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The strong tracking innovation filter
, Article IEEE Transactions on Aerospace and Electronic Systems ; Volume 58, Issue 4 , 2022 , Pages 3261-3270 ; 00189251 (ISSN) ; Ahmadvand, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
Sliding innovation filter (SIF) has recently been introduced as a robust strategy for estimation of linear systems. The SIF has been extended to nonlinear systems via analytical linearization. However, as the performance of the extended SIF (ESIF) degrades in the presence of severe nonlinearities, this article has initially developed a derivative-free cubature SIF (CSIF) that uses statistical linearization for the error propagation. In addition, the SIF gain has been reformed to incorporate the innovation covariance matrix, thus reducing the estimation error. Furthermore, the adaptive fading factor has been employed to strengthen the robustness and convergence properties of the CSIF against...
Adaptive Estimation of Satellite Attitude via an Entropy Approach
, M.Sc. Thesis Sharif University of Technology ; Pourtakdoust , Hossein (Supervisor) ; Kiani, Maryam (Supervisor)
Abstract
Nonlinear state estimation algorithms developed based on Bayesian framework have been increasingly utilized in space navigation and attitude estimation to enhance the mission performance. However, successful implementation of these algorithms requires accurate knowledge of process and measurement noise statistical properties. As the satellites experience various systematic and environmental uncertainties on orbit, no priori information of noise characteristics is usually available. In this regard, adaptive estimation algorithms have been widely utilized to tune the planned noise properties according to the variable working conditions. Among various adaptation methods, innovation-based...
Statistical Interpolation of Non-Gaussian AR Stochastic Processes
, M.Sc. Thesis Sharif University of Technology ; Amini, Arash (Supervisor)
Abstract
white noise or an innovation process through an all-pole filter. Applications of these processes include speech processing, RADAR signals and stock market data modeling. There exists an extensive research material on the AR processes with Gaussian innovation, however studies about the non-Gaussian case have been much more limited, while in many applications the asymptotic behavior of the signal is non-Gaussian. Non-Gaussian processes have an advantage over Gaussian ones in being capable of modeling sparsity. Assuming an appropriate non-Gaussian innovation one can suggest a more realistic description of sparse signals and predict their behavior or estimate their unknown values successfully....
DS-CDMA Acquisition Using Adaptive Filters and Sampling at the Rate of Innovation
, M.Sc. Thesis Sharif University of Technology ; Aleam Marvasti, Farrokh (Supervisor)
Abstract
In modern wireless mobile telephony networks, DS-CDMA based physical layers has gained much attention due to their ease of implementation at relatively low overall cost, ability to provide high speed data services, increased user capacity, and many other outstanding features. One of the challenges facing these systems is the synchronization of the users’ signature codes (received via communication channel) to the receiver’s locally generated replica, as the only distinguishing feature between users in such systems is the pseudo-orthogonal properties of these signature codes. To fully utilize this orthogonality, all sequences need to have a common time reference. But when relative sequence...
Feasibility Study of Manufacturing of Disposable Plant Containers
,
M.Sc. Thesis
Sharif University of Technology
;
Mostafavi, Mostafa
(Supervisor)
Abstract
Although laws vary in the competitive business world of today and the changing supply and demand parameters show that the process of delivering new products to market is very important.Most organizations today have found that spending more than ever on trusting in traditional competitive levers such as quality, cost reduction and differentiation in selling more products and services are not enough to be successful in market, instead notions such as speed, flexibility andagility can have a significant trend toward offering new products and services. There aresome good reasons for knew that organizations need new ways to develop their new products to survival, compete with its competitors and...
Applying Gamification in Corporate Entrepreneurship Culture, Specially Missionary Organizations; Through SafirFilm Case Study
, M.Sc. Thesis Sharif University of Technology ; 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...
Conceptual Developments in the Evolution of Innovation Systems Approach
,
Ph.D. Dissertation
Sharif University of Technology
;
Kermanshah, Ali
(Supervisor)
Abstract
The systemic approach to innovation plays a central and somewhat unifying role within the field of innovation studies. The main tenets of the approach were developed during the last decades of twentieth century by a bunch of researchers who were tackling with the problem of the economic nature of innovation and its role in growth and competitiveness. The innovation systems approach spread out rapidly throughout the globe and established itself as a framework for studying and policy making in academia and national and supranational organizations. This vast and fast expansion, however, was accompanied by a set of critical contemplations on the theoretical soundness of the approach and also by...
Evaluating the Effectiveness of Supportive Innovation Policies on New Technology-Based Firms’ Success in Reaching the Growth Stage
, M.Sc. Thesis Sharif University of Technology ; Miremadi, Iman (Supervisor) ; Vesal, Mohammad (Supervisor)
Abstract
New technology-based firms (NTBFs) are the driving force behind creating innovation and technology in countries and can play a crucial role in job creation and economic growth. These companies also facilitate technology transfer and strengthen the absorptive capacity of national innovation systems. Therefore, given the externalities of these companies, as well as their significant role in promoting innovation, governments around the world implement policies to support these firms. In Iran, the Vice President for Science and Technology has implemented policies to support NTBFs since 2013. Recently, a few studies have been carried out to evaluate these policies. However, the number of these...
