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태권도 숙련자와 비숙련자의 앞발 돌려차기 동작에 대한 운동학적 요인과 지면반력 비교분석
박진서(Park, Jin-Seo),오정환(Oh, Cheong-Hwan),홍수영(Hong, Soo-Young),신의수(Shin, Eui-Su),송동호(Song, Dong-Ho) 한국사회체육학회 2016 한국사회체육학회지 Vol.0 No.63
The purpose of this study is to identify the time duration, position of center of mass and velocity, the angle of body segmentation and angular velocity, and analyze the surface reaction to understand how force is exerted and the physical segmentation movements happen. The findings were as follows. First, the total time it took for the Forefoot dollyeo chagi was for experienced performers 0.29±0.02 s, and 0.31±0.01 s for inexperienced performers, with a significant difference. Second, when performing a Forefoot dollyeo chagi, the position of center of mass on the left and right were both towards the right for experienced and inexperienced performers. In terms of front and back, the center of mass moved towards the front. In terms of vertical position of center of mass, there was a movement up wards but there was no significant difference. Third, in terms of the foot velocity of the kicking feet, the velocity was highest at phase 3. There were significant differences in phase 3 and phase 4. Fourth, the hip joint of the side of the kicking leg showed a curve in both experienced and inexperienced performers. The angle of the knee joint was curved up to phas3e but in phase 4 it was extended. The ankle joint of the kicking leg showed a low curve as the kicking progressed in experienced performers, but in inexperienced performers, dorsiflexion appeared upon impact, but with no significant difference. Fifth, there was no significant difference in the angle velocity of the hip joint and the ankle joint for both experienced and inexperienced performers, but the angle velocity of the knee joint showed significant difference upon impact of the kicking leg and the supporting leg. Sixth, there was no significant difference in the ground reactive force of left and right and vertical ground reactive force for experienced and inexperienced performers, but the front and back ground reaction force was big in phase 1 for experienced performers with significant difference. The study’s findings indicate that in order to reduce the time it takes to perform a Forefoot dollyeo chagi, it is efficient to reduce the time during the preparation stage. To do this, training to make the segmentation movements from the close location to the far location would be needed. In addition, during the early phases of the kicking, the segmentation of the hip and a quick curving of the trunk would be more favorable for quick movements. Therefore, the fast angle velocity of the hip joint during the preparation phase can be seen as an important factor to perform a quick kick.
최경식(Kyung Shik Choi),송동수(Dong Su Song),박신열(Shin Yeol Park),이경수(Kyung Su Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
주상변압기의 고장 요인으로 절연파괴가 많은 부분 차지하고 있으며 절연파괴 원인으로 변압기 부싱 개스킷을 통한 수분침투와 절연유 누유가 주 원인이 다 수분침투와 절연유 누유의 주 원인은 개스킷 재질의 열화이며 변압기의 설계수명까지 개스킷의 건정성을 유지하기 위해 열화에 강한 개스킷 재질 선정이 중요하다 열화에 강한 고무재질을 평가하기위해 현재 규격에서 정하고있는 NBR과 대체 가능 재질인 HNBR에 대해 가속열화 수명시험을 하였으며 Arrhenius plot 방식에의 한 활성화 에너지는 NBR과 HNBR이 89.0 kj/mole 84.4 kj/mole로 나타났으며 변압기 사용 온도에서 NBR, HNBR 수명을 평가하였다.
정부기술개발사업 과제기획과정에 있어 산업분석의 역할과 의미
김봉균(Kim BongGyun),박송동(Park Song Dong) 한국기술혁신학회 2010 기술혁신학회지 Vol.13 No.3
본 연구는 에너지기술개발사업의 과제 기획 결과 자료를 활용하여 정부의 기술개발사업의 과제 기획 과정에서 산업분석이 지원 대상 기술 개발 과제 선정에 미치는 영향과 의미를 알아보고, 효과적인 산업분석 방안을 제안하였다. 실증 분석 결과, 기획 과제 선정에서는 R&D 효율성과 R&D 지원 필요성이 감안되고 있는 것으로 분석되어 기획 과제의 선정 과정에서 산업의 요구를 상당히 반영되고 있었다. 그러나 Supply Chain 공백 정도나 Supply Chain 완성 기여도, 그리고 대외수지 개선 기여도는 과제선정에 잘 반영되지 못하였다. 즉, 지속적인 대외 교역 수지 개선과 에너지 산업의 수입 의존적 발전의 개선 필요성이 높음에도 불구하고 기획 과제의 선정 과정에서는 해당 기획 과제가 소속된 Supply Chain의 완성 상태에 대한 고려와 수입 대체 및 수출 산업화에 대한 고려가 부족하였다. 따라서 정부기술개발사업에서는 R&D 지원이 보다 효율화될 수 있도록 보다 세밀한 산업 분석을 통해 산업의 R&D 수요를 정확히 파악하고 그 R&D 수요를 잘 충족시킬 수 있도록 기술 개발 기획이 이루어질 필요가 있으며, 더욱 체계화된 Supply chain 분석과 활용이 필요한 것으로 나타났다. The aim of this study were to investigate the process of national R&D project planning by using the industry quantitative analysis(especially supply-chain enterprise ananlysis). In the selection process of funding project, the role and significance of the industry analysis can be identified as the effective guideline of using this methodology. Across the study, the following is noted : the factors of R&D effectiveness and R&D necessity are found reliable and valid. On the other hand, the emptiness of supply chain and the positive effect of foreign trade balance did not influence the selection of project. The information gained from this study will help us to define better expectations and industry analysis employing to the National R&D Project Planning.
기경도 ( Kyung Do Ki ),변재용 ( Jae Yong Byun ),김상훈 ( Sang Hoon Kim ),송동화 ( Dong Wha Song ),권기환 ( Kee Hwan Kwon ),박문서 ( Moon Suh Park ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.4
Objective: Although Bell`s palsy is not common in pregnancy, it is more prevalent among pregnant women than among non-pregnant women. Since the exact clinical characteristics of this condition are not fully understood, we evaluated the epidemiology, pathophysiology, onset time, as well as the recovery rate according to treatment modality of Bell`s palsy in pregnancy, and compared them to those of the non-pregnant population in this study. Methods: Between March 1996 and February 2006, we identified 43 patients who suffered from Bell`s palsy during pregnancy and postpartum with a minimum 6 month follow up at Kyung Hee University Hospital. We conducted retrospective medical records analysis and compared them to similary chosen Bell`s palsy case in non pregnant women who were matched for age. Results: The median gestational age at the onset of Bell`s palsy was 32 weeks. Among the 43 patients who had been diagnosed with Bell`s palsy in pregnancy, 81.4% (35 of 43) showed a satisfactory outcome. Among the 36 patients with complete palsy, 77.8% (28 of 36) showed a satisfactory recovery. Recovery rate according to treatment modality in pregnant patients with Bell`s palsy were 28/35 (80.0%) in the acupuncture group, 3/3 (100%) in the steroid therapy group, and 4/5 (80.0%) in the combined acupuncture and steroid therapy group, respectively. Conclusion: We did not detect any difference in clinical characteristics of Bell`s palsy in the pregnant group compared with the non-pregnant group. Further study will be needed to select the method of treatment for Bell`s palsy in pregnant women.