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Industrial applications demand for ease of deployment, reliability and low-power in wireless networks, leading to standards like IEEE802.15.4, which include time synchronized channel hopping mechanisms. Yet, scheduling of transmissions on timeslots and channels falls outside the scope of current standards. Given the application requirements above, distributed (rather than centralized) scheduling has...
This paper describes two concepts for Multichannel Immediate Multiple Access (MIMA) radio architectures for Dedicated Short-Range Communications (DSRC). Based upon an orthogonal frequency-division multiplexing (OFDM) physical layer, MIMA allows receivers to listen to all seven channels allotted for DSRC in the 5.9 GHz band and allows transmitters to send messages in any subset of the seven DSRC channels...
Data Stream Processing is a paradigm enabling the real-time processing of live data streams coming from sources like sensors, financial tickers, social media. The history of the stream is often maintained in sliding windows, analyzed to produce timely notifications to the users. A challenging issue in the development of parallel implementations of such computations is efficient dynamic memory allocation...
The recently released MPI-3.0 standard introduced a process-level shared-memory interface which enables processes within the same node to have direct load/store access to each others' memory. Such an interface allows applications to declare data structures that are shared by multiple MPI processes on the node. In this paper, we study the capabilities and performance implications of using MPI-3.0 shared...
In this paper, we outline a tiered approach to auditing information in the cloud. The approach provides perspectives on auditable events that may include compositions of independently formed audit trails. Filtering and reasoning over the audit trails can manifest potential security vulnerabilities and performance attributes as desired by stakeholders.
In recent years, the FlexRay communication protocol been promoted as a de facto standard for in-vehicular communication. In the FlexRay protocol, the communication timeline is organized as a sequence of four segments, whereas the static segment defines a set of slots specifically designed for the transmission of synchronous messages. In this paper, we investigate the following problem: “how to allocate...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
In this paper, we address the issue of transmission power control (TPC) in wireless ad hoc networks. Power control plays an important role in energy saving and network performance enhancement. However, the existing TPC schemes either face the problem of hidden and exposed terminal or have additional hardware requirements. We propose a novel distributed power control protocol, called Receiver Initiated...
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