Paper Title, Authors, Abstract (Issue 1, Volume 3, 2009)

Pages

Novel Approach for Optimization of Cell Planning and Capacity
Ali Hakan Isik, Inan Guler

Abstract: Configuration, Cost, base station output power are important resources in cellular mobile radio systems. The main idea of cell planning is the maximize capacity in another words number of subscribers and minimize cost at the same time. In a GSM system, where coverage areas are divided into cells in planning phase, the division method and its parameters have a great importance. This study explains GSM system and cell planning process, and gives information about the features of fuzzy logic algorithm. Fuzzy logic solves problems better than other control algorithms in which initial parameters are needed to be assigned by the designer, which have variables that aren’t defined well and change with time and where system expert’s knowledge and experience have great importance in design process. Cell planning has same important problems that it’s variables aren’t defined well, change with time. These important problems of cell planning are the cell radius, base station number and power, TRU (transceiver unit) number, N (number of cells per cluster), cost, CIR (channel interference ratio), D (distance between two cells which use same frequency at the same time) are found for urban, suburban and rural areas by using omni or three sector antennas. GSM cell planning is simulated by using fuzzy logic algorithm, a computer program is written to determine what kind of configuration changes have to be made so as to minimize the number of base station, and hence the total system cost, and also to maintain the requirements of the maximum traffic demand. In addition, input and output data can be defined through the interface which is created in C++ Builder programming language.
 

Numerical Analysis of Raised-Cosine Sampled Chirped Bragg Grating for Dispersion Compensation in Dense Wavelength Division Multiplexing Systems
Fethallah Karim, Omar Seddiki

Abstract: In this paper, a numerical investigation of raised-cosine sampled chirped fiber Bragg grating (SCFG) has been presented. This multi channel filter is modeled by coupled mode theory and simulated by transfer matrix method. The optical period changes linearly at each section of the grating according to a negative period variation. To reduce ripples and side lobes, a raised-cosine apodization is applied. SCFG is proposed for the purpose of dispersion management in dense wavelength division multiplexing systems. Numerical results show that SCFG presents five channels in a bandwidth of 0.6 nm and with a dispersion of -1400 ps/nm. The wavelength spacing between two neighboring channels is 0.8 nm.
 

Fingerprint Watermark Embedding by Discrete Cosine Transform for Copyright Ownership Authentication
Chi-Man Pun, Ioi-Tun Lam

Abstract: In respect to the issues on protecting intellectual property, particular for artistic works in electronic form, some sorts of techniques could be put on a copyright material image to ensure its ownership authentication. In this paper, signatories’ biometric fingerprint watermark message in digital format will be embedded into a copyright material image by Discrete Cosine Transform (DCT) for copyright ownership authentication. During the embedding process, copyright material image and the fingerprint watermark message will be adaptively partitioned and then DCT method will be applied to each partition for embedding and extracting the watermark message. Experimental results from our prototype system show that the proposed method is successfully tested for message embedding and extraction. In case that the watermarked image has been attacked, the embedded digital fingerprint watermark message can still be extracted with a certain degree of tolerance.
 

    Paper Title, Authors, Abstract (Issue 2, Volume 3, 2009)

Pages

Performance Evaluation of XML Web Services for Real-Time Applications
Hazem M. El-Bakry, Nikos Mastorakis

Abstract: Service-Oriented Architecture (SOA) has been becoming one of the most widely used methodologies for building and integrating different types of software applications. This because the extreme benefits that it offers to their adopters including agility, dynamicity, and loose-coupling. These benefits are usually missed in traditional software terminologies and practices. XML Web Services is the most used technology for realizing SOA because it is easy to use. Furthermore, it allows high interoperability between different systems due to its dependency on standards that are widely accepted and supported by almost all large software vendors. However, XML Web Services suffers from a number of drawbacks such as low performance, bad utilization of hardware resources, and high network latency. These pitfalls may prevent some adopters from utilizing SOA in large and complex systems. Therefore, these issues should be first addressed and resolved before leveraging it into real-time systems. Here, an experimental evaluation for the performance of XML Web Services in real-time business systems is presented. Moreover, this study offers some tactics and strategies that might be used to enhance the overall performance of XML Web Services.
 

New Aspect on Wireless Communication Networks
Marius-Constantin Popescu, Nikos E. Mastorakis

Abstract: This paper provides a detailed picture on computer networks and especially on wireless networks, focusing on specific characteristics of wireless systems. By using MIMO technology (Multiple Input Multiple Output), network logon ca be realized at distances much greater. The use of antennas allows reception and transmission of multiple data streams simultaneously, and the router gives a much better quality of data transmission and added safety. For network security is available WEP encryption on 64 or 128 bits. Technology and wireless services now offered by manufacturers and retailers are moving quickly to satisfy all communication needs. Requests for services and improved functionality, both in public domain and in the business domain, led to the development of wireless technology to offer type services of "anywhere / anytime" for transparent interconnection of voice / data / video with existing network and Internet access through service providers.
 

Creating a Service Oriented Architectural Model for Emergency Vehicles
Jyri Rajamaki, Timo Villemson

Abstract: E.g. Finnish police cars have about 40 different user interfaces (radio, navigation, command and control systems, radar, alarm lights, etc.) on the deck beyond the cars’ standard user interfaces. In cold weather conditions, not all police vehicles are creating enough electricity for intensive operations. Also, wiring and ergonomics are problematic. The annual delivery amount of emergency vehicles is, however, so low that traditional business models, where devices and systems are sold to the end-user, do not motivate suppliers to do invest significantly in system development. Therefore, other business models, such as digital service concepts, are needed for security services. In this paper, the concept vehicle is a Volkswagen transporter used by the Finnish police, but the possibility of extending this concept to other emergency vehicles is also discussed. A new mobile platform for police cars is proposed, and the digital service design parameters of the ICT integration solution are defined. Further research subjects are also presented.
 

