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메트로놈을 사용한 일정한 페이스의 등장성 운동시 근활성도 및 근육 피로도 관찰
최준원,송창현,김종민,정운모,김원경,김한성,Jun won Choi,Chang hyun Song,Jong min Kim,Woon Mo Jung,Won Gyeong Kim,Han Sung Kim 대한의용생체공학회 2023 의공학회지 Vol.44 No.4
This study attempted to observe muscle activity and muscle fatigue among isotonic exercise of Biceps Brachii and Deltoidus Medius, which correspond to upper limb muscles, using metronome. For the experiment, 13 adult men participated to evaluate biosignals (ECG, EMG). For quantitative evaluation, 1RM and MVIC test were carried out and a constant pace isotonic excise session was conducted. Five sets of exercise were performed, and each set proceeded to the failure point while the speed condition (30bpm) was assigned. As a result of the experiment, muscle activity in both muscles was significantly reduced in fifth set compared to first set. Muscle fatigue has been confirmed to occur at a significant level within the set, but there was only a significant difference in both muscles in the first and second sets between sets. This is similar to the results of previous studies that gives the same rest time(2min), but further research is needed to see if the conditions for the number of repetitions are affected. Based on the recent increase of interest in muscle strength exercise, this study was conducted to observe the results by varying the conditions of common exercise.
관혈적 정복 및 내고정을 이용한 관절내 종골 골절의 치료
최준원,최준철,이영상,나화엽,김우성,한상호,Choi, Jun-Won,Choi, Joon-Cheol,Lee, Young-Sang,Na, Hwa-Yeop,Kim, Woo-Sung,Han, Sang-Ho 대한족부족관절학회 2007 대한족부족관절학회지 Vol.11 No.2
Purpose: To evaluate the clinical outcomes and radiographic results of open reduction and internal fixation for intraarticular calcaneal fractures. Materials and Methods: We reviewed 20 cases of calcaneal fractures managed with open reduction and internal fixation from March 2003 to January 2005. We used the computed tomographic classification system proposed by Sanders et al to classify these fractures. Preoperative and postoperative Bohler's angle, heel height (calcaneal facet height) and calcaneal length, calcaneal width were measured. The Creighton-Nebraska Health Foundation Assessment score was used for clinical evaluation. Results: There were 12 cases of type II fractures, 5 of type III fractures and 3 of type IV fractures. The mean clinical score was 84.3 for type II, 82.6 for type III and 56.1 for type IV. The mean preoperative $B{\ddot{o}}hler$ angle was $6.1^{\circ}$ and final was $22.8^{\circ}$. The mean preoperative calcaneal facet height was 76.6 mm and final was 80.3 mm (The mean calcaneal facet height was changed from preop 76.6 mm to postop 80.3 mm). The mean preoperative calcaneal length was 88.2 mm and final was 92.6 mm. The mean preoperative width was 38.1 mm and final was 35.6 mm. Conclusion: Open reduction and internal fixation showed good results for type II and III fractures, but for type IV fractures the clinical result was significantly worse than the other types. However, type IV fractures still had restoration of (should be restored in) $B{\ddot{o}}hler's$ angle, calcaneal facet height, calcaneal length and width which may be helpful in later subtalar fusion.
차량 시뮬레이터 환경 내 직진코스에서 전기 자극에 따른 운전자 핸들 변화 정도 비교
최준원(Jun Won Choi),김종민(Jong Min Kim),송창현(Chang Hyun Song),김한성(Han Sung Kim) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
This study aims to compare the degree of change in the drivers handle according to electrical stimulation on the straight course in the vehicle simulator environment. As the number of traffic accidents increases every year, many methods are being implemented to solve the problem. In this study, the change in driving performance ability is observed by comparing the degree of change in the handle through TENS stimulation. This study was conducted on 23 healthy adult men (age: 24.17±2.12, Height: 174.54±5.91, and Weight: 70.4±8.59). A total of two road tests were conducted, ECG and d2 tests were conducted for each section, and the degree of change in the handle was analyzed through the location of the vehicle, a parameter that can be collected from the vehicle simulator. The heart rate and low frequency levels tended to increase with TENS stimulation, and the d2 test also tended to increase. The change in vehicle position was small according to TENS stimulation, and the degree of change in the handle tended to decrease. As a result, TENS stimulation leads to activation of the sympathetic nervous system, and as the degree of change in the handle decreases, driving performance seems to have improved.