memory
SERIA C
Inginerie Electrică și Informatică
Excelență în Cercetare
Din 1929
Arhiva Online
Ani
NUMERICAL STABILITY OF ADAPTIVE CONTROL ALGORITHMS
person
Ciprian LUPU, Andreea UDREA, Dumitru POPESCU, Cãtãlin PETRESCU
This paper analyzes the impact of modifying the control algorithm parameters by an adaptation low on the immediate variation of the command calculated for an adaptive control structure. A method to limit negative effect of the large command variations due to the adaptation algorithm is proposed....
ANALYSIS OF THE DATA TRANSMISSION IN THE INDUSTRIAL AUTOMATION SYSTEMS
person
Theodor BORANGIU, Marian CROITORU
In this paper is presented a communication protocol designed to the data transfer among the automation systems which include programmable controllers. By introducing an additional bit to identify an address or data byte, reduce the volume of data to be processed by the MCUs slave. Decreasing the...
OPTIMAL LOSS REDUCTION OF DISTRIBUTION NETWORKS USING A REFINED GENETIC ALGORITHM
person
Vlad TUDOR
The network reconfiguration in power distribution systems is realized by changing the status of sectionalizing switches, and is usually done for loss reduction or for load balancing in the system. An optimal loss reduction is obtained to maintain acceptable voltage at customer loads as well as...
PRODUCTION SCHEDULING IN A HOLONIC MANUFACTURING SYSTEM USING THE OPEN-CONTROL CONCEPT
person
Silviu RÃILEANU
Current advances in information technology and electronics allowed the passage from the classic centralized control approach to a fully decentralized control approach. In this context the paper proposes a new control concept in which the commands from a superior control levels are sent as...
GLOBAL SECURITY MODEL
person
Radu PIETRARU
The material aims to present a security model for a particular class of systems, systems connected to the Internet. The originality of the model is hierarchical approach of security on three levels: level stand-alone, level local network and level Internet; and in the selection and presentation...
LOW DISTORTION AND ROBUST STEGANOGRAPHY ON PARALLEL ARCHITECTURE CELL BE USING A SHARED COLOR PALETTE AND A SHARED HASH
person
Bogdan ÃIGÃNOAIA, Francisc IACOB
This paper presents a critical steganographic analysis and a study of the Cell BE architecture. It also describes a new high capacity and robust technique for hiding information on color images. The image distortion after encoding the message is low and indistinguishable to the human eye. The...
CELLULAR AUTOMATA WITH DYNAMICAL LOOP FUNCTION AS NOISE GENERATORS: STATISTICAL ASPECTS (1)
person
Ioan HÃLÃLAE
The present paper is the first study of the evolution of 256 cells linear cellular automata (CA) with global loop and dynamical modification of the rule. We explore the random aspects in the evolution of CA. \r\nFor the definition of randomness we adjusted the one used in the algorithmic...
BUSINESS INTELLIGENCE PERFORMANCE AND CAPACITY IMPACT
person
Codrin POPA
The actual complexity of various organizations with impact in Information Systems reveals that the development of Business Intelligence Systems must be integrated into the wider concept of the Systems Engineering. The whole project should be focus in defining all the requirements and outputs and...
SPATIAL DATA ACQUISITION, MANAGEMENT AND VISUALIZATION IN GEOGRAPHIC INFORMATION SYSTEMS
person
Liliana DOBRICÃ, Traian IONESCU, Leonard DOBRICÃ, Sofia Elena COLESCA
The paper discusses about a developer viewpoint regarding a geographic information system (GIS) software used in geographic data acquisition, management and visualization in a map document. GIS tools can be used effectively to overcome problems such as time consuming, costs or human errors. The...
ZERO-KNOWLEDGE PROTOCOLS IMPLEMENTED WITH ELLIPTIC CURVES
person
Bogdan TUDOR
In this paper ‘zero-knowledge’ protocols are treated in the elliptic curves perspective. The original elementes are the optimization of the algorithms, elliptic curves parameters and the Tate pairing calculus. The algorithms can be treated as a framework and through the distortion...
FPGA IMPLEMENTATION OF VIDEO PROCESSING-BASED ALGORITHM FOR OBJECT TRACKING
person
Dan POPESCU, Dinu PÃTÃRNICHE
In this paper we propose a chromatic-based real-time single object tracking circuit implemented on a FPGA. For object isolation process the Mahalanobis distance is used. The tracking process is divided in two distinct stages: color segmentation and coordinate determination. FPGA circuit...
HIGH-LEVEL METRICS FOR ENERGY EFFICIENCY EVALUATION
person
Marius MARCU, Dacian TUDOR
This paper tries to gather together all the aspects that are important to implement or evaluate energy efficiency techniques in mobile computing devices. The main goal of our work presented in this paper is to propose, implement and validate a set of high-level metrics for energy efficiency...
HYBRID GENO-NEURO SYSTEM FOR OPTIMIZATION OF CONTROL SOLUTION SELECTION IN MULTI MOBILE ROBOTS
person
Fadi ISSA, Ioan DUMITRACHE
In this paper we present a new hybrid system that combines artificial neural networks and genetic algorithms for control solution selection in multi mobile robot systems, since choosing a specific control solution for a robot to execute its required task can affect the performance of other...
CAD - CAM INTEGRATION OPTIMIZING DATA TRANSFER BETWEEN DIFFERENT INTEGRATED DESIGN SYSTEMS IN VIRTUAL ENTERPRISE ENVIRONMENT
person
Carmen Cristiana BUCUR, Traian AURITE
The research results published in this paper are based on a case study for shaft design made for machine tools using four Integrated Design Systems. At the beginning we elaborate the SADT diagram used in CAD/CAM Industry and data transfer. Based on these diagrams we build UML architecture....
