International Journal of Advanced Science and Technology

6

Authors: Cong Jin, Qing-Hua Deng and Jun Liu

In this paper, two different propagation models based on different topologies of email network are proposed. By analyzing the means and the characters of email virus spreading, the function of email virus propagation is given, and the maximum time of email virus propagation before the anti-virus software is calculated. The condition in which email virus propagation stops is also proved. The relation between average node degree and power law exponent is discussed later. The models have been testified its rationality through simulation experiments.

8

Authors: Golriz Khazan and Mohammad Abdollahi Azgomi

Security of computer systems and networks has become very significant nowadays. Introducing and using a unified framework for modeling and quantitative security evaluation (QSE) is an open problem. Th results of our study on drawbacks of the existing security assessment methodologies motivated us to use a simulation framework for model-based security evaluation. We have used discrete-event simulation (DES) and the SimEvents tool for QSE of a domain name system (DNS). First, the normal operation of the DNS is simulated. Then, an attacker is added to the model. The aim is to evaluate the instantaneous availability of DNS as an important measure of security. Finally, as a case study, DNS spoofing attack model is constructed and the availability of the attacked system is evaluated. The proposed approach can be used for other kinds of attacks and other types of systems, networks and applications. In this paper the simulation models and their results are presented.

8

Authors: Yuyang Liu, Wooi Ping Cheah, Byung-Ki Kim and Hyukro Park

We explore the software metrics and build a Bayesian Network Model for defect prediction. Much previous work has concentrated on how to select the software metrics that are most likely to indicate fault-proneness, based on the hypnosis that these metrics are independent. But in reality, software metric values are predicted not only correlated with fault-proneness, but also observed internal complex relationship with each other. In this paper,we build a Bayesian network model to represent the probability distribution of each factor and how they affect defects, considering strong or weak correlations are existed between individual metric attributes. We perform a comparative experimental study of effectiveness of Bayesian Network, logistic regression and Naive Bayes on a public data set from an open source software system. The result shows that our approach produces statistically significant estimations.

10

Authors: Myung-Hee Lee, Cheol-Jung Yoo and Ok-Bae Jang

Recently, the need for accessing information from anywhere at any time has been a driving force for a variety of mobile applications. As the number of embedded systems increases rapidly, there has been a growing demand for the use of Service Oriented Architecture (SOA) for various applications. Embedded system service offers a systematic way to classify and assess technical realizations of business processes. But embedded system has restricted range of utilizing services in computing environment and more, a mobile computer is envisioned to be equipped with more powerful capabilities, including the storage of a small database, the capacity of data processing, a narrow user input and small size of display. This paper present embedded system software testing based on SOA to overcome mobile restriction. To improve embedded system efficient we analyzing mobile application requirement, writing service specification, optimizing design, providing extended use case specification which test use case testing and testing service test case which derived from service specification.

10

Authors: Stan Kurkovsky

As a practice-oriented discipline, Software Engineering is most effectively taught by using a variety of hands-on experiences. Team-based projects where students can practice their technical and soft skills are a key feature of many software engineering courses aimed to prepare students for the realities of industrial software development. This paper surveys the objectives of software development projects in undergraduate courses and summarizes four roles in which the instructor can participate in student projects: a customer, an architect, a team manager, and a mentor. The paper is concluded with case studies illustrating the nature of these roles.

12

Authors: Ching-Tang Hsieh, Yeh-Kuang Wu, and Kuo-Ming Hung

As digital halftone images are widely used in the printing of books, magazines, newspapers and computer printers, the ease with which perfect copies can be made, may lead to large-scale unauthorized copying. Watermarking has been considered for many copy prevention and copyright protection applications. The hybrid watermarking system is proposed for halftone images that the watermarks embedded based on the spatial domain and frequency domain separately to enhance the robustness. For the purpose of copyright protection, the watermarks are embedded into the halftone image with visual transparency and robustness by the variety of dispersed dot order dither arrays generated by the particle swarm optimization (PSO) method achieving good robustness and image quality produce patterns for the spatial watermarks embedding system. After the binary pseudo-wavelet transform (BPWT), the second watermarks are embedded into the high-frequency components of the BPWT coefficients of the spatial domain based watermarked image that the frequency domain based watermarking is independent to the spatial domain based one. And the modified quality criterion system for halftone images is proposed by using the PSO based visual filter. The experimental results show that the hybrid watermarking algorithm is more robust for halftone images and the watermarked halftone image possesses high image quality by the PSO algorithm.