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International Review on
Computers and Software - Papers
Semantic Web: A State of the
Art Survey
by D. N. Kanellopoulos, S. B. Kotsiantis
Abstract
- The semantic web is an extension of the current web in which information is
given well-defined meaning. It is a concept that enables better machine
processing of information on the web, by structuring documents written for the
web in such a way that they become understandable by computers. This can be used
for creating complex applications such as intelligent browsers, intelligent
software agents, global databases with data from the web, reuse of information,
etc. Central to the vision of the semantic web are ontologies. Ontologies
provide a shared understanding of a domain of interest to support communication
among human and software agents, typically being represented in a machine-processable
representation language. Web ontology languages like OWL provide a technological
basis to enable the semantic web. This paper considers the basic principles of
the semantic web, and reviews important tools for creating and maintaining
ontologies in various frameworks.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
metadata, ontology, semantic web.
A Three-layer Framework for Querying Heterogeneous Information Sources Based on
Ontology Mapping
by S. M. Benslimane, M. Malki, A. Merazi, D. Amar Bensaber
Abstract
-
Ontology is increasingly
seen as a key factor for automatic processing of machines, and interoperability
between heterogeneous information systems. Ontology mapping is becoming a
crucial aspect in providing the background knowledge required for solving
heterogeneity problems between semantically described data sources, and
accessing distributed information repositories. Developing such ontology mapping
has been a core issue of recent ontology research. In this paper we present a
three-layer framework to (semi-)automatically discovering and using ontology
mapping. We show how such resulting mapping is used for resolving semantic
interrogation tasks, and enabling runtime semantic interoperability across
heterogeneous information systems using semantic web technologies.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Ontology mapping, Semantic Web, Semantic interoperability, Similarity measures.
A
State-of-the-art Review on Quantum Information Computing
by R. Ku. Jena, P. K. Mahanti
Abstract
- The subject of quantum computing brings ideas from classical information
theory, computer science, and quantum physics. Quantum mechanics provide new
computational paradigms that had not been imagined prior to the 1980's and whose
power was not fully appreciated until the mid 1990's.This review aims to
succinctly summarize not just quantum computing, but the whole subject of
quantum information theory.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Quantum Computing, Quantum Communication, Quantum Computers, Quantum Network,
Quantum Cryptography.
RARAN: Authenticated Routing for Ad Hoc Networks Protocol with Reputation
by A. Sameh, A. Mahmoud, S. El-Kassas
Abstract
- The field of MANETs is rapidly growing and changing. While there are still
many challenges that need to be met, it is likely that such networks will see
widespread use within the next few years. One of these challenges is security.
Security of mobile ad hoc networks has recently gained momentum in the research
community. Due to the open nature of ad hoc networks and their inherent lack of
infrastructure, security exposures can be an impediment to basic network
operation and countermeasures should be included in network functions from the
early stages of their design. In this paper, we analyze one of the secure mobile
ad hoc networks protocols, which is Authenticated routing for ad hoc networks (ARAN).
Such protocol is classified as a secure reactive routing protocol, which is
based on some type of query-reply dialog. That means ARAN does not attempt to
continuously maintain the up-to-date topology of the network, but rather when
there is a need, it invokes a function to find a route to the destination. Here,
we detail the security attacks that the ARAN protocol defends against, criticize
how an authenticated selfish node can disturb the network by dropping packets or
by not cooperating in the routing functionality and propose a reputation-based
scheme called Reputed-ARAN to detect and defend against selfish nodes. The
solution presented in this thesis only covers a subset of all threats and is far
from providing a comprehensive answer to the many security problems in the
MANETs field.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Mobile Ad hoc Networks, Routing Security, ARAN, Malicious nodes, Selfish nodes,
Reputation-based Schemes.
by A. Al-Nassiri, S. A. Abdulla, R. A. Salam
Abstract
- A successful Arabic character recognition system improves interactivity
between the human and the computers in many applications such as: digital
archiving of ancient Arabic manuscripts, check verification, and documents
analyzing. In spite of this fact, Arabic character recognition has not received
enough research. The goal of automating character recognition can not be
achieved without solving the segmentation problem. The cursive nature, rotation,
strokes variety, and character slanting of Arabic word make the process of
character isolation a very difficult one. According to the morphological
features, the Arabic characters are connected each another within one word by
junction lines. The researchers realized this fact and started publishing
methods to solve the problems of the segmentation. These methods are classified
in many ways. This paper categorizes the segmentation methods into two
approaches: Junction-Seeking Approach (JSA) and Recognize-Segment Approach (RSA)
and provides a comprehensive review for segmentation methods in the last 20
years. The contribution also involves analyzing of the preprocessing stage and
the techniques that are commonly used in the Arabic character recognition
system.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Character Segmentation, Morphological Features, Junction-Seeking,
Recognize-Segment, Arabic character recognition.
