전외측 대퇴 유리 피판을 이용한 아킬레스건 부위 연부조직 결손의 재건

강민혁,홍준표 大韓微細手術學會 2002 Archives of reconstructive microsurgery Vol.11 No.2

Influences of Doorway Stretching with Scapular Posterior Tilt on Glenohumeral Internal Rotation Range of Motion

강민혁 국제물리치료연구학회 2022 Journal of International Academy of Physical Ther Vol.13 No.2

Background: Pectoralis minor tightness is associated with reduced glenohumeral internal rotation range of motion (ROM) and scapular anterior tilt alignment. However, the synergistic effects of the pectoralis minor stretching exercise and scapular posterior tilt strategy on glenohumeral internal rotation ROM and pectoralis minor length remain unexplored. Objectives: This study examined the effects of doorway stretching with scapular posterior tilt on pectoralis minor length, scapular alignment, and glenohumeral internal rotation ROM. Design: A case series study. Methods: Fifteen adults with pectoralis minor tightness performed doorway stretching with scapular posterior tilt. Pectoralis minor length, acromion–table distance, and glenohumeral internal rotation ROM were measured before and immediately after stretching. The pectoralis minor length was calculated using the pectoralis minor index. The measured variables were analyzed using a paired t-test. Results: While the pectoralis minor index and glenohumeral internal rotation ROM significantly increased, the acromion–table distance markedly decreased after doorway stretching with scapular posterior tilt (P<.05). Conclusion: Based on the present findings, doorway stretching with scapular posterior tilt could be an effective exercise for increasing glenohumeral internal rotation ROM and pectoralis minor length.

수동적 어깨뼈 자세 교정 전략과 능동적 어깨뼈 뒤쪽 기울임 전략이 어깨뼈 주변근육 활성도에 미치는 영향

강민혁 대한고유수용성신경근촉진법학회 2022 PNF and Movement Vol.20 No.2

Purpose: The purpose of this study was to compare the effects of passive scapular upward rotation and posterior tilt and active scapular posterior tilt on the muscle activity of the upper trapezius (UT), lower trapezius (LT), and serratus anterior (SA). Methods: Fifteen healthy subjects performed general arm elevation, arm elevation with passive scapular upward rotation and posterior tilt, and arm elevation with active scapular posterior tilt. For active scapular posterior tilt, the subjects were trained in this movement using visual biofeedback and a motion sensor. During each arm elevation condition, electromyography was used to measure the muscle activity of the UT, LT, and SA. The measured data were analyzed using a one-way repeated ANOVA. Results: LT muscle activity was significantly increased during arm elevation with active scapular posterior tilt compared to both general arm elevation and arm elevation with passive scapular upward rotation and posterior tilt (p < 0.05). SA muscle activity was greater during arm elevation with passive scapular upward rotation and posterior tilt than during general arm elevation (p < 0.05). There was no significant change in UT muscle activity among the tested arm elevation conditions (p > 0.05). Conclusion: Performing arm elevation with active scapular posterior tilt and performing arm elevation with passive scapular upward rotation and posterior tilt may be useful strategies for increasing muscle activation of the LT and SA, respectively.

추자도 마이크로그리드 구축에 관한 연구

강민혁,김동완,김일환 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.1

At present, domestic small islands mainly supply electric power using diesel generators. However, diesel generatorscan cause instability of the power system due to slow response on power load fluctuation, and cause environmentalproblems due to the emission of carbon gas by using fossil fuels. In order to overcome this problem, this paper proposesa method to establish an optimal microgrid by introducing solar power, wind power, and energy storage device toChujado Island, which is supplied with electric power through a diesel generator. The economical optimum capacity ofeach distributed power source is calculated by using HOMER(Hybrid Optimization Model for Multiple Energy Resources)program and the proposed microgrid is validated by using PSCAD/EMTDC(Power Systems Computer Aided Design/Electromagnetic Transients including DC) program which can analyze system stability. 현재 국내 소규모 섬들은 주로 디젤발전기를 이용하여 전력을 공급하고 있다. 그러나 디젤발전기는 부하변동에 대한 속응성이 느리기 때문에 계통을 불안정하게 할 수 있고, 화석연료 사용에 의한 탄소가스 배출로 환경문제를 야기한다. 이러한 문제를 극복하기 위하여 본 논문에서는 주전원을 디젤발전기를 통하여 전력을 공급받고 있는 추자도에 태양광발전, 풍력발전,에너지저장장치를 도입하여 최적의 마이크로그리드를 구축하는 방안을 제안한다. 이때 각 분산형 전원의 경제적 최적용량은HOMER(Hybrid Optimization Model for Multiple Energy Resources) 프로그램을 이용하여 산정하였고, 이를 계통의 안정성을 분석할 수 있는 PSCAD/EMTDC(Power Systems Computer Aided Design/ Electromagnetic Transients including DC)프로그램을 활용하여 제안한 마이크로그리드의 타당성을 입증한다.

