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innovation
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Technological Capabilities and Knowledge Network Evolution in the Path of Innovation: a Case Study of Knowledge-based Firms
, M.Sc. Thesis Sharif University of Technology ; Maleki, Ali (Supervisor) ; Miremadi, Iman (Co-Supervisor)
Abstract
This Thesis aim to study the evolution of knowledge network in the path of innovation capability accumulation in knowledge-based firms, active in Iran's innovation system as a sanctioned economy. The research, by an in-depth case study and at the micro level, examines the accumulation of capabilities and the evolution of the knowledge networks for two knowledge-based firms active in the manufacture of linear accelerators and cargo-scanners as high-tech products. The results show that 1) the accumulation of capabilities from low levels to advance is based on product diversity and the knowledge inputs, which was first through "using, doing and interacting" has changed to "science, technology...
Heat and Mass Transfer in a Finite Channel
, M.Sc. Thesis Sharif University of Technology ; Saeedi, Mohammad Hassan (Supervisor)
Abstract
The need for cooling and creating thermal comfort conditions for human life is one of today's severe challenges. Therefore, development and innovation to enhance the efficiency of these systems are of great importance. Among the new ideas proposed in this domain, we can mention the M-cycle, which can greatly improve the energy consumption for cooling systems in this sector. In this cycle, the desired cooling is produced by utilizing the latent heat of water evaporation, which is considered a kind of renewable energy. The systems based on this cycle are still under development, and for this reason, there is a necessity to better investigate the heat and mass transfer in the aforementioned...
Causal Analysis of Weak Technological Innovative Capabilities of Digital Transformation in Iran’s Upstream Petroleum Industry
, M.Sc. Thesis Sharif University of Technology ; Maleki, Ali (Supervisor) ; Mirnezami, Reza (Supervisor)
Abstract
Digital technologies are shaping various industries in the era of the 4th industrial revolution, and meanwhile, we are witnessing the faster development of these technologies in the post-Corona period. In the oil industry, digital fields have created a window of opportunity to provide a competitive advantage for reputable oil companies. Realizing the importance of this window of opportunity, the leading oil companies quickly seek to use their capacities in the development of digital technologies such as automation, artificial intelligence, robotics, twins. Digital and fast processing methods are in the context of a digital field to take a step towards digital transformation. National Iranian...
Simplified compute-and-forward and its performance analysis
, Article IET Communications ; Volume 7, Issue 18 , 2013 , Pages 2054-2063 ; ISSN: 17518628 ; Nasiri Kenari, M ; Sharif University of Technology
2013
Abstract
The compute-and-forward (CMF) method has shown a great promise as an innovative approach to exploit interference towards achieving higher network throughput. The CMF was primarily introduced by means of information theory tools. Although there have been some recent works discussing different aspects of efficient and practical implementation of CMF, there are still some issues that are not covered. In this study, the authors first introduce a method to decrease the implementation complexity of the CMF method. They then evaluate the exact outage probability of the authors proposed simplified CMF scheme, and hereby provide an upper bound on the outage probability of the optimum CMF in all...
Evolutionary learning methodology: A case study of R&D strategy development
, Article Technological Forecasting and Social Change ; Volume 80, Issue 5 , 2013 , Pages 956-976 ; 00401625 (ISSN) ; Arasti, M. R ; Hounshell, D. A ; Sahebzamani, S ; Sharif University of Technology
2013
Abstract
This article concerns the notion of methodology in strategic management of R&D/technology. Though development of new tools and methods has received much attention during the recent decades, attention to understanding methodologies has remained disproportionally low. In this study we distinguish two methodologies that are used in strategic management of R&D/technology: planning methodology and evolutionary learning methodology. We mainly focus on defining and describing the origins, nature, and characteristics of the latter. We propose a framework for methodology selection by investigating context, content, and process factors. Using this framework, we provide supportive evidence for...