A Survey of Some Fair
Exchange Protocols
by D. Konar, C. Mazumdar
Abstract
- We define the properties of fair exchange protocols and present a survey of
six published fair exchange protocols from different areas of applicability. The
survey is in particular rabout some properties of these protocols, viz.,
fairness, correctness of product, customer’s anonymity, TTP’s involvement,
timeliness and also about channel requirement. We also present a comparative
analysis of these protocols and conclude by indicating some open problems.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Correctness of product, Customer’s anonymity, Fair exchange protocol, Optimistic
Protocol.
Modulator/Demodulator
Approach for a Software Radio
by H. Ben Hnia, A. Kachouri, L. Kamoun
Abstract
- Software radio basically refers to an ensemble of techniques that permit the
reconfiguration of a communication system without the need to change any
hardware system element. That goal is to produce communication devices capable
of supporting several different services, applications, and standards. In
particular one can imagine a given devices that should support several digital
mobile telephony standards, service and function by just changing its software.
Current devices can provide only one type of standards due to limitations mainly
imposed by their analogue technology parts. The software radio as a promising
solution for the future of 4G wireless communications, because of its ability to
provide flexible architecture, was enabling multi-mode, multi-band,
multi-services, and multi-standards devices. This paper presents a multi-modes
modulator/demodulator conception for a software radio. For it the modulator
design is based to the multi-modes mapper and DDS bloc. The multi-mode mapper
generate symbol mapping using a constellation diagram to implement a variety of
mapping schemes for multi-mode modulator design. This bloc is used by many
modulation schemes. Example includes quadrature amplitude modulation (QAM),
phase shift keying (PSK), and orthogonal frequency division multiplexing (OFDM).
The demodulator is based to algorithm for automatic modulation recognition that
exploits the flexibility of a software radio. Our algorithm is based to
calculate several parameters and used a threshold metric. A purposed approach
can be exploited a flexibility for software radio.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
software radio, modulation, multi-mode, DDS, QAM, PSK, recognition automatic.
Using B Formal Method to Define Software Architecture Behavioral Concepts
by A. Alti, T. Khammaci, A. Smeda
Abstract
- Software architecture is an important key that guarantees services and an
effective analysis tool that ensures efficient verification properties of
software systems. This is confirmed by using architecture description languages
(ADL). The precise semantics of B method and its powerful data abstraction allow
software architects to specify architectural elements behavior explicitly, to
verify their semantics using powerful tools that are designed for the B method.
In this paper, we define the behavioral aspects of software architecture using
the B method. We use this formal method to define the behavioral aspects of COSA,
which is a metamodel for software architecture. We also provide a B formal
specification of the proposed aspects.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Software Architecture, ADLs, Transition, Behavioral Concepts, B method.
Multi Library Wavelet Neural Network for Lossless Image Compression
by W. Bellil, C. Ben Amar, A. M. Alimi
Abstract
- Apart from the existing technology on image compression represented by series
of JPEG, MPEG and H.26x standards, new technology such as Wavelet Neural
Networks (WNN) and genetic algorithms are being developed to explore the future
of image coding. Successful applications of WNN in the case of function
approximation become well established. This paper presents a direct solution
method based on Multi Library WNN for color image compression and coding which
consists to transform an RGB image into Luminance-Chrominance space and then
segment the luminance in a set of m blocks n by n pixels. These blocks should be
transferred row by row (1D input vector) to the input of our wavelet network.
Every input vector will be considered as unknown functional mapping and then it
will be approximated by the network.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Wavelet Neural Network; Image compression and coding, Beta wavelets.
A
Prototype of Account-based Payment M-COM System in M-Commerce
by X. Dai, D. Baran
Abstract
- As the number of wireless communication users is growing, purchasing digital
content and services using mobile phones, PDA and other devices are increasing.
In this paper we describe that Java EE infrastructure for inter-connect M-COM,
broker and bank systems. We demonstrate the feasibility of our approach with an
on-line, pay-as-you-use M-COM example and carry out a usability evaluation
surveyed users of the prototype to assess their impressions of the approach.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
M-Commerce, Account-based payment system and Prototype.
M-Learning: from Learning Anywhere towards Learning from Anything
by M. Muñoz Organero, C. Delgado Kloos
Abstract
- M-learning, as currently implemented, tends to be associated with the use of
mobile devices to have access to contents and services from distance learning
management systems using Internet connections. Although limited in computing
resources, mobile devices are normally personal devices that we use
anytime-anywhere adding new personal-space-time dimensions to the learning
process. Despite these new dimensions, mobile devices are normally restricted to
the implementation of the client part only in the distance learning process and
are not able to offer their own contents and services to other devices. This
paper takes two steps forward in the evolution of m-learning scenarios towards
the learning from anything scenario in which mobile devices can serve contents
and services to other devices. Firstly, it introduces a simplified Servlet API
for mobile devices and its implementation in MIDP2.0. Secondly, it presents an
m-learning asynchronous collaborative tool based on that API.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Distance learning, collaborative learning, mobile computing, pervasive
computing.
