English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

MEMS storage devices are new non-volatile secondary storages that haveoutstanding advantages over magnetic disks. MEMS storage devices, however, aremuch different from magnetic disks in the structure and access characteristics.They have thousands of heads called probe tips and provide the following twomajor access facilities: (1) flexibility: freely selecting a set of probe tipsfor accessing data, (2) parallelism: simultaneously reading and writing datawith the set of probe tips selected. Due to these characteristics, it isnontrivial to find data placements that fully utilize the capability of MEMSstorage devices. In this paper, we propose a simple logical model called theRegion-Sector (RS) model that abstracts major characteristics affecting dataretrieval performance, such as flexibility and parallelism, from the physicalMEMS storage model. We also suggest heuristic data placement strategies basedon the RS model and derive new data placements for relational data andtwo-dimensional spatial data by using those strategies. Experimental resultsshow that the proposed data placements improve the data retrieval performanceby up to 4.0 times for relational data and by up to 4.8 times fortwo-dimensional spatial data of approximately 320 Mbytes compared with those ofexisting data placements. Further, these improvements are expected to be moremarked as the database size grows.

A Logical Model and Data Placement Strategies for MEMS Storage Devices