Comparison of Foot Posture, Joint Position Sense, Dynamic Balance, and Plantar Pressure between Young Adults with and without Obesity

강민혁,문동철,박두진 KEMA학회 2022 근골격계과학기술학회 Vol.6 No.2

Background Obesity has been suggested as a social issue, but problems in the foot and ankle have not been clearly identified in people with obesity. Purpose To compare foot posture, joint position sense, dynamic balance ability, and plantar pressure in obesity group (OG) and normal weight group (NWG) Study design Cross-sectional study Methods This study included 52 adults (26 for OG and 26 for NWG). All subjects had their foot posture index-6 and joint position sense (20° of inversion, 20° of plantar flexion, 10° of eversion, and 10° of dorsiflexion) measured, as well as their dynamic balance ability using a dynamic balance test and plantar pressure of the medial forefoot during the dynamic balance test. These variables were compared between OG and NWG. Results OG showed significantly larger joint position sense error for eversion and increased plantar pressure of the medial forefoot during the dynamic balance test in the posteromedial direction. Significant differences were unobserved in other variables between the two groups. Conclusions Adults with obesity have deficits in joint position sense and increased plantar pressure of the medial forefoot.

재난안전 분야 엣지컴퓨팅 기술 동향

강민혁,전상운 한국통신학회 2022 정보와 통신 Vol.39 No.6

최근 4차 산업혁명으로 인한 IT기술의 발달은 일상생활뿐만 아니라 국방, 산업, 농업 등 여러 분야에서 다양한 기기들의 인터넷 연결을 가능하게 하였다. 특히 엣지컴퓨팅 기술은 여러 방식으로 수집한 데이터를 중앙의 서버로 전송하지 않고 네트워크의 끝단(엣지)에서 처리하는 기술이다. 더 나아가 단순히 데이터 처리뿐만 아니라 컴퓨팅, 메모리, 대역폭, 애플리케이션과 같은 여러 리소스들을 엣지에 배치함으로써 전송 지연과 대역폭 제한을 감소시킬 수 있다. 대표적으로 커넥티드카와 같이 실시간처리를 요하는 분야에서 활용되고 있으며, 이 외에도 네트워크 상황이 좋지 않거나 빠른 대응속도가 필요한 분야에서 엣지컴퓨팅에 주목하고 있다. 엣지컴퓨팅 기술은 다른 IT기술과 함께 자연재해나 재난을 예방하고 대처하는데 사용될 수 있다. 대표적인 예로, 다양한 종류의 센서를 통해 수집된 데이터를 활용해서 재해나 재난을 예측하거나, 실시간으로 재해 상황을 모니터링 할 수 있다. 본 고에서는 이러한 엣지컴퓨팅 기술에 대해 설명하고, 국내외 재난안전 분야에서 활용한 사례 및 동향에 대해 소개하고자 한다.

Preparation of Block Copolymers Via Nitroxide Mediated "Living" Radical Polymerization

강민혁,문봉진 한국고분자학회 2004 한국고분자학회 학술대회 연구논문 초록집 Vol.29 No.2

Effects of Ultrasound Biofeedback on EMG Activity of Trunk Stabilizer Muscles during Lifting Tasks

강민혁 국제물리치료연구학회 2017 Journal of International Academy of Physical Ther Vol.8 No.3

The purpose of this study was to examine the effects of abdominal hollowing with ultrasound biofeedback on multifidus and transversus abdominis/internal oblique muscle activities during lifting tasks. This study recruited 12 healthy men. All subjects received training on expiration without and with abdominal hollowing with ultrasound biofeedback. After receiving training for each condition, the thickness of transversus abdominis was measured using ultrasound, and then, electromyography activities of transversus abdominis/internal oblique and multifidus during lifting tasks were measured using a surface electromyography system. The differences in thickness of transversus abdominis and electromyography activities of transversus abdominis/ internal oblique and multifidus between the two conditions were analyzed using paired t-test. Thickness of transversus abdominis and transversus abdominis/internal oblique and multifidus activities were significantly increased during expiration with abdominal hollowing with ultrasound biofeedback compared to during expiration without abdominal hollowing (p < 0.05). These findings suggest that abdominal hollowing with ultrasound biofeedback is effective in increasing trunk stabilizer muscle activities during both static and dynamic tasks such as lifting.

응급 자가혈관 이식으로 치료한 외상성 총경동맥 손상 1예

강민혁,강영,정한진,장이찬,이동욱 대한이비인후과학회 2021 대한이비인후과학회지 두경부외과학 Vol.64 No.5

Cervical area is not protected by bony structures, so traumatic neck injuries can occur frequently. Emergent surgical exploration is necessary for immediate life threatening signs orsymptoms, such as expanding hematoma, hematoma with hemodynamic instability, hemomediastinum,hemothorax or hypovolemic shock. Carotid artery reconstruction may be requiredin some cases of common carotid or internal carotid artery injury because these injuries coulddevelop fatal or serious complications. We report here a case of common carotid artery injurytreated by saphenous vein autograft in an emergent situationKorean J Otorhinolaryngol-Head

풍력발전기의 출력 안정화를 위한 에너지 저장장치 용량 산정 사례연구

강민혁,채상헌,안진홍,김일환 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.6

In accordance with the policy of local government, the large scale of wind farms have been installed in Jeju power system. However, The intermittent characteristics of wind power output may cause grid voltage and frequency variation, especially in weak power system. One of the solution to solve this problem is installation of Energy storage system (ESS). In this case, the ESS will regulate the active power generated from wind farm to mitigate fluctuation. Actually, the local government of Jeju island constructed ESS connected to Hangwon wind turbine in 2016. From this point, this paper analyzes requirement capacity of ESS to mitigate wind power fluctuation based on measured data from Hangwon wind turbine and ESS. The simulation results will be carried out by Matlab program.