K-Pop 댄스 하지동작의 생체역학적 남녀 차이 분석

장영관,홍수연,기재석,장인영,Jang, Young-Kwan,Hong, Su-Yeon,Ki, Jae-sug,Jang, In-Young 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.1

The purpose of this study was to investigate the biomechanical of K-Pop dance movement. The study was conducted on 15 male and 15 female subjects in 20-30 age groups. And they choose 150 K-Pop dance choreographies in the top 10 ranking of the main charts. We analyzed the RoM, joint moment and impulse force of the highlight movements. First, During the K-Pop dance motion, the usage of knee joints are more than the hip joints and the ankle joints, and female dancers has a larger range of motion than the male dancers. Second, male dancer uses more than female dancers when they compared the load of male dancers and female dancers. In particular, flexion and extension of the hip joints are mostly used in this study. Third, the impulse force of male dancers was greater than of female dancers, but it was statistically insignificant, this is equal to the impulse on walking. In conclusion, Female dancers use more range of motion than male dancers, but male dancer choreography requires greater torque, which can strain joints. Most choreographic exercises involve movements such as hip joint, knee joint, flexion of ankle joint, extension, rotation, and jumping.

관계형 데이터베이스에서 응답시간에 제약이 있는 경우 최적 역정규화 방법

장영관(Jang Young Kwan) 한국산업경영시스템학회 2002 한국산업경영시스템학회 학술대회 Vol.2002 No.추계

Databases are central to business information systems and RDBMS is most widely used for the database system. Normalization was designed to control various anomalies (insert, update, delete anomalies). However, normalized database design does not account for the tradeoffs necessary for performance. In this research, we model a database design method considering denormalization of duplicating attributes in order to reduce frequent join processes. This model considers response time for processing each select, insert, update, delete transaction, and for treating anomalies. A branch and bound method is proposed for this model.

관계형 데이터베이스에서 응답시간에 제약이 있는 경우 최적 역정규화 방법

장영관(Young-Kwan Jang) 한국산업경영시스템학회 2003 한국산업경영시스템학회지 Vol.26 No.3

Databases are central to business information systems and RDBMS is most widely used for the database system. Normalization was designed to control various anomalies (insert, update, delete anomalies). However, normalized database design does not account for the tradeoffs necessary for performance. In this research, I model a database design method considering denormalization of duplicating attributes in order to reduce frequent join processes. This model considers response time for processing each select, insert, update, delete transaction, and for treating anomalies. A branch and bound method is proposed for this model.

관계형 데이터베이스에서 비정규화를 사용한 데이터베이스 설계

장영관(Jang, Young Kwan),강맹규(Kang, Maing Kyu) 대한산업공학회 1996 대한산업공학회 춘계학술대회논문집 Vol.1996 No.4

디지털 중량제어기술을 활용한 고령친화운동기구의 인간공학적 분석

김보건(Bo-Kun Kim),장영관(Young-Kwan Jang),하종규(Chong-Ku Hah),백준영(Jun-Young Baek) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.3

노쇠의 관리를 위해 근력운동의 중요성이 강조되고 있고 다양한 운동기구들이 개발되어지고 있다. 최근에는 전자기 저항을 디지털 중량으로 변환하여 제어하는 디지털 중량제어기술이 주목을 받고 있으나 국내에서 고령자를 대상으로 하여 디지털 중량제어기술 기반 운동기구의 효과성과 안전성을 검증한 보고는 전무하다, 따라서, 본 연구는 디지털 중량제어기술을 활용한 고령친화운동기구의 인간공학적 분석을 통하여 이후 개발방향의 지표 제시를 목적으로 하였다. 총20명의 성인 남녀 (연령: 62.40 ± 2.09 세) 를 대상으로 적용 가능한 운동강도를 분류하기 위하여 운동기구의 부하를 레벨화하였고, 세가지 실험대상 동작시의 근 활성도와 심박수를 측정하였다. 또한, 국제 표준 ISO 9241-11에 준거한 설문지를 활용하여 소프트웨어부와 기기부의 안정성, 조작성, 효율성, 만족도 등을 평가하였다. 그 결과, 운동 부하, 근활성도, 심박수가 일관되게 증가하는 결과를 통해서 현장에서 적용 가능한 3단계의 운동 강도를 분류할 수 있었다. 모니터 사이즈의 확대, 메뉴의 한글화, 기구의 소형화, 소음의 최소화가 필요한 것으로 나타났다. 이러한, 결과들을 고려할 때 향후 신제품 개발시에는 기구 크기, 표시부, 소음의 보완을 통한 고도화된 고령친화운동기구 개발의 필요성이 시사되어 진다. For frailty management, the importance of resistance exercise has been emphasized, and various devices have been developed. Recently, digital weight control technology that converts electromagnetic resistance to a digital weight is attracting attention, but there are no reports confirming the effectiveness and safety of the device for seniors in Korea. This study conducted a biomechanic-based ergonomic analysis of an elderly-friendly exercise device utilized in digital load control technology to suggest a direction for development. Twenty seniors (age: 62.40 ± 2.09 years) were included. The load of the device was classified into three levels, and the muscle activity and heart rate were assessed during three experimental motions. A questionnaire based on the International Organization for Standardization 9241-11 was adopted to evaluate the stability, operationality, efficiency, and satisfaction with the software and device. The program could be divided into three exercise intensities that can be utilized in the field depending on whether the exercise load, muscle activity, and heart rate were consistent. The monitor size needed to be enlarged to make the menu Korean, reduce the device size, and minimize noise. Considering these findings, the development of an advanced age-friendly exercise device by improving the size, display, and noise is suggested.

