Solving an Integarted Land-Use and Transportation Problem with Meta-Heuristic Algorithms

, M.Sc. Thesis Sharif University of Technology Haghighi Naeini, Nima (Author) ; Poorzahedy, Hossein (Supervisor)

Abstract

Land use and transportation are interrelated, and as a result in cities’ development plans, there is a need for a model that can consider both of them simultaneously. The model presented in this study is bi-level. The upper level designs the zonal population and employment, and transportation network link capacities. Its objective is to minimize the total cost of residence, receiving goods and services, and transportation. The lower level consists of two inter-related problems. One of these problems determines the allocation of population and employment and the other obtains link flows by a joint bi-modal mode choice assignment model. This study aims to develop a meta-heuristic algorithm to...

Improving Text-Video Retrieval Models using Language Models

, M.Sc. Thesis Sharif University of Technology Haghighi Naeini, Parsa (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

Models specifically designed for images are widely used in various video understanding tasks, including text-to-video retrieval. For this purpose, videos are viewed as sequences of frames. Most models uniformly select a few frames from each video and pass them to the image-specific model. While simple, this method often results in the selection of repetitive or irrelevant frames. Several trainable frame samplers have been introduced, but none can select important and diverse frames. In this study, we propose a teacher-student pipeline for training a frame sampler tailored for the text-to-video retrieval task. In this pipeline, frame-to-frame and frame-to-description similarities obtained by...

An economic-statistical design of simple linear profiles with multiple assignable causes using a combination of MOPSO and RSM

, Article Soft Computing ; Volume 25, Issue 16 , 2021 , Pages 11087-11100 ; 14327643 (ISSN) Ershadi, M. J ; Ershadi, M. M ; Haghighi Naeini, S ; Akhavan Niaki, S. T ; Sharif University of Technology

Springer Science and Business Media Deutschland GmbH 2021

Abstract

An economic-statistical design with multiple assignable causes following exponential distribution is presented in this paper for linear profiles. For this purpose, a tri-objective optimization model is proposed to minimize the cost with desired statistical performances. Average Run Length (ARL) as the primary statistical measure is employed for the appraisal of the designed linear profiles. The first objective to be minimized is a cost function that models the implementation cost in different states. The second objective is to maximize ARL or the in-control average run-length of the monitoring scheme. The third objective to be minimized is ARL 1 or the out-of-control average run-length of...

Using of SnS2 Nanostructured Layer as an Electron Transport Layer in the Perovskite Solar Cells

, Ph.D. Dissertation Sharif University of Technology Haghighi, Maryam (Author) ; Mahdavi, Mohammad (Supervisor) ; Taghavinia, Nima (Supervisor) ; Mohammadpour, Raheleh (Co-Supervisor)

Abstract

In this research, we focus on study and investigation of the role of Tin(IV) Sulfide (SnS2) nanostructured layer as electron transport layer in perovskite and chalcogenide thin film solar cells. For this purpose, SnS2 powder was prepared through hydro/solvo-thermal method, utilizing different ratios of water and ethanol as solvent and various sulfur sources (thioacetamide and thiourea). Afterwards, different solvents were investigated to achieve a stable ink (about one month) with uniform dispersion. After determining the appropriate ink and powder, thin films of SnS2 were prepared employing spin coating, spray pirolysis and laser pulsed deposition (PLD) methods and characterized. With each...

An investigation on the torsional sensitivity and resonant frequency of an AFM with sidewall and top-surface probes

, Article ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2010, Montreal, QC, 15 August 2010 through 18 August 2010 ; Volume 4 , 2010 , Pages 589-599 ; 9780791844120 (ISBN) Kahrobaiyan, M. H ; Ahmadian, M. T ; Haghighi, P ; Haghighi, A ; Sharif University of Technology

2010

Abstract

The resonant frequencies and torsional sensitivities of an atomic force microscope (AFM) with assembled cantilever probe (ACP) are studied. This ACP comprises a horizontal cantilever, a vertical extension and two tips located at the free ends of the cantilever and the extension which makes the AFM capable of simultaneous topography at top-surface and sidewalls of microstructures especially microgears which consequently leads to a time-saving swift scanning process. In this work, the effects of the sample surface contact stiffness and the geometrical parameters such as the ratio of the vertical extension length to the horizontal cantilever length and the distance of the vertical extension...

