Volume 3, Issue 7 (2007) | Journal of Computer Science

SSM: Slot Scheduling Mechanisms in a Multihop Wireless Hotspot Network

Maan Younis Abdullah — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.461.464

Our focus was to determine a "slot" time for message forwarding. To this end, we model the system as a "Queue" where the time for packet forwarding is determined by slot, at different slot range for e...

Artificial Intelligence Based Three-Phase Unified Power Quality Conditioner

Moleykutty George — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.465.477

Power quality is an important measure of the performance of an electrical power system. This paper discusses the topology, control strategies using artificial intelligent based controllers and the per...

Computer Security: a Survey of Methods and Systems

Roman V. Yampolskiy — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.478.486

In this work we have reviewed studies which survey all aspects of computer security including attackers and attacks, software bugs and viruses as well as different intrusion detection systems and ways...

An Efficient Algorithm for Tree Mapping in XML Databases

Yangjun Chen — 2007-07-21

Journal of Computer Science, Published online: 21 July 2007; doi:10.3844/jcssp.2007.487.493

In this article, we discuss an efficient algorithm for tree mapping problem in XML databases. Given a target tree T and a pattern tree Q, the algorithm can find all the embeddings of Q in T in O(|T||Q...

Removing Useless Productions of a Context Free Grammar through Petri Net

Mansoor Al-A'ali — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.494.498

Following the proposal for a Petri Net (PN) representation of the Context Free Grammar (CFG)[1], we propose in this paper, an algorithm to eliminate the useless productions of CFG. First the CFG is re...

Dependencies Management in Dynamically Updateable Component-Based Systems

Saleh Alhazbi — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.499.505

This paper discusses dependencies analysis significance when updating component-based system dynamically. It presents a service-based matrix model and nested graph as approaches to capture components'...

Efficient Physical Organization of R-Trees Using Node Clustering

F. Sagayaraj Francis — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.506.514

R-Tree is a multidimensional indexing structure that forms basis for all the multidimensional indexing structures based on data partitioning. A number of attempts have been made in the past to improve...

System Interoperability Study for Healthcare Information System with Web Services

J. K. Zhang — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.515.522

This paper describes the use of a new distributed middleware technology ‘Web Services’ in the proposed Healthcare Information System (HIS) to address the issue of system interoperability raised fr...

Numerical Solutions of the Multispecies Predator-Prey Model by Variational Iteration Method

Khaled Batiha — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.523.527

The main objective of the current work was to solve the multispecies predator-prey model. The techniques used here were called the variational iteration method (VIM) and the Adomian decomposition meth...

High-precision Detection of Facial Landmarks to Estimate Head Motions Based on Vision Models

Xiaohong W. Gao — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.528.532

A new approach of determination of head movement is presented from the pictures recorded via digital cameras monitoring the scanning processing of PET. Two human vision models of CIECAMs and BMV are a...

Proximity Aware Routing in Ad Hoc Networks

Valerie Alandzi — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.533.539

Most of the existing routing protocols for ad hoc networks are designed to scale in networks of a few hundred nodes. They rely on state concerning all links of the network or links on the route betwee...

A Web-based Interactive Real Laboratory for Process Engineering Education

Maher Chaabene — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.540.545

An online supervision and control of a laboratory designed for process engineering education was conceived. The principal aim was to minimise the time access of an operator when manipulating laborator...

Security Manager - Key to Restrict the Attacks in Bluetooth

Pushpa Suri — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.546.548

Bluetooth is the technology that utilizes radio frequency waves as a way to communicate wirelessly between digital devices. The Bluetooth user has the choice of point-to-point or point-to-multipoint l...

Optical Character Recognition System for Arabic Text Using Cursive Multi-Directional Approach

Mansoor Al-A'ali — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.549.555

This paper presents a novel new technique based on feature extraction and on dynamic cursor sizing for the recognition of Arabic Text. The most challenging area in Arabic OCR (AOCR) research is the se...

A Block Cipher Using Linear Congruences

V. U.K. Sastry — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.556.560

We have developed a block cipher by using modular arithmetic inverse and linear congruences. The cipher contains a key matrix called the outer key. It also includes another key, which contains a set o...

A Secure Time-Stamp Based Concurrency Control Protocol For Distributed Databases

Shashi Bhushan — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.561.565

In distributed database systems the global database is partitioned into a collection of local databases stored at different sites. In this era of growing technology and fast communication media, secur...

Classification of Squamous Cell Carcinoma Based On Color and Textural Features in Microscopic Images of Esophagus Tissues

P. S. Hiremath — 2007-07-31

Journal of Computer Science, Published online: 31 July 2007; doi:10.3844/jcssp.2007.566.573

This paper presents a method for feature extraction using color and texture from microscopic images of esophagus tissues obtained from the abnormal regions of human esophagus detected through endoscop...