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  2. Carrier-sense multiple access - Wikipedia

    en.wikipedia.org/wiki/Carrier-sense_multiple_access

    P-persistent This approach lies between the 1-persistent and non-persistent CSMA access modes. [1] When the transmitting node is ready to transmit data, it senses the transmission medium for idle or busy. If idle, then it transmits immediately. If busy, then it senses the transmission medium continuously until it becomes idle, then transmits ...

  3. Persistent homology - Wikipedia

    en.wikipedia.org/wiki/Persistent_homology

    Persistent homology is a method for computing topological features of a space at different spatial resolutions. More persistent features are detected over a wide range of spatial scales and are deemed more likely to represent true features of the underlying space rather than artifacts of sampling, noise, or particular choice of parameters.

  4. Persistent homology group - Wikipedia

    en.wikipedia.org/wiki/Persistent_homology_group

    Persistent homology groups were first introduced by Herbert Edelsbrunner, David Letscher, and Afra Zomorodian in a 2002 paper Topological Persistence and Simplification, one of the foundational papers in the fields of persistent homology and topological data analysis, [1] based largely on the persistence barcodes and the persistence algorithm ...

  5. Persistence module - Wikipedia

    en.wikipedia.org/wiki/Persistence_Module

    In the worst case, the computational complexity of multidimensional persistent homology is exponential. [ 18 ] The most common way to measure the similarity of two multiparameter persistence modules is using the interleaving distance , which is an extension of the bottleneck distance.

  6. HTTP persistent connection - Wikipedia

    en.wikipedia.org/wiki/HTTP_persistent_connection

    Under HTTP 1.0, connections should always be closed by the server after sending the response. [1]Since at least late 1995, [2] developers of popular products (browsers, web servers, etc.) using HTTP/1.0, started to add an unofficial extension (to the protocol) named "keep-alive" in order to allow the reuse of a connection for multiple requests/responses.

  7. List of space groups - Wikipedia

    en.wikipedia.org/wiki/List_of_space_groups

    The possible screw axes are: 2 1, 3 1, 3 2, 4 1, 4 2, 4 3, 6 1, 6 2, 6 3, 6 4, and 6 5. Wherever there is both a rotation or screw axis n and a mirror or glide plane m along the same crystallographic direction, they are represented as a fraction n m {\textstyle {\frac {n}{m}}} or n/m .

  8. Trump administration ordered to restore removed CDC and FDA ...

    www.aol.com/news/trump-administration-ordered...

    A federal judge on Tuesday ordered U.S. health agencies to restore websites that they abruptly took offline in response to an executive order by President Donald Trump telling them to scrub ...

  9. Persistent memory - Wikipedia

    en.wikipedia.org/wiki/Persistent_memory

    The read-of-non-persistent-write problem is found for lock-free programs on persistent memory. As compare-and-swap (CAS) operations do not persist the written values to persistent memory, the modified data can be made visible by the cache coherence protocol to a concurrent observer before the modified data can be observed by a crash observer at persistent memory.