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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We consider a cache updating system with a source, a cache with limitedstorage capacity and a user. There are $n$ files. The source keeps the freshestversions of the files which are updated with known rates. The cache gets freshfiles from the source, but it can only store the latest downloaded versions of$K$ files where $K\leq n$. The user gets the files either from the cache orfrom the source. If the user gets the files from the cache, the received filesmight be outdated depending on the file status at the source. If the user getsthe files directly from the source, then the received files are always fresh,but the extra transmission times between the source and the user decreases thefreshness at the user. Thus, we study the trade-off between storing the filesat the cache and directly obtaining the files from the source at the expense ofadditional transmission times. We find analytical expressions for the averagefreshness of the files at the user for both of these scenarios. Then, we findthe optimal caching status for each file (i.e., whether to store the file atthe cache or not) and the corresponding file update rates at the cache tomaximize the overall freshness at the user. We observe that when the totalupdate rate of the cache is high, caching files improves the freshness at theuser. However, when the total update rate of the cache is low, the optimalpolicy for the user is to obtain the frequently changing files and the filesthat have relatively small transmission times directly from the source.

Maximizing Information Freshness in Caching Systems with Limited Cache Storage Capacity