ABSTRACT A tool for simulation and modeling of wired/wireless computer net-works based on Cellula... more ABSTRACT A tool for simulation and modeling of wired/wireless computer net-works based on Cellular Automata (CAs), is presented. More specifically, a two-dimensional NaSch CA model for computer network simulation has been developed and implemented in the proposed tool. Furthermore, algorithms for connectivity evaluation, system reliability evaluation and shortest path compu-tation in a wired/wireless computer network have also been implemented. The Net_CA system was designed and developed as an interactive tool that offers automated modeling with the assistance of a dynamic and user friendly graphi-cal environment. The simulation algorithms developed in the present work offer high flexibility. Furthermore, connection reliability and other important pa-rameters are inputs to the algorithms rendering Net_CA a very reliable and fast simulator for wireless networks, ad hoc networks and, generally, for low con-nection reliability networks.
2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353)
Recent advances in electronic technology integration coupled with increasing needs for more servi... more Recent advances in electronic technology integration coupled with increasing needs for more services in portable communications favors the development of high performance dual-mode terminals. We present the complete architecture implementation of the GMSK/GFSK modulator/demodulator including the FIR filters design. The main features of the modulator/demodulator and the architectural implementation of FIR filters are described. The interface with ASPIS processor and
The continuous miniaturization and the increased complexity of today's integrated circuits h... more The continuous miniaturization and the increased complexity of today's integrated circuits has led to a demand for faster simulation algorithms for physical processes. A method for designing a dedicated processor, which executes a cellular automaton (CA) algorithm that simulates the selected locally interacting system or physical process, using a genetic algorithm (GA), is described in this paper. An application example of the proposed method namely forest fire spreading is also presented. Starting from a CA with continuous state space which simulates the physical process, each time, the GA is used to find a CA with discrete state space, having the smallest possible lattice size and the smallest possible number of discrete states, the results of which are as close as possible to the results of the CA with continuous state space. The dedicated processor that executes the discrete CA algorithm was designed to the level of a silicon compiler output. This processor can be used as a...
The concept of hybrid in space-time Cellular Automata is introduced, for the first time, in this ... more The concept of hybrid in space-time Cellular Automata is introduced, for the first time, in this paper, and it is suggested that non-linear hybrid in space-time Cellular Automata can be used as pseudorandom pattern generators for VLSI systems, because they can produce patterns with various densities of “1”, distributed at will in space and time. The cycle lengths of non-linear hybrid Cellular Automata can be estimated using Lyapunov exponents.
... Two cells in its neighbourhood are etched (white cells). (b) After some time, the (i, j) cell... more ... Two cells in its neighbourhood are etched (white cells). (b) After some time, the (i, j) cell will be partially etched. 'LVWDQFH RQ ZDIHU P 'HSWK P (a) ... 100 Page 5. Effects of photoresist roughness and defects on developed profiles 'LVWDQFH RQ ZDIHU P 'HSWK P (a) ...
... the periphery of the array receive a constant input 1 from the connection facing the boundary... more ... the periphery of the array receive a constant input 1 from the connection facing the boundary. ... reached, then the output of the array of AND gates is "1" and the counter stops. ... 7. CONCLUSIONSA new algorithm for the determination of the mean velocity of a moving object, using ...
A tested, verified, and calibrated lithography simulator, based on cellular automata, is used to ... more A tested, verified, and calibrated lithography simulator, based on cellular automata, is used to study phenomena, the effects of which are becoming more pronounced as the integrated circuits (ICs) are pushed deeper into the nanometre region. Lithography profiles developed on non-planar Si surfaces, where a step or a sloped line is present, were studied. Numerical experiments that elucidate effects such
Modelling and Simulation in Materials Science and Engineering, 1997
ABSTRACT A neural network for the simulation of photolithographic resist exposure process is prop... more ABSTRACT A neural network for the simulation of photolithographic resist exposure process is proposed for the first time. The model is constructed by means of a feed-forward neural network, using the back-propagation training method. The training can be done with only a few experimental measurements with satisfactory output results. This neural network is compared with the ABC parameter model, which is currently in use; it is found to produce exactly the same results, but it is much faster because of the parallel structure of neural networks. Finally, this neural network for the resist exposure simulation is integrated with a cellular automaton model for the resist etching simulation. This integrated neural network/cellular automaton model is successfully used for the simulated production of some standard photolithographic profiles.
