Current Issue : April - June Volume : 2011 Issue Number : 2 Articles : 4 Articles
Internetworking over vehicular ad-hoc networks (VANETs) is getting increasing attention from all major car manufacturers. Highways provide an important test case for enhanced Collision Warning System (CWS) based on vehicle to vehicle (v2v) communications. Owing to the limited number of test beds and their high cost, we focus on the evaluation studies being performed via simulation. As the mobility of vehicles and driver behavior can be affected by network messages, these tools must include a vehicle mobility model integrated with a quality network simulator. DSRC-based wireless communication protocols can be leveraged for the development of a collision warning system application for enhancing highway traffic safety. The key parameter that needs to be fed into these protocols is a realistic mobility model which contains criterion linked to speed, road intersections, traffic light effect etc. Several mobility models are developed in this regard. Various simulations with different parameters and network model are therefore the first step to study the performance of communication network in VANET so as to develop an effective VANET system over a region or area. This article presents a review of the Collision Warning System using the traffic simulator VanetMobisim and the popular networking simulator NS-2....
Recently, an enhanced spatiotemporal chaotic image/video cryptosystem was proposed by Rhouma and Belghith. This paper demonstrates that the enhanced cryptosystem is not secure against the following three different classical types of attacks: chosen plaintext, chosen ciphertext, and known plaintext. In the three attacks, only a pair of (plaintext/ciphertext) was needed to totally break the cryptosystem....
Designing the cylindrical dielectric resonators (CDR) for the radio frequency and microwave communication systems have been presented in this paper. Also some highlights, available from research journals and standard references, on specific issues like effects of shielding, ground plane, dielectric substrate, CDR dimensions and tuning have been widely discussed with logical and mathematical justifications. This compiled review paper will be utilized as a tutorial and reference for the RF group student aspirants and interested technocrats. The technical conceptual theory, principle of working and applications along with demerits has been enlisted with justification. Also future design challenges and other real time aspects are taken care of....
A design review process is where information is exchanged between the designers and design reviewers to resolve any potential design related issues, and to ensure that the interests and goals of the owner are met. The effective execution of design review will minimize potential errors or conflicts, reduce the time for review, shorten the project life-cycle, allow for earlier occupancy, and ultimately translate into significant total project savings to the owner. However, the current methods of design review are still heavily relying on 2D paper-based format, sequential and lack central and integrated information base for efficient exchange and flow of information. There is thus a need for the use of a new medium that allow for 3D visualization of designs, collaboration among designers and design reviewers, and early and easy access to design review information. This paper documents the innovative utilization of a 3D game engine, the Torque Game Engine as the underlying tool and enabling technology for a design review system, the Virtual Design Review System for architectural designs. Two major elements are incorporated; 1) a 3D game engine as the driving tool for the development and implementation of design review processes, and 2) a virtual environment as the medium for design review, where visualization of design and design review information is based on sound principles of GUI design. The development of the VDRS involves two major phases; firstly, the creation of the assets and the assembly of the virtual environment, and secondly, the modification of existing functions or introducing new functionality through programming of the 3D game engine in order to support design review in a virtual environment. The features that are included in the VDRS are support for database, real-time collaboration across network, viewing and navigation modes, 3D object manipulation, parametric input, GUI, and organization for 3D objects....
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