A Printed Monopole Antenna for Cellular Handsets
M. Bank, M. Haridim

Abstract: In this paper we propose a modified monopole antenna for use as internal antenna in mobile handsets. In this antenna, called the MB antenna, the radiating element (monopole) is implemented in parallel to a ground plane, without degradation of its radiation characteristics. Simulations show that the MB antenna performs similar to the conventional monopole antenna and has superior performance over PIFA. The proposed antenna can be used as an embedded antenna in compact cellular handsets, and seem promising for application to MIMO antenna systems subject to space limitation.
 

    Paper Title, Authors, Abstract (Issue 3, Volume 3, 2009)

Pages

An Intelligent Distributed Algorithm for Efficient Web Image Retrieval
Alaa M. Riad, Ahmed Atwan, Hazem M. El-Bakry, Sameh Abd EL-Ghany, Nikos Mastorakis

Abstract: Web image retrieval is a challenging task that requires efforts from image processing, web text retrieval, and link structure analysis. General web image retrieval engines such as Google and Yahoo retrieve images according to the meta-data or the context in which the images are found. Hence, the results search engines are far from expected regarding the semantics of the images and the user can be overwhelmed by thousands of results, of which few are valuable. In order to become an effective complement to traditional Web-scale text-based image retrieval, content-based image retrieval must address scalability and efficiency issues. This paper presents a framework for distributed content based web image retrieval. The proposed framework is based on multi-agent system where agent autonomously searches for images over the internet to find images matching a given example. During image retrieval, the system can decide an optimized retrieval strategy by automatically analyzing the query input, thus a search agent is routed only to the image sources that maintaining categories of images similar to the query in content (color and shape). The mobility enables the search agent to perform local image match at image sources, which is expected to improve retrieval speed and reliability by minimizing network traffic and dependence on network status.
 

A Mobile Disaster Management System Using the Android Technology
Jovilyn Therese B. Fajardo, Carlos M. Oppus

Abstract: The Philippines is one of the countries in the world vulnerable to natural hazards because of its geographic location. It also lacks an efficient disaster management system that will help in times of need. One common scenario during disasters is that the activity of rescue and relief is not well-coordinated. For this reason, there is a need for a system that will help in the efficient provision of rescue and relief to disaster-affected areas. Since the use of smart phones is gaining interest in people, the disaster management system was implemented as a smart phone application using Google’s Android operating system. The disaster management system Android application known as MyDisasterDroid determines the optimum route along different geographical locations that the volunteers and rescuers need to take in order to serve the most number of people and provide maximum coverage of the area in the shortest possible time. Genetic algorithm was applied for optimization and different parameters were varied to determine the most optimum route.
 

    Paper Title, Authors, Abstract (Issue 4, Volume 3, 2009)

Pages

Analysis of SAR Reduction of Mobile Phones in Heterogeneous Media
M. Haridim, B.Levin, Z. Ibragimov, M. Bank

Abstract: The mutual effect of symmetrical electric dipoles located in the near region of each other is considered. The problem is solved with due account of the space heterogeneity. The results are applied to the compensation method for losses reduction in head of phone user. The cellular phone antennas PIFA and MB are compared with each other. The SAR reduction ability combined with the compact size and high gain characteristics of the MB antenna make it a promising candidate for compact and safe cellular handset applications. It is shown that the use of linear array of additional radiators, instead of a single auxiliary radiator is an effective method for increasing the dark spot dimensions.
 

Throughput and Power Consumption Comparisons of Zigbee-based and ISM-based Implementations of WSAN
Rosula S. J. Reyes, Jose Claro Monje, Marc Ericson C. Santos, Lorlynn A. Mateo, Roma Lynne G. Espiritu, John Vianney Isiderio, Carlos Miguel M. Lacson, Ray Edwin T. Ocfemia

Abstract: Wireless sensor and actuator networks have expanding applications which requires better throughput, power efficiency and cost effectiveness. This study intends to contribute to the growing pool of knowledge on WSAN especially in the design for novel applications such as image or video over WSANs, and solar energy and RF energy harvesting for the WSAN nodes. Two basic scalable wireless sensor and actuator networks were implemented and characterized in terms of throughput and power consumption. The two WSANs are the Zigbee-based WSAN which is based on the IEEE 802.15.4 protocol, and the ISM-based Zigbee which makes use of the industrial, scientific and medical (ISM) radio bands. The star topology was used for both WSAN implementations. The throughput is quantified with varied factors including distance from node to node, obstructions in between nodes and co-channel interference. As distance and obstructions between nodes are increased, the throughput for both networks decreases with varying degrees. Co-channel interference is also considered. The ISM-based WSAN network is weak in dealing with co-channel interference and error rate as compared to the Zigbee-based WSAN, thus requiring it to have a better data encryption. Power consumption is generally larger for the ISM-based WSAN as compared to its Zigbee-based counterpart. However, the ISM-based nodes consume the same power even up to a few hundreds of meters distance and are thus practical for covering large distances. Therefore, the Zigbee-based WSAN system is more appropriate for closed environment, such as in room automation and home automation applications where distance from node to node is relatively shorter. The ISM-based WSAN prototype, on the other hand, can be developed further for applications in larger areas such as deployment in fields and cities, since transmission is not generally limited by distance and obstructions.