ABSTRACT A tool for simulation and modeling of wired/wireless computer net-works based on Cellula... more ABSTRACT A tool for simulation and modeling of wired/wireless computer net-works based on Cellular Automata (CAs), is presented. More specifically, a two-dimensional NaSch CA model for computer network simulation has been developed and implemented in the proposed tool. Furthermore, algorithms for connectivity evaluation, system reliability evaluation and shortest path compu-tation in a wired/wireless computer network have also been implemented. The Net_CA system was designed and developed as an interactive tool that offers automated modeling with the assistance of a dynamic and user friendly graphi-cal environment. The simulation algorithms developed in the present work offer high flexibility. Furthermore, connection reliability and other important pa-rameters are inputs to the algorithms rendering Net_CA a very reliable and fast simulator for wireless networks, ad hoc networks and, generally, for low con-nection reliability networks.
2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353)
Recent advances in electronic technology integration coupled with increasing needs for more servi... more Recent advances in electronic technology integration coupled with increasing needs for more services in portable communications favors the development of high performance dual-mode terminals. We present the complete architecture implementation of the GMSK/GFSK modulator/demodulator including the FIR filters design. The main features of the modulator/demodulator and the architectural implementation of FIR filters are described. The interface with ASPIS processor and
The continuous miniaturization and the increased complexity of today's integrated circuits h... more The continuous miniaturization and the increased complexity of today's integrated circuits has led to a demand for faster simulation algorithms for physical processes. A method for designing a dedicated processor, which executes a cellular automaton (CA) algorithm that simulates the selected locally interacting system or physical process, using a genetic algorithm (GA), is described in this paper. An application example of the proposed method namely forest fire spreading is also presented. Starting from a CA with continuous state space which simulates the physical process, each time, the GA is used to find a CA with discrete state space, having the smallest possible lattice size and the smallest possible number of discrete states, the results of which are as close as possible to the results of the CA with continuous state space. The dedicated processor that executes the discrete CA algorithm was designed to the level of a silicon compiler output. This processor can be used as a...
The concept of hybrid in space-time Cellular Automata is introduced, for the first time, in this ... more The concept of hybrid in space-time Cellular Automata is introduced, for the first time, in this paper, and it is suggested that non-linear hybrid in space-time Cellular Automata can be used as pseudorandom pattern generators for VLSI systems, because they can produce patterns with various densities of “1”, distributed at will in space and time. The cycle lengths of non-linear hybrid Cellular Automata can be estimated using Lyapunov exponents.
... Two cells in its neighbourhood are etched (white cells). (b) After some time, the (i, j) cell... more ... Two cells in its neighbourhood are etched (white cells). (b) After some time, the (i, j) cell will be partially etched. 'LVWDQFH RQ ZDIHU P 'HSWK P (a) ... 100 Page 5. Effects of photoresist roughness and defects on developed profiles 'LVWDQFH RQ ZDIHU P 'HSWK P (a) ...
... the periphery of the array receive a constant input 1 from the connection facing the boundary... more ... the periphery of the array receive a constant input 1 from the connection facing the boundary. ... reached, then the output of the array of AND gates is "1" and the counter stops. ... 7. CONCLUSIONSA new algorithm for the determination of the mean velocity of a moving object, using ...
A tested, verified, and calibrated lithography simulator, based on cellular automata, is used to ... more A tested, verified, and calibrated lithography simulator, based on cellular automata, is used to study phenomena, the effects of which are becoming more pronounced as the integrated circuits (ICs) are pushed deeper into the nanometre region. Lithography profiles developed on non-planar Si surfaces, where a step or a sloped line is present, were studied. Numerical experiments that elucidate effects such
Modelling and Simulation in Materials Science and Engineering, 1997
ABSTRACT A neural network for the simulation of photolithographic resist exposure process is prop... more ABSTRACT A neural network for the simulation of photolithographic resist exposure process is proposed for the first time. The model is constructed by means of a feed-forward neural network, using the back-propagation training method. The training can be done with only a few experimental measurements with satisfactory output results. This neural network is compared with the ABC parameter model, which is currently in use; it is found to produce exactly the same results, but it is much faster because of the parallel structure of neural networks. Finally, this neural network for the resist exposure simulation is integrated with a cellular automaton model for the resist etching simulation. This integrated neural network/cellular automaton model is successfully used for the simulated production of some standard photolithographic profiles.
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Papers by A. Thanailakis