임신 기간에 따른 임산부 보행의 운동학적 요인과 하지 관절모멘트 패턴 비교

하종규(Chong-Ku Hah),장영관(Young-Kwan Jang) 한국산업경영시스템학회 2009 한국산업경영시스템학회지 Vol.32 No.3

The purpose of this study was to compare gait patterns during pregnancy. Because of the changes in hormone levels and anatomical changes such as body mass, body-mass distribution, joint laxity, and musculotendinous strength that result from pregnancy, it was possible that there would be certain gait deviations associated with these changes. Three-dimensional gait analyses were performed from a self-selected pace, and six subjects(height : 163 ± 3.80kg, 65.3 ± 5.14kg, 70.2 ± 4.98kg) participated in the three times(the early, middle and last years). 7 cameras(Proreflex MCU-240, Qualisys) and 2 force plates (Type 9286AA, Kistler) were used to acquire raw data. The parameters were calculated and analyzed with Visual-3D and joint moments computed using inverse dynamics. In conclusion, pregnant women's gait patterns were changed during pregnancy period because pregnancy makes them physical changes. The main changes were joint moments and kinematic factors during pregnancy period. The pregnancy transformed normal gait pattern into toe out position. Therefore, exercise programs to improve muscle activity were necessary where joint moments were small. The development of simulator should be studied for pregnant women's tailored shoes and accessories in future.

보아의 K-Pop 넘버원 댄스 핵심동작의 생체역학적 분석

하종규(Hah, Chong-Ku),장영관(Jang, Young-Kwan),기재석(Ki, Jae-Sug) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.2

본 연구의 목적은 보아의 넘버원 댄스 핵심동작의 생체역학적 3차원분석이며 보아의 전문 안무가가 실험에 참가하였 다. 핵심동작의 관절 동작범위는 견관절과 주관절의 전후회전, 분절 동작범위는 몸통과 골반의 좌우회전이 가장 크며 몸통이 골반보다 더 크다. 무게중심이동 속도는 상하방향이 가장 빠르고 좌우, 전후방향 순이다. 최대각속도는 상지관절의 견관절과 주관절 및 하지관절의 고관절과 슬관절의 전후회전에서 가장 크게 나타났으나 족관절의 동작범위와 각속도는 거의 생성되지 않았다. 그리고 최대 회전파워는 상지 견관절과 하지 슬관절을 중심으로 원위분절로 갈수록 작게 나타나고 회전력은 고관절 외전모멘트가 가장 크고 슬관절은 신전모멘트가 크게 나타났다. The purpose of this study was to investigate biomechanical factors on key motions in K-Pop dance(BoA’s No.1). A professional choreographer who was BoA’s K-Pop No. 1 dance participated in this study. ROMs(range of motion) of shoulder and elbow joints in AP direction were greater than other joints. Those of trunk and pelvis in ML direction were the greatest of other directions. The velocity of CoG in SI direction was greater than other directions, and also max angular velocities of shoulder, elbow, knee, and hip joints in AP direction were the greatest of all directions. But ROM and angular velocity of ankle joint were very small. Max rotational powers of shoulder and knee joints were larger than other joints.

전신진동운동이 드랍랜딩점프 동작에 미치는 영향

홍수연(Su-Yeon Hong),장영관(Young-Kwan Jang),김진현(Jin-Hyun Kim) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.3

