단계별 경적

김범철(Bumchul Kim),최지원(Jiwon Choi),Juneon Park,김대민(Daemin Kim) 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

DEM을 이용한 호퍼 유동에 의한 상하부에서의 편석 현상에 대한 해석

김범철(Bumchul Kim),박준영(Junyoung Park) 한국기계가공학회 2018 한국기계가공학회 춘추계학술대회 논문집 Vol.2018 No.4

한국 육상 100m 허들의 성장기: 한국 신기록 변천을 중심으로

정범철 ( Chung Bumchul ),이정호 ( Lee Jungho ),김경지 ( Kim Kyung-ji ) 한국체육대학교 체육과학연구소 2020 스포츠사이언스 Vol.38 No.1

이 연구는 한국 육상경기 100m 허들 종목의 최초 한국 신기록 수립 시점인 1969년부터 2019년까지 한국기록이 발전되고 성장해온 과정들을 경기기록사 방법을 적용하여 살펴보았다. 100m 허들의 첫 한국기록은 1969년 전국체육대회에서 금향순(경북) 선수가 수립한 16초2였다. 1년 후, 정옥주(동래여고) 선수가 0.1초 단축시켰고 1971년 박관수(기전여고) 선수가 15초6을 기록하면서 15초대에 진입하였다. 1973년, 우선숙(경남여고) 선수가 아시아선수권에서 14초5로 한국 신기록을 수립하며, 100m 허들 종목은 14초대에 진입까지 빠르게 발전한다. 7년간 기록 정체 후, 1980년부터 전옥금(전북체고, 삼성전자) 선수가 6년간 5회의 한국 신기록을 수립하였고 100분의 1 전자 측정이 도입한 이후, 1982년에는 14초67, 1985년에는 14초53까지 한국기록을 단축시켰다. 1988년, 방신혜(경북대) 선수가 13초80을 기록하며, 100m 허들은 13초대에 진입하게 된다. 2000년에 들어서면서 이연경 선수는 13초47(2004년)의 한국기록을 시작으로 2010년까지 13초00까지 단축시키며, 8회의 한국기록을 수립하게 되는데 2010년 광저우 아시안게임에서 우승하며, 한국 100m 허들을 아시아 정상에 올려놓는다. 8년 뒤, 2018년 자카르타-팔렘방 아시안게임에서 정혜림 선수가 우승을 차지하며, 한국 100m 허들 종목은 아시아의 강자로 자리 잡게 된다. The purpose of this study, it was reviewed that the process in which Korean record was developed and changed from 1960, when Korean record was set for the first time in the 100m hurdle of the Korea Track and Field, to 2019. The first Korean record of 100m hurdle was 16.2 second set by Hyangsoon Keum (Gyeongbuk) at Korean National Sports Festival in 1976. A year later, Ok-joo Jeong (Dongnae Girl's High School) shortened 0.1 seconds, Kwan-su Park of Kijun Girls High School entered into the 15 seconds with 15.6 seconds, and women’s hurdle was developed quickly and reached the 14 seconds as Sun-sook Woo (Gyeongnam Girls’ High School) established 14.5 seconds. After stagnant record for seven years, Ok-keum Jeon (Jeonbuk Physical High School, Samsung Electronics) established Korean records 5 times for 6 years from 1980, made the record of 14.67 seconds in 1882 when it was introduced 1/100 electronic measurement, and shortened it to 14.53 seconds in 1985. Korea women’s hurdle entered into 13 seconds as Sin-hye Bank (Kyungpook National University) shortened to 13.80 seconds in National Track and Field Championship in 1988. Since 2000, Yeon-kyung Lee made 8 times Korean records as starting 13.47 seconds (2004) and shortening to 13 seconds in 2010. And she won the 2010 Guangzhou Asian Game and put Korean women 100m hurdle on the top of Asia. At the 2018 Jakarta Asian Game, Hye-rim Jeong won a gold medal again after 8 years and kept the pride of Korean 100 hurdle.

