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Effects of Vertical Alignment of Leg on the Knee Trajectory and Pedal Force during Pedaling
Kim, Daehyeok,Seo, Jeongwoo,Yang, Seungtae,Kang, DongWon,Choi, Jinseung,Kim, Jinhyun,Tack, Gyerae Korean Society of Sport Biomechanics 2016 한국운동역학회지 Vol.26 No.3
Objective: This study evaluated the vertical and horizontal forces in the frontal plane acting on a pedal due to the vertical alignment of the lower limbs. Method: Seven male subjects (age: $25.3{\pm} 0.8years$, height: $175.4{\pm}4.7cm$, weight: $74.7{\pm}14.2kg$, foot size: $262.9{\pm}7.6mm$) participated in two 2-minute cycle pedaling tests, with the same load and cadence (60 revolutions per minute) across all subjects. The subject's saddle height was determined by the height when the knee was at $25^{\circ}$ flexion when the pedal crank was at the 6 o'clock position (knee angle method). The horizontal force acting on the pedal, vertical force acting on the pedal in the frontal plane, ratio of the two forces, and knee range of motion in the frontal plane were calculated for four pedaling phases (phase 1: $330{\sim}30^{\circ}$, phase 2: $30{\sim}150^{\circ}$, phase 3: $150{\sim}210^{\circ}$, phase 4: $210{\sim}330^{\circ}$) and the complete pedaling cycle. Results: The range of motion of the knee in the frontal plane was decreased, and the ratio of vertical force to horizontal force and overall pedal force in the complete cycle were increased after vertical alignment. Conclusion: The ratio of vertical force to horizontal force in the frontal plane may be used as an injury prevention index of the lower limb.
Effects of Vertical Alignment of Leg on the Knee Trajectory and Pedal Force during Pedaling
( Daehyeok Kim ),( Jeongwoo Seo ),( Seungtae Yang ),( Dongwon Kang ),( Jinseung Choi ),( Jinhyun Kim ),( Gyerae Tack ) 한국운동역학회 2016 한국운동역학회지 Vol.26 No.3
Objective: This study evaluated the vertical and horizontal forces in the frontal plane acting on a pedal due to the vertical alignment of the lower limbs. Method: Seven male subjects (age: 25.3 ± 0.8 years, height: 175.4 ± 4.7 cm, weight: 74.7 ± 14.2 kg, foot size: 262.9 ± 7.6 mm) participated in two 2-minute cycle pedaling tests, with the same load and cadence (60 revolutions per minute) across all subjects. The subject``s saddle height was determined by the height when the knee was at 25° flexion when the pedal crank was at the 6 o``clock position (knee angle method). The horizontal force acting on the pedal, vertical force acting on the pedal in the frontal plane, ratio of the two forces, and knee range of motion in the frontal plane were calculated for four pedaling phases (phase 1: 330~30°, phase 2: 30~150°, phase 3: 150~210°, phase 4: 210~330°) and the complete pedaling cycle. Results: The range of motion of the knee in the frontal plane was decreased, and the ratio of vertical force to horizontal force and overall pedal force in the complete cycle were increased after vertical alignment. Conclusion: The ratio of vertical force to horizontal force in the frontal plane may be used as an injury prevention index of the lower limb.
Sung Won Choi,Da-jung Park,Jinseung Kim,Tae-jin Park,Jun-su Kim,Sunghun Byun,Young-seok Lee,Jung-hoon Kim 대한가정의학회 2016 Korean Journal of Family Medicine Vol.37 No.1
Background: An increase in the obese adolescent population is being recognized as a serious medical and social problem. The present study aimed to examine the association between neighborhood socioeconomic status (SES) and obesity in Korean adolescents based on total available resources and local social inequality models. Methods: The present study used data from the 2013 Korea Youth Risk Behavior Web-based Survey in analyzing 72,438 Korean adolescents aged 12–18. The analysis investigated obesity odds ratio (OR) according to neighborhood SES adjusted for age and individual SES indices, which included family affluence scale (FAS), education level of parents, cohabitation with parents, and weekly allowance. Obesity OR was investigated according to neighborhood SES by FAS, and according to FAS by neighborhood SES. Results: After adjusting for age and individual SES variables, there was no significant association between neighborhood SES and adolescent obesity for either boys or girls. However, girls in the high FAS group showed a pattern of lower neighborhood SES being associated with a significant increase in risk of obesity; in the high neighborhood SES group, boys showed a pattern of higher FAS being associated with a significant increase in risk of obesity, whereas girls show a pattern of decrease. Conclusion: Although limited, the present study demonstrated that some girl groups exhibited a pattern of lower neighborhood SES being associated with an increase in risk of obesity, as well as a gender-based difference in risk of obesity by individual SES. Therefore, measures to prevent adolescent obesity should be established with consideration for differences in risk according to individual and neighborhood SES.
Design of System Architecture for Data Intensive Science Data Center as NSDC
Jinseung Yu,Christophe Bonnaud,Heejun Yoon,Beobkyun Kim 한국콘텐츠학회 2009 ICCC International Digital Design Invitation Exhib Vol.2009 No.12
Modern basic science research is moving to data intensive research based on data intensive computing using large-scale, large-volume data created in big data creation equipment such as particle collider, digital observatory, genome analyzer. For the support of this research trend, data intensive science data center is required cyber infrastructure to store, analyze, simulate big science data, is composted of Information Technologies, and this data centers are globally inter-related. KISTI NSDC (Data Intensive Science Data Center) has been building and operating the beginning level data intensive data center for the basic scientist who research in data intensive science. So, this paper introduce to fundamental system architecture framework design and implementation of data intensive data center focusing on environment of supporting for store, analysis and permanent archiving of large volume data.