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Articles 61 - 62 of 62
Full-Text Articles in Systems and Communications
Optimizing Virtual Machine I/O Performance In Cloud Environments, Tao Lu
Optimizing Virtual Machine I/O Performance In Cloud Environments, Tao Lu
Theses and Dissertations
Maintaining closeness between data sources and data consumers is crucial for workload I/O performance. In cloud environments, this kind of closeness can be violated by system administrative events and storage architecture barriers. VM migration events are frequent in cloud environments. VM migration changes VM runtime inter-connection or cache contexts, significantly degrading VM I/O performance. Virtualization is the backbone of cloud platforms. I/O virtualization adds additional hops to workload data access path, prolonging I/O latencies. I/O virtualization overheads cap the throughput of high-speed storage devices and imposes high CPU utilizations and energy consumptions to cloud infrastructures. To maintain the closeness between …
Joint Detection-State Estimation And Secure Signal Processing, Mengqi Ren
Joint Detection-State Estimation And Secure Signal Processing, Mengqi Ren
Theses and Dissertations
In this dissertation, joint detection-state estimation and secure signal processing are studied. Detection and state estimation are two important research topics in surveillance systems. The detection problems investigated in this dissertation include object detection and fault detection. The goal of object detection is to determine the presence or absence of an object under measurement uncertainty. The aim of fault detection is to determine whether or not the measurements are provided by faulty sensors. State estimation is to estimate the states of moving objects from measurements with random measurement noise or disturbance, which typically consist of their positions and velocities over …