Energy aware data compression in WSN
, Article Lecture Notes in Electrical Engineering ; Volume 152 , 2013 , Pages 673-682 ; 18761100 (ISSN) ; 9781461435341 (ISBN) ; Manzuri, M. T ; Sharif University of Technology
2013
Abstract
Wireless sensor networks (WSNs) use energy for their sensing, computation, and communication. To increase the lifetime of the network, sensor nodes are equipped with energy storage devices. Recharging of their batteries is not possible in most applications. Therefore, energy consumption needs to be monitored and limited to increase the energy consumption performance of the network. The communication module uses the highest amount of energy in a WSN. 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. This paper illustrates an energy consumption reduction in WSN by...
Using the laser irradiation to improve the rate of production of Iran South West formation
, Article Society of Petroleum Engineers - Kuwait International Petroleum Conference and Exhibition 2012, KIPCE 2012: People and Innovative Technologies to Unleash Challenging Hydrocarbon Resources ; Volume 1 , 2012 , Pages 141-147 ; 9781622769766 (ISBN) ; Habibpour, M ; Jalalyfar, H ; Geranmayehrad, A ; Sharif University of Technology
2012
Abstract
Whole level of the erosion and the resistance of rocks which were composed closured have been studied, besides, the impact of temperature and laser irradiation for more investigation about this issue has been involved before all. This subject more reveals the matter which laser absorption on the laboratory scale using laser to what extent can cause the augment of the relative permeability and secondary porosity of reservoir rock, that of the vertical and horizontal useful connectivity and eventually that of the positive transferability. This research has been carried out in the form of case study on one of Iranian south west formations in north east of Behbahan city in Iran, either the rate...
A model for traffic prediction in wireless ad-hoc networks
, Article Communications in Computer and Information Science ; Volume 241 CCIS , 2011 , Pages 328-335 ; 18650929 (ISSN) ; 9783642273360 (ISBN) ; Manzuri, M. T ; Latifi, N ; Sharif University of Technology
Abstract
In recent years, Wireless Ad-hoc networks have been considered as one of the most important technologies. The application domains of Wireless Ad-hoc Networks gain more and more importance in many areas. One of them is controlling and management the packet traffic. In this paper our goal is controlling the performance of every sections of pipeline of the factory by checking network periodically. Along the factory the traffic is modeled with a Poisson process. We present, with obtaining traffic packets at time (t) for each node in Wireless Ad-hoc Network, we can completely train a Neural Network and successfully predict the traffic at time (t+1) for each node. By this way we can recognize the...
Innovative performance of Iranian knowledge-based firms: Large firms or SMEs?
, Article Technological Forecasting and Social Change ; May , 2016 ; 00401625 (ISSN) ; Bagheri Nasrabadi, M ; Yazdi, N ; Babakhan, A. R ; Sharif University of Technology
Elsevier Inc
2016
Abstract
The debate over innovativeness of large firms and SMEs, which was bolded by Schumpeter, still continues under mixed empirical evidences. There are several implications for this debate including policy orientation in support of large firms or SMEs. But there is a scarce of studies in developing countries and no such study in Iran yet. The present study has explored the proportionality of increase of innovation activity versus firm size within 522 Iranian knowledge-based firms categorized in 9 industries. Innovation activity was measured by R&D expenditure while firm size stood for number of employees. Using log-log regression in the first phase, it was found that R&D expenditure confirms a...
An exponential placement method for materials selection
, Article International Journal of Advanced Manufacturing Technology ; Volume 78, Issue 1-4 , 2015 , Pages 641-650 ; 02683768 (ISSN) ; Aghanouri, A ; Abedian, A ; Milani, A ; Sharif University of Technology
Springer-Verlag London Ltd
2015
Abstract
In this paper, an innovative method is proposed for material selection. This method is based on the well-known weighting properties approach while integrating a new exponential function in the method to overcome the deficiencies of previously proposed methods. Using a maximum and minimum, in each significant aspect of the problem, for scaling, the values of material properties and achieving more realistic results by not emphasizing on any of the high and low extremes and using an exponential function that ranks the candidates regardless of their number, for improving the performance of the methodology and obtaining more absolute rankings, are some of the advantages of this method. The...
