Low power encoding in NoCs based on coupling transition avoidance

, Article 12th Euromicro Conference on Digital System Design: Architectures, Methods and Tools, DSD 2009, 27 August 2009 through 29 August 2009 ; 2009 , Pages 247-254 ; 9780769537825 (ISBN) Taassori, M ; Hessabi, S ; Sharif University of Technology

2009

Abstract

Coupling capacitances between adjacent wires in on-chip interconnects significantly affect the amount of power consumption in Ultra-Deep-Submicron technologies. On the other hand, the propagation delay across global on chip interconnects has increasingly become a limiting factor in high-speed design. Crosstalk between adjacent links on the bus contributes a significant portion of this delay. Crosstalk noise also affects the integrity of signals. Decreasing the coupling transitions can improve the side effects of crosstalk noise. We propose an algorithm to minimize the coupling activity transition. We also introduce a new solution to fit the proposed algorithm for Network-on-Chip (NoC)...

Reducing Power Consumption in NoCs Through Adaptive Data Encoding

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

Abstract

Recent advances in VLSI technology have led to integrate a few billion transistors on a chip. Systems on Chip provide solutions to the design problems of these systems. As technology scales down to deep sub-micron dimensions, the delay and power consumption of global interconnects become the major bottleneck in SoC design. Networks on Chip (NoCs) have been proposed as an efficient, scalable, modular and reliable solution to provide on chip communication in large VLSI design. The market trend to mobile digital systems and battery-powered devices add power as a new dimension to VLSI design space in addition to speed and area. Interconnect wires dissipate a significant fraction of power...

MFLP: a low power encoding for on chip networks

, Article Design Automation for Embedded Systems ; Volume 20, Issue 3 , 2016 , Pages 191-210 ; 09295585 (ISSN) Taassori, M ; Taassori, M ; Uysal, S ; Sharif University of Technology

Springer New York LLC 2016

Abstract

Network on chip (NoC) has been proposed as an appropriate solution for today’s on-chip communication challenges. Power dissipation has become a key factor in the NoCs because of their shrinking sizes. In this paper, we propose a new encoding approach aimed at power reduction by decreasing the number of switching activities on the buses. This approach assigns the symbols to data word in such a way that the more frequent words are sent by less power consumption. This algorithm dedicates the symbols with less ones to high probability data and uses transition signaling to transmit data. The proposed method, unlike the existing low power encoding, does not rely on spatial redundancy and keeps the...

The Course of Martin Heidegger’s Notion of Science in His Early Thought,Based on Works Preceding Being and Time

, M.Sc. Thesis Sharif University of Technology Heshmati, Ata (Author) ; Sefidkhosh, Meysam (Supervisor)

Abstract

In this research, first of all, the main question of Heidegger and his epoch is investigated. If we read Heidegger along the tradition of German philosophy, then it is perceived that the problem of science is the most central subject matter standing against Heidegger. My question is this: how Heidegger reaches to this existential phenomenological view about science. Regarding that, by giving a coherent narration about a crucial problem called 'the crisis of science', in the first chapter I gave a short view to philosophies preceding Heidegger, some important of which is Dilthey's philosophy of life, phenomenology of Husserl, and south-west school of neo-Kantianism. The second chapter...

Explaining Moral Role of Artifacts With Regards to Value Laden Theory of Technology

, M.Sc. Thesis Sharif University of Technology Hosseinpour, Hesam (Author) ; Sefidkhosh, Meysam (Supervisor) ; Taghavi, Mostafa (Supervisor)

Abstract

In this thesis we review different approaches to the theory of value laden technology and realize that there are at least two major ideas about this. Some philosophers believe that technology is not a mere instrument and has a value laden nature. In contrast some others count technology as something neutral which contains no social or moral value. After explaining this ideas, in the second chapter we examine different models which explain the relation between technology and moral and social values and show how this values can contribute in design and use of technologies. In chapter three we talk about different methods used to steer technology in a desirable way which is in accordance with...

