A Low-Cost Multimodal Detector for Emergency Signals and Closed-Loop Search Guidance: A Prototype Study Using Controlled RF, Audio, and Vibration Tests. Journal of High School Research, [S. l.], v. 3, n. 1, p. 91326003–1:91326003, 2026. DOI: 10.70671/06bafj89. Disponível em: https://jhsr.net/index.php/jhsr/article/view/46. Acesso em: 26 jul. 2026.