Journal of Computer Science articles from July 2007

Journal of Computer Science archives from July 2007

SSM: slot scheduling mechanisms in a multihop wireless hotspot network.(Technical report)
July 1, 2007... INTRODUCTION In the Ad Hoc network, mobile nodes move constantly so that the topology of the network is dynamic, the links between nodes are unreliable, even broken, etc,. These uncertainties are related to the geographical locations....

Artificial intelligence based three-phase unified power quality conditioner.(Technical report)
July 1, 2007... INTRODUCTION The better controllability, higher efficiency, higher current carrying capability, and fast switching characteristics of static power converters are promoting major changes in controlling the power flow of transmission and...

Intrusion Detection (ID) is defined as detection of break-ins and break-in attempts via automated software system.(Technical report)
July 1, 2007... INTRODUCTION As computer systems become more and more important to our every day lives it is necessary to protect them from actions that attempt to compromise the reliability, confidentiality or availability of such systems (1),(2). In...

An efficient algorithm for tree mapping in XML databases.(Technical report)
July 1, 2007... INTRODUCTION XML uses a tree-structured model for representing data. Queries in XML languages (such as Xpath (1), Xquery (2),(3), XML-QL (4) and Quilt (5),(6)) also typically specify selection patterns as a kind of tree-structured...

Removing useless productions of a context free grammar through Petri Net.(Technical report)
July 1, 2007... INTRODUCTION Considerable interest has been shown in Petri Nets (PNs) as suitable models for representing and studying concurrent systems because of its potential advantages.The major use of Petri Net has been the modeling of systems in...

Efficient physical organization of R-Trees using node clustering.(Technical report)
July 1, 2007... INTRODUCTION Any computer based solution has broadly two sides to itself--the software side and the hardware side. Even if the solution on one side is good, if the solution on the other side is not equally good, the entire purpose of the...

System interoperability study for Healthcare Information System with Web Services.(Technical report)
July 1, 2007... INTRODUCTION With the evolution of IT technologies and increasing demands from people for computerising medical-related information, healthcare institutions have developed systems to manage and process the large amount of medical...

Numerical solutions of the multispecies predator-prey model by variational iteration method.(Technical report)
July 1, 2007... INTRODUCTION The variational iteration method (VIM) wasproposed by He (1) initially with the aims to solvefrontier physical problem. It has been applied to a wide class of deterministic and stochastic problems, linearand nonlinear, in...

High-precision detection of facial landmarks to estimate head motions based on vision models.(Technical report)
July 1, 2007... INTRODUCTION Positron emission tomography (PET) is a relatively lengthy procedure with a typical scanning time up to one hour. It is therefore difficult for a subject to stay still during the data acquisition period. However even...

Proximity Aware Routing in Ad hoc networks.(Technical report)
July 1, 2007... INTRODUCTION Ad hoc networks consist of autonomous nodes that collaborate in order to forward packets. There is no stationary infrastructure. Thus, each node acts as an end system and a router at the same time. In mobile ad hoc networks,...

A Web-based interactive real laboratory for process engineering education.(Technical report)
July 1, 2007... INTRODUCTION These last years, impressive advances in Internet have made this network the most successful. Standards, technologies and Web-implementations do not cease improving and diversifying. Nowadays, the use of a Web navigator for...

Security manager -key to restrict the attacks in Bluetooth.(Technical report)
July 1, 2007... INTRODUCTION Bluetooth is an always-on, short-range radio hookup that resides on a microchip. It was initially developed by Swedish mobile phone maker Ericsson in 1994 as a way to let laptop computers make calls over a mobile phone....

Optical character recognition system for Arabic text using cursive multi-directional approach.(Technical report)
July 1, 2007... INTRODUCTION OCR is the process of converting a raster image representation of a document into a format that a computer can process. Thus, it may involve many sub disciplines of computer science including image processing, pattern...

A block cipher using linear congruences.(Technical report)
July 1, 2007... INTRODUCTION In the literature of cryptography Hill cipher (1) has been a prominent block cipher. Considering only 26 alphabetic characters a to z, Hill developed a block cipher whose encryption can be described by the equation C=KP...

A secure time-stamp based concurrency control protocol for distributed databases.(Technical report)
July 1, 2007... INTRODUCTION A distributed database system is described as "one in which multiple database sites are linked by a communications system in such a way that the data at any site is available to users at other sites" (1). This is a system...