Professor Akbar Adibi's Publications Webpage

Welcome to Professor Akbar Adibi's Publication Page. Here you may find Professor's selected Conference and Journal Papers and also his published books.

PAPERS

PAPER ABSTRACTS:

1- A Novel Implementation of the Hebbian Neurons by Subthreshold MOSFETs in the Presence of Mobile Ions

Abstract:
The 7th Iranian Conference on Electrical Engineering, 17-19 May 1999, Tehran Iran. In this paper we present a novel implementation of a neuron which, actually mimics the behavior of the biological neurons instead of conventional models of a neuron. We first investigate the characteristics of a subthreshold MOSFET in the presence of alkali ion. Alkali ions can move in the gate oxide and cause variation in the threshold voltage and stability in the performance of conventional digital and analogue circuits. According to the Hebbian learning rule, we will use this apparently lamentable property for automatically changing the weights of the synapses. Finally we will propose a novel neuron and investigate this performance.

2- A Proposed Classical Electron Path in Quantum Devices

Abstract:
The 7th Iranian Conference on Electrical Engineering, 17-19 May 1999, Tehran Iran. From uncertainty principle, we know that we can not define a precise path for a quantum particle, such as an electron. However, in spite of the above fact, we need some physical feeling inside the quantum devices, which means, one has to obtain some classical understanding of events occurring inside the devices. In this paper, our goal would be to introduce a classical path for electron in quantum devices with the aid of velocity estimation of electron as a function of space, which would finally lead to a classical path with the properties of electron density and current calculations satisfactorily equal to quantum density and current for electron.

3- A Modern Signature Analysis Using Fuzzy Logic and Neural Network

Abstract:
ICT 96 International Conference on Telecommunications, 14-17 April 1996, Istanbul- Turkey Many different methods have been introduced in pattern recognition so far which can be classified in three major categories: (i) classical neural network (ii) fuzzy logic approach Classical methods including complex statistical algorithms or pure mathematical relations are not sufficiently flexible, on the other hand, neural nets or fuzzy logics based methods, which are flexible approaches possess their own shortcomings. We combined both neural nets and fuzzy logics based criteria to create a robust tool for pattern recognition. In this sense, an intelligent fuzzy system recognizes the bulk of the patterns first and a neural network performs the detailed recognition later. In the first step, the outlook of the patterns are only compared by the fuzzy system which is a low precision process, whereas the neural network has to compare the corresponding parts of the patterns in the second step precisely. Our new approach has been successfully applied to recognize signature patterns with satisfactory results which are figured out later in this paper.

4- Electron Transport in Submicron Semiconductor Devices.

Abstract:
A. Adibi M. J. Sharifi ICEE'98 (Iranian Conference on Electrical engineering) 1998, Tehran Iran. In this paper, we have studied the electron transport in submicron semiconductor devices. The average electron velocity and energy in the device and the rules of different scattering mechanism as the function of device length have been considered. In this study we have found out that the effect of the impurity scattering in short devices will be much more pronounced than the long devices and also it will be possible for electron to reach to a velocity above the ballistic velocity in short devices.

5- Fast Progresses in Semiconductor Technology and Their Effects on Microprocessor Design and Developement.

Abstract:
A. Adibi ,Amirkabir journal of Technology, No.14, 1987, Tehran Iran The construction of microprocessors containing thousands MOS transistors on a single chip is indeed a fact of fast and deep progresses and developments of integrated circuits. In view of these development, microprocessors have been crucially affected in both the design and implementation aspect as well. As an example it took less than 10 years to reach microprocessors from 4 bits to 8 and 16 bits. The capability of minicomputers will be obtainable using 32 and 64 bit processors. In this paper we have shown the correspondence between IC progresses and the relevant microprocessor parameters affected in the design and implementation.

6- Controllable Reflectivity in time domain using nonlinear optics

Abstract:
A. Adibi H. Kaatuzian A. Rostami S. Asrari ICEE'98 (Iranian Conference on Electrical engineering) 1998, Tehran Iran. In this paper we have proposed a new method based on Quarter Wave Multilayer Stack for interpretation of Pulse Narrowing in Nonlinear Optical Systems. In this method we have found that the physical behavior of Dynamic Bragg Filters could be used to describe successfully Pulse Narrowing.

7- Nonclassical Properties of Optical Parametric Interaction Hamiltonian

Abstract:
Akbar Adibi A. Rostami ICEE'98 (Iranian Conference on Electrical engineering) 1998, Tehran Iran. An approach for generation and amplification of squeezed light in optical parametric interaction (OPI) in developed. Coherent state as an initial condition is applied to OPI systems and we show that our proposed approach is very suitable for new computer simulation of this kind. In this paper we have discussed the model properties and have presented the time development of phenomenon in Schrödinger picture. Also, squeezed properties for combined field are derived.

