intermediate nodes forward the encoded version of their received packets. In wireless Networks, resource allocation includes routing, network coding, flow control, scheduling and power control.In this dissertation a joint scheduling, routing, flow control and Inter-session NC formulation based on a convex optimization problem is studied. Our formulation integrates the optimal scheduling, flow control and Inter-session network coding with a modified version of minimum delay routing. We propose a way...
Unsupervised induction of persian semantic verb classes based on syntactic information
, Article Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Warsaw ; Volume 7912 LNCS , June , 2013 , Pages 112-124 ; 03029743 (ISSN) ; 9783642386336 (ISBN) ; Rasooli, M. S ; Sameti, H ; Sharif University of Technology
2013
Abstract
Automatic induction of semantic verb classes is one of the most challenging tasks in computational lexical semantics with a wide variety of applications in natural language processing. The large number of Persian speakers and the lack of such semantic classes for Persian verbs have motivated us to use unsupervised algorithms for Persian verb clustering. In this paper, we have done experiments on inducing the semantic classes of Persian verbs based on Levin's theory for verb classes. Syntactic information extracted from dependency trees is used as base features for clustering the verbs. Since there has been no manual classification of Persian verbs prior to this paper, we have prepared a...
On the capacity of level and type modulations in Molecular communication with ligand receptors
, Article IEEE International Symposium on Information Theory - Proceedings, 14 June 2015 through 19 June 2015 ; Volume 2015-June , 2015 , Pages 1951-1955 ; 21578095 (ISSN) ; 9781467377041 (ISBN) ; Mirmohseni, M ; Nasiri Kenari, M ; Fekri, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
In this paper, we consider the bacterial point-to-point communication problem with one transmitter and one receiver by considering the ligand receptor binding process. The most commonly investigated signalling model, referred to as the Level Scenario (LS), uses one type of a molecule with different concentration levels for signaling. An alternative approach is to employ multiple types of molecules with a single concentration level, referred to as the Type Scenario (TS). We investigate the trade-offs between the two scenarios for the ligand receptor from the capacity point of view. For this purpose, we evaluate the capacity using numerical algorithms. Moreover, we derive an upper bound on the...
Adsorption of TiO2 nanoparticles on glass fibers
, Article Journal of Physical Chemistry C ; Volume 111, Issue 27 , 2007 , Pages 9794-9798 ; 19327447 (ISSN) ; Taghavinia, N ; Irajizad, A ; Mahdavi, M ; Sharif University of Technology
2007
Abstract
Titania was deposited on glass fibers with a partial epoxy layer coating from a solution containing TiO2 nanoparticles at T = 90°C, and the adsorption process was examined by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared (FT-IR) spectroscopy, and photocatalytic activity measurements. XPS data demonstrated that about 25% of the surface was covered with TiO2 nanoparticles, with 10% on the epoxy layer and 15% on the glass body. It was found that TiO2 nanoparticles can be readily adsorbed on epoxy groups, whereas they have a low tendency to adsorb on carbon polymer chains. This difference can be...
Comparative assessment of sewage sludge disposal alternatives in Mashhad: a life cycle perspective
, Article Environmental Science and Pollution Research ; Volume 27, Issue 1 , 2020 , Pages 315-333 ; Tafazzoli, S. M ; Aminian, S. T ; Avami, A ; Sharif University of Technology
Springer
2020
Abstract
Municipal wastewater treatment facilities produce a lot of sludge which is concentrated with different pollutants. The sustainable design of the sludge disposal alternatives is of crucial importance for touristic cities like Mashhad in Iran. Increasing sludge generation and its accumulation in the city and more stringent legislations highlight the challenge of sludge disposal, recently. This study compares different alternatives to reach maximum possible environmental benefits as well as the most cost-effective technologies. In this study, life cycle analysis (LCA) assesses different scenarios for disposal of sewage sludge which is aerobically treated and dewatered for two real case studies....
Capacity of LTI-Poisson channel for diffusion based molecular communication
, Article IEEE International Conference on Communications, ICC 2015, 8 June 2015 through 12 June 2015 ; Volume 2015-September , June , 2015 , Pages 1060-1065 ; 15503607 (ISSN) ; 9781467364324 (ISBN) ; Arjmandi, H ; Gohari, A ; Kenari, M. N ; Mitra, U ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
The LTI-Poisson model is a natural extension of the conventional memoryless Poisson channel to include memory, and can model the ISI effect in diffusion based molecular communication networks. In this paper, we exploit prior art on linear ISI channels to provide a computable finite-letter characterization of the capacity of single-hop LTI-Poisson networks. Then we find more explicit single-letter lower and upper bounds on the capacity in the point to point case. Further, an approach for bounding mutual information in the low SNR regime using the symmetrized KL divergence is introduced and its applicability for Poisson channels is demonstrated. This leads to a non-trivial upper bound on the...
