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공세진,박종현 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.6
Five bacteriophages were isolated from kimchiwith the hosts of two Weissella cibaria and acid-producingbacteria, and characterized for understanding Weissellaphage. By transmission electron microscope, aWC51 andaWC52 belonged to the Myoviridae and aWC005,aWC130, and aWC248 belonged to the Podoviridae. Onestepgrowth curves showed that latent periods of bacteriophagesranged from 70 to 90 min and burst sizes rangedfrom 7 to 195 particles/cell. aWC51 and aWC005 werethermally resistant than the others and those D values were71 and 34 s at 70 C. pH stability test at pH 2.0–4.0showed aWC005 was most stable and the others were alsostable at low pH of 3.0. Interestingly, the phages showedtwo types of morphology and had a high tolerance underacidic condition, therefore, which might cause mortality tothe Weissella after middle stage of kimchi fermentation.
공세진,엄광문,김철승,박관용 대한전기학회 2006 전기학회논문지 D Vol.55 No.5(D)
- The purpose of this study is to develop a portable gait-event detection system which is necessary for the cycle-to-cycle FES(functional electrical stimulation) control of locomotion. To make the system portable, we made following modifications in the gait signal measurement system. That is, 1) to make the system wireless using Bluetooth communication, 2) to make the system small-sized and battery-powered by using low power consumption μP(ATmega8535L). The gait-events were analyzed in off-line at the main computer using ANN(Artificial Neural Network). The Proposed system showed no mis-detection of the gait-events of normal subject and hemiplegia subjects. The performance of the system was better than the previous wired-system.
펜싱 런지 동작에서 주동다리와 비 주동다리의 운동역학적 특성
공세진 ( Se Jin Kong ) 한국스포츠정책과학원(구 한국스포츠개발원) 2014 체육과학연구 Vol.25 No.3
본 연구의 목적은 스포츠 영역에서 순간적인 신체의 이동 방법으로 많이 활용되는 런지 동작의 수행력에 미치는 요인을 근전도 분석이 포함된 운동역학적 분석을 통하여 규명하는 것이다. 숙련된 14명의 펜싱 선수를 대상으로 피험자가 제자리에서 최대한 멀리 나아갈 수 있는 킥 런지를 수행하게 하고 이를 3차원 동작분석기와 근전도 시스템을 적용하여 분석하였다. 킥 런지의 사전 동작이 포함된 동작과 그렇지 않은 동작을 구분하였고 이를 주동다리와 비 주동다리에서 모두 실시하였다. 이 연구의 결론은 다음과 같다. 사전 동작이 포함된 런지에서 보다 높은 수행력을 보였다. 또한 숙련도가 높아질수록 런지의 길이가 길어지는데 여기서 오는 충격량을 제어하기 위한 기전으로 운동 수행 시간을 단축하는 전략적 기전이 사용 되는 것으로 보인다. 이와 더불어 주동다리의 동작에서 모멘트와 파워 등의 역학적 변인의 차이가 나타났는데 이는 근육을 동원하는 유기적 능력의 차이에서 기인하는 것으로 보인다. The purpose of this research is to investigate the factors affecting the performance capability of lunge movements by performing lunge movements which are commonly used as a method of instant physical movement in sports with a kinetic analysis including an EMG analysis. This research targeted 14 skilled fencers and made the subjects perform kick-lunges which allow them to go farthest from their positions and performed an analysis on such, applying a 3D motion analysis system and an EMG system. The subjects performed kick-lunges in two movements; one with a preliminary movement and the other without it and those are performed with both dominant leg and non-dominant leg. The result of this research is as follows. The lunges with a preliminary movement showed higher performance capability than those without it. Furthermore, as the level of skills gets higher, the length of lunges gets longer, and it seemed that a tactical mechanism shortening exercise performance times was used as a mechanism to control the impulse coming from such lengthened lunges. In addition, a difference appeared in mechanical factors such as moment and power in a dominant leg movement and it seemed to result from a difference in an functional capability using muscles.
