• Physical Therapy Rehabilitation Science
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• 제10권4호
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• pp.487-492
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• 2021

Objective: This study aimed to identify the effects of assuming two types of posture (standing and kneeling) during squat exercise on lower body muscle activity. Design: Cross-sectional study Methods: Twenty-five healthy adults (18 men and 7 women) were instructed to perform the squat exercises while assuming two types of posture (standing and kneeling). EMG (Electromyography) data (% maximum voluntary isometric contraction) were recorded three times from the rectus femoris (RF), gluteus maximus (GMax), gluteus medius (GMed) and biceps femoris (BF) of participant's dominant side and the mean values were analyzed. Results: During the squat exercise with all postures, there was statistically significant difference on rectus femoris, gluteus maximus, gluteus medius, and biceps femoris muscle activity (p<0.05). The results showed that, there was significantly greater rectus femoris, gluteus medius, and biceps femoris muscle activity in standing posture than in kneeling position (p<0.05). However, the gluteus maximus muscle activity was significantly greater with kneeling posture compared to standing posture (p<0.05). Conclusions: With standing posture, it is showed that rectus femoris, gluteus medius, and biceps femoris muscle activity was greater than kneeling position. While the gluteus maximus muscle activity with standing posture was less than with kneeling posture. Therefore, it is considered that this study can be used as a selective indicator of exercise posture for strengthening specific muscle or weakness caused by paralysis.

• 대한물리치료과학회지
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• 제26권1호
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• pp.9-14
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• 2019

Background: Pes planus, or flat foot, causes lower limb malalignment and foot pain during walking or exercise. Therefore, a highly reliable evaluation method to accurately diagnose flat feet is necessary. This study investigated the intra-and inter-rater reliability of the navicular drop test in different postures. Design: Cross sectional study. Methods: Forty healthy volunteers performed the navicular drop test in three different combinations of non-weight-bearing and weight-bearing postures (standing/standing, sitting/sitting, and sitting/standing). Two examiners alternately performed the measurements five times in each subject, and in each posture. Significant differences in measurements were obtained among the three postures, with the highest navicular drop being observed in the sitting/standing posture. Results: Inter-rater reliability was high in the sitting/standing and sitting/sitting postures. Intra-rater reliability was high in all three postures. In the sitting/sitting and sitting/standing postures, large navicular drop values and high inter- and intra-rater reliability were observed. Conclusion: Therefore, the sitting/standing and sitting/sitting postures are recommended for use in navicular drop tests to diagnose flat feet.

• The Journal of Korean Physical Therapy
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• 제33권2호
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• pp.76-83
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• 2021

Purpose: This study examined the effects of applying the Pilates reformer exercise to 17 adult women on the alignment of the standing posture. Methods: The subjects performed a Pilates reformer exercise for 60 minutes a day, three times a week, for a total of eight weeks. The Pilates reformer exercise consisted of five types: 1) lower and lift, 2) hundred, 3) plow, 4) airplane, and 5) twist. The standing posture alignment in the sagittal and frontal planes was measured using exbody 9100MOMI musculoskeletal analysis equipment. Results: A comparison of before and after the exercise using paired t-test revealed a significant decrease in the difference between the horizontal inclination and the vertical height that approached zero after the intervention in the frontal plane of anterior and posterior standing postures (p<0.05), and the lateral standing posture in the sagittal plane. In addition, the difference between the horizontal inclination and the vertical height decreased and approached zero after the intervention (p<0.05). Conclusion: The Pilates reformer exercise had a positive effect on the alignment of the standing posture.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.173-173
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• 2010

This thesis identified basic design elements (Sustainable Yield, Temperature of Groundwater, Depth of Well, Separation Distance between wells) regarding installation of Standing Column Well, Geothermal Heat pump System by dynamic analysis.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.576-580
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• 2009

This thesis identified basic design elements(Sustained Yield, Depth of Well, Separation Distance between wells) regarding installation of Standing Column Well, Geothermal Heat pump System by dynamic analysis.

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 제12회 정기총회 및 01년도 동계학술발표회
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• pp.252-253
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• 2001

The purpose of this work is to investigate the dynamics of an atomic wave packet whose center-of-mass motion is quantized in a resonant standing wave cavity field. The mechanical aspect of the matter-field interaction has been extensively studied In the theme of atomic beam deflection, diffraction, or reflection by a standing-wave field. The effect caused in the behavior of spontaneous emission by the atomic center-of-mass motion, classical and quantized, in a standing wave cavity mode has been studied, and recently the one-atom laser with quantized atomic center-of-mass motion has been investigated. (omitted)

• 한국전문물리치료학회지
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• 제19권4호
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• pp.24-31
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• 2012

The aim of this study was to investigate the effectiveness of self-stretching exercises for iliotibial band (ITB) (Side-lying; right hip and knee were flexed to support the pelvis while left hip was extended and adducted, Standing A; side-bending of the trunk on standing with crossed leg, Standing B; same as Standing A, except the hands were clasped overhead and shifted right side, and Standing C; same as Standing B, except moving the arms diagonally downward) to help determine the most effective self-stretching method to stretch ITB. Twenty-one healthy subjects who do not have ITB shortness from Yonsei University (14 men and 7 women) between the ages of 18 to 28 years voluntarily participated. Ultrasound was performed to measure the thickness of the ITB between the long axis of the ITB and the level parallel to the lateral femoral epicondyle during four self-stretching exercises. All data were found to approximate a normal distribution. We used a one-way repeated-measures analysis of variance (ANOVA) to compare the thickness of the ITB among all self-stretching exercises. The level of significance was set at ${\alpha}$=.05. The ANOVA was followed by Bonferroni's correction. The overall mean of ITB thickness was $1.14{\pm}.4$ mm (${\pm}$ standard deviation) in resting status. The change in the ITB thickness in percentages between the tested position of each self-stretching exercises and resting status was significant (p<.05) (Side-lying $26.62{\pm}10.18%$ with 95% confidence interval [CI]=21.99~31.25%; Standing A $29.46{\pm}16.19%$ with 95% CI=22.09~36.84%; Standing B $44.06{\pm}14.82%$ with 95% CI=37.31~50.81%; Standing C $53.76{\pm}12.1%$ with 95% CI=48.25~59.29%). Results indicated significant differences among four self-stretching exercises except Side-lying versus Standing A (p<.01). Based on these findings, the Standing C self-stretching exercise was the most effective in stretching the ITB thickness among four types of ITB self-stretching exercises. Additionally, the Side-lying self-stretching exercise using gravity to stretch the ITB is recommended as a low-load (low-intensity), long-duration stretch.

