BUJICT Volume I, Issue 1, 2008
Abbreviation for Journal: j. inf. commun. technol.
Frontmatter
Pages: I-IV
Title
Binarized Revocable Biometrics in Face Verification
Author(s)
Ying Han Pang and Beng Jin Andrew Teoh
Affiliation
Multimedia University, Malaysia and Electrical and Electronic Engineering Department, Yonsei University
Corresponding Email
Pages
1 - 8
ISSN
1999-4974 (print)
Abstract
A two-factor revocable authentication approach, combining user-specific pseudorandom bit sequence with biometrics is presented. Through the mixing process, a distinct binary code, coined as BioBit, is formed. This provides a protection layer against biometrics fabrication because the system can cancel the compromised and reacquire a new one via bits replacement. BioBit delivers lower error rate as compared to sole biometrics when the genuine token is used by the authorized user. There are two identity theft scenarios may be raised: 1. stolenbiometrics: an imposter possesses intercepted biometrics data to be considered genuine; 2. stolen-token: an imposter has access genuine token and used it to claim himself as the genuine user. BioBit scheme shows the impressive performance (EER=0.001% and EER=0.002% tested on ORL and FERET datasets) in case 1. For the stolen-token case, this approach attains EER=1.28% and EER=1.36% on ORL and FERET datasets.
Keywords
Face recognition, Cancelable biometrics, Two-factor authentication, XOR operation.
Title
On the Performance of Traffic Locality Oriented Route Discovery Algorithm with Chase Packets
Author(s)
Mznah Al-Rodhaan, Lewis Mackenzie and Mohamed Ould-Khaoua
Affiliation
University of Glasgow, UK
Corresponding Email
Pages
9 - 16
ISSN
1999-4974 (print)
Abstract
New traffic locality oriented route discovery algorithm with chase packets, referred to as TLRDA-C, is introduced. It improves route discovery process in on-demand routing protocols for MANETs running applications that exhibit traffic locality. The algorithm defines a neighbourhood region that includes the most likely destinations for each given source node. TLRDA-C broadcasts any route request travelling within their source node’s neighbourhood region according to the routing algorithm used. However, propagation of the route request is deliberately delayed within the beyond-neighbourhood region to provide the associated chase packet with an opportunity to stop the fulfilled route request and minimise network congestion. The algorithm is adaptive and continuously updates the boundary of each source node’s neighbourhood to improve performance. We provide detailed performance evaluation using simulation modelling and compare our algorithm with AODV, Limited Broadcasting, and Blocking-ERS. Our result shows that TLRDA-C improves the performance by minimizing the average end-to-end delay as well as the network overhead and congestion level.
Keywords
Chase Packets, MANETs, On-demand routing protocols, Route discovery process.
Title
Model Based Face Recognition Across Facial Expressions
Author(s)
Zahid Riaz, Christoph Mayer, Matthias Wimmer and Bernd Radig
Affiliation
Technical University of Munich
Corresponding Email
Pages
17 - 24
ISSN
1999-4974 (print)
Abstract
This paper describes a novel idea of face recognition across facial expression variations using model based approach. The approach follows in 1) modeling an active appearance model (AAM) for the face image, 2) using optical flow based temporal features for facial expression variations estimation, 3) and finally applying binary decision trees as a classifier for facial identification. The novelty lies not only in generation of appearance models which is obtained by fitting active shape model (ASM) to the face image using objective but also using a feature vector which is the combination of shape, texture and temporal parameters that is robust against facial expression variations. Experiments have been performed on Cohn-Kanade facial expression database using 61 subjects of the database with image sequences consisting of more than 4000 images. This achieved successful recognition rate up to 91.17% using decision tree as classifier in the presence of six different facial expressions.
Keywords
Active Appearance Models, Face Recognition, Image Classification, Decision Trees
Title
Performance Enhancement on Keystroke Dynamics by Using Fusion Rules
Author(s)
Pin Shen Teh, Beng Jin Andrew Teoh, Thian Song Ong and Connie Tee
Affiliation
Faculty of Information Science & Technology, Multimedia University
Corresponding Email
Pages
25 - 32
ISSN
1999-4974 (print)
Abstract
Keystroke dynamics refers to the timing information that expresses precisely when each key was pressed and released as a person types. In this paper, we present a novel keystroke dynamic recognition system by using a novel fusion approach. Firstly, we extract four types of keystroke latency as the feature data from our dataset. We then calculate their mean and standard deviation to be stored as template. The test feature data will be transformed into similarity scores via Gaussian Probability Density Function (GPD). We also propose a new technique, known as Direction Similarity Measure (DSM), to measure the trend differential among each digraph in a phrase. Lastly, various fusion rules are applied to improve the final result by fusing the scores produced by GPD and DSM. Best result with equal error rate of 2.791% is obtained when the AND voting rule is used.
