"Annals. Computer Science Series" Journal
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Ovidiu Crista
Updating:
Tiberiu Marius Karnyanszky
Editor-in-Chief
Annals. Computer Science Series
Tome 12, Fasc. 2


ISSN: 1583-7165 (printed journal)
ISSN: 2065-7471 (e-journal)
Owner: "Tibiscus" University of Timişoara, România
Editor: Mirton Publishing House of Timişoara, România
Distributor: "Tibiscus" University of Timişoara, România
Appearance: December 2014


» Optimization of an Economic and Environmental Dispatching Power using the Bacterial Foraging Optimization Algorithm (BFOA)

» Mohamed Amine Larbi Chaht and Mostefa Rahli

ABSTRACT:

This paper proposes the application of a method based on the Algorithm Bacterial Foraging Optimization (BFOA) for the study of an environmental economic Dispatching (EED). We will optimize the non-linear function of the cost of fuel necessary for the production of electric power and function of the gas emissions toxic gas from the plants and determine the active powers to generate these functions are under some types equality and inequality constraints. Our approach is performed on a standard network IEEE 30bus. Numerical results indicate that the proposed algorithm is in most cases more active than other meta-heuristique or deterministic methods.

KEYWORDS:

Optimization, Economic and Environmental Dispatching, Bacterial Foraging Optimization Algorithm (BFOA).

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» Robust Factor based Anomaly Detection in Hierarchical Wireless Sensor Networks

» Barakkath Nisha U., UmaMaheswari N., Venkatesh R. and Yasir Abdullah R.

ABSTRACT:

To improve data reliability, accuracy and to make effective and correct decisions using data collected from the wireless sensor network, it is necessary to detect the inconsistent data (outlier) caused by compromised or malfunctioning nodes. Data aggregation is augmented to eliminate the outlier data in the sensor network by multivariate analysis technique such as factor analysis and mahalanobis distance. Factor analysis is a way to fit a model to multivariate data to estimate the interdependence. In a factor analysis model, the measured variables depend on a smaller number of unobserved (latent) factors. The mahalanobis distance is used to determine the similarity of a set of values from an unknown samp1e to a set of values measured from a collection of known samples. Combined with factor analysis, Mahalanobis distance is extended to examine whether a given vector is an outlier from a model identified by factors based on factor analysis. In this paper to ensure accuracy during the aggregation process, factor analysis and mahalanobis distance methodologies are used and the data inconsistency is optimized. The performance graph shows that the Factor analysis and mahalanobis distance detects outlier better than the principal component analysis and subspace methods.

KEYWORDS:

Aggregation, Distance Measure, Factors, Outlier, Sensor Network.

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» Analyse de la stabilite transitoire d’un reseau multimachines par la theorie des catastrophes

» Lahouaria Benasla, Abderrahim Belmadani and Mostefa Rahli

ABSTRACT:

L’étude de la stabilité transitoire est une tâche fondamentale car l’évaluation rapide de celle-ci est une exigence importante pour l’évaluation du comportement dynamique des réseaux électriques.
Ce comportement est décrit par des équations différentielles dont la résolution nécessite la résolution du problème de l’écoulement de puissance pour la détermination des conditions initiales. Différentes méthodes, comme la méthode de Gauss-Seidel, de Newton-Raphson et de Newton-Raphson découplée rapide sont utilisées pour résoudre le problème de l’écoulement de puissance.
Des informations dans le domaine des études de la stabilité peuvent être aussi connues en appliquant la théorie des catastrophes. Cette dernière détermine la zone de stabilité dans le plan de contrôle du système, montrant que si le point opérationnel se déplace en dehors de la limite de la stabilité qui est déterminée par la théorie des catastrophes, le système doit être instable et vice-versa.
L’estimation du temps d’élimination du défaut par la technique de catastrophe est purement mathématique et directe. Cette technique se base dans son calcul sur les résultats de l’écoulement de puissance avant, pendant et après élimination du défaut.
Dans cet article, nous avons appliqué la méthode de Gauss-Seidel pour résoudre le problème de l’écoulement de puissance, la méthode d’Euler modifiée pour résoudre les équations différentielles décrivant le comportement du réseau, avant, pendant et après la perturbation et la théorie de catastrophe, sur un réseau à deux machines. Se basant sur l’équation Swallowtail, nous avons pu évaluer la stabilité transitoire de chaque machine.

KEYWORDS:

Stabilité transitoire, temps critique, méthode de Gauss-Seidel, méthode d’Euler modifiée, théorie des catastrophes.

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» Performing a simple Pendulum Experiment as a Demonstrative Example for Computer Experiments

» Kazeem A. Osuolale, Waheed B. Yahya and Babatunde L. Adeleke

ABSTRACT:

A computer experiment is an experiment conducted using data obtained from a computer model or simulator in lieu of the physical process. A physics-based experiment known as a simple pendulum experiment was performed as a demonstrative example for a computer experiment. A true model called a simulator or a computer model of a simple pendulum was used to mimic a real life pendulum experiment.The inputs to the computer code were varied in order to determine the effect of different inputs on the output(s). The outputs of such computer model or simulator served as a proxy for the real life observations of the study. Our interest in this study is to determine the output which is the time it takes the bob of a pendulum to return to rest. This time is also called the stoppage time in this research. MATLAB 2012a computer package (www.mathworks.com/) was used for the development of the program that generates the time it takes the pendulum to return to rest.

