Earticle

Vehicular ad hoc network is an emerging new technology and a promising platform for the intelligent transportation system. The most important application of VANET is disseminating emergency messages to warn drivers in case of dangerous events. The core technique relies on the design of a broadcast scheme. In this paper, we propose a hybrid intelligent broadcast algorithm for alert message dissemination in VANETs that is called Hi-CAST. To deliver alert message effectively, the proposed Hi-CAST algorithm uses delay and probabilistic broadcast protocols together with token protocol. The performance of the Hi-CAST is evaluated through simulation and compared with that of other alert message dissemination algorithms.

Consensus algorithms that, essentially, endeavor agreement or commit on a particular transaction, are preeminent building blocks of distributed systems. Outside the FLP impossibility results in an asynchronous environment to failure detectors and many more tactics for synchrony supplements, consensus has always been a major part of concern. It poses more severe threats, in case, the distributed network possesses some arbitrary behaving (malicious) nodes. The proposed article adds up a non-faulty agreement decision to the requesting client nodes from the coordinator replicas. The work is divided into two-phases, namely, a fault-free and fair cluster formation which employs authenticated key management scheme and secondly, an authenticated agreement among the cluster heads resulting in secure and correct outcome of a transaction. We assume a two-layer hierarchy with different clusters of replicas in one layer associated with their cluster heads on another layer. Multiple levels of encryption are incorporated by means of two keys: (1) a unique pair-wise key between the processes, and (2) a communication key that provides more authenticity and enables a secure communication among the processes. The necessary correctness proof has also been presented. The protocol is robust and exhibits better efficiency for long-lived systems.

This study suggests a query conversion method based on TMDR(Topic Maps MetaData Registry) which solves heterogeneity problem distributed in networks and integrates data efficiently. TMDR is a repository which combines Topic Maps with MSO(Meta Schema Ontology). TMDR provides an integrated knowledge for solving the problem of collision between schema and data. In order to integrate the distributed data, TMDR provides global schema and it solves heterogeneity problem within the local data using query conversion method. After analyzing relationship within MSO and Topic Maps, this method allows integrated access through ML(Meta Location) which manages local data. The proposed method has several advantages. First, it can provide users who want to search unacquainted data with roadmap for intial data and schema. Second, the distribution for specific data can be checked. Third, it can find related information that is used for incorporating heterogeneous field. Fourth, the related problems such as homonym, heteronym, synonym for data can be solved using TMDR.

One major problem in the area of wireless sensor networks is the coverage problem. The coverage problem deals with the ability of the network to cover a certain area or some certain events. In this paper, we focus on the area coverage problem. We propose SRAHS, a sensing radius adjusting protocol, to deal with the problem of area coverage. In this protocol, proper sensing radius can be determined using the harmony search algorithm. Due to the proposed protocol accuracy in adjusting the nodes sensing radius, it is able to provide the full coverage in less densities. Moreover, as the result of increasing nodes density, the proposed protocol decreases both the nodes sensing radius and the energy consumption. We have simulated our protocol and simulation results show high efficiency of the proposed protocol

The Architecture for Java Universal Message Passing (A-JUMP) is a message passing implementation based on MPJ specifications. It is written purely in Java. One of the design goals of A-JUMP is interoperability, where applications written in different programming languages must be able to communicate with each other. Moreover, programmers can write parallel applications using the programming language of their choice and their applications must also be portable across different platforms. The communication backbone of A-JUMP is High Performance Computing (HPC) bus. HPC bus is based on ActiveMQ – an implementation of Java Message Service (JMS). In this research work, we have augmented multilingual support for A-JUMP that includes language bindings for C/C++ and C#. Code distribution and execution on A-JUMP framework using C/C++ and C# applications is achieved. We have also provided APIs for the respective languages and tested the inter-language communication between C/C++, C# and Java applications. Performance results of code execution and communication of C/C++, and C# implementations are also presented.