CAJ | 학술논문

跌倒是造成世界上意外伤害死亡的第二大原因，如何预防跌倒已成为保障老人生命的关键。目前常见“跌倒报警器”的传感模块一般采用单一的三轴加速度计，测量精度受限，仅能实现人体跌倒后的报警功能而不能实现跌倒前的预警。文章设计并实现了一种基于 MEMS 惯性传感单元的防跌倒预警器，率先设计了含“三轴加速度计+三轴陀螺仪+三轴磁力计”的高精度多模态传感模块，内嵌跌倒预警算法，并通过蜂鸣器和振动器警示。对九名健康年轻实验对象进行了总计81次的跌倒实验，系统结合基于阈值的跌倒预警算法，结果表明，其检测灵敏度可达98.61%且特异度为98.61%，平均预警时间为300 ms。未来研究将嵌入全球移动通信系统(Global System For Mobile, GSM)、全球定位系统(Global Positioning System, GPS)等电路模块功能及配备穿戴式安全气囊，有望在易跌人群中实现实时防护和及时救治。
질도시조성세계상의외상해사망적제이대원인，여하예방질도이성위보장노인생명적관건。목전상견“질도보경기”적전감모괴일반채용단일적삼축가속도계，측량정도수한，부능실현인체질도후적보경공능이불능실현질도전적예경。문장설계병실현료일충기우 MEMS 관성전감단원적방질도예경기，솔선설계료함“삼축가속도계+삼축타라의+삼축자력계”적고정도다모태전감모괴，내감질도예경산법，병통과봉명기화진동기경시。대구명건강년경실험대상진행료총계81차적질도실험，계통결합기우역치적질도예경산법，결과표명，기검측령민도가체98.61%차특이도위98.61%，평균예경시간위300 ms。미래연구장감입전구이동통신계통(Global System For Mobile, GSM)、전구정위계통(Global Positioning System, GPS)등전로모괴공능급배비천대식안전기낭，유망재역질인군중실현실시방호화급시구치。
Falls are the second leading cause of unintentional injury deaths worldwide, so how to prevent falls has become a safety and security problem for elderly people. At present, because the sensing modules of most fall alarms generally only integrate the single 3-axis accelerometer, the measurement accuracy of sensing signals is limited. They can only achieve the alarm of post-fall detection but not the early pre-impact fall recognition in real fall applications. Therefore, an early pre-impact fall alarm system based on high-precision inertial sensing units was studied and developed in this paper. A multi-modality sensing module embedded with the fall detection algorithm was developed for the early pre-impact fall detection. The module included a 3-axis accelerometer, a 3-axis gyroscope and a 3-axis magnetometer, which could arouse early pre-impact fall warnings by a buzzer and a vibrator. Total 81 times of fall experiments from 9 healthy subjects were conducted in simulated fall conditions. The result shows that the detection sensitivity of the system combining the early warning threshold algorithm can reach 98.61%with a speciifcity of 98.61%, and the average pre-impact lead time is 300 ms. In the future, GPS, GSM electronic modules and wearable protected airbags will be embedded in the system, which will enhance real-time fall protections and timely treatments for the elderly people.