Effects of Transcranial Direct Current Stimulation Over Primary Motor Cortex on the Onset Time of Upper Extremity Muscles’ Activities for Forward Reaching Performance : A Preliminary Study

JaeHyuk Lee,BumChul Yoon 대한스포츠물리치료학회 2019 정형스포츠물리치료학회지 Vol.15 No.1

Purpose: This study aimed to investigate the effect of transcranial direct current stimulation (tDCS) on the onset of upper extremity muscle activities during forward reaching performance. Methods: Fifteen healthy men (age, 24.2±1.55y) participated in this randomized double-blind crossover study. Each participant received both a sham and 2-mA stimulation over M1 bilaterally for 20 min, with a minimum washout period of 4 days. Muscle activation was evaluated for all the participants during the task of reaching out for a marked target as fast as possible, using electromyography (EMG) before and immediately after tDCS application. Results: For the within arm-length reaching performance in the 2-mA stimulation session, the muscle activities of the anterior deltoid (AD), posterior deltoid (PD), biceps brachii (BB), and inferior spinatus (IS) were decreased significantly during, immediately after, and 20 min after the tDCS period compared with the baseline values (p for all values <0.05). The pectoralis major (Pec) muscle showed a significant decrease only in the 20-min period after tDCS compared with the baseline values (p=0.001). For the beyond arm-length reaching performance, the 2-mA application on the AD, PD, BB, and IS showed significant decreases in onset time in all the periods after tDCS as compared with the baseline (p for all values <0.05). The onset of the triceps brachii muscle activity significantly decreased immediately and 20 min after the tDCS periods. For the Pec muscle, the onset time of muscle activation significantly changed only in the 20 min after the tDCS period compared with the baseline values. Conclusion: The present study demonstrated that bilateral tDCS over M1 facilitates muscle activation rapidly during the reaching performance, regardless of the reaching target distance.

Rehabilitation Strategies in Lifestyle Intervention for Improving the Physical Function of the Knee

Jongmin Lim,Bumchul Yoon 대한스포츠물리치료학회 2018 정형스포츠물리치료학회지 Vol.14 No.2

Purpose: Lifestyle intervention (LSI) provides basic recommendations that improve the quality of life and health of patients with minor disabilities. The LSI intervention strategies are associated with active living, healthy weight, healthy eating, and emotional stability. These intervention strategies can change an unhealthy lifestyle to a healthy lifestyle and provide important health care information. Main issue: This study focused on a new LSI-based knee rehabilitation protocol and proved the effect of exercise prescription on the knee. The clinical significance of this study demonstrated that continuous rehabilitation, effective rehabilitation, and recurrence prevention can be achieved by prescribing the appropriate exercise for patients after discharge. Therefore, practical lifestyle medicine knowledge and information are provided by the home-based rehabilitation self-exercise program with the new LSI-based knee rehabilitation protocol. Conclusions: The LSI-based protocol can improve and maintain health conditions and knee function. With the aim of improving self-care abilities, this program is expected to make significant contributions recurrence prevention, reduced mortality, and improved quality of life, physical function, and fitness.

The Onset Time of Neck and Shoulder Muscles Activation During Shoulder Elevation in Older and Young Adults

TaeYeong Kim,Minhee Kim,BumChul Yoon 대한스포츠물리치료학회 2017 정형스포츠물리치료학회지 Vol.13 No.1

This study examined differences in the time to onset of neck and shoulder muscle activation during arm elevation in older and younger adults. Eleven older and 10 younger adults were recruited. Data from neck and shoulder muscles were recorded as a subject elevated one arm. The mean time to onset of muscle activation was compared using an independent t-test. Older adults demonstrated significantly later onset of contraction of the ipsilateral sternocleidomastoid during shoulder flexion (p = 0.046), as well as significantly later contraction of the middle deltoid (p = 0.005), posterior deltoid (p = 0.027), contralateral splenius capitis (p = 0.008), upper trapezius (p = 0.020), middle trapezius (p = 0.012), lower trapezius (p = 0.012), and infraspinatus (p = 0.001) during shoulder abduction. These findings indicate that older adults use different neuromuscular strategies than younger adults during arm elevation. These changes could result from age-related decline in the neuromuscular system. The findings could be used to identify contributors to neck and shoulder discomfort or dysfunctionin older adults.

