Scaling inertia properties of a manipulator payload for 0-g emulation of spacecraft

, Article International Journal of Robotics Research ; Volume 28, Issue 7 , 2009 , Pages 883-894 ; 02783649 (ISSN) Aghili, F ; Namvar, M ; Sharif University of Technology

2009

Abstract

This paper presents a method to control a manipulator system grasping a rigid-body payload so that the motion of the combined system as a consequence of external applied forces is the same as any other free-floating rigid-body (with different inertial properties). This allows 0-g emulation of a scaled spacecraft prototype under the test in a 1-g laboratory environment. The controller consisting of motion feedback and force/moment feedback adjusts the motion of the test spacecraft so as to match that of the flight spacecraft, even if the latter has flexible appendages (such as solar panels) and the former is rigid. The stability of the overall system is analytically investigated, and the...

Design of Novel Drugs Based on Tyrosine and Phenylalanine Amino Acids to Inhibit Cyclin-Dependent Kinases 2 (CDK2) Proteins Modeled on Flavopiridol Drug

, M.Sc. Thesis Sharif University of Technology Aghili, Farshad (Author) ; Fattahi, Alireza (Supervisor)

Abstract

Cyclin-dependent kinases 2 (CDK2) are one of the important proteins in cell cycle regulation and progression. In many human cancer cells, the activity of CDK2 kinases and their related subunits are deregulated, leading to tumor formation. Therefore, inhibition of this enzyme as an attractive therapeutic target can cause cancer cell death in glioblastoma and diffuse large B-cell lymphoma. Using new pharmaceutical structures based on sugar and amino acids is a new approach due to its greater efficacy and fewer side effects than old drugs. In this research, according to the structure of Flavopiridol as one of the CDK2 inhibitors, the active site of CDK2, and the structure of ATP molecule, 50...

Stability Analysis of High Rise Structures Using the IDA Method

, M.Sc. Thesis Sharif University of Technology Aghili, Amir (Author) ; Khaloo, Alireza (Supervisor)

Abstract

The increased height of high-rise structures has made the effects of reduced stability a crucial factor in structural analysis and design. There are a variety of methods for analyzing the stability of high-rise structures. This thesis discusses nonlinear finite element method for analyzing the stability of a three-dimensional 50-storey concrete structure with a height of 150 meter using increment dynamic analysis (IDA). The IDA was first proposed by Bertero.v and it has been adopted in a variety of manners by researchers. In recent years, this method has been confirmed by EEMA. Moreover, FEMA350, FEMA351 and FEMA P695 guidelines have paid special attention to this method for determining...

Attitude control of satellites with delay in attitude measurement

, Article 2013 IEEE International Conference on Robotics and Automation, ICRA 2013 ; 2013 , Pages 947-952 ; 10504729 (ISSN); 9781467356411 (ISBN) Bahrami, S ; Namvar, M ; Aghili, F ; Sharif University of Technology

2013

Abstract

Time delay in attitude sensors is one of the performance limiting factors in controlling the satellite attitude. In this paper, we investigate attitude control of a fully actuated satellite in presence of constant and known delay in attitude measurement. The proposed controller consists of a matrix gain which is computed by solving a time varying matrix differential equation depending on the time delay. We assume that the moment-of-inertia matrix of the satellite is unknown. The controller guarantees asymptotic convergence of the satellite attitude and angular velocity to their desired values in presence of delay. Finally, a simulation example is presented that illustrates performance of the...

Design, Synthesis and Use of Transition Metal Oxide Spinels (Cobalt and Iron) as Catalysts in Organic Reactions

, M.Sc. Thesis Sharif University of Technology Aghili, Sara (Author) ; Matloubi Moghadam, Firouz (Supervisor)

Abstract

Bread scraps with transition metals oxides spinels have been utilized to synthesize¬ magnetic nanocatalyst. The heterogeneous catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA) and transmission electron microscopy (TEM). The reaction was performed for tandem Knoevenagel-Micheal reaction in the presence of synthesized nanocatalyst as a heterogeneous, environmentally benign, cost-effective catalyst with high catalytic activity using EtOH as a green solvent. The magnetic nanocatalyst was applied to synthesize tetraketones and pyranopyrazoles...

