수면 환경에 대한 균형을 맞춰 주는 기능성 침대 모듈의 개발 = Development of a Functional Bed Module for Postural Balance During Sleep

다국어 초록 (Multilingual Abstract)

Sleep is a very important part of human life, accounting for about one-third of the day. During sleep, we restore physical and mental vitality, a process in which the biological clock in our brain plays an active role—promoting activity during the day and sleep at night. Therefore, insufficient sleep can cause numerous physical and mental problems. Such sleep disorders are also linked to sleeping posture; maintaining an improper posture during sleep can aggravate these disorders. Hence, correcting sleep posture is important, and various studies are being conducted for this purpose.
In this study evaluated the functional performance and user acceptability of a newly developed smart bed designed to support posture adjustment, thermal regulation, and pressure-based feedback during sleep. The maximum operating duration of the bed was 8 hours 25 seconds, demonstrating only a 0.08% deviation from commercially used sleep-bed operating times, indicating suitability for standard sleep duration. Structural testing confirmed that the system withstood loads exceeding 135 kg, supporting its applicability for general adult users. The panel modules provided a maximum vertical displacement of 100.42 mm, allowing adaptive height adjustments corresponding to cervical and lumbar curvature, with a force resolution of 4.33 kgf, enabling fine-graded sequential pressure application. The pressure-sensing error of ±2.288 demonstrated the system’s ability to estimate posture with high accuracy. The thermal control unit exhibited an error margin of ±2.2 °C, outperforming the ±5 °C tolerance commonly observed in commercial heating devices. Mechanical operating noise measured 37.9 dB, indicating suitability for nighttime use. Skin-temperature measurement demonstrated an error of 0.28 °C, supporting its use in real-time thermal regulation.
User-experience evaluations further demonstrated strong performance. The system received high scores for automatic posture adjustment (6.3), ease of adjusting supine height (6.0), perceived comfort when lying down (6.5), thermal appropriateness (6.2), and operating-noise acceptability (6.6). Although convenience of function settings showed a relatively lower score (5.8), similar to the control bed (5.6), participants noted this was due to unfamiliarity with the control interface. The developed system outperformed the comparison product in suitability for sleep environments (6.7 vs. 4.5) and overall satisfaction (6.5), indicating strong potential for real-world application.
While the technical and usability evaluations support the feasibility of the developed system, the study did not assess clinical outcomes related to sleep quality. Future clinical trials are required to verify whether the system can lead to measurable improvements in actual sleep performance.

목차 (Table of Contents)

• I. 서 론 1
• 1.1 연구 배경 1
• Ⅱ. 본론 5
• 2.1 개발의 개요 5
• 2.2 개발을 위한 선행연구내역 7
• 2.2.1 수면 중 체온 변화 추이 실험 진행 및 결과 7
• 2.2.2 수면 중 체압 분포 추이 실험 8
• 2.3 개발의 방법 10
• 2.3.1 본체의 제작 10
• 2.3.2 온도측정 모듈의 제작 13
• 2.3.3 제어 파트 및 조정 알고리즘의 개발 17
• 2.3.4 개발 성능 평가 24
• 2.3.5 사용 만족도 평가 27
• Ⅲ. 결과 29
• Ⅳ. 결론 35
• 참 고 문 헌 37
• 영 문 초 록 39