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등척성 엉덩관절 모음 및 벌림 시 골반 벨트가 엉덩관절 근육의 근력과 복부 근육 근 활성도에 미치는 영향
강민혁(Min-hyeok Kang),오재섭(Jae-seop Oh) 한국전문물리치료학회 2017 한국전문물리치료학회지 Vol.24 No.2
Background: To improve lumbo-pelvic stability, passive support devices (i.e., a pelvic belt) are recommended clinically. Nevertheless, to understand the influence of passive support on lumbo-pelvic stability, it is necessary to examine the influence of a pelvic belt on the abdominal and hip abductor muscles. Objects: To examine the effects of a pelvic belt on the forces of the hip adductor and abductor muscles and activity of the abdominal muscles during isometric hip adduction and abduction. Methods: This study recruited 14 healthy men. All subjects performed isometric hip adduction and abduction with and without a pelvic belt in a neutral hip position. Load cells, wrapped with a non-elastic belt, were placed above the medial and lateral malleoli of the dominant leg to measure the muscle forces of the hip adductors and abductors, respectively. The forces of the hip adductors and abductors were measured using a load cell during isometric hip adduction and abduction, while the electromyographic activities of the bilateral rectus abdominis, internal oblique, and external oblique muscles were measured. Results: The forces generated by the hip adductors and abductors were significantly greater with the pelvic belt than without (p<.05). No significant differences in abdominal muscle activities between the two conditions were found (p>.05). Conclusion: These findings suggest that use of a pelvic belt could lead to effective strengthening exercise of hip muscles in individuals with sacroiliac joint pain.
강민혁(Minhyuk Kang),전상운(Sang-Woon Jeon) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문은 다수의 센서 노드가 무작위로 배치된 무선 센서 네트워크(WSN, Wireless Sensor Network) 환경에서 UAV 를 이용한 비용 효율적인 데이터 수집 방법을 연구하였다. 제안기법은 먼저 센서 노드들을 임의의 클러스터로 나눈 후, 각 클러스터의 클러스터 헤드를 선출한다. 각 클러스터의 노드들은 클러스터 헤드로 다중홉 전송을 통해 수집 데이터를 전달하며, 마지막으로 UAV 가 클러스터 헤드들을 방문하여 최종적으로 데이터를 수집한다. 모의실험을 통해 제안 기법이 기존의 UAV 를 활용하지 않는 다중홉 라우팅 방식과 UAV 만을 활용하여 데이터를 수집하는 방식에 비해 향상된 효율을 달성함을 확인하였다.
하위 무릎뼈를 지난 성인들을 대상으로 쪼그려 앉기 운동 시 하위 무릎뼈 스트랩을 이용한 무릎뼈 높이 변화가 넙다리네갈래근의 근 활성도에 미치는 영향
강민혁(Min-hyeok Kang),김지원(Ji-won Kim),윤지연(Ji-yeon Yoon),장준혁(Jun-hyeok Jang),오재섭(Jae-seop Oh) 한국전문물리치료학회 2012 한국전문물리치료학회지 Vol.19 No.1
The purpose of this study was to assess the influence of patellar height on quadriceps muscles’ electromyography (EMG) activity during a squat exercise in adults with patella baja, For the study, we recruited 15 volunteers who had patella baja on the right side. We measured the EMG activity of the right rectus femoris, vastus medialis oblique, and vastus lateralis muscles during squat exercises under two conditions, specifically with and without an infra-patellar strap. The infra-patellar strap was applied below the tested patella to elevate the patella to a normal height. A paired t-test was used to compare the effects of patella height on EMG activity of the quadriceps muscles. The EMG activity of the rectus femoris (RF), vastus medialis oblique (VMO), and vastus lateralis (VL) muscles were significantly decreased during the squat exercise with the infra-patellar strap compared to the same exercise without the infra-patellar strap (p<.05), while the VMO/VL ratio was not different significantly between two conditions (p>.05). The findings of this study suggest that an infra-patellar strap may benefit people with patellar baja, as changes in patellar height could improve the efficiency of the quadriceps muscles.
양발에 부착된 IMU모듈을 활용한 보행자 추측 항법 알고리즘 연구
강민혁 ( Min-hyeok Kang ),김재윤 ( Jae-yun Kim ),조찬웅 ( Chan-woong Jo ),이채우 ( Chae-woo Lee ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2
본 논문은 보행자의 각 발에 부착된 2개의 IMU(Inertial Measurement Unit) 정보를 융합하여 위치 추적 성능을 향상시키는 보행자 추측 항법 알고리즘을 제안하였다. 센서내의 방향드리프트로 인해 IMU기반 보행자 위치추적은 시간이 지남에 따라 성능이 크게 저하된다. 제안하는 알고리즘은 방향 드리프트로 인해 각 발의 이동경로가 발산하는 점에 착안하여, 보폭이 일정 값을 초과할 시 이를 보정하고 사용자의 위치를 계산한다. 실험을 통해 제안하는 알고리즘이 방향 드리프트를 효과적으로 감소시키는 것을 확인하였다.
전신 기울기 운동 시 시각적 바이오피드백이 올바른 자세 유지 시간과 체간 근육의 근활성도에 미치는 영향
강민혁(Min-hyeok Kang),윤지연(Ji-yeon Yoon),양재락(Jae-lak Yang),장준혁(Jun-hyeok Jang),정도헌(Doh-heon Jung),오재섭(Jae-seop Oh) 한국전문물리치료학회 2011 한국전문물리치료학회지 Vol.18 No.1
The purpose of this study was to assess visual biofeedback's influence on trunk muscles' (EMG) activity and endurance holding time for correct position during whole-body tilt exercise. For the study, we recruited 14 volunteers who showed no symptom of lumbar disease during medical tests. We measured the EMG activity of their rectus abdominis, external abdominal oblique, internal abdominal oblique and erector spinae muscles, and their endurance holding time for correct position during 40˚ anterior and posterior whole-body tilt under two conditions: whole-body tilt with and without visual biofeedback. Resistance with gravitational force on the trunk during whole-body tilt was applied by using a device that had a monitor on which the subjects could check their alignment and that sounded an alarm if a subject's alignment collapsed. The study showed an increase in the EMG activity of external abdominal oblique, internal abdominal oblique/rectus abdominis ratio and endurance holding time for correct position during both 40˚ anterior and posterior whole-body tilt with visual biofeedback compared with without visual biofeedback (p<.05). We suggest that the whole-body tilt exercise with visual biofeedback could be a beneficial strategy for selectively strengthening the internal abdominal oblique muscle and minimizing the rectus abdominis muscle's activity while maintaining correct alignment during whole-body tilt exercise.