High Resolution 3D Acquisition of the Olivier Strebelle's Sculpture “Athletes'
Alley in Beijing 2008”
by O. Debeir, P. Dunham, L. Engels, T. Leloup, X. Baele, N. Warzée
Abstract
- When an artist conceives a masterpiece, by working on a scaled model, their
primary objective is to match the idea of what the art work should be, not to
make a digital version that fulfills the engineering requirements. Olivier
Strebelle's “Athletes' Alley” will be, in its final version, approximately 30 m
tall and more than 100 m long and will be built in Beijing for the next Olympic
games. We describe in this paper how we tackled the digitizing of the scaled
model made by the artist in order to give the most precise digital model
possible compatible with the engineering software. The original artist's model
is made of stainless steel arcs welded together into a complex 3D wired light
weight sculpture. The main challenges of this development were that no existing
3D scanner was adapted for this acquisition and that the time constraint to do
the task was very short. Due to the model's complexity, we opted for a
point-by-point acquisition with a high resolution surgical localizer, combined
with an automatic filtering algorithm based on a priori knowledge of the
sculpture. In summary we manage to perform the 3D geometry acquisition of a very
complex structure by diverting the use of a medical 3D localizer where the
commonly used 3D digitizers could not do the job.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
3D model acquisition, Image rendering, model fitting.
Fail-Silent
Assumptions in Fault-Tolerant Systems
by A. Ademaj
Abstract
- Fail-silent units are implemented by using redundancy of system components.
Errors are detected by comparison of the results produced by these components
and in a case of a result mismatch the result is not delivered. This paper
discusses and analyzes the definition of the fail silence in the context of
safety-critical systems. Furthermore, it describes which items should be
provided within a fault hypothesis for safety-critical systems. Instead of the
definition of fail silence units, we propose the definition of detectable
erroneous units (DEU), and describe a general model of a DEU for distributed
fault-tolerant systems.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Fail silence, fault tolerance, fault hypothesis, dependability evaluation, fault
injection.
A Hybrid Physical Architecture for Wireless Sensor and Actor Networks
by M. Sharifi, A. N. Alamuti
Abstract
- Wireless sensor and actor networks typically consist of a large number of
heterogeneous nodes connected by a wireless medium, wherein sensor nodes collect
data from physical environment and consequently actor nodes perform required
actions. Two types of configuration and architecture for these networks are well
known: automated and semi-automated. In a semi-automated network, sensors only
communicate with sink and actors get orders only from sink. Therefore, sink acts
as the sole central authority and is critical to the network. Although decisions
made by sink centrally leads to reliable actions, it is a single point of
failure of the whole network. In automated networks, sensor nodes directly
communicate with actor nodes and there is no central control over the network.
Although the in-network distributed processing in this type of network leads to
faster responses, the network suffers from lots of overly communicated redundant
messages that may well lead to incorrect actions by actors. This paper presents
a new hybrid architecture that enjoys both the high speed of automated
architectures and the reliability of semi-automated architectures at the same
time. It is shown that the overall performance of the network is by far higher
under this new architecture.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Wireless Sensor and Actor Networks, Automated, Semi-Automated, Architecture,
Performance.
Optimal
FPGA Implementation of Unsigned Bit-Serial Division
by S. Simard, J. G. Mailloux, R. Beguenane
Abstract
- In the present paper, we show that a slight modification to a well-known
unsigned nonrestoring division algorithm leads to an optimal mapping of a
bit-serial divider to FPGA hardware. Advantages of the proposed implementation
are: minimal area occupancy, and no online delay (i.e. the MSB of the quotient
is obtained right with the next clock cycle after input of the first bit of the
operands). Synthesis results are presented for two different Xilinx families of
FPGAs, and different operand widths up to 64 bits. These results show that the
number of 4-input LUTs occupied by one such divider is at most equal to operand
length, and that the maximum clocking frequency largely exceeds 100MHz in every
case tested.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
FPGA, Unsigned division, Nonrestoring, Bit serial.
Impact of Background Scan on Current and Neighbouring Channels in 802.11
Networks
by G. Singh, A. P. Singh Atwal, B. S. Sohi
Abstract
- Background scan process is widely used by IEEE 802.11 mobile nodes for
discovering neighbouring access points and their channels, without breaking
connectivity with the current access point. Background scan generates signaling
traffic on the neighbouring channels in the form of probe request and probe
response frames. Background scan operations also result in temporary disruption
of communication with the current access point while mobile is away for
background scan operation on some other channel. Aim of this paper is to
experimentally investigate the impact of background scanning on the quality of
traffic on current channel and also on neighbouring channels on which background
scan is being performed. Effects of background scan on traffic on current and
neighbouring channels have been measured in terms of important quality of
service parameters like jitter in packet Inter arrival time, packet delay,
packet losses, retransmissions and TCP throughput. Results show that aggressive
background scanning results in degradation in quality of service of traffic on
both the current and the neighbouring channels.
Copyright © 2007 Praise Worthy Prize S.r.l. - All rights reserved
Keywords:
Background scanning, IEEE 802.11, quality of service, Experimental Testbed.
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