Keywords
Dwell time, flight time, keystroke dynamics, keystroke latency
Title
Advanced Collage Steganography
Author(s)
Sajad Shirali-Shahreza and Mohammad Shirali-Shahreza
Affiliation
Sharif University of Technology, Iran
Corresponding Email
Pages
33 - 38
ISSN
1999-4974 (print)
Abstract
Establishing hidden communication is an important subject that nowadays has gained increasing importance. Embedding a secret message into a cover media without attracting any attention, known as steganography, is of one the methods used for hidden communication purposes. In this paper, we present an advanced version of “Collage Steganography” method which is robust against various attacks. In this method, an image (for example a view of a room) is created which contains some coded information. This method is robust against attacks such as adding noise, blurring, JPEG compression, and print-scan attacks.
Keywords
Image Steganography, Information Hiding, Print-Scan Attack, Collage, Multi-Resolution Processing
Title
New Techniques to Suppress the Sidelobes in OFDM System to Design a Successful Overlay System
Author(s)
Saleem Ahmed, Razi Ur Rehman and Humor Hwang
Affiliation
Myongji University
Corresponding Email
Pages
39 - 44
ISSN
1999-4974 (print)
Abstract
In orthogonal frequency division multiplexing (OFDM) systems the reduction of outof-band radiations is an essential topic. To design a successful OFDM based overlay systems, it is important to reduce the sidelobes in OFDM systems. In this paper we consider three approaches: Subcarrier weighting (SW) which is based on the multiplication of the used subcarriers with real-valued weighting factors, second approach we consider is multiple choice sequence (MCS) which is based on producing set of sequences and selecting the one sequence which has lowest power in sidelobes and third approach we consider is the conventional windowing of OFDM signal in time domain. We combine MCS with windowing technique and SW with windowing technique. Simulation results show that by combining MCS with windowing technique and SW with windowing technique, the out-of-band radiations in OFDM system can be significantly suppressed.
Keywords
Orthogonal frequency division multiplexing, out-of-band radiations, sidelobe suppression
Title
Distributed Control System for Micro-factory Using Visual Studio.Net
Author(s)
Hla Myo Tun, Zaw Min Naing and Htin Lin
Affiliation
Department of Electronic Engineering, Yangon Technological University
Corresponding Email
Pages
45 - 48
ISSN
1999-4974 (print)
Abstract
Advanced industrial automation system can be monitored and controlled by real time situation is more useful than other formal systems in the sector of industrial life. Distributed Control System (DCS) is more popular than any other control systems in the modern industrial processes. This research leads to “Real Time Graphical User Interface Monitoring System” for Industrial Automation. The current research project is based on the construction of DCS based Micro-factory. The Industrial Local Area Network (LAN) is built between the server for the operator and the clients for the two robots control and only one CNC milling machine. The clientserver model is more suitable for this research. The existing DCS can be divided into two sections: the first one is cheap and inflexible control and the second one is expensive but it is flexible control system. This research leads to cheap and flexible distributed control system. In this research, the simulation of the whole process is described in real-time condition by using Visual Basic.Net programming under Visual Studio 2005 software. The parallel ports of Client computers and the controllers have been communicated with parallel port interface VB.Net program.
Keywords
DCS, Micro-factory, Visual Studio.Net, Control System.
Title
A Robot Joint Model with Minimal Order Feedback Controller and State Observer
Author(s)
Muhammad Usman Keerio, Altaf Hussain Rajpar and AbdulFattah Chandio
Affiliation
Quaid-e-Awam University of Engg., Sc. and Tech,. Nawabshah
Corresponding Email
Pages
49 - 54
ISSN
1999-4974 (print)
Abstract
In this paper, a novel control method and state observer is used for an autonomous humanoid robot joint model. Motors controlling the various movements of the robot will track prespecified joint trajectories by using new controller, to achieve accurate trajectory tracking. The controller is minimal order and is able to produce desirable results. The linearized system correspond to a certain class of linear systems, which makes it attractive for the application of a simpler order feedback control designed on the basis of quasi-linear feedback theory. Under this design, the pole of the lead-lag compensator depends on the gain of open loop system. A simulink model is developed to model single joint in the body. The designed controller guarantees fast tracking of the desired trajectories, as well ensures the safety. Since the plant model involves differentiation of a state variable to generate another, resulting in a reduction of signal to noise ratio, a state observer is designed for the feedback system to ensure maximum safety and improved performance. The simulations are done showing the validity of the scheme. Pole placement method is used to design the observer parameters. The application of proposed controller and state observer is illustrated by linear model.
Keywords
Humanoid, robot joint system, state observer.
Title
Module Extraction in Ontologies: The Case of a Single Concept Name
Author(s)
Anees Ul Mehdi
Affiliation
University of Iran
Corresponding Email
Pages
55 - 59
ISSN
1999-4974 (print)
Abstract
Modularity is important in the collaborative development of large scale ontologies. The subject has already been studied deeply and different notions of modularity have been developed. Further different algorithms for extracting module are developed. Such an extraction requires an input ontology and a signature. The extracted module is a subset of the original ontology containing no concept name and role names other than those occurring in the input signature. In this paper we focus on a very special case of importing a single concept i.e., our input signature contains only a single concept name. We will see that we always end up with the same set of modules (modulo the concept name being imported), and such an import, for the purpose of reasoning, is not of much practical interest.
Keywords
Module Extraction, Ontologies, Description Logics.