An investigation on the flexural sensitivity and resonant frequency of an AFM with sidewall and top-surface probes

, Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), 12 November 2010 through 18 November 2010, Vancouver, BC ; Volume 10 , 2010 , Pages 419-427 ; 9780791844472 (ISBN) Kahrobaiyan, M. H ; Ahmadian, M. T ; Haghighi, P ; Haghighi, A ; Sharif University of Technology

2010

Abstract

The resonant frequencies and flexural sensitivities of an atomic force microscope (AFM) assembled cantilever probe which comprises a horizontal cantilever, a vertical extension and two tips located at the free ends of the cantilever and the extension are studied. This probe makes the AFM capable of simultaneous topography at top-surface and sidewalls of microstructures especially microgears which leads to a time-saving swift scanning process. In this work, the effects of the sample surface contact stiffness and the geometrical parameters such as the ratio of the vertical extension length to the horizontal cantilever length and the distance of the vertical extension from clamped end of the...

Sensitivity and resonant frequency of an AFM with sidewall and top-surface probes for both flexural and torsional modes

, Article International Journal of Mechanical Sciences ; Volume 52, Issue 10 , October , 2010 , Pages 1357-1365 ; 00207403 (ISSN) Kahrobaiyan, M. H ; Ahmadian, M. T ; Haghighi, P ; Haghighi, A ; Sharif University of Technology

2010

Abstract

The resonant frequencies and flexural sensitivities of an atomic force microscope (AFM) with assembled cantilever probe (ACP) are studied. This ACP comprises a horizontal cantilever, a vertical extension and two tips located at the free ends of the cantilever and the extension, which makes the AFM capable of simultaneous topography at top surface and sidewalls of microstructures especially microgears, which consequently leads to a time-saving swift scanning process. In this work, the effects of the sample surface contact stiffness and the geometrical parameters such as the ratio of the vertical extension length to the horizontal cantilever length and the distance of the vertical extension...

Investigations of thermal behavior of Fe3Si2O5(OH)4·Sb3O6(OH)·Sb2O3 in air atmosphere: a study of acidic leaching process of Sb mineral

, Article Journal of Thermal Analysis and Calorimetry ; Volume 148, Issue 9 , 2023 , Pages 3295-3300 ; 13886150 (ISSN) Sajadi, S.A.A ; Sadeghi Naeini, M ; Sharif University of Technology

Springer Science and Business Media B.V 2023

Abstract

The thermal behavior of Fe3Si2O5(OH)4·Sb3O6(OH)·Sb2O3 (a sample of antimony from Sefidabe mine in Zahedan) was investigated by the technique of thermogravimetry under air atmosphere from 25 to 1200 °C. The obtained results from TGA were reported. This study reports comprehensive information about these minerals. XRD and XRF techniques, UV/visible and elemental analysis such as ICP are used to identify the products at different decomposition steps. The acidic leaching of this mineral Fe3Si2O5(OH)4·Sb3O6(OH)·Sb2O3 is carried out, and the obtained results are reported. In total, the recovery was achieved by leaching with hydrochloric acid was 85% at D80 granulation below 45 microns. In leaching...

Fabrication of a novel 3D scaffold for cartilage tissue repair: In-vitro and in-vivo study

, Article Materials Science and Engineering C ; Volume 128 , 2021 ; 09284931 (ISSN) Haghighi, P ; Shamloo, A ; Sharif University of Technology

Elsevier Ltd 2021

Abstract

Self-repairing is not an advanced ability of articular cartilage. Tissue engineering has provided a novel way for reconstructing cartilage using natural polymers because of their biocompatibility and bio-functionality. The purpose of cartilage tissue engineering is to design a scaffold with proper pore structure and similar biological and mechanical properties to the native tissue. In this study, porous scaffolds prepared from gelatin, chitosan and silk fibroin were blended with varying ratios. Between the blends of chitosan (C), gelatin (G) and silk fibroin (S), the scaffold with the weight per volume ratio of 2:2:3 (w/v) showed the most favorable and higher certain properties than the...