• 경영과정보연구
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• 제38권3호
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• pp.35-53
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• 2019

감사기구는 조직 내에서 감시와 통제 활동을 통해 전문경영인의 기회주의적인 의사결정과 행위를 줄여 주는 기능을 수행하는 내부통제 메커니즘으로서의 높은 독립성이 요구된다. 본 연구는 기업의 소유구조 상의 특성들이 상근감사의 독립성에 미치는 영향을 분석하는데 주된 목적을 두고 실행되었다. 그리고 이 같은 목적을 달성하기 위하여 상근감사의 독립성을 전문경영인과의 학연과 출신기업을 기준으로 산출한 후 전문경영인의 지분율이 독립적인 상근감사의 선임에 미치는 영향을 분석하였으며, 내부대주주인 특수관계인과 외부대주주인 기관투자자 및 외국인투자자의 지분율이 이 같은 관계에 미치는 조절효과를 분석하였다. 분석결과에 따르면 전문경영인의 지분율과 상근감사의 독립성은 부(-)의 관계가 있으며, 특수관계인의 지분율은 이 같은 관계를 정(＋)의 방향으로 조절하는 것으로 나타났으나, 외국인투자자와 기관투자자 지분율의 조절효과는 통계적으로 유의하지 않았다. 이러한 연구 결과는 전문경영인은 자신의 지분율이 높아 질수록 강화된 권한을 활용하여 독립성이 낮은 상근감사를 선임하려고 시도하는 반면, 특수관계인들은 자신들의 부를 보호하는데 도움이 되는 독립성이 높은 상근감사를 선임하고자 한다는 사실을 보여주고 있다. 본 연구는 기업의 소유구조 상의 특성들이 독립적인 상근감사의 선임에 미치는 영향을 분석한 첫 번째 연구로서, 분석결과는 전문경영인과 소유구조 상의 특성에 따른 상근감사 선임기준에 대한 실무적 가이드라인을 제공하고 있다.

• 대한전자공학회논문지SD
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• 제37권3호
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• pp.14-19
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• 2000

Seed crystal 로 bare (0001) 사파이어 기판을 사용하여 hydride vapor Phase epitaxy (HVPE)법을 이용하여 free-standing GaN 단결정기판을 성장시켰다. 일정한 두께의 GaN막을 성장한 후 사파이어 기판을 mechanical polishing 작업으로 제거하여 두께 200 ㎛, 10×10 ㎛ 크기의 free-standing GaN 기판을 얻을 수 있었으며, 성장 전 GaCl 전처리를 수행함으로써 crack이 없는 기판을 제작할 수 있었다. 이렇게 제작된 free-standing GaN 기판의 특성을 SiO/sub 2/ patterned sapphire위에 LEO (Lateral Epitaxial Overgrowth) 방법으로 성장된GaN박막과 double crystal x-ray diffraction (DC-XRD), cathode-luminescence (CL) 및 photoluminescence (PL) 방법으로 특성을 비교하였다.

• 한국전문물리치료학회지
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• 제27권4호
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• pp.241-249
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• 2020

Background: Prolonged standing during work causes a lower extremity pain and disorders. Patellofemoral pain syndrome (PFPS) is one of the common diagnoses of the knee pain. Although the etiology of PFPS is not completely understood, it is considered to be multifactorial. Objects: The purpose of this study was to investigate difference in strength of knee muscles, quadriceps:hamstring muscles strength ratio (Q:H ratio), asymmetry ratio of knee muscles strength and dorsiflexion range of motion (ROM) between standing workers with and without PFPS. Methods: Twenty-eight standing workers with PFPS and 26 age-, height-, and weight-matched standing workers without PFPS participated in this study. A tension sensor measured knee muscle strength, and motion sensor measured dorsiflexion ROM. The asymmetry ratio of knee muscles was calculated by a specific formula using the knee muscles strength of the dominant side and the sound side. An independent t-test was used to identify significant differences in the strength, ROM, Q:H ratio, and asymmetry ratio between the PFPS and normal groups. Results: The standing worker with PFPS have significantly lower dorsiflexion ROM (p < 0.000) and higher asymmetry ratio of the hamstring muscles strength (p < 0.000) compare to the standing worker without PFPS. No significant differences were seen in the strength of quadriceps muscle and hamstring muscles, Q:H ratio, and asymmetry ratio of quadriceps muscle strength. Conclusion: There was a significant difference in the asymmetry ratio of the isometric hamstring muscle strength. This finding suggests that the asymmetry ratio of isometric hamstring muscle strength may be more important than measuring only the hamstring muscle strength of the PFPS side. Furthermore, the results of this study showed a significant difference in dorsiflexion ROM between the standing industrial workers with and without PFPS. Dorsiflexion ROM and isometric hamstring muscle strength should be considered when evaluating the subjects with PFPS.