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Fuzzy Control of Percutaneous Needle Using Ultrasound Imaging-Based
Trajectory Planning
,
M.Sc. Thesis
Sharif University of Technology
;
Jahed, Mehran
(Supervisor)
Abstract
Subcutaneous needle insertion is one of the key methods of limited invasive surgery in medical diagnosis and treatment. However, errors in needle targeting can reduce the effectiveness of such efforts. One of the main factors of errors is due to the human guidance of the needle, which many researches have approached in recent years, and among the suggested solutions is the use of automatic or semi-automatic assist systems. Considering the treatment of prostate cancer by brachytherapy method, this research has developed a semi-automatic physician assistance system using navigation based on the potential field method and ultrasound images of the needle location, and sliding mode fuzzy...
Estimation Elasticity of Calorie and Macronutrients with Respect to Income in the Islamic Republic of Iran, 2008-2016
, M.Sc. Thesis Sharif University of Technology ; Vesal, Mohammad (Supervisor)
Abstract
Inadequate nutrition is perhaps the most important problem facing the poor. Being hungry lowers productivity and decreases individuals’ income. All of these factors conspire to help the poor stay poor. Raising the income of the poor is one solution for this problem if the elasticity of calorie and macronutrients with respect to income is greater than zero. This study employs both nonparametric and parametric methods to obtain the elasticity of per capita calorie and macronutrients with respect to household per capita expenditure. The case presented is for urban areas of Islamic republic of Iran, 2008-2016. Under each estimation strategy we employ, we find a strongly significant and positive...
Towards high data-rate diffusive molecular communications: A review on performance enhancement strategies
, Article Digital Signal Processing: A Review Journal ; 2021 ; 10512004 (ISSN) ; Nasiri-Kenari, M ; Mitra, U ; Sharif University of Technology
Elsevier Inc
2021
Abstract
Diffusive molecular communications (DiMC) have recently gained attention as a candidate for nano- to micro- and macro-scale communications due to its simplicity and energy efficiency. As signal propagation is solely enabled by Brownian motion mechanics, DiMC faces severe inter-symbol interference (ISI), which limits reliable and high data-rate communications. Herein, recent literature on DiMC performance enhancement strategies is surveyed; key research directions are identified. Signaling design and associated design constraints are presented. Studies on fundamental information theoretic limits of DiMC channel are reviewed. Classical and novel transceiver designs are discussed with an...
Towards high data-rate diffusive molecular communications: A review on performance enhancement strategies
, Article Digital Signal Processing: A Review Journal ; Volume 124 , 2022 ; 10512004 (ISSN) ; Nasiri Kenari, M ; Mitra, U ; Sharif University of Technology
Elsevier Inc
2022
Abstract
Diffusive molecular communications (DiMC) have recently gained attention as a candidate for nano- to micro- and macro-scale communications due to its simplicity and energy efficiency. As signal propagation is solely enabled by Brownian motion mechanics, DiMC faces severe inter-symbol interference (ISI), which limits reliable and high data-rate communications. Herein, recent literature on DiMC performance enhancement strategies is surveyed; key research directions are identified. Signaling design and associated design constraints are presented. Studies on fundamental information theoretic limits of DiMC channel are reviewed. Classical and novel transceiver designs are discussed with an...
Diffusion based molecular communication: A simple near optimal receiver
, Article IWCIT 2014 - Iran Workshop on Communication and Information Theory ; 7-8 May , 2014 ; Print ISBN: 9781479948789 ; Arjmandi, H ; Gohari, A ; Kenari, M. N ; Mitra, U ; Sharif University of Technology
2014
Abstract
Nanonetworking indicates new solutions for many applications in biomedical and industrial fields. In this paper, we examine the diffusion-based molecular communication for information transmission in nano-networks. Design of practical decoders for resource-limited nano-networks requires an understanding the fundamental performance limits of memory-limited decoders. While some existing works in the literature do consider decoders with limited memory, to best of our knowledge, the tradeoff between memory and probability of error has not been studied in the literature. In this paper we make a first step by studying this tradeoff for a particular molecular communication channel between two...
Receivers for diffusion-based molecular communication: Exploiting memory and sampling rate
, Article IEEE Journal on Selected Areas in Communications ; Vol. 32, issue. 12 , 2014 , pp. 2368-2380 ; ISSN: 07338716 ; Arjmandi, H ; Gohari, A ; Nasiri-Kenari, M ; Mitra, U ; Sharif University of Technology
2014
Abstract
In this paper, a diffusion-based molecular communication channel between two nano-machines is considered. The effect of the amount of memory on performance is characterized, and a simple memory-limited decoder is proposed; its performance is shown to be close to that of the best possible decoder (without any restrictions on the computational complexity or its functional form), using genie-aided upper bounds. This effect is adapted to the case of Molecular Concentration Shift Keying; it is shown that a four-bit memory achieves nearly the same performance as infinite memory for all of the examples considered. A general class of threshold decoders is considered and shown to be suboptimal for a...
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...
Adaptive molecule transmission rate 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 1066-1071 ; 15503607 (ISSN) ; 9781467364324 (ISBN) ; Soleimanifar, M ; Gohari, A ; Kenari, M. N ; Mitra, U ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
In this paper, a simple memory limited transmitter for molecular communication is proposed, in which information is encoded in the diffusion rate of the molecules. Taking advantage of memory, the proposed transmitter reduces the ISI problem by properly adjusting its diffusion rate. The error probability of the proposed scheme is derived and the result is compared with the lower bound on error probability of the optimum transmitter. It is shown that the performance of introduced transmitter is near optimal (under certain simplifications). Simplicity is the key feature of the presented communication system: the transmitter follows a simple rule, the receiver is a simple threshold decoder and...
Adaptive Transmission Rate with a Fixed Threshold Decoder for Diffusion-Based Molecular Communication
, Article IEEE Transactions on Communications ; Volume 64, Issue 1 , 2016 , Pages 236-248 ; 00906778 (ISSN) ; Soleimanifar, M ; Gohari, A ; Nasiri Kenari, M ; Mitra, U ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
In this paper, a simple memory limited transmitter for molecular communication is proposed, in which information is encoded in the emission rate of the molecules. Taking advantage of memory, the proposed transmitter reduces the ISI problem by properly adjusting its emission rate, which can be interpreted as water-filling on the expected interference. The error probability of the proposed scheme is derived and the result is compared with the error probability of the optimal transmitter obtained by dynamic programming methods. Furthermore, for the special case of channel with one symbol memory, a tight lower bound on error probability is derived. Numerical results show that the performance of...
The effect of multiwalled carbon nanotubes and activated carbon on the morphology and photocatalytic activity of TiO2/C hybrid materials
, Article Catalysis Science & Technology ; 1 , Jan , 2011 , pp. 279-284 ; Ghasemia, S. (Shahnaz) ; Gholami, M. R. (Mohamad Reza) ; Sharif University of Technology
2011
Abstract
TiO2 nanoparticles supported on activated carbon (AC) and multiwalled carbon nanotubes (MWCNTs) were prepared by the sol–gel method using ultrasonic irradiation. All the prepared samples were calcined at different temperatures and characterized by X-ray diffraction, nitrogen adsorption/desorption isotherms, scanning electron microscopy, transmission electron microscopy and diffuse reflectance spectroscopy. The effects of size and type of carbon on the morphology and photocatalytic activity of the resulting hybrid materials were investigated. The results showed that a decrease in the size of the carbon led to a decrease in size of TiO2 nanoparticles. Both AC and MWCNTs retarded the...