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International Review
on Computers and Software - Papers
 Fuzzy
Logic Image Enhancement
by Nur Farahiah,
Shahrizan, Saurdi Ishak, Bibi Sarpinah, Kamaruzaman Jusoff
Vol. 4. n. 4, pp. 440-446
Abstract -
Noise has always plagued
digital imaging and the conventional process of removing noise would
also take some details and textures of the image together. Thus, digital
image processing has always encompassed the needs for the perfect noise
removal filter. A new non-linear uniform and impulse noise removal
filter based on the fuzzy logic branch of Fuzzy Inference Ruled by
Else-Action or FIRE filter is created for that reason. A fuzzy expert
system was incorporated in the filter and thoroughly tested rulebase was
used for the fuzzy inference mechanism. An adaptation of the impulse
noise membership function and a newly proposed uniform noise membership
function was created with meticulous control over all the parameters.
This enables a very detailed optimization and control for the filters to
be achieved, resulting in excellent overall results. Through
optimization and several tests, the filter efficiently removes impulse
and uniform noise while preserving details and textures in images that
are heavily corrupted and totally irrecoverable using linear filters.
Copyright © 2009 Praise
Worthy Prize S.r.l. - All rights reserved
Keywords:
Noise Removal, Fuzzy Logic, FIRE Filter.
Speech
Encryption Using FFT Transform with Enhanced Security
by Djamel
Kehil, Youcef Ferdi, Sahim Kissar
Vol. 4. n. 4, pp. 447-451
Abstract - The
security of speech encryption systems is the major concern in different
applications. In this paper, a new scheme to enhance the security of an
FFT transform based speech encryption system is developed. The main
contribution of this paper is to enhance the security of encrypted
speech using sixteen different permutations to encrypt each sixteen
frames.. This scheme will increase the key space considerably.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Cryptography, Cryptanalysis, FFT Transform, Permutation, Speech
encryption.
Quantum
Protected Software
by L.
Gyongyosi, S. Imre
Vol. 4. n. 4, pp. 452-457
Abstract - In
classical computer science any data that can be read can be copied an
unlimited number of times. In the quantum world, the quantum states
cannot be copied perfectly, according to the no-cloning theorem. In the
proposed method we use quantum states to realize the uncloneable quantum
software. The security the proposed quantum based data protection system
lies in the fundamental difference between classical and quantum
information. The classical data is stored in the secret rotation angles
of non-orthogonal quantum states. The decryption of the stored
information is not possible in classical representation, since the
decrypting mechanism of data qubits is realized by secret unitary
rotations. The absolute security of the proposed quantum software rests
on the laws of quantum dynamics. In our paper we show that the quantum
decoding operations can be implemented with some associated error, which
decreases exponentially with the number of quantum states of the angle
state.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Quantum Software, Quantum Cryptography, Quantum Copy Protection.
by S. Hocine, H.
Belbachir
Vol. 4. n. 4, pp. 458-464
Abstract - In this
paper, we focus on the notion of events in the context of an active
object-oriented database that are the most important research in an
active system.
First, we describe the model of primitive and composite events and
define the algebra permitting to deduct the interval of validity of a
composite event according to their components. Second, we demonstrate
how the synchronized Petri Nets are used as mechanism for the modelling
and detection of composite events. Finally, the architecture of our
model is presented.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Active database, ECA rule, primitive event, Composite event,
Interval of validity, Synchronized PN.
Construction
of Resilient Functions by Modified Siegenthaler’s Construction
by A. Belmeguenaï,
M. Kaddeche, K. Mansouri, N. Derouiche
Vol. 4. n. 4, pp. 465-469
Abstract - The
resilient functions play important role in the construction of symmetric
cryptosystem. In this paper the modified Siegenthaler’s construction
method is considered. This construction permitted to define many more
resilient functions where the degree, algebraic immunity, resiliency and
nonlinearity achieving are high. Thus, permits to build resilient
functions achieving optimum trade-offs between resiliency order,
algebraic degree and nonlinearity (that is, achieving Siegenthaler’s and
Sarkar, al.’s bounds). The paper is concluded by indicating
generalization of our construction to plateaued functions.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Algebraic degree, Algebraic immunity, Boolean functions,
Nonlinearity, Plateaued functions, Resiliency.
A
New Approach Applied to Harmonic Parameters Extraction
by S.
Djelel, M. Benouaret
Vol. 4. n. 4, pp. 470-474
Abstract - This
paper presents, a hybrid method dedicated to extracting the frequency
behavior of a harmonic signal corrupted by white noise, by introducing
the concept of the look-up table combined with the maximum likelihood
estimator. The estimate is based on the data that have been quantified
to a bit per sample and the algorithm adopted in this context consists
of two blocks of look-up tables placed in parallel with maximum
likelihood estimator.