Behran Mehr Peyma's Activities Analysis

, M.Sc. Thesis Sharif University of Technology Haghighi, Erfan (Author) ; Miremadi, Alireza (Supervisor)

Abstract

Behran Mehr Peyma (BMP) is an elevator equipment producer and trader in Iran which was established in 2004. At first they are producing some regular parts of elevator and then during these years they are trying to improve their work and expand their business till they have the 15% market share in elevator market in Tehran.In this thesis I am trying to use the SWOT and PETS methods to show the exact situation of BMP comparing to the whole market considering the competitors.During this reduction in the market I suggest to BMP to change some policies and use some of its strength to attract some new customers, changing their brand name and find a relation to contribute in some tenders and...

Needle Steering in Soft Tissue

, M.Sc. Thesis Sharif University of Technology Haghighi, Payam (Author) ; Jahed, Mehran (Supervisor)

Abstract

Medical needle interventions are a common technique for accessing tissue structures.In these procedures, needles are used, for example, to extract biopsy samples, brachytherapy, and to insert drugs. In TRUS guided prostate brachytherapy application, Physicians used ulterasound imaging to steer the needle and insert radioactive seeds into cancerous tumors to irradiate surrounding tissue over several months. Prostate rotation, deformation, and unavailability of imaging data during part of the insertion path result in misplaced seeds. To overcome these problems, in this research, we modeled the prostate, its membrane and the surrounding fatty tissue as linearly elastic homogenous material, and...

Experimental Investigation on Debonding between FRP sheets and Structures

, M.Sc. Thesis Sharif University of Technology Haghighi, Sina (Author) ; Toufigh, Vahab (Supervisor)

Abstract

This study has investigated the effects of different environmental conditions on the bond at the interface between two fiber reinforced polymer (FRP) layers. A total of 945 single lap splice coupons with three bond length were made using wet lay-up technic. There were used three unidirectional fabrics and one type of epoxy resin. A Uniaxial tensile test was performed on samples after 2, 4, 12, 20, 28, 36 and 48 weeks of exposure. Also series of test were conducted in order to determine the minimum lap splice length of single splice FRP samples. The experimental results indicated reduction of bond strength in glass specimens that was 17 % after 48 weeks of exposure while for same amount of...

A Hardware-Software Partitioner for Deep Learning Algorithms

, M.Sc. Thesis Sharif University of Technology Haghighi, Sepand (Author) ; Hessabi, Shahin (Supervisor)

Abstract

Deep learning, as a subdivision of machine learning, attempts to model high-level concepts by using a deep graph, consisting of several layers of linear and nonlinear transformations. Implementing these algorithms on hardware is a big challenge.¬This project offers a system in which various hardware methodologies can be used to implement deep learning algorithms side by side. The overall structure of the system consists of high-level programming interfaces for implementation and expression of machine learning algorithms by the user, which will be available as libraries in a high-level programming language such as Python, Ruby, and Julia. These interfaces allow the user to evaluate their...

Analysis of Temporal Stability and Transferability of Trip Distribution Models Considering Urban Development Patterns: The Case of Shiraz

, M.Sc. Thesis Sharif University of Technology Haghighi, Mohammad (Author) ; Shafahi, Yousef (Supervisor)

Abstract

Trip distribution is the second step of the four-step travel demand modeling. Like other travel demand models, the most important objective of trip distribution models generation is forecasting the travel data of a year in the future. On the one hand, extensive changes in cities’ urban structures and people’s travel behavior during the years brings up the essential question of how temporally stable and transferable trip distribution models are? This question becomes even more important when the more complex structure of trip distribution models compared to models such as trip generation is considered. On the other hand, it is logical to assume that the consideration of the effects of urban...

Design and Manufacture of an Engineered Scaffold in Order to Repair Tissue Exposed to Mechanical Force, for Tissue Engineering Application

, M.Sc. Thesis Sharif University of Technology Haghighi, Paniz (Author) ; Shamloo, Amir (Supervisor)

Abstract

Articular cartilage has limited repair capability following traumatic injuries and current methods of treatment remain inefficient. Reconstructing cartilage provides a new way for cartilage repair and natural polymers are often used as scaffold because of their biocompatibility and biofunctionality. The goal of cartilage tissue engineering is to design a scaffold with proper pore structure and similar mechanical properties to the native tissue. In this study Porous scaffolds prepared from silk fibroin, chitosan and gelatin blends with varying ratio of silk fibroin and gelatin by freeze drying method were characterized for physicochemical, mechanical and biological properties. Among the...