8- A Collection velocity Model for predicting the efficiency of Schottky barrier solar cells

Abstract:
ORDUNG, P. F., ADIBI, A, HEALD, D., & SKALNIK, J.: 'A Collection velocity Model for predicting the efficiency of Schottky barrier solar cells', International Conference on Electricity by means of solar cells, 1977, Luxembourg.

9- A Comprehensive digital protection method in high voltage power systems

Abstract:
ADIBI, A. AGHAJANI, A. & RIAHI, GH.: 'A Comprehensive digital protection method in high voltage power systems',, IEEE Midwest symposium on circuits & systems, 16-18 August 1993, Dettroit Michigan.

10- Macroscopic Method for Generation of Squeezed Light in Nonlinear Optical Fibers

Abstract:
A. Rostami A. Adibi The 7th Iranian Conference on Electrical Engineering, 17-19 May 1999, Tehran Iran. Optical properties of submicron systems are hardly affected from quantum mechanical theory. Furthermore optical integrated circuits are also to be considered in quantum mechanical domain specially optical fibers or waveguides of which we have studied the nonclassical optical properties of linear combination of fields. In this paper we will propose the linear combinations of coherent states (Laser beams) which are applicable in microscopic scale for generation of squeezed light. Also we have tackled the most probable quantum noise problem encountered in OICs. The proposed method will result in a minimum quantum noise level less than the standard quantum limit.

11- A new approach to Gallium Arsenide system design

Abstract:
K. Eshraghian M.L. Paltridge W.S. Blackley D.W. Griffin B.R. Davis A. Adibi. 7th Australian Microelectronics Conference, May 16-18, 1988, Sydney University, NSW Key physical properties of gallium arsenide will lead to ultimate physical performance limits some five times better than silicon based technologies of equivalent geometrical dimensions. This paper considers aspects of the system design of digital gallium arsenide products, reviews some aspects of fabrication of interest to the CAD tool designer, and looks at some results for layout simplification to aid the system designer.

12- Photonic Interpretation for Analyzing - Mesoscopic Devices

Abstract:
Akbar Adibi Hassan Kaatuzian ICT'96 13-17 April, 1996, Istanbul Turkey In this paper we'll consider the physical phenomena in mesoscopic scales. Our physical model which is called 'Photonic' is based on particle nature of light. We've successfully used this treatment to interpret some wave like properties of light. In Cambridge illustrated history of world's science, we read that physics at 18'th century believed light as a stream of particles. In 19'th century they believed it as wave and in 20'th as Wave-Particle Duality. It seems in 21'st century there will be Wave-Particle Unification!

13- A new algorithm for characterisation of a P-N junction diode

Abstract:
ADIBI, A. & Sharifi, M. J.: 'Anew algorithm for characterization of a P-N junction diode', Amirkabir Journal of Technology, No. 27,1995, Tehran Iran.

14- Simulation & design of Organic quantum film of optical switch

Abstract:
ADIBI, A. & KAATUZIAN, H.: 'Simulation & design of Organic quantum film of optical switch.', International Journal of Engineering, fall 1995, Tehran Iran.

15- Fast progresses in Integrated circuit design & fabrication and corresponding improvements of Microprocessors design & development

Abstract:
ADIBI, A.: Fast progresses in Integrated circuit design & fabrication and corresponding improvements of Microprocessors design & development, Amirkabir journal of Technology, No.14, 1987, Tehran Iran.

16- A reduced hardware general purpose systolic array design

Abstract:
ADIBI, A. & BONAKDAR, H.: 'A reduced hardware general purpose systolic array design', IEEE Midwest symposium on circuit & systems, 3-5 August 1994 Lafayette Louisiana.

17- High speed & high precision Digital relays in high voltage power systems

Abstract:
A. Adibi A. Aghajani G. H. Riahi Published in Proceeding of the 35th Midwest Symposium on Circuits and Systems, August 9-12, 1992 Washington, D.C. The probability of fault occurrence and power failures are common in power systems. To prevent damages in accordance with the failure, a fast and reliable protection system is needed in order to initiate proper commands to the actuators in proper time. Since the high voltage power equipments are very expensive, they must be reliably protected against the failures and the protection system must respond as fast as possible. The higher the voltage, the worse the damages and therefore more sophisticated protective relays are of great importance. Our first model based on Linear Prediction (LP) method has been successfully applied to a 400 KV network with satisfactory results. The method will be briefly discussed in this paper for convenience.

18- High speed learning of neural network using fuzzy logic

Abstract:
ADIBI, A., SALEHI, M., HESHMATPANAH, J., BANIARDALANI, S. & FIROOZSHAHI, A.: 'High speed learning of neural network using fuzzy logic', IEEE Midwest symposium on circuit & systems, 16-18 1993 Detroit Michigan.