FUZZY CONTROL OF AUTONOMOUS MOBILE ROBOT
person
Olumide OBE, Ioan DUMITRACHE
Seamless navigation of autonomous mobile robots in an unstructured, non-episodic and dynamic environment is constrain by imprecision, uncertainty, unreliability, complexity and unpredictability issues that characterize robots’ sensors and its controller. In this paper, we investigate...
GEOMETRICAL REPRESENTATION OF QUANTUM BIT OPERATIONS
person
Lucian DRAGNE
Graphical representations based on geometrical transformations are a very expressive method of simulating the operations performed on quantum information processing systems. Considering a single qubit system, the proofs given in this paper justify the correspondence between a class of operations...
MANY-PROCESSORS & KLEENE’S MODEL
person
Mihaela MALIÃA, Gheorghe M. ªTEFAN
According to [1], [2] more than one processor means multi-processors, while many-processors refers to big-n processors. The theoretical foundation for the two kinds of parallel machines is different and is meaningful for understanding the evolution of computer science in the emerging parallel...
SHAPING SECURITY IN COMMUNICATION INFRASTRUCTURES WITHOUT RESTORING IN CASE OF MALFUNCTION
person
Gheorghiþã PESCARU
This paper is an attempt to analyze the likelihood of calculating an overall security coefficient for a given communication infrastructure that can be used in various communication services, such as e-healthcare, e-government, or other similar services. The assumption is that providing (certain)...
FIREWALL POLICY MANAGEMENT USING SECURE WEB SYSTEM
person
Daniel GHEORGHICÃ, Victor CROITORU
In recent years firewalls have seen some impressive technological advances (e.g. stateful inspection, transparency, performance, etc.) and wide-spread deployment. In contrast, firewall and security management technology is lacking. In this paper we propose a secure web system for firewall policy...
ASPECTS REGARDING NUMERICAL MODELING OF INDUCTIVE HEATING PROCESS FOR LOW VOLTAGE ELECTRICAL CABLES
person
Costel PÃUN
In this paper is presented an algorithm for numerical modeling of inductive heating process for low voltage electrical cables.The results will be used in studies of cables electrical isolation proprieties. It is possible to do a correlation between thermal effect on cables isolation, produced by...
EVALUATION AND DESIGN OF A SHIELDING SCREEN
person
Daniela CÃZÃNARU, Andrei SZILAGYI
This paper describes a work covering some aspects of the electromagnetic compatibility (EMC) design optimization of a shield for a informatic equipment. Based on the presented simulations, the authors stress that the shielding structure has an own resonance frequency, the value of it is...
EFFECTS OF IONIZING RADIATION ON THE DIELECTRIC PROPERTIES OF LDPE-AL2O3 NANOCOMPOSITES
person
Florin CIUPRINA, Traian ZAHARESCU, Silviu JIPA, Ilona PLEªA, Petru V. NOÃINGHER, Denis PANAITESCU
The goal of this paper is to study the irradiation effects on the dielectric behaviour of a polymer nanocomposite dielectric made of low density polyethylene filled with nanoparticles of Al2O3. The permittivity and tan delta values were determined by dielectric spectroscopy over a frequency...
DISCRETE RESISTIVE MODELS FOR MULTI-RATE ANALYSIS OF INTEGRATED ANALOG CIRCUITS
person
Catalina-Gabriela POPESCU
For the nonlinear circuits with widely-separated time scales it is used the analysis in multi-time variables because the traditional analysis is very difficult. By applying this approach the differential algebraic equations describing the nonlinear analog circuits driven by multi-tone signals...
MODELING DYNAMIC HIGH INTENSITY DISCHARGE LAMP CHARACTERISTICS
person
Florin Ciprian ARGATU, Costin CEPIªCÃ
This paper proposes a model curve-fitting approach for modeling HID lamps voltage–current characteristics based on measured lamp voltage and current. The lamp conductance is considered as a series of piecewise cubic polynomials that describes the nonlinear voltage-current characteristic of...
DISK-ROTOR SERVOMOTOR FED BY AN AC/DC CONVERTER
person
Ana-Maria DUMITRESCU, Anca STAN, Dragoº DEACONU, Aurel CHIRILÃ, Valentin NÃVRÃPESCU, Mihaela ALBU, Gianfranco CHICCO
In the paper the mathematical model of a disk-rotor servomotor is presented along with that of a AC/DC converter. The identification method used for the motor\\\\\\\'s electro-mechanical parameters is also presented. Finally, a comparison between the simulated data and experimental results along...
ANALYSED TRANSIENTS DURING ISLANDING OPERATION OF ONE HPP ON ITS AUXILLIARIES
person
Ioniþã DAESCU, Cãlin MUCICHESCU, Basarab GUZUN, Daniel MORAR
The present work is aiming to study the significant dynamic behavior of one hydro power generator HG from one hydro electric power plant HPP, together with one electric motor ME from its internal network of auxiliaries, in the event of a sudden load rejection that follows one normal running...
A NOTE ON ROUGH SET THEORY APPLICATIONS IN POWER ENGINEERING
person
Ioana PISICÃ
Rough Set theory, proposed by Zdzislaw Pawlak in 1982, has proved to be an adequate technique in imperfect data analysis, which has found interesting extensions and various applications. It can be regarded as complementary to other theories that deal with imperfect knowledge, such as or fuzzy...
ETUDE EXPERIMENTALE DE LA GAZEIFICATION DES DECHETS DE BOIS
person
Rãzvan VÃJEU, Victor ATHANASOVICI
This work is dedicated to the experimental study of wood waste gasification using a specially designed pilot staged gasifier. The drying/pyrolysis, partial oxidation and reduction stages are physically separated into distinct reactors. Temperature and gas composition measurements allow the...