On natural based optimization
, Article Cognitive Computation ; Volume 2, Issue 2 , 2010 , Pages 97-119 ; 18669956 (ISSN) ; Sharif University of Technology
2010
Abstract
Nature has always been a source of great inspiration for engineers and mathematicians. Evolutionary Algorithms are the latest in a line of natural-based innovations which have had a profound effect on the application of optimization in science and engineering. Although based on nature, Evolutionary Algorithms are nonetheless distinctly different from natural evolution in several areas. This paper outlines early and recent developments of Evolutionary Algorithms while covering those areas of difference. Practical issues related to the use of Evolutionary Algorithms, key parameters that affect the quality of the search and impact of user choices in problem formulation are also covered in this...
Tolerating more hard errors in MLC PCMs using compression
, Article Proceedings of the 34th IEEE International Conference on Computer Design, ICCD 2016, 2 October 2016 through 5 October 2016 ; 2016 , Pages 304-311 ; 9781509051427 (ISBN) ; Sarbazi Azad, H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
Modern computer systems require fast, large and reliable memories to handle information explosion. With this goal in mind, not only deployment of main memories with new technologies are necessary, but also adopting innovative solutions for addressing newfound challenges must be considered as a priority. Recently, phase change memory (PCM) appeared as a preferred candidate for substituting DRAM. PCM with non-volatility, low static power consumption and storing multiple level cells (MLC) capability has opened a new way to the future of memories. Although PCM presents considerable potentials, its short lifetime is a critical concern. Worse still, adopting multiple bits per cell capability...
Dielectrophoretic cell sorting via sliding cells on 3D silicon microelectrodes
, Article Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 22 January 2017 through 26 January 2017 ; 2017 , Pages 147-150 ; 10846999 (ISSN) ; 9781509050789 (ISBN) ; Chan, M. L ; Roshan, K. A ; Yobas, L ; Sharif University of Technology
Abstract
This work presents an innovative design for a flow-through dielectrophoretic cell sorting based on silicon bulk microelectrodes featuring sidewall undercuts. The microelectrodes are configured into an interdigitated array with digits extending across the flow chamber at an oblique angle against the flow stream. Target cells under dielectrophoretic forces and hydrodynamic drag can slide along the digits to a dedicated outlet. The design has been showcased for continuous-flow sorting of viable and non-viable mammalian cells, achieving a throughput of 16,600 cells/min, an order of magnitude higher than those reported for existing continuous-flow cell sorting designs using thin-film or...
The dynamics of university-industry-government relationships in Nanoscience: investigating the Triple-Helix differences between Iran and Switzerland
, Article Technology Analysis and Strategic Management ; Volume 31, Issue 7 , 2019 , Pages 817-832 ; 09537325 (ISSN) ; Zarghami, H. R ; Sharif University of Technology
Routledge
2019
Abstract
This study aims to find the differences between national and international relationships in Iran and Switzerland’s Nanoscience research between 2008–2015. The results show significant differences some of which are attributed to the general dichotomy of developed-developing countries like stronger University-Industry-Government relations in Switzerland; but others are not, especially those pertaining to bilateral relations. In summary, the Government-Industry relations in Switzerland are generally closer in this field because the emerging characteristics of Nanoscience call for more state intervention, even in the context of developed countries. Greater Government-University relations in Iran...
Recovery of a class of Binary Images from Fourier Samples
, Article 13th International Conference on Sampling Theory and Applications, SampTA 2019, 8 July 2019 through 12 July 2019 ; 2019 ; 9781728137414 (ISBN) ; Zamani, H ; Amini, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
In this paper, we study the recovery of a certain type of shape images modeled as binary-valued images from few Fourier samples. In particular, the boundary of the shapes is assumed to be the zero level-set of a trigonometric curve. This problem was previously considered in [1], and it was shown that such images can be studied withing the framework of signals with finite rate of innovation. In particular, an annihilation filter is introduced to recover the trigonometric boundary curve. It is proved in [1] that 3Λ Fourier samples are sufficient to exactly recover the edges of a binary shape, where Λ is the bandwith of the trigonometric boundary curve. In this paper, we introduce a class of...
