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박형기,오동환 한국축산학회 1984 한국축산학회지 Vol.26 No.5
A study was conducted to determine the effects on a mixture of ascorbic acid and α-tocopherol in the pH, color and residul nitrite of the cured meat. The results obtained were summarized as follows; The pH value was shown a little low trend according to the increase of ascorbic acid and α-tocopherol during the period of curing meat, but it was not to be markedly different. According to the increase of the amounts of ascorbic acid and α-tocopherol the color development of the cured meat was improved, and the residual nitrite of the cured meat was decreased. As the results obtained through this experiment the addition of ascorbic acid and α-tocopherol would be more desirble than 500ppm in each.
위등세모근 통증 유무와 머리자세가 어깨면 위팔벌림 시 어깨뼈 위돌림근 활성도에 미치는 영향
박형기,한경주 한국신경근육물리치료학회(구 한국신경근육재활학회) 2017 한국신경근육재활학회지 Vol.7 No.1
This study evaluated the effects of upper trapezius pain (UTP) and head positions on scapuar upwrad rotators’ activities during shoulder abduction on the scapular plane. The study participants included 10 subjects with and without UTP respectively. In forward and neutral head positions, the muscle activity of the upper trapezius (UT), low trapezius (LT), and serratus anterior (SA) was measured during shoulder elevation on the scapular plane. The EMG signals was normalized through maximal voluntary isometric contraction. The muscles’ activities between the two positions was compared using a paired t-test. The UT and SA activities were significantly greater in the group with UTP than the group without UTP (p<0.05). In addition, the UT and SA activities were significantly different between forward and neutral head positions (p<0.05). However, no significant difference in LT activity between with and without UTP, and between the postures was found (p>0.05). These results indicate that the UTP and head position may have may influence on the activities of the UT and SA during should elevation on scapular plane.
현수교 PWS 및 CFRC 행어로프의 내풍안정성 실험 평가
박형기,강선진,Park, Hyung-Ghee,Kang, Seon-Jin 한국방재학회 2008 한국방재학회논문집 Vol.8 No.6
In this study, to evaluate the aerodynamic stability of suspension bridge hanger ropes, the wind tunnel tests are carried out. It is found that the vortex induced vibration is detected only in single PE-coated PWS cable case. And the wake galloping is occurred in twin cables spaced $3\sim6$ cable diameters of cable center to center when the incidence angle of wind is only zero degree. In case of other incidence angles of wind except zero degree, the wake galloping or the wake flutter are showed in twin cables even outside range of the bounds of $3\sim6$ cable diameters. CFRC cable shows very stable for the twin cables regardless of the distance between two cables, and also for various incidence angles of wind. Thus the characteristic of CFRC rope overwhelms one of PWS cable in aerodynamic stability. 이 연구에서는 현수교 PWS 및 CFRC 행어로프의 바람에 의한 내풍안정성 평가을 위한 풍동실험을 수행하였다. 풍동실험결과, PE관으로 피복된 PWS 케이블은 단일 케이블에서 와류진동이 발생하고 복수 케이블에서는 중심간격이 $3\sim6D$일때 웨이크갤로핑이 발생하였다. 진동이 발생하지 않는 복수 케이블에서도 풍향각이 달라지면 웨이크갤로핑이나 웨이크플러터가 발생함을 알 수 있었다. CFRC 케이블은 케이블 중심간격 및 풍향각에 관계없이 PWS 케이블에 비해 안정된 내풍성능을 보였다.
둥근어깨를 가진 대학생들에게 네발지지 운동과 벽미끄럼운동이 어깨 근활성도와 어깨 높이에 미치는 영향
박형기,양병일 대한신경치료학회 2020 신경치료 Vol.24 No.2
Purpose The purpose of this study was to investigate the effects of quadruped exercise and wall slide exercise on the shoulder height and Specific muscle activity of college students with round shoulders. Methods Participants in this study consist of 20 college students. We selected students with a height of 2.5 cm or more from the table to the back of the shoulder acromion in a straight posture(supine) as participants in the study. Participants were trained for three days a week for 4 weeks, The muscle activity of the upper trapezius, lower trapezius, and sternocleidomastoid muscle, serratus anterior were measured using the surface EMG MPl50 WSW (Surface EMG) and difference in shoulder height was measured. Results The results of this study are as follows. Comparison of shoulder height before and after exercise showed a significant decrease. Maximal voluntary isometric contraction results showed that muscle activity of the upper trapezius and sternocleidomastoid muscle was significantly decreased and muscle activity of the lower trapezius and serratus anterior was significantly increased. Conclusion The exercise of this study is effective in decreasing shoulder height of a person with a round shoulder and increasing or decreasing the activity of the shoulder muscles. It can be said that to effective effect on prevention of secondary damage to the shoulders of students and workers who live in a sitting position, or to improve the incorrect position. In future studies, systematic and specific research methods are needed and the frequency of exercise and participants should be increased.