Noise level and its perception by commuters in urban buses of Curitiba
Bibliographic record
Abstract
The aim of this study was to evaluate the sound pressure level in commuter buses, as well as investigate the resulting hearing perception of commuters about the bus noise levels. This was accomplished by measuring the noise levels inside city buses as well as through a questionnaire completed by 808 commuters. This questionnaire requested information about vehicle characterization, noise perception inside the buses (noise presence, intensity, causes and effects), bus stations, and bus stops in different areas of Curitiba. The maximum noise level inside the vehicles was 81 dB (A), which is a high value since the World Health Organization (WHO) considers that a sound above 70 dB (A) may be harmful to human beings. The survey showed that although the noise was not considered as one of the main factors which cause discomfort in buses, commuters were able to identify the noise sources inside the buses. Commuters aslo complained about the noxious effects of the noise, such as irritability and headaches.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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".