Sitting Pressure Analysis Using A Partial Calibrated Pressure Mat
Bibliographic record
Abstract
Pressure mapping is a non-invasive and reliable method for clinical assessment of the risk of pressure injury. A pressure mat is a common tool for sitting pressure measurement. Misuse or misalignment of inflator bag can form a partially calibrated pressure mat and generate unreliable and imprecise measurement results. The objectives of this study were (1) to develop a procedure that can improve the applicability of a partially operational pressure mat and (2) to assess the precision of the proposed procedure by validating the sitting pressure distribution and center of pressure (COP) against the simultaneous measurement results of a fully calibrated pressure mat. To this end, first, recordings of pressure sensor elements were sorted by the sensor element position. Second, the recordings obtained by the non-calibrated areas were corrected to zero while the recordings of calibrated areas were kept without any correction. Third, the recordings of calibrated and non-calibrated areas were composed accordingly to form the nominal readings of a fully calibrated pressure mat. Then, the nominal readings were processed by our proposed graphical user interface (GUI) which contained the standard pressure data processing methods used by the relevant commercial pressure mat. Finally, the statistical parameters of pressure distribution and COP were calculated. The proposed procedure was validated by the data measured with two "FSA" pressure mats (Vista Medical Ltd, Canada). One partially calibrated and one fully calibrated pressure mats were placed fully aligned to each other on a flat surface. Both pressure mats recorded synchronously in the following experimental tests: 1) a concentrated weight was applied to predetermined positions to investigate the COP offset of two pressure mats and 2) five participants sat still on the pressure mats 5 times each. The COPs obtained for the five predetermined positions measured by two pressure mats were fitted with a least square method. The fitted origin offset of two mats in the X and Y axis is 2.4 mm and 9.35 mm, respectively. For the sitting pressure measurement, the two pressure mats had the same readings of maximum pressure and similar readings of mean pressure, variance and standard deviation with the difference of less than 10% of the reading of the fully calibrated pressure mat. Similar differences were observed in COP value of X and Y axis. In conclusion, our developed procedure together with a GUI could be a suitable solution to the data processing of a partially calibration pressure mat.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".