Emil Sofron

The Fuzzy Model for Aircraft Landing Control

This paper deals the issue of aircraft landing maneuvers from the fuzzy logic perspective. Generally this part of flight needs to be strongly assisted by human pilot. Our purpose is to evaluate the output parameters from a fuzzy system. We have developed a fuzzy control model for three kinematics parameters to do a suitable landing control. We have tried to demonstrate the potential of fuzzy rules based control systems for high precision maneuvers. Features, the approximate reasoning and precision could be simultaneously reached by empirical refining of the fuzzy model. All in all, the result of our work aims to develop the appropriate models for the complete automates of landing process and related tasks.

Programmable cellular automata based encryption algorithm

In this paper, we present a new encryption algorithm based on the programmable cellular automata (PCA) theory. The cryptosystem is featured by its large key space and high speed due to cellular automatapsilas parallel information processing property. Moreover, the encryption and decryption devices share the identical modules, which give appropriate solutions for implementation of the cryptographic modules in high speed applications. So the scheme could be implemented efficiently in hardware, in reconfigurable hardware structures. The design has been implemented in both: in software using C# programming language and in hardware on a XC3S500E FPGA board using VHDL.

Block Encryption Using Hybrid Additive Cellular Automata

With the ever-increasing growth of data communication, the need for security and privacy has become a strong necessity. In these conditions, the necessity of new powerful encryption techniques becomes a crucial issue. In this paper Cellular Automata (CA) are applied to construct cryptography algorithms. We present an encryption system implemented on a structure of Hybrid Additive Cellular Automata (HACA) used for securing the medical data sent over the internet. The experimental results prove the power of cellular automata encryption systems. The method supports both software and hardware implementation. In this paper we present a fully functional software application for the data encryption of multimedia medical content.

FPGA Implementation of Hybrid Additive Programmable Cellular Automata Encryption Algorithm

This paper presents a hardware implementation in a FPGA circuit of an efficient encryption algorithm based on hybrid additive programmable cellular automata (HAPCA). We present a novel approach for a high-speed encryption system prototyped using a single FPGA. The approach is based upon a one-dimensional HAPCA architecture. A regular, modular, and cascadable hardware implementation of the cellular automata encryption algorithm has been implemented, which is efficient in terms of VLSI technology. The encryption algorithm based on the theory of cellular automata was realized using simple digital circuits and memory, and we implemented it on an emulation platform based on FPGA circuit. The experimental results prove the powerful of cellular automata encryption systems. The design has been specified in VHDL targeted on a XILINX XC3S400 based FPGA and verified for functional correctness by software simulation.

Secure TCP/IP communications over DVB-S/DVB-RCS using chaotic sequences

The DVB-S (Digital Video Broadcasting - Satellite) was originally developed as a TV broadcasting protocol. Later on two encapsulation protocols were developed in order to allow network level TCP/IP encapsulation: Multi Protocol Encapsulation — MPE and Unidirectional Lightweight Encapsulation — ULE. This provided a high quality internet access via satellite, which can be multiplexed even with radio and TV transmissions. In this paper, we propose a security system for the ULE based on chaotic sequences for the key management and data encryption. The key management system is based on a multilayer key model. The proposed system provides security services responding to the security requirements of IP over satellite DVB. To quantify the efficiency of the proposed system, we have done a comparative study (theoretically and by simulation) of the data overhead for different transport protocols and different sets of security parameters. Obtained results confirm the efficiency of the proposed system.

FPGA Implementations of Cellular Automata for Pseudo-Random Number Generation

This paper present a hardware implementation in a FPGA circuit of an efficient pseudo-random number generator based on cellular automata. We demonstrate in this paper how microscopic (local) interactions influence the overall macroscopic (global) behavior of the whole system. We highlight the possibility to build the evolutionary systems on such a simple mathematical model as a cellular automata space by introducing the rules of evolution of individuals, their interaction, and their robustness to variations of the model. A regular, modular, and cascadable hardware implementation of the generator has been implemented, which is efficient in terms of VLSI technology. The design has been specified in VHDL targeted on a XC3S400 based FPGA and verified for functional correctness by software simulation

Optimization of partial discharge detection in high voltage cables based on advanced signal processing techniques

In this paper we approach the challenges of partial discharges (PD) detection in high voltage cables using signal processing techniques based on time frequency methods combined with Recurrence Plot Analysis (RPA) and high order spectrum analysis (HOSA). Detection of PD poses many problems in terms of speed of calculation, selection criteria and multitude of causes which lead to the occurrence of PD. In order to overcome these drawbacks, we have developed an algorithm which uses the spectrogram to perform a fast detection of parts from the signal which are susceptible of PD activity. The second stage calculates for each zone a detection curve using the HOSA concept of bispectrum and RPA. The latter has been applied in many non-linear systems in order to characterize the process on the basis of the recurrence matrix obtained from a time series given by the system.

VLSI Implementation of High-Speed Cellular Automata Encryption Algorithm

This paper present a hardware implementation in a FPGA circuit of an efficient encryption algorithm based on cellular automata. We demonstrate in this paper how microscopic (local) interactions influence the overall macroscopic (global) behavior of the whole system. A regular, modular, and cascadable hardware implementation of the encryption system has been implemented, which is efficient in terms of VLSI technology. The experimental results prove the powerful of cellular automata encryption systems. The method supports both software and hardware implementation. The design has been specified in VHDL targeted on a XC3S400 based FPGA and verified for functional correctness by software simulation.

Evaluation of microwave electromagnetic field absorbed by human thyroid gland

Radio communications is spreading more increasingly and people exposure to non-ionizing electromagnetic fields has increased due to emitting antennas. Human beings are complex electrochemical systems that communicate with the environment through electrical pluses. Electromagnetic field penetrates the human body and can alter functions of his cell, tissue and organs by modifying the biochemical processes. People have the ability to physiologically regulate their inner environment to ensure stability in response to fluctuations in the outside environment as a result of homeostasis process if the external sources are less than certain levels. The thyroid gland is one of the most exposed vital organs to electromagnetic radiation. Production of thyroid hormone is essential for metabolism, temperature regulation, and many other vital processes in the body. There are only few published papers reporting the effect of microwave radiation on thyroid. In this generic framework of the electromagnetic smog, that becomes less and less friendly, it is necessary to perform theoretical and experimental studies on the possible field levels that are currently applied to certain body parts. The aim of the present study was to assess the microwave field absorbed by human thyroid gland, and to predict local temperature increase for staff working in the vicinity of antennas transmitting high microwave power, for example on maritime ships. The temperature does not depend linear versus microwave power density. The finite element method was used to solve coupled equations governing the propagation microwave field in different environments with heat generation and propagation. In the paper are presented the necessary specific absorption rates, (SAR), as temperature increases up to 38–43 Celsius degrees for the frequency range between 1 and 4 GHz. Microwave signal power used by ships may lead to increase of 2–4 degrees Celsius.

Field-programmable analog filters array with applications for fuzzy inference systems

Encouraged by the recent progress in the FPAA technology, we propose a flexible membership functions synthesis method based on the configurable filter blocks. Based on the actual paradigm of FPAA we consider an interesting and promising idea to implement the membership functions using the frequency-response curves of the analog filters. The other specific functional blocks can be implemented with programmable analog structures obtaining a complete unit for fuzzy inference processing.