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양길태(Giltae Yang),전호준(Hojun Jeon),전성표(Jun sung pyo),유원호(Yu Won Ho),심재륜(Shim Jae Ryun) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: 보행분석에 사용되는 기술들은 다양한 기법들이 개발되어 있으나, 외부에서 장시간 사용 가능한 방법은 매우 제한된 방법들이 제안되고 있다. 본 연구에서는 압력센서와 가속도센서 자이로센서가 내장된 스마트 인솔을 개발 하였으며, 개발된 스마트 인솔은 실시간으로 스마트폰과 연동되어 데이터를 전송하고, 분석하도록 되어 있다. 일상생활에서의 비정상 보행, 비대칭 보행을 하고 있는 사람들은 자신이 인지 할 수 있을 만큼 그 문제의 정도가 심각하지 않은 상태라면, 그 사실을 모른 채 생활한다. 이는 향후 큰 질병이 발생하는 요인이 될 수 있다. 본 연구에서는 개발된 스마트 인솔을 통해 각 발의 압력 데이터를 수집하여 미리 정의한 정상 보행 시 나타나는 압력 분포를 기준으로 비 정상 보행 여부를 판단하고 TUG(Time Up Go) 실험을 통해 사용자의 신체 나이를 판단하는 근거로 사용하고자 하였다. 일상생활에서의 스마트 인솔 사용은 시간과 공간의 제약이 없는 사용자 친화적이면서 비정상 보행 판단 및 사용자의 신체 나이를 판단하는 근거로 활용되기를 기대한다.
Development of a Screening Swallowing Algorithm for Using Ultrasonic Doppler Sensor and Microphone
Baekhee Lee,Giltae Yang,Sewon Hong,Duklyul Na,Heecheon You 대한인간공학회 2015 대한인간공학회 학술대회논문집 Vol.2015 No.10
Objective: The present study is to develop an algorithm for screening only swallowing movements out of various laryngopharyngeal movements using ultrasonic Doppler sensor and microphone. Background: Only swallowing movements need to be discriminated out of various laryngopharyngeal movements (e.g., vocalization, cough) measured by a swallowing measurement system using ultrasonic Doppler sensor for specialization in swallowing research. Method: laryngopharyngeal movement and audio signals during swallowing, cough, vocalization, respiratory, and neck movement were simultaneously measured three times to five healthy adults by ultrasonic Doppler sensor and microphone. A swallowing screening algorithm calculating movement-to-audio ratio applied with swallowing apnea was developed for screening only swallowing movements. Results: Vocalization, cough, and respiratory movements were perfectly discriminated with swallowing movements by the swallowing screening algorithm; however, neck rotation movements 73% due to occurring no laryngopharyngeal movements. Conclusion: The swallowing screening algorithm developed in the study could discriminate swallowing movements from vocalization, cough, and respiratory movements. Application: The swallowing screening algorithm can be applied to the swallowing measurement device and contribute to accurate evaluation of swallowing movements for patients with dysphagia.
Yu, Changho,Kang, Seung Rok,Yang, Giltae,Hong, Chul Un,Lee, Hyung Jong,Oh, Do Young,Kwon, Tae Kyu Pergamon Press 2015 Bio-medical materials and engineering Vol.26 No.1
<P>This study investigated the feasibility of the Infrared (IR) sensor-based walking aids for detecting the gait intention. To compensate for the defects of Force Sensing Resistors (FSRs) or force sensors, such as the velocity control problem on gait slopes, we used IR sensors to investigate knee joint anterior displacement in order to recognize the gait intention. We also measure leg muscle activities and foot pressure, in order to verify our investigation. We placed two IR sensors on the rollator center to sense left and right leg walking intentions. We took EMG signals of four leg muscles, and analyzed them. Foot pressure analysis parameters were the measured force and mean pressure. We conducted experiments on twenty young healthy adults. The results show that knee joint anterior displacement increases according to gait slope and velocity. We confirm similar results of knee joint anterior displacement through the IR sensors.</P>
Treadmill에서의 경사로 정상보행에 관한 동작분석
김영호,양길태,문무성,Kim, Youngho,Yang, Giltae,Mun, Museong 대한의용생체공학회 1997 의공학회지 Vol.18 No.1
Kinematic and kinetic studies were performed to investigate the walking characteristics on a treadmill with various slopes at the same speed of 1.25m/sec. Six different slopes of the treadmill were selected . -4%(-$2.3^{\circ}$), 0%($0^{\circ}$), 5%($2.9^{\circ}$), 10%($5.7^{\circ}$), 15%($8.6^{\circ}$), and 20%($11.3^{\circ}$). With increased slopes of the treadmill, both hip and knee flexion angles significantly increased at initial contact, and the maximum hip flexion during swing phase and the maximum knee flexion during stance phase also significantly increased Ankle dorsiflexion angle at initial contact and the maximum dorsiflexion increased with increased slopes. However, the maximum plantarflexion in early swing was slightly reduced with increased slopes. Hip extension in late stance and the maximum knee flexion in early swing was not changed sigilificantly with increased slopes. As for the vertical ground reaction force, compared to the yond level walking, both the first and the second peak forces increased, but the mid-support force decreased.
Development of an Ultrasonic Doppler Sensor-Based Swallowing Monitoring and Assessment System
Younggeun Choi(최영근),Minjae Kim(김민재),Baekhee Lee(이백희),Xiaopeng Yang,Jinwon Kim(김진원),Dohoon Kwon(권도훈),Sang-Eok Lee(이상억),HyangHee Kim(김향희),Seok In Nam(남석인),Saewon Hong(홍세원),Giltae Yang(양길태),Duk L. Na(나덕렬 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.10