{
  "annotation_id": "fcdb6b29-9d1c-4ca7-a1bf-a9616dc9c129",
  "date_created": "2026-03-02T18:01:07.079000Z",
  "date_modified": "2026-03-02T18:01:07.079000Z",
  "file_hash": "90cf1787249f55f3b2be62b81a7b66d1a6062df3a12a45a0a8784cbb35b98ade",
  "private": false,
  "record": {
    "abstract": "Recently, multiple time scale characteristics of heart dynamics have received\nmuch attention for distinguishing healthy and pathologic cardiac systems.\nDespite structural peculiarities of the fetal cardiovascular system, the fetal\nheart rate(FHR) displays multiple time scale characteristics similar to the\nadult heart rate due to the autorhythmicity of its different oscillatory\ntissues and its interaction with other neural controllers. In this paper, we\ninvestigate the event and time scale characteristics of the normal and two\npathologic fetal heart rate groups with the help of the new measure, called the\nUnit Time Block Entropy(UTBE), which approximates the entropy at each event and\ntime scale based on symbolic dynamics. This method enables us to match the\nmeasurement time and the number of words between fetal heart rate data sets\nsimultaneously. We find that in the small event scale and the large time scale,\nthe normal fetus and the two pathologic fetus are completely distinguished. We\nalso find that in the large event scale and the small time scale, the presumed\ndistress fetus and the acidotic distress fetus are significantly distinguished.",
    "arxiv_id": "physics/0603124",
    "authors": [
      "U. C. Lee",
      "S. Kim"
    ],
    "categories": [
      "physics.med-ph"
    ],
    "title": "Application of Unit Time Block Entropy to Fetal Distress Heart Rate",
    "url": "https://arxiv.org/abs/physics/0603124"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1c357a5b-c4bd-4a98-aab1-eab3c4958ec4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}