KEYWORDS:

Computer experiment, Simulator, Simple Pendulum, output, Stoppage time.

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» Defending against wormhole attack in Multi-hop Wireless Mesh Networks

» Parimalla Subhash and Sirandas Ramachandram

ABSTRACT:

In Wireless Mesh Networks (WMNs), many of the existing routing protocols are vulnerable to various types of attacks. One such attack that causes severe impact on a wireless mesh network is the Wormhole attack. Wormhole attack is a type of tunneling attack, in which the network messages are captured at one end and transmitted to other end through a low-latency link called virtual tunnel. In this paper, we propose a security mechanism to defend against byzantine wormhole attack on Hybrid Wireless Mesh Protocol (HWMP), which is a mandatory path selection protocol in multi-hop wireless mesh networks. The investigated mechanism prevents the formation of wormholes during the route discovery phase in an on-demand routing protocol of WMNs. Analysis and simulation of the proposed mechanism are performed in Omnet++,a discrete event network simulator. The proposed solution is simple and software based, it does not require each node in the network to be equipped with a specialized hardware.

KEYWORDS:

Byzantine Wormhole attack; Wireless Mesh Networks; HWMP; Security Mechanisms.

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» An Algorithm for Constructing Symmetric ((r+1)v, kr, kλ) BIBDs from Affine Resolvable (v, b, r, k, λ) BIBDs

» Kazeem A. Osuolale and Oluwaseun A. Otekunrin

ABSTRACT:

This work deals with the construction of symmetric ((r+1)v, kr, kλ) BIBDs from affine resolvable (v, b, r, k, λ) BIBDs. A MATLAB program was written to construct resolution and parallel classes from ((4, 6, 3, 2, 1) and (9, 12, 4, 3, 1) affine resolvable designs. A technique was thereafter used, via the MATLAB program to obtain their corresponding incidence matrices which gave rise to symmetric ((r+1)v, kr, kλ) BIBDs. The two SBIBDs ((16, 6, 2) and (45, 12, 3) constructed obeyed the mathematical property of a symmetric matrix and this makes the technique employed in this research unique since the terminology SBIBD does not imply true mathematical symmetry.

KEYWORDS:

Affine Resolvable BIBDs, MATLAB Program, Incidence Matrices, Symmetric BIBDs and Symmetric Matrix.

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» Design of Noise Injector using Instrumentation Amplifier for High Efficiency Sensor Applications

» Neeraj Agarwal, J. N. Roy, Deep Sahgal and Neeru Agarwal

ABSTRACT:

In this paper, issues related to noise sensor application of instrumentation amplifier through substrate coupling are described and established with the physical phenomenon responsible for its formation, coupling transmission method and media, factor affecting coupling strengths and its impact on mixed signal integrated circuits. Basic aim is to find out magnitude of interference happening when analog and digital circuit is placed nearby on a common substrate. It has been design to have a broad bandwidth (1 KHz to 1MHz) with very high CMRR to cancel out the unwanted noise at its both inputs and deliver single output. MOSFET capacitors are used for the picking of substrate interference. Advantages and disadvantages of the design are also discussed.

KEYWORDS:

CMOS, noise sensor, Substrate Coupling, Guard Banding.

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» Design & Simulation of Low Power Analog to Digital Converter for Medical Applications

» Neeru Agarwal, B. Prasad, S. C. Bose and Neeraj Agarwal

ABSTRACT:

Analog to Digital converters (ADC) are key design blocks in modern communication systems for high efficiency medical applications. In this work, a design of Analog to Digital converter for pressure sensor application has been presented. The main purpose of this research is to develop an accurate system block for measuring temperature signals. This work presents a new circuit architecture concept with implementation of circuit blocks. This architecture uses a modified dynamic comparator for comparing a supplied analog input voltage and a reference voltage. This work proposed different technique to implement low power, high-resolution A/D converter that can be used for biomedical applications and does not employ any component trimming or adjustment. There may be less power dissipation because this proposed ADC needs only one additional operational amplifier and a comparator compared to traditional one A/D architecture. This architecture is simulated at 0.35µ tsmc technology using Mentor Graphics tool at 3.3V power supply. Advantages and disadvantages of the architecture are discussed. Simulated results matched the proposed techniques.

KEYWORDS:

pressure sensor, sensor network, data converter, operational amplifier, power efficiency, enabling technologies.

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» A Statistical Survey upon the Evolution of the Students’ Satisfaction Regarding the Educational Process

» Tiberiu Marius Karnyanszky and Corina Muşuroi

ABSTRACT:

This papers bases on the specifications of the Romanian Agency for Quality Insurance in Higher Education (ARACIS) regarding the assessment of the B.Sc. programs. Some of our prior works are also presented in order to substantiate our solution, focusing on the automation of the statistical calculus. The paper presents an expert system implemented at the “Tibiscus” University of Timisoara, Romania, used for at least five years to analyze the quality assessment of the educational process, compulsory made by the students at our university using an online web-based application. The results of the analysis and of the statistical processing are used on departments, assuring a transparent policy of the educational high education evaluation. Our application allow the evaluation, the interpretation, the study of the evolution and the history of the results of evaluation, using statistical indicators as the average, the mean squared deviations, the class values, the correlations and others. A widely implementation of our solution permits to have the same evaluation system in all universities and, by consequence, a unitary insight to the higher education level.

KEYWORDS:

quality assessment, high education, statistical processing, means, deviation, correlations.

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