19- Photonic treatment of refraction angle in submicron optoelectronic devices

Abstract:
ADIBI, A. & KAATUZIAN, K.: 'Photonic treatment of refraction angle in submicron optoelectronic devices', Amirkabir Journal of Technology, No. 27, 1995, Tehran Iran.

20- Flicker noise modeling in GaAs MESFET and its application to phase noise reduction

Abstract:
ADIBI, A. BOOZARY, H. & NAJAFI AGHDAM, E.: 'Flicker noise modeling in GaAs MESFET and its application to phase noise reduction', ICT'95, April 1995, Bali Indonesia.

21- Pulse Narrowing in Nonlinear Optical Systems and QWMS

Abstract:
A. Adibi A. Rostami S. Asrari Proceeding of ICT'98 Conference on Telecommunications, 1998, Greece. In this paper we have proposed a new method based on Quarter Wave Multilayer Stack for interpretation of Pulse Narrowing in Nonlinear Optical Systems. In this method we have found that the physical behavior of Dynamic Bragg Filters could be used to describe successfully Pulse Narrowing.

22- Nonclassical properties of linear combination of coherent states in nonlinear optical fibers

Abstract:
Akbar Adibi A. Rostami Proceeding of ICT'98 Conference on Telecommunications, 1998, Greece. Optical properties of submicron systems are hardly affected from quantum mechanical theory. Furthermore optical integrated circuits have also been considered in quantum mechanical domain specially optical fibers or waveguides of which we have studied the nonclassical optical properties of linear combinations of fields. in this paper we have also tackled the most probable quantum noise problem encountered in OIC's. The proposed method will result in a minimum quantum noise level less than the standard quantum limit.

23- Semiconductor device simulation by a new method of solving Poisson, Laplace & Schrödinger equation

Abstract:
Akbar Adibi A. Rostami International Journal of Engineering, Summer 1999, Tehran Iran. In this paper we have extended and completed our previous work; introducing a new method for finite differentiation. We show a method for solving a wide variety of equations like Poisson, Laplace and Schrödinger equations. These equations are really the heart of most semiconductor device simulators. In a section we solve the Schrödinger equation in several cases, including the problem of finding electron concentration profile in the channel of a HEMT. In another section we solve Poisson equation by this method, choosing the problem of SBD as an example. Finally we solve the Laplace equation in two dimensions, and as an example we focus on the VED. In this paper, we have shown that the method can result in solving all these problems very stably and precisely and also the programs which have used this method become considerably faster, more clear and more abstracted.

24- A Marcov model for FET & eliminating 1/f noise using Kalman filter

Abstract:
M. J. Sharifi A. Adibi IASTED Conference, MIC-98, Switzerland 1998 This paper addresses the low frequency problem in electron device measurements. We introduce, for the first time, a Markov model for FETs and apply a Kalman filter to the model. We have obtained very successful results by solving this model.

25- FWM & Quarter Wave multilayer Stack

Abstract:
ADIBI, A. KAATUZIAN, H. & ROSTAMI, A.: 'FWM & Quarter Wave multilayer Stack', ICT97, 1997, Australia.

26- Squeezed light generation by SHG

Abstract:
ADIBI, A. KAATUZIAN, K. & Rostami, A.: 'Squeezed light generation by SHG', ICT'97, 1997, Australia.

27- Photonic treatment

Abstract:
A. Adibi H. Kaatuzian Optoelectronics, Devices and Technologies, Vol. 10, No. 3, pp. 421, September 1995 In this paper we'll consider the physical phenomena in submicron optical devices. Our physical model is based on the particle nature of light and is called Photonics to estimate the critical angle at the interface between two dielectric media. We haven't used either Electromagnetic theory or Stokes treatment. This is because none of these theories can explain the microscopic phenomena in submicron dimensions or in atomic scales. The treatment is called 'Photonics', because photon particles strikes at the interface region of a crystal with a specified lattice structure and interact step by step with the electrons of atomic layers at the interface. For verification of the model we have used the 'Monte Carlo' method and the results of simulation have confirmed the validity of the Photonics approach to estimate the critical angel in the refraction phenomenon.

28- Optical parametric interaction & squeezed light generation

Abstract:
A. Adibi A. Rostami Proceeding of ICT'98 Conference on Telecommunications, 1998, Greece. An approach for generation and amplification of squeezed light parametric interactions (OPI) is developed. Coherent state as an initial condition is applied to OPI systems and we have shown that our proposed approach is very suitable for computer simulation of this kind. In this paper we have discussed d model properties and also we have presented the time development of phenomenon in Schrödinger picture as well as the derivation of squeezed properties for combined fields.