On the Topological Entropy of Geodesic Flows

, M.Sc. Thesis Sharif University of Technology Reshadat, Zahra (Author) ; Razvan, Mohammad Reza (Supervisor) ; Nassiri, Meysam (Supervisor)

Abstract

Let M be a connected, compact, Riemannian manifold. Geodesic flow is a flow on the unit tangent bundle of M . This flow can be studied in dynamics prespective. for example entropy or complexity of the geodesic flow. in this thesis we will follow methods of entropy estimation or computing for geodesic flow. we will follow the method of anthony manning and Ricardo Mañe for proving such result. Maning present two results linking the topological entropy of the geodesic flow on M. we expalin how he find exponential growth rate volume of balls in universal cover as a lower bound for topologycal entropy. another theorem , Mañe represent the equlity between exponential growth rate of avrage of...

Classification of Partial Hyperbolic Diffeomorphisms on 3-manifolds

, M.Sc. Thesis Sharif University of Technology Tahuri Turki, Ata (Author) ; Safdari, Mohammad (Supervisor) ; Nassiri, Meysam (Supervisor)

Abstract

In this dissertation, we will study partially hyperbolic diffeomorphisms. First, we are going to introduce partially hyperbolic diffeomorphisms and construct some examples. One of the important questions in the study of partially hyperbolic diffeomorphisms is their classification problem, which provides a deeper understanding of manifolds and also of partially hyperbolic diffeomorphisms themselves. We will go through this problem by examining Hammerlindl, Potrie’s [1]’s work. They have proved that a partially hyperbolic diffeomorphism on a 3-manifold with a virtually solvable fundamental group, that has no periodic torus tangent to contraction-center or expansion-center, is dynamically...

OPAIC: An optimization technique to improve energy consumption and performance in application specific network on chips

, Article Measurement: Journal of the International Measurement Confederation ; Volume 74 , 2015 , Pages 208-220 ; 02632241 (ISSN) Taassori, M ; Taassori, M ; Niroomand, S ; Vizvári, B ; Uysal, S ; Hadi Vencheh, A ; Sharif University of Technology

Elsevier 2015

Abstract

Abstract Network on Chip (NoC) is an appropriate and scalable solution for today's System on Chips (SoCs) with the high communication demands. Application specific NoCs is preferable since they can be customized to optimize all requirements of the specific applications. This paper presents an OPtimization technique for Application specifIC NoCs (OPAIC), which aims not only to decrease the energy consumption but also to improve the area of NoCs. OPAIC is composed of three stages to find the optimum NoC; in the first stage, it uses a linearized form of a Quadratic Assignment Problem (QAP) to map tasks on cores to minimize the energy. In the second stage, a Mixed Integer Linear Problem (MILP)...

Strictly Toral Dynamics

, M.Sc. Thesis Sharif University of Technology Talebi, Amin Sadat (Author) ; Esfahanizadeh, Mostafa (Supervisor) ; Nassiri, Meysam (Supervisor)

Abstract

This dissertation deals with nonwandering (e.g. area-preserving) homeomorphisms of the torus which are homotopic to the identity and strictly toral, in the sense that they exhibit dynamical properties that are not present in homeomorphisms of the annulus or the plane. This includes all homeomorphisms which have a rotation set with nonempty interior. There are two types of points: inessential and essential. It is known that the set of inessential points Ine(f ) is a disjoint union of periodic topological disks ("elliptic islands"), while the set of essential points Ess(f ) is an essential continuum, with typically rich dynamics ("the chaotic region"). One of the key results in this context is...

Stationary Measures on Homogeneous Spaces

, M.Sc. Thesis Sharif University of Technology Rajabzadeh, Hesameddin (Author) ; Haji Mirsadeghi, Mir Omid (Supervisor) ; Nasiri, Meysam (Supervisor)

Abstract

Let be a sub-semigroup of SL(d;Z) which acts strongly irreducible on Rd, i.e. there is not any invariant finite union of nontrivial proper subspaces of Rd. acts on Td by homeomorphisms. We will show that under these assumptions every infinite invariant subset of Td under the action of is dense in Td. For instance, if x is a point in Td which is not rational, then x = Td. In this thesis, we will follow the method of Y. Benoist and J.F. Quint for proving such results. Their method is to prove some kind of rigidity for the stationary measures for the action of on Td. Actually, every atomless stationary measure is the lebesgue measure on Td which is invariant under all the elements of...