Biomechanical Effects of Intervertebral Disc Nucleotomy Surgery on Adjacent Joints Using a Coupled Musculoskeletal Finite Element Model

, M.Sc. Thesis Sharif University of Technology Haghighi, Ali (Author) ; Arjmand, Navid (Supervisor)

Abstract

According to studies, low back pain is one of the most common and costly musculoskeletal disorders. Herniation of intervertebral discs exerts pressure on the nerves, causing pain. To alleviate this, physicians perform a procedure called nucleotomy, which removes the disc's nucleus pulposus to reduce pressure, retract the disc, and relieve pain. Accurate estimation of spinal forces during activities is essential for injury prevention, activity correction, and improved surgical techniques. Although laboratory studies on humans or cadavers are valid, they are often invasive and limited to simple scenarios, necessitating precise computational models for comprehensive biomechanical analysis....

Optimization of Die Profile in Screw Extrusion Process for an Arbitrary Profile by Considering Viscoelastic Effects of the Material

, M.Sc. Thesis Sharif University of Technology Fadaei Naeini, Vahid (Author) ; Asghari, Mohsen (Supervisor)

Abstract

In this thesis, equations related to large deformation of a polymer were derived by considering viscoelastic effects. To express type of material behavior which includes elastoplastic and viscoelastic property at the same time, two-layer viscoplastic model was used. An axisymmetric model was used for modeling problem in finite element software. By derivation of parameters related to two layer model and entering them in finite element software and also entering other properties required to model the forming process, modeling was performed by special profile connecting input and output sections. Due to favorable properties of spline functions, profiles used in die geometry, were selected from...

Synthesis of Composite Coating with HA Nanoparticles on Ti by AC Plasma Electrolyte Oxidation

, M.Sc. Thesis Sharif University of Technology Soleymani Naeini, Masih (Author) ; Ghorbani, Mohammad (Supervisor)

Abstract

In this project, a ceramic biocompatible coating was applied on Titanium which is included Hydroxyapatite by AC Plasma Electrolyte Oxidation method. First, coating was performed in 5 different solutions and various duration in 500mA/Cm2 as a current density. Then, by microscopic and macroscopic images and size of porosity and also thickness of coat, 3 solutions were chosen for adding nanoparticles: Solution 1 which includes NaH2PO4 and Ca(CH3COO)2 , Solution 3 which includes Ca(CH3COO)2 and Na-Beta G and Solution 4 which includes Ca(H2PO4)2, HMP, NA2(EDTA) and Ca(CH3COO)2 . Also the time 10 minutes was chose as a appropriate time. The average of the porosities size in solution 1 was about...

Timetable Optimization and Synchronization in an Urban Subway Network with Stop-Skip Strategy

, M.Sc. Thesis Sharif University of Technology Motavallian Naeini, Homa (Author) ; Shafahi, Yousef (Supervisor)

Abstract

Stop-skipping and timetable synchronization in a transit network for subway operation are two effective strategies to reduce passengers' total travel time.Most of the current research on the topic does not consider stop-skipping strategy and timetable synchronization simultaneously. This paper proposes a mixed-integer programming model based on passenger smart-card data concerning the trains' capacity to minimize passengers' total waiting time and in-vehicle time and maximize the number of passengers who successfully reach their destination. Since increasing the number of trains, stations, or the study horizon, exponentially increase the size of the problem, seeking practical methods to...

Optimal Control of Spacecraft on the Earth-Moon Lagrange Point Orbits considering Sun and other Planets and Elliptic Orbit Perturbations

, M.Sc. Thesis Sharif University of Technology Ghorbani, Mehrdad (Author) ; Assadian, Nima (Supervisor)

Abstract

In this thesis, optimal station keeping of spacecraft on the closed-orbits near the Earth-Moon Lagrange points has been investigated. Lagrange points L1 and L2 are unstable equilibrium points of the circular restricted three-body problem (CRTBP), and periodic orbits near them are the destination of modern missions. However, perturbations resulting from the gravitational forces of the Sun and the planets and the eccentricity of the orbit of the Moon around the Earth make the Lagrange point unstable, even L4 and L5, which are stable in CRTBP. The most suitable choice for spacecraft mission near the collinear Lagrange points is the Halo and other closed-orbits around them, which need...