On the capacity of signal dependent noise channels
, Article IWCIT 2017 - Iran Workshop on Communication and Information Theory, 3 May 2017 through 4 May 2017 ; 2017 ; 9781509047833 (ISBN) ; Ghourchian, H ; Gohari, A ; Mirmohseni, M ; Nasiri Kenari, M ; Sharif University of Technology
2017
Abstract
In some applications, the variance of measurement noise depends on the signal that we aim to measure. For instance, additive Gaussian signal-dependent noise (AGSDN) channel models are used in molecular and optical communication. Herein we provide lower and upper bounds on the capacity of additive signal dependent noise (ASDN) channels. We also provide sufficient conditions under which the capacity becomes infinity. © 2017 IEEE
Synthesis of titania nanofibers for photocatalytic applications
, Article Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry ; Volume 37, Issue 6 , 2007 , Pages 457-460 ; 15533174 (ISSN) ; Taghavinia, N ; Iraji Zad, A ; Mahdavi, M ; Chavoshi, M ; Sharif University of Technology
2007
Abstract
Titania nanofibers were prepared using a colloidal solution of Titania nanoparticles and a templating method. The preparation comprises impregnation of cellulose fibers in the solution containing Titania nanoparticles followed by thermal removal of the cellulose template. It is evidenced by scanning electron microscopy (SEM) that the residue substance consists of micron size fibers with a microstructure of nanofibers. The pore size distribution of the substance is multi-scale and fractal morphology was demonstrated with two fractal regimes with dimensions of 1.78 and 2.97 for sizes below and above 7.5nm, respectively. The surface area of the Titania fibers was measured about 250m2/g. The...
TiO2 nanofibre assisted photocatalytic degradation of reactive blue 19 dye from aqueous solution
, Article Environmental Technology ; Volume 30, Issue 3 , 2009 , Pages 233-239 ; 09593330 (ISSN) ; Ghaneian, M. T ; Taghavinia, N ; Khajeh Aminian, M ; Hashemian, S. J ; Sharif University of Technology
2009
Abstract
The photocatalytic degradation of Reactive Blue 19 (RB19) dye has been studied using TiO2 nanofibre as the photocatalyst in aqueous solution under UV irradiation. Titanium dioxide nanofibre was prepared using a templating method with tetraisopropylorthotitanate as a precursor. The experiments were carried out in the presence of the TiO2 nanofibre, and the effects of pH and electron acceptors on the degradation process were investigated. In order to observe the quality of the aqueous solution, chemical oxygen demand (COD) measurements were also carried out before and after the treatments. The photocatalytic decomposition of RB19 was most efficient in acidic solution. With the addition of...
Two-dimensional clustering of nanoparticles on the surface of cellulose fibers
, Article Journal of Physical Chemistry C ; Volume 113, Issue 28 , 2009 , Pages 12022-12027 ; 19327447 (ISSN) ; Taghavinia, N ; Irajizad, A ; Mahdavi, M ; Ye, J ; Chavoshi, M ; Vashaei, Z ; Sharif University of Technology
2009
Abstract
Density of surface charges of cellulose fibers and -potential of TiO2 nanoparticles in the solution were measured and controlled by pH. The adsorption and clustering of TiO2 nanoparticles on the surface of cellulose fibers were studied using scanning electron microscopy (SEM) and a scale in different situations of repulsion and attraction between the particles and surface. The experiments show formation of two-dimensional clusters of nanoparticles on the surface. Weight measurement of the adsorbed particles and clusters via the adsorption time results in that there are three stages containing nucleation, two-dimensional growth and saturation for clustering of nanoparticles on the surface....
Highly porous TiO2 nanofibres with a fractal structure
, Article Nanotechnology ; Volume 17, Issue 2 , 2006 , Pages 520-525 ; 09574484 (ISSN) ; Taghavinia, N ; Iraji Zad, A ; Mahdavi, S. M ; Chavoshi, M ; Ahmadian, S ; Sharif University of Technology
2006
Abstract
TiO2 nanofibres were prepared using a templating method with tetraisopropylorthotitanate (TiPT) as a precursor. The preparation comprises liquid phase deposition on cellulose fibres followed by thermal removal of the cellulose template. The obtained TiO2 fibrous substance consists of micron-size fibres with a microstructure of nanofibres. It was demonstrated that nanofibres are basically formed through the aggregation of TiO2 nanoparticles and nanorods into chain structures during the thermal treatment process. The measured surface area of the TiO2 fibres was about 250 m2 g-1. It was shown that the pore size distribution is multi-scale and a fractal morphology was demonstrated with two...