연구목적 본 연구의 목적은 전신진동운동(whole body vibration exercise)이 드랍랜딩점프(drop landing jump) 동작에 미치는 영향을 규명하는 것으로 진동운동그룹(n=5, VEG, Vibration Exercise Group)과 단순운동그룹(n=5, OEG, Only Exercise Group)을 4주 동안 트레이닝 시킨 후 운동 전과 운동 4주 후 변화를 비교 분석하였다. 실험방법 3차원 영상 데이터는 10개의 적외선카메라(Vicon, UK)를 샘플링 율, 100 Hz.를 사용하여 획득하였으며, 하지 관절의 파워는 2대의 지면반력기(AMTI, USA)를 샘플링 율 1000Hz.로 데이터를 획득 하였다. 연구결과 첫째, 무게중심의 변동성은 하강국면에서 가장 크게 나타나 점프 후 착지 시 상해위험성이 큰 것으로 나타났다. 둘째, 진동운동그룹은 훈련기간에 관계없이 단순운동그룹보다 점프높이가 증가하였다. 셋째, 운동그룹간의 관절파워가 4주 훈련 후 엉덩관절 P1(굴곡)과 무릎관절 P2(신전)에서 통계적으로 유의한 차이를 보였으나, 훈련기간에 따른 하지의 관절파워는 모든 국면과 운동그룹에 관계없이 통계적으로 유의한 차이를 보이지 않았다. 결론 훈련기간에 관계없이 진동과 운동을 병행한 진동운동그룹이 운동만을 수행한 단순운동그룹보다 점프높이에 증가를 가져왔으나 점프높이와 하지의 관절 파워와의 일관성 규명할 수 없었다. Objective: This study was conducted to investigate the effects of WBVE on biomechanical factor analysis of drop landing jumps before and after a four week training program. Methods: Participants were divided into two group: VEG (n=5, age: 25.7±2.3 yrs, height: 170±7.6 cm, weight: 69.3±8.3 kg) and OEG (n=5, age: 24.6±3.4 yrs, height: 164±4.9 cm, weight: 58.8±9.2 kg). Ten infrared cameras (Vicon, UK) with a sampling rate of 100 Hz were used in two GRF measurement systems (AMTI, USA). Results: The variability of the center of mass was largest at the falling phase, and there was a great risk of injury when landing after the jump. Second, the jumping heights of the VEG (vibration exercise group) were higher than those of the OEG (only exercise group), regardless of training period. Third, there were significant differences in the hip joint P1 (flexion) and knee joint P2 (extension) between the exercise groups after 4 weeks of training. However, there were no significant differences among training periods or phases. Conclusion: regardless of training periods, the VEG showed increased jump height compared with the OEG, but the consistency between the jump height and the lower joint power could not be determined.

페달 작동 시스템 유형이 운전자 자세에 미치는 영향

오형술(Hyung Sool Oh),장영관(Young-Kwan Jang),하종규(Chong-Ku, Hah),이재훈(Jae-Hoon, Yi) 한국산업경영시스템학회 2010 한국산업경영시스템학회 학술대회 Vol.3 No.-

The purpose of this study was to compare pedaling patterns according to pedal types during driving. Three-dimensional gait analyses were performed from a self-selected pace, and fourteen subjects participated in the three times(the early, middle and last years). Six cameras (Proreflex MCU-240, Qualisys) were used to acquire raw data. The parameters were calculated and analyzed with Visual-3D. In conclusion, most joint - ROM of lower limbs were less than two-foot pedal system. It is necessary that the current pedal system is to be improved.

후진 보법을 이용한 전방향 보행의 생체역학적 연구

하종규(Hah, Chong-Ku),정왕수(Jeong, Wang-Soo),홍수연(Hong, Su-Yeon),장영관(Jang, Young-Kwan),기재석(Ki, Jae-Sug) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.11

본 연구의 목적은 생체역학적 변인을 근거로 하여 후진보법의 전방향 보행(댄스보행)이 후방보행처럼 재활과 걷기운동으로써 가능성을 규명하는 것이다. 실행대상자는 13명의 여성댄스 전문가로 자료수집을 위하여 12대의 적외선카메라와 2대의 지면반력기가 동조되어 사용되었다. 연구결과에 따르면 댄스보행의 보속, 활보장과 양 하지지지기시간은 후방보행보다 크고, 활보폭은 작았으며 관절각범위, 관절모멘트와 관절파워의 최대치 출현 빈도에서 댄스보행이 후방보행보다 더 많았다. 이러한 결과들은 댄스보행이 재활과 걷기 운동에 후방보행에 버금가는 훌륭한 도구임을 판단하는데 충분하다. The purpose of this study was to inverstigate possibility of a forward gait with backward meehanism(dance gait) as rehabilitation and/or walking exercise by means of biomeehanical variables. Thirteen professional women dancers(age, 21,1±1.3 yrs; height, 159.3±7.2 cm; body mass, 45.1±8.4 kg)participated in this study. We found that speed, stride length and double limb support time of a dance gait were more greater than backward gait, but stride width of dance gait less than a backward gait. Maximum RoMs, moments and powers of the lower limb joints on a dance gait were more frequent than a backward dance. These results were judged to be sufficient by the possivility of dance gait as rehabilitatiob and walking exercise