Role of Affective Commitment in the Relationship between Ostracism and Turnover Intention

, M.Sc. Thesis Sharif University of Technology Zeytonli, Asiyeh (Author) ; Banki, Sara (Supervisor)

Abstract

A lot of researchers have suggested that ostracism as a disruptive behavior, has been widespread among organizations and a lot of researches has been studied its consequences in recent years.This research studies ostracism’s consequences and proposes a theoretical model of organizational ostracism with affective commitment, intention to turnover and organizational dependability as one of affective commitment’s antecedents. This study has been done on 231 employees of three medium knowledge-based organizations to identify the effects of ostracism on employee’s turnover behavior. Results show that ostracism, due to its impact on the affective commitment of ostracized peoples, reduces this type...

Dynamic mutual manufacturing and transportation routing service selection for cloud manufacturing with multi-period service-demand matching

, Article PeerJ Computer Science ; Volume 7 , 2021 , Pages 1-30 ; 23765992 (ISSN) Sadeghi Aghili, S. A ; Valilai, O.F ; Haji, A ; Khalilzadeh, M ; Sharif University of Technology

PeerJ Inc 2021

Abstract

Recently, manufacturing firms and logistics service providers have been encouraged to deploy the most recent features of Information Technology (IT) to prevail in the competitive circumstances of manufacturing industries. Industry 4.0 and Cloud manufacturing (CMfg), accompanied by a service-oriented architecture model, have been regarded as renowned approaches to enable and facilitate the transition of conventional manufacturing business models into more efficient and productive ones. Furthermore, there is an aptness among the manufacturing and logistics businesses as service providers to synergize and cut down the investment and operational costs via sharing logistics fleet and production...

Distributed Publisher-Subscriber Pattern for Content-Based Routing in Software Defined Networks

, M.Sc. Thesis Sharif University of Technology Aghili, Shahrooz (Author) ; Hemmat Yar, Ali Mohammad Afshin (Supervisor)

Abstract

Content-based routing, as provided by publisher/subscriber systems,has evolved as a key paradigm for interactions between loosely coupled application components (content publishers and subscribers). Content-based routing aims to increase the efficiency of forwarding by utilizing the diversity of information exchanged between application components. Using content-based forwarding rules (also called content filters) installed on content-based routers (also termed brokers), bandwidth-efficiency is increased by only forwarding content to the subset of subscribers who are actually interested in the published content. Many middle-ware implementations for content-based publish/subscribe have been...

Hubert Dreyfus on the Impossibility of Artificial Intelligence: Consequences and Implications

, M.Sc. Thesis Sharif University of Technology Aghili Dehkordi, Bamdad (Author) ; Sefidkhosh, Maysam (Supervisor) ; Taqavi, Mostafa ($item.subfieldsMap.e)

Abstract

Hubert Dreyfus other than being a prominent philosopher is amongst early critics of classical artificial intelligence project which was initialized during 1955-1960. Challenging the rationalist presuppositions of this paradigm, he foresaw various situations where mechanical artificial intelligence based upon modeling the world through symbolic representation and mimicking reason by formalized rules would fail to deliver even remotely similar outputs in digital computers as in human though process and problem solving ability.Twenty years later it became obvious for AI researchers that obstacles like frame problem or lack of common sense would follow their projects no matter what computing...

Dynamic mutual manufacturing and transportation routing service selection for cloud manufacturing with multi-period service-demand matching

, Article PeerJ Computer Science ; Volume 7 , 2021 , Pages 1-30 ; 23765992 (ISSN) Sadeghi Aghili, S. A ; Fatahi Valilai, O ; Haji, A ; Khalilzadeh, M ; Sharif University of Technology

PeerJ Inc 2021

Abstract

Recently, manufacturing firms and logistics service providers have been encouraged to deploy the most recent features of Information Technology (IT) to prevail in the competitive circumstances of manufacturing industries. Industry 4.0 and Cloud manufacturing (CMfg), accompanied by a service-oriented architecture model, have been regarded as renowned approaches to enable and facilitate the transition of conventional manufacturing business models into more efficient and productive ones. Furthermore, there is an aptness among the manufacturing and logistics businesses as service providers to synergize and cut down the investment and operational costs via sharing logistics fleet and production...