〈속보논문〉 가속도계를 이용한 마비환자의 보행이벤트 검출
孔世鎭(Se-Jin KONG),金哲承(Chul-Seung KIM),文基旭(Ki-Wook MOON),嚴光文(Gwang-Moon EOM),卓?來(Gye-Rae TACK),金敬燮(Kyeong-Seop KIM),李定桓(Jeong-Whan LEE),李永熙(Young-Hee LEE) 대한전기학회 2007 전기학회논문지 Vol.56 No.5
The purpose of this study is to develop a practical gait-event detection system which is necessary for the FES (functional electrical stimulation) control of locomotion in paralyzed patients. The system is comprised of a sensor board and an event recognition algorithm. We focused on the practicality improvement of the system through 1) using accelerometer to get the angle of shank and dispensing with the foot-switches having limitation in indoor or barefoot usage and 2) using a rule-base instead of threshold to determine the heel-off/heel-strike events corresponding the stimulation on/off timing. The sensor signals are transmitted through RF communication and gait-events was detected using the peaks in shank angle. The system could detect two critical gait-events in all five paralyzed patients. The standard deviation of the gait events time from the peaks were smaller when 1.5㎐ cutoff frequency was used in the derivation of the shank angle from the acceleration signals.
孔世鎭(Se-Jin Kong),嚴光文(Gwang-Moon Eom),金哲承(Chul-Seung Kim),朴寬龍(Kwan-Yong Park) 대한전기학회 2006 전기학회논문지 D Vol.55 No.5
The purpose of this study is to develop a portable gait-event detection system which is necessary for the cycle-to-cycle FES(functional electrical stimulation) control of locomotion. To make the system portable, we made following modifications in the gait signal measurement system. That is, 1) to make the system wireless using Bluetooth communication, 2) to make the system small-sized and battery-powered by using low power consumption μP(ATmega8535L). The gait-events were analyzed in off-line at the main computer using ANN(Artificial Neural Network). The Proposed system showed no mis-detection of the gait-events of normal subject and hemiplegia subjects. The performance of the system was better than the previous wired-system.
워킹화 기능 개선을 위한 보행 속도에 따른 중년 여성의 하지 동작 특성 연구
공세진 ( Se-jin Kong ),이정호 ( Jung-ho Lee ),임규찬 ( Kyu-chan Lim ),김진현 ( Jin-hyun Kim ) 한국스포츠정책과학원(구 한국스포츠개발원) 2016 체육과학연구 Vol.27 No.2
본 연구의 목적은 중년 여성의 보행 속도에 따른 하지 동작의 특성을 밝히고 보행 안정성 향상을 위한 워킹화의 기능 개선 요소를 제안하는 것이다. 건강한 중년여성 30명을 대상으로 자기가 선호하는 속도와 선호 속도에 20% 빠른 속도의 보행을 수행하도록 하였다. 3차원 동작 측정시스템과 족저 압력 측정 시스템을 이용하여 동작 특성을 계측하였다. 선호 속도와 빠른 속도의 동작 차이 분석을 위하여 종속표본 t-검증을 수행하였다. 이 때, 유의수준은 α=.05로 설정하였다. 빠른 걸음의 보행이 선호 속도의 보행보다 발의 지면 접지각이 컷고, 동작 안정성이 낮았다. 또한 빠른 보행에서 큰 족저압력이 계측 되었으며 특히 엄지발가락의 압력이 높았다. 빠른 보행에서의 신체 안정성과 발의 압력 분산을 위한 신발의 기능 개선이 필요할 것으로 판단된다. The objective of this study was to reveal the characteristics of lower extremity motions of middle-aged women in accordance with their walking speed, and also to suggest elements of improving functions of walking-shoe for the improvement of gait stability. Total 30 healthy middle-aged women were asked to walk in their preferred speed and also speed 20% faster than that. Using the 3D motion capture system and the plantar pressure measuring system, the characteristics of lower extremity motions were measured. For the analysis on differences in motions between preferred and faster speeds, the paired t-test was performed. At this time, the significance level was set up as α=.05. The walking in faster speed showed the greater ground contact angle than walking in preferred speed while its gait stability was low. Also, the faster walking showed the bigger plantar pressure, and especially, the pressure on the great toe was high. It would be necessary to improve functions of shoes for the gait stability and dispersion of pressure on feet while fast walking.