@article{2369,
  author = {Michal Kvet, Karol Matiaško},
  title = {Managing Undefined Values in Temporal Environment},
  journal = {Journal of Intelligent Computing},
  year = {2017},
  volume = {8},
  number = {4},
  doi = {},
  url = {http://www.dline.info/jic/fulltext/v8n4/jicv8n4_2.pdf},
  abstract = {Database systems and temporal extension is core part of the data and information system processing. However,
temporal paradigm has never been standardized. Object level temporal approach is based on extension of the primary key,
whereas our approach uses column granularity, thanks to that, sensorial data with various granularity and frequency of
changes can be effectively managed and accessed. Moreover, significant performance parameter is just index structure and
mostly used B+tree. Such developed index cannot manage and deal with NULL values, therefore in this paper, we propose
effective solution for storing undefined attribute values as well as time attributes delimiting validity.},
}