Efficient Transmission and Achievable Rates at Molecular Communication
, Ph.D. Dissertation Sharif University of Technology ; Nasiri-Kenari, Masoumeh (Supervisor) ; Gohari, Amin (Supervisor) ; Mirmohseni, Mahtab (Supervisor)
Abstract
Molecular communication (MC), which has stimulated a great deal of interest in recent years, is a new paradigm for communication among nanoscale biological machines. In MC, molecules are carriers of information and information is encoded into concentration, type or releasing time of molecules. One of the issues in the problem of finding more explicit bounds on the capacity.An approach for bounding mutual information in the low SNR regime using the symmetrized KL divergence is introduced and its applicability to Poisson channels is shown. To the best of our knowledge, the first upper bound on the capacity of Poisson channel with a maximum transmission constraint in the low SNR regime is...
Semi-IPN carrageenan-based nanocomposite hydrogels: Synthesis and swelling behavior
, Article Journal of Applied Polymer Science ; Volume 118, Issue 5 , 2010 , Pages 2989-2997 ; 00218995 (ISSN) ; Marandi, G. B ; Pourjavadi, A ; Kiani, G ; Sharif University of Technology
2010
Abstract
Inclusion of nano-clays into hydrogels is an efficient approach to produce nanocomposite hydrogels. The introduction of nano-clay into hydrogels causes an increase in water absorbency. In the present work, Nanocomposite hydro-gels based on kappa-carrageenan were synthesized using sodium montmorillonite as nano-clay. Acrylamide and meth-ylenebisacrylamide were used as monomer and crosslinker, respectively. The structure of nanocomposite hydrogels was investigated by XRD and SEM techniques. Swelling behavior of nanocomposite hydrogels was studied by varying clay and carrageenan contents as well as methylenebisacrylamide concentration. An optimum swelling capacity was achieved at 12% of sodium...
Comparison between isothermal and non-isothermal fatigue behavior in a cast aluminum-silicon-magnesium alloy
, Article Strength of Materials ; Volume 47, Issue 6 , November , 2015 , Pages 840-848 ; 00392316 (ISSN) ; Winter, G ; Farrahi, G. H ; Sharif University of Technology
Springer New York LLC
2015
Abstract
In the present study, the out-of-phase thermomechanical fatigue (OP-TMF) behavior of a cast aluminum-silicon-magnesium alloy, the A356.0 alloy which has been widely used in diesel engine cylinder heads, is compared to room-temperature and high-temperature low cycle fatigue (RT-, HT-LCF) behaviors. For this purpose, strain/temperature-controlled isothermal and non-isothermal fatigue tests were performed based on realistic loading conditions in cylinder heads. Fatigue tests results showed that the plastic strain increased during cycles under constant mechanical strain amplitude, while the specimen failed. Under LCF loadings, the cyclic hardening occurred at low temperatures for the A356.0...
Machine learning in energy economics and finance: A review
, Article Energy Economics ; Volume 81 , 2019 , Pages 709-727 ; 01409883 (ISSN) ; Creamer, G. G ; Rafizadeh, N ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Machine learning (ML) is generating new opportunities for innovative research in energy economics and finance. We critically review the burgeoning literature dedicated to Energy Economics/Finance applications of ML. Our review identifies applications in areas such as predicting energy prices (e.g. crude oil, natural gas, and power), demand forecasting, risk management, trading strategies, data processing, and analyzing macro/energy trends. We critically review the content (methods and findings) of more than 130 articles published between 2005 and 2018. Our analysis suggests that Support Vector Machine (SVM), Artificial Neural Network (ANN), and Genetic Algorithms (GAs) are among the most...
Fault-tolerant earliest-deadline-first scheduling algorithm
, Article 21st International Parallel and Distributed Processing Symposium, IPDPS 2007, Long Beach, CA, 26 March 2007 through 30 March 2007 ; 2007 ; 1424409101 (ISBN); 9781424409105 (ISBN) ; Miremadi, S. G ; Deconinck, G ; Sharif University of Technology
2007
Abstract
The general approach to fault tolerance in uniprocessor systems is to maintain enough time redundancy in the schedule so that any task instance can be re-executed in presence of faults during the execution. In this paper a scheme is presented to add enough and efficient time redundancy to the Earliest-Deadline-First (EDF) scheduling policy for periodic real-time tasks. This scheme can be used to tolerate transient faults during the execution of tasks. We describe a recovery scheme which can be used to re-execute tasks in the event of transient faults and discuss conditions that must be met by any such recovery scheme. For performance evaluation of this idea a tool is developed. © 2007 IEEE