Knowledge Sharing in Project-based Organizations Case Study: Kayson Inc
, M.Sc. Thesis Sharif University of Technology ; Isaai, Mohammad Taghi (Supervisor) ; Sepehri, Mehran (Supervisor)
Abstract
A company's knowledge is one of its most valuable assets. In this regard, project-based companies operating temporarily with constantly changing project members try hard to manage their knowledge, an important asset that also provides them with a competitive advantage. One of the biggest challenges of project-based organizations is how to facilitate the processes of sharing knowledge which enables the organization to capture and implement its knowledge successfully. In this study, the governance mechanisms of innovation ecosystems are used to support the effective use of knowledge-sharing mechanisms across projects and subgroups of the organization.This study analyzes Kayson holding as its...
Knowledge Sharing in Project-based Organizations Case Study: Kayson Inc
, M.Sc. Thesis Sharif University of Technology ; Isaai, Mohammad Taghi (Supervisor) ; Sepehri, Mehran (Supervisor)
Abstract
A company's knowledge is one of its most valuable assets. In this regard, project-based companies operating temporarily with constantly changing project members try hard to manage their knowledge, an important asset that also provides them with a competitive advantage. One of the biggest challenges of project-based organizations is how to facilitate the processes of sharing knowledge which enables the organization to capture and implement its knowledge successfully. In this study, the governance mechanisms of innovation ecosystems are used to support the effective use of knowledge-sharing mechanisms across projects and subgroups of the organization.This study analyzes Kayson holding as its...
Analyzing Narrative Policy Framework of Innovation Policy in Development of Iran’s Innovation Ecosystem
, M.Sc. Thesis Sharif University of Technology ; Maleki, Ali (Supervisor)
Abstract
The development of innovation ecosystems has become a global trend. These ecosystems have proven their importance to governments by having a significant impact on the creation of technology companies and the economic growth of the country. In Iran, too, for many years, efforts have been made under various headings to develop the innovation ecosystems. In this dissertation, based on the narrative policy framework, the existing policy narratives of innovation ecosystems development policy in iran between 2013-20 years in the case of startup ecosystem have been analyzed. After analyzing these data, it was found that the three main narratives of catch-up, wealth creation and infiltration, have...
Technological Capabilties, Generating Value-added and Upgrading in Global Value Chains: Evidence from Developing Countries
, M.Sc. Thesis Sharif University of Technology ; Miremadi, Iman (Supervisor) ; Madanizadeh, Ali (Supervisor)
Abstract
Today, global value chains(GVCs) have distributed the production of goods and services all over the world and have become the main part of global trade. GVCs provide developing countries with oppurtunities for engaging in economic activity and producing goods, without developing all the infrastructure needed for producing it yourself. but participating in GVCs also pose some challenges to developing countries. if developing countries do not enhance their ability for generating value-added, by losing the advantage of cheap labour over time, they will fall into the so-called "middle-income trap". therefore upgrading, with the broad definition of generating more value-added, should be targeted...
Recovery of Binary Images from Samples of the PSF-Blurred Images
, Ph.D. Dissertation Sharif University of Technology ; Amini, Arash (Supervisor) ; Marvasti, Farrokh (Co-Supervisor) ; Fakharzadeh, Mohammad (Co-Supervisor)
Abstract
One of the main challenges in image processing is the reconstruction of images from their samples in the discrete domain to obtain high quality images in the continuous domain. Visual signals in the continuous domain are usually represented by discrete or digital images. This reconstruction process may not be possible in general, and we need to set some specific constraints for this purpose, such as delimiting the signal bandwidth. In this dissertation, we consider the reconstruction of binary images (black and white). These images have infinite bandwidth due to the existence of edges, and thus, the conditions of the Nyquist-Shannon sampling theorem do not hold. Novel methods have been...
A synergistic program between engineering and business schools towards medical technology commercialization
, Article IEEE TENSYMP 2014 - 2014 IEEE Region 10 Symposium ; 14- 16 April , 2014 , pp. 456-461 ; ISBN: 9781479920280 ; Gan, K. B ; Chellappan, K ; Ali, M. A. M ; Mustafa, M. M ; Sharif University of Technology
Abstract
Governments in developing countries have invested in institutions of higher learning in order to develop homegrown, high technology products. Among these, the National University of Malaysia (Universiti Kebangsaan Malaysia), recognized as a Research University, is actively involved in projects related to medical technology through its various faculties. The net result of these activities is impressing from the point of view of patents and publications, but unfortunately not yet in terms of commercialization. This paper starts by presenting the main obstacles towards the objective of bringing a laboratory prototype to the market in the context of Malaysia. Then, a framework is presented...
