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균형 경사형 신발이 임산부의 보행과 족저압에 미치는 효과
장석일 ( Suck Il Jang ),이유리 ( Yu Ri Lee ),곽형심 ( Hyung Sim Kwak ),문광섭 ( Kwang Sup Moon ),신종철 ( Jong Chul Shin ),김장흡 ( Jang Heub Kim ) 대한산부인과학회 2010 Obstetrics & Gynecology Science Vol.53 No.11
목적: 본 연구는 균형 경사형 신발이 임산부의 안정된 보행, 피로 감소, 혈액순환 개선, 그리고 발 관련 질병에 미치는 효과를 조사하였다. 연구 방법: 병력이 없는 임신 7~9개월의 임산부 7명과 출산 후 3개월 이내의 산모 3명을 대상으로 각각 평면형 신발과 균형 경사형 신발을 착용하고 보행 실험을 실시하였다. 3차원 동작분석, 족저압력측정, 그리고 혈류속도에 대한 두 가지 보행 조건하의 실험이 통계적으로 조사되었고, 일원분산분석 방식의 통계방법을 사용하였다. 결과: 10명의 피험자 중 오류 데이터를 제외한 9명에 대하여 보행 시 균형 경사형 신발이 평면형 신발에 비해 평균 6 mm 정도 무릎을 안쪽으로 모아주어 신발에 따른 무릎 사이 거리의 변화 특성에 유의한 차이가 있었다(P < 0.05). 균형 경사형 신발이 평면형 신발에 비해 전체적인 압력의 크기를 15% 정도 감소시켜 주고, 발꿈치에 집중되었던 압력이 발바닥 홈 외측 부위로 분산되어 압력 분포 특성에서도 유의한 차이가 있었다(P < 0.05). 혈류속도는 9명의 피험자 전체가 착화 전에는 C (200~400 μm/sec)나 D (100~200 μm/sec) 구간에 속하였지만 균형 경사형 신발을 착용한 후에는 A (> 600 μm/sec)와 B (400~600 μm/sec)구간으로 1~2구간 개선되는 경향이 있었다. 결론: 균형 경사형 신발은 자세를 바르게 하고, 보행자세를 안정화시키고, 과도한 발목의 부하를 줄이고, 피로를 감소시키며, 혈액순환을 개선하는 효과를 나타내었다. Objective: This study investigated the effects of the balanced incline shoes on the stabilized walking, fatigue reduction, improvement of blood circulation and prevention of foot related disease for the pregnant women. Methods: The seven 7~9 month pregnant women and three maternities within 3 months after delivery without a history of disease performed the cycles for each of the two walking conditions: wearing balanced incline shoes and flat shoes. The differences between the two walking conditions were statistically investigated including three dimensional motion analysis, footprint pressures and blood flow. To find out any possible difference between these two kinds and among the subjects, the statistical tool was utilized with one-way layout design. Results: Of 10 subjects, seven subjects showed the significantly decreased in distance of both knee with balanced incline shoes than flat shoes (P<0.05). Those with the balanced incline shoes had a walking pattern whose knee moved inward about 6 mm, compared to those with the flat regular ones. Over plantar pressure measurements for all ten, it also revealed statistically significant differences that the balanced incline shoes decreased its pressure 15% and that the pressure heavily on heel area was distributed outward along the arch (P<0.05). The blood stream velocity belonged to C (200~300 μm/sec) or D (100~200 μm/sec) for the nine before wearing the balanced incline shoes. However, it was found to be enhanced in A (>600 μm/sec) or B (400~600 μm/sec) after they put them on, indicating 1~2 part equivalent improvement. The blood stream velocity showed a incremental tendency after wearing balanced incline shoes. Conclusion: This result suggests that the balanced incline shoes corrected the postures, stabilized the gait pattern, decreased the excessive load on ankle plantar flexors, reduced the fatigue level and improved the blood circulation.
장광석(Kwang-Seok Jang),심기철(Ki-Chul Sim),이재욱(Jae-Uk Lee),이홍표(Hong-Pyo Lee),조명석(Myung-Suk Cho) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
The purpose of this study is to reduce the quantities of the isolators for optimization of nuclear power plants base isolation system. To solve this problem, increase the horizontal stiffness of the device over the performance improvement of the existing low hardness rubber, and decreases the quantity of devices through the division of lead-core. In order to optimize the APR1400’s base isolation system, finite element analysis was performed to examine the multi-lead rubber bearing which is improved the single lead rubber bearing. The proposed division of lead plug can reduce the quantity of devices through in this study. Accordingly possible to secure economic efficiency of the seismic isolation system, and is also expected to be effectively managed in the maintenance.
신분당선 CBTC구간과 분당선 ATC구간의 절체운전에 대한 고찰
장광동(Jang Kwang-Dong),차기주(Cha Ki-Ju),강덕원(Kang Deok-Won),이종성(Lee Jong-Seong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
Sinbundang Line (SBL) Train moves the transition zone where is located between Jeongja station and Migeum station switched over from Communication Based Train Control (CBTC) system area to Automatic Train Control (ATC) system area and viceversa. The SBL train to move the between SBL and Bundang Line is needed to install the Specific Transmission Module (STM) on SBL Line for interface with Bundang Line; STM receives from speed code from Bundang Line. So we suggested the method to ensure mutual compatibility and reliability for train operation on each other signaling system.