Due to complicated situations such as node/link interference and traffic load, quality of service support in multi-hop multi-rate ad hoc networks remains a challenging issue. Furthermore, when mobility is present, because of frequent route change, it is even more difficult to maintain high level performance for existing real-time flows that may not tolerate serious performance degradation. In t...

The problem of combining task performance with network-layer routing for the detection of correlated random fields is considered. Under the assumption of the Gauss-Markov structure along a given route, an optimal data aggregation algorithm is provided, and a performance metric that captures the detection performance is derived. It is shown that the logarithm of innovation variance is a reasonab...

The increasing use of computers for saving valuable data imposes stringent reliability constraints on storage systems. Reliability improvement via use of redundancy is a common practice. As the disk capacity improves, advanced techniques such as disk scrubbing are being employed to proactively fix latent sector errors. These techniques utilize the disk idle time for reliability improvement. How...

Software-driven cloud networking is a new paradigm in orchestrating physical resources (CPU, network bandwidth, energy, storage) allocated to network functions, services, and applications, which is commonly modeled as a crosslayer network. This model carries a physical network representing the physical infrastructure, a logical network showing demands, and logical-to-physical node/link mappings...

Homogeneous wireless sensor networks (WSNs) are organized using identical sensor nodes, but the nature of WSNs operations results in an imbalanced workload on gateway sensor nodes which may lead to a hot-spot or routing hole problem. The routing hole problem can be considered as a natural result of the tree-based routing schemes that are widely used in WSNs, where all nodes construct a multi-ho...

Complex software systems for business critical and safety critical applications require tools for business performance managers to use, especially in software systems in which failure leads to major economic failure or loss of life. The software engineering community stands to benefit from metrics, analysis tools, and techniques that address software system safety from a design perspective. The...

Spontaneous facial expression recognition is significantly more challenging than recognizing posed ones. We focus on two issues that are still under-addressed in this area. First, due to the inherent subtlety, the geometric and appearance features of spontaneous expressions tend to overlap with each other, making it hard for classifiers to find effective separation boundaries. Second, the train...

Yielding precise search answer set, information extraction of the Web and proposing more accurate ranking methods of Web pages are among the open issues in search engines research area due to the ever-growing and dynamic nature of the World Wide Web. Since the performance of any Web search engine regarding the quality of the search answer set and the appropriate ranking technique is highly depe...

A kernel-based metric measuring tracking reliability that is based on discriminative components of a kernel target model and kernel mutual information is presented. The discriminative components of the kernel target model are selected by computing the log-likelihood ratios of classconditional sample densities of these components from a target region and background sampled region. The components...