[글로벌프로젝트] 필리핀 남북철도 제1공구 프로젝트(공기단축, 시공성 개선 및 원가절감에 대한 성공적인 현장 사례)

권정대(Jeongdae Kwon),김범철(Bumchul Kim),박종철(Jongcheul Park) 대한토목학회 2024 대한토목학회지 Vol.72 No.4

오픈스택 텔레메터링 구조 분석과 개선점

백동명(Dongmyoung Baek),이범철(Bumchul Lee) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.11

The Effect of Multi-channel FES Stimulation Gait Training based on Muscle Synergy Analysis on Gait Performance in Stroke Patients : A Case Study

TaeHyun Lim,JungHwan Lim,BumChul Yoon 대한스포츠물리치료학회 2019 정형스포츠물리치료학회지 Vol.15 No.2

Purpose: Foot drop is a common symptom in disorders of the central nervous system (CNS : Central Nervous System), such as stroke. The combination of functional electrical stimulation (FES : Functional Electronical Stimulation) and gait rehabilitation is an effective intervention for stroke gait rehabilitation. Therefore, the aim of this study was to determine the effectiveness of FES training based on the muscle synergy pattern of stroke patients during gait. Methods: The intervention was tested on two chronic stroke patients. They underwent a 6-week intervention consisting of 30 min sessions of FES-supported gait three times per week. Muscle synergies were extracted from electromyography (EMG : electromyography) signals using a non-negative matrix factorization algorithm (NMF : Non-negative Matrix Factorization). Results: The optimal number of synergies has been defined as the minimum number needed to obtain variability accounted for (VAF) ⩾90%. Before treatment, both patients presented only three merged muscle synergies during gait, resembling two different gait abnormalities. After the 6-week intervention, the number of extracted synergies became four and they increased their gait speed with the physiological muscle synergies. The 10m walking test (10MWT : 10Meter Walking Test) used in the first and last days of intervention increased from 16.11 to 14.56 m/s, and from 19.76 to 15.37m/s for Subject 1 and Subject 2, respectively. Conclusion: Multi-channel FES walking intervention based on synergy analysis influenced the number of muscle synergies during the gait of stroke patients. This intervention has an effective effect on improving the gait performance of stroke patients.

토끼의 경골골절 후 치유 촉진을 위한 전기자극 치료의 효과

이재학(JaeHac Lee),윤범철(BumChul Yoon) 고려대학교 보건과학연구소 2007 보건과학논집 Vol.33 No.1

  Electrotherapy is one of the most important modality of Physical Therapy. Many therapists have been using electrotherapy to treat musculoskeletal diseases. Since 1950"s, researchers have been experimenting about effects of electrical stimulation to facilitate the healing of fractured bones. Taking into account that MES also increases blood flow in the muscle tissue and that blood flow has a close relationship to the fracture healing, it is likely that the use of MES may result in an improvement in the healing of fractured bones. We performed studies, to confirm the effects of electrical stimulation which is applied to rabbit"s fractured tibial bone. The object of the present study was to evaluate the effect of electrical stimulation on fracture healing, using rabbits model. 10 rabbits(3.9~4.5 ㎏) were used and divided into two groups, one group was treated by electrical stimulation and the other group was not given any treatment.<BR>  All rabbits received unilateral, transvers, mid-tibial, 3㎜ gapped osteotomics that were stabilized with double bar external fixator and splinter. Electrical stimulation was applied 1 hour per day for 2 weeks. We used the needle electrodes to stimulate the muscles selectively. Used electrical stimulator was Free Q. We employed X-ray to confirm the callus formation and used CT to verify bone mineral density at cross section of fractured areas of the bone. Fracture healing was not significantly increased in the experimental group on the radiological studies(p> .05). respectively, higher in the study group compared to the control group.<BR>  This result of the present study demonstrated that use of MES can enhance callus development and mineralization, with the consequent improvement of the healing bone.