International Journal of New Computer Architectures and their Applications

15-24

Authors: Bachir Chihani, Emmanuel Bertin, Fabrice Jeanne, Noel Crespi

Users may sometimes be overloaded with work so that they become temporally unable to handle incoming communications. Context aware systems are a promising approach to facilitate daily-life activities, especially providing assistance for communication management. After having surveyed the different challenges to build context-aware systems (e.g. modeling, reasoning about context), we introduce here HEP, a system that recommends communication services to the caller based on the callee’s context. The recommendation is in form of advertising the workload of callee. HEP’s main context source is the usage history of the different communication services as well as the users’ calendars. It has been prototyped and tested at Orange Labs.

34-51

Authors: Radu Terec, Mircea-Florin Vaida, Lenuta Alboaie, Ligia Chiorean

This paper presents alternative security methods based on DNA. From the available alternative security methods, symmetric DNA algorithms were developed and implemented. The first symmetric DNA algorithm was implemented in the Java language, while the second DNA algorithm was implemented in BioJava and MatLab. Comparisons have been made between the performances of different standard symmetrical algorithms and the DNA proposed algorithms. As a new step to enhance the security, an asymmetric key generation inside a DNA security algorithm is presented. The asymmetric key generation algorithm starts from a password phrase. The asymmetric DNA algorithm proposes a mechanism which makes use of more encryption technologies. Therefore, it is more reliable and more powerful than the OTP DNA symmetric algorithms.

61-73

Authors: Yas A. Alsultanny

Database preprocessing is very important to utilize memory usage, compression is one of the preprocessing needed to reduce the memory required to store and load data for processing, the method of compression introduced in this paper was tested, by using proposed examples to show the effect of repetition in database, as well as the size of database, the results showed that as the repetition increased the compression ratio will be increased. The compression is one of the important activities for data preprocessing before implementing data mining. Data mining methods such as Na¨ıve Bayes, Nearest Neighbor and Decision Tree are tested. The implementation of the three methods showed that Na¨ıve Bayes method is effectively used when the data attributes are categorized, and it can be used successfully in machine learning. The Nearest Neighbor is most suitable when the data attributes are continuous or categorized. The third method tested is the Decision Tree, it is a simple predictive method implemented by using simple rule methods in data classification. The success of data mining implementation depends on the completeness of database, that represented by data warehouse, that must be organized by using the important characteristics of data warehouse.

84-96

Authors: Guangri Jin, Li Gong, Hiroshi Furukawa

We have proposed Intermittent Periodic Tra nsmission (IPT forwarding) as packet relay method for wireless backhaul. In IPT forwarding, a source node sends packets to a destination node with a certain time interval (IPT duration) so that signal interference between relay nodes that send packets simultaneously are reduced and frequency reuse is realized, which brings about an improvement of system through put. However, the optimum IPT duration setting for each node is a difficult problem which was not solved adequately paper, we propose a new training based duration setting protocol which employs some training packets to search optimum IPT durations for each node. also extend the proposed protocol for wireless backhauls applying antennas. The proposed protocol ated both with computer simulation experiments. Evaluation results show that the proposed protocol is not only very effective but also practical.

112-122

Authors: Ramzi. Ayadi, Bouaoui. Ouni, Abdellatif. Mtibaa

In reconfigurable computing systems, full reconfigurable FPGA are evolving rapidly, due to their flexibility and high performance. In this paper, we focus on communication cost between partitions in order to develop an algorithm to solve temporal partitioning problems for full reconfigurable architecture. In fact, this algorithm optimizes the transfer of data required between design partitions. The proposed algorithm was tested on several examples on the Xilinx Virtex-II pro. The results show significant reduction in the communication cost compared with others famous approaches used in this field

133-148

Authors: Natrah Abdullah, Wan Adilah Wan Adnan, Nor Laila Md Noor

In line to the introduction of the online museum, a user interface is a new medium to allow museum collections to be exhibited and promoted more effectively. For promoting purposes, this paper stresses on usability of the interface design. It is critical to pay attention to the cognitive design and ensure that the interface is usable in order to help users understand the displayed information. The user interface design for online museum has commanded significant attention from designers and researchers but lacks in the cognitive design perspective. In the effort to formalize the design, this paper is the extension of the initial work on a user interface design dimensions. The individual differences approach is adopted to explore possible user interface design elements. This study also validates the dimensions by conducting empirical investigation. The investigation is to test the hypotheses linkage between cognitive styles and user interface dimensions. The research method involves using Field Dependent and Field Independent as the case study and webbased survey on online museum visitors. The result of the analysis suggests cognitive styles do influence user interface dimensions. These design dimensions contain the implications for cognitive design of user interface development, and the identification of cognitive design of user interface for cultural website. The effort may contribute towards increasing the usability level of the website.

162-175

Authors: Chadi Abou-Rjeily

In this paper, we study the communications over the free-space optical (FSO) links in the presence of atmospheric turbulence that induces strong fading on the FSO channel. We consider the three-way systems where a wireless transceiver (or relay) that is present in the neighborhood of the source and destination shares its resources for assisting the source in delivering its message to the destination. In particular, we derive the error performance of the three-way FSO systems that are implemented with a convenient combination of channel and diversity coding. This joint channel-diversity coding that is associated with adapted decoding at the relay and the destination results in a better immunity against noise and fading and results in high performance levels over a very wide range of the signal-to-noise ratio. Another appealing feature of the considered system resides in the fact that the error protection is not associated with any reduction in the data rate.

185-198

Authors: Martin Cápay, Zoltán Balogh, Michal Munk, Miroslava Mesárošová

In the paper we describe the applicability of different types of resources and activity modules in the e-learning courses and the worthiness of their usage. The presented ideas are supported by the outcomes of the questionnaire research realized within the e-learning study as well as the usage analysis of particular e-course ―Role of a nurse in community care‖ which was one of the outcomes of the international project E-learning in Community Care supported by Leonardo da Vinci. We will also compare the outcomes of data analyses mentioned before and try to find the reasons of these differences. All presented information was implemented and verified in the combined forms of education. The authors present a detailed analysis of the user log-on data, on which we can better understand the behavior of the student in an electronic learning environment. Comparing the answers and outcomes of usage analysis we are able to find out the real process of the participants’ study and eventually interpret the differences.

209-222

Authors: Aicha Baya Goumeidane, Mohammed Khamadja, Nafaa Nacereddine

This paper presents an adaptive probabilistic region-based deformable model using an explicit representation that aims to extract automatically defects from a radiographic film. To deal with the height computation cost of such model, an adaptive polygonal representation is used and the search space for the greedy-based model evolution is reduced. Furthermore, we adapt this explicit model to handle topological changes in presence of multiple defects.

236-244

Authors: Yamina Boutiche

In this paper, we propose a model for active contours to detect boundaries’ objects in given image. The curve evolution is based on Chan-Vese model implemented via binary variational level set formulation. The particularity of this model is the capacity to detect boundaries’ objects without need to use gradient of the image, this property gives its several advantages: it allows to detect both contours with or without gradient, it has ability to detect automatically interior contours, and it is robust in the presence of noise. For increasing the performance of model, we introduce the level sets function to describe the active contour, the more important advantage to use level set is the ability to change topology. Experiments on synthetic and real (weld radiographic) images show both efficiency and accuracy of implemented model.