Identifying Active Followership Behaviors in Interaction with Managers with Autocratic Leadership Style in an Iranian Organization

, M.Sc. Thesis Sharif University of Technology Ghahremani, Hamed (Author) ; Alavi, Babak (Supervisor) ; Banki, Sara (Supervisor)

Abstract

Purpose: The purpose of this thesis was to identify active followership behaviors of followers in interaction with autocratic leaders. An active follower thinks critically and takes initiatives.
Design: Given that Followership literature is still in its infancy, the research questions needed a qualitative approach, in this case grounded theory. In total, 19 top- & middle-level managers were interviewed as leaders and followers, accordingly, using semi-structured interviews.
Findings: 4 categories of active followership were found, each having 3-4 specific behaviors. These categories are: precautionary behaviors, facilitating behaviors, modificating behaviors, and consolidating...

An Investigation of the Mediating role of Organizational Cynicism on the Relations between the Politics Perception and Organizational Commitment

, M.Sc. Thesis Sharif University of Technology Taleghani, Mohammad (Author) ; Alavi, Babak (Supervisor) ; Banki, Sara (Supervisor)

Abstract

There is no consensus definition of cynicism in literature. In this research different definitions of cynicism have been investigated and two concept of organizational cynicism and trait cynicism have been taken into consideration. Organizational cynicism is a negative attitude that is prevalent in employees. In literature some antecedents and consequences of organizational cynicism have been suggested. It seems organizational cynicism can be investigated in a more complex relations. The focus of this research is on the mediating role of organizational cynicism on the likely relations between politics perception and organizational commitment. That is to say organizational cynicism can...

The Influence of Authentic Leadership on the Relationship between Transformational Leadership, and Feedback-seeking Behaviors

, M.Sc. Thesis Sharif University of Technology Fadaee, Mohsen (Author) ; Alavi, Babak (Supervisor) ; Banki, Sara (Supervisor)

Abstract

Feedback-seeking behavior is the effort of employees to get feedback from the environment and around people about their performance. One of the research questions in this field is about the factors that increase this behavior in the staff. Transformational leadership as a leadership style, stimulates, and motivates followers to achieving desirable operational results. In addition, an important consequence of this style could be increasing the followers' capabilities. Transformational leaders are trying to empower their followers to build and empower them, which can provide a strong incentive for employees to move and grow, which may encourage them to have a better performance. One of...

Applying Gamification in Corporate Entrepreneurship Culture, Specially Missionary Organizations; Through SafirFilm Case Study

, M.Sc. Thesis Sharif University of Technology Jafarian, Hamid Reza (Author) ; Yavari, Elham (Supervisor) ; Banki, Sara ($item.subfieldsMap.e)

Abstract

Although existing literature on organizational culture and its change process contains meaningful and rich theories but our studies show that there is no perfect and detailed framework on linking organizational culture change and corporate entrepreneurship culture. In addition to that, Gamification –defined as taking the game design elements into non-game contexts– is a fruitful and academically rich research area. Fortunately an idea proposed recently to explain a method for enhancements in organizational culture in general, and in corporate entrepreneurship culture in particularby Yavari and Jafarian based on using game mechanisms. In their paper "A Gamification-Based Method for Corporate...

Synthesis of Tin and Ti2n Nanostructured Coatings on Ti alloys Using Magnetron Sputtering System And Comparison of Their Biocompatibility Properties

, M.Sc. Thesis Sharif University of Technology Kalantari Saghafi, Mahsa (Author) ; Nemati, Ali (Supervisor) ; Khamse, Sara (Supervisor)

Abstract

Considering the importance of biocompatibility of implantable prothesis’, metallic alloys have weaker corrosion resistance than ceramics. In order to extend usage of nanomaterials to improve the bio-properties of materials, Nano-structured ceramic coatings are being suggested to improve corrosion resistance and biocompatibility of prosthesis. Meanwhile, very good properties of TiN, such as corrosion resistance and mechanical properties as a thin film coating are undeniable. In this study, TiN and Ti2N thin film were deposited on Ti-based substrate, using PVD and Magnetron sputtering at different argon to nitrogen ratio. The crystal structure of the films was examined using Grazing XRD...

The Instructional Effect of Dynamic-assessment, Non-dynamic Traditional Assesment, and Non-assessment Courses on Iranian EFL Learners' Interlanguage Pragmatic Production

, M.Sc. Thesis Sharif University of Technology Pakzadian, Sara Sadat (Author) ; Tajeddin, Zia (Supervisor) ; Alemi, Minoo (Supervisor)

Abstract

There are several methods proposed for the instruction and assessment of interlanguage pragmatic competence of foreign language learners. Dynamic assessment as one of the recent methods arising from Vygotsky’s sociocultural theory of mind incorporates assessment and instruction by engaging learners in a process of interaction with the mediator while the learners are trying to perform a challenging task. The present study aimed to explore the advantage of Dynamic Assessment as an instructional instrument over the Non-dynamic (traditional) Assessment and Non-assessment approaches and their effects on the Iranian intermediate level students. The target speech acts of apology, complaint, and...