Energy consumption text and image data compression in WSNs
, Article Lecture Notes in Electrical Engineering ; Volume 152 LNEE , December , 2013 , Pages 683-695 ; 18761100 (ISSN) ; 9781461435341 (ISBN) ; Manzuri, M. T ; Sharif University of Technology
2013
Abstract
Wireless sensor networks (WSNs) consume energy for their sensing, computation, and communication. To extend the lifetime of the network, sensor nodes are equipped with energy storage devices. Recharging of their batteries is impossible in most applications. Therefore, energy consumption needs to be monitored and limited to extend the high performance operation of the network. In this network, the communication module consumes the highest amount of energy. This paper demonstrates that among several methods offered to reduce the energy consumption, data compression has the highest effect on the energy usage by reducing the number of bits to be broadcasted. To determine the energy efficiency of...
Spectral estimation by computationally reduced Kalman Filter
, Article Circuits, Systems, and Signal Processing ; Volume 31, Issue 6 , 2012 , Pages 2205-2220 ; 0278081X (ISSN) ; Rasouli, M ; Behnia, F ; Sharif University of Technology
2012
Abstract
This paper introduces an innovative frequency estimation approach that relies on a new and innovative structure for Kalman Filter (KF) in signal processing. Kalman Filtering, because of its state estimating nature, excels other methods in realtime processing. However, the main drawback of Kalman Filtering is that it involves time-consuming matrix operations which makes it inferior to faster methods like fast Fourier transform (FFT). The most evident privilege of the new structure is that it "synthesizes" the components rather than "extracts" them as standard Kalman Filter does. This parallel synthesis of signal components reduces the computational order of the Kalman Filter dramatically. In...
Branch and bound algorithms for resource constrained project scheduling problem subject to cumulative resources
, Article Proceedings - 2011 4th International Conference on Information Management, Innovation Management and Industrial Engineering, ICIII 2011, 26 November 2011 through 27 November 2011, Shenzhen ; Volume 1 , 2011 , Pages 147-152 ; 9780769545233 (ISBN) ; Shadrokh, S ; Sharif University of Technology
Abstract
Renewable and nonrenewable resources are the most studied resource types in the field of resource-constrained project scheduling problems, however cumulative resources are another type of resources, widespread in practical cases that have been theoretically studied much less than the two aforementioned types. So in the current paper we study resource-constrained project scheduling problem subject to cumulative resources (RCPSP-Cu), focusing on development of exact algorithms for the problem. We customize three resource-constrained project scheduling problem (RCPSP) branch and bound algorithms of extension alternatives, minimal delaying alternatives and minimal forbidden sets for RCPSP-Cu. We...
Exact solution to free vibration of beams partially supported by an elastic foundation
, Article Scientia Iranica ; Volume 18, Issue 4 A , 2011 , Pages 861-866 ; 10263098 (ISSN) ; Mofid, M ; Alanjari, P ; Sharif University of Technology
Abstract
This study pertains to the free vibration problem of beams on an elastic foundation of the Winkler type, which is distributed over a particular length of the beam. Closed form solutions are developed by solving the governing differential equations of beams. Moreover, an innovative mathematical approach is proposed to find the precise analytical solution of the free vibration of beams with mixed boundary conditions. Results are discussed in detail through verification studies. Ultimately, it was concluded that the proposed mathematical method could successfully obtain the exact solution to the free vibration problem of beams on partial elastic foundations under mixed boundary conditions
SER of M-PSK modulation in incremental-selective decode-and-forward cooperative communications over Rayleigh fading channels
, Article International Conference on Advanced Communication Technology, ICACT, 13 February 2011 through 16 February 2011 ; February , 2011 , Pages 432-437 ; 17389445 (ISSN) ; 9788955191554 (ISBN) ; Saadat, R ; Aref, M. R ; Mirjalily, G ; Sharif University of Technology
2011
Abstract
In this paper we consider a cooperative communication systems over Rayleigh fading channels. The system utilizes a combination of incremental and selective decode-and-forward (ISDF) relaying protocols. The symbol error rate (SER) of M-PSK modulation for the ISDF protocol is derived. Using an approximation of the SER expression, the optimal power allocation is investigated. In order to reduce the complexity of the receiver, we used a modified version of the ISDF protocol which does not use the storage or retransmission of the first phase signal. We also derived optimal power allocation coefficient for modified ISDF. It has been noted that for the optimal power allocation in the ISDF protocol,...
An approach for the estimation of aggregate potential telecommuting demand
, Article International Journal of Engineering, Transactions A: Basics ; Volume 24, Issue 4 , 2011 , Pages 331-340 ; 17281431 (ISSN) ; Ardeshiri, A ; Sharif University of Technology
Abstract
Development of technology has made possible the invention of innovative and modern methods to partially solve the problems caused by traffic congestion through decreasing the need for physical transportation; one such method being telecommuting. Although, research has been conducted to model employees' and employers' attitude towards telecommuting at micro levels, few predictions have been reported regarding its aggregate demand at the macro level of a city, generally because of the complexity and multi-dimensionality of the subject. In this paper, an approach for the estimation of potential aggregate telecommuting demand is proposed to partly fill the gap in the literature; and applied for...