This parallel technique resembles a polyphase filter which can lead to
an implementation on FPGA platforms (programmable Field Gate Array) and
makes it possible to jointly estimate the vector parameter
characterizing the frequential behavior of the harmonic signal to
satisfy the assumption of the local stationnarity.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Harmonic Parameter Estimator, Maximum Likelihood Estimator, FPGA
Development Applications, Look-up Table, CRLB, Non-Linear, Frequency
Estimator.
A
Novel Shape Descriptor Based on Both Local and Global Curve Properties
Using Harmonic State Model
by P. Lionel Evina
Ekombo, Mohammed Oumsis, Mohammed Meknassi
Vol. 4. n. 4, pp. 475-486
Abstract - In this
paper, we propose a new shape descriptor to describe closed curves. This
descriptor is based on both local and global properties of the curve and
uses a Harmonic State Model (HSM). The HSM model is based on the
periodicity hypothesis of the closed contour. It uses the Kalman filter
as the estimation tool. By applying Kalman filter, two state vectors are
derived from the radius and the angle coordinates (with the origin at
the gravity of the contour). A combination of both state vectors helps
to describe the contour under study. From this double vector, we
determine the items of our descriptor. These elements therefore allow
describing both the local and the global aspect of the shape. The local
information is included by a double sign-changes map (positive to
negative, negative to positive) of the vector state elements and the
global parameters are extracted from the vector state. These both
parameters ensure invariance with respect to affine transformations and
a solid description of the contour.
A similarity measure based on the Manhattan distance is defined. This
measure is applied to MPEG-7 shapes database provide good results
comparatively to the references in the area.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Closed curve, Linear state model, Fourier descriptor, Similarity
measure.
A Study of Asymptotic Availability Modeling for a Failure and a Repair
Rates Following a Gamma Distribution
by S. Bahri, F.
Gheribi, H. Ben Bacha
Vol. 4. n. 4, pp. 487-494
Abstract - The
overall objective of the maintenance process is to increase the
profitability of the operation and optimize the availability. However,
the availability of a system is described according to lifetime and
downtime. It is often assumed that these durations follow the
exponential distribution. The work presented in this paper deals with
the problem of availability modeling when the failure and repair rates
are variable. The lifetime and downtime were both governed by models of
Gamma (the exponential model is a particular case). The differential
equation of the availability was formulated and solved to determine the
availability function. An analytical model of the asymptotic
availability was established and proved using numerical simulations. As
results deduced from this study, a new approach of modeling of the
asymptotic availability was presented. The developed model allowed an
easy evaluation of the asymptotic availability. Finally, the asymptotic
behavior of the system is analogous to a system governed by the
exponential model.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Failure Rate, Repair Rate, Gamma Distribution, Asymptotic
Availability.
Comparing
and Contrasting Micro-Payment Models for Mobile Commerce Systems
by O. Ayoade, X.
Dai
Vol. 4. n. 4, pp. 495-503
Abstract - In recent
years, several micro-payment schemes have been proposed for electronic
payment in mobile commerce. However some of these proposed schemes are
not suitable for multiple vendors. Future mobile systems will involve a
large number of users, which will access a variety of information,
services and commodities provided by a range of content providers.
Mobile electronic payment systems must provide a secure, efficient,
usable and reliable environment, which are the key issues in mobile
commerce systems development. Therefore, in order to design an efficient
micro-payment model suitable for mobile commerce systems we compare and
contrast several existing mobile micro-payment models in this paper and
outline a new mobile micro-payment scheme called Mobile-Netpay we have
been proposing that addresses the disadvantages in current schemes.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Micro-payment Protocol, Mobile commerce, Multiple Vendors, Mobile-NetPay.
Quantifying
Quality Operational Costs in a Multi-Agent System for Airline Operations
Recovery
by António J. M.
Castro, Eugénio Oliveira
Vol. 4. n. 4, pp. 504-516
Abstract - When
recovering from operational problems, the Airline Operations Control
Centre (AOCC) usually tries to minimize direct operational costs while
satisfying all the required rules. In this paper we present the
implementation of a Distributed Multi-Agent System (MAS) representing
the existing real-life roles in an AOCC. This MAS includes software
agents that cooperate through a distributed problem solving approach, to
find the best solution for each problem. We propose a general approach
to quantify quality operational costs, so that passengers’ satisfaction
can also be considered in the final decision. We present a real case
study to introduce our approach to quantify the quality operational
costs and solve several real unexpected crew problems. We show that our
MAS with quality costs is able to reduce flight delays and increase
passenger satisfaction without increasing significantly the direct
operational costs. A comparison with two other methods is presented.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Quality Costs, Disruption Management, Airline Operations, Agents,
Multi-Agents.
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