Monitoring of Structure Characteristics, Humidity, Temperature and Torsion Using Optical Fiber Sensor

, Ph.D. Dissertation Sharif University of Technology Esmailzadeh Noghani, Fereshteh (Author) ; Bahrampour, Alireza (Supervisor) ; Tofighi, Sara (Supervisor)

Abstract

Fiber optic sensors have found industrial applications due to their unique characteristics and wide range of environmental parameters. Specifically, distributed optical fiber sensors which have applications in borders protection, intrusion detection, oil and gas leakage detection and smart irrigation of farms and gardens, have attracted significant attention from research groups around the world in recent years. According to the forecasts, among all kind of optical fiber sensors, the temperature and acoustic/vibration sensors will seize the market during the coming years. In this thesis, three kind of optical fiber sensors are proposed for environment health monitoring. First, distributed...

A credible role of copper oxide on structure of nanocrystalline mesoporous titanium dioxide

, Article Journal of the Iranian Chemical Society ; Volume 5, Issue 3 , September , 2008 , pp. 367-374 ; 1735207X Rahimnejad, S. (Sara) ; Rahman Setayesh, S. (Shahrbanoo) ; Gholami, M. R. (Mohammad Reza) ; Sharif University of Technology

2008

Abstract

Copper oxide-titania catalysts with nanocrystalline mesoporous structure were prepared by sol-gel technique using tetra isopropyl ortho titanate (TiPT) as the inorganic precursor and amino-2 ethanol as the swelling agent. Characterization was performed using X-ray diffraction (XRD), fourier transformed infrared spectra (FTIR), scanning electron microscopy (SEM), diffuse reflectance UV-Vis spectroscopy (DRS), and N2 adsorption-desorption measurements. It was found that CuO (0.025-0.1 mol ratio) has some effect on the particle size, surface area, pore-volume, pore-diameter, crystallinity of the particles, and crystalline phase of TiO2 nanocrystalline. The results indicated that 0.1 CuO-TiO2...

Design and Fabrication of Microfluidic Biosensors based on Modified Electrospun Nanofibrous Membranes for Biomarkers Detection

, Ph.D. Dissertation Sharif University of Technology Mahmoudifard, Matin (Author) ; Vosoughi, Manuchehr (Supervisor) ; Soleimani, Masoud (Supervisor) ; Soudi, Sara (Supervisor)

Abstract

The accurate assessment of biomarkers likes proteins, hormones or other biomolecules that amount of them changes with state of disease or level of treatment and gives diagnostic information is a difficult duty. In these samples, pathogens exist in small quantity compared to other background molecules. Therefore, appropriate sampling process for concentrating and separating pathogens from the matrix should be developed in order to provide rapid and accurate pathogen detection test. In this thesis design and fabrication of microfluidic biosensors based on the modified nanofibrous membranes were investigated and explained. PES nanofibrous membrane with carboxyl functional groups for covalent...

Surfactant-assisted synthesis and characterization of hydroxyapatite nanorods under hydrothermal conditions

, Article Materials Science- Poland ; Volume 27, Issue 4 , 2009 , Pages 961-971 ; 01371339 (ISSN) Salarian, M ; Solati Hashjin, M ; Sara Shafiei, S ; Goudarzi, A ; Salarian, R ; Nemati, A ; Sharif University of Technology

2009

Abstract

Hydroxyapatite (HAp) nanorods with uniform morphology and controllable size were successfully synthesized by precipitating Ca(NO3) 24H2O and (NH4)2HPO4 in the presence of cetyltrimethylammonium bromide (CTAB) and polyethylene glycol 400 (PEG 400) as cationic surfactant and non-ionic cosurfactant, respectively, under hydrothermal conditions. The effect of hydrothermal temperature on the composition, morphology and size of HAp particles was studied using X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR) and scanning electron microscopy (SEM). Results revealed that the morphology and size of HAp particles can be effectively controlled by the presence of CTAB and PEG...