Buckling Analysis of Reinforced Composite Conical Shells under Axial Compressive Load using GDQ Method

, M.Sc. Thesis Sharif University of Technology Gholami, Peyman (Author) ; Kouchakzadeh, Mohammad Ali (Supervisor) ; Shakouri, Meysam ($item.subfieldsMap.e) ; Noghabi, Mohammad ($item.subfieldsMap.e)

Abstract

The object of this study is to determine the buckling load of reinforced composite conical shells under axial compression. . Shells are reinforced by stringers and rings and the boundary conditions are assumed to be simply supported. At first the equilibrium equations are obtained using the first order shear deformation theory (FSDT), smeared stiffener technique and principle of minimum potential energy. In the following, the resulting equations which are the system of five variable coefficient partial differential equations in terms of displacement components are investigated by generalized differential quadrature method (GDQM). Finally the standard eigenvalue equation is formed and the...

Non-statistical Dynamical Systems

, Ph.D. Dissertation Sharif University of Technology Talebi, Aminosadat (Author) ; Razvan, Mohammad Reza (Supervisor) ; Nassiri, Meysam (Supervisor) ; Berger, Pierre (Supervisor)

Abstract

Non-statistical dynamics are those dynamical systems for which a large subset of points in the phase space (positive measure subset) have non-statistical behavior, meaning that the orbit of these points does not have asymptotic distribution in the phase space. We introduce two new classes of these kinds of dynamics: non-statistical rational maps on the Reimann sphere and non-statistical Anosov-Katok maps of the annulus. We then give a general formalization of the notion of "statistical (in)stability" and show how it is connected to the existence of non-statistical dynamics in a general family of maps

Investigation of Operating Parameters for Thorium Adsorption from Wastewater by Using of Radiated Grafting Polymeric Adsorbents in Packed Bed Column

, M.Sc. Thesis Sharif University of Technology Kazzazi, Sina (Author) ; Outokesh, Mohamad (Supervisor) ; Torab Mostaedi, Meysam (Supervisor) ; Asadollahzadeh, Mehdi (Co-Supervisor) ; Torkaman, Rezvan (Co-Supervisor)

Abstract

Today, the pollution of heavy metals in wastewater and surface waters, which is a global environmental problem, has increased with the expansion of various industrial activities. Heavy metals cause serious health problems due to their accumulation in human and animal tissues. Thorium, is a radioactive element with an atomic number of 90 that is widely used in the optics, aerospace, metallurgy and chemical industries, in the manufacture of high-strength alloys, in UV photocells, and especially in the nuclear industry. The primary sources of radioactive wastewater include nuclear power plants, nuclear energy industry research centers, medical institutions, industrial production, universities,...

Synthesis and Characterization of Polymer Nanofibers Modified by Using of Radiated Grafting for Adsorption of Molybdenum Ions from Aqueous Solution

, M.Sc. Thesis Sharif University of Technology Fayazi, Mohammad Reza (Author) ; Outokesh, Mohammad (Supervisor) ; Asadollahzadeh, Mehdi (Supervisor) ; Torkaman, Rezvan (Co-Supervisor) ; Torab Mostaedi, Meysam (Co-Supervisor)

Abstract

Molybdenum is one of the important elements of the intermediary metal with atomic number 42, which is used in various industries, but among the important uses of this metal in the nuclear industry, we can mention the presence of this element in the production of yellow cake as an impurity and also as a precursor for the production of radiopharmaceuticals. It is one of the impurities that remain in all stages of yellow cake production along with uranium, and the high presence of this element causes the centrifuges to become unbalanced during the injection of "U" "F" _"6" gas, and on the other hand, technetium, the main ingredient in the production of radiopharmaceuticals, It comes from the...