29- Phase conjugational quarter wave reflectors

Abstract:
A. Adibi H. Kaatuzian A. Rostami ICT'96 13-17 April, 1996, Istanbul Turkey In this paper we have proposed a new method for the calculation of Reflectivity in nonlinear optical phenomenon called Phase Conjugation by Stimulated Brillion Scattering (SBS) which has been developed for Benzene Cell in a form of Quarter-Wave multilayer segments. In this work, we have proposed generalized form of periodic structures for the refractive index in terms of space and time (dynamic periodic structures). This model delivers the precise knowledge for understanding phase conjugation phenomenon based on physical point of view. These calculations have been carried out at the wavelength of 6943 Å.

30- Software lab for semiconductor device characterization

Abstract:
Akbar Adibi A. Rostami 5th IEEE International Conference on Electronics Circuits and Systems, ICECS-98, Lisbon We have developed a software system for training physical; and electrical concept of semiconductor devices and named it 'SLSD' (Software Lab Semiconductor Devices). This work has been done based on two following points: (i) usage of new formulas for finite differentiation. (ii) usage of a matrix form for differentiation operators in different equations By virtue of these, we are able to organize the software system as a software lab that is several small discrete programs that can be jointed by students together in a desired fashion to perform desired simulations. The two main transport models, which are classical models based on Shockley-Red equations and semiclassical model based on Boltzmann equation as well as Schrödinger equation solver and the Laplace solver, has been installed in this lab. One can perform many different experiments in this lab. These experiments cover a wide range of interesting matters in the field of semiconductor devices. We explain six topic experiments in this paper briefly.

31- Organic quantum film optical switch

Abstract:
Organic quantum film optical switch IEEE Telecommunication Conference, Bali Indonesia, April 3-5, 1995.

32- Solution of quantized optical parametric interactions Hamiltonian

Abstract:
Jafarizadeh, M.A., Adibi, A., Rostami, A IL Nouve Cimento part D Volume 20 No. 1, 1998.

33- Dependence of nonclassical behavior of OPI Hamiltonian on the strength of coherence of initial light

Abstract:
M. A. Jafarizadeh, A. Adibi and A. Rostami Indian journal of physics part B Vol. 79, No. 6, December 1989. P. 643 nonclassical properties of optical parametric interaction Hamiltonian (OPI), such as appearance of squeezed states, have been investigated via density matrix formation where the partially coherent lights with Laguerre or Laser distributions have been chosen as initial states. It is shown that the nonclassical behavior of light drastically depends on strength of coherence of initial lights.

34- A New method for quantum device simulation

Abstract:
Akbar Adibi M.J. Sharifi International Journal of Electronics (49), January 17th 1999 This paper introduces a few method for simulation of quantum semiconductor devices. These devices are open systems. We have changed boundary conditions of Schrödinger equation in these devices into two different equations and then introduced a numerical method for solving the equation in a full matrix form. We have applied the method for solving a resonant tunneling diode as an example and introduced several abilities of the method including varying effective mass simulation, complex eigenvalues determination, phase times and dwell times calculation.

35- Photonic Treatment, An Authentic concept

Abstract:
ADIBI, A. & KAATUZIAN, H Optoelectronic-Devices Technologies Vol. 10, No. 3 Japan, September 1995.

36- Generalized model for GaAs MESFET Photodetectors

Abstract:
A. Adibi K. Eshraghian IEEE Proceedings, Circuits, Devices and Systems, Vol. 136, Part G, No. 6, December 1989 The gallium-arsenide MESFET as a ps light-pulse detector has created an environment whereby it is now possible to interface optical fibers and high-speed GaAs analogue-digital circuitry in optical communication links. High switching speed and low operating voltage, together with the optoisolation characteristics of GaAs MESFETs, have resulted in considerable research into uncovering some of the principles that govern the optical characteristics of the GaAs D-MESFET as a photodetector. During the last few years various mechanisms for the photoresponse of MESFETs have been proposed. There include: (i) photoconductivity via the MESFET channel (ii) consideration of the MESFET as a photodiode having only the photovoltaic effect (iii) direct optically induced modulation of the depletion layer, which in essence affects the channel current (iv) electrical modulation of the depletion layer caused by optically generated carriers. Thus there remains considerable controversy with regard to the model of operation of the MESFET as an optical detector. In the paper an effort made to explain the various experimental conditions that resulted in the different conclusions, and subsequently a more complete model is proposed which describes the various modes of operation and provides the basis for comparison between the various proposals .

BOOKS

Theory & Technology of Semiconductor Devices
Digital Electronics
Pulse Techniques

1- Theory & Technology of Semiconductor Devices

Abstract:
1995 Amirkabir University of Technology Tehran Iran.

2- Digital Electronics

Abstract:
It was reviewed & corrected by me in 1992, Academic publication center Tehran Iran.

3- Pulse Techniques

Abstract:
1987 Amirkabir University of technology, Tehran Iran