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The write-margin of the iterative decoding systems for the binary and non-binary low-density parity-check (LDPC) codes are studied in the magnetic recording system using a bit-patterned medium (BPM) R/W channel with write-errors caused by the write-head field gradient, the media switching field distribution (SFD), the magnetization fields from adjacent islands, and the island position deviation. The...
The cloud computing paradigm is now widely used thanks to its scalable on-demand resource management techniques. Since one of the most important challenges of cloud computing services is to stably provide their consumers with computing resources, it is necessary to investigate the performance of cloud computing services in actual operations. To study the realistic performance of cloud computing services,...
The magnetic recording system using a bit-patterned medium (BPM) has serious problems such as the need of the precise write-synchronization to correctly write the recording sequence on each intended island and the write-errors caused by the insufficient write field gradient, the medium switching field distribution (SFD), the demagnetization fields from adjacent islands, and the island position variation...
Recently, Cloud computing has emerged as a new computing paradigm on the Internet. Cloud computing facilitates flexible and efficient computer resource management via virtualization technologies at anytime and from anywhere, so that users can add and/or delete IT resources. Users can set up and boot the required resources and they have to pay only for the required resources. However, they have to...
Surface plasmon polariton absorption was visualized over a large area of Ti/Ag thin film to observe the distribution of electron density. A converging light was incident on the surface at the angle of maximum absorption or some angles a little apart from it. The reflectance of the light showed up such an image as only the electron density distribution was in high contrast or the thickness variation...
Virtual Machine Clusters tend to increase the amount of unused memory. We propose a remote swap management framework in a VM cluster which configures a remote swap dynamically to running VMs according to memory usage. We explain the functional requirements and the design of the framework, and demonstrate the effectiveness of the framework using prototype implementation.
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