A unified formulation of gaussian versus sparse stochastic processes - Part II: Discrete-domain theory
, Article IEEE Transactions on Information Theory ; Vol. 60, issue. 5 , 2014 , pp. 3036-3051 ; ISSN: 00189448 ; Tafti, P. D ; Amini, A ; Kirshner, H
Abstract
This paper is devoted to the characterization of an extended family of continuous-time autoregressive moving average (CARMA) processes that are solutions of stochastic differential equations driven by white Lévy innovations. These are completely specified by: 1) a set of poles and zeros that fixes their correlation structure and 2) a canonical infinitely divisible probability distribution that controls their degree of sparsity (with the Gaussian model corresponding to the least sparse scenario). The generalized CARMA processes are either stationary or nonstationary, depending on the location of the poles in the complex plane. The most basic nonstationary representatives (with a single pole...
Proposal of a new design for valveless micropumps
, Article Scientia Iranica ; Volume 18, Issue 6 , December , 2011 , Pages 1261-1266 ; 10263098 (ISSN) ; Movahhedy, M. R ; Assempour, A ; Sharif University of Technology
2011
Abstract
A new design for a valveless micropumping device has been proposed that integrates two existing pumping technologies, namely, the wall induced traveling wave and the obstacle-type valveless micropump. The liquid in the microchannel is transported by generating a traveling wave on the channel, while the placing of two asymmetric trapezoid obstacles, along the centerline of the channel inlet and outlet, leads to a significant (up to seven times) increase of the net flow rate of the device. The effectiveness of this innovative design has been proved through a verified three-dimensional finite element model. FluidStructure Interaction (FSI) analysis is performed in the framework of an Arbitrary...
Innovative approach to design a new national low speed wind tunnel
, Article International Journal of Environmental Science and Technology ; Volume 6, Issue 1 , 2009 , Pages 23-34 ; 17351472 (ISSN) ; Shojaee, M. N ; Sharif University of Technology
2009
Abstract
A new multipurpose wind tunnel with adjustable test section designed in the science and research branch of Islamic Azad University site could be used either as the environmental, subsonic or climatic wind tunnels. For this purpose, a new design approach was adopted in which through the adjustment of the wind tunnel cycle, i.e. the nozzle of test section,it could be utilized as any of the three wind tunnels. A design used for environmental wind tunnels and other contraction which was adjusted by 50 % through changes in the polynomial contraction for other applications. As a result, the best fitted profile for the environmental wind tunnels contraction was selected by contraction best fit...
Estimation of origin–destination matrices using link counts and partial path data
, Article Transportation ; Volume 47, Issue 6 , 2020 , Pages 2923-2950 ; Shafahi, Y ; Sharif University of Technology
Springer
2020
Abstract
After several decades of work by several talented researchers, estimation of the origin–destination matrix using traffic data has remained very challenging. This paper presents a set of innovative methods for estimation of the origin–destination matrix of large-scale networks, using vehicle counts on links, partial path data obtained from an automated vehicle identification system, and combinations of both data. These innovative methods are used to solve three origin–destination matrix estimation models. The first model is an extension of Spiess’s model which uses vehicle count data while the second model is an extension of Jamali’s model and it uses partial path data. The third model is a...
Using fuzzy logic theory to improve construction productivity
, Article Proceedings, Annual Conference - Canadian Society for Civil Engineering, 10 June 2008 through 13 June 2008, Quebec City, QC ; Volume 1 , 2008 , Pages 585-596 ; 9781605603964 (ISBN) ; Dehghan, R ; Khoramshahi, F ; Sharif University of Technology
2008
Abstract
Fuzzy logic is a powerful problem-solving methodology that provides a remarkably simple way to draw definite conclusions from vague, ambiguous or imprecise information. This study is a review on the possibility of developing a tool to help site managers and planners in selecting the most suitable actions for construction productivity improvement in a complex construction site, using fuzzy logic theory. Improving productivity can have a large impact on the overall construction process and consequently result in significant time and cost savings, i.e. minimizing capital cost on the construction projects. Problems associated with productivity measurement such as "lack of a standard productivity...