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Communication‐induced checkpointing (CIC) protocols aim at finding consistent global checkpoint from which a system can safely restart without the risk of domino effect. CIC class gives processes the maximum autonomy for taking their local checkpoints while directs them to take forced checkpoints when harm patterns are detected. Such patterns can constitute of non‐causally doubled Z‐paths that violate...
In Vehicular Ad Hoc Networks (VANETs), a vehicle could be identified and tracked by eavesdropping its messages (e.g., beacons) by an adversary, since these messages contain personal information such as the location of the vehicle. This attack leads to threats on the user's location privacy. Frequent changing pseudonyms are accepted as a solution to protect the location privacy of users in VANETs....
A vehicle-mounted GPS receiver used for localization can suffer from signal blockage. To remedy to this problem, GPS/ INS integration can be considered as a solution in some cases. However, in the case of urban areas where there are severe multipath conditions, the performance degrades considerably. The last decade have seen many proposals of techniques aiming at improving the accuracy of GPS positions...
In this paper, in order to improve the Bit Error Rate (BER) of digital communication OFDM in a multipath channel, we combine the algorithm Maximal-Ratio Combining (MRC) diversity with orthogonal frequency division multiplexing (OFDM) system, the main idea of using MRC diversity is to improve the signal received at the receiver. One of the many methods which can be used to reduce the impacts multipath...
New promising technique for information hiding in vocalized Arabic text is proposed in this paper. This technique makes use of diacritics (vowel signs), which are optional to put, by showing or omitting them to hide bits. The technique is found to be very useful due to the considerable provided capacity, and because every possible diacritic in the cover text is used to hide bits. In this method, even...
The heart rate variability (HRV) spectral parameters are classically used for studying the autonomic nervous system, as they allow the evaluation of the balance between the sympathetic and parasympathetic influences on heart rhythm. However, this evaluation is based on the definition of frequency bands that are found to be controversial because of possible changes in the frequency boundaries due to...
Computational grids have the potential for solving large-scale scientific problems using heterogeneous and geographically distributed resources. However, a number of major technical hurdles must overcome before this potential can be realized. One problem that is critical to effective utilization of computational grids and gives a certain Quality of Service (QoS) for grid users is the efficient co-allocation...
Large scale systems such as computational grid are distributed computing infrastructure that can provide globally available network resources. Grid computing has emerged as a framework for supporting complex compilations over large data sets. In general, grids enable the efficient sharing and management of computing resources for the purpose of performing large complex tasks. In particular, grids...
Workload and resource management are two essential functions provided at the service level of the Grid software. To improve the global throughput of these environments, effective and efficient load balancing algorithms are fundamentally important. Although load balancing problem in classical distributed systems has been intensively